Patent Publication Number: US-2023150210-A1

Title: Fiber-reinforced resin material, molded article, method and device for manufacturing fiber-reinforced resin material, and fiber bundle group inspection device

Description:
TECHNICAL FIELD 
     The present invention relates to a fiber-reinforced resin material, a molded article, a method and device for manufacturing a fiber-reinforced resin material, and a fiber bundle group inspection device. 
    
    
     This application is a Divisional of U.S. Application Serial No. 16/374,875 filed Apr. 4, 2019, allowed, which is a Divsional of U.S. Application Serial No. 15/738,380, filed Dec. 20, 2017, now U.S. Pat. no. 10,343,352; which is a 371 of PCT/JP2016/068862, filed Jun. 24, 2016, the disclosures of which are incorporated herein by reference in their entireties. This application is based upon and claims the benefit of priority from Japanese Patent Application No. 2015-126814 filed on Jun. 24, 2015, Japanese Patent Application No. 2015-160158 filed on Aug. 14, 2015, and Japanese Patent Application No. 2015-252244 filed on Dec. 24, 2015 in the Japanese Patent Office, the entire contents of which are hereby incorporated by reference. 
    
    
     BACKGROUND ART 
     SMC (Sheet Molding Compound) and stampable sheets are known as molding materials which are excellent in mechanical properties of molded articles and suitable for forming complex shapes such as three-dimensional shapes. The SMC is a sheet-shaped fiber-reinforced resin material obtained, for example, by impregnating a thermosetting resin such as an unsaturated polyester resin between fiber bundles obtained by cutting reinforced fibers such as glass fibers and carbon fibers. In addition, the stampable sheet is a sheet-shaped fiber-reinforced resin material obtained, for example, by impregnating a thermoplastic resin into the above-described cut fiber bundle. 
     The SMC is an intermediate material for obtaining molded articles. When molding the SMC, compressing (pressing) the SMC with heating using a mold is used. At this time, the fiber bundle and the thermosetting resin are filled into the cavity of the mold while flowing together, and after that, the thermosetting resin is cured. Therefore, by using the SMC, it is possible to obtain molded articles of various shapes such as those having partially different thicknesses, those having ribs, bosses, or the like. In addition, molded articles of the stampable sheet can be obtained by heating up to the melting point or more of a thermoplastic resin by an infrared heater or the like and cooling and pressing with a mold at a predetermined temperature. 
     In manufacturing the above-described SMC (fiber-reinforced resin material), a paste containing a thermosetting resin is applied on a sheet (carrier) to be conveyed, after that, an elongated fiber bundle is cut into predetermined-length fiber bundles, and the predetermined-length fiber bundles are scattered on the paste (refer to, for example, Patent Literature 1). 
     However, according to the manufacturing method in the related art, the directions of the fiber bundles scattered on the paste tend to be aligned in a certain direction, and thus, directionality may occur in the strength of the manufactured SMC. Specifically, the fiber bundles that are cut by the cutting machine and dropped tend to collapse in the conveying direction of the sheet when landing on the conveyed sheet and tend to be aligned in the direction along the conveying direction of the sheet. In addition, as the length of the cut fiber bundles becomes longer or the conveying speed of the sheet becomes faster, this tendency appears more remarkably. 
     Therefore, in the SMC obtained by the manufacturing method in the related art, the strength thereof is increased in the conveying direction (longitudinal direction) of the sheet, and the directionality easily occurs such that the strength thereof becomes weaker in the direction (width direction) perpendicular to the conveying direction of the sheet. Therefore, in manufacturing the SMC, it is necessary to allow the directions of the fiber bundles scattered on the paste to be irregular (random) so that no directionality occurs in the strength of the SMC as described above. For example, although the directionality of this strength can be reduced by decreasing the conveying speed of the sheet, in this case, the productivity of the SMC is deteriorated. The same description is also applied to the case of the stampable sheet. 
     As a measure for allowing the orientations of the fiber bundles to be irregular, in the following Patent Literature 1, a method of uniformly dispersing the fiber bundles without directionality by tapping fiber bundles that are cut by a cutting machine and dropped with a rotating drum has been disclosed. However, when this method is used, fluff (fiber scrap) is generated from the fiber bundles tapped with the rotating drum. In particular, since the fiber bundles are loosened, the more the rotation speed of the rotating drum is increased, the more fluff occurs. In addition, a drive source for rotationally driving the rotating drum is required. 
     CITATION LIST 
     Patent Literature 
     Patent Literature 1: JP 2000-17557 A 
     SUMMARY OF THE INVENTION 
     Problem to Be Solved by the Invention 
     The invention has been proposed in view of such circumstances in the related art, and an object of the invention is to provide a fiber-reinforced resin material and a molded article which are less oriented in strength and superior in productivity. 
     Another object of the invention is to provide a method and device for manufacturing a fiber-reinforced resin material capable of uniformly dispersing the cut fiber bundles without directionality when manufacturing a sheet-shaped fiber-reinforced resin material impregnated with a thermosetting resin or a thermoplastic resin between cut fiber bundles and a fiber bundle group inspection device which can be used for stably and continuously manufacturing the fiber-reinforced resin material as described above. 
     Means for Solving Problem 
     In order to achieve the above object, the invention provides the following means. 
     A sheet-shaped fiber-reinforced resin material impregnated with a resin between dispersed fiber bundles, in which a diffracted X-ray at a diffraction angle 20 of 25.4° is detected by an X-ray diffraction method, and a roughness β obtained by the following Mathematical Formulas (1) to (3) is in a range of 0.5 to 4.5. 
     
       
         
           
             
               
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     In the above Mathematical Formula, f(ϕ i ) is a luminance obtained by subtracting an average luminance from a luminance (I(ϕ i )) of an i-th rotation angle (ϕ i ) in X-ray diffraction measurement represented by the following Mathematical Formula (2), and dϕ is a step width of the X-ray diffraction measurement. I(ϕ i ) is normalized so that an integration strength represented by the following Mathematical Formula (3) becomes 10000. 
     
       
         
           
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     [2] A sheet-shaped fiber-reinforced resin material impregnated with a resin between dispersed fiber bundles, 
     in which, when a longitudinal direction of the fiber-reinforced resin material is defined as a 0° direction and a width direction is defined as a 90° direction, a diffracted X-ray at a diffraction angle 2θ of 25.4° is detected by an X-ray diffraction method, and a sum of an average value and a standard deviation of a degree of crystal orientation f a  of the fiber bundle based on the 0° direction obtained by the following Mathematical Formulas (4) to (6) is in a range of 0.05 to 0.13. 
     
       
         
           
             
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     In Mathematical Formula (4), “a” is an orientation coefficient represented by Mathematical Formula (5). I(ϕ i ) is a luminance at an i-th rotation angle (ϕ i ) in X-ray diffraction measurement and is normalized so that an integration strength represented by Mathematical Formula (6) becomes 10000. 
     The fiber-reinforced resin material according to [1] or [2], in which the resin is a thermosetting resin. 
     A molded article of the fiber-reinforced resin material according to any one of [1] to [3],
     in which, when a longitudinal direction of the molded article is defined as a 0° direction and a width direction is defined as a 90° direction,   a ratio (0° bending modulus of elasticity/90° bending modulus of elasticity) of flexural moduli [GPa] of the respective directions is in a range of 0.8 to 1.2, and   coefficients of variation (CV) (CV of 0° bending modulus of elasticity and CV of 90° bending modulus of elasticity) [%] of the bending moduli of elasticity in the respective directions are all in a range of 5 to 15.   

     A method for manufacturing a sheet-shaped fiber-reinforced resin material impregnated with a resin between cut fiber bundles, including:
     a coating step of coating a first sheet conveyed in a predetermined direction with the resin;   a cutting step of cutting an elongated fiber bundle with a cutting machine,   a scattering step of dispersing cut fiber bundles and scattering the fiber bundles on the resin; and   an impregnating step of pressing a scattered fiber bundle group and the resin on the first sheet to impregnate the resin between the fiber bundles.   

     The method for manufacturing a fiber-reinforced resin material according to [5], in which the impregnating step is a step of overlaying a second sheet coated with the resin on a first sheet on which the fiber bundles have been dispersed, after that, pressing the resin and the fiber bundle group interposed between the first sheet and the second sheet to impregnate the resin between the fiber bundles. 
     The method for manufacturing a fiber-reinforced resin material according to [5] or [6], in which the coating step is a step of coating the first sheet with a paste containing a thermosetting resin. 
     The method for manufacturing a fiber-reinforced resin material according to any one of [5] to [7], in which the scattering step is a step of arranging a plurality of rods side by side under the cutting machine and dropping cut fiber bundles toward the plurality of rods to disperse the fiber bundles to scatter the fiber bundles on the resin. 
     The method for manufacturing a fiber-reinforced resin material according to [8], in which rods extending in a conveying direction of the first sheet are used as the plurality of rods. 
     The method for manufacturing a fiber-reinforced resin material according to any one of [5] to [9], further including an inspecting step of inspecting a fiber orientation state of the fiber bundle group scattered on the resin. 
     The method for manufacturing a fiber-reinforced resin material according to [10], in which the inspecting step includes:
     an imaging step of separately irradiating the fiber bundle group with first light and second light obliquely from an upper side in directions intersecting with each other as viewed in a plan view and capturing a still image of an upper surface of the fiber bundle group at a state of being irradiated with the first light or the second light; and   an orientation determining step of calculating a luminance difference or a luminance ratio between a luminance in the state of being irradiated with the first light and a luminance in the state of being irradiated with the second light and determining the fiber orientation state of the fiber bundle group on the basis of luminance information obtained from the still image captured in the imaging step.   

     The method for manufacturing a fiber-reinforced resin material according to [10] or [11], further including a control step of changing a condition of the scattering step on the basis of an inspection result of the inspecting step to control the fiber orientation state of the fiber bundle group. 
     The method for manufacturing a fiber-reinforced resin material according to [12], in which, in the control step, the fiber orientation state of the fiber bundle group is controlled by changing a conveying speed of the first sheet on the basis of the inspection result of the inspecting step. 
     The method for manufacturing a fiber-reinforced resin material according to [12] or [13],
     in which the scattering step is a step of using the plurality of rods, and   in which, in the control step, the fiber orientation state of the fiber bundle group is controlled by changing an inclination angle of the plurality of rods with respect to a horizontal direction on the basis of the inspection result of the inspecting step.   

     The method for manufacturing a fiber-reinforced resin material according to [12] or [14],
     in which the scattering step is a step using the plurality of rods, and   in which, in the control step, the fiber orientation state of the fiber bundle group is controlled by changing a frequency of the plurality of rods on the basis of the inspection result of the inspecting step.   

     A device for manufacturing a sheet-shaped fiber-reinforced resin material impregnated with a resin between cut fiber bundles, including:
     a coating unit which coats a first sheet conveyed in a predetermined direction with the resin;   a cutting unit which cuts an elongated fiber bundle with a cutting machine;   a scattering unit which disperses cut fiber bundles and scatters the fiber bundles on the resin; and   an impregnation unit which presses a scattered fiber bundle group and the resin on the first sheet to impregnate the resin between the fiber bundles.   

     The device for manufacturing a fiber-reinforced resin material according to [16], in which the impregnation unit is an impregnation unit which overlays a second sheet coated with the resin on a first sheet on which the fiber bundles have been dispersed, after that, presses the resin and the fiber bundle group interposed between the first sheet and the second sheet to impregnate the resin between the fiber bundles. 
     The device for manufacturing a fiber-reinforced resin material according to [16] or [17], in which the scattering unit is a scattering unit which arranges a plurality of rods side by side under the cutting machine and drops cut fiber bundles toward the plurality of rods to disperse the fiber bundles. 
     The device for manufacturing a fiber-reinforced resin material according to [18], in which the plurality of rods are rods extending in a conveying direction of the first sheet. 
     A fiber bundle group inspection device comprising:
     a first light irradiation means and a second light irradiation means which irradiate a fiber bundle group configured with a plurality of fiber bundles scattered continuously on a belt-shaped resin running in one direction with light obliquely from an upper side in directions intersecting each other as viewed in a plan view;   an imaging means which is provided above the fiber bundle group and captures a still image of an upper surface of the fiber bundle group in a state of being irradiated with light by the first light irradiation means or the second light irradiation means; and   an orientation determination means which calculates a luminance difference or a luminance ratio between a luminance in the state of being irradiated with light by the first light irradiation means and a luminance in the state of being irradiated with light by the second light irradiation means on the basis of luminance information obtained from the still image captured by the imaging means and determines a fiber orientation state of the fiber bundle group.   

     Effect of the Invention 
     As described above, the fiber-reinforced resin material and the molded article according to the invention have small directionality of strength and excellent productivity and can be appropriately used particularly as an SMC. In addition, according to the method and device for manufacturing a fiber-reinforced resin material according to the invention, it is possible to increase the proportion of the fiber bundles that collapse in directions different from the conveying direction of the first sheet among the fiber bundles that are cut by the cutting machine and scattered on the resin. Therefore, it is possible to uniformly disperse the fiber bundles without directionality while suppressing generation of fluff (fiber scraps) from the fiber bundle. As a result, it is possible to maintain the strength of the fiber-reinforced resin material to be manufactured more uniform in all directions. In addition, by using the fiber bundle group inspection device according to the invention, it is possible to manufacture a fiber-reinforced resin material while inspecting the fiber orientation state of the fiber bundle group on the production line, so that it is possible to maintain the strength of the fiber-reinforced resin material to be manufactured more stable and uniform in the direction. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG.  1    is a side view illustrating a configuration of a device for manufacturing a fiber-reinforced resin material according to an embodiment of the invention; 
         FIG.  2    is an enlarged side view illustrating a cutting unit of the device for manufacturing a fiber-reinforced resin material illustrated in  FIG.  1   ; 
         FIG.  3    is a plan view of a plurality of rods arranged in the cutting unit illustrated in  FIG.  2   ; 
         FIG.  4 A  is a cross-sectional view illustrating the cross-sectional shape of the rod illustrated in  FIG.  3   ; 
         FIG.  4 B  is a cross-sectional view illustrating another example of the cross-sectional shape of the rod; 
         FIG.  4 C  is a cross-sectional view illustrating still another example of the cross-sectional shape of the rod; 
         FIG.  5 A  is a plan view schematically illustrating a behavior of fiber bundles in contact with rods; 
         FIG.  5 B  is a front view schematically illustrating a behavior of fiber bundles in contact with the rods; 
         FIG.  5 C  is a side view schematically illustrating a behavior of fiber bundles in contact with the rods; 
         FIG.  6    is a side view illustrating a configuration where the rods are arranged in an inclined state; 
         FIG.  7 A  is a plan view schematically illustrating an operation of vibrating the rods; 
         FIG.  7 B  is a side view schematically illustrating the operation of vibrating the rods; 
         FIG.  8    is a plan view illustrating a structure where each rod is supported at both ends; 
         FIG.  9    is a side view illustrating a configuration where rods are arranged with spaces in a height direction; 
         FIG.  10    is a perspective view illustrating an example of an inspection device for a fiber bundle group according to the invention; 
         FIG.  11    is a plan view of the inspection device of  FIG.  10   ; 
         FIG.  12    is a side view of the inspection device of  FIG.  10    as viewed from a second irradiation unit side of the resin and fiber bundle group; 
         FIG.  13    is a side view of the inspection device of  FIG.  10    as viewed from a fourth irradiation unit side of the resin and fiber bundle group; 
         FIG.  14 A  is a schematic view illustrating a state where light is reflected on a surface of a fiber bundle and is a view illustrating a case where a fiber axis direction and a light running direction are perpendicular to each other as viewed in a plan view; 
         FIG.  14 B  is a schematic view illustrating a state where light is reflected on a surface of a fiber bundle and is a view illustrating a case where a fiber axis direction and a light running direction are parallel to each other as viewed in a plan view; 
         FIG.  15    is a side view illustrating an example of a device for manufacturing a fiber-reinforced resin material according to one embodiment of the invention; 
         FIG.  16    is a side view illustrating the inclination angle of the rod in the manufacturing device of  FIG.  15   ; 
         FIG.  17    is a graph illustrating measurement results in Example 1; 
         FIG.  18    is a graph illustrating measurement results in Example 2; 
         FIG.  19    is a plan view illustrating an arrangement of test pieces cut out from molded articles of SMC in Example 2; 
         FIG.  20 A  is a plan view illustrating an arrangement of test pieces cut out from molded articles of SMC in Example 3; 
         FIG.  20 B  is a plan view illustrating an arrangement of test pieces cut out from molded articles of SMC in Example 3; 
         FIG.  21    is a plan view illustrating a test piece used in a tensile test in Example 3; 
         FIG.  22    is a graph illustrating a relationship between an angle of a fiber axis of a fiber bundle and luminance in Experimental Example A1; and 
         FIG.  23    is a graph illustrating a relationship between a running speed (conveyor speed) of the first resin sheet and a luminance ratio in Example A1. 
     
    
    
     MODE(S) FOR CARRYING OUT THE INVENTION 
     Hereinafter, embodiments according to the invention will be described in detail with reference to the drawings. 
     In addition, in the drawings used in the following description, for the better understanding of features, there are cases where feature portions are enlarged for the sake of convenience, and the dimensional ratio of each component may not be the same as the actual one. In addition, materials, dimensions, and the like exemplified in the following description are merely examples, and the invention is not necessarily limited thereto, and appropriate changes and modifications are available within the scope without changing the spirit thereof. 
     The device and method for manufacturing a fiber-reinforced resin material according to the invention are configured to manufacture a sheet-shaped fiber-reinforced resin material impregnated with a resin between cut fiber bundles. The fiber-reinforced resin material obtained in the invention can be appropriately used as an SMC or a stampable sheet. 
     A fiber bundle is a bundle of a plurality of reinforced fibers. The reinforced fiber is preferably a carbon fiber. In addition, the reinforced fibers are not limited to carbon fibers, and reinforced fibers other than carbon fibers such as glass fibers may be used. 
     As a resin, a thermosetting resin or a thermoplastic resin may be used. As a resin, only a thermosetting resin may be used, or only a thermoplastic resin may be used, and both a thermosetting resin and a thermoplastic resin may be used. In the case where the fiber-reinforced resin material according to the embodiment is used as an SMC, a thermosetting resin is preferable as the resin. In the case where the fiber-reinforced resin material according to the embodiment is used as a stampable sheet, a thermoplastic resin is preferable as the resin. 
     As the thermosetting resin, there may be exemplified an unsaturated polyester resin, an epoxy resin, a vinyl ester resin, a phenol resin, an epoxy acrylate resin, a urethane acrylate resin, a phenoxy resin, an alkyd resin, a urethane resin, a maleimide resin, a cyanate resin, and the like. As the thermosetting resin, one type may be used alone, or two or more types may be used in combination. 
     As the thermoplastic resin, there may be exemplified a polyolefin resin, a polyamide resin, a polyester resin, a polyphenylene sulfide resin, a polyether ketone resin, a polyether sulfone resin, an aromatic polyamide resin, and the like. As the thermoplastic resin, one type may be used alone, or two or more types may be used in combination. 
     First Embodiment 
     Hereinafter, a first embodiment of the invention will be described. 
     Device for Manufacturing Fiber-Reinforced Resin Material 
     As an example of a device for manufacturing a fiber-reinforced resin material according to the first embodiment, a case of manufacturing a sheet-shaped SMC impregnated with a paste containing a thermosetting resin such as an unsaturated polyester resin between fiber bundles obtained by cutting an elongated fiber bundle made of carbon fibers will be described. 
       FIG.  1    is a side view illustrating a configuration of a device for manufacturing a fiber-reinforced resin material according to the embodiment. In addition, in the following description, an XYZ rectangular coordinate system is set, and a positional relationship of each member will be described with reference to the XYZ rectangular coordinate system. 
     As illustrated in  FIG.  1   , the device for manufacturing a fiber-reinforced resin material  11  according to the embodiment (hereinafter, simply referred to as the manufacturing device  11 ) is configured to include a fiber bundle supply unit  110 , a first sheet supply unit  111 , a first coating unit  112 , a cutting unit  113 , a scattering unit  142 , a second sheet supply unit  114 , a second coating unit  115 , and an impregnation unit  116 . 
     While drawing out fiber bundles CF configured with elongated carbon fibers from a plurality of bobbins  117 , the fiber bundle supply unit  110  forms one fiber bundle CF through a plurality of guide rollers  118  and supplies the fiber bundle CF to the cutting unit  113 . 
     The first sheet supply unit  111  supplies an elongated first sheet (carrier sheet) S 11  unwound from the first raw fabric roll R 11  toward the first coating unit  112 . The manufacturing device  11  is configured to include a first conveying unit  119  that conveys the first sheet S 11  in a predetermined direction (+X axis direction) (hereinafter, referred to as a conveying direction). 
     The first conveying unit  119  is configured to include a guide roller  120  and a conveyor  123  in which an endless belt  122  is hung between a pair of pulleys  121   a  and  121   b . While rotating, the guide roller  120  guides the first sheet S 11  supplied from the first sheet supply unit  111  toward the conveyor  123 . While rotating the endless belt  122  by rotating the pair of pulleys  121   a  and  121   b  in the same direction, the conveyor  123  moves the first sheet S 11  on the surface of the endless belt  122  in the +X axis direction (toward the right side in the horizontal direction). 
     The first coating unit  112  is located immediately above the one pulley  121   a  close to the guide roller  120  and is provided with a supply box  124  for supplying a paste P 1  containing a thermosetting resin. The supply box  124  coats the surface of the first sheet S 11  conveyed by the conveyor  123  with the paste P 1  having a predetermined thickness from a slit (not shown) formed on the bottom surface thereof. 
     In addition, besides the thermosetting resin such as an unsaturated polyester resin, a paste mixed with a filler such as calcium carbonate, a low shrinkage reducing agent, a releasing agent, a curing initiator, a thickener, and the like may be used as the paste P 1 . 
     The cutting unit  113  is located at the downstream side (+X axis side) in the conveying direction with respect to the first coating unit  112  and cuts the fiber bundle CF supplied from the fiber bundle supply unit  110  by a cutting machine  113 A and scatters the cut fiber bundles on the paste P 1 . The cutting machine  113 A is located above the first sheet S 11  conveyed by the conveyor  123  and is configured to include a guide roller  125 , a pinch roller  126 , and a cutter roller  127 . 
     While rotating, the guide roller  125  guides the fiber bundle CF supplied from the fiber bundle supply unit  110  downward. The pinch roller  126  rotates in a direction opposite to that of the guide roller  125  while interposing the fiber bundle CF with the guide roller  125 , so that the fiber bundle CF is drawn out from the plurality of bobbins  117  in cooperation with the guide roller  125 . While rotating, the cutter roller  127  cuts the fiber bundle CF so as to have a predetermined length. The cut fiber bundles CF are dropped from the portion between the guide roller  125  and the cutter roller  127  and are scattered on the paste P 1  applied on the first sheet S 11 . 
     The second sheet supply unit  114  supplies an elongated second sheet (carrier sheet) S 12  unwound from a second raw fabric roll R 12  toward the second coating unit  115 . The manufacturing device  11  is configured to include a second conveying unit  128  that conveys the second sheet S 12  toward the impregnation unit  116 . 
     The second conveying unit  128  is located above the first sheet S 11  conveyed by the conveyor  123  and is configured to include a plurality of guide rollers  129 . The second conveying unit  128  conveys the second sheet S 12  supplied from the second sheet supply unit  114  toward the -X axis direction (toward the left side in the horizontal direction) in  FIG.  1   , and after that, the direction in which the second sheet S 12  is conveyed by the plurality of rotating guide roller  129  is reversed from the lower side in the +X axis direction (toward the right side in the horizontal direction) in  FIG.  1   . 
     The second coating unit  115  is configured to include a supply box  130  that is located just above the second sheet S 12  which is conveyed toward the -X axis direction (toward the left side in the horizontal direction) in  FIG.  1    and supplies the paste P 1 . The supply box  130  coats the surface of the second sheet S 12  with a paste P 1  having a predetermined thickness from a slit (not shown) formed on the bottom surface thereof. 
     The impregnation unit  116  is located at the downstream side in the conveying direction with respect to the cutting unit  113  and is configured to include a bonding mechanism  131  and a pressing mechanism  132 . The bonding mechanism  131  is located above the other pulley  121   b  of the conveyor  123  and is configured to include a plurality of bonding rollers  133 . 
     The plurality of bonding rollers  133  are arranged side by side in the conveying direction in the state of being in contact with the back surface of the second sheet S 12  coated with the paste P 1 . In addition, the plurality of bonding rollers  133  are arranged so that the second sheet S 12  gradually approaches the first sheet S 11 . 
     In the bonding mechanism  131 , the second sheet S 12  is superimposed on the first sheet S 11 . In addition, the first sheet S 11  and the second sheet S 12  are conveyed to the pressing mechanism  132  side in the state where the sheets are bonded together while interposing the fiber bundle CF and the paste P 1  therebetween. Hereinafter, the first sheet S 11  and the second sheet S 12  bonded together while interposing the fiber bundle CF and the paste P 1  are referred to as a bonding sheet S 13 . 
     The pressing mechanism  132  is located at the downstream of the first conveying unit  119  (conveyor  123 ) and is configured to include a lower conveyor  136 A in which an endless belt  135   a  is hung between a pair of pulleys  134   a  and  134   b  and an upper conveyor  136 B in which an endless belt  135   b  is hung between a pair of pulleys  134   c  and  134   d . 
     The lower conveyor  136 A and the upper conveyor  136 B are arranged to face each other in the state where the endless belts  135   a  and  135   b  abut each other. The pressing mechanism  132  revolves the endless belt  135   a  by rotating the pair of pulleys  134   a  and  134   b  of the lower conveyor  136 A in the same direction. In addition, the pressing mechanism  132  revolves the endless belt  135   b  in the opposite direction at the same speed as that of the endless belt  135   a  by rotating the pair of pulleys  134   c  and  134   d  of the upper conveyor  136 B in the same direction. Therefore, the bonding sheet S 13  interposed between the endless belts  135   a  and  135   b  is conveyed in the +X axis direction (toward the right side in the horizontal direction) in  FIG.  1   . 
     On the lower conveyor  136 A, a pair of tension pulleys  137   a  and  137   b  for adjusting the tension applied to the endless belt  135   a  are arranged. Similarly, on the upper conveyor  136 B, a pair of tension pulleys  137   c  and  137   d  for adjusting the tension applied to the endless belt  135   b  are arranged. These tension pulleys  137   a ,  137   b ,  137   c , and  137   d  are provided on the side opposite to the abutting portion of the endless belts  135   a  and  135   b . 
     The pressing mechanism  132  is configured to include a plurality of lower rollers  138   a  and a plurality of upper rollers  138   b . The plurality of lower rollers  138   a  are arranged side by side in the conveying direction in the state of being in contact with the back surface of the abutting portion of the endless belt  135   a . Similarly, the plurality of upper rollers  138   b  are arranged side by side in the conveying direction in the state of being in contact with the back surface of the abutting portion of the endless belt  135   b . In addition, the plurality of lower rollers  138   a  and the plurality of upper rollers  138   b  are alternately arranged side by side in the conveying direction of the bonding sheet S 13 . 
     In the pressing mechanism  132 , while the bonding sheet S 13  passes between the endless belts  135   a  and  135   b , the paste P 1  and the fiber bundle CF interposed between the first sheet S 11  and the second sheet S 12  are pressed by the plurality of lower rollers  138   a  and the plurality of upper rollers  138   b . At this time, the paste P 1  is impregnated between the fiber bundles CF from both sides interposing the fiber bundle CF. 
     Therefore, it is possible to obtain the SMC raw fabric R 1  impregnated with the thermosetting resin between the fiber bundles CF. In addition, the SMC raw fabric R 1  is finally shipped as a sheet-shaped SMC (fiber-reinforced resin material) by being cut to have a predetermined length. In addition, the first sheet S 11  and the second sheet S 12  are peeled from the SMC before SMC molding. 
     In the device for manufacturing a fiber-reinforced resin material according to the invention, as in this example, it is preferable that the impregnation unit may be an impregnation unit which impregnates a resin between the fiber bundles by overlaying the second sheet coated with the resin on the first sheet to which the fiber bundles have been scattered and, after that, pressing the resin and the fiber bundles interposed between the first sheet and the second sheet. Therefore, it possible to obtain a fiber-reinforced resin material excellent in mechanical properties sufficiently impregnated with a resin as compared with the impregnation unit in which the second sheet coated with the resin is not overlaid. 
     In addition, the impregnation unit may be an impregnation unit which impregnates the resin between the fiber bundles by pressing the resin and the fiber bundle group without further overlaying the second sheet coated with the resin on the first sheet on which the fiber bundles have been scattered. 
     As illustrated in  FIGS.  1  to  3   , the manufacturing device  11  according to the embodiment is provided with a scattering unit  142  under the cutting machine  13 A. 
     The scattering unit  142  is configured to include a support rod  141  and a plurality of rods  140  extending in the conveying direction of the first sheet S 11 . 
     As illustrated in  FIG.  3   , the plurality of rods  140  are arranged in parallel to each other with an interval D therebetween in the width direction (Y axis direction) of the first sheet S 11  so as not to overlay with each other as viewed in a plan view as illustrated in  FIG.  3   . Namely, the plurality of rods  140  are arranged in parallel to each other with an interval D therebetween in the width direction (Y axis direction) of the first sheet S 11  as viewed in a plan view so that the longitudinal direction thereof is the longitudinal direction (X axis direction) of the first sheet S. In addition, each of the rods  140  is supported in a cantilever manner that each base end side (-X axis side) is attached to the support rod  141  extending in the width direction of the first seat S 11 . 
     In addition, each rod  140  has a circular cross-sectional shape as illustrated in  FIG.  4 A . The diameter of each rod  140  is in a range of about 0.1 to 10 mm. The cross-sectional shape of the rod  140  is not limited to a circle (including an ellipse) illustrated in  FIG.  4 A , but the cross-sectional shape may be appropriately modified to be a rhombus (a quadrangle) illustrated in  FIG.  4 B , a polygon (a heptagon in this example) illustrated in  FIG.  4 C , or the like. 
     As illustrated in  FIG.  2   , the plurality of rods  140  are arranged at the same height and parallel to the first sheet S 11  when the cross section of the first sheet S 11  is viewed. In addition, it is preferable that the plurality of rods  140  are arranged at positions separated by an interval (height) Hhi of at least 150 mm or more downward from the cutting machine  113 A. On the other hand, it is preferable that the plurality of rods  140  are arranged at positions separated by an interval (height) Hlo of at least 200 mm or more upward from the first sheet S 11 . 
     In the manufacturing device  11  having the above-described configuration, among the fiber bundles CF that are cut by the cutting machine  113 A and dropped, the fiber bundles CF that are in contact with the rods  140  of the scattering unit  142  tend to collapse in directions different from the conveying direction of the first sheet S 11 . Therefore, by using a simple method of arranging the plurality of rods  140  under the cutting machine  113 A, while suppressing generation of fluff (fiber scraps) from the fiber bundles CF, the fiber bundles CF can be uniformly dispersed without directionality. 
     The device for manufacturing the fiber-reinforced resin material according to the invention is not limited to the manufacturing device  11  described above. For example, instead of the scattering unit  142  having the plurality of rods  140 , a scattering unit having a gas diffuser for blowing a gas such as air to the fiber bundles CF which are cut and dropped may be installed. It is possible to uniformly disperse the fiber bundles CF without directionality by blowing a gas under a predetermined condition to the fiber bundles CF which are cut and dropped. 
     The device for manufacturing a fiber-reinforced resin material according to the invention may be a manufacturing device for manufacturing a fiber-reinforced resin material used for a stampable sheet using a thermoplastic resin instead of a thermosetting resin. 
     Method for Manufacturing Fiber-Reinforced Resin Material 
     Next, as a method for manufacturing the fiber-reinforced resin material according to the first embodiment, a method for manufacturing the SMC using the manufacturing device  11  will be described in detail. The method for manufacturing an SMC according to the embodiment includes the following coating step, cutting step, scattering step, and impregnating step. 
     Coating Step: The paste P 1  is allowed to be applied on the first sheet S 11  conveyed by the first conveying unit  119 . 
     Cutting Step: An elongated fiber bundle CF is allowed to be cut with a cutting machine  113 A. 
     Scattering Step: The cut fiber bundles CF are allowed to be dispersed and scattered on the paste P 1  applied on the first sheet S 11  by the scattering unit  142 . 
     Impregnating Step: The paste P 1  on the first sheet S 11  and the scattered fiber bundle group F 1  are allowed to be pressed to impregnate the paste P 1  between the fiber bundles CF. 
     Coating Step 
     The first sheet supply unit  111  unwinds the elongated first sheet S 11  from the first raw fabric roll R 11  and supplies the unwound first sheet S 11  to the first conveying unit  119 , and the first coating unit  112  applies the paste P 1  having a predetermined thickness. The first sheet S 11  is conveyed by the first conveying unit  119 , so that the paste P 1  applied on the first sheet S 11  is allowed to run. The thickness of the paste P 1  applied on the surface of the first sheet S 11  is not particularly limited. 
     Cutting Step 
     The elongated fiber bundle CF is drawn out from the plurality of bobbins  117  by the fiber bundle supply unit  110  and supplied to the cutting unit  113 , and the fiber bundle CF is continuously cut with a predetermined length in the cutting machine  113 A. 
     Scattering Step 
     The fiber bundles CF cut by the cutting machine  113 A are dropped toward the plurality of rods  140  arranged side by side under the cutting machine  113 A, and the fiber bundles CF are dispersed by the rods  140  and scattered on the applied paste P 1 . Therefore, a sheet-shaped fiber bundle group F is formed on the applied paste P 1 . 
     In the embodiment, the plurality of rods  140  extending in the conveying direction of the first sheet S 11  are arranged side by side under the cutting machine  113 A, so that the fiber bundles CF in contact with the rods  140  tend to collapse in directions different from the conveying direction of the first sheet S 11 . 
     Herein, the behavior of the fiber bundles CF in contact with the rods  140  will be described with reference to  FIGS.  5 A to  5 C .  FIG.  5 A  is a plan view schematically illustrating the behavior of the fiber bundles CF in contact with the rods  140 ,  FIG.  5 B  is a front view thereof, and  FIG.  5 C  is a side view thereof. 
     The fiber bundles CF cut by the cutting machine  113 A are naturally dropped downward (in the -Z axis direction). At this time, since each of the fiber bundles CF has a certain width (bundle width), after being in contact with the rods  140 , the fiber bundles CF are dropped on the first sheet S 11  while moving in the circulating direction of the rods  140 . 
     In this case, the fiber bundles CF landed on the paste P 1  of the first sheet S 11  tend to collapse in the width direction (Y axis direction) of the first sheet S 11 . On the other hand, the fiber bundles CF landed on the paste P 1  of the first sheet S 11  without being in contact with the rods  140  tend to collapse in the conveying direction (X axis direction) of the first sheet S 11  as described above. Therefore, it possible to allow the orientations of the fiber bundles CF collapsing on the paste P 1  of the surface of the first sheet S 11  to be irregular (random). 
     Therefore, according to the SMC manufacturing method according to the embodiment, by using a simple method of arranging the plurality of rods  140  under the cutting machine  113 A, it is possible to suppress generation of fluff (fiber scraps) from the fiber bundles CF, and it is possible to uniformly disperse the fiber bundles CF without directionality. As a result, it is possible to maintain the strength of the manufactured SMC to be uniform in all directions. 
     In the invention, by setting the interval D between the adjacent rods  140  illustrated in  FIG.  3    to be larger than the length of the fiber bundle CF dropped from the cutting machine  113 A, it is possible to prevent the fiber bundles CF from being deposited between the rods  140 . 
     However, if the interval D between the rods  140  is too large, the number of the fiber bundles CF that are in contact with the rods  140  is decreased, so that the above-described effect is weakened. On the other hand, if the interval D between the rods  140  is too narrow, the fiber bundles CF may be deposited between the rods  140  in a straddling state. 
     Therefore, in the invention, it is preferable that the interval D between the adjacent rods  140  as the first sheet S 11  is viewed in plan is in a range of 0.9 to 1.6 times the average length of the fiber bundles CF cut by the cutting machine  113 A. Therefore, it is possible to uniformly disperse the fiber bundles CF without directionality. 
     In addition, among the fiber bundles CF, there occurs the fiber bundles of which portion is joined without being cut during the cutting, the fiber bundles which are repeatedly cut to be shortened, or the like. For this reason, although irregularity occurs in the lengths of the cut fiber bundles CF, the average length of the fiber bundles CF described above can be obtained by excluding the fiber bundles having such exceptionally different lengths. 
     In addition, in the invention, as illustrated in  FIG.  6   , the plurality of rods  140  may be inclined downward (in the -Z axis direction) in the conveying direction (+X axis direction) of the first sheet S 11 . Namely, the plurality of rods  140  may arranged in the state where the distal end side (+X axis side) is inclined downward (in the -Z axis direction) with respect to the base end side (-X axis side) attached to the support rods  141 . In this case, it is preferable that the inclination angle θ A  of the plurality of rods  140  with respect to the plane parallel to the first sheet S 11  is larger than 0° and equal to or smaller than 40°. 
     Therefore, it is possible to prevent the fiber bundle CF from being deposited between the rods  140  in a straddling state as described above, and it is possible to allow the fiber bundle CF to be surely dropped on the surface of the first sheet S 11  in the inclination of the rods  140 . 
     In addition, the invention is not limited to such a configuration, but a configuration where the plurality of rods  140  are inclined downward (in the -Z axis direction) in a direction opposite to the conveying direction of the first sheet S 11  (-X axis direction) may be employed. In this case, the plurality of rods  140  may be arranged in the state where the base end side attached to the support rods  141  is on the +X axis side and the distal end side (-X axis side) is inclined downward (in the -Z axis direction). 
     In addition, in the invention, as illustrated by arrows in  FIGS.  7 A and  7 B , the plurality of rods  140  may be configured to be vibrated. In addition,  FIG.  7 A  is a plan view schematically illustrating the operation for explaining the operation of vibrating the plurality of rods  140 , and  FIG.  7 B  is a side view thereof. 
     In this case, the direction in which the plurality of rods  140  are vibrated may be any one of the longitudinal direction (X axis direction), the width direction (Y axis direction), and the height direction (Z axis direction). In addition, a configured may be employed where the plurality of rods  140  are vibrated in a plurality of directions. In addition, the plurality of rods  140  may be swung around the support rods  141 . 
     Therefore, it is possible not only to prevent the fiber bundle CF from being deposited between the rods  140  in a straddling state as described above and but also to more uniformly disperse the fiber bundles CF surely dropped on the surface of the first sheet S 11  without directionality. 
     In addition, the invention is not necessarily limited to those of the above embodiment, and various modifications are available within the scope without deviating from the spirit of the invention. 
     Specifically, the plurality of rods  140  are not limited to the above-described configuration where the plurality of rods are supported in a cantilever manner, but as illustrated in  FIG.  8   , for example, the plurality of rods  140  may be configured to be supported between a pair of support rods  141   a  and,  141   b  extending in the width direction of the first sheet S 11  in a both-end support manner where both ends thereof are attached to the support rods  141   a  and  141   b . 
     In addition, as illustrated in  FIG.  9   , in addition to the configuration where the plurality of rods  140  are arranged with an interval D therebetween in the width direction (Y axis direction) of the first sheet S 11  as described above, the plurality of rods may be configured to be arranged with an interval H therebetween in the height direction (Z axis direction). 
     The plurality of rods  140  may be arranged in multiple stages in the height direction (Z axis direction). In this case, it is preferable that the interval H in the height direction of the plurality of rods  140  is larger than the length of the fiber bundle CF dropped from the cutting machine  113 A. 
     In addition, the plurality of rods  140  are configured to extend in the conveying direction (X axis direction) of the first sheet S 11 , but the configuration is not limited to the case where the rods  140  may be arranged in parallel to the conveying direction (X axis direction) of the first sheet S 11 , and the rods  140  may be arranged obliquely with respect to the conveying direction (X axis direction) of the first sheet S 11 . 
     In addition, as a method of dispersing the fiber bundles, as described in International Publication No. 2014/017612, the fiber bundles can be supplied while sucking from the bottom of the net. However, in order to apply the fiber bundles to the manufacturing of a fiber-reinforced resin material that needs the fiber bundles to be dropped on the resin, further contrivance is necessary. There are various methods of uniformly dispersing the fiber bundles without directionality by lowering the conveying speed of the sheet, but in that case, it is necessary to sacrifice productivity to some extent. 
     Impregnating Step 
     The second sheet supply unit  114  unwinds the elongated second sheet S 12  from the second raw fabric roll R 12  and supplies the unwound second sheet S 12  to the second conveying unit  128 . The paste P 1  having a predetermined thickness is applied on the second sheet S 12  by the second coating unit  115 . The thickness of the paste P 1  applied on the surface of the second sheet S 12  is not particularly limited. 
     The paste P 1  applied thereon is allowed to move by conveying the second sheet S 12 , and in the impregnation unit  116 , the second sheet S 12  is bonded on the sheet-shaped fiber bundle group F 1  by the bonding mechanism  131 . Then, the pressing mechanism  132  presses the sheet-shaped fiber bundle group F 1  and the paste P 1  to impregnate the paste P 1  between the fiber bundles CF of the fiber bundle group F 1 . Therefore, the raw fabric R 1  in which the fiber-reinforced resin material is interposed between the first sheet S 11  and the second sheet S 12  is obtained. 
     As in this example, it is preferable that, the impregnating step in the manufacturing method according to the invention is a step of impregnating a resin between the fiber bundles by overlaying the second sheet coated with the resin on the first sheet on which the fiber bundles are scattered and, after that, by pressing the resin and the fiber bundle group interposed between the first sheet and the second sheet. Therefore, it possible to obtain a fiber-reinforced resin material excellent in mechanical properties sufficiently impregnated with a resin as compared with the impregnating step in which the second sheet coated with the resin is not overlaid. 
     In addition, the impregnating step may be an impregnating step of impregnating a resin between the fiber bundles by pressing the resin and the fiber bundle group without further overlaying the second sheet coated with the resin on the first sheet on which the fiber bundles are scattered. 
     As described above, in the SMC manufacturing method according to the embodiment, it is possible to uniformly disperse the cut fiber bundles CF without directionality by using the above-described simple method. As a result, it is possible to maintain the strength of the manufactured SMC to be uniform in all directions, and it is also possible to improve the productivity of the SMC. 
     In addition, the method for manufacturing a fiber-reinforced resin material according to the invention is not limited to a method using the manufacturing device  11 . For example, instead of the scattering unit  142 , a method having a step of dispersing and scattering the fiber bundles by blowing a gas such as air to the fiber bundles which are cut and dropped may be employed. It is possible to uniformly disperse the fiber bundles CF without directionality by blowing a gas under a predetermined condition to the fiber bundles CF which are cut and dropped. 
     The method for manufacturing a fiber-reinforced resin material according to the invention may be a method for manufacturing a fiber-reinforced resin material to be used for a stampable sheet by using a thermoplastic resin instead of a thermosetting resin. 
     Second Embodiment 
     In the device and the method for manufacturing a fiber-reinforced resin material according to the invention, it is preferable to inspect the fiber orientation state of the fiber bundle group formed by scattering the cut fiber bundles on the resin before impregnating the resin. 
     In order to obtain a molded article excellent in isotropic mechanical properties by using a fiber-reinforced resin material such as SMC, it is important that the fiber orientation of the fiber bundle in the fiber-reinforced resin material has no bias, but it is difficult to inspect the fiber orientation state of each fiber bundle in the fiber-reinforced resin material impregnated with the resin after the production. However, by checking the fiber orientation state of the fiber bundle group before impregnating the resin, it is possible to determine the fiber orientation state of the fiber bundle in the fiber-reinforced resin material. The fiber orientation state of the fiber bundle group can be inspected, for example, by using the fiber bundle group inspection device according to the invention which will be described later. 
     Fiber Bundle Group Inspection Device 
     The fiber bundle group inspection device according to the invention is a device for inspecting the fiber orientation state of the fiber bundle in a sheet-shaped fiber bundle group configured with the plurality of fiber bundles continuously scattered on a belt-shaped resin running in one direction. By using the fiber bundle group inspection device according to the invention, it is possible to inspect the fiber orientation state of the fiber bundle in the fiber bundle group on the production line of the fiber-reinforced resin material. 
     The fiber bundle group inspection device according to the invention is configured to include a first light irradiation means, a second light irradiation means, an imaging means, and an orientation determination means. The first light irradiation means and the second light irradiation means are means which irradiate the fiber bundle group (sheet-shaped fiber bundle group) having a sheet shape formed on the belt-shaped resin (resin sheet) running in one direction with light obliquely from the upper side in directions intersecting each other, as viewed in a plan view. The imaging means is provided above the sheet-shaped fiber bundle group and is a means for imaging a still image of the upper surface of the sheet-shaped fiber bundle group in the state where the fiber bundle group is irradiated with the light from the first light irradiation means or the second light irradiation means. The orientation determination means is a means for determining the fiber orientation state of the sheet-shaped fiber bundle group. Specifically, the orientation determination means is configured to calculate the luminance difference or the luminance ratio between the luminance in the state of being irradiated with the light from the first light irradiation means and the luminance in the state of being irradiated with the light from the second light irradiation means on the basis of the luminance information obtained from the still image captured by the imaging means. 
     Hereinafter, an example of the fiber bundle group inspection device according to the invention will be further described with reference to  FIGS.  10  to  13   . The fiber bundle group inspection device  2100  (hereinafter, simply referred to as the inspection device  2100 ) according to the embodiment inspects the fiber orientation state of a sheet-shaped fiber bundle group F 2  configured with a plurality of fiber bundles f continuously scattered on the belt-shaped resin P 2  (hereinafter, also referred to as a resin sheet P 2 ) running in one direction. The inspection device  2100  is configured to include a first light irradiation means  2102 , a second light irradiation means  2104 , an imaging means  2106 , and an orientation determination means  2108 . 
     In this example, the first light irradiation means  2102  is configured to include a pair of first irradiation units  2102   a  and a second irradiation unit  2102   b . The first irradiation unit  2102   a  and the second irradiation unit  2102   b  are provided obliquely above the fiber bundle group F 2  on the outside in the width direction of the belt-shaped resin sheet P 2  running in one direction so as to face each other. In the first light irradiation means  2102 , the fiber bundle group F 2  is irradiated with light obliquely downward from the first irradiation unit  2102   a  and the second irradiation unit  2102   b  in a direction perpendicular to the longitudinal direction (running direction) of the resin sheet P 2  as viewed in a plan view. 
     The first irradiation unit  2102   a  and the second irradiation unit  2102   b  are elongated members that are elongated in the running direction of the resin sheet P 2  and have elongated light irradiation surfaces on the side surface of the fiber bundle group F 2  side. In the first light irradiation means  2102 , the first irradiation unit  2102   a  and the second irradiation unit  2102   b  illuminate a certain range interposed between the first irradiation unit  2102   a  and the second irradiation unit  2102   b  on the upper surface of the fiber bundle group F 2 . In the invention, it is preferable that the first light irradiation means is such an elongated member. 
     As illustrated in  FIG.  13   , the first irradiation unit  2102   a  is provided to be inclined so that the upper surface of the fiber bundle group F 2  is irradiated obliquely downward with the light as viewed in a side view. The inclination angle ϕ 1  ( FIG.  13   ) of the first irradiation unit  2102   a  with respect to the horizontal direction is preferably in a range of 10 to 60°, and more preferably in a range of 20 to 45°. If the inclination angle ϕ 1  is within the above-described range, it is easy to obtain sufficient luminance information, and it is easy to determine the fiber orientation state of the fiber bundles from the luminance difference and the luminance ratio. 
     Similarly to the first irradiation unit  2102   a , the second irradiation unit  2102   b  is provided to be inclined so that the upper surface of the fiber bundle group F 2  is irradiated obliquely downward with the light. The inclination angle ϕ 2  ( FIG.  13   ) of the second irradiation unit  2102   b  with respect to the horizontal direction is preferably in a range of 10 to 60°, more preferably in a range of 20 to 45° for the same reason as the inclination angle ϕ 1  of the first irradiation unit  2102   a  with respect to the horizontal direction. 
     It is preferable that the inclination angle ϕ 1  and the inclination angle ϕ 2  are the same. In addition, the inclination angle ϕ 1  and the inclination angle ϕ 2  may be different. 
     As a light source in the first light irradiation means, any light source may be employed as long as the luminance information can be obtained by capturing the still image of the upper surface of the sheet-shaped fiber bundle group in the state where the fiber bundle group is irradiated with light by the first light irradiation means. As a specific example of the light source, there may be exemplified a white light emitting diode (white LED), a fluorescent lamp, a halogen lamp, a metal high land lamp, and the like. As the first light irradiation means, there may be exemplified a light irradiation means having an irradiation unit provided with an elongated light irradiation surface and provided with a white LED and a light diffusing plate. 
     In addition, the first light irradiation means is not limited to a light irradiation means having a pair of irradiation units, and the first light irradiation means may be configured with only one irradiation unit. 
     In this example, the second light irradiation means  2104  is configured to include a pair of third irradiation units  2104   a  and a fourth irradiation unit  2104   b . As illustrated in  FIGS.  10  to  12   , the third irradiation unit  2104   a  and the fourth irradiation unit  2104   b  are arranged on both sides of the first irradiation unit  2102   a  and the second irradiation unit  2102   b  in the running direction of the resin sheet P 2  above the fiber bundle group F 2  so as to face each other. 
     In the second light irradiation means  2104 , the fiber bundle group F 2  is irradiated with light by the third irradiation unit  2104   a  and the fourth irradiation unit  2104   b  obliquely downward and in the longitudinal direction (running direction) of the resin sheet P 2  as viewed in a plan view. In the inspection device  2100 , the light irradiation direction from the first light irradiation means  2102  and the light irradiation direction from the second light irradiation means  2104  are perpendicular to each other as viewed in a plan view. Thus, in the invention, it is preferable that the light irradiation direction from the first light irradiation means and the light irradiation direction from the second light irradiation means are perpendicular to each other, as viewed in a plan view. Therefore, it is easy to determine the fiber orientation state of the fiber bundle from the luminance difference and the luminance ratio. 
     In addition, in the invention, the light irradiation direction from the first light irradiation means and the light irradiation direction from the second light irradiation means may not be perpendicular to each other as viewed in a plan view. The angle between the light irradiation direction from the first light irradiation means and the light irradiation direction from the second light irradiation means as viewed in a plan view is preferably in a range of 60 to 120°, more preferably in a range of 80 to 100°. If the angle is within the range, it is easy to determine the fiber orientation state of the fiber bundle from the luminance difference and the luminance ratio. 
     The third irradiation unit  2104   a  and the fourth irradiation unit  2104   b  are elongated members that are elongated in the width direction of the resin sheet P 2  and have elongated light irradiation surfaces on the side surface facing the fiber bundle group F 2 . In the second light irradiation means  2104 , the third irradiation unit  2104   a  and the fourth irradiation unit  2104   b  illuminate a certain range interposed between the third irradiation unit  2104   a  and the fourth irradiation unit  2104   b  on the upper surface of the fiber bundle group F 2 . In the invention, it is preferable that one having the elongated light source is used as the second light irradiation means. The range of irradiation of the light by the second light irradiation means  2104  on the upper surface of the fiber bundle group F 2  is a range equivalent to the range irradiated by the first light irradiation means  2102 . 
     As illustrated in  FIG.  12   , the third irradiation unit  2104   a  is provided to be inclined so that the upper surface of the fiber bundle group F 2  is irradiated obliquely downward with the light. The inclination angle θ 1  ( FIG.  12   ) of the third irradiation unit  2104   a  with respect to the horizontal direction is preferably in a range of 10 to 60°, and more preferably in a range of 20 to 45°. If the inclination angle θ 1  is within the above-described range, it is easy to obtain sufficient luminance information, and it is easy to determine the fiber orientation state of the fiber bundles from the luminance difference and the luminance ratio. 
     Similarly to the third irradiation unit  2104   a , the fourth irradiation unit  2104   b  is provided to be inclined so that the upper surface of the fiber bundle group F 2  is irradiated obliquely downward with the light. The inclination angle θ 2  ( FIG.  12   ) of the fourth irradiation unit  2104   b  with respect to the horizontal direction is preferably in a range of 10 to 60°, more preferably in a range of 20 to 45° for the same reason as the inclination angle θ 1  of the third irradiation unit  2104   a  with respect to the horizontal direction. 
     It is preferable that the inclination angles ϕ 1  ϕ 2 , θ 1,  and θ 2  are the same from the viewpoint of easy determination of the fiber orientation state of the fiber bundle from the luminance difference and the luminance ratio. Though all the inclination angles are not necessarily the same, since the luminance varies depending on the inclination angle, it is necessary that ϕ 1  = θ 1 , ϕ 2  = θ 2 , or ϕ 1  = θ 2 , and ϕ 2  = θ 1.   
     As the light source in the second light irradiation means, any light source may be used as long as the luminance information can be obtained by capturing the still image of the upper surface of the fiber bundle group in the state where the light irradiated from the second light irradiation means is reflected, and the same light source as the light source in the first light irradiation means can be used. It is preferable that the light source of the first light irradiation means and the light source of the second light irradiation means are the same from the viewpoint of easy determination of the fiber orientation state of the fiber bundle from the luminance difference and the luminance ratio in the orientation determination means. As the second light irradiation means, there may be exemplified a light irradiation means having an irradiation unit provided with an elongated light irradiation surface and provided with a white LED and a light diffusion plate. 
     In addition, the second light irradiation means is not limited to a light irradiation means having a pair of irradiation units, and the second light irradiation means may be configured with only one irradiation unit. 
     The imaging means  2106  is arranged above the center of the portion surrounded by the first irradiation unit  2102   a , the second irradiation unit  2102   b , the third irradiation unit  2104   a  and the fourth irradiation unit  2104   b  so as to capture an image of the upper surface of the fiber bundle group F 2 . The imaging means  2106  can capture the still image of a portion irradiated with light by the first light irradiation means  2102  or the second light irradiation means  2104  on the upper surface of the fiber bundle group F 2 . 
     As the imaging means, any imaging means may be employed as long as the imaging means can capture a still image from which the luminance information in the state of being irradiated with light by the first light irradiation means or the second light irradiation means can be obtained. As the imaging means, there may be exemplified an imaging means having a monochrome optical sensor corresponding to the light source of the first light irradiation means or the second light irradiation means. 
     The orientation determination means  2108  is electrically connected to the imaging means  2106  and is configured to obtain the luminance information from a still image captured by the imaging means  2106 . The orientation determination means  2108  measures the luminance due to the reflected light of the upper surface of the fiber bundle group F 2  in the state of being irradiated with light by the first light irradiation means  2102  and the luminance due to the reflected light of the upper surface of the fiber bundle group F 2  in the state of being irradiated with light by the second light irradiation means  2104  and calculates the luminance difference or the luminance ratio thereof. 
     The orientation determination means is not particularly limited as long as the orientation determination means has a processing function of calculating the luminance difference or the luminance ratio from the captured still image. As the orientation determination means, there may be exemplified an orientation determination means configured to include a processing unit for processing a still image to obtain luminance information and calculating a luminance difference or a luminance ratio, a storage unit for storing a threshold value of an externally input luminance difference or luminance ratio, and a determination unit for comparing the luminance difference or the luminance ratio obtained by the processing unit with the threshold value stored in the storage unit to determine the fiber orientation state. In addition, in the case where a control means for controlling the manufacturing conditions is provided on the production line of the fiber-reinforced resin material in accordance with the determination result of the orientation determination means, it is preferable that the orientation determination means is configured to include an interface unit for transmitting the determination result of the determination unit to the control means. 
     In the inspection device  2100 , the fiber bundle group F 2  formed on the strip-shaped resin sheet P 2  running in one direction can be irradiated with light by each of the first light irradiation means  2102  and the second light irradiation means  2104  obliquely from the upper side. Then, the imaging means  2106  can capture a still image of the upper surface of the fiber bundle group F 2  in the state of being irradiated with light by the first light irradiation means  2102  or the second light irradiation means  2104 . At this time, as illustrated in  FIG.  14 A , as the angle formed by the running direction of the light as viewed in a plan view and the fiber axis direction of the fiber bundle f is closer to perpendicular, the reflection angle of the light reflected on the surface of the fiber bundle f is larger, and thus, it becomes easy for the reflected light to reach the upper imaging means  2106 . On the other hand, as illustrated in  FIG.  14 B , as the angle formed by the running direction of the light as viewed in a plan view and the fiber axis direction of the fiber bundle f is closer to parallel, the reflection angle of the light reflected on the surface of the fiber bundle f is smaller, and thus, it becomes difficult for the reflected light to reach the upper imaging means  2106 . 
     In the state where the fiber bundle group F 2  is irradiated with light by the first light irradiation means  2102 , the light propagates in the width direction of the resin sheet P 2  as viewed in a plan view. In the still image captured by the imaging means  2106  in this state, as the fiber axis direction of the fiber bundle f becomes closer to the longitudinal direction of the resin sheet P 2 , the luminance is increased. For this reason, in the state of being irradiated with light by the first light irradiation means  2102 , as the number of the fiber bundles f of which fiber axis direction is close to the longitudinal direction of the resin sheet P 2  becomes larger, the area of the bright portion due to the reflected light in the fiber bundle group F 2  in the still image is increased, and the luminance is increased. On the other hand, in the state where the fiber bundle group F 2  is irradiated with light by the second light irradiation means  2104 , the light propagates in the longitudinal direction of the resin sheet P 2  as viewed in a plan view. In the still image captured by the imaging means  2106  in this state, as the fiber axis direction of the fiber bundle f becomes closer to the width direction of the resin sheet P 2 , the luminance is increased. For this reason, in the state of being irradiated with light by the second light irradiation means  2104 , as the number of the fiber bundles f of which fiber axis direction is close to the width direction of the resin sheet P 2  becomes larger, the area of the bright portion due to the reflected light in the fiber bundle group F 2  in the still image is increased, and the luminance is increased. 
     In this manner, from the comparison of the luminances of the same ranges obtained from the still images of the fiber bundle group F 2  in the state of being irradiated with light by the first light irradiation means  2102  and in the state of being irradiated with light by the second light irradiation means  2104 , the proportion of the fiber bundles f of which fiber axis direction is close to the longitudinal direction of the resin sheet P 2  and the proportion of the fiber bundles f of which fiber axis direction is close to the width direction of the resin sheet P 2  can be known. Therefore, the fiber orientation state of the fiber bundle group F 2  can be determined. Specifically, the orientation determination means  2108  calculates the luminance difference or luminance ratio between the luminances of the states. The smaller the absolute value of the luminance difference is, the more random the fiber orientation is; and the larger the absolute value of the luminance difference, the more deviated the fiber orientation of the fiber bundle f is. In addition, the closer to 1 the luminance ratio is, the more random the fiber orientation is; and the farther away from 1 the luminance ratio is, the more deviated the fiber orientation of the fiber bundle f is. 
     As described above, by using the fiber bundle group inspection device according to the invention, it is possible to easily inspect the fiber orientation state of the fiber bundle in the running fiber bundle group even on the production line of the fiber-reinforced resin material. 
     In addition, the fiber bundle group inspection device according to the invention is not limited to the inspection device  2100  described above. For example, each of the first light irradiation means and the second light irradiation means may be an inspection device configured with one irradiation unit. In addition, the inspection device may be arranged such that the first light irradiation means is deviated to the upstream side or the downstream side of the second light irradiation means in the running direction of the resin sheet. In this case, two imaging means corresponding to the first light irradiation means and the second light irradiation means are provided. 
     In addition, the light irradiation directions as viewed in a plan view from the first light irradiation means and the second light irradiation means may be deviated from the width direction and the longitudinal direction of the resin sheet. However, it is preferable that light irradiation directions as viewed in a plan view from the first light irradiation means and the second light irradiation means coincide with the width direction and the longitudinal direction of the resin sheet, respectively. 
     The fiber bundle group inspection device according to the invention can be appropriately used for the device for manufacturing a fiber-reinforced resin material according to the invention. In addition, the fiber bundle group inspection device according to the invention may be installed in a device for manufacturing a fiber-reinforced resin material without a scattering unit and used for inspection of the fiber bundle group on the production line. 
     Fiber Bundle Group Inspecting Method 
     Hereinafter, a fiber bundle group inspecting method will be described. The fiber bundle group inspecting method includes the following imaging step and orientation determining step. 
     Imaging Step: A sheet-shaped fiber bundle group configured with a plurality of fiber bundles continuously scattered on a belt-shaped resin (resin sheet) running in one direction is irradiated separately with the first light and the second light obliquely from the upper side, and a still image of the upper surface of the fiber bundle group in the state of being irradiated with the first light or the second light is captured. 
     Orientation Determining Step: On the basis of luminance information obtained from the still image captured in the imaging step, the luminance difference or the luminance ratio between the luminance in the state of being irradiated with the first light and the luminance in the state of being irradiated with the second light is calculated to determine the fiber orientation state of the fiber bundle group. 
     Hereinafter, a method of inspecting the sheet-shaped fiber bundle group will be described by taking the case of using the inspection device  2100  as an example. 
     Imaging Step 
     The fiber bundle group F 2  configured with a plurality of fiber bundles f continuously scattered on the belt-shaped resin sheet P 2  running in one direction is irradiated with the first light obliquely from the upper side by the first light irradiation means  2102 . Then, in the state of being irradiated with the first light by the first light irradiation means  2102 , the imaging means  2106  captures the still image of the upper surface of the fiber bundle group F 2 . In addition, the irradiation of the first light by the first light irradiation means  2102  is stopped, and the fiber bundle group F 2  is irradiated with the second light by the second light irradiation means  2104  obliquely from the upper side. Then, in the state of being irradiated with the second light by the second light irradiation means  2104 , the imaging means  2106  captures the still image of the upper surface of the fiber bundle group F 2 . In this example, the first light irradiated from the first light irradiation means  2102  and the second light irradiated from the second light irradiation means  2104  are perpendicular to each other as viewed in a plan view. 
     The capturing of the still images in the state of being irradiated with the first light by the first light irradiation means  2102  and in the state of being irradiated with the second light by the second light irradiation means  2104  is performed so that at least a portion of the respective imaging ranges is overlaid in order to compare the luminance in the same range. Specifically, for example, the capturing of the still image is performed by switching the state of being irradiated with light by the first light irradiation means  2102  and the state of being irradiated with light by the second light irradiation means  2104  every 100 ms. 
     Orientation Determining Step 
     The orientation determination means  2108  measures the luminance in a specific range of the upper surface of the fiber bundle group F 2  from the still image in the state of being irradiated with the first light by the first light irradiation means  2102 . In addition, the orientation determination means measures the luminance in the same range as the specific range of the upper surface of the fiber bundle group F 2  from the still image in the state of being irradiated with the second light by the second light irradiation means  2104 . In addition, the orientation determination means calculates the luminance difference or the luminance ratio between the luminance in the state of being irradiated with the first light and the luminance in the state of being irradiated with the second light from these luminances and determines the fiber orientation state of the fiber bundle group F 2 . For example, in the case of desiring to manufacture a fiber-reinforced resin material excellent in the isotropy of mechanical properties, as the favorable absolute value of the luminance difference becomes smaller, it can be determined that the fiber orientation is good, that is, random. In addition, as the luminance ratio is closer to 1, it can be determined that the fiber orientation is good, that is, random. 
     According to the fiber bundle group inspecting method described above, it is possible to easily inspect the fiber orientation state of the fiber bundle in the running fiber bundle group even on the production line of the fiber-reinforced resin material. The fiber bundle group inspecting method is not limited to the above-described method using the inspection device  2100 , and another inspection device exemplified in the description of the inspection device may be employed. For example, in the case where the first light irradiation means is arranged to be shifted to the upstream side or the downstream side of the second light irradiation means, the imaging means corresponding to each of the first light irradiation means and the second light irradiation means may perform sequential imaging so that the imaging ranges overlay each other. 
     The fiber bundle group inspecting method described above can be appropriately used for a method for manufacturing a fiber-reinforced resin material described later. In addition, the fiber bundle group inspecting method described above may be used for inspecting a fiber bundle group on a production line in a method for manufacturing a fiber-reinforced resin material using a manufacturing device not including a scattering unit. For example, a method for manufacturing a fiber-reinforced resin material having an isotropy by changing the conveying speed of the first sheet or the like on the basis of the determination result according to the inspecting method and adjusting the fiber direction of each fiber bundle so as to be aligned with the conveying direction of the first sheet may be employed. 
     Device for Manufacturing Fiber-Reinforced Resin Material 
     Hereinafter, as an example of a device for manufacturing a fiber-reinforced resin material according to Example 2, which is an example of inspecting the fiber orientation state of the fiber bundle group on the production line, a manufacturing device for manufacturing an SMC where a paste containing a thermosetting resin is impregnated between the fiber bundles will be described. The device  21  for manufacturing a fiber-reinforced resin material (hereinafter, simply referred to as the manufacturing device  21 ) according to the embodiment will be described with reference to  FIG.  15   .  FIG.  15    is a schematic configuration view illustrating a configuration of the manufacturing device  21 . In addition, in the following description, similarly to the manufacturing device  11 , an XYZ rectangular coordinate system is set, and a positional relationship of each member will be described with reference to the XYZ rectangular coordinate system as necessary. 
     The manufacturing device  21  is configured to include a fiber bundle supply unit  210 , a first sheet supply unit  211 , a first conveying unit  219 , a first coating unit  212 , a cutting unit  213 , a scattering unit  242 , a second sheet supply unit  214 , a second conveying unit  228 , a second coating unit  215 , an impregnation unit  216 , an inspection device  2100 , and a control means  2200 . 
     The first sheet supply unit  211  supplies the elongated first sheet (carrier sheet) S 21  unwound from the first raw fabric roll R 21  to the first conveying unit  219 . The first conveying unit  219  is provided with a guide roll  220  and a conveyor  223  on which the endless belt  222  is hung between the pair of pulleys  221   a  and  221   b . The guide roll  220  guides the first carrier sheet S 21  supplied from the first sheet supply unit  211  toward the conveyor  223  while rotating. The conveyor  223  revolves the endless belt  222  by rotating the pair of pulleys  221   a  and  221   b  in the same direction and conveys the first sheet S 21  to the right side (+X axis direction) in the X axis direction on the surface of the endless belt  222 . 
     The first coating unit  212  is located immediately above the pulley  221   a  on the side of the guide roll  220  in the first conveying unit  219  and is provided with a supply box  224  for supplying the paste P 21  containing a thermosetting resin. A slit (not shown) is formed on the bottom surface of the supply box  224 , so that the paste P 21  with a predetermined thickness from the slit is applied on the surface of the conveyed first sheet S 21 . The coated paste P 21  runs with the conveyance of the first sheet S 21 . 
     The fiber bundle supply unit  210  draws out the elongated fiber bundle f from the plurality of bobbins  217  and supplies the elongated fiber bundle to the cutting unit  213  through the plurality of guide rolls  218 . The cutting unit  213  is located above the first sheet S 21  at the downstream side in the conveying direction with respect to the first coating unit  112 . The cutting unit  213  is configured to include a cutting machine  213 A that continuously cuts the fiber bundles f supplied from the fiber bundle supply unit  210  into a predetermined length. The cutting machine  213 A is configured to include a guide roller  225 , a pinch roller  226 , and a cutter roller  227 . The guide roller  225  guides the fiber bundles f supplied from the fiber bundle supply unit  210  downward while rotating. The pinch roller  226  rotates in the direction opposite to the guide roller  225  while interposing the fiber bundles f with the guide roller  225 . Therefore, the fiber bundles f are drawn out from the plurality of bobbins  217 . The cutter roller  227  cuts the fiber bundle f while rotating so as to have a predetermined length. The fiber bundles f cut to have a predetermined length by the cutting machine  213 A are dropped and scattered on the paste P 21  to form a sheet-shaped fiber bundle group F 2 . 
     The scattering unit  242  is arranged between the paste P 21  applied on the first sheet S 21  and the cutting machine  213 A. The scattering unit  242  includes the plurality of rods  140 . As in the first embodiment, the plurality of rods  240  are arranged in parallel to each other with a space therebetween in the width direction (Y axis direction) of the first sheet S 21  as viewed in a plan view so that the longitudinal direction thereof becomes the longitudinal direction (X axis direction) of the first sheet S 21 . Each of the rods  240  is supported, for example, in a manner that one end of each rod  240  is attached to the support rod. The fiber bundles f that are in contact with the rods  240  among the fiber bundles f that are cut by the cutting machine  213 A and dropped tend to collapse in directions different from the running direction of the first seat S 21 . Therefore, it is possible to uniformly disperse the fiber bundles f on the paste P 21  applied on the first sheet S 21  without directionality while suppressing generation of fluff (fiber scraps) from the fiber bundle f. 
     As an appearance of each of the rods  240 , the same appearance as each of the rods  140  of the first embodiment may be exemplified, and preferred appearances are also the same. Specifically, the height of each of the rods  240  from the first sheet S 21  can be appropriately set. The cross-sectional shape of the rod  240  may be a circle, a rectangle, a polygon, or the like, and a circular shape is preferable. The diameter of each of the rods  240  may be set to be, for example, in a range of about 0.1 to 10 mm. 
     The interval between the adjacent rods  240  as viewed in a plan view is preferably in a range of 0.9 to 1.6 times the average length of the fiber bundles f cut by the cutting machine  213 A. If the interval is equal to or larger than the lower limit value, the fiber bundle f is less likely to be deposited between the rods  240 . If the interval is equal to or smaller than the upper limit value, since a sufficient proportion of the fiber bundles f are in contact with the rods  240 , the fiber bundle group F 2  having random fiber orientation tends to be formed. 
     It is preferable that the rods  240  are close to the horizontal direction from the viewpoint of easy formation of the fiber bundle group F 2  in which the fiber bundles f are scattered in random fiber orientations. In the case where the rods  240  are allowed to be inclined, the inclination angle α ( FIG.  16   ) of the rods  240  with respect to the horizontal direction is preferably larger than 0° and equal to or smaller than 40°. 
     The rods  240  may be allowed to be vibrated. In this case, the direction in which the rods  240  is allowed to vibrate may be any one of the longitudinal direction (X axis direction), the width direction (Y axis direction), and the height direction (Z axis direction). The rods  240  may be vibrated in a plurality of directions. 
     The second sheet supply unit  214  supplies the elongated second sheet (carrier sheet) S 22  unwound from the second raw fabric roll R 22  to the second conveying unit  228 . The second conveying unit  228  is located above the first sheet S 21  conveyed by the conveyor  223  and is provided with a plurality of guide rolls  229 . The second conveying unit  228  conveys the second sheet S 22  supplied from the second sheet supply unit  214  in a direction (left side in the X axis direction) opposite to the first sheet S 21  and, after that, reverses the conveying direction to the same direction as the first sheet S 21  by the plurality of guide rolls  229 . 
     The second coating unit  215  is located immediately above the second sheet S 22  being conveyed in a direction opposite to that of the first sheet S 21  and is provided with a supply box  230  for supplying the paste P 21  containing a thermosetting resin. A slit (not shown) is formed on the bottom surface of the supply box  230 , so that the paste P 21  with a predetermined thickness from the slit is applied on the surface of the conveyed second sheet S 22 . The coated paste P 21  runs with the conveyance of the second sheet S 22 . 
     The impregnation unit  216  is located on the downstream side of the cutting machine  213 A in the conveying direction and is provided with a bonding mechanism  231  and a pressing mechanism  232 . The bonding mechanism  231  is located above the other pulley  221   b  of the conveyor  223  and is provided with a plurality of bonding rolls  233 . The plurality of bonding rolls  233  are arranged side by side in the conveying direction in the state of being in contact with the back surface of the second sheet S 22  on which the paste P 21  is formed. In addition, the plurality of bonding rolls  233  are arranged so that the second sheet S 22  gradually approaches the first sheet S 21 . 
     In the bonding mechanism  231 , the first sheet S 21  and the second sheet S 22  are conveyed while being overlaid in the state of interposing the paste P 21 , the fiber bundle group F 2  and the paste P 21  therebetween. Herein, the one in which the first sheet S 21  and the second sheet S 22  are bonded while interposing the paste P 21 , the fiber bundle group F 2 , and the paste P 21  is referred to as a bonding sheet S 23 . 
     The pressing mechanism  232  is located on the downstream side of the bonding mechanism  231  and is provided with a lower conveyor  236 A having an endless belt  235   a  hung between a pair of pulleys  234   a  and  234   b  and an upper conveyor  236 B having an endless belt  235   b  hung between a pair of pulleys  234   c  and  234   d . The lower conveyor  236 A and the upper conveyor  236 B are arranged to face each other in the state where the endless belts  235   a  and  235   b  abut each other. 
     In the pressing mechanism  232 , by rotating the pair of pulleys  234   a  and  234   b  of the lower conveyor  236 A in the same direction, the endless belt  235   a  is revolved. In addition, in the pressing mechanism  232 , by rotating the pair of pulleys  234   c ,  234   d  of the upper conveyor  236 B in the same direction, the endless belt  235   b  is revolved in the opposite direction at the same speed as the endless belt  235   a . Therefore, the bonding sheet S 23  interposed between the endless belts  235   a  and  235   b  is conveyed to the right side in the X axis direction. 
     A pair of tension pulleys  237   a  and  237   b  for adjusting the tension applied to the endless belt  235   a  is arranged in the lower conveyor  236 A. Similarly, a pair of tension pulleys  237   c  and  237   d  for adjusting the tension applied to the endless belt  235   a  are arranged in the upper conveyor  236 B. These tension pulleys  237   a ,  237   b ,  237   c , and  237   d  are provided on the side opposite to the abutting portion of the endless belts  235   a ,  235   b . 
     The pressing mechanism  232  is further provided with a plurality of lower rolls  238   a  and a plurality of upper rolls  238   b . The plurality of lower rolls  238   a  are arranged side by side in the conveying direction in the state of being in contact with the back surface of the abutting portion of the endless belt  235   a . Similarly, the plurality of upper rolls  238   b  are arranged side by side in the conveying direction in the state of being in contact with the back surface of the abutting portion of the endless belt  235   b . In addition, the plurality of lower rolls  238   a  and the plurality of upper rolls  238   b  are alternately arranged side by side in the conveying direction of the bonding sheet S 23 . 
     In the pressing mechanism  232 , while the bonding sheet S 23  passes between the endless belts  235   a  and  235   b , the paste P 21 , the fiber bundle group F 2 , and the paste P 21  interposed between the first sheet S 21  and the second sheet S 22  are pressed by the plurality of lower rolls  238   a  and the plurality of upper rolls  238   b . At this time, the paste P 21  is impregnated into the fiber bundle group F 2 . Therefore, the raw fabric R 2  of the fiber-reinforced resin material (SMC) is obtained. The raw fabric R 2  can be cut into a predetermined length to be used for molding. In addition, the first sheet S 21  and the second sheet S 22  are peeled off from the SMC before molding the SMC. 
     The inspection device  2100  is provided above the first sheet S 21  between the cutting machine  213 A and the bonding mechanism  231 . Specifically, as illustrated in  FIGS.  10  to  13   , the first irradiation unit  2102   a  and the second irradiation unit  2102   b  of the first light irradiation means  2102  are arranged obliquely above the fiber bundle group F 2  on the outer side in the width direction of the paste P 21  so as to face each other. In addition, the third irradiation unit  2104   a  and the fourth irradiation unit  2104   b  of the second light irradiation means  2104  are arranged above the fiber bundle group F 2  on both sides of the first irradiation unit  2102   a  and the second irradiation unit  2102   b  in the running direction of the paste P 21  so as to face each other. In addition, the imaging means  2106  is provided above the center of the portion surrounded by the first irradiation unit  2102   a , the second irradiation unit  2102   b , the third irradiation unit  2104   a , and the fourth irradiation unit  2104   b . In addition, the orientation determination means  2108  electrically connected to the imaging means  2106  is provided. 
     The control means  2200  is electrically connected to the orientation determination means  2108 , and the result of the determination by the orientation determination means  2108  is transmitted. The control means  2200  is configured to control the inclination angle α and the vibration frequency of the rods  240  with respect to the horizontal direction. In addition, the control means  2200  adjusts the rotation of the pair of pulleys  221   a  and  221   b  in the first conveying unit  219  and controls the speed of the conveyor  223 , so that the running speed of the paste P 21  running together with the conveyed first sheet S 21  can be controlled. 
     In addition, the device for manufacturing a fiber-reinforced resin material provided with the inspection device is not limited to the manufacturing device  21  described above. For example, instead of the scattering unit  242  having the plurality of rods  240 , a scattering unit having a gas diffuser for blowing a gas such as air to the fiber bundles f that are cut and dropped may be installed. In addition, the device for manufacturing a fiber-reinforced resin material provided with the inspection device may be a manufacturing device for manufacturing a fiber-reinforced resin material used for a stampable sheet using a thermoplastic resin instead of a thermosetting resin. 
     Method for Manufacturing Fiber-Reinforced Resin Material 
     In the method for manufacturing a fiber-reinforced resin material according to the invention, an inspecting step of inspecting the fiber orientation state of fiber bundles scattered on the resin after the scattering step can be included. In the method for manufacturing a fiber-reinforced resin material including an inspecting step, it is preferable that the inspecting step includes the following imaging step and orientation determining step. 
     Imaging Step: The fiber bundle group formed by dispersing the cut fiber bundles in the resin is irradiated with the first light and the second light separately obliquely from the upper side in directions intersecting each other as viewed in a plan view, and the still image of the upper surface of the fiber bundle group in the state of being irradiated with the first light or the second light is captured. 
     Orientation Determining Step: On the basis of luminance information obtained from the still image captured in the imaging step, the luminance difference or the luminance ratio between the luminance in the state of being irradiated with the first light and the luminance in the state of being irradiated with the second light is calculated to determine the fiber orientation state of the fiber bundle group. 
     Hereinafter, a method using the manufacturing device  21  will be described as an example of a method for manufacturing a fiber-reinforced resin material according to the second embodiment that includes an inspecting step. The method for manufacturing a fiber-reinforced resin material according to the embodiment is a method for manufacturing a fiber-reinforced resin material (SMC) containing a plurality of fiber bundles and a resin by using the fiber bundle group inspecting method according to the invention described above. The method for manufacturing a fiber-reinforced resin material according to the embodiment is a method including the following coating step, cutting step, scattering step, inspecting step, impregnating step, and control step. 
     Coating Step: The paste P 21  is allowed to be applied on the first sheet S 21  conveyed by the first conveying unit  219 . 
     Cutting Step: An elongated fiber bundle f is allowed to be cut with a cutting machine  213 A. 
     Scattering Step: The cut fiber bundles f are allowed to be dispersed and continuously scattered on the belt-shaped paste P 21  which is applied on the first sheet S 21  and is running in one direction, by the scattering unit  242  to form a fiber bundle group F 2 . 
     Inspecting Step: A fiber orientation state of the fiber bundle group F 2  formed on the paste P 21  is inspected by the inspection device  2100 . 
     Impregnating Step: After the inspecting step, the paste P 21  and the fiber bundle group F 2  on the first sheet S 21  are allowed to be pressed to impregnate the paste P 21  between the fiber bundles f to obtain a fiber-reinforced resin material. 
     Control Step: A condition of the scattering step is allowed to be changed on the basis of an inspection result of the inspecting step to control the fiber orientation state of the fiber bundle group F 2 . 
     Coating Step 
     The first sheet supply unit  211  unwinds the elongated first sheet S 21  from the first raw fabric roll R 21  and supplies the unwound first sheet S 21  to the first conveying unit  219 , and the first coating unit  212  applies the paste P 21  having a predetermined thickness. The first sheet S 21  is conveyed by the first conveying unit  219 , so that the paste P 21  applied on the first sheet S 21  is allowed to run. The thickness of the paste P 21  applied on the surface of the first sheet S 21  is not particularly limited. 
     The thermosetting resin contained in the paste P 21  is not particularly limited, and an unsaturated polyester resin and the like may be exemplified. A filler such as calcium carbonate, a low shrinkage reducing agent, a release agent, a curing initiator, a thickener, or the like may be mixed in the paste P 21 . 
     Cutting Step 
     The elongated fiber bundle f is drawn out from the plurality of bobbins  217  by the fiber bundle supply unit  210  and supplied to the cutting unit  213 , and the fiber bundle f is continuously cut with a predetermined length in the cutting machine  213 A. 
     Scattering Step 
     Since the plurality of rods  240  are arranged side by side between the first sheet S 21  and the cutting machine  213 A, the fiber bundles f cut by the cutting machine  213 A are dropped toward the plurality of rods  240 . A portion of the fiber bundles f that are cut by the cutting machine  213 A and dropped is in contact with the rods  240  and faces in a direction different from the running direction of the first seat S 21 . Therefore, the fiber bundles f are dispersed, and a sheet-shaped fiber bundle group F 2  is formed where the fiber bundles f are scattered in random fiber orientations on the applied paste P 21 . The thickness of the fiber bundle group F 2  is not particularly limited. 
     The fiber bundle is preferably a carbon fiber bundle. In addition, as the fiber bundle, a glass fiber bundle may be used. 
     Inspecting Step 
     In the imaging step, the fiber bundle group F 2  is irradiated with the first light by the first light irradiation means  2102 , and a still image of the upper surface of the fiber bundle group F 2  is captured by the imaging means  2106 . In addition, the second light irradiation means  2104  irradiates the fiber bundle group F 2  with the second light, and the imaging means  2106  captures the still image of the upper surface of the fiber bundle group F 2 . Next, in the orientation determining step, the orientation determination means  2108  measures the luminance in the state of being irradiated with the first light and the luminance in the state of being irradiated with the second light from each still image, calculates the luminance ratio, and determines the fiber orientation state of the fiber bundle group F 2 . 
     Impregnating Step 
     The second sheet supply unit  214  unwinds the elongated second sheet S 22  from the second raw fabric roll R 22  and supplies the unwound second sheet S 22  to the second conveying unit  228 . The paste P 21  having a predetermined thickness is applied on the surface of the second sheet S 22  by the second coating unit  215 . The thickness of the paste P 21  applied on the second sheet S 22  is not particularly limited. 
     The paste P 21  is allowed to run by conveying the second sheet S 22 , and in the impregnation unit  216 , the paste P 21  is bonded on the fiber bundle group F 2  after the inspection by the bonding mechanism  231 . Then, the paste P 21 , the fiber bundle group F 2 , and the paste P 21  are pressed by the pressing mechanism  232 , and the paste P 21  is impregnated into the fiber bundle group F 2 . Therefore, the raw fabric R 2  in which the fiber-reinforced resin material is interposed between the first sheet S 21  and the second sheet S 22  is obtained. 
     Control Step 
     In the control step, the determination result is transmitted from the orientation determination means  2108  to the control means  2200 , and the condition of the scattering step is controlled on the basis of the determination result to adjust the orientation state of each fiber bundle in the fiber bundle group F 2 . 
     The running speed of the paste P 21  on the first sheet S 21  greatly influences the fiber orientation state of the fiber bundle group F 2 . Since the first sheet S 21  is conveyed even after the distal ends of the cut fiber bundles f land on the paste P 21 , the fiber direction of each fiber bundle f is easy to align with the running direction of the first sheet S 21 . The faster the conveying speed of the first sheet S 21  is, the more easily the fiber bundle f is pulled in the conveying direction of the first sheet S 21  before the fiber bundle f collapse in the direction perpendicular to the conveying direction of the first sheet S 21  after landing, and the orientation of the first sheet S 21  in the conveying direction becomes conspicuous. For this reason, it is preferable that, in the control step, by adjusting the speed of the conveyor  223  on the basis of the inspection result of the inspecting step, the conveying speed of the first sheet S 21  and the running speed of the paste P 21  applied on the first sheet S 21  are changed, and the orientation state of each fiber bundle in the fiber bundle group F 2  is controlled. 
     For example, in the case where the orientation determination means  2108  determines that the fiber orientation of the fiber bundle group F 2  is biased and defective, the control means  2200  controls the conveying speed of the first sheet S 21  and the running speed of the paste P 21  applied on the first sheet S 21  to be lowered, so that the fiber direction of each fiber bundle f is prevented from being aligned with the conveying direction of the first sheet S 21 . In this manner, in the case where the conveying speed of the first sheet S 21  and the running speed of the paste P 21  applied on the first sheet S 21  are changed by adjusting the speed of the conveyor  223 , the supplying speed at which the fiber bundles f are supplied to the cutting unit  213  and the cutting speed of the cutting machine  213 A are also adjusted accordingly. 
     The inclination angle α with respect to the horizontal direction of the rods  240  also influences the fiber orientation state of the fiber bundle group F 2 . For this reason, it is preferable that, in the control step, the fiber orientation state of the plurality of fiber bundles f in the fiber bundle group F 2  is controlled by changing the inclination angle α with respect to the horizontal direction of the plurality of rods  240  on the basis of the inspection result of the inspecting step. In addition, the frequency of the rods  240  also influences the fiber state of the fiber bundle group F 2 . For this reason, it is preferable that, in the control step, the fiber orientation state of the plurality of fiber bundles f in the fiber bundle group F 2  is controlled by changing the frequency of the plurality of rods  240  on the basis of the inspection result of the inspecting step. 
     The only one of the control of the fiber orientation state by changing the conveying speed of the first sheet S 21  and the running speed of the paste P 21  on the first sheet S 21 , the control of the fiber orientation state by changing the inclination angle α of the rods  240  with respect to the horizontal direction, and the control of the fiber orientation state by changing the vibration frequency of  240  may be performed, or two or more thereof may be combined. 
     In the related art, there is known a method of evaluating a fiber direction of an anisotropic fiber sheet when laminating a plurality of sheet-shaped anisotropic fiber sheets which do not contain resin and have directionality in the fiber. Specifically, JP 2007-187545 A discloses a method of capturing a moving picture of a sheet surface while irradiating the sheet surface with light from a light source moving relative to the anisotropic fiber sheet and determining a fiber orientation direction from a locus along which a bright portion due to the light reflected on the fiber on the sheet surface is moved. 
     However, even if the above-described method is applied to a fiber-reinforced resin material such as an SMC after production, since the resin is impregnated, the light reflected on the fiber cannot be sufficiently obtained, and it is difficult to determine the fiber orientation state from the locus of the bright portion. In addition, although it may be conceivable to inspect the fiber orientation state of the fiber bundle group on the production line of the fiber-reinforced resin material by using the above-described method, but it is difficult to inspect the fiber orientation state of the fiber bundle group on the production line for continuously manufacturing the fiber-reinforced resin material. Specifically, on the production line of the fiber-reinforced resin material, since the fiber bundle group runs together with the first sheet and the resin (paste), the locus of the bright portion due to the reflected light in each fiber bundle is not aligned with the orientation direction of the fiber bundle. In addition, since the fiber bundle group in the fiber-reinforced resin material is formed by the cut fiber bundles with a short fiber length, the moving distance of the bright portion in each fiber bundle becomes short. From these facts, it is difficult to inspect the fiber orientation state of the fiber bundle group from the locus of the bright portion on the production line of the fiber-reinforced resin material. 
     On the other hand, according to the method for manufacturing a fiber-reinforced resin material according to the second embodiment, the fiber orientation state of the fiber bundle group on the production line can be inspected, and the fiber orientation state in the fiber-reinforced resin material can be easily determined. In addition, it is possible to manufacture the fiber-reinforced resin material by changing the manufacturing conditions according to the inspection result and controlling the fiber orientation state of the fiber bundle group. 
     The method for manufacturing a fiber-reinforced resin material according to the invention is not limited to the method using the manufacturing device  21  described above. For example, a manufacturing method using an inspection device other than the inspection device  2100  may be employed. In addition, even in the case where the operator manually controls the manufacturing conditions by checking the inspection result, the method for manufacturing a fiber-reinforced resin material according to the invention may be a method using the manufacturing device not equipped with the control means. 
     The method for manufacturing a fiber-reinforced resin material having an inspecting step may be a method in which the scattering step is a step of dispersing and scattering a gas such as air on fiber bundles that are cut and dropped. In addition, a method for manufacturing a fiber-reinforced resin material having an inspecting step may be a method for manufacturing a fiber-reinforced resin material to be used for a stampable sheet by using a thermoplastic resin instead of a thermosetting resin. 
     Fiber-Reinforced Resin Material 
     Next, as a fiber-reinforced resin material according to one embodiment of the invention, a fiber-reinforced resin material manufactured by the above-described method for manufacturing a fiber-reinforced resin material will be specifically described. 
     The fiber-reinforced resin material according to one embodiment of the invention is a sheet-shaped fiber-reinforced resin material impregnated with a resin between dispersed fiber bundles, diffracted X rays at a diffraction angle 2θ of 25.4° are detected by an X-ray diffraction method, and the roughness β obtained by the following Mathematical Formulas (1) to (3) is in a range of 0.5 to 4.5. 
     
       
         
           
             
               
                 β 
                 = 
               
             
             
               
                 
                   
                     
                       ∫ 
                       0 
                       
                         360 
                       
                     
                     
                       
                         
                           f 
                           
                             ϕ 
                           
                         
                       
                       d 
                       ϕ 
                       × 
                       
                         1 
                         
                           360 
                         
                       
                       = 
                       
                         
                           
                             
                               ∑ 
                               
                                 i 
                                 = 
                                 2 
                               
                               N 
                             
                             
                               
                                 
                                   
                                     
                                       f 
                                       
                                         
                                           
                                             ϕ 
                                             i 
                                           
                                         
                                       
                                     
                                   
                                   + 
                                   
                                     
                                       f 
                                       
                                         
                                           
                                             ϕ 
                                             
                                               i 
                                               − 
                                               1 
                                             
                                           
                                         
                                       
                                     
                                   
                                 
                               
                               × 
                               d 
                               ϕ 
                               × 
                               
                                 1 
                                 2 
                               
                             
                           
                         
                       
                     
                   
                 
                 × 
                 
                   1 
                   
                     360 
                   
                 
               
             
           
         
       
     
     In the above Mathematical Formula, f(ϕ i ) is a luminance obtained by subtracting the average luminance from the luminance (I(ϕ i )) at an i-th rotation angle (ϕ i ) in the X-ray diffraction measurement represented by the following Mathematical Formula (2), and dϕ is the step width of the X-ray diffraction measurement. I(ϕ i ) is normalized so that the integration strength represented by the following Mathematical Formula (3) becomes 10000. 
     
       
         
           
             f 
             
               
                 
                   ϕ 
                   i 
                 
               
             
             = 
             I 
             
               
                 
                   ϕ 
                   i 
                 
               
             
             − 
             
               
                 
                   ∑ 
                   
                     
                         
                       
                         i 
                         = 
                         1 
                       
                       N 
                     
                     I 
                     
                       
                         
                           ϕ 
                           i 
                         
                       
                     
                   
                 
               
               N 
             
           
         
       
     
     
       
         
           
             
               
                 
                   ∫ 
                   0 
                   
                     360 
                   
                 
                 
                   I 
                   
                     ϕ 
                   
                   d 
                   ϕ 
                   = 
                 
               
             
             
               
                 ∑ 
                 
                   i 
                   = 
                   2 
                 
                 N 
               
               
                 
                   
                     I 
                     
                       
                         
                           ϕ 
                           i 
                         
                       
                     
                     + 
                     I 
                     
                       
                         
                           ϕ 
                           
                             i 
                             − 
                             1 
                           
                         
                       
                     
                   
                 
                 × 
                 d 
                 ϕ 
                 × 
                 
                   1 
                   2 
                 
                 = 
                 10000 
               
             
           
         
       
     
     The roughness β is a value obtained from a profile derived from fiber orientation in X-ray diffraction measurement of the fiber-reinforced resin material and is measured by the following method. 
     In the sheet-shaped fiber-reinforced resin material where two sheet samples obtained by cutting the fiber-reinforced resin material which is continuous in the longitudinal direction in the width direction are overlaid in such a manner that the longitudinal directions of the two samples are the same, 25 test pieces having a size of 15 mm in length x 15 mm width at equal intervals (N =  25 ) are cut from a range of 300 mm in length × 300 mm in width. By using an X-ray apparatus, the test piece was rotated about the thickness direction thereof while the test piece was irradiated with X-rays by a transmission method, and a diffracted X ray is detected by a detector arranged at a diffraction angle 2θ = 25.4°, so that the luminance (I(ϕ i )) at an i-th rotation angle (ϕ i ) is measured. However, I(ϕ i ) is assumed to be normalized so that the integration strength represented by Mathematical Formula (3) becomes 10000. 
     Then, as represented by Mathematical Formula (2), the luminance f(ϕ i ) obtained by subtracting the average luminance from the luminance (I(ϕ i )) is defined, the roughness for each of the 25 test pieces is obtained from Mathematical Formula (1) derived using the luminance f(ϕ i ), and the average value thereof is defined as the roughness β. 
     The roughness β indicates that, as the roughness becomes close to zero, the orientation of the fiber bundle becomes less disturbed. 
     If the roughness β is equal to or larger than 0.5, the uniformity of orientation of the fiber bundle is not to be too high, and thus, it is possible to prevent the formability from being deteriorated due to impairment of the flowability of the resin at the time of being molding-processed as an SMC or a stampable sheet. In addition, it is unnecessary to excessively lower the speed of the production line of the fiber-reinforced resin material, and it is possible to secure sufficient productivity. The roughness β is preferably equal to or larger than 1.0, more preferably equal to or larger than 1.5, further preferably equal to or larger 2.0, particularly preferably equal to or larger than 2.5. 
     If the roughness β is equal to or smaller than 4.5, it is possible to prevent the anisotropy (for example, the bending modulus of elasticity in the longitudinal direction and the width direction) of the physical properties at each part of the molded article obtained by molding the sheet-shaped fiber-reinforced resin material from being too high. The roughness β is preferably equal to or smaller than 4.0, more preferably equal to or smaller than 3.5. 
     The fiber-reinforced resin material according to one embodiment of the invention is a sheet-shaped fiber-reinforced resin material impregnated with a resin between dispersed fiber bundles, and when the longitudinal direction of the fiber-reinforced resin material is set to 0° direction and the width direction is to set to 90°, a diffracted X-ray with a diffraction angle 2θ of 25.4° is detected by an X-ray diffraction method, the sum of the average value and the standard deviation of the degree of crystal orientation f a  of the fiber bundle based on the 0° direction obtained by the following Mathematical Formulas (4) to (6) is in a range of 0.05 to 0.13. 
     
       
         
           
             
               f 
               a 
             
             = 
             2 
             a 
             − 
             1 
           
         
       
     
     
       
         
           
             a 
             = 
             
               
                 
                   ∑ 
                   
                     
                         
                       
                         i 
                         = 
                         1 
                       
                       N 
                     
                     I 
                     
                       
                         
                           ϕ 
                           i 
                         
                       
                     
                     
                       
                         cos 
                       
                       2 
                     
                     
                       ϕ 
                       i 
                     
                   
                 
               
               
                 
                   ∑ 
                   
                     
                         
                       
                         i 
                         = 
                         1 
                       
                       N 
                     
                     I 
                     
                       
                         
                           ϕ 
                           i 
                         
                       
                     
                   
                 
               
             
           
         
       
     
     
       
         
           
             
               
                 
                   ∫ 
                   0 
                   
                     360 
                   
                 
                 
                   I 
                   
                     ϕ 
                   
                   d 
                   ϕ 
                   = 
                 
               
             
             
               
                 ∑ 
                 
                   i 
                   = 
                   2 
                 
                 N 
               
               
                 
                   
                     I 
                     
                       
                         
                           ϕ 
                           i 
                         
                       
                     
                     + 
                     I 
                     
                       
                         
                           ϕ 
                           
                             i 
                             − 
                             1 
                           
                         
                       
                     
                   
                 
                 × 
                 d 
                 ϕ 
                 × 
                 
                   1 
                   2 
                 
                 = 
                 10000 
               
             
           
         
       
     
     In Mathematical Formula (4), “a” is the orientation coefficient represented by Mathematical Formula (5). I(ϕ i ) is the luminance at the i-th rotation angle (ϕ i ) in the X-ray diffraction measurement and is normalized so that the integration strength represented by Mathematical Formula (6) becomes 10000. 
     The degree of crystal orientation of the fiber bundle is a value obtained from the degree of crystal orientation calculated from the diffraction image generated by irradiating the fiber-reinforced resin material with X rays and is measured by the following method. 
     Similarly to the measurement method for the roughness β, 25 test pieces are cut out from the sheet-shaped fiber-reinforced resin material (N = 25), and by using an X-ray apparatus, a diffracted X-ray with a diffraction angle 20 = 25.4° is obtained, so that the luminance (I(ϕ i )) at an i-th rotation angle (ϕ i ) is measured. However, I(ϕ i ) is assumed to be normalized so that the integration strength represented by Mathematical Formula (6) becomes 10000. Next, by using the measured I(ϕ i ), the orientation coefficient “a” for each of the 25 test pieces is obtained by Mathematical Formula (5). In addition, by using the obtained orientation coefficient “a”, the degree of crystal orientation f a  for each of the 25 test pieces is obtained by Mathematical Formula (4), and the average value and standard deviation thereof are calculated. 
     If the sum of the average value and the standard deviation of the degree of crystal orientation f a  of the fiber bundle is equal to or larger than 0.05, the uniformity of the orientation of the fiber bundle is not to be too high, and thus, it is possible to prevent the formability from being deteriorated due to impairment of the flowability of the resin at the time of being molding-processed as an SMC or a stampable sheet. In addition, it is unnecessary to excessively lower the speed of the production line of the fiber-reinforced resin material, and it is possible to secure sufficient productivity. 
     The sum of the average value and the standard deviation of the degree of crystal orientation f a  of the fiber bundle is preferably equal to or larger than 0.06, more preferably equal to or larger than 0.08. 
     If the sum of the average value and the standard deviation of the degree of crystal orientation f a  of the fiber bundle is equal to smaller than 0.13, it is possible to suppress the irregularity (CV value) of the physical properties between the portions in the longitudinal direction and the width direction of the molded article formed with the fiber-reinforced resin material from becoming too large. 
     The sum of the average value and the standard deviation of the degree of crystal orientation f a  of the fiber bundle is preferably equal to or smaller than 0.12, more preferably equal to or smaller than 0.11. 
     As described above, with respect to the fiber-reinforced resin material according to the invention, since it is possible to uniformly disperse the cut fiber bundles without directionality by using the above-described method for manufacturing a fiber-reinforced resin material, the strength is maintained to be uniform in all directions. In addition, since the fiber-reinforced resin material according to the invention has excellent resin flowability during molding processing, the fiber-reinforced resin material is excellent in moldability. 
     Molded Article 
     The molded article according to the invention is a molded article of a sheet-shaped fiber-reinforced resin material in which a resin is impregnated between dispersed fiber bundles. In the molded article according to the invention, when the longitudinal direction of the molded article is set to the 0° direction and the width direction is set to the 90° direction, the ratio (0° bending modulus of elasticity/90° bending modulus of elasticity) of the bending moduli of elasticity [GPa] in the respective directions is in a range of 0.8 to 1.2. In the molded article according to the invention, any one of the coefficients of variation (CV) of the bending moduli of elasticity (CV of 0° bending modulus of elasticity and CV of 90° bending modulus of elasticity) in the respective directions of 0° and 90° [%] is in a range of 5 to 15. 
     The ratio (0° bending modulus of elasticity/90° bending modulus of elasticity) is a value indicating the uniformity of the orientation direction of the fiber bundle in the molded article. The ratio (0° bending modulus of elasticity/90° bending modulus of elasticity) is in a range of 0.8 to 1.2, preferably in a range of 0.9 to 1.1, more preferably in a range of 0.95 to 1.05. If the ratio (0° bending modulus of elasticity/90° bending modulus of elasticity) is within the above-described range, the anisotropy of the physical properties of the molded article is sufficiently low, and thus, there is no practical problem. 
     The coefficient of variation (CV) of the 0° bending modulus of elasticity is in a range of 5 to 15, preferably in a range of 5 to 12, more preferably in a range of 7 to 9. If the coefficient of variation (CV) of the 0° bending modulus of elasticity is equal to or larger than the lower limit value, the uniformity of orientation of the fiber bundle becomes too high, and the flowability of the resin at the time of molding processing as an SMC or a stampable sheet is impaired, so that it is possible to suppress deterioration of moldability. In addition, it is unnecessary to excessively lower the speed of the production line of the fiber-reinforced resin material, and it is possible to secure sufficient productivity. If the coefficient of variation (CV) of the 0° bending modulus of elasticity is equal to or smaller than the upper limit value, the irregularity (CV value) of the physical properties between the portions in the longitudinal direction of the molded article is sufficiently small. 
     The coefficient of variation (CV) of the 90° bending modulus of elasticity is in a range of 5 to 15, preferably in a range of 5 to 12, more preferably in a range of 7 to 9 for the same reason as the coefficient of variation (CV) of 0° bending modulus of elasticity. If the variation coefficient (CV) of the 90° bending modulus of elasticity is equal to or smaller than the upper limit value, the irregularity (CV value) of the physical properties between the portions in the width direction of the molded article is sufficiently small. 
     Hereinafter, the invention will be specifically described with reference to examples. However, the invention is not limited to the following examples, but appropriate changes are available within the scope without changing the spirit thereof. 
     Example 1 
     In Example 1, by using the manufacturing device  11  illustrated in  FIG.  1   , with respect to the surface of the first sheet S 11  where the interval D between the adjacent rods  140  is changed, the difference (0° to 90°) was measured between the number of fiber bundles CF deposited along the conveying direction (set to 0° direction) of the first sheet S 11  and the number of fiber bundles CF deposited along the width direction (set to 90° direction) of the first sheet S 11 . As the absolute value of this difference is smaller, it can be determined that the fiber bundles CF can be uniformly dispersed without directionality. In addition, the conveying speed of the first sheet S 11  in this example was set to 5 m/min. 
     In addition, the inclination angle θ A  of the rod  140  was changed, and the measurement was performed. Table 1 lists a summary of the measurement results. In addition, a graph of the measurement results illustrated in Table 1 is illustrated in  FIG.  17   . 
     
       
         
          TABLE 1
           
               
               
               
               
               
               
               
               
               
               
               
               
            
               
                 D 
                 mm 
                 - 
                 
                   22 
                 
                 
                   22 
                 
                 
                   22 
                 
                 
                   27 
                 
                 
                   27 
                 
                 
                   27 
                 
                 
                   32 
                 
                 
                   32 
                 
                 
                   32 
                 
               
               
                 θ A 
 
                 ° 
                 - 
                 
                   30 
                 
                 
                   25 
                 
                 
                   20 
                 
                 
                   30 
                 
                 
                   25 
                 
                 
                   20 
                 
                 
                   30 
                 
                 
                   25 
                 
                 
                   20 
                 
               
               
                 0° 
                 pixel 
                 115698 
                 105484 
                 103964 
                 98437.1 
                 106109 
                 106531 
                 104140 
                 105739 
                 105387 
                 103257 
               
               
                 90° 
                 pixel 
                 102100 
                 107624 
                 111530 
                 108778 
                 107931 
                 107773 
                 108858 
                 107113 
                 113509 
                 118850 
               
               
                 0° - 90° 
                 pixel 
                 -13598 
                 2140.87 
                 7565.79 
                 10340.5 
                 1822.07 
                 1241.21 
                 4717.69 
                 1374.71 
                 8122.43 
                 15593.1 
               
            
           
         
       
     
     In addition, in this measurement, the average value of the fiber lengths of the fiber bundles CF was 25.4 mm. In this measurement, the fiber bundles CF deposited on the surface of the first sheet S 11  was imaged, the fiber bundles CF deposited along the conveying direction (0° direction) of the first sheet S 11  and the fiber bundles CF deposited in the width direction (90° direction) of the first sheet S 11  were extracted from the obtained image, and the respective numbers (pixels) were counted. In addition, in this measurement, as a comparative example, the same measurement was performed also in the case where the rods  140  were not arranged. In addition, the measurement results are illustrated in Table 1 and the left side of  FIG.  17   . 
     As illustrated in Table 1 and  FIG.  17   , by arranging the plurality of rods  140  under the cutting machine  113 A and adjusting the interval D and the inclination angle θ A , the ratio of the fiber bundles CF deposited along the conveying direction of the first sheet S 11  (0° direction) of the first sheet S 11  and the fiber bundles CF deposited along the width direction (90° direction) of the first sheet S 11  can be changed. 
     It can be understood that, depending on the interval D between the rods  140  and the inclination angle θ A , the proportion of the fiber bundles CF deposited along the width direction (90°) of the first sheet S 11  is increased in comparison with the proportion of the fiber bundles CF deposited along the conveying direction (0° direction) of the first sheet S 11 . In this case, it is possible to increase the proportion of the fiber bundles CF deposited along the conveying direction (0° direction) of the first sheet S 11  by increasing the conveying speed of the above-described first sheet S 11 . 
     Therefore, by adjusting the conveying speed of the first sheet S 11  in addition to the interval D of the rods  140  and the inclination angle θ A , it is possible to change the ratio between the fiber bundles CF deposited along the conveying direction (0° direction) of the first sheet S 11  and the fiber bundles CF deposited along the width direction (90° direction) of the first sheet S 11 . 
     Example 2 
     In Example 2, an SMC was manufactured in the same manner as Example 1 except that the manufacturing device  11  illustrated in  FIG.  1    is used to change the conditions such as the interval D between the adjacent rods  140  to the conditions illustrated in the following Table 2. In addition, in this example, the conveying speed of the first sheet S 11  was set to 5 m/min. 
     As the fiber bundle CF, a carbon fiber (product name: TR50S15L) produced by Mitsubishi Rayon Co., Ltd. was used. A paste P 1  was prepared as follows. 
     With respect to 100 parts by mass of epoxy acrylate resin as a thermosetting resin (product name: Neopol 8051, produced by Nippon Yupika), 0.5 parts by mass of a 75% solution of 1,1-di(t-butylperoxy) cyclohexane (product name: Perhexa C-75 (EB), produced by NOF CORPORATION) and 0.5 parts by mass of a 74% solution of t-butyl peroxyisopropyl carbonate (product name: Kayacarbon BIC-75, produced by Kayaku Akzo Co., Ltd.) were added as a curing agent, 0.35 parts by mass of a phosphoric acid ester-based derivative composition (product name: MOLD WIZ INT-EQ-6, produced by Axel Plastic Research Laboratory Co., Ltd.) was added as an internal mold releasing agent, 15.5 parts by mass of modified diphenylmethane diisocyanate (product name: Cosmonate LL, produced by Mitsui Chemicals, Inc.) was added as a viscous agent, 0.02 parts by mass of 1,4-benzoquinone was added as a stabilizing agent, 5 parts by mass of milled carbon fiber (trade name: MP30X, weight average fiber length being 95 µm, content of fiber of 350 µm or less being 99% by mass, produced by Nippon Polymer Industry Co., Ltd.) were added, and these were sufficiently mixed and stirred to obtain the paste P 1 . 
     Then, the molded plate obtained by molding the manufactured SMC (content of the fiber bundle CF: 49% by mass) was evaluated for the strength (bending strength, bending modulus of elasticity). 
     Specifically, in the evaluation test, first, the SMCs were manufactured for the case where the rods  140  were not arranged (Comparative Example 1), the case where the interval D between the rods  140  was 32 mm and the inclination angle θ A  was 15° (Example 1), and the case where the interval D between the rods  140  was 32 mm and the inclination angle θ A  was 25° (Example 2). 
     Next, after the SMC was cured for one week at a temperature of 25 ± 5° C. after manufacturing of the SMC, in a panel forming mold (300 mm × 300 mm × 2 mm, surface chrome plating finishing) having a fitting portion at the end, the SMC was cut in unit of 230 mm × 230 mm, the conveying directions (MD directions) of the SMC in the SMC manufacturing device were aligned, and two sheets thereof were placed into the center of the mold. Then, the SMC was heated and pressed in the mold under the conditions of 140° C., 8 MPa, and 5 minutes, so that the SMC molded plate was obtained. In addition, two sheets of SMC having a weight of about 150 g of two SMCs were laminated in the same direction to have a weight of about 300 g. 
     Next, in order to measure the bending strength and the bending modulus of elasticity of the SMC molded plate, in accordance with the arrangement illustrated in  FIG.  19   , six test pieces each having a length of 110 mm and a width of 25 mm were cut out from the SMC molded plate along the SMC conveying direction (0° direction) and the SMC width direction (90 ° direction). Then, by using a 5 kN Instron universal testing machine, a three-point bending test was performed on each test piece at L/D = 40 and a crosshead speed of 5 mm/min, and the bending strength and bending modulus of elasticity of each test piece were measured, and the respective average values thereof was obtained. In addition, the difference (0° - 90°) and the ratio (0°/90°) were calculated. Table 2 lists a summary of the evaluation results. In addition, a graph of the measurement results illustrated in Table 2 is illustrated in Fig. 
     
       
         
          TABLE 2
           
               
               
               
               
               
             
               
                   
                 Unit 
                 Comparative Example 1 
                 Example 1 
                 Example 2 
               
             
            
               
                 D 
                 mm 
                 - 
                 32 
                 32 
               
               
                 θ A 
 
                 ° 
                 - 
                 15 
                 25 
               
               
                 0° bending modulus of elasticity ① 
                 GPa 
                 24.1 
                 21.5 
                 23.5 
               
               
                 0° bending strength ③ 
                 MPa 
                 288.6 
                 261.9 
                 316.0 
               
               
                 90° bending modulus of elasticity ② 
                 GPa 
                 20.0 
                 20.4 
                 24.2 
               
               
                 90° bending strength ④ 
                 MPa 
                 271.6 
                 295.0 
                 323.9 
               
               
                 ① - ② 
                 - 
                 4.1 
                 1.1 
                 -0.7 
               
               
                 ①/② 
                 - 
                 1.21 
                 1.05 
                 0.97 
               
            
           
         
       
     
     As illustrated in Table 2 and  FIG.  18   , in the case where the rods  140  are arranged, it is understood that the directionality of the strength (bending strength, bending modulus of elasticity) of the manufactured SMC is smaller than the case where the rods  140  are not arranged. It can be clarified From these facts that, in the case where the rods  140  are arranged, it is possible to uniformly disperse the fiber bundles without directionality. 
     Example 3 
     In Example 3, in the SMC manufacturing device, the interval D of the rods  140  was set to 32 mm, the angle θ A  of the rods  140  was set to 25°, the conveying speed of the first sheet S 11  was set to 3 m/min, and the SMC (content of the fiber bundle CF being 53% by mass) was prepared in the same manner as in Example 2 except that the milled carbon fiber was not added. 
     By using the SMC, a SMC molded plate was obtained in the same manner as in Example 2. Bending test pieces were cut out in the same manner as in Example 2, and a bending test was performed in the same manner as in Example 2. However, the test conditions in Example 3 are as illustrated in the following Table 3. 
     
       
         
          TABLE 3
           
               
               
               
               
             
               
                 Item 
                 Example 2 Bending Test 
                 Example 3 Bending Test 
               
             
            
               
                 Shape of Test Piece 
                 Thickness 
                 2 ply Laminated (2.1 mm) 
                 2 ply Laminated (2.1 mm) 
               
               
                 Width 
                 25 mm 
                 25 mm 
               
               
                 Length 
                 110 mm 
                 60 mm 
               
               
                 Test Condition 
                 Pressed Surface 
                 Non-Knock-Pin Surface 
                 Non-Knock-Pin Surface 
               
               
                 Inter-Point Distance 
                 40 Times Average Thickness 
                 16 Times Average Thickness 
               
               
                 Indenter Radius 
                 R5 
                 R5 
               
               
                 Point Radium 
                 R3.2 
                 R3.2 
               
               
                 Test Speed 
                 5 mm/min 
                 2.6 mm./min 
               
               
                 Number of Times of Measurement 
                 Conveying Direction 6/Width Direction 6 
                 Each 6 
               
               
                 Cushion Material 
                 Teflon Film 3 Sheets (Nittoflon Film Product No.) 
                 Teflon Film 4 Sheets 
               
            
           
         
       
     
     In addition, in order to measure the tensile strength and the tensile modulus of elasticity of the SMC molded plate, in accordance with the arrangement illustrated in  FIG.  20 A  and  FIG.  20 B , six test pieces illustrated in  FIG.  21    were cut out from the SMC molded plate along the SMC conveying direction (0° direction) and width direction (90° direction). Then, by using a 100 kN Instron universal testing machine, a tensile test was carried out under the test conditions in Table 4 below. 
     
       
         
          TABLE 4
           
               
               
               
             
               
                 Item 
                 0° Tensile-90° Tensile 
               
             
            
               
                 Shape of Test Piece 
                 Thickness 
                 2 ply Laminated (2.1 mm) 
               
               
                 Width 
                 25 mm 
               
               
                 Length 
                 250 mm 
               
               
                 Shape 
                 Dumbbell 
               
               
                 Test Condition 
                 Distortion Gauge 
                 Single Axis 20 mm 
               
               
                 Test Speed 
                 2.6 mm./min 
               
               
                 Number of Times of Measurement 
                 Each 6 
               
            
           
         
       
     
     The summary of the obtained evaluation results is listed in Table 5 and Table 6 as follow. In addition, with respect to the test in the direction of 90°, the measurement temperature was changed and was illustrated in the same tables. 
     
       
         
          TABLE 5
           
               
               
               
               
               
               
               
             
               
                 Example 3 Bending Test 
               
             
            
               
                 Measurement Angle 
                 90° 
                 0° 
                 90° 
                 90° 
                 90° 
               
               
                 Measurement Temperature (°C) 
                 -40 
                 23 
                 23 
                 90 
                 120 
               
               
                 Strength (MPa) 
                 1 
                 409 
                 526 
                 324 
                 433 
                 252 
               
               
                 2 
                 506 
                 526 
                 350 
                 402 
                 210 
               
               
                 3 
                 353 
                 426 
                 461 
                 277 
                 252 
               
               
                 4 
                 425 
                 286 
                 500 
                 387 
                 295 
               
               
                 5 
                 447 
                 483 
                 447 
                 408 
                 256 
               
               
                 6 
                 314 
                 323 
                 463 
                 393 
                 219 
               
               
                 Average 
                 409 
                 428 
                 424 
                 383 
                 247 
               
               
                 Standard Deviation 
                 68.2 
                 103.4 
                 70.2 
                 54.5 
                 30.3 
               
               
                 CV (%) 
                 17% 
                 24% 
                 17% 
                 14% 
                 12% 
               
               
                 max 
                 506 
                 526 
                 500 
                 433 
                 295 
               
               
                 Difference 
                 97 
                 98 
                 76 
                 50 
                 48 
               
               
                 min 
                 314 
                 286 
                 324 
                 277 
                 210 
               
               
                 Difference 
                 95 
                 142 
                 100 
                 106 
                 37 
               
               
                 Modulus of Elasticity (GPa) 
                 1 
                 22.3 
                 23.5 
                 17.1 
                 21.0 
                 16.3 
               
               
                 2 
                 22.1 
                 23.2 
                 21.1 
                 19.1 
                 12.4 
               
               
                 3 
                 21.5 
                 17.9 
                 22.2 
                 16.3 
                 15.2 
               
               
                 4 
                 24.7 
                 21.8 
                 21.7 
                 19.7 
                 17.5 
               
               
                 5 
                 22.9 
                 21.8 
                 23.0 
                 22.3 
                 16.4 
               
               
                 6 
                 21.3 
                 18.8 
                 21.3 
                 22.2 
                 13.7 
               
               
                 Average 
                 22.5 
                 21.2 
                 21.1 
                 20.1 
                 15.3 
               
               
                 Standard Deviation 
                 1.24 
                 2.31 
                 2.06 
                 2.27 
                 1.90 
               
               
                 CV (%) 
                 5% 
                 11% 
                 10% 
                 11% 
                 12% 
               
               
                 max 
                 24.7 
                 23.5 
                 23.0 
                 22.3 
                 17.5 
               
               
                 Difference 
                 2.2 
                 2.3 
                 1.9 
                 2.2 
                 2.3 
               
               
                 min 
                 21.3 
                 17.9 
                 17.1 
                 16.3 
                 12.4 
               
               
                 Difference 
                 1.2 
                 3.3 
                 4.0 
                 3.8 
                 2.9 
               
            
           
         
       
     
     
       
         
          TABLE 6
           
               
               
               
               
               
               
               
             
               
                 Example 3Tensile Test 
               
             
            
               
                 Measurement Angle 
                 90° 
                 0° 
                 90° 
                 90° 
                 90° 
               
               
                 Measurement Temperature (°C) 
                 -40 
                 23 
                 23 
                 90 
                 120 
               
               
                 Strength (MPa) 
                 1 
                 193 
                 134 
                 131 
                 152 
                 129 
               
               
                 2 
                 151 
                 193 
                 158 
                 117 
                 109 
               
               
                 3 
                 119 
                 147 
                 175 
                 142 
                 98 
               
               
                 4 
                 214 
                 195 
                 180 
                 105 
                 63 
               
               
                 5 
                 169 
                 182 
                 140 
                 150 
                 92 
               
               
                 6 
                 159 
                 131 
                 173 
                 119 
                 143 
               
               
                 Average 
                 168 
                 164 
                 160 
                 131 
                 106 
               
               
                 Standard Deviation 
                 33.2 
                 29.7 
                 20.2 
                 19.7 
                 28.2 
               
               
                 CV (%) 
                 20% 
                 18% 
                 13% 
                 15% 
                 27% 
               
               
                 max 
                 214 
                 195 
                 180 
                 152 
                 143 
               
               
                 Difference 
                 47 
                 31 
                 21 
                 21 
                 37 
               
               
                 min 
                 119 
                 131 
                 131 
                 105 
                 63 
               
               
                 Difference 
                 49 
                 33 
                 29 
                 26 
                 43 
               
               
                 Modulus of Elasticity (GPa) 
                 1 
                 34.7 
                 27.3 
                 27.2 
                 27.6 
                 24.6 
               
               
                 2 
                 28.1 
                 25.4 
                 29.8 
                 32.2 
                 30.6 
               
               
                 3 
                 25.0 
                 35.2 
                 30.1 
                 32.3 
                 26.3 
               
               
                 4 
                 33.6 
                 31.4 
                 32.9 
                 20.4 
                 24.6 
               
               
                 5 
                 33.4 
                 27.5 
                 28.6 
                 33.8 
                 25.6 
               
               
                 6 
                 31.2 
                 37.7 
                 26.7 
                 30.8 
                 33.4 
               
               
                 Average 
                 31.0 
                 30.8 
                 29.2 
                 29.5 
                 27.5 
               
               
                 Standard Deviation 
                 3.76 
                 4.89 
                 2.26 
                 4.93 
                 3.64 
               
               
                 CV (%) 
                 12% 
                 16% 
                 8% 
                 17% 
                 13% 
               
               
                 max 
                 34.7 
                 37.7 
                 32.9 
                 33.8 
                 33.4 
               
               
                 Difference 
                 3.7 
                 7.0 
                 3.7 
                 4.3 
                 5.9 
               
               
                 min 
                 25.0 
                 25.4 
                 26.7 
                 20.4 
                 24.6 
               
               
                 Difference 
                 6.0 
                 5.4 
                 2.5 
                 9.1 
                 2.9 
               
            
           
         
       
     
     The standard deviation and the CV (coefficient of variation) in Table 5 and Table 6 were calculated by using the following Mathematical Formula.  
     
       
         
           
             
               
                 Standard 
                   
                 Deviation 
                   
                 CV 
                   
                 
                   
                     Coefficient 
                       
                     of 
                     ​ 
                       
                     Variation 
                   
                 
               
             
             
               
                 
                   
                       
                       
                       
                       
                       
                       
                       
                       
                       
                       
                       
                       
                       
                       
                       
                       
                       
                     
                       x 
                       ¯ 
                     
                     = 
                     
                       
                         
                           
                             ∑ 
                             
                               i 
                               = 
                               1 
                             
                             n 
                           
                           
                             
                               x 
                               i 
                             
                           
                         
                       
                     
                   
                   / 
                   n 
                 
               
             
           
         
       
     
     
       
         
           
             
               S 
               
                 n 
                 − 
                 1 
               
             
             = 
             
               
                 
                   
                     
                       
                         
                           
                             ∑ 
                             
                               i 
                               = 
                               1 
                             
                             n 
                           
                           
                             
                               x 
                               i 
                               2 
                             
                             − 
                             n 
                             
                               
                                 x 
                                 ¯ 
                               
                               2 
                             
                           
                         
                       
                     
                   
                   / 
                   
                     
                       
                         n 
                         − 
                         1 
                       
                     
                   
                 
               
             
           
         
       
     
     
       
         
           
             
               
                 C 
                 V 
                 = 
                 100 
                 × 
                 
                   S 
                   
                     n 
                     − 
                     1 
                   
                 
               
               / 
               
                 x 
                 ¯ 
               
             
           
         
       
     
      where:
       = sample mean (average);   S n-1  = sample standard deviation;   CV = sample coefficient of variation, in percent;   n = number of specimens; and   x i  = measured or derived property.   

     As illustrated in Tables 5 and 6, it is clarified that, when the longitudinal direction of the SMC is set to the 0° direction and the width direction is set to the 90° direction, in the SMC of which the ratio (0° bending modulus of elasticity/90° bending modulus of elasticity) of the bending moduli of elasticity [GPa] in the respective directions is in a range of 0.8 to 1.2 and any one of the coefficients of variation (CV) of the bending moduli of elasticity (the CV [%] of the 0° bending modulus of elasticity and the CV [%] of the 90° bending modulus of elasticity) is in a range of 5 to 15, the directionality of the strength (bending strength, bending modulus of elasticity) is small, and the strength can be maintained to be more uniform in all directions. Namely, as illustrated in Example 3, the SMC was excellent in the flowability of the resin at the time of a molding process, and the anisotropy and the irregularity of the physical properties of the molded article were reduced. 
     Experimental Example A 1   
     As the first light irradiation means and the second light irradiation means, bar-shaped LED lights (White Bar 132-15, Light: CA-DBW13, Diffusion Plate: OP-42282, produced by Keyence Corporation) were prepared. As the imaging means, a digital double speed monochrome camera (XG-035M, produced by Keyence Corporation) and a high resolution/low distortion lens 16 mm (CA-LH 16) were prepared. As the orientation determination means, a high-speed and flexible image processing system (Controller: XG-7000, Illumination Extension Unit: CA-DC 21E, produced by Keyence Corporation) was prepared. 
     A carbon fiber bundle (trade name “TR50S15L”, produced by Mitsubishi Rayon Co., Ltd.) was cut so that the average fiber length was 25.4 mm, a plurality of carbon fiber bundles were arranged so that the fiber axis direction was aligned in one direction, and a sheet-shaped test fiber bundle group having a rectangular shape of 100 mm (length) x 100 mm (width) as viewed in a plan view was manufactured. A pair of first light irradiation means and a pair of second light irradiation means were arranged around the test fiber bundle group so that the test fiber bundle group was irradiated with light obliquely from the upper side at an angle of 45°. At this time, the longitudinal direction of the pair of first light irradiation means and the fiber axis direction of the fiber bundle in the test fiber bundle group were set to be parallel to each other, and the longitudinal direction of the pair of second light irradiation means and the fiber axis direction of the fiber bundle in the test fiber bundle group were set to be perpendicular to each other. The fiber axis direction of the fiber bundle in the test fiber bundle group in this state was set to 0°. 
     The imaging means was installed above the center of the test fiber bundle group. The still image of the upper surface of the test fiber bundle group was captured by the imaging means while the test fiber bundle group was irradiated with light by the first light irradiation means, and the orientation determination means measured the luminance on the upper surface of the test fiber bundle group. Subsequently, the test fiber bundle group was rotated by 90° in increment of 5°, the still image in the state of being irradiated with light by the first light irradiation means in the fiber axis direction of the fiber bundle at each angle was similarly captured, and the luminance was measured. Next, the irradiation of the light by the first light irradiation means was stopped, the test fiber bundle group was irradiated with light by the second light irradiation means, and the luminance of the upper surface of the test fiber bundle group of which the fiber axis direction of the fiber bundles is 90° was measured. Subsequently, the test fiber bundle group was rotated to 0° in increments of 5°, the still image in the state of being irradiated with light by the second light irradiation means in the fiber axis direction of the fiber bundle at each angle was similarly captured, and the luminance was measured.  FIG.  22    illustrates the measurement results of the luminance in the test fiber bundle group in the fiber axis direction of the fiber bundle of each angle. 
     As illustrated in  FIG.  22   , in the irradiation of the light by the first light irradiation means for irradiating light obliquely from the upper side in a direction perpendicular to the fiber bundle of which the fiber axis direction was 0° as viewed in a plan view, as the fiber bundle in the fiber axis direction was closer to 0°, the area of the bright portiondue to the reflected light was increased in the test fiber bundle group in the still image, and the luminance was increased. On the other hand, in the irradiation of the light by the second light irradiation means for irradiating light obliquely from the upper side in a direction perpendicular to the fiber bundle of which the fiber axis direction was 90° as viewed in a plan view, as the fiber axis direction of the fiber bundle is close to 90°, the area of the bright portion due to the reflected light was increased in the test fiber bundle group in the still image, and the luminance was increased. In addition, when the fiber axis direction of the fiber bundle was in a range of 30 to 60°, the luminance was extremely small with respect to any light irradiation of the first light irradiation means and the second light irradiation means. 
     Example A 1   
     A fiber-reinforced resin material was manufactured by the manufacturing device  21  exemplified in  FIG.  15   . As the elongated fiber bundle f, a carbon fiber bundle (trade name “TR50S15L”, produced by Mitsubishi Rayon Co., Ltd.) was used. A paste P 21  was prepared as follows. With respect to 100 parts by mass of epoxy acrylate resin as a thermosetting resin (product name: Neopol 8051, produced by Nippon Yupika), 0.5 parts by mass of a 75% solution of 1,1-di(t-butylperoxy) cyclohexane (product name: Perhexa C-75 (EB), produced by NOF CORPORATION) and 0.5 parts by mass of a 74% solution of t-butyl peroxyisopropyl carbonate (product name: Kayacarbon BIC-75, produced by Kayaku Akzo Co., Ltd.) were added as a curing agent, 0.35 parts by mass of a phosphoric acid ester-based derivative composition (product name: MOLD WIZ INT-EQ-6, produced by Axel Plastic Research Laboratory Co., Ltd.) was added as an internal mold releasing agent, 15.5 parts by mass of modified diphenylmethane diisocyanate (product name: Cosmonate LL, produced by Mitsui Chemicals, Inc.) was added as a viscous agent, 0.02 parts by mass of 1,4-benzoquinone was added as a stabilizing agent, 5 parts by mass of milled carbon fiber (trade name: MP30X, weight average fiber length being 95 µm, content of fiber of 350 µm or less being 99% by mass, produced by Nippon Polymer Industry Co., Ltd.) were added, and these were sufficiently mixed and stirred to obtain the paste P 21 . 
     In the inspection device  2100 , a pair of bar-shaped LED lights (white bar 132-15, light: CA-DBW13, Diffusion Plate: OP-42282, produced by Keyence Corporation) were used. In addition, the same units as the first irradiation unit  2102   a  and the second irradiation unit  2102   b  were prepared as the third irradiation unit  2104   a  and the fourth irradiation unit  2104   b  of the second light irradiation means  2104 . As the imaging means  2106 , a digital double-speed monochrome camera (XG-035M, produced by Keyence Corporation) and a high resolution/low distortion lens 16 mm (CA-LH16) were used. As the orientation determination means  2108 , a high-speed and flexible image processing system (controller: XG-7000, Illumination Extension Unit: CA-DC  21 E, produced by Keyence Corporation) was used. The inclination angle ϕ 1  of the first irradiation unit  2102   a  with respect to the horizontal direction, the inclination angle ϕ 2  of the second irradiation unit  2102   b  with respect to the horizontal direction, the inclination angle θ 1  of the third irradiation unit  2104   a  with respect to the horizontal direction, and the inclination angle θ 2  of the fourth irradiation unit  2104   b  with respect to the horizontal direction were set to 45°. 
     In manufacturing the fiber-reinforced resin material, a first resin sheet S 21  having a thickness of 0.5 mm was formed, and the fiber bundle f was cut with a cutting machine  213 A to drop fiber bundles f having an average fiber length of 25.4 mm, and a sheet-shaped fiber bundle group F 2  having a thickness of 1.0 mm was formed. The conveying speed of the first sheet S 21  and the running speed (the speed of the conveyor  223 ) of the paste P 21  applied on the first sheet S 21  were 5 m/min. In addition, as the rods  240 , the plurality of rods having a diameter of 3.0 mm were arranged side by side in parallel to the conveying direction of the first sheet S 21 . The interval between adjacent rods  240  was set to 35 mm. The inclination angle α of the rods  240  with respect to the horizontal direction was set to 25°. 
     During manufacturing, in the inspection device  2100 , with respect to a rectangular area of 100 mm × 100 mm as viewed in a plan view of the upper surface of the fiber bundle group F 2 , the luminance in the state of being irradiated with light by the first light irradiation means  2102  and the luminance in the state of being irradiated with light by the second light irradiation means  2104  were measured. The luminance ratio of the luminance in the state of being irradiated with light by the first light irradiation means  2102  to the luminance in the state of being irradiated with light by the second light irradiation means  2104  was 1.2. Subsequently, the running speed of the first resin sheet (the speed of the conveyor  223 ) was reduced to 1.5 m/min and again the luminance ratio was calculated to be 0.95. The results are illustrated in  FIG.  23   . In addition, the speed at which the fiber bundle f is supplied to the cutting machine  213 A and the cutting speed of the cutting machine  213 A were adjusted in accordance with the deceleration of the conveying speed of the first sheet S 21  and the running speed of the paste P 21  (the speed of the conveyor  23 ) so that the thickness of the fiber bundle group F 2  does not change. 
     In this manner, by determining the fiber orientation state of the fiber bundle group F 2  from the luminance ratio on the production line and changing the conveying speed of the first sheet S 21 , the fiber bundle group F 2  with a more random fiber orientation state was formed. 
     Measurement of Roughness Β 
     The roughness β was measured by the following method. 
     After the fiber-reinforced resin material (SMC) was cured for one week at a temperature of 25 ± 5° C. after manufacturing, two pieces of the cured SMC were cut out with a rolling cutter in a size of a length of 300 mm and a width of 300 mm, and the two pieces are laminated so that the longitudinal directions of the two pieces of SMC having a weight of about 250 g were the same. Based on the center of the cut material having a weight of about 500 g, 25 test pieces having a size of a length of 15 mm and a width of 15 mm were cut out at intervals of 30 mm from the left and right two columns and the upper and lower two columns. 
     Next, by using an X-ray apparatus, the test piece was rotated about the thickness direction thereof while the test piece was irradiated with X-rays by a transmission method, and a diffracted X-ray was obtained by a detector arranged at a diffraction angle 2θ = 25.4°, so that the luminance (I(ϕ i )) at an i-th rotation angle (ϕ i ) was measured. However, I(ϕ i ) is assumed to be normalized so that the integration strength becomes 10000. 
     In measuring the roughness β, Empyrean produced by PANalytical Co. was used as an X-ray diffraction apparatus, the tube voltage was set to 45 kV, and the tube current was set to 40 mA. In addition, double cross slits were attached to the incident side, and the vertical and horizontal widths of the upstream and downstream slits were all set to 2 mm. Furthermore, a parallel plate collimator was attached to the light receiving side, and a proportional counter was attached to the detector. Crystal orientation of the test piece was evaluated by acquiring measurement data at intervals of 0.04 degrees. 
     The above measurement conditions are merely exemplary ones, and the measurement conditions can be appropriately changed within a range where the purpose of the measurement of the roughness β does not change. 
     Subsequently, f(ϕ i ) was calculated from the measured I(ϕ i ) by Mathematical Formula (2), and the roughness β was obtained as an average value of the measured values of 25 test pieces by using Mathematical Formula (1). 
     Measurement of Average Value and Standard Deviation of Fiber Orientation F a   
     The luminance (I(ϕ i )) was measured for 25 test pieces in the same manner as the measurement method of roughness β. However, I(ϕ i ) is assumed to be normalized so that the integration strength becomes 10000. Then, by using the measured I(ϕ i ), the orientation coefficient “a” was obtained for each of the 25 test pieces by Mathematical Formula (5). Furthermore, by using the obtained orientation coefficient “a”, the degree of crystal orientation f a  was obtained for each of the 25 test pieces by Mathematical Formula (4), and the average value and standard deviation thereof were calculated. 
     Example B 1   
     An SMC was manufactured in the same manner as in Example 3 described above. The roughness β of the obtained SMC was 3.7, and the sum of the average value and the standard deviation of the degree of fiber orientation f a  was 0.11. As also illustrated in Example 3 described above, the SMC was excellent in the flowability of the resin at the time of a molding process, and the anisotropy and the irregularity of the physical properties of the molded article were reduced. 
     Comparative Example B 1   
     An SMC was manufactured in the same manner as in Example 3 except that the rotating drum described in JP 2000-17557 A was used instead of the rods  140 . The roughness β of the obtained SMC was 5.7, and the sum of the average value and the standard deviation of the degree of fiber orientation f a  was 0.20. 
     In addition, the ratio of the bending moduli of elasticity (0° bending modulus of elasticity/90° bending modulus of elasticity) of the molded plate of this SMC, measured in the same manner as in Example 3, was 1.35, and the coefficient of variation (CV) of the 0° bending modulus of elasticity is 15%, the coefficient of variation (CV) of the 90° bending modulus of elasticity was 7%, and the anisotropy of the physical properties of the molded plate was large. 
     Comparative Example B 2   
     With Respect to CF-SMC (AMCTM 8590 BK) Produced by Quantum 
     Composites, the roughness β and the sum of the average value and standard deviation of the degree of fiber orientation f a  were measured. The roughness β was 5.7, and the sum of the average value and the standard deviation of the degree of fiber orientation f a  was 0.20. 
     In addition, the ratio of the bending moduli of elasticity (0° bending modulus of elasticity/90° bending modulus of elasticity) of the molded plate of this SMC, measured in the same manner as in Example 3, was 1.49, and the coefficient of variation (CV) of the 0° bending modulus of elasticity and the coefficient of variation (CV) of the 90° bending modulus of elasticity were 14.4% and 10.9%, respectively, and the anisotropy of the physical properties of the molded plate was large. 
     
       
         
           
               
               
             
               
                 EXPLANATIONS OF LETTERS OR NUMERALS 
               
             
            
               
                   11 ,  21   
                 manufacturing device of fiber-reinforced resin materia 
               
               
                   110 ,  210   
                 fiber bundle supply unit 
               
               
                   111 ,  211   
                 first sheet supply unit 
               
               
                   112 ,  212   
                 first coating unit 
               
               
                   113 ,  213   
                 cutting unit 
               
               
                   113 A,  213 A 
                 cutting machine 
               
               
                   114 ,  214   
                 second sheet supply unit 
               
               
                   115 ,  215   
                 second coating unit 
               
               
                   116 ,  216   
                 impregnation unit 
               
               
                   119 ,  219   
                 first conveying unit 
               
               
                   128 ,  228   
                 second conveying unit 
               
               
                   131 ,  231   
                 bonding mechanism 
               
               
                   132 ,  232   
                 pressing mechanism 
               
               
                 CF, f′, f 
                 fiber bundle 
               
               
                 P 1 , P 2 , P 21 
 
                 paste (thermosetting resin) 
               
               
                 S 11 , S 21 
 
                 first sheet 
               
               
                 S 12 , S 22 
 
                 second sheet 
               
               
                 S 13 , S 23 
 
                 bonding sheet 
               
               
                 R 1 , R 2 
 
                 raw fabric of SMC (fiber-reinforced resin material) 
               
               
                   140 , 240   
                 rod 
               
               
                 
                   2100 
                 
                 inspection device 
               
               
                 
                   2102 
                 
                 first light irradiation means 
               
               
                 
                   2104 
                 
                 second light irradiation means 
               
               
                 
                   2106 
                 
                 imaging means 
               
               
                 
                   2108 
                 
                 orientation determination means 
               
               
                 
                   2200 
                 
                 control means