Patent Publication Number: US-2023150739-A1

Title: Building board package and method for manufacturing building board package

Description:
TECHNICAL FIELD 
     The present invention relates to a building board package, and a method for manufacturing the building board package. 
     BACKGROUND ART 
     For example, inorganic boards such as a ceramic siding board and a ceramic board are used as building boards constituting exterior walls and interior walls of buildings. To install a wall portion using building boards, a plurality of building boards are joined together in a vertical direction and a horizontal direction. Frequently, such building boards are packed into packages each including a predetermined number of building boards, and the packages are transported and stored while being stacked on a transport pallet. As for a technique relating to packaging of such building boards, for example, Patent Document 1 below describes protecting the surface of a coating film of a building board by a thin sheet, called a packing sheet. 
     CITATION LIST 
     Patent Document 
     
         
         Patent Document 1: JP 2005-41546A 
       
    
     SUMMARY OF INVENTION 
     Technical Problem 
     A building board may have coating applied to its design surface. When a coating film on the coated surface of a building board to which coating has been applied is pressed, the texture of the surface of the coating film may change at the pressed portion, thus generating a new gloss (i.e., the pressed portion may have a net outside light reflectance higher than that of an unpressed portion adjacent thereto). This is presumably because, on the surface of the coating film, a microscopic roughness profile corresponding to a predetermined texture is microscopically deformed (planarized) through pressing. For building boards and building board packages (hereinafter abbreviated as packages) that are stacked in multiple tiers on a transport pallet, an unintended new gloss on a coating film is likely to be particularly generated in a building board that is located in the lowermost tier and is subjected to the greatest load. 
     When a building board in which the above-described gloss resulting from pressing of the coating film is included in building boards constituting an exterior wall or an interior wall, the gloss may become noticeable depending on the irradiation angle of irradiation light such as sunlight and illumination light, thus impairing the appearance of the exterior wall or the interior wall. In particular, when the coating film on the surface of the building board is a matte coating film, the above-described unintended gloss is likely to be noticeable, and may impair the appearance of the exterior wall or the interior wall. 
     The present invention has been conceived under the above-described circumstances, and an object thereof is to provide a package suitable to suppress generation of a gloss that could be caused as a result of pressing a coating film on the surface of a building board, and a method for manufacturing the package. 
     Solution to Problem 
     According to a first aspect of the present invention, a package is provided. The package includes a first building board, and a packing sheet stacked on top of the first building board. The first building board has a first surface including a first coating film surface, and a second surface opposite the first surface. The packing sheet has a third surface on the first building board side, and a fourth surface opposite the third surface. The third surface is in contact with the first coating film surface. An absolute value of a difference between a 60-degree gloss value of the first coating film surface and a 60-degree gloss value of the third surface is 3.0 or less, and an absolute value of a difference between an 85-degree gloss value of the first coating film surface and an 85-degree gloss value of the third surface is 3.0 or less. 
     In the present package, the first coating film surface and the third surface that are in contact with each other have microscopic roughness profiles corresponding to their respective glosses. The further the values of both a difference in gloss value between the first coating film surface and the third surface when measuring a gloss value at a relatively small incident angle of 60 degrees in a gloss value measurement, and a difference in gloss value between the first coating film surface and the third surface when measuring a gloss value at a relatively large incident angle of 85 degrees in a gloss value measurement are below 3.0, the more closely the microscopic roughness profile of the first coating film surface and the microscopic roughness profile of the third surface resemble each other. 
     For such a package, even if the first coating film surface of the first building board is pressed by the third surface of the packing sheet and deformed microscopically, the deformation is caused by the microscopic roughness profile of the third surface that resembles the pre-deformation microscopic roughness profile of the pressed portion (e.g., the microscopic roughness profile of the third surface is transferred to the first coating film surface). Therefore, at the pressed portion of the first coating film surface, the change in texture is suppressed and a new gloss is less likely to be generated. 
     As described thus far, the package according to the first aspect of the present invention is suitable to suppress generation of a gloss that could be caused as a result of pressing a coating film on a surface of a building board. 
     Preferably, the package according to the present invention further includes a second building board stacked on top of the first building board with the packing sheet interposed between the second building board and the first building board. The second building board has a fifth surface on the first building board side, and a sixth surface opposite the fifth surface. The fifth surface includes a second coating film surface. The fourth surface of the packing sheet on the second building board side is in contact with the second coating film surface. An absolute value of a difference between a 60-degree gloss value of the second coating film surface and a 60-degree gloss value of the fourth surface is 3.0 or less, and an absolute value of a difference between an 85-degree gloss value of the second coating film surface and an 85-degree gloss value of the fourth surface is 3.0 or less. 
     In such a configuration, the second coating film surface and the fourth surface that are in contact with each other in the second building board and the packing sheet have microscopic roughness profiles corresponding to their respective glosses. The further the values of both a difference in gloss value between the second coating film surface and the fourth surface when measuring a gloss value at a relatively small incident angle of 60 degrees in a gloss value measurement, and a difference in gloss value between the second coating film surface and the fourth surface when measuring a gloss value at a relatively large incident angle of 85 degrees in a gloss value measurement are below 3.0, the more closely the microscopic roughness profile of the second coating film surface and the microscopic roughness profile of the fourth surface resemble each other. For such a package, even if the second coating film surface of the second building board is pressed by the fourth surface of the packing sheet and deformed microscopically, the deformation is caused as a result of the microscopic roughness profile of the fourth surface that resembles the pre-deformation microscopic roughness profile of the pressed portion being transferred to the second coating film surface, for example. Therefore, at the pressed portion of the second coating film surface, the change in texture is suppressed and a new gloss is less likely to be generated. 
     In a preferred mode of the first aspect according to the present invention, the third surface of the packing sheet has a roughness profile in which a plurality of minute protrusions protruding to the first building board side are uniformly disposed. The configuration in which the minute protrusions are uniformly disposed on the third surface of the packing sheet is suitable for the minute protrusions to uniformly come into point contact with the first coating film of the first building board, and is suitable to efficiently disperse a pressing force applied when the first coating film surface of the first building board is pressed by the third surface of the packing sheet. Therefore, the configuration is suitable to suppress deformation of the pressed portion. Furthermore, all portions of the third surface of the packing sheet have a roughness profile that resembles the microscopic roughness profile of the first coating film surface of the first building board. Accordingly, even if the first coating film surface of the first building board is pressed by the third surface of the packing sheet and deformed microscopically, the deformation is caused as a result of the microscopic roughness profile of the third surface that resembles the pre-deformation microscopic roughness profile of the pressed portion being transferred to the first coating film surface, for example. Therefore, at the pressed portion of the first coating film surface, the change in texture is suppressed and a new gloss is less likely to be generated. 
     In a preferred mode of the first aspect according to the present invention, the third surface of the packing sheet has a roughness profile in which a plurality of minute protrusions protruding to the first building board side are uniformly disposed, and the fourth surface has a roughness profile in which a plurality of minute recesses are disposed at positions respectively corresponding to the plurality of minute protrusions. The configuration in which the minute protrusions are uniformly disposed on the third surface of the packing sheet is suitable for the minute protrusions to uniformly come into point contact with the first coating film of the first building board, and is suitable to efficiently disperse a pressing force applied when the first coating film surface of the first building board is pressed by the third surface of the packing sheet. Therefore, the configuration is suitable to suppress deformation of the pressed portion. In addition, the configuration in which the minute protrusions are uniformly disposed on the fourth surface of the packing sheet is suitable for the fourth surface of the packing sheet to uniformly come into point contact with the second coating film of the second building board, and is suitable to efficiently disperse a pressing force applied when the second coating film surface of the second building board is pressed by the fourth surface of the packing sheet. Therefore, the configuration is suitable to suppress deformation of the pressed portion. Furthermore, all portions of the third surface of the packing sheet have a roughness profile that resembles the microscopic roughness profile of the first coating film surface of the first building board. Accordingly, even if the first coating film surface of the first building board is pressed by the third surface of the packing sheet and deformed microscopically, the deformation is caused as a result of the microscopic roughness profile of the third surface that resembles the pre-deformation microscopic roughness profile of the pressed portion being transferred to the first coating film surface, for example. Therefore, at the pressed portion of the first coating film surface, the change in texture is suppressed and a new gloss is less likely to be generated. Furthermore, all portions of the fourth surface of the packing sheet have a roughness profile that resembles the microscopic roughness profile of the second coating film surface of the second building board. Accordingly, even if the second coating film surface of the second building board is pressed by the fourth surface of the packing sheet and deformed microscopically, the deformation is caused as a result of the microscopic roughness profile of the fourth surface that resembles the pre-deformation microscopic roughness profile of the pressed portion being transferred to the second coating film surface, for example. Therefore, at the pressed portion of the second coating film surface, the change in texture is suppressed and a new gloss is less likely to be generated. 
     According to a second aspect of the present invention, a method for manufacturing a package is provided. The manufacturing method includes a preparing step and a stacking step. In the preparing step, a first building board having a first surface including a first coating film surface and a second surface opposite the first surface, and a packing sheet having a third surface and a fourth surface opposite the third surface are prepared. In the stacking step, the first building board and the packing sheet are stacked on top of each other such that the first coating film surface and the third surface are in contact with each other. An absolute value of a difference between a 60-degree gloss value of the first coating film surface and a 60-degree gloss value of the third surface is 3.0 or less, and an absolute value of a difference between an 85-degree gloss value of the first coating film surface and an 85-degree gloss value of the third surface is 3.0 or less. 
     In the present manufacturing method, the first coating film surface of the first building board and the third surface of the packing sheet have microscopic roughness profiles. The further the values of both a difference in gloss value between the first coating film surface and the third surface when measuring a gloss value at a relatively small incident angle of 60 degrees in a gloss value measurement, and a difference in gloss value between the first coating film surface and the third surface when measuring a gloss value at a relatively large incident angle of 85 degrees in a gloss value measurement are below 3.0, the more closely the microscopic roughness profile of the first coating film surface and the microscopic roughness profile of the third surface resemble each other. 
     When the first coating film surface of the first building board and the third surface of the packing sheet that have microscopic roughness profiles resembling each other are stacked on top of each other so as to be in contact with each other, and the first coating film surface of the first building board is protected by the third surface of the packing sheet, even if the first coating film surface of the first building board is pressed by the third surface of the packing sheet and deformed microscopically, the deformation is caused as a result of the microscopic roughness profile of the third surface that resembles the pre-deformation microscopic roughness profile of the pressed portion being transferred to the first coating film surface, for example. Therefore, at the pressed portion of the first coating film surface, the change in texture is suppressed and a new gloss is less likely to be generated. 
     Preferably, the present manufacturing method further includes a step of stacking a second building board having a fifth surface including a second coating film surface, and a sixth surface opposite the fifth surface, on top of the first building board with the packing sheet interposed between the second building board and the first building board such that the second coating film surface and the fourth surface of the packing sheet are in contact with each other. An absolute value of a difference between a 60-degree gloss value of the second coating film surface and a 60-degree gloss value of the fourth surface is 3.0 or less, and an absolute value of a difference between an 85-degree gloss value of the second coating film surface and an 85-degree gloss value of the fourth surface is 3.0 or less. 
     In such a configuration, the second coating film surface and the fourth surface that are in contact with each other in the second building board and the packing sheet have microscopic roughness profiles corresponding to their respective glosses. The further the values of both a difference in gloss value between the second coating film surface and the fourth surface when measuring a gloss value at a relatively small incident angle of 60 degrees in a gloss value measurement, and a difference in gloss value between the second coating film surface and the fourth surface when measuring a gloss value at a relatively large incident angle of 85 degrees in a gloss value measurement are below 3.0, the more closely the microscopic roughness profile of the second coating film surface and the microscopic roughness profile of the fourth surface resemble each other. When the second coating film surface of the second building board and the fourth surface of the packing sheet that have microscopic roughness profiles resembling each other are stacked on top of each other so as to be in contact with each other, and the second coating film surface of the second building board is protected by the fourth surface of the packing sheet, even if the second coating film surface of the second building board is pressed by the fourth surface of the packing sheet and deformed microscopically, the deformation is caused as a result of the microscopic roughness profile of the fourth surface that resembles the pre-deformation microscopic roughness profile of the pressed portion being transferred to the second coating film surface, for example. Therefore, at the pressed portion of the second coating film surface, the change in texture is suppressed and a new gloss is less likely to be generated. 
     In a preferred mode of the first aspect according to the present invention, the third surface of the packing sheet has a roughness profile in which a plurality of minute protrusions protruding to the first building board side are uniformly disposed. The configuration in which the minute protrusions are uniformly disposed on the third surface of the packing sheet is suitable for the minute protrusions to uniformly come into point contact with the first coating film of the first building board, and is suitable to efficiently disperse a pressing force applied when the first coating film surface of the first building board is pressed by the third surface of the packing sheet. Therefore, the configuration is suitable to suppress deformation of the pressed portion. Furthermore, all portions of the third surface of the packing sheet have a roughness profile that resembles the microscopic roughness profile of the first coating film surface of the first building board. Accordingly, even if the first coating film surface of the first building board is pressed by the third surface of the packing sheet and deformed microscopically, the deformation is caused as a result of the microscopic roughness profile of the third surface that resembles the pre-deformation microscopic roughness profile of the pressed portion being transferred to the first coating film surface, for example. Therefore, at the pressed portion of the first coating film surface, the change in texture is suppressed and a new gloss is less likely to be generated. 
     In a preferred mode of the first aspect according to the present invention, the third surface of the packing sheet has a roughness profile in which a plurality of minute protrusions protruding to the first building board side are uniformly disposed, and the fourth surface has a roughness profile in which a plurality of minute recesses are disposed at positions respectively corresponding to the plurality of minute protrusions. The configuration in which the minute protrusions are uniformly disposed on the third surface of the packing sheet is suitable for the minute protrusions to uniformly come into point contact with the first coating film of the first building board, and is suitable to efficiently disperse a pressing force applied when the first coating film surface of the first building board is pressed by the third surface of the packing sheet. Therefore, the configuration is suitable to suppress deformation of the pressed portion. In addition, the configuration in which the minute protrusions are uniformly disposed on the fourth surface of the packing sheet is suitable for the fourth surface of the packing sheet to uniformly come into point contact with the second coating film of the second building board, and is suitable to efficiently disperse a pressing force applied when the second coating film surface of the second building board is pressed by the fourth surface of the packing sheet. Therefore, the configuration is suitable to suppress deformation of the pressed portion. Furthermore, all portions of the third surface of the packing sheet have a roughness profile that resembles the microscopic roughness profile of the first coating film surface of the first building board. Accordingly, even if the first coating film surface of the first building board is pressed by the third surface of the packing sheet and deformed microscopically, the deformation is caused as a result of the microscopic roughness profile of the third surface that resembles the pre-deformation microscopic roughness profile of the pressed portion being transferred to the first coating film surface, for example. Therefore, at the pressed portion of the first coating film surface, the change in texture is suppressed and a new gloss is less likely to be generated. Furthermore, all portions of the fourth surface of the packing sheet have a roughness profile that resembles the microscopic roughness profile of the second coating film surface of the second building board. Accordingly, even if the second coating film surface of the second building board is pressed by the fourth surface of the packing sheet and deformed microscopically, the deformation is caused as a result of the microscopic roughness profile of the fourth surface that resembles the pre-deformation microscopic roughness profile of the pressed portion being transferred to the second coating film surface, for example. Therefore, at the pressed portion of the second coating film surface, the change in texture is suppressed and a new gloss is less likely to be generated. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG.  1    is a schematic cross-sectional view of a package according to a first embodiment of the present invention. 
         FIG.  2    is a partially enlarged perspective view of an example of a packing sheet. 
         FIG.  3    shows a cross-sectional view taken along the line III-III in  FIG.  2   . 
         FIG.  4    shows a method for manufacturing the package shown in  FIG.  1   . 
         FIG.  5    shows a case where the packages shown in  FIG.  1    are stacked in multiple tiers on a pallet. 
         FIG.  6    is a schematic cross-sectional view of a building board package according to a second embodiment of the present invention. 
         FIG.  7    shows a method for manufacturing the package shown in  FIG.  6   . 
         FIG.  8    shows a case where the packages shown in  FIG.  6    are stacked in multiple tiers on a pallet. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
       FIG.  1    is a schematic cross-sectional view of a package X 1  according to a first embodiment of the present invention. The package X 1  includes a first building board  10 , and a packing sheet  20  stacked on top of the first building board  10 . 
     The first building board  10  has a first surface  11  on the packing sheet  20  side, and a second surface  12  opposite the first surface  11 . The first surface  11  includes a first coating film surface  11 A. 
     The first coating film surface  11 A can be formed, for example, by applying a coating material to the first surface  11 , and drying the coating material, to form a coating film. Examples of the coating material include an acrylic resin coating material, a silicone-acrylic resin coating material, a silicone resin coating material, a fluororesin coating material, and a urethane resin coating material. The coating material may contain resin beads, a pigment, and a filler. The thickness of the coating film is 10 to 100 μm, for example. The first coating film surface  11 A may have a layered structure including a plurality of resin films. For example, the first coating film surface  11 A may have a layered structure including an undercoating film, an intermediate coating film, and a clear coating film in this order. 
     The packing sheet  20  includes a third surface  21  on the first building board  10  side, and a fourth surface  22  opposite the third surface  21 . The third surface  21  is in contact with the first coating film surface  11 A. Preferably, the third surface  21  has a roughness profile in which a plurality of minute protrusions protruding to the first building board  10  side are uniformly disposed. 
     The packing sheet  20  is a thin sheet that covers the first coating film surface  11 A of the first building board  10  to protect the first coating film surface  11 A. The packing sheet  20  may have any shape that can cover the first coating film surface  11 A, and may be a single sheet, a stack of two or more sheets, or a tubular sheet. The packing sheet  20  may also be disposed so as to cover only the first coating film surface  11 A, or may also be disposed so as to envelope the entire first building board  10 . 
     Examples of the material constituting the packing sheet  20  include a resin film. Examples of the resin film include polyethylene, polypropylene, vinyl chloride, nylon, polyester, polyvinyl alcohol, an ethylene-vinyl acetate copolymer, and triacetate. The packing sheet  20  may be a laminate film of a plurality of resin films. The packing sheet  20  may also be a laminate of a resin film and cloth or paper. 
     The roughness profile of the packing sheet  20  can be formed by a method such as incorporation of inorganic or organic particles when manufacturing a packing sheet, transferring of the surface profile of a metal roll, physical embossing through spraying of sand or the like, and chemical etching. 
     The thickness of the packing sheet  20  is not particularly limited, but is preferably 40 to 500 μm for a resin film and a laminate film, and is preferably 100 to 500 μm for a laminate of a resin film and cloth or paper. 
     In the package X 1 , an absolute value of a difference between a 60-degree gloss value of the first coating film surface  11 A and a 60-degree gloss value of the third surface  21  is 3.0 or less, and an absolute value of a difference between an 85-degree gloss value of the first coating film surface  11 A and an 85-degree gloss value of the third surface  21  is 3.0 or less. 
       FIG.  4    shows a method for manufacturing the package X 1 . The manufacturing method includes a preparing step and a stacking step as described below. 
     In the preparing step, a first building board  10  having a first surface  11  including a first coating film surface  11 A and a second surface  12  opposite the first surface  11 , and a packing sheet  20  including a third surface  21  and a fourth surface  22  opposite the third surface  21  are prepared. 
     In the stacking step, the first building board  10  and the packing sheet  20  are stacked on top of each other such that first coating film surface  11 A and the third surface  21  are in contact with each other. As described above, an absolute value of a difference between a 60-degree gloss value of the first coating film surface  11 A and a 60-degree gloss value of the third surface  21  is 3.0 or less, and an absolute value of a difference between an 85-degree gloss value of the first coating film surface  11 A and an 85-degree gloss value of the third surface  21  is 3.0 or less. 
     In the package X 1 , the first coating film surface  11 A and the third surface  21  that are in contact with each other in the first building board  10  and the packing sheet  20  that are stacked on top of each other have microscopic roughness profiles corresponding to their respective glosses. The further the values of both a difference in gloss value between the first coating film surface and the third surface when measuring a gloss value at a relatively small incident angle of 60 degrees in a gloss value measurement, and a difference in gloss value between the first coating film surface and the third surface when measuring a gloss value at a relatively large incident angle of 85 degrees in a gloss value measurement are below 3.0, the more closely the microscopic roughness profile of the first coating film surface  11 A and the microscopic roughness profile of the third surface  21  resemble each other. 
     For such a package X 1 , even if the first coating film surface  11 A of the first building board  10  is pressed by the third surface  21  of the packing sheet  20  and deformed microscopically in a state in which the packages X 1  are stacked in multiple tiers as shown in  FIG.  5   , for example, the deformation is caused by the microscopic roughness profile of the third surface  21  that resembles the pre-deformation microscopic roughness profile of the pressed portion (e.g., the microscopic roughness profile of the third surface  21  is transferred to the first coating film surface  11 A). Therefore, at the pressed portion of the first coating film surface  11 A, the change in texture is suppressed and a new gloss is less likely to be generated.  FIG.  5    illustratively shows a state in which packages X 1  are stacked in four tiers on a pallet P. 
     As described thus far, the package X 1  is suitable to suppress generation of a gloss that could be caused as a result of pressing a coating film on a surface of a building board. 
     Preferably, as described above, the third surface  21  has a roughness profile that includes a plurality of minute protrusions protruding to the first building board  10  side and in which the minute protrusions are uniformly disposed. Such a configuration is suitable to efficiently disperse a pressing force applied when the first coating film surface  11 A of the first building board  10  is pressed by the third surface  21  of the packing sheet  20 , and is therefore suitable to suppress deformation of the pressed portion. 
       FIG.  6    is a schematic cross-sectional view of a package X 2  according to a second embodiment of the present invention. The package X 2  includes a first building board  10 , a packing sheet  20 , and a second building board  30 . The package X 2  is different from the above-described package X 1  in that the package X 2  further includes the second building board  30 . 
     The second building board  30  has a fifth surface  31  on the first building board  10  side, and a sixth surface  32  opposite the fifth surface  31 , and is stacked on top of the first building board  10  with the packing sheet  20  interposed between the second building board  30  and the first building board  10 . The fifth surface  31  includes a second coating film surface  31 A. 
     In the present embodiment, the fourth surface  22  of the packing sheet  20  on the second building board  30  side is in contact with the second coating film surface  31 A. In the present embodiment, the third surface of the packing sheet  20  has a roughness profile that includes a plurality of minute protrusions protruding to the first building board  10  side and in which the minute protrusions are uniformly disposed, and the fourth surface  22  has a roughness profile including a plurality of minute recesses at positions respectively corresponding to the plurality of minute protrusions. 
     In the package X 2 , an absolute value of a difference between a 60-degree gloss value of the second coating film surface  31 A and a 60-degree gloss value of the fourth surface  22  is 3.0 or less, and an absolute value of a difference between an 85-degree gloss value of the second coating film surface  31 A and an 85-degree gloss value of the fourth surface  22  is 3.0 or less. 
       FIG.  7    shows a method for manufacturing such a package X 2 . The manufacturing method includes the above-described preparing step, the above-described stacking step (a first stacking step), and a stacking step (a second stacking step) as shown in  FIG.  7   . 
     In the second stacking step, a second building board  30  having a fifth surface  31  including a second coating film surface  31 A and a sixth surface  32  opposite the fifth surface  31  is stacked on top of the first building board  10  with the packing sheet  20  interposed between the second building board  30  and the first building board  10  such that the second coating film surface  31 A and the fourth surface  22  of the packing sheet  20  are in contact with each other. As described above, an absolute value of a difference between a 60-degree gloss value of the second coating film surface  31 A and a 60-degree gloss value of the fourth surface  22  is 3.0 or less, and an absolute value of a difference between an 85-degree gloss value of the second coating film surface  31 A and an 85-degree gloss value of the fourth surface  22  is 3.0 or less. 
     In the package X 2  manufactured in this manner, the second coating film surface  31 A and the fourth surface  22  that are in contact with each other in the second building board  30  and the packing sheet  20  have microscopic roughness profiles corresponding to their respective glosses. The further the values of both a difference in gloss value between the second coating film surface  31 A and the fourth surface  22  when measuring a gloss value at a relatively small incident angle of 60 degrees in a gloss value measurement, and a difference in gloss value between the second coating film surface  31 A and the fourth surface  22  when measuring a gloss value at a relatively large incident angle of 85 degrees in a gloss value measurement are below 3.0, the more closely the microscopic roughness profile of the second coating film surface  31 A and the microscopic roughness profile of the fourth surface  22  resemble each other. 
     For such a package X 2 , even if the second coating film surface  31 A of the second building board  30  is pressed by the fourth surface  22  of the packing sheet  20  and deformed microscopically in a state in which the packages X 2  are stacked in multiple tiers as shown in  FIG.  8   , for example, the deformation is caused by the microscopic roughness profile of the fourth surface  22  that resembles the pre-deformation microscopic roughness profile of the pressed portion. Therefore, at the pressed portion of the second coating film surface  31 A, the change in texture is suppressed and a new gloss is less likely to be generated.  FIG.  8    illustratively shows a state in which the packages X 2  are stacked in four tiers on a pallet P. 
     The package X 2  provides the foregoing technical effect in addition to the above-described technical effect relating to the package X 1 . 
     In the packing sheet  20  of the present embodiment, as described above, the third surface  21  has a roughness profile that includes a plurality of minute protrusions protruding to the first building board  10  side and in which the minute protrusions are uniformly disposed, and the fourth surface  22  has a roughness profile that includes a plurality of minute recesses at positions respectively corresponding to the plurality of minute protrusions. Such a configuration is suitable to efficiently disperse a pressing force applied when the first coating film surface  11 A of the first building board  10  is pressed by the third surface  21  of the packing sheet  20 , or when the second coating film surface  31 A of the second building board  30  is pressed by the fourth surface  22  of the packing sheet  20 , and is therefore suitable to suppress deformation of the pressed portion. 
     EXAMPLES 
     Example 1 
     Production of Building Board 
     First, an acrylic coating material was applied to a flat patterned design surface of an inorganic board (1820 mm×470 mm×16 mm, 17 kg), and was then dried, to form an intermediate coating film having a thickness of 20 μm. Next, a silicone-acrylic coating material containing resin beads was applied onto the intermediate coating film, and was then dried, to form a matte clear coating film having a thickness of 10 μm. In the above-described manner, two building boards B 1  each including a matte clear coating film on one surface thereof were produced. 
     Production of Package 
     First, a packing sheet S 1  (thickness: 50 μm, a polyethylene film) was placed such that a back surface of the packing sheet S 1  faced and contacted the matte clear coating film of one building board B 1 . The packing sheet S 1  had been subjected to embossing, and has, on a front surface thereof, a roughness profile including a plurality of minute protrusions (uniformly disposed) formed through the embossing, and has, on a back surface thereof, a roughness profile including a plurality of minute recesses at position respectively corresponding to the plurality of minute protrusions. On the front surface of the packing sheet S 1 , minute protrusions each having a top surface with an ellipsoidal shape of 310×410 μm and having a height of 42 μm are disposed substantially equidistantly in a zig-zag pattern, thus forming uniform roughness. On the back surface of the packing sheet S 1 , minute recesses each having a bottom surface with an ellipsoidal shape of 310×410 μm and having a depth of 38 μm are disposed substantially equidistantly in a zig-zag pattern at positions respectively corresponding to the plurality of minute protrusions, thus forming uniform roughness. Next, the other building board B 1  was stacked on top of the one building board B 1  with the packing sheet S 1  interposed between the other building board B 1  and the one building board B 1 . The other building board B 1  was placed such that the matte clear coating film thereof faced and contacted the other surface of the packing sheet S 1 . In the above-described manner, a package having the same stacked configuration as that shown in  FIG.  6    was produced. 
     Example 2 and Comparative Examples 1 and 2 
     Packages of Example 2 and Comparative Examples 1 and 2 were produced in the same manner as in the case of the package of Example 1 except that a packing sheet S 2  (Example 2), a packing sheet S 3  (Comparative Example 1) or a packing sheet S 4  (Comparative Example 2) was used in place of the packing sheet S 1 . 
     The packing sheet S 2  is a packing sheet (thickness: 80 μm, a polyethylene film) having a textured pattern formed through embossing. The packing sheet S 2  has, on a front surface thereof, a textured pattern (including a plurality of minute protrusions that are uniformly disposed) as a roughness profile formed through the embossing, and has, on a back surface thereof, a roughness profile including a plurality of minute recesses at positions respectively corresponding to the plurality of minute protrusions. 
     The packing sheet S 3  is a packing sheet (thickness: 56 μm, a calcium carbonate fine particle-containing polyethylene film) containing fine particles of calcium carbonate. 
     The packing sheet S 4  is a packing sheet (thickness: 200 μm) obtained by laminating both surfaces of kraft paper with a polyethylene resin. 
     Example 3 
     Production of Building Board 
     First, an acrylic coating material was applied to a brick patterned design surface of an inorganic board (1820 mm×470 mm×16 mm, 17 kg), and was then dried, to form an intermediate coating film having a thickness of 50 μm. Next, a silicone-acrylic coating material containing resin beads was applied onto the intermediate coating film, and was then dried, to form a matte clear coating film having a thickness of 40 μm. In the above-described manner, two building boards B 2  each including a matte clear coating film on one surface thereof were produced. 
     Production of Package 
     A packing sheet S 1  (thickness: 50 μm, a polyethylene film) was placed such that a back surface of the packing sheet S 1  faced and contacted the matte clear coating film of one building board B 2 . Next, the other building board B 2  was stacked on top of the one building board B 2  with the packing sheet S 1  interposed between the other building board B 2  and the one building board B 2 . The other building board B 2  was placed such that the matte clear coating film thereof faced and contacted the other surface of the packing sheet S 1 . In the above-described manner, a package having the same stacked configuration as that shown in  FIG.  6    was produced. 
     Comparative Example 3 
     A package of Comparative Example 3 was produced in the same manner as in the case of the package of Example 3 except that the packing sheet S 4  was used in place of the packing sheet S 1 . 
     Example 4 
     Production of Building Board 
     First, an acrylic coating material was applied to a flat patterned design surface of an inorganic board (1820 mm×470 mm×16 mm, 17 kg), and was then dried, to form an intermediate coating film having a thickness of 40 μm. Next, a silicone-acrylic coating material containing no resin beads was applied onto the intermediate coating film, to form a coating film. Then, the coating film was dried, to form a glossy clear coating film having a thickness of 5 μm. In the above-described manner, two building boards B 3  each including a glossy clear coating film on one surface thereof were produced. 
     Production of Package 
     First, a packing sheet S 5  (thickness: 60 μm, a polyethylene film) was placed such that a back surface of the packing sheet S 5  faced and contacted the glossy clear coating film of one building board B 3 . The packing sheet S 5  had been subjected to embossing, and has, on a front surface thereof, a roughness profile including a plurality of minute protrusions (uniformly disposed) formed through the embossing, and has, on a back surface thereof, a roughness profile including a plurality of minute recesses at position respectively corresponding to the plurality of minute protrusions. Specifically, on the front surface of the packing sheet S 5 , minute protrusion each having a top surface with a diamond shape of about 4×2 mm and having a height of 70 μm are disposed substantially equidistantly in a zig-zag pattern, thus forming uniform roughness. On each of the top surfaces of the minute protrusions, a plurality of further minute protrusions each having an ellipsoidal shape of about 300×500 μm are formed, thus forming roughness. On the back surface of the packing sheet S 5 , minute recesses each having a diamond shape are disposed substantially equidistantly in a zig-zag pattern at positions respectively corresponding to the minute protrusions, thus forming uniform roughness. Next, the other building board B 3  was stacked on top of the one building board B 3  with the packing sheet S 5  interposed between the other building board B 3  and the one building board B 3 . The other building board B 3  was placed such that the glossy clear coating film thereof faced and contacted the other surface of the packing sheet S 5 . In the above-described manner, a package having the same stacked configuration as that shown in  FIG.  6    was produced. 
     Comparative Examples 4 to 6 
     Packages of Comparative Examples 4 to 6 were produced in the same manner as in the case of the package of Example 4 except that the packing sheet S 4  (Comparative Example 4), a packing sheet S 6  (Comparative Example 5), or a packing sheet S 7  (Comparative Example 6) was used in place of the packing sheet S 5 . 
     The packing sheet S 6  is a non-stretched polypropylene sheet (thickness: 100 μm). 
     The packing sheet S 7  is a packing sheet (thickness: 76 μm) obtained by forming a polyethylene film containing calcium carbonate fine particles into a tubular shape. 
     Measurement of Gloss Values 
     For the surface of each of the matte clear coating films of the building boards B 1  and B 2 , the surface of the glossy clear coating film of the building board B 3 , and the front surface and the back surface of each of the packing sheets S 1  to S 7 , the 60-degree gloss value and the 85-degree gloss value were measured in accordance with JIS Z 8741. For this measurement, a gloss meter (product name “micro-TRI-gloss with standard holder, model 4430”, manufactured by BYK Gardner GmbH) was used. 
     For the surface of the matte clear coating film of the building board B 1 , the 60-degree gloss value G 60  was 4.0, and the 85-degree gloss value G 85  was 1.7. For the surface of the matte clear coating film of the building board B 2 , the 60-degree gloss value G 60  was 3.3, and the 85-degree gloss value G 85  was 3.2. For the surface of the glossy clear coating film of the building board B 3 , the 60-degree gloss value G 60  was 12.7, and the 85-degree gloss value G 85  was 12.8. 
     For each of Examples 1 to 4 and Comparative Examples 1 to 6, the 60-degree gloss value G 60  of each of the front surface and the back surface of the packing sheet used, the 85-degree gloss value G 85  of each of the front surface and the back surface of the packing sheet used, the absolute value ΔG 60  of a difference in 60-degree gloss value between the surface of the coating film of the building board and the front surface or the back surface of the packing sheet, and the absolute value ΔG 85  of a difference in 85-degree gloss value between the surface of the coating film of the building board and the front surface or the back surface of the packing sheet are shown in Table 1. 
     Evaluation of Generation of Gloss 
     For each of the packages of Examples 1 to 4 and Comparative Examples 1 to 6, generation of gloss on the surface of the coating film of the building board was evaluated in the following manner. First, 25 packages were stacked in multiple tiers. Next, after 24 hours, the packages were unpacked, and the surface of the coating film of each of the building boards of the package disposed in the lowermost tier was visually observed to check whether or not a new gloss has been generated. The results are shown in Table 1. 
     
       
         
           
               
               
               
               
               
               
               
             
               
                 TABLE 1 
               
               
                   
               
               
                   
                   
                 60-degree 
                 85-degree 
                   
                   
                   
               
               
                   
                   
                 gloss 
                 gloss 
                   
                   
                   
               
               
                   
                   
                 value 
                 value 
                   
                   
                   
               
               
                   
                 Measurement target for gloss value 
                 G 60   
                 G 85   
                 ΔG 60   
                 ΔG 85   
                 Visual evaluation 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
               
            
               
                 Example 1 
                 Front surface side of packing sheet S1 
                 5.6 
                 4.6 
                 1.6 
                 2.9 
                 No gloss confirmed 
               
               
                   
                 Back surface side of packing sheet S1 
                 3.4 
                 0.9 
                 0.6 
                 0.8 
                 No gloss confirmed 
               
               
                 Example 2 
                 Front surface side of packing sheet S2 
                 4.4 
                 9.9 
                 0.4 
                 8.2 
                 Gloss confirmed 
               
               
                   
                 Back surface side of packing sheet S2 
                 5.2 
                 3.3 
                 1.2 
                 1.6 
                 No gloss confirmed 
               
               
                 Com. Ex. 1 
                 Front surface side of packing sheet S3 
                 10.0 
                 23.4 
                 6.0 
                 21.7 
                 Gloss confirmed 
               
               
                   
                 Back surface side of packing sheet S3 
                 10.0 
                 23.4 
                 6.0 
                 21.7 
                 Gloss confirmed 
               
               
                 Com. Ex. 2 
                 Front surface side of packing sheet S4 
                 5.7 
                 9.6 
                 1.7 
                 7.9 
                 Gloss confirmed 
               
               
                   
                 Back surface side of packing sheet S4 
                 5.7 
                 9.6 
                 1.7 
                 7.9 
                 Gloss confirmed 
               
               
                 Example 3 
                 Front surface side of packing sheet S1 
                 5.6 
                 4.6 
                 2.3 
                 1.4 
                 No gloss confirmed 
               
               
                   
                 Back surface side of packing sheet S1 
                 3.4 
                 0.9 
                 0.1 
                 2.3 
                 No gloss confirmed 
               
               
                 Com. Ex. 3 
                 Front surface side of packing sheet S4 
                 5.7 
                 9.6 
                 2.4 
                 6.4 
                 Gloss confirmed 
               
               
                   
                 Back surface side of packing sheet S4 
                 5.7 
                 9.6 
                 2.4 
                 6.4 
                 Gloss confirmed 
               
               
                 Example 4 
                 Front surface side of packing sheet S5 
                 13.5 
                 10.9 
                 0.8 
                 1.9 
                 No gloss confirmed 
               
               
                   
                 Back surface side of packing sheet S5 
                 12.4 
                 13.6 
                 0.3 
                 0.8 
                 No gloss confirmed 
               
               
                 Com. Ex. 4 
                 Front surface side of packing sheet S4 
                 5.7 
                 9.6 
                 7.0 
                 3.2 
                 Loss of gloss occurred 
               
               
                   
                 Back surface side of packing sheet S4 
                 5.7 
                 9.6 
                 7.0 
                 3.2 
                 Loss of gloss occurred 
               
               
                 Com. Ex. 5 
                 Front surface side of packing sheet S6 
                 49.5 
                 42.2 
                 36.8 
                 29.4 
                 Gloss confirmed 
               
               
                   
                 Back surface side of packing sheet S6 
                 49.5 
                 42.2 
                 36.8 
                 29.4 
                 Gloss confirmed 
               
               
                 Com. Ex. 6 
                 Front surface side of packing sheet S7 
                 10.0 
                 44.0 
                 2.7 
                 31.2 
                 Gloss confirmed 
               
               
                   
                 Back surface side of packing sheet S7 
                 10.0 
                 44.0 
                 2.7 
                 31.2 
                 Gloss confirmed 
               
               
                   
               
            
           
         
       
     
     In Example 1, the absolute value G 60  of the difference in 60-degree gloss value and the absolute value G 85  of the difference in 85-degree gloss value between the surface of the coating film of the building board B 1  and the front surface of the packing sheet S 1  were both 3.0 or less, and generation of a new gloss was not confirmed on the surface of the coating film of the building board B 1  disposed on the front surface side of the packing sheet S 1 . In addition, in Example 1, the absolute value G 60  of the difference in 60-degree gloss value and the absolute value G 85  of the difference in 85-degree gloss value between the surface of the coating film of the building board B 1  and the back surface of the packing sheet S 1  were both 3.0 or less, and generation of a new gloss was not confirmed on the surface of the coating film of the building board B 1  disposed on the back surface side of the packing sheet S 1 . 
     In Example 2, the absolute value G 60  of the difference in 60-degree gloss value and the absolute value G 85  of the difference in 85-degree gloss value between the surface of the coating film of the building board B 1  and the back surface of the packing sheet S 2  were both 3.0 or less, and generation of a new gloss was not confirmed on the surface of the coating film of the building board B 1  disposed on the back surface side of the packing sheet S 2 . 
     In Example 3, the absolute value G 60  of the difference in 60-degree gloss value and the absolute value G 85  of the difference in 85-degree gloss value between the surface of the coating film of the building board B 2  and the front surface of the packing sheet S 1  were both 3.0 or less, and generation of a new gloss was not confirmed on the surface of the coating film of the building board B 2  disposed on the front surface side of the packing sheet S 1 . In addition, in Example 3, the absolute value G 60  of the difference in 60-degree gloss value and the absolute value G 85 , of the difference in 85-degree gloss value between the surface of the coating film of the building board B 2  and the back surface of the packing sheet S 1  were both 3.0 or less, and generation of a new gloss was not confirmed on the surface of the coating film of the building board B 2  disposed on the back surface side of the packing sheet S 1 . 
     In Example 4, the absolute value G 60  of the difference in 60-degree gloss value and the absolute value G 85  of the difference in 85-degree gloss value between the surface of the coating film of the building board B 3  and the front surface of the packing sheet S 5  were both 3.0 or less, and generation of a new gloss was not confirmed on the surface of the coating film of the building board B 3  disposed on the front surface side of the packing sheet S 5 . In addition, in Example 4, the absolute value G 60  of the difference in 60-degree gloss value and the absolute value G 85  of the difference in 85-degree gloss value between the surface of the coating film of the building board B 3  and the back surface of the packing sheet S 5  were both 3.0 or less, and generation of a new gloss was not confirmed on the surface of the coating film of the building board B 3  disposed on the back surface side of the packing sheet S 5 . 
     LIST OF REFERENCE NUMERALS 
     
         
         
           
             X 1 , X 2  Package 
               10  First building board 
               11  First surface 
               11 A First coating film 
               12  Second surface 
               20  Packing sheet 
               21  Third surface 
               22  Fourth surface 
               30  First building board 
               31  Fifth surface 
               31 A Second coating film 
               32  Sixth surface