Abstract:
A sheet-manufacturing device that manufactures a sheet of which the quality is stable, by controlling airflow to be constant and causing a defibrated state to be constant. A sheet-manufacturing device including a defibrating unit configured to generate a defibrated material by defibrating a defibration object; a temperature acquiring unit configured to acquire a temperature of the defibrating unit; and a control unit configured to change a mass flow rate of the air including the defibrated material transported from the defibrating unit.

Description:
TECHNICAL FIELD 
       [0001]    The invention relates to a sheet-manufacturing device and a method for controlling a sheet-manufacturing device. 
       BACKGROUND ART 
       [0002]    In the related art, since waste paper discharged from offices includes waste paper having confidential matters, in view of confidentiality, it is preferable that the waste paper is processed in the offices. Since a wet sheet-manufacturing device using a large quantity of water is not suitable in a small office, a dry sheet-manufacturing device having a simplified structure is suggested (for example, see PTL 1). 
       CITATION LIST 
     Patent Literature 
       [0003]    PTL 1: Japanese Unexamined Patent Application Publication No. 2012-144819 
       SUMMARY OF INVENTION 
     Technical Problem 
       [0004]    However, in the sheet-manufacturing device described above, there has been a problem in that, for example, if the temperature of a defibrating unit that defibrates paper (waste paper) changes, air density changes, transportation force by the airflow is caused to not be constant, and thus the defibrated state becomes unstable. This is a problem that is not limited to waste paper but also occurs even in a case where other raw materials are defibrated. 
       Solution to Problem 
       [0005]    The invention is to solve at least a unit of the problem described above, and can be performed by the following embodiments or application examples. 
       APPLICATION EXAMPLE 1 
       [0006]    According to this application example, a sheet-manufacturing device including: a defibrating unit configured to generate a defibrated material by defibrating a defibration object; a temperature acquiring unit configured to acquire a temperature of the defibrating unit; and a control unit configured to change a mass flow rate of the air including the defibrated material transported from the defibrating unit. 
         [0007]    According to this configuration, since the mass flow rate of the air including defibrated materials is changed based on the acquired temperature of the defibrating unit, the change of the mass flow rate of the air generated by the change of the temperature of the defibrating unit can be adjusted, such that defibration can be stably driven. Accordingly, the defibrated state becomes stable, such that an excellent sheet can be manufactured. 
       APPLICATION EXAMPLE 2 
       [0008]    In the sheet-manufacturing device according to the application example above, when the acquired temperature is higher, the control unit causes the mass flow rate to be higher than that when the acquired temperature is lower. 
         [0009]    When the temperature of the defibrating unit is higher, the density of the air decreases, such that the transportation properties of the defibrated materials decrease. Then, an excessive defibrated state in which fibers are more defibrated progresses, fibers become short, and thus the strength of the sheet that is formed decreases. Therefore, according to this configuration, if the temperature of the defibrating unit is higher, the transportation properties of the defibrated material can be increased by causing the mass flow rate to be greater than that when the temperature of the defibrating unit is lower. Accordingly, the excessive defibratied state can be cancelled. 
       APPLICATION EXAMPLE 3 
       [0010]    The sheet-manufacturing device according to the application example above further includes a suction unit that configured to suction the defibrated material, in which when the acquired temperature is higher, the control unit configured to cause a suction force of the suction unit to be greater than that when the acquired temperature is lower. 
         [0011]    According to this configuration, if the acquired temperature is higher, the mass flow rate of the air can be caused to be significant by causing the suction force of the suction unit to be significant. Accordingly, the transportation properties of the defibrated material can be increased. 
       APPLICATION EXAMPLE 4 
       [0012]    In the sheet-manufacturing device according to the application example above, the defibrating unit includes a rotary blade that rotates, and when the acquired temperature is higher, the control unit configured to cause a rotation speed of the rotary blade to be greater than that when the acquired temperature is lower. 
         [0013]    According to this configuration, if the acquired temperature is higher, the mass flow rate of the air can be caused to be great by causing the rotation speed of the rotary blade to be greater, such that the transportation properties of the defibrated material can be increased. 
       APPLICATION EXAMPLE 5 
       [0014]    In the sheet-manufacturing device according to the application example above, the temperature acquiring unit configured to acquire the temperature inside the defibrating unit. 
         [0015]    According to this configuration, since the temperature inside the defibrating unit can be acquired, the temperature can be easily acquired. 
       APPLICATION EXAMPLE 6 
       [0016]    In the sheet-manufacturing device according to the application example above, an upstream side and a downstream side of the defibrating unit in a transporting direction of the defibrated material are connected to an upstream transporting path and a downstream transporting path, respectively, and the temperature acquiring unit configured to acquire temperatures inside the upstream transporting path and inside the downstream transporting path. 
         [0017]    According to this configuration, since the temperatures of the upstream side and the downstream side of the defibrating unit are obtained, the temperature can be easily acquired. 
     
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         [0018]      FIG. 1  is a diagram schematically illustrating a configuration of a sheet-manufacturing device. 
           [0019]      FIG. 2  is another diagram schematically illustrating the configuration of the sheet-manufacturing device. 
           [0020]      FIG. 3  is a diagram schematically illustrating a configuration near the defibrating unit. 
           [0021]      FIG. 4  is a flow chart illustrating a method for controlling a sheet-manufacturing device. 
       
    
    
     DESCRIPTION OF EMBODIMENTS 
       [0022]    Hereinafter, embodiments of the invention are described with reference to the drawings. In addition, in the respective drawings, in order to cause the respective members to be recognizable, dimensions of the respective members are illustrated to be different from those in reality. 
         [0023]    First, configurations of a sheet-manufacturing device are described. The sheet-manufacturing device is based on, for example, a technique of reproducing a raw material (defibration object) such as waste paper (used paper) or a pulp sheet into a new sheet. Also, the sheet-manufacturing device includes a defibrating unit that generates a defibrated material by defibrating a defibration object, a temperature acquiring unit that acquires a temperature of the defibrating unit, and a control unit that changes the mass flow rate of the air including the defibrated material transported from the defibrating unit. In addition, a raw material as a defibration material to be supplied to a sheet-manufacturing device according to the embodiment is, for example, waste paper (raw material PU) such as A4 size which is typically used in offices, recently. Hereinafter, specific descriptions are provided. 
         [0024]      FIGS. 1 and 2  are diagrams schematically illustrating a configuration of a sheet-manufacturing device. As illustrated in  FIGS. 1 and 2 , a sheet-manufacturing device  1  includes a supplying unit  10 , a crushing unit  20 , a defibrating unit  30 , a classifying unit  40 , a receiving unit  45 , an additive agent feeding unit  60 , a forming unit  70 , a moisture spraying unit  120 , a pressurizing unit  80 , a heating and pressurizing unit  90 , and a cutting unit  100 . The sheet-manufacturing device  1  further includes a temperature acquiring unit  110  that acquires a temperature of the defibrating unit  30  and a blower  34  that adjusts the mass flow rate of the air. Also, the sheet-manufacturing device  1  includes a control unit (not illustrated) that controls these members. 
         [0025]    The supplying unit  10  is to provide the raw material PU as a product to be defibrated to the crushing unit  20 . The supplying unit  10  includes, for example, a tray  11  that disposing the plural raw materials PU in an overlapped manner and an automatic feeding mechanism  12  that can continuously insert the raw materials PU disposed in the tray  11  into the crushing unit  20 . 
         [0026]    The crushing unit  20  cuts the supplied raw material PU into squares strips of several centimeters. The crushing unit  20  includes a crushing blade  21 , and configures a device in which the cutting width of a blade of a general shredder is widened. Accordingly, the supplied raw materials PU can be easily cut into strips. Also, the strips are supplied to the defibrating unit  30  via an upstream transporting path  25 . 
         [0027]    The defibrating unit  30  includes a rotary blade that rotates and defibrates the strips supplied from the crushing unit  20  so as to have fiber shapes (cotton shape). In addition, the defibrating unit  30  according to the embodiment performs dry defibration in the air, not defibration in water. 
         [0028]    For example, a disc refiner, Turbo Mill (manufactured by Freund-Turbo Corporation), Ceren Miller (manufactured by Masuko Sangyo Co., Ltd.), and a dry defibration device including a wind generating mechanism are appropriately applied to the defibrating unit  30 . The size of strips inserted to the dry defibrating unit  30  may be the same size as those discharged by a general shredder. 
         [0029]    Printed ink or toner, anti-bleeding materials, or other coating materials on the raw material or the like are also released (separated) from a state of being attached on the fiber by a defibration process of the defibrating unit  30  (hereinafter, referred to as “ink particles”). Accordingly, the defibrated material discharged from the defibrating unit  30  is fibers and ink particles obtainable by defibrating the strips. 
         [0030]    Also, the defibrating unit  30  is a mechanism that generates airflow by the rotation of the rotary blade such that the defibrated material moves in the defibrating unit  30 . A downstream transporting path  35  that transports the defibrated materials by causing the defibrated materials to ride on the airflow is provided between the defibrating unit  30  and the classifying unit  40 , and the blower  34  that controls the speed of the airflow is arranged in the downstream transporting path  35 . The defibrated material is transported to the classifying unit  40  at a speed appropriate for being classified by the blower  34 . The blower  34  may have a function of suctioning the defibrated materials from the defibrating unit  30 . In this case, the blower  34  becomes a suction unit. In addition, another suction unit may be included between the blower  34  and the defibrating unit  30 . The suction unit can control the suction force. The amount of the defibrated materials that move in the defibrating unit  30  can be controlled by controlling the suction unit such as the blower  34 , such that the mass flow rate of the air including the defibrated materials can be controlled. 
         [0031]      FIG. 3  is a diagram schematically illustrating a configuration near the defibrating unit. Here, a first thermometer  113 , a second thermometer  114 , and a third thermometer  115 , as the temperature acquiring unit  110  that acquires the temperature, are provided near the defibrating unit  30 . 
         [0032]    As illustrated in  FIG. 3 , the first thermometer  113  that acquires the temperature of the defibrating unit  30  is provided in the defibrating unit  30 . The first thermometer  113  measures the temperature inside of the defibrating unit  30 . In addition, the second thermometer  114  that measures the temperature inside the upstream transporting path  25  and the third thermometer  115  that measures the temperature inside the downstream transporting path  35  are provided in the upstream transporting path  25  and the downstream transporting path  35 , respectively connected to the upstream side and the downstream side of the transporting direction of the defibrated materials of the defibrating unit  30 . 
         [0033]    Also, the suction amount of the blower  34  as the suction unit is controlled in response to the temperatures acquired by the first thermometer  113 , the second thermometer  114 , and the third thermometer  115 . 
         [0034]    The classifying unit  40  classifies the transported defibrated materials into the ink particles and the fibers, such that the ink particles are removed. A cyclone  40 , as the classifying unit  40 , according to the embodiment is applied. As the cyclone  40 , a tangential line input-type cyclone has a comparatively simple structure, and is preferable. In addition, instead of the cyclone  40 , another kind of the airflow-type classifier may be used. In this case, as an airflow-type classifier other than the cyclone  40 , for example, an Elbow-jet or an Eddy Classifier can be used. The airflow-type classifier generates the turning airflow, and performs separation and classification according to the difference of the centrifugal forces received depending on the size and the density of the defibrated material such that the classification point can be adjusted by the speed of the airflow and the adjustment of the centrifugal force. 
         [0035]    The cyclone  40  according to the embodiment includes an introduction port  41  introduced from the defibrating unit  30 , a cylindrical portion  43  to which the introduction port  41  is connected in a tangential direction, a conical portion  42  that extends to the cylindrical portion  43 , a lower output port  46  provided on the lower portion of the conical portion, and an upper exhaust port  44  for discharging fine powder which is provided on the central and upper portion of the cylindrical portion  43 . 
         [0036]    In the classification process, the airflow carrying the defibrated materials introduced from the introduction port  41  of the cyclone  40  is changed to circumferentially move in the cylindrical portion  43 , and moves to the conical portion  42 . Also, separation and classification according to the difference of the centrifugal force received depending on the size and the size and the density of the defibrated material are performed. If products included in the defibrated materials are classified into two kinds of the fibers and the ink particles other than the fibers, the fibers are greater than the ink particles or have high density. Therefore, the defibrated materials are separated into the ink particles which are smaller than fibers and have low density and the fibers which are greater than the ink particles and have high density, by the classification process. 
         [0037]    The separated ink particles are derived to the upper exhaust port  44  as fine powder together with the air. Also, relatively small ink particles which have low density are discharged from the upper exhaust port  44  of the cyclone  40 . Also, the discharged ink particles are recollected from the upper exhaust port  44  of the cyclone  40  to the receiving unit  45  via a pipe  203 . Meanwhile, the fibers that are greater than ink particles and have high density are transported from the lower output port of the cyclone  40  to the forming unit  70  as the defibrated fibers. 
         [0038]    The additive feeding unit  60  that adds additives to the defibrated fiber is provided in the middle of a pipe  204  through which the defibrated fibers are transported from the cyclone  40  to the forming unit  70 . As the additive, for example, a fusion resin, flame retardant, a whiteness improving agent, a paper strengthening agent, or a sizing agent is included. In addition, a portion or all of the additives may be omitted, or another additive may be further inserted. The additive is stored in a storage unit  61  and fed from a feed port  62  by a feeding mechanism (not illustrated). 
         [0039]    A sheet is formed by using a mixture in which an additive is mixed with the defibrated fibers. Therefore, a mixture in which a fusion resin or an additive is mixed with the defibrated fibers is called a material fiber. 
         [0040]    The forming unit  70  is obtained by depositing the material fibers so as to have an even thickness. The forming unit  70  has a mechanism of evenly dispersing the material fibers in the air and a mechanism of suctioning the material fibers on a mesh belt  73 . 
         [0041]    First, as the mechanism of evenly dispersing the material fibers in the air, a forming drum  71  in which material fibers are inserted inside thereof is arranged in the forming unit  70 . The forming drum  71  may evenly mix the additive in the fiber by rotation. A screen with small holes is provided on the surface of the forming drum  71 . The forming drum  71  is rotationally driven, the material fibers pass through the screen with small holes, and thus the material fibers can be evenly dispersed in the air. 
         [0042]    Meanwhile, the endless mesh belt  73  in which meshes are formed is disposed vertically downward from the forming drum  71 . The mesh belt  73  is stretched by plural stretching rollers  72 , at least one of the stretching rollers  72  rotates, and thus the mesh belt  73  moves in one direction. 
         [0043]    In addition, a suction device  75  that vertically downwardly generates the airflow is provided vertically downward from the forming drum  71  via the mesh belt  73 . The material fibers dispersed in the air can be sucked onto the mesh belt  73  by the suction device  75 . 
         [0044]    If the material fibers are introduced into the forming drum  71  of the forming unit  70 , the material fibers pass through the screen with small holes on the surface of the forming drum  71  and are deposited on the mesh belt  73  by the suction force of the suction device  75 . At this point, the mesh belt  73  is caused to move in one direction, and thus the material fibers can be deposited in an even thickness. A deposit including the material fibers deposited in this manner is called a web W. In addition, the mesh belt may be made of metal, a resin, or a nonwoven fabrics, and any products can be used as long as the material fibers can be deposited and the airflow can pass. In addition, if the hole diameter of the mesh is too large, a surface of a sheet at the time of being formed becomes uneven. If the hole diameter of the mesh is too small, it is difficult to stabilize airflow by the suction device  75 . Therefore, it is preferable that the hole diameter of the mesh is appropriately adjusted. The suction device  75  can be formed by forming a closed box in which a window in a desired size is open under the mesh belt  73 , sucking the air in the box from the outside of the window, and causing the inside of the box to have low pressure. 
         [0045]    The web W is transported in the web transporting direction illustrated by an arrow in  FIG. 2  by moving the mesh belt  73 . The moisture spraying unit  120  sprays and adds moisture to the transported web W. Accordingly, hydrogen bonds between the fibers can be reinforced. Also, the web W to which moisture is sprayed is transported to the pressurizing unit  80 . 
         [0046]    The pressurizing unit  80  pressurizes the transported web W. The pressurizing unit  80  includes two pairs of pressurizing rollers  81 . The web W is compressed by causing the web W to which the moisture is sprayed to pass through a portion between the pressurizing rollers  81  facing each other. Also, the compressed web W is transported to the heating and pressurizing unit  90 . 
         [0047]    The heating and pressurizing unit  90  heats and pressurizes the transported web W at the same time. The heating and pressurizing unit  90  includes two pairs of heating rollers  91 . The compressed web W is heated and pressurized by causing the compressed web W to pass through a portion between the heating rollers  91  facing each other. 
         [0048]    In a state in which contact points between the fibers are increased by the pressurizing rollers  81  causing the distances between the fibers to be short, the fusion resin is melted by the heating rollers  91 , such that the fibers are bound. Accordingly, the strength of the sheets are increased, the excessive moisture is dried, and thus excellent sheets are manufactured. In addition, with respect to the heating, it is preferable that the web W is pressurized and heated at the same time, by installing a heater in the heating rollers  91 . In addition, a guide  108  guiding the web W is arranged under the pressurizing rollers  81  and the heating rollers  91 . 
         [0049]    The sheet (the web W) obtained as described above is transported to the cutting unit  100 . The cutting unit  100  includes a cutter  101  that performs cutting in the transporting direction and a cutter  102  that performs cutting in the direction perpendicular to the transporting direction, and cuts the long sheets into a desired size. Cut sheets Pr (the webs W) are stacked on a stacker  160 . 
         [0050]    Subsequently, a method for controlling the sheet-manufacturing device is described. Specifically, a controlling method for controlling the suction force of the blower  34  according to the temperature of the acquired defibrating unit  30  is described.  FIG. 4  is a flow chart illustrating a method for controlling a sheet-manufacturing device. 
         [0051]    First, the temperature of the defibrating unit  30  is acquired. According to the embodiment, respective temperatures measured by the first thermometer  113 , the second thermometer  114 , and the third thermometer  115 , as the temperature acquiring unit  110  are acquired (Step S 1 ). 
         [0052]    Subsequently, the mass flow rate of the air including the defibrated material transported from the defibrating unit  30  according to the acquired temperature is controlled. 
         [0053]    The control unit decides whether the temperature acquired in Step S 1  is higher than a predetermined temperature (Step S 2 ). If the defibrating unit  30  is continuously driven, the temperature inside thereof gradually increases, and thus the predetermined temperature is set to be the temperature when the defibrating unit  30  is driven for a long time. 
         [0054]    If the acquired temperature is not higher than the predetermined temperature (NO in Step S 2 ), the defibrating unit  30  is in a state of being normally driven, and in this case, the blower  34  as the suction unit is controlled in a normal mode and performs suction (Step S 4 ). 
         [0055]    Meanwhile, if the acquired temperature is higher than the predetermined temperature (YES in Step S 2 ), the defibrating unit  30  is in a state of being driven for a long time. With respect to the controlling of the blower  34  in this case, the mass flow rate of the air is caused to be great by performing suction by the suction force greater than that in Step S 4  (Step S 3 ). 
         [0056]    According to the embodiment, if the acquired temperature is higher than the predetermined temperature, the suction force of the blower  34  is caused to be greater than that in the normal mode. Accordingly, the mass flow rate of the air is caused to be great, such that the transportation properties of the defibrated materials are improved. Also, the generation of the short fiber is suppressed since the excessive defibrated state of the defibrating unit  30  is cancelled. 
         [0057]    In addition, according to the embodiment, the temperature is divided according to whether the temperature is higher than the predetermined temperature, but may be divided according to whether the temperature is lower than the predetermined temperature. In addition, plural predetermined temperatures may be prepared, and the temperatures may be divided into three according to the number of the prepared predetermined temperatures. The predetermined temperatures in this case refer to plural temperatures including the temperature when driving is performed for a long time. In addition, the temperature may not be compared with the predetermined temperature, and the acquired temperatures may be compared with each other. In any cases, when the acquired temperature is higher, the mass flow rate becomes greater than that when the acquired temperature is lower, such that the suction force increases. 
         [0058]    Hereinafter, according to the embodiment, the following effects can be obtained. 
         [0059]    (1) The temperature of the defibrating unit  30  is measured by the temperature acquiring unit  110 , and, for example, if the temperature of the defibrating unit  30  is high, the suction force of the blower  34  as the suction unit increases. Accordingly, the transportation properties of the defibrated material in the defibrating unit  30  are improved, the excessive defibrated state is cancelled, short fibers are scarce, and thus a sheet having the secured strength can be manufactured. 
         [0060]    In addition, the invention is not limited to the embodiments described above, and various modifications, improvements, and the like can be added to the embodiments described above. The modification examples are described below. 
         [0061]    According to the embodiment, the first thermometer  113  measures the temperature inside the defibrating unit  30 , but the invention is not limited thereto. The invention may be configured such that the temperature of the surface outside the defibrating unit  30  is measured. In addition, the invention may have a configuration in which the second thermometer  114  and the third thermometer  115  measure the temperatures of the surface outside the upstream transporting path  25  and the downstream transporting path  35  in the same manner. Also in this manner, the temperature changes of the respective portions can be easily acquired, such that the same effect can be obtained. 
         [0062]    According to the embodiment described above, the first thermometer  113 , the second thermometer  114 , and the third thermometer  115  are provided as the temperature acquiring unit  110 , but the invention is not limited to this configuration. If three thermometers are used, while the temperatures inside the defibrating unit  30  are obtained, the rising state of the temperature of the defibrated materials in the defibrating unit  30  can be obtained by the temperature differences between the upstream and the downstream of the defibrating unit  30 . However, only the temperature in the defibrating unit  30  may be obtained only with the first thermometer  113 . In addition, the temperature difference between the upstream and downstream of the defibrating unit  30  may be obtained by including the second thermometer  114  and the third thermometer  115  only. In addition, only the third thermometer  115  may be included. If two of the second thermometer  114  and the third thermometer  115  are included, or one of the third thermometer  115  is included, since the temperatures of defibrated materials passing through a portion inside the defibrating unit  30  can be estimated, it can be considered that the temperature of the defibrating unit  30  is acquired. In this manner, the cost can be decreased by reducing the number of thermometers. 
         [0063]    In addition, a thermometer may be added to the first thermometer  113 , the second thermometer  114 , and the third thermometer  115 . In this manner, more specifically, the temperature of the defibrating unit  30  and the temperature near the defibrating unit  30  can be acquired. 
         [0064]    According to the embodiment, the mass flow rate of the air including the defibrated materials transported from the defibrating unit  30  is changed by controlling the blower  34 , but the invention is not limited to this configuration. For example, a wind generating mechanism that generates airflow is arranged in the defibrating unit  30 . Specifically, the defibrating unit  30  includes a rotary blade that rotates, the control unit controls the number of rotations of the rotary blade depending on the acquired temperature. For example, when the acquired temperature is higher than the predetermined temperature, the rotation speed of the rotary blade is caused to be greater than that when the acquired temperature is lower than the predetermined temperature. In this manner, since the mass flow rate of the air increases, the excessive defibrated state is cancelled, and thus an appropriate defibration can be performed. In addition, blades (such as impeller blades) that generate airflow may be provided in addition to the rotary blade so as to rotate together with the blades. 
         [0065]    According to the embodiments described above, the mass flow rate of the air including the defibrated materials transported from the defibrating unit  30  is changed by controlling the blower  34 , but the invention is not limited to this configuration. For example, the mass flow rate of the air including the defibrated materials transported from the defibrating unit  30  may be changed by controlling the suction device  75  of the forming unit  70 . 
         [0066]    In addition, the introduction force that introduces the air to the defibrating unit  30  may be controlled not by perform suction from the downstream side of the defibrating unit  30 , but by providing an airflow introducing unit on the upstream side of the defibrating unit  30 , so as to control the airflow. In addition, the introduction force may be controlled not by providing the airflow introducing unit, but by introducing exhaust gas from the suction device  75  to the defibrating unit  30 . The same effect can be obtained by causing the introduction force from the airflow introducing unit to be great and causing the suction force by the suction unit to be great. 
         [0067]    According to the embodiment, the temperature of the defibrating unit  30  is directly acquired by the first thermometer  113 , but the invention is not limited to this configuration. For example, as illustrated in  FIG. 3 , a flow meter  116  that measures the flow rate of the air may be provided in the downstream transporting path  35 , the measurement value of the flow meter  116  is used, such that the temperature in the defibrating unit  30  by calculation or using a data table created in advance may be obtained. If the temperature increase, the mass flow rate decreases and thus the flow rate may be measured without measuring the temperature. Therefore, it can be considered that the flow meter  116  is the temperature acquiring unit  110 . Also in this manner, the effect described above can be obtained. 
         [0068]    The “sheet” according to the embodiment mainly refers to a sheet which is made from the raw material comprising fibers such as waste paper or fibers such as pure pulp. However, the invention is not limited thereto, but may be a board shape or a web shape (or shape having unevenness). In addition, as the raw material, a plant fiber such as cellulose, chemical fibers such as polyethylene terephthalate (PET) and polyester, or animal fibers such as wool or silk may be used. The sheet according to the invention can be classified as paper and nonwoven material. The paper includes embodiments in a thin sheet, and includes recording paper for the purpose of writing and printing, wallpaper, wrapping paper, colored paper, Kent paper, or the like. The nonwoven materials are products thicker than paper or products having low strength, and includes typical nonwoven materials, a fiber board, tissue paper, paper towel, a cleaner, a filter, a liquid absorbing material, a sound absorbing body, a buffer material, a mat, and the like. 
       REFERENCE SIGNS LIST 
       [0000]    
       
         
           
               1  SHEET-MANUFACTURING DEVICE 
               10  SUPPLYING UNIT 
               20  CRUSHING UNIT 
               25  UPSTREAM TRANSPORTING PATH 
               30  DEFIBRATING UNIT 
               35  DOWNSTREAM TRANSPORTING PATH 
               40  CLASSIFYING UNIT (CYCLONE) 
               45  RECEIVING UNIT 
               60  ADDITIVE FEEDING UNIT 
               70  FORMING UNIT 
               80  PRESSURIZING UNIT 
               90  HEATING AND PRESSURIZING UNIT 
               100  CUTTING UNIT 
               110  TEMPERATURE ACQUIRING UNIT 
               113  FIRST THERMOMETER 
               114  SECOND THERMOMETER 
               115  THIRD THERMOMETER 
               116  FLOW METER