JP6330931B2 - Sheet manufacturing apparatus and sheet manufacturing method - Google Patents

Description

  The present invention relates to a sheet manufacturing apparatus and a sheet manufacturing method.

  2. Description of the Related Art Conventionally, there is known a nonwoven fabric manufacturing apparatus including a far-infrared ceramic heater that heats a formed web and a pair of calender rollers that heat and press the web heated by the far-infrared ceramic heater (for example, Patent Documents). 1).

JP-A-8-49153

  However, in the said nonwoven fabric manufacturing apparatus, before pressurizing a web with a calender roller, it is the structure heated with a far-infrared ceramic heater. In this case, if the web is heated before being pressurized, the resin melts and binds between the fibers in a state where the fibers constituting the web are not sufficiently compressed. If it does so, the form of an insufficient density state will be established, and even if it pressurizes after that, the said form cannot be destroyed. Therefore, there is a problem that sufficient density and strength cannot be secured in the manufactured sheet.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

Application Example 1 A sheet manufacturing apparatus according to this application example includes a web forming unit that forms a web in which at least plant fibers and a resin are deposited in air, and a pressurizing unit that pressurizes the web without heating. A heating and pressing unit that heats and pressurizes the web downstream of the pressing unit in the web conveyance direction, and the pressing force of the pressing unit is greater than the pressing force of the heating and pressing unit. It is characterized by.

According to this configuration, first, the web formed by depositing plant fibers and resin is pressurized. At the time of this pressurization, the web is not heated but only the pressurization. By this pressurization, the distance between the plant fibers constituting the web is reduced. Next, the web is heated and pressurized in a state where the distance between the plant fibers is shortened. Thus, it is prevented web spring back, and molten resin in a state where the distance is contracted between the plant fibers, is sintered wear between plant fiber. Accordingly, a high-density and high-strength sheet can be formed.
Application Example 2 A sheet manufacturing apparatus according to this application example includes a web forming unit that forms a web in which at least plant fibers and a resin are deposited in the air, and a pressure that pressurizes the web without melting the resin. And a heating and pressing unit that heats and pressurizes the web downstream of the pressing unit in the conveyance direction of the web, and the pressing force of the pressing unit is the pressing force of the heating and pressing unit. It is characterized by being larger.
Application Example 3 In the sheet manufacturing apparatus according to the application example described above, the pressing force of the pressing unit is 500 to 3000 kgf, the pressing force of the heating and pressing unit is 30 to 200 kgf, When the pressure is a and the pressure of the heating and pressing unit is b, a / b satisfies 2.5 to 100.

Application Example 4 In the sheet manufacturing apparatus according to the application example described above, the pressing unit includes at least one pair of pressing rollers that press the web by sandwiching the web with a pair of rollers, and the heating and pressing unit includes: It has at least 1 pair of heating-pressing roller which heat-presses by pinching | interposing the said web with a pair of roller, It is characterized by the above-mentioned.

  According to this configuration, by using a pressure roller and a heating and pressure roller, the time from pressing to heating can be shortened compared to using at least one plate press, and heating is performed before pressing and springback. be able to. For example, in the case of a flat plate press, the distance between the front end of the web and the heating unit is short, but the distance between the rear end of the web and the heating unit becomes long. In addition, since the time from pressurization to heating can be made constant, unevenness in pressurization or heating can be suppressed.

Application Example 5 In the sheet manufacturing apparatus according to the application example, the diameter of the pressure roller is larger than the diameter of the heating and pressure roller.

According to this configuration, the state in which the web is formed in the air is a state in which the plant fiber and the resin are mixed, and is a state in which the air is soft and swelled. Therefore, by increasing the diameter of the pressure roller, in other words, by increasing the diameter of the pressure roller arranged on the upstream side with respect to the web transport direction, It can be reliably bitten and transported efficiently. On the other hand, since the web once pressed is hardened in shape, the diameter of the heating and pressing roller disposed downstream of the pressing roller with respect to the web conveyance direction may be small. Thereby, while improving the conveyance property of a web, an apparatus structure can be reduced in size.

Application Example 6 In the sheet manufacturing apparatus according to the application example, the member that can contact the web between the pressure roller and the heating and pressure roller is a web receiver that can support the web from below. It is only a member.

  According to this configuration, since only the receiving member that receives the web hangs downward between the pressure roller and the heat pressure roller, the distance between the pressure roller and the heat pressure roller can be shortened. As a result, the pressurized web is quickly heated and pressurized. Accordingly, the spring back of the web is suppressed, and a high-density and high-strength sheet can be formed.

Application Example 7 A sheet manufacturing method according to this application example includes a web forming process for forming a web in which at least plant fibers and a resin are deposited in the air, and a pressurizing process for pressurizing the web without heating. A heating step of heating and pressurizing the web after the pressing step, wherein the pressing force in the pressing step is larger than the pressing force in the heating and pressing step.

According to this configuration, first, the web formed by depositing plant fibers and resin is pressurized. At the time of this pressurization, the web is not heated but only the pressurization. By this pressurization, the distance between the plant fibers constituting the web is reduced. Next, the web is heated and pressurized in a state where the distance between the plant fibers is shortened. Thus, it is prevented web spring back, and molten resin in a state where the distance is contracted between the plant fibers, is sintered wear between plant fiber. Accordingly, a high-density and high-strength sheet can be formed.
[Application Example 8] A sheet manufacturing method according to this application example includes a web forming step of forming a web in which at least plant fibers and a resin are deposited in the air, and an application of pressurizing the web without melting the resin. A pressurizing step and a heating step of heating and pressurizing the web after the pressurizing step, wherein the pressurizing force in the pressurizing step is larger than the pressurizing force in the heating and pressurizing step.
[Application Example 9] In the sheet manufacturing method according to the application example, the pressing force in the pressing step is 500 to 3000 kgf, the pressing force in the heating and pressing step is 30 to 200 kgf, and the pressing step A / b satisfies 2.5 to 100, where a is the pressure applied in step a and b is the pressure applied in the heating and pressurizing step.

Schematic which shows the structure of a sheet manufacturing apparatus. Schematic which shows a partial structure of a sheet manufacturing apparatus. The schematic diagram which shows a sheet | seat manufacturing method.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following drawings, the scale of each member or the like is shown differently from the actual scale so as to make each member or the like recognizable.

  First, the configuration of the sheet manufacturing apparatus will be described. In addition, a sheet manufacturing method will be described. The sheet manufacturing apparatus is based on a technology for forming a raw material (defibrated material) Pu such as a pure pulp sheet or used paper on a new sheet Pr, for example. A sheet manufacturing apparatus according to this embodiment includes a web forming unit that forms a web in which at least fibers and a resin are deposited in air, a pressurizing unit that pressurizes the web without heating, and a web that is more than the pressurizing unit. A heating and pressing unit that heats and pressurizes the web downstream in the conveying direction, and the pressing force of the pressing unit is configured to be larger than the pressing force of the heating and pressing unit. The sheet manufacturing method according to the present embodiment includes a web forming step for forming a web in which at least fibers and a resin are deposited in air, a pressurizing step for pressurizing the web without heating, and a pressurizing step. A heating step of heating and pressurizing the web later, and the pressing force in the pressing step is larger than the pressing force in the heating and pressing step. In addition, the web concerning this embodiment says the structure form of the object containing a fiber and resin. Therefore, even when the shape or the like changes during heating, pressurizing, cutting, or conveying the web, the web is shown. This will be specifically described below.

  FIG. 1 is a schematic diagram illustrating a configuration of a sheet manufacturing apparatus according to the present embodiment, and FIG. 2 is a schematic diagram illustrating a partial configuration of the sheet manufacturing apparatus. FIG. 3 is a schematic diagram showing a sheet manufacturing method. First, as shown in FIG. 1, the sheet manufacturing apparatus 1 includes a supply unit 10, a crushing unit 20, a defibrating unit 30, a classification unit 40, a receiving unit 50, an additive charging unit 60, and a web. A forming unit 70, a pressurizing unit 120, a heating and pressurizing unit 150, and the like are provided.

  The supply unit 10 supplies the used paper Pu to the crushing unit 20. The supply unit 10 includes, for example, a tray 11 that accumulates and stores a plurality of used paper Pu, and an automatic feeding mechanism 12 that can continuously input the used paper Pu in the tray 11 to the crushing unit 20. The used paper Pu supplied to the sheet manufacturing apparatus is, for example, A4 size paper that is currently mainstream in offices.

  The crushing unit 20 cuts the supplied used paper Pu into pieces of several centimeters square. The crushing unit 20 includes a crushing blade 21 and constitutes an apparatus in which the cutting width of a normal shredder blade is widened. Thereby, the supplied used paper Pu can be easily cut into pieces of paper. Then, the divided coarsely crushed paper is supplied to the defibrating unit 30 via the pipe 201.

  The defibrating unit 30 includes a rotating blade (not shown) that rotates, and loosens (defibrates) the crushed paper supplied from the pulverizing unit 20 into a fiber shape. In addition, the defibrating unit 30 of the present embodiment performs defibrating in a dry manner in the air. By the defibrating process of the defibrating unit 30, printed ink, toner, a material for application to paper such as a bleeding prevention material, etc., become tens of μm or less and separate from the fibers (hereinafter referred to as “ink particles”). "). Therefore, the defibrated material that comes out from the defibrating unit 30 is fibers and ink particles obtained by defibrating a piece of paper. Then, the airflow is generated by the rotation of the rotary blade, and the fiber defibrated via the pipe 202 is carried on the airflow and conveyed to the classifying unit 40. In addition, when using the dry type defibrating part 30 which is not equipped with a wind generation mechanism, what is necessary is just to provide separately the airflow generator which generates an airflow from the crushing part 20 toward the defibrating part 30. FIG.

  The classifying unit 40 classifies the defibrated material into ink particles and fibers. In the present embodiment, a cyclone as the classifying unit 40 (hereinafter, described as a cyclone 40 as the classifying unit) is applied, and the conveyed fibers are classified into air currents into ink particles and deinked fibers (deinked defibrated material). To do. Note that another type of airflow classifier may be used instead of the cyclone 40. In this case, as an airflow classifier other than the cyclone 40, for example, an elbow jet, an eddy classifier, or the like is used. The airflow classifier generates a swirling airflow, which is separated and classified by the difference in centrifugal force received depending on the size and density of the defibrated material, and the classification point can be adjusted by adjusting the speed and centrifugal force of the airflow. . As a result, the ink particles are divided into relatively small and low density ink particles and fibers larger than the ink particles and high density. Removing ink particles from fibers is called deinking.

  The cyclone 40 has a structure in which a tangential input type cyclone is relatively simple. The cyclone 40 of the present embodiment includes an introduction port 40a introduced from the defibrating unit 30, a cylindrical portion 41 with the introduction port 40a attached in a tangential direction, a conical portion 42 following the lower portion of the cylindrical portion 41, and the conical portion 42. A lower outlet 40b provided in the lower portion and an upper exhaust port 40c for discharging fine powder provided in the upper center of the cylindrical portion 41 are configured. The diameter of the conical portion 42 decreases toward the lower side in the vertical direction.

  In the classification process, the airflow on which the defibrated material introduced from the introduction port 40a of the cyclone 40 is changed into a circumferential motion at the cylindrical portion 41, and centrifugal force is applied, and the fibers are entangled and enlarged due to a synergistic effect with the airflow. To the conical portion 42. Further, the separated ink particles are led to the upper exhaust port 40c as fine powder together with air, and deinking proceeds. Then, the short fiber mixture containing a large amount of ink particles is discharged from the upper exhaust port 40 c of the cyclone 40. Then, the short fiber mixture containing a large amount of discharged ink particles is collected in the receiving unit 50 via the pipe 203 connected to the upper exhaust port 40 c of the cyclone 40. On the other hand, the deinked fibers are conveyed from the lower outlet 40b of the cyclone 40 toward the web forming unit 70 through the pipe 204. In addition, it is good also as a structure which provided the suction mechanism for forcibly sucking the short fiber mixture in which the ink particle was contained abundantly in the upper exhaust port 40c side.

  Further, in the middle of the pipe 204 through which the deinked fibers are conveyed from the cyclone 40 to the web forming unit 70, a resin (for example, a fusion resin or a thermosetting resin) is used for the deinked fibers to be conveyed. An additive charging unit 60 for adding an additive is provided. In addition to the fusion resin, for example, a flame retardant, a colorant, a sheet strength enhancer, a sizing agent, and the like can be added as the additive. These additives are stored in the additive storage unit 61 and are charged from the charging port 62 by a charging mechanism (not shown).

  The web forming unit 70 forms a web obtained by laminating at least fibers and resin introduced from the pipe 204 in the air (corresponding to a web forming step). The web forming unit 70 has a mechanism for uniformly dispersing the fibers in the air and a mechanism for depositing the dispersed fibers on the mesh belt 73.

  First, as a mechanism for uniformly dispersing the fibers in the air, the web forming unit 70 is provided with a forming drum 71 into which the fibers and the resin are put. Then, the resin (additive) can be uniformly mixed in the fiber by rotationally driving the forming drum 71. A screen having a plurality of small holes is provided on the surface of the forming drum 71. Further, a rotatable needle roll is provided inside the forming drum 71 so as to float the input fibers. With such a configuration, the fibers that have passed through the small holes can be uniformly dispersed in the air.

  On the other hand, an endless mesh belt 73 in which a mesh stretched by stretch rollers 72 (in this embodiment, four stretch rollers 72) is formed below the forming drum 71. The mesh belt 73 is moved in one direction by rotating at least one of the stretching rollers 72.

  In addition, a suction device 75 as a suction unit that generates an airflow directed vertically downward is provided below the forming drum 71 via a mesh belt 73. The suction device 75 can suck the fibers dispersed in the air onto the mesh belt 73.

  When the entangled fibers are introduced from the cyclone 40 into the forming drum 71 of the web forming unit 70, the fibers and the resin are loosened by a needle roll or the like. The loosened fibers pass through a small hole screen 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 time, by moving the mesh belt 73 in one direction, it is possible to form the web W in which fibers and resin are deposited in a long shape. A continuous web W is formed by continuously performing dispersion from the forming drum 71 and movement of the mesh belt 73. The mesh belt 73 may be made of metal, resin, or non-woven fabric, and may be anything as long as fibers can be deposited and an air stream can pass therethrough. When the mesh hole diameter of the mesh belt 73 is too large, fibers enter between the meshes, resulting in unevenness when the web (sheet) is formed. On the other hand, when the mesh hole diameter is too small, the suction device 75 It is difficult to form a stable airflow. For this reason, it is preferable to adjust the hole diameter of a mesh suitably. The suction device 75 can be configured by forming a sealed box with a window of a desired size opened under the mesh belt 73, and sucking air from other than the window to make the inside of the box have a negative pressure from the outside air.

  As described above, after passing through the web forming portion 70 (web forming step), as shown in FIG. 3A, the fiber W and the resin R are mixed, and the web W in a state where it is soft and swelled with a lot of air. (Wa) is formed.

  Next, as shown in FIG. 1, the web W formed on the mesh belt 73 is transported according to the transport direction (arrow in the figure) by the rotational movement of the mesh belt 73. Next, the web W is transferred from the mesh belt 73 to the transport belt 101 stretched around the stretch roller 106, and is transported according to the transport direction (arrow in the figure).

  A pressure unit 120 is disposed on the downstream side of the conveyance belt 101 in the conveyance direction of the web W. The said pressurization part 120 pressurizes the formed web W, without heating (equivalent to a pressurization process). Therefore, the pressurizing unit 120 does not have heating means such as a heater. Then, by pressing (compressing) the web W, the density of the web W can be increased and the strength can be improved. The pressurizing unit 120 is configured to sandwich and pressurize the web W with rollers, and has a pair of pressurizing rollers 121. The pair of pressure rollers 121 have parallel central axes. In addition, the pressurization part 120 of this embodiment is provided with the 1st pressurization part 120a arrange | positioned in the upstream in the conveyance direction of the web W, and the 2nd pressurization part 120b arrange | positioned in the downstream, 1st Each of the pressure unit 120 a and the second pressure unit 120 b includes a pair of pressure rollers 121. Further, a guide 108 for assisting the conveyance of the web W is disposed between the first pressure unit 120a and the second pressure unit 120b.

  As shown in FIG. 2, the pressure roller 121 is constituted by a hollow metal core 122 made of, for example, aluminum, iron, or stainless steel. It should be noted that the surface of the heat and pressure roller 151 is subjected to rust prevention treatment such as electroless nickel plating or iron tetroxide coating, or PFA (tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer) or PTFE (polytetrafluoroethylene (polytetrafluoroethylene (polytetrafluoroethylene)). A tube containing fluorine such as tetrafluoro)) or a release layer of fluorine coating such as PTFE may be formed. Further, an elastic layer made of silicon rubber, urethane rubber, cotton or the like may be provided between the metal core 122 and the surface layer. By providing the elastic layer, the pair of pressure rollers 121 that are in pressure contact with each other with high load can be uniformly contacted in the axial direction of the pressure roller 121.

  As described above, as shown in FIG. 3B, the web W (Wa) put into the pressurizing unit 120 is not heated and undergoes only pressurization through the pressurizing unit 120 (pressurizing step). Since the resin R is not melted, only the fiber F is compressed and the interval (distance) between the fibers F is reduced. That is, the web W (Wb) having a high density is formed.

  As shown in FIG. 1, a heating and pressing unit 150 is disposed on the downstream side in the conveyance direction of the web W from the pressing unit 120. The heating and pressurizing unit 150 heats and presses the web W pressed by the pressing unit 120 (corresponding to a heating and pressing step). And by heating and pressurizing the web, the fibers contained in the web W can be bound together via a resin. The heating and pressing unit 150 is configured to heat and press the web W with a roller, and has a pair of heating and pressing rollers 151. The pair of heat and pressure rollers 151 have parallel central axes. By configuring the heating and pressing unit 150 as the heating and pressing roller 151, it is possible to form a sheet while continuously conveying the web as compared to the case where the heating and pressing unit 150 is configured as a plate-like press device. . Further, when a plate-like press device is used, a buffer unit for temporarily sagging the web to be transported during pressing is required. That is, the use of the heat and pressure roller 151 can increase the manufacturing efficiency and reduce the size of the entire sheet manufacturing apparatus 1.

  The heating and pressing unit 150 of the present embodiment includes a first heating and pressing unit 150a disposed on the upstream side in the conveyance direction of the web W and a second heating and pressing unit 150b disposed on the downstream side thereof. Each of the first heating and pressing unit 150a and the second heating and pressing unit 150b includes a pair of heating and pressing rollers 151. Further, a guide 108 for assisting the conveyance of the web W is disposed between the first heating and pressing unit 150a and the second heating and pressing unit 150b.

  As shown in FIG. 2, the heat and pressure roller 151 is constituted by a hollow metal core 152 made of aluminum, iron, stainless steel, or the like. On the surface of the heat and pressure roller 151, a tube containing fluorine such as PFA (tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer) or PTFE (polytetrafluoroethylene (tetrafluoroethylene)) or fluorine coating such as PTFE is used. A release layer 153 is provided. An elastic layer made of silicon rubber, urethane rubber, cotton, or the like may be provided between the metal core 152 and the release layer 153. By providing the elastic layer, the pair of heat and pressure rollers 151 that are in pressure contact with each other with a high load can be uniformly contacted in the axial direction of the heat and pressure roller 151.

  Further, a heating member 154 such as a halogen heater is provided at the center of the metal core 152 as a heating means. Each temperature of the heating and pressure roller 151 and the heating member 154 is acquired by a temperature detection unit (not shown), and the driving of the heating member 154 is controlled based on the acquired temperature. Thereby, the surface temperature of the heat and pressure roller 151 can be maintained at a predetermined temperature. Then, by passing the web W between the heat and pressure rollers 151, the web W to be conveyed can be heated and pressurized. The heating means is not limited to a halogen heater or the like, and for example, a heating means using a non-contact heater or a heating means using hot air may be used.

  As described above, through the heating and pressing unit 150 (heating and pressing step), the resin R melts and becomes easily entangled with the fibers F, and the fibers F are bound in a short state. Thereby, as shown in FIG.3 (c), it is densified and the high intensity | strength web W (Wc) is formed.

  As described above, in the present embodiment, the pressurization unit 120 (first pressurization unit 120a, second pressurization unit 120b) and the heat pressurization unit 150 (first heat pressurization unit 150a, second heat pressurization unit). 150b), where the pressurizing force of the pressurizing unit 120 is set to be larger than the pressurizing force of the heating and pressurizing unit 150. In other words, the web W is configured to be strongly pressurized at a stage before being heated. For example, the pressing force of the pressing unit 120 can be set to 500 to 3000 kgf, and the pressing force of the heating and pressing unit 150 can be set to 30 to 200 kgf. As described above, since the pressing force of the pressurizing unit 120 is larger than that of the heating and pressurizing unit 150, the distance between the fibers contained in the web W can be sufficiently shortened by the pressurizing unit 120, and heating and pressurization is performed in that state. Thus, a high-density and high-strength web W (sheet Pr) can be formed.

  The diameter of the pressure roller 121 is set to be larger than the diameter of the heat and pressure roller 151. In other words, in the conveyance direction of the web W, the diameter of the pressure roller 121 arranged on the upstream side is larger than the diameter of the heating and pressure roller 151 arranged on the downstream side. Since the pressure roller 121 has a large diameter, the web W that has not yet been compressed can be bitten and conveyed efficiently. On the other hand, since the web W that has passed through the pressure roller 121 is compressed and substantially in shape, and is easy to convey, the diameter of the heating and pressure roller 151 disposed downstream of the pressure roller 121 is It can be small. Thereby, a device structure can be reduced in size. The diameters of the heat and pressure roller 151 and the pressure roller 121 are appropriately set according to the thickness of the web W to be manufactured.

  Further, the member that can contact the web W between the pressure roller 121 of the pressure unit 120 and the heat and pressure roller 151 of the heating and pressure unit 150 is a web receiving member that can support the web W from below. The guide 108 is only. Therefore, the distance between the pressure roller 121 and the heat and pressure roller 151 can be shortened. Further, since the pressurized web W is quickly heated and pressed, the spring back of the web W is suppressed, and a high-density and high-strength sheet can be formed.

  A first cutting unit 110 serving as a cutting unit that cuts the web W in a direction intersecting the transport direction of the web W to be transported is disposed downstream of the heating and pressurizing unit 150 in the transport direction of the web W. . The first cutting unit 110 includes a cutter, and cuts the continuous web W into sheets (sheets) according to a cutting position set to a predetermined length. A second cutting unit 130 that cuts the web W along the conveyance direction of the web W is disposed downstream of the first cutting unit 110 in the conveyance direction of the web W. The second cutting unit 130 includes a cutter, and cuts (cuts) according to a predetermined cutting position in the conveyance direction of the web W. Thereby, a sheet Pr (web W) having a desired size is formed. Then, the cut sheet Pr (web W) is stacked on the stacker 160 or the like.

  As mentioned above, according to the said embodiment, the following effects can be acquired.

  The web W is formed by depositing fibers and resin. At this time, the web W is soft and swelled with a lot of air. Then, the web W in this state is pressurized. At this time, heating is not performed. Therefore, the resin in the web W is not melted, only the fibers are compressed, and the distance (distance) between the fibers is reduced. That is, the web W is densified. Then, the web W is heated and pressurized in a state where the fibers are densified. As a result, the resin is melted and bound in a state where the distance between the fibers is shortened. Accordingly, a high-density and high-strength sheet Pr (web W) can be formed.

  In addition, the sheet | seat concerning this embodiment mainly says what used the fiber as the raw material and was made into the sheet form. However, the shape is not limited to that, and may be a board shape or a web shape (or a shape having irregularities). The raw material may be plant fibers such as cellulose, chemical fibers such as PET (polyethylene terephthalate) and polyester, and animal fibers such as wool and silk. In the present application, the sheet is divided into paper and non-woven fabric. The paper includes a recording sheet for the purpose of writing and printing, including a mode in which a pure pulp or used paper is used as a raw material in a thin sheet form, and includes a wallpaper, a wrapping paper, a colored paper, a kent paper, and the like. Nonwoven fabrics are thicker or lower in strength than paper and include nonwoven fabrics, fiber boards, tissue paper, kitchen paper, cleaners, filters, liquid absorbents, sound absorbers, cushioning materials, mats, and the like.

  In the above embodiment, not only high strength and high density, but also the pressurizing unit presses more strongly than the heating and pressurizing unit, so that a thin sheet can be manufactured. This is effective in paper because paper is thinner than non-woven fabric. However, even if it is used for the production of a nonwoven fabric, it can be produced with high strength.

  The present invention is not limited to the above-described embodiment, and various modifications and improvements can be added to the above-described embodiment. A modification will be described below.

  (Modification 1) In the above embodiment, the pressurization unit 120 includes the two first pressurization units 120a and the second pressurization unit 120b. However, the present invention is not limited to this configuration. For example, the pressurizing unit 120 may have a single configuration. In addition, the heating and pressing unit 150 includes the two first heating and pressing units 150a and the second heating and pressing unit 150b, but the configuration is not limited thereto. For example, the heating and pressing unit 150 may have a single configuration. Even if it does in this way, the same effect as the above can be acquired. Moreover, the structure of the sheet manufacturing apparatus 1 can be further reduced in size.

  (Modification 2) In the said embodiment, although the 1st cutting part 110 has been arrange | positioned in the conveyance direction of the web W rather than the heating-pressing part 150, it is not limited to this. For example, the first cutting unit 110 may be disposed between the pressurizing unit 120 and the heating and pressurizing unit 150. In this way, the web W is changed from a long to a sheet-like form on the upstream side in the conveyance direction of the web W, and the length dimension of the web W in the conveyance direction is shortened. For this reason, generation | occurrence | production of the skew etc. concerning conveyance of the web W can be reduced.

  (Modification 3) In the said embodiment, the supply part 10, the crushing part 20, the defibrating part 30, the classification | category part 40, and the additive injection | throwing-in part 60 may not be. If a raw material that has been defibrated and added with additives is used, these components are not necessary. Necessary components may be added according to the form of the raw material to be used.

  (Modification 4) In the present application, the used paper mainly refers to printed paper. However, if used as a raw material, it is regarded as used paper regardless of whether it is used.

  DESCRIPTION OF SYMBOLS 1 ... Sheet manufacturing apparatus, 10 ... Supply part, 20 ... Crushing part, 30 ... Defibration part, 40 ... Classification part, 50 ... Receiving part, 60 ... Additive input part, 70 ... Web formation part, 108 ... Web receiving 110 as a member, 110 ... first cutting part, 120 ... pressurizing part, 120a ... first pressurizing part, 120b ... second pressurizing part, 121 ... pressurizing roller, 122 ... metal core, 130 ... first 2 cutting part, 150 ... heating and pressing part, 150a ... first heating and pressing part, 150b ... second heating and pressing part, 151 ... heating and pressing roller, 152 ... metal cored bar, 153 ... release layer, 154 ... heating member, 160 ... stacker.

Claims (9)

A web forming portion for forming a web in which at least plant fibers and a resin are deposited in the air;
A pressurizing unit that pressurizes the web without heating;
A heating and pressing unit that heats and pressurizes the web downstream of the pressing unit in the conveyance direction of the web,
The sheet manufacturing apparatus according to claim 1, wherein the pressing force of the pressurizing unit is larger than the pressing force of the heating and pressing unit.   A web forming portion for forming a web in which at least plant fibers and a resin are deposited in the air;
  A pressure unit that pressurizes the web without melting the resin;
  A heating and pressing unit that heats and pressurizes the web downstream of the pressing unit in the conveyance direction of the web,
  The sheet manufacturing apparatus according to claim 1, wherein the pressing force of the pressurizing unit is larger than the pressing force of the heating and pressing unit.   In the sheet manufacturing apparatus according to claim 1 or 2,
  The pressing force of the pressurizing part is 500 to 3000 kgf,
  The pressing force of the heating and pressing unit is 30 to 200 kgf,
  The sheet manufacturing apparatus according to claim 1, wherein a / b satisfies 2.5 to 100, where a is a pressing force of the pressing unit and b is a pressing force of the heating and pressing unit. In the sheet manufacturing apparatus according to any one of claims 1 to 3 ,
The pressure unit has at least one pair of pressure rollers that pressurize the web by sandwiching the web with a pair of rollers,
The sheet pressing apparatus according to claim 1, wherein the heating and pressing unit includes at least one pair of heating and pressing rollers that heat and press the web by sandwiching the web between the pair of rollers. In the sheet manufacturing apparatus according to claim 4 ,
The sheet manufacturing apparatus, wherein a diameter of the pressure roller is larger than a diameter of the heating and pressure roller. In the sheet manufacturing apparatus according to claim 4 or 5 ,
The sheet manufacturing apparatus according to claim 1, wherein a member that can contact the web between the pressure roller and the heating and pressure roller is only a web receiving member that can support the web from below. A web forming step of forming a web in which at least plant fibers and a resin are deposited in air;
A pressurizing step of pressurizing the web without heating;
A heating step of heating and pressing the web after the pressing step,
The sheet manufacturing method according to claim 1, wherein the pressing force in the pressing step is larger than the pressing force in the heating and pressing step.   A web forming step of forming a web in which at least plant fibers and a resin are deposited in air;
  A pressurizing step of pressurizing the web without melting the resin;
  A heating step of heating and pressing the web after the pressing step,
  The sheet manufacturing method according to claim 1, wherein the pressing force in the pressing step is larger than the pressing force in the heating and pressing step.   In the sheet manufacturing method according to claim 7 or 8,
  The applied pressure in the pressurizing step is 500 to 3000 kgf,
  The applied pressure in the heating and pressing step is 30 to 200 kgf,
  The sheet manufacturing method, wherein a / b satisfies 2.5 to 100, where a is a pressing force in the pressing step and b is a pressing force in the heating and pressing step.

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