JP2017094525A - Sheet manufacturing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet manufacturing apparatus capable of suppressing waviness of a sheet.SOLUTION: A sheet manufacturing apparatus includes: a fibrillating section which fibrillates a raw material containing a fiber in the air; a mixing section which mixes a fibrillated substance fibrillated by the fibrillating section and a resin in the air; a deposition section which deposits a mixture mixed by the mixing portion; a pressurizing section which pressurizes a deposited substance deposited by the deposition section; a heating section which heats the deposition substance pressurized by the pressurizing section; and a tension applying section which is arranged either between the pressurizing section and the heating section or in a downstream side of the heating section and deforms the deposition substance so that a path length of the deposition substance becomes the same in the width direction of the deposition substance.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a sheet manufacturing apparatus.

  2. Description of the Related Art Conventionally, in a sheet manufacturing apparatus, a so-called wet method is adopted in which a raw material containing fibers is put into water, disaggregated mainly by a mechanical action, and re-made. Such a wet type sheet manufacturing apparatus requires a large amount of water, and the apparatus becomes large. Furthermore, it takes time and effort to maintain the water treatment facility, and energy related to the drying process increases. Therefore, for the purpose of miniaturization and energy saving, a dry sheet manufacturing apparatus that uses water as little as possible has been proposed.

  For example, in Patent Document 1, in a thin sheet winding device, a weight roll that is disposed so as to be able to advance and retreat and applies a constant tension to the sheet material, and a tension of the sheet material that is disposed downstream of the weight roll. And a control means for controlling the servo motor to keep the tension of the sheet material constant based on a detection signal from the tension detection means.

Japanese Patent Laid-Open No. 11-60003

  In the sheet manufacturing apparatus, for example, after pressing a web with a pressure roller, the web is further heated with a heating roller to form a sheet. However, in the sheet manufacturing apparatus, for example, the pressure applied to the web by the pressure roller may not be uniform in the width direction of the web, and the amount of elongation of the web may not be uniform in the width direction. In such a case, waviness occurs in the sheet. For this reason, it is conceivable to make the amount of web elongation uniform by applying tension. However, for example, the technique of Patent Document 1 is a technique related to a winding device, and is not a state of a web but a state of a sheet in which the structure of the web is fixed by heating the web (the defibrated material is bound by a resin). Force is applied with a weight roll. Therefore, when the technique of Patent Document 1 is used in order to make the elongation amount of the web uniform, a force is applied to the sheet on which the structure is fixed. Therefore, the elongation amount is made uniform in the width direction. It ’s difficult.

  One of the objects according to some aspects of the present invention is to provide a sheet manufacturing apparatus capable of suppressing sheet waviness.

  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 aspects or application examples.

One aspect of the sheet manufacturing apparatus according to the present invention is:
A defibrating unit for defibrating raw materials containing fibers in air,
A mixing unit for mixing the defibrated material and the resin defibrated by the defibrating unit in the air;
A depositing section for depositing the mixture mixed by the mixing section;
A pressurizing unit that pressurizes the deposit deposited by the depositing unit;
A heating unit for heating the deposit pressed by the pressing unit;
Disposed between at least one of the pressurizing unit and the heating unit and downstream of the heating unit, the deposit is deformed so that the path length of the deposit is the same in the width direction of the deposit. A tensioning unit;
Is provided.

  In such a sheet manufacturing apparatus, even if the pressure applied to the deposit by the pressurizing unit is not uniform in the width direction of the deposit and the elongation amount of the deposit is different in the width direction, the tension applying unit causes the pressure in the width direction. The difference in the amount of extension of the deposit can be reduced. As a result, in such a sheet manufacturing apparatus, it is possible to suppress the occurrence of waviness in the sheet.

In the sheet manufacturing apparatus according to the present invention,
A transport unit that transports the deposit heated by the heating unit;
The tension applying unit may be disposed between the heating unit and the transport unit.

  In such a sheet manufacturing apparatus, it is possible to suppress the occurrence of waviness in the sheet.

In the sheet manufacturing apparatus according to the present invention,
The tension applying unit is
A tension roller in contact with the deposit;
A swingable support that rotatably supports the tension roller, and a support that translates the rotation axis of the tension roller by swinging;
Have
The axis of rotation of the tension roller may be parallel to the width direction.

  In such a sheet manufacturing apparatus, the tension applying unit can deform the deposit so that the path length of the deposit is the same in the width direction of the deposit.

In the sheet manufacturing apparatus according to the present invention,
The pressurizing unit may have a reverse crown-shaped roller.

  In such a sheet manufacturing apparatus, it is possible to suppress generation of wrinkles at the end in the width direction of the deposit by passing through the pressurizing unit.

In the sheet manufacturing apparatus according to the present invention,
The heating unit may have a reverse crown-shaped roller.

  In such a sheet manufacturing apparatus, it can suppress that a flaw generate | occur | produces in the edge part in the width direction of a deposit by passing a heating part.

The figure which shows typically the sheet manufacturing apparatus which concerns on this embodiment. The figure which shows typically the sheet manufacturing apparatus which concerns on this embodiment. Sectional drawing which shows the sheet | seat manufacturing apparatus which concerns on this embodiment typically. The perspective view which shows typically the tension | tensile_strength provision part of the sheet manufacturing apparatus which concerns on this embodiment. The perspective view which shows typically the state which the deposit is not deform | transforming by the tension provision part. The perspective view which shows typically the state which the deposit is deform | transforming by the tension provision part. Sectional drawing which shows the sheet | seat manufacturing apparatus which concerns on this embodiment typically. The top view which shows typically the state of the deposit after passing a heating part and before passing a tension provision part. The top view which shows typically the state of the deposit after passing a tension provision part. The top view which shows typically the state of the deposit after passing a tension provision part. The figure which shows typically the sheet manufacturing apparatus which concerns on the modification of this embodiment.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. The embodiments described below do not unduly limit the contents of the present invention described in the claims. In addition, not all of the configurations described below are essential constituent requirements of the present invention.

1. Sheet manufacturing apparatus 1.1. Configuration First, a sheet manufacturing apparatus according to the present embodiment will be described with reference to the drawings. FIG. 1 is a diagram schematically illustrating a sheet manufacturing apparatus 100 according to the present embodiment.

  As shown in FIG. 1, the sheet manufacturing apparatus 100 includes a supply unit 10, a manufacturing unit 102, and a control unit 104. The manufacturing unit 102 manufactures a sheet. The manufacturing unit 102 includes a crushing unit 12, a defibrating unit 20, a sorting unit 40, a first web forming unit 45, a rotating body 49, a mixing unit 50, a depositing unit 60, and a second web forming unit. 70, a sheet forming unit 80, and a cutting unit 90.

  The supply unit 10 supplies raw materials to the crushing unit 12. The supply unit 10 is, for example, an automatic input unit for continuously supplying raw materials to the crushing unit 12. The raw material supplied by the supply part 10 contains fibers, such as a used paper and a pulp sheet, for example.

  The crushing unit 12 cuts the raw material supplied by the supply unit 10 in the air (in the air) or the like into pieces. The shape and size of the strip is, for example, a strip of several cm square. In the illustrated example, the crushing unit 12 has a crushing blade 14, and the charged raw material can be cut by the crushing blade 14. As the crushing part 12, a shredder is used, for example. The raw material cut by the crushing unit 12 is received by the hopper 1 and then transferred (conveyed) to the defibrating unit 20 through the pipe 2.

  The defibrating unit 20 defibrates the raw material cut by the crushing unit 12. Here, “defibration” means unraveling a raw material (a material to be defibrated) formed by binding a plurality of fibers into individual fibers. The defibrating unit 20 also has a function of separating substances such as resin particles, ink, toner, and a bleeding inhibitor adhering to the raw material from the fibers.

  What has passed through the defibrating unit 20 is referred to as “defibrated material”. In addition to the defibrated fibers that have been unraveled, the “defibrated material” includes resin particles (resins that bind multiple fibers together), ink, toner, etc. In some cases, additives such as colorants, anti-bleeding materials, and paper strength enhancing agents are included. The shape of the defibrated material that has been unraveled is a string shape or a ribbon shape. The unraveled defibrated material may exist in an unentangled state (independent state) with other undisentangled fibers, or entangled with other undisentangled defibrated material to form a lump. It may exist in a state (a state forming a so-called “dama”).

  The defibrating unit 20 performs defibration by a dry method. Here, performing a process such as defibration in the air (in the air), not in the liquid, is called dry. As the defibrating unit 20, an impeller mill is used in the present embodiment. The defibrating unit 20 has a function of generating an air flow that sucks the raw material and discharges the defibrated material. As a result, the defibrating unit 20 can suck the raw material together with the airflow from the introduction port 22 with the airflow generated by itself, defibrate, and transport the defibrated material to the discharge port 24. The defibrated material that has passed through the defibrating unit 20 is transferred to the sorting unit 40 via the tube 3. In addition, the airflow for conveying a defibrated material from the defibrating unit 20 to the sorting unit 40 may use an airflow generated by the defibrating unit 20, or an airflow generation device such as a blower is provided, May be used.

  The sorting unit 40 introduces the defibrated material defibrated by the defibrating unit 20 from the introduction port 42 and sorts the defibrated material according to the length of the fiber. The sorting unit 40 includes a drum unit 41 and a housing unit 43 that accommodates the drum unit 41. As the drum part 41, for example, a sieve is used. The drum portion 41 has a net (filter, screen), fibers or particles smaller than the mesh size of the mesh (one passing through the mesh, the first selection), and fibers larger than the mesh size of the mesh. Undefibrated pieces and lumps (those that do not pass through the net, second sort) can be separated. For example, the first selection is transferred to the mixing unit 50 via the pipe 7. The second selected item is returned to the defibrating unit 20 from the discharge port 44 through the pipe 8. Specifically, the drum part 41 is a cylindrical sieve that is rotationally driven by a motor. As the net of the drum portion 41, for example, a metal net, an expanded metal obtained by extending a cut metal plate, or a punching metal in which a hole is formed in the metal plate by a press machine or the like is used.

  The first web forming unit 45 conveys the first sorted product that has passed through the sorting unit 40 to the mixing unit 50. The first web forming unit 45 includes a mesh belt 46, a stretching roller 47, and a suction unit (suction mechanism) 48.

  The suction unit 48 can suck the first sorted matter dispersed in the air through the opening (opening of the mesh) of the sorting unit 40 onto the mesh belt 46. The first selection is deposited on the moving mesh belt 46 to form the web V. The basic configurations of the mesh belt 46, the stretching roller 47, and the suction unit 48 are the same as the mesh belt 72, the stretching roller 74, and the suction mechanism 76 of the second web forming unit 70 described later.

  The web V is formed in a soft and swelled state containing a lot of air by passing through the sorting unit 40 and the first web forming unit 45. The web V deposited on the mesh belt 46 is put into the tube 7 and conveyed to the mixing unit 50.

  The rotating body 49 can cut the web V before the web V is conveyed to the mixing unit 50. In the illustrated example, the rotating body 49 includes a base portion 49a and a protrusion 49b protruding from the base portion 49a. The protrusion 49b has, for example, a plate shape. In the illustrated example, four protrusions 49b are provided, and four protrusions 49b are provided at equal intervals. When the base 49a rotates in the direction R, the protrusion 49b can rotate around the base 49a. By cutting the web V by the rotating body 49, for example, the fluctuation in the amount of defibrated material per unit time supplied to the deposition unit 60 can be reduced.

The rotating body 49 is provided in the vicinity of the first web forming portion 45. In the illustrated example, the rotating body 49 is provided in the vicinity of the stretching roller 47a located on the downstream side in the path of the web V (next to the stretching roller 47a). The rotating body 49 is provided at a position where the protrusion 49b can come into contact with the web V and not in contact with the mesh belt 46 on which the web V is deposited. Thereby, it is possible to suppress the mesh belt 46 from being worn (damaged) by the protrusion 49b. The shortest distance between the protrusion 49b and the mesh belt 46 is, for example, not less than 0.05 mm and not more than 0.5 mm. This is the distance at which the web V can be cut without the mesh belt 46 being damaged.

  The mixing unit 50 mixes the first sorted product that has passed through the sorting unit 40 (the first sorted product conveyed by the first web forming unit 45) and the additive containing resin. The mixing unit 50 includes an additive supply unit 52 that supplies the additive, a pipe 54 that conveys the first selected product and the additive, and a blower 56. In the illustrated example, the additive is supplied from the additive supply unit 52 to the pipe 54 via the hopper 9. The tube 54 is continuous with the tube 7.

  In the mixing unit 50, an air flow is generated by the blower 56, and the first selection product and the additive can be mixed and conveyed in the pipe 54. In addition, the mechanism which mixes a 1st selection material and an additive is not specifically limited, It may stir with the blade | wing which rotates at high speed, and uses rotation of a container like a V-type mixer. There may be.

  As the additive supply unit 52, a screw feeder as shown in FIG. 1 or a disk feeder (not shown) is used. The additive supplied from the additive supply unit 52 includes a resin for binding a plurality of fibers. At the time when the resin is supplied, the plurality of fibers are not bound. The resin melts when passing through the sheet forming portion 80 and binds a plurality of fibers.

  The resin supplied from the additive supply unit 52 is a thermoplastic resin or a thermosetting resin. For example, AS resin, ABS resin, polypropylene, polyethylene, polyvinyl chloride, polystyrene, acrylic resin, polyester resin, polyethylene terephthalate, Polyphenylene ether, polybutylene terephthalate, nylon, polyamide, polycarbonate, polyacetal, polyphenylene sulfide, polyether ether ketone, and the like. These resins may be used alone or in combination. The additive supplied from the additive supply unit 52 may be fibrous or powdery.

  In addition to the resin that binds the fibers, the additive supplied from the additive supply unit 52 includes a colorant for coloring the fibers, a fiber agglomeration, and a resin, depending on the type of sheet to be manufactured. An agglomeration inhibitor for suppressing agglomeration of the fiber and a flame retardant for making the fiber difficult to burn may be included. The mixture (mixture of the first selection product and the additive) that has passed through the mixing unit 50 is transferred to the deposition unit 60 via the pipe 54.

  The depositing unit 60 introduces the mixture that has passed through the mixing unit 50 from the introduction port 62, loosens the entangled defibrated material (fibers), and lowers it while dispersing it in the air. Furthermore, when the additive resin supplied from the additive supply unit 52 is fibrous, the deposition unit 60 loosens the entangled resin. Thereby, the deposition unit 60 can deposit the mixture on the second web forming unit 70 with good uniformity.

  The accumulation unit 60 includes a drum unit 61 and a housing unit 63 that accommodates the drum unit 61. As the drum part 61, a rotating cylindrical sieve is used. The drum unit 61 has a net, and drops fibers or particles (those that pass through the net) included in the mixture that has passed through the mixing unit 50 that are smaller than the mesh opening size. The configuration of the drum unit 61 is the same as the configuration of the drum unit 41, for example.

  In addition, the “sieving” of the drum unit 61 may not have a function of selecting a specific object. That is, the “sieving” used as the drum part 61 means a thing provided with a net, and the drum part 61 may drop all of the mixture introduced into the drum part 61.

  The second web forming unit 70 deposits the passing material that has passed through the deposition unit 60 to form the web W. The second web forming unit 70 includes, for example, a mesh belt 72, a tension roller 74, and a suction mechanism 76.

  While moving, the mesh belt 72 accumulates the passing material that has passed through the opening of the accumulation unit 60 (the opening of the mesh). The mesh belt 72 is stretched by a stretching roller 74, and is configured to allow air to pass therethrough. The mesh belt 72 moves as the stretching roller 74 rotates. While the mesh belt 72 continuously moves, the passing material that has passed through the accumulation portion 60 is continuously piled up, whereby the web W is formed on the mesh belt 72. The mesh belt 72 is made of, for example, metal, resin, cloth, or non-woven fabric.

  The suction mechanism 76 is provided below the mesh belt 72 (on the side opposite to the accumulation unit 60 side). The suction mechanism 76 can generate an air flow directed downward (air flow directed from the accumulation unit 60 toward the mesh belt 72). By the suction mechanism 76, the mixture dispersed in the air by the deposition unit 60 can be sucked onto the mesh belt 72. Thereby, the discharge speed from the deposition part 60 can be increased. Furthermore, the suction mechanism 76 can form a downflow in the dropping path of the mixture, and can prevent the defibrated material and additives from being entangled during the dropping.

  As described above, the web W in a state where it contains a lot of air and is softly swollen is formed by passing through the deposition unit 60 and the second web forming unit 70 (web forming step). The web W deposited on the mesh belt 72 is conveyed to the sheet forming unit 80.

  In the illustrated example, a humidity control unit 78 that adjusts the humidity of the web W is provided. The humidity control unit 78 can adjust the amount ratio of the web W and water by adding water or water vapor to the web W.

  The sheet forming unit 80 forms the sheet S by pressurizing and heating the web W deposited on the mesh belt 72. In the sheet forming unit 80, by heating the mixture of the defibrated material and the additive mixed in the web W, the plurality of fibers in the mixture are bound to each other via the additive (resin). Can do.

  The sheet forming unit 80 includes a pressurizing unit 82 that pressurizes the web W, and a heating unit 84 that heats the web W pressed by the pressurizing unit 82. The pressurizing unit 82 includes a pair of calendar rollers 85 and applies pressure to the web W. The web W is pressed to reduce its thickness, and the density of the web W is increased. As the heating unit 84, for example, a heating roller (heater roller), a hot press molding machine, a hot plate, a hot air blower, an infrared heater, or a flash fixing device is used. In the illustrated example, the heating unit 84 includes a pair of heating rollers 86. By forming the heating unit 84 as the heating roller 86, the sheet S is formed while the web W is continuously conveyed as compared with the case where the heating unit 84 is configured as a plate-like pressing device (flat plate pressing device). Can do. For example, the calendar roller 85 and the heating roller 86 are arranged so that their rotation axes are parallel to each other. Here, the calendar roller 85 (pressure unit 82) can apply a pressure higher than the pressure applied to the web W by the heating roller 86 (heating unit 84). The number of calendar rollers 85 and heating rollers 86 is not particularly limited.

The cutting unit 90 cuts the sheet S formed by the sheet forming unit 80. In the illustrated example, the cutting unit 90 includes a first cutting unit 92 that cuts the sheet S in a direction that intersects the conveyance direction of the sheet S, and a second cutting unit 94 that cuts the sheet S in a direction parallel to the conveyance direction. ,have.
The second cutting unit 94 cuts the sheet S that has passed through the first cutting unit 92, for example.

  Thus, a single-sheet sheet S having a predetermined size is formed. The cut sheet S is discharged to the discharge unit 96.

1.2. FIG. 2 is a diagram schematically showing the vicinity of the sheet forming unit 80 of the sheet manufacturing apparatus 100. As shown in FIG. 2, the sheet manufacturing apparatus 100 includes a tension applying unit 110. 3 is a cross-sectional view taken along the line III-III in FIG. FIG. 4 is a perspective view schematically showing the tension applying unit 110.

  As shown in FIG. 2, the tension applying unit 110 is disposed between the pressurizing unit 82 and the heating unit 84. That is, the deposit (web W) passes through the pressurizing unit 82, contacts the tension applying unit 110, and then passes through the heating unit 84. The pressurizing unit 82 pressurizes the web W deposited by the deposition unit 60. The heating unit 84 heats the web W pressed by the pressing unit 82. The defibrating unit 20 defibrates the raw material containing the fibers in the air. The mixing unit 50 mixes the defibrated material and the resin defibrated by the defibrating unit 20 in the air. The depositing unit 60 deposits the mixture mixed by the mixing unit 50.

  As shown in FIGS. 2 to 4, the tension applying unit 110 includes a tension roller 112, a support body 114, and a fixing unit (swing support shaft) 116. For convenience, FIG. 2 shows the tension applying unit 110 in a simplified manner. In FIG. 3, the support 114 is not shown.

  The tension roller 112 is in contact with the web W. The shape of the tension roller 112 is, for example, a cylindrical shape. The tension roller 112 can rotate around the rotation axis Q as the web W is conveyed. The rotation axis Q of the tension roller 112 is parallel to the width direction of the web W. Here, the “width direction” is a direction orthogonal to the conveyance direction α (see FIG. 2) of the web W and is orthogonal to the thickness direction of the web W. The rotation axis Q is parallel to the rotation axis of the calendar roller 85.

  The support body 114 supports the tension roller 112 so as to be rotatable about the rotation axis Q. The support body 114 can swing around the fixed portion 116. The support 114 can translate the rotational axis Q of the tension roller 112 by swinging. In the example shown in FIG. 4, the support body 114 has side wall parts 114a and 114b and a bottom part 114c. The first side wall portion 114 a connects one end portion of the tension roller 112 and one end portion of the fixing portion 116. The second side wall portion 114b connects the other end portion of the tension roller 112 and the other end portion of the fixing portion 116. The bottom 114c connects the first side wall 114a and the second side wall 114b. In addition, the support body 114 can also be comprised without providing the bottom part 114c.

  The fixing portion 116 is connected to the support body 114. The shape of the fixing part 116 is, for example, a cylindrical shape. In the example illustrated in FIG. 2, the fixing unit 116 is located on one side of the virtual straight line L that passes through the contact portion between the web W and the pressurizing unit 82 and the contact portion between the web W and the heating unit 84. On the other side of L, the tension roller 112 (the web W of the tension roller 112 and the contact portion) is located.

The tension applying unit 110 can apply (apply) a force in the direction β to the web W by, for example, the weight of the tension roller 112. Here, FIG. 5 is a perspective view schematically illustrating a state in which the web W is not deformed by the tension applying unit 110 (a form in which the tension applying unit 110 is not provided). FIG. 6 is a perspective view schematically showing a state in which the web W is deformed by the tension applying unit 110. The tension applying unit 110 deforms the web W so that the path length of the web W is the same in the width direction of the web W. Therefore, the first path length K1, the second path length K2, and the third path length K3 shown in FIG. 6 are equal to each other. Here, in the present embodiment, the path length of the web W is, for example, the length of the path along which the web W from the pressure unit 82 to the heating unit 84 is conveyed. The path lengths K1, K2, and K3 are path lengths from the pressurizing unit 82 to the heating unit 84, and the first path length K1 and the third path length K3 are end portions (side end portions) in the width direction. The second path length K2 is the path length at the center in the width direction. In the example illustrated in FIG. 6, the path length of the web W is the path length from the pressurizing unit 82 to the heating unit 84, and is also the length of the web W along the path. For convenience, in FIG. 5 and FIG. 6, illustration of one roller of the pressure unit 82 and the heating unit 84, the support body 114, and the fixing unit 116 is omitted.

  7 is a cross-sectional view taken along line VII-VII in FIG. For the sake of convenience, in FIG. 7, the illustration of one calendar roller 85 and the web W of the pressure unit 82 is omitted.

  The shape of the calendar roller 85 of the pressurizing unit 82 is, for example, an inverted crown shape as shown in FIG. That is, in the width direction of the calendar roller 85, the thickness of the calendar roller 85 (diameter) gradually decreases from the end toward the center. In other words, the calendar roller 85 has a drum shape. Of the two calendar rollers 85, the two calendar rollers 85 may have a reverse crown shape, one of the calendar rollers 85 has a reverse crown shape, and the other of the calendar rollers 85 has a cylindrical shape. There may be.

  The sheet manufacturing apparatus 100 has the following features, for example.

  The sheet manufacturing apparatus 100 includes a tension applying unit 110 that is disposed between the pressure unit 82 and the heating unit 84 and deforms the web W so that the path length of the web W is the same in the width direction of the web W. Therefore, in the sheet manufacturing apparatus 100, even if the pressure applied to the web W by the pressure unit 82 is not uniform in the width direction of the web W and the amount of elongation of the web W is different in the width direction, the tension applying unit 110 The difference in the elongation amount of the web W in the direction can be reduced (for example, the elongation amount of the web W in the width direction can be made the same). As a result, the sheet manufacturing apparatus 100 can suppress the occurrence of undulation in the sheet S. Hereinafter, the reason why the difference in the amount of elongation of the web W in the width direction can be reduced by the tension applying unit 110 will be described with reference to FIGS. 8 and 9.

  FIG. 8 is a plan view schematically showing the state of the web W after passing through the pressurizing unit 82 and before passing through the tension applying unit 110 (in contact with the tension applying unit 110). FIG. 9 is a plan view schematically showing the state of the web W after passing through the tension applying unit 110.

  As shown in FIG. 8, after passing through the pressurizing unit 82 and before passing through the tension applying unit 110, in the web W, for example, the extension amount ΔEe of the end portion in the width direction is the center portion in the width direction. Is larger than the amount of elongation ΔEc. For example, since the shape of the calendar roller 85 of the pressing unit 82 is an inverted crown shape (see FIG. 7), the elongation amount ΔEe is larger than the elongation amount ΔEc. Thus, before passing through the tension applying unit 110, the amount of elongation of the web W differs in the width direction.

The tension applying unit 110 deforms the web W so that the path length of the web W is the same in the width direction of the web W. Therefore, a large pressure is applied by the tension applying unit 110 in a portion where the elongation amount of the web W is small (the tension applied to the web W is large), and a small amount is applied by the tension applying unit 110 in a portion where the elongation amount of the web W is large. Pressure is applied (the tension applied to the web W is small). Thereby, as shown in FIG. 9, the elongation amount of the web W can be made the same in the width direction. Further, the thickness of the web W can be the same in the width direction. The tension applying unit 110 can come into contact with the web W before the web W passes through the heating unit 84. Therefore, before the structure of the web W is fixed (the defibrated material is bound and fixed by the resin), the tension applying unit 110 can apply pressure to the web W, as shown in FIG. In addition, the web W can be deformed by the tension applying unit 110.

  If the tension applying unit 110 applies a uniform pressure to the web W in the width direction, the distribution of elongation generated by passing through the pressing unit 82 cannot be eliminated as shown in FIG. Therefore, undulation occurs at the end of the web W (sheet S) having a large elongation. In addition, if the web W comes into contact with the tension applying unit 110 after the structure of the web W is fixed, the tension applying unit 110 cannot eliminate the distribution of the elongation amount, and the web W ( Swelling occurs at the end of the sheet S).

  Further, the tension applying unit 110 can relieve the force applied to the web W due to the difference between the rotation speed of the calendar roller 85 and the rotation speed of the heating roller 86. For this reason, the tension applying unit 110 can improve the stability of the conveyance of the web W and suppress wrinkles from being generated on the web W.

  In the sheet manufacturing apparatus 100, the tension applying unit 110 includes a tension roller 112 that contacts the web W and a swingable support body 114 that rotatably supports the tension roller 112. And a support 114 that translates the rotation axis Q. The rotation axis Q is parallel to the width direction of the web W. Therefore, in the sheet manufacturing apparatus 100, the tension applying unit 110 can deform the web W so that the path length of the web W is the same in the width direction of the web W.

  In the sheet manufacturing apparatus 100, the pressure unit 82 includes a calendar roller 85 having an inverted crown shape. Therefore, in the sheet manufacturing apparatus 100, it is possible to suppress wrinkles from occurring at the end in the width direction of the web W by passing through the pressurizing unit 82. For example, when the shape of the calendar roller 85 is a columnar shape, the web W may be folded at the end in the width direction of the web W, and wrinkles may occur. Furthermore, in the sheet manufacturing apparatus 100, even if the shape of the calendar roller 85 is an inverted crown shape, the tension applying unit 110 can reduce the difference in the elongation amount of the web W in the width direction.

  In the above description, the example in which the tension applying unit 110 includes the tension roller 112 has been described. However, the tension applying unit 110 may include a press device.

  In the sheet manufacturing apparatus according to the present invention, the defibrated material that has passed through the defibrating unit 20 may be transferred to a classifying unit (not shown) via the pipe 3. Then, the classified product classified in the classification unit may be conveyed to the sorting unit 40. The classifying unit classifies the defibrated material that has passed through the defibrating unit 20. Specifically, the classifying unit separates and removes relatively small ones or low density ones (resin particles, colorants, additives, etc.) among the defibrated material. Thereby, the ratio for which the fiber which is a comparatively large or high density thing among defibrated materials can be raised. As the classification unit, for example, a cyclone, an elbow jet, an eddy classifier, or the like is used.

2. Next, a sheet manufacturing apparatus according to a modification of the present embodiment will be described with reference to the drawings. FIG. 11 is a diagram schematically illustrating a sheet manufacturing apparatus 200 according to a modification of the present embodiment. FIG. 11 shows the vicinity of the tension applying unit 110 of the sheet manufacturing apparatus 200.

  Hereinafter, in the sheet manufacturing apparatus 200 according to the modification of the present embodiment, members having the same functions as the constituent members of the sheet manufacturing apparatus 100 according to the present embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. To do.

  In the sheet manufacturing apparatus 100 described above, as illustrated in FIG. 2, the tension applying unit 110 is disposed between the pressurizing unit 82 and the heating unit 84. In contrast, in the sheet manufacturing apparatus 200, the tension applying unit 110 is disposed on the downstream side of the heating unit 84 as illustrated in FIG. 11. Specifically, the sheet manufacturing apparatus 200 includes a conveyance unit 120 that conveys the web W (sheet S) heated by the heating unit 84, and the tension applying unit 110 is provided between the heating unit 84 and the conveyance unit 120. Has been placed. That is, the web W passes through the heating unit 84, contacts the tension applying unit 110, and then passes through the conveyance unit 120. The tension applying unit 110 deforms the web W so that the path length of the web W is the same in the width direction of the web W. Immediately after heating by the heating unit 84, since the resin is soft (not solidified), the web W (sheet S) can be deformed (elongated) in the path direction, and the sheet S with less undulation is obtained. Can be molded. In the present modification, the path length of the web W is, for example, the length of the path along which the web W from the heating unit 84 to the transport unit 120 is transported.

  The transport unit 120 includes a pair of transport rollers 122. The conveyance unit 120 is provided on the upstream side of the cutting unit 90, for example. Specifically, the conveyance unit 120 is disposed between the heating unit 84 and the cutting unit 90. The shape of the transport roller 122 is, for example, a cylindrical shape. The shape of the heating roller 86 of the heating unit 84 is, for example, an inverted crown shape (see FIG. 7).

  The sheet manufacturing apparatus 200 has the following features, for example.

  In the sheet manufacturing apparatus 200, the tension applying unit 110 is disposed between the heating unit 84 and the conveyance unit 120. Therefore, the tension applying unit 110 contacts the web W immediately after passing through the heating unit 84. Immediately after passing through the heating unit 84, the structure of the web W is not fixed. Therefore, in the sheet manufacturing apparatus 200, as in the sheet manufacturing apparatus 100, the web W can be deformed by the tension applying unit 110 so that the stretch amount of the web W is the same in the width direction.

  In the sheet manufacturing apparatus 200, the heating unit 84 includes a heating roller 86 having an inverted crown shape. Therefore, in the sheet manufacturing apparatus 200, it is possible to prevent wrinkles from occurring at the end in the width direction of the web W by passing through the heating unit 84.

  In the sheet manufacturing apparatus according to the present invention, the tension applying unit 110 may be disposed between the pressurizing unit 82 and the heating unit 84, and may be disposed between the heating unit 84 and the conveying unit 120. Good.

Further, the sheet S manufactured by the sheet manufacturing apparatus according to the present invention mainly refers to a sheet shape. However, it is not limited to a sheet shape, and may be a board shape or a web shape. The sheet in this specification is divided into paper and non-woven fabric. The paper includes a mode in which pulp or used paper is used as a raw material and is formed into a thin sheet, and includes recording paper for writing and printing, wallpaper, wrapping paper, colored paper, drawing paper, Kent paper, and the like. Non-woven fabrics are thicker or lower in strength than paper. General non-woven fabrics, fiber boards, tissue paper (cleaning tissue paper), kitchen paper, cleaners, filters, liquid (waste ink and oil) absorbents, sound absorbing materials, Insulating materials, cushioning materials, mats, etc. 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 invention, a part of the configuration may be omitted within a range having the characteristics and effects described in the present application, or each embodiment or modification may be combined. Note that the manufacturing unit 102 may omit a part of the configuration, add another configuration, or replace it with a known configuration as long as the sheet can be manufactured.

  The present invention includes configurations that are substantially the same as the configurations described in the embodiments (for example, configurations that have the same functions, methods, and results, or configurations that have the same objects and effects). In addition, the invention includes a configuration in which a non-essential part of the configuration described in the embodiment is replaced. In addition, the present invention includes a configuration that exhibits the same operational effects as the configuration described in the embodiment or a configuration that can achieve the same object. Further, the invention includes a configuration in which a known technique is added to the configuration described in the embodiment.

DESCRIPTION OF SYMBOLS 1 ... Hopper, 2, 3, 7, 8 ... Pipe | tube, 9 ... Hopper, 10 ... Supply part, 12 ... Roughing part, 14 ... Roughing blade, 20 ... Defibration part, 22 ... Introduction port, 24 ... Discharge port , 40 ... sorting part, 41 ... drum part, 42 ... introduction port, 43 ... housing part, 44 ... discharge port, 45 ... first web forming part, 46 ... mesh belt, 47, 47a ... stretching roller, 48 ... suction , 49 ... Rotating body, 49 a ... Base, 49 b ... Projection, 50 ... Mixing part, 52 ... Additive supply part, 54 ... Pipe, 56 ... Blower, 60 ... Deposition part, 61 ... Drum part, 62 ... Inlet , 63 ... housing part, 70 ... second web forming part, 72 ... mesh belt, 74 ... tension roller, 76 ... suction mechanism, 78 ... humidity control part, 80 ... sheet forming part, 82 ... pressurizing part, 84 ... Heating unit, 85 ... calendar roller, 86 ... heating roller, 90 ... Cutting section, 92 ... first cutting section, 94 ... second cutting section, 96 ... discharge section, 100 ... sheet manufacturing apparatus, 102 ... manufacturing section, 104 ... control section, 110 ... tension applying section, 112 ... tension roller, 114 DESCRIPTION OF SYMBOLS ... Support body, 114a ... 1st side wall part, 114b ... 2nd side wall part, 114c ... Bottom part, 116 ... Fixing part, 120 ... Conveyance part, 122 ... Conveyance roller, 200 ... Sheet manufacturing apparatus, K1 ... 1st path length, K2: Second path length, K3: Third path length, L: Virtual straight line, Q: Rotating axis, R: Direction, S: Sheet, V, W ... Web, α, β ... Direction, ΔEc, ΔEe ... Elongation

Claims (5)

A defibrating unit for defibrating raw materials containing fibers in air,
A mixing unit for mixing the defibrated material and the resin defibrated by the defibrating unit in the air;
A depositing section for depositing the mixture mixed by the mixing section;
A pressurizing unit that pressurizes the deposit deposited by the depositing unit;
A heating unit for heating the deposit pressed by the pressing unit;
Disposed between at least one of the pressurizing unit and the heating unit and downstream of the heating unit, the deposit is deformed so that the path length of the deposit is the same in the width direction of the deposit. A tensioning unit;
A sheet manufacturing apparatus comprising: A transport unit that transports the deposit heated by the heating unit;
The sheet manufacturing apparatus according to claim 1, wherein the tension applying unit is disposed between the heating unit and the transport unit. The tension applying unit is
A tension roller in contact with the deposit;
A swingable support that rotatably supports the tension roller, and a support that translates the rotation axis of the tension roller by swinging;
Have
The sheet manufacturing apparatus according to claim 1, wherein a rotation axis of the tension roller is parallel to the width direction.   4. The sheet manufacturing apparatus according to claim 1, wherein the pressurizing unit includes an inverted crown-shaped roller. 5.   The sheet manufacturing apparatus according to claim 1, wherein the heating unit includes a reverse crown-shaped roller.

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