JP6804837B2 - Sheet manufacturing equipment - Google Patents

Description

The present invention relates to a sheet manufacturing apparatus.

Conventionally, in a sheet manufacturing apparatus, a so-called wet method has been adopted in which a raw material containing fibers is put into water, dissociated mainly by mechanical action, and re-extracted. Such a wet type sheet manufacturing apparatus requires a large amount of water, and the apparatus becomes large. In addition, it takes time and effort to maintain the water treatment facility, and the energy required for the drying process increases. Therefore, in order to reduce the size and save energy, a dry sheet manufacturing apparatus that does not use water as much as possible has been proposed.

For example, in Patent Document 1, in a thin-walled sheet winding device, a weight roll that is arranged so as to be able to advance and retreat to apply a constant tension to the sheet material, and a weight roll that is arranged on the rear stage side of the weight roll and the tension of the sheet material. It is described that the tension detecting means for detecting the above is provided and the control means for controlling the servomotor to keep the tension of the sheet material constant based on the detection signal from the tension detecting means.

Japanese Unexamined Patent Publication No. 11-60003

In the sheet manufacturing apparatus, for example, after the web is pressed by a pressure roller, the web is further heated by 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, the sheet will swell. Therefore, it is conceivable to make the amount of elongation of the web uniform by adding tension. However, for example, the technique of Patent Document 1 is a technique relating 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 product is bound by a resin). A force is applied by a weight roll to the one (in the fixed state). Therefore, if 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 having a fixed structure, so that 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 waviness of a sheet.

The present invention has been made to solve at least a part of the above-mentioned problems, and can be realized as the following aspects or application examples.

One aspect of the sheet manufacturing apparatus according to the present invention is
A defibration section that defibrates raw materials containing fibers in the air,
A mixing section in which the defibrated product defibrated by the defibrating section and the resin are mixed in the air,
A depositing part for depositing the mixture mixed by the mixing part,
A pressurizing part that pressurizes the sediment deposited by the depositing part,
A heating unit that heats the deposits pressurized by the pressure unit,
It is arranged between the pressurizing section and the heating section and at least one of the downstream sides of the heating section, and deforms the deposit so that the path length of the deposit is the same in the width direction of the deposit. Tension giving part and
To be equipped.

In such a sheet manufacturing apparatus, even if the pressure applied to the deposit by the pressurizing portion 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 portion causes the deposit in the width direction. The difference in the amount of sediment elongation 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 for transporting the deposits heated by the heating unit is provided.
The tension applying portion may be arranged between the heating portion and the transport portion.

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 portion is
A tension roller in contact with the deposit and
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 rotation axis of the tension roller may be parallel to the width direction.

In such a sheet manufacturing apparatus, the tensioning portion can deform the sediment so that the path length of the sediment is the same in the width direction of the sediment.

In the sheet manufacturing apparatus according to the present invention
The pressurizing portion may have a roller having an inverted crown shape.

In such a sheet manufacturing apparatus, it is possible to prevent the formation of wrinkles at the edges in the width direction of the deposit by passing through the pressurized portion.

In the sheet manufacturing apparatus according to the present invention
The heating portion may have a roller having an inverted crown shape.

In such a sheet manufacturing apparatus, it is possible to prevent the formation of wrinkles at the edges in the width direction of the deposit by passing through the heating portion.

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. The cross-sectional view which shows typically the sheet manufacturing apparatus which concerns on this embodiment. The perspective view which shows typically the tension giving part of the sheet manufacturing apparatus which concerns on this embodiment. The perspective view which shows typically the state which the deposit is not deformed by the tensioning part. The perspective view which shows typically the state which the deposit is deformed by the tensioning part. The cross-sectional view which shows typically the sheet manufacturing apparatus which concerns on this embodiment. The plan view which shows typically the state of the deposit after passing through a heating part and before passing through a tensioning part. The plan view which shows typically the state of the sediment after passing through the tensioning part. The plan view which shows typically the state of the sediment after passing through the tensioning part. The figure which shows typically the sheet manufacturing apparatus which concerns on the modification of this embodiment.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the embodiments described below do not unreasonably limit the contents of the present invention described in the claims. Moreover, not all of the configurations described below are essential constituent requirements of the present invention.

1. 1. Sheet manufacturing equipment 1.1. Configuration First, the sheet manufacturing apparatus according to the present embodiment will be described with reference to the drawings. FIG. 1 is a diagram schematically showing 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 the sheet. The manufacturing unit 102 includes a coarse crushing unit 12, a defibration 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. It has a 70, a sheet forming portion 80, and a cutting portion 90.

The supply unit 10 supplies the raw material to the coarse crushing unit 12. The supply unit 10 is, for example, an automatic charging unit for continuously charging the raw material into the coarse crushing unit 12. The raw material supplied by the supply unit 10 includes fibers such as used paper and pulp sheet.

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

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

A product that has passed through the defibration section 20 is called a "defibration product". "Fibers" includes, in addition to the unraveled defibrated fibers, resin grains (resin for binding multiple fibers) separated from the fibers when the fibers are unraveled, ink, toner, etc. It may also contain additives such as colorants, bleeding preventives, and paper strength enhancers. The shape of the unraveled defibrated product is a string-like shape or a flat string-like shape. The unraveled fiber may exist in an unentangled state (independent state) with other unraveled fibers, or may be entangled with other unraveled fibers to form a lump. It may exist in a state (a state forming a so-called "lump").

The defibration unit 20 performs defibration in a dry manner. Here, performing a process such as defibration in the air (in the air) or the like, not in a liquid, is referred to as a dry method. An impeller mill is used as the defibrating portion 20 in this embodiment. The defibration unit 20 has a function of sucking the raw material and generating an air flow that discharges the defibrated product. As a result, the defibration unit 20 can suck the raw material together with the airflow from the introduction port 22 by the airflow generated by itself, perform the defibration treatment, and convey the defibrated product to the discharge port 24. The defibrated product that has passed through the defibrating section 20 is transferred to the sorting section 40 via the tube 3. As the airflow for transporting the defibrated product from the defibration unit 20 to the sorting unit 40, the airflow generated by the defibration unit 20 may be used, or an airflow generator such as a blower is provided to provide the airflow. You may use it.

The sorting unit 40 introduces the defibrated product defibrated by the defibrating unit 20 from the introduction port 42 and sorts the fibers according to the length of the fibers. The sorting unit 40 has a drum unit 41 and a housing unit 43 that houses the drum unit 41. As the drum portion 41, for example, a sieve is used. The drum portion 41 has a mesh (filter, screen), and has fibers or particles smaller than the mesh size of the mesh (those that pass through the mesh, the first selection), and fibers or particles larger than the mesh size of the mesh. It can be separated from undissolved pieces and lumps (those that do not pass through the net, second selection). For example, the first sort is transferred to the mixing section 50 via the pipe 7. The second sort is returned from the discharge port 44 to the defibration section 20 via the pipe 8. Specifically, the drum portion 41 is a cylindrical sieve that is rotationally driven by a motor. As the net of the drum portion 41, for example, a wire mesh, an expanded metal obtained by stretching a metal plate having a cut, 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 portion 45 includes a mesh belt 46, a tension roller 47, and a suction portion (suction mechanism) 48.

The suction unit 48 can suck the first sorted material dispersed in the air through the opening (opening of the net) of the sorting unit 40 onto the mesh belt 46. The first sort is deposited on the moving mesh belt 46 to form the web V. The basic configuration of the mesh belt 46, the tension roller 47, and the suction portion 48 is the same as that of the mesh belt 72, the tension roller 74, and the suction mechanism 76 of the second web forming portion 70, which will be described later.

The web V is formed in a soft and bulging state containing a large amount of air by passing through the sorting section 40 and the first web forming section 45. The web V deposited on the mesh belt 46 is charged into the pipe 7 and conveyed to the mixing section 50.

The rotating body 49 can cut the web V before it is conveyed to the mixing unit 50. In the illustrated example, the rotating body 49 has a base portion 49a and a protrusion 49b protruding from the base portion 49a. The protrusion 49b has, for example, a plate-like shape. In the illustrated example, four protrusions 49b are provided, and four protrusions 49b are provided at equal intervals. By rotating the base portion 49a in the direction R, the protrusion portion 49b can rotate about the base portion 49a. By cutting the web V by the rotating body 49, for example, the fluctuation of the amount of defibrated product per unit time supplied to the depositing portion 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 (next to the tension roller 47a) in the vicinity of the tension roller 47a located on the downstream side in the path of the web V. The rotating body 49 is provided at a position where the protrusion 49b can come into contact with the web V and does not come into contact with the mesh belt 46 on which the web V is deposited. As a result, it is possible to prevent 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, 0.05 mm or more and 0.5 mm or less. This is the distance at which the mesh belt 46 can cut the web V without being damaged.

The mixing unit 50 mixes the first sorted product (the first sorted product conveyed by the first web forming unit 45) that has passed through the sorting unit 40 and the additive containing the resin. The mixing unit 50 includes an additive supply unit 52 for supplying the additive, a pipe 54 for transporting the first selection 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 pipe 54 is continuous with the pipe 7.

In the mixing unit 50, an air flow is generated by the blower 56, and the first selected product and the additive can be conveyed while being mixed in the pipe 54. The mechanism for mixing the first sorted product and the additive is not particularly limited, and may be agitated by blades rotating at high speed, or may use the rotation of the 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 disc feeder (not shown) is used. The additive supplied from the additive supply unit 52 contains a resin for binding a plurality of fibers. At the time the resin was supplied, the plurality of fibers were not bound. The resin melts as it passes through the sheet forming portion 80 to bind 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, and the like. Polyphenylene ether, polybutylene terephthalate, nylon, polyamide, polycarbonate, polyacetal, polyphenylene sulfide, polyether ether ketone, and the like. These resins may be used alone or in admixture. The additive supplied from the additive supply unit 52 may be in the form of fibers or in the form of powder.

In addition to the resin that binds the fibers, the additives supplied from the additive supply unit 52 include a colorant for coloring the fibers, agglomeration of the fibers, and a resin, depending on the type of sheet to be manufactured. It may contain a coagulation inhibitor for suppressing coagulation and a flame retardant for making fibers and the like hard to burn. The mixture (mixture of the first selection and the additive) that has passed through the mixing section 50 is transferred to the deposit section 60 via the pipe 54.

The depositing portion 60 introduces the mixture that has passed through the mixing portion 50 from the introduction port 62, loosens the entangled defibrated products (fibers), and drops the mixture while dispersing it in the air. Further, when the resin of the additive supplied from the additive supply unit 52 is fibrous, the depositing portion 60 loosens the entangled resin. As a result, the depositing portion 60 can uniformly deposit the mixture on the second web forming portion 70.

The depositing portion 60 has a drum portion 61 and a housing portion 63 for accommodating the drum portion 61. As the drum portion 61, a rotating cylindrical sieve is used. The drum portion 61 has a mesh and allows fibers or particles (those passing through the mesh) smaller than the size of the mesh of the mesh contained in the mixture that has passed through the mixing section 50 to fall. The configuration of the drum portion 61 is, for example, the same as the configuration of the drum portion 41.

The "sieve" of the drum portion 61 may not have a function of selecting a specific object. That is, the "sieve" used as the drum portion 61 means that the drum portion 61 is provided with a net, and the drum portion 61 may drop all of the mixture introduced into the drum portion 61.

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

The mesh belt 72 deposits the passing material that has passed through the opening (opening of the net) of the depositing portion 60 while moving. The mesh belt 72 is stretched by a tension roller 74, and has a structure that makes it difficult for passing objects to pass through and allows air to pass through. The mesh belt 72 moves by rotating the tension roller 74. The web W is formed on the mesh belt 72 by continuously accumulating the passing objects that have passed through the deposition portion 60 while the mesh belt 72 continuously moves. The mesh belt 72 is made of, for example, metal, resin, cloth, non-woven fabric, or the like.

The suction mechanism 76 is provided below the mesh belt 72 (on the side opposite to the deposition portion 60 side). The suction mechanism 76 can generate a downward airflow (airflow from the deposit 60 toward the mesh belt 72). The suction mechanism 76 allows the mixture dispersed in the air by the deposit 60 to be sucked onto the mesh belt 72. As a result, the discharge rate from the depositing portion 60 can be increased. Further, the suction mechanism 76 can form a downflow in the fall path of the mixture, and can prevent the defibrate and additives from being entangled during the fall.

As described above, the web W in a soft and swollen state containing a large amount of air is formed by passing through the deposition portion 60 and the second web forming portion 70 (web forming step). The web W deposited on the mesh belt 72 is conveyed to the sheet forming portion 80.

In the illustrated example, a humidity control unit 78 for controlling the humidity of the web W is provided. The humidity control unit 78 can adjust the amount ratio of the web W to water by adding water or steam to the web W.

The sheet forming portion 80 pressurizes and heats the web W deposited on the mesh belt 72 to form the sheet S. In the sheet forming unit 80, a plurality of fibers in the mixture are bound to each other via the additive (resin) by applying heat to the mixture of the defibrated product and the additive mixed in the web W. Can be done.

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 pressurized by the pressurizing unit 82. The pressurizing section 82 is composed of a pair of calendar rollers 85, and applies pressure to the web W. When the web W is pressurized, its thickness is reduced 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, and a flash fixing device are used. In the illustrated example, the heating unit 84 includes a pair of heating rollers 86. By configuring the heating unit 84 as a heating roller 86, the sheet S is formed while continuously conveying the web W as compared with the case where the heating unit 84 is configured as a plate-shaped press device (flat plate press device). Can be done. The calendar roller 85 and the heating roller 86 are arranged so that their rotation axes are parallel to each other, for example. Here, the calendar roller 85 (pressurizing unit 82) can apply a pressure higher to the web W 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 portion 90 cuts the sheet S formed by the sheet forming portion 80. In the illustrated example, the cutting portion 90 includes a first cutting portion 92 that cuts the sheet S in a direction intersecting the conveying direction of the sheet S, and a second cutting portion 94 that cuts the sheet S in a direction parallel to the conveying direction. ,have.
The second cutting portion 94 cuts, for example, the sheet S that has passed through the first cutting portion 92.

As described above, a single sheet S having a predetermined size is formed. The cut sheet S of the cut sheet is discharged to the discharge unit 96.

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

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

As shown in FIGS. 2 to 4, the tension applying portion 110 includes a tension roller 112, a support 114, and a fixing portion (swing support shaft) 116. For convenience, FIG. 2 shows the tension applying portion 110 in a simplified manner. Further, 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 columnar shape. The tension roller 112 can rotate about 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 transport direction α (see FIG. 2) of the web W, and is a direction orthogonal to the thickness direction of the web W. Further, the rotation axis Q is parallel to the rotation axis of the calendar roller 85.

The support 114 rotatably supports the tension roller 112 about the rotation axis Q. The support 114 can swing around the fixed portion 116 as an axis. By swinging the support 114, the rotation axis Q of the tension roller 112 can be translated. In the example shown in FIG. 4, the support 114 has side wall portions 114a and 114b and a bottom portion 114c. The first side wall portion 114a connects one end of the tension roller 112 and one end of the fixing portion 116. The second side wall portion 114b connects the other end of the tension roller 112 and the other end of the fixing portion 116. The bottom portion 114c connects the first side wall portion 114a and the second side wall portion 114b. The support 114 can also be configured without providing the bottom 114c.

The fixing portion 116 is connected to the support 114. The shape of the fixed portion 116 is, for example, a columnar shape. In the example shown in FIG. 2, the fixing portion 116 is located on one side of the virtual straight line L passing through the contact portion between the web W and the pressurizing portion 82 and the contact portion between the web W and the heating portion 84, and the virtual straight line 116 is located. The tension roller 112 (contact portion with the web W of the tension roller 112) is located on the other side of L.

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 showing a state in which the web W is not deformed by the tension applying portion 110 (a form in which the tension applying portion 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 portion 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 through which the web W is conveyed from the pressurizing section 82 to the heating section 84. The path lengths K1, K2, and K3 are the path lengths from the pressurizing section 82 to the heating section 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 in the central portion in the width direction. In the example shown in FIG. 6, the path length of the web W is both the path length from the pressurizing section 82 to the heating section 84 and the length of the web W along the path. For convenience, in FIGS. 5 and 6, one roller of the pressurizing section 82 and the heating section 84, the support 114, and the fixing portion 116 are not shown.

FIG. 7 is a sectional view taken along line VII-VII of FIG. 2 schematically showing the pressurizing portion 82. For convenience, FIG. 7 omits the illustration of one of the calendar rollers 85 and the web W of the pressurizing unit 82.

As shown in FIG. 7, the shape of the calendar roller 85 of the pressurizing unit 82 is, for example, an inverted crown shape. That is, in the width direction of the calendar roller 85, the thickness (diameter) of the calendar roller 85 gradually decreases from the end to the center. In other words, the shape of the calendar roller 85 is drum-shaped. Of the two calendar rollers 85, the shape of the two calendar rollers 85 may be an inverted crown shape, the shape of one calendar roller 85 is an inverted crown shape, and the shape of the other calendar roller 85 is a columnar shape. There may be.

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

The sheet manufacturing apparatus 100 includes a tension applying unit 110 which is arranged between the pressurizing 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 pressurizing 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 causes the width. The difference in the amount of elongation of the web W in the direction can be made small (for example, the amount of elongation of the web W in the width direction is the same). As a result, in the sheet manufacturing apparatus 100, it is possible to suppress the occurrence of waviness in the sheet S. Hereinafter, with reference to FIGS. 8 and 9, 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 portion 110 will be described.

FIG. 8 is a plan view schematically showing the state of the web W after passing through the pressurizing section 82 and before passing through the tension applying section 110 (contacting the tension applying section 110). FIG. 9 is a plan view schematically showing the state of the web W after passing through the tension applying portion 110.

As shown in FIG. 8, after passing through the pressurizing portion 82 and before passing through the tension applying portion 110, in the web W, for example, the elongation amount ΔEe of the end portion in the width direction is the central 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 pressurizing unit 82 is an inverted crown shape (see FIG. 7), the elongation amount ΔEe is larger than the elongation amount ΔEc. As described above, before passing through the tension applying portion 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 portion 110 in the portion where the amount of elongation of the web W is small (the tension applied to the web W is large), and is small by the tension applying portion 110 in the portion where the amount of elongation of the web W is large. Pressure is applied (the tension applied to the web W is small). As a result, as shown in FIG. 9, the amount of elongation 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 product is bound and fixed by the resin), the tension applying portion 110 can apply pressure to the web W, as shown in FIG. In addition, the web W can be deformed by the tension applying portion 110.

Assuming that the tension applying portion 110 applies a uniform pressure to the web W in the width direction, it is not possible to eliminate the distribution of the amount of elongation caused by passing through the pressurizing portion 82 as shown in FIG. Therefore, swelling occurs at the end of the web W (sheet S) having a large amount of elongation. Further, if the web W comes into contact with the tension applying portion 110 after the structure of the web W is fixed, the tension applying portion 110 cannot eliminate the distribution of the elongation amount, and the web W having a large elongation amount ( Waviness occurs at the edge of the sheet S).

Further, the tension applying unit 110 can relax 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. Therefore, the tension applying unit 110 can improve the stability of the transportation of the web W and suppress the occurrence of wrinkles on the web W.

In the sheet manufacturing apparatus 100, the tension applying portion 110 is a tension roller 112 in contact with the web W and a swingable support 114 that rotatably supports the tension roller 112, and the tension roller 112 is swung by swinging. It has a support 114 that translates the rotation axis Q, and 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 pressurizing unit 82 has a calendar roller 85 having an inverted crown shape. Therefore, in the sheet manufacturing apparatus 100, it is possible to prevent wrinkles from being generated at the end portion of the web W in the width direction by passing through the pressurizing portion 82. For example, if the shape of the calendar roller 85 is cylindrical, the web W may fold at the end in the width direction of the web W, and wrinkles may occur. Further, in the sheet manufacturing apparatus 100, even if the shape of the calendar roller 85 is an inverted crown shape, the difference in the amount of elongation of the web W in the width direction can be reduced by the tension applying portion 110.

Although the example in which the tension applying unit 110 is configured to include the tension roller 112 has been described above, the tension applying unit 110 may be configured to include a press device.

Further, in the sheet manufacturing apparatus according to the present invention, the defibrated product that has passed through the defibration section 20 may be transferred to the classification section (not shown) via the tube 3. Then, the classified product classified in the classification unit may be conveyed to the sorting unit 40. The classification section classifies the defibrated product that has passed through the defibration section 20. Specifically, the classification part separates and removes relatively small or low-density defibrated products (resin particles, coloring agents, additives, etc.). This makes it possible to increase the proportion of fibers that are relatively large or dense in the defibrated product. As the classification section, for example, a cyclone, an elbow jet, an eddy classifier, or the like is used.

2. 2. Modification Example of Sheet Manufacturing Device Next, the sheet manufacturing device according to the modification of the present embodiment will be described with reference to the drawings. FIG. 11 is a diagram schematically showing a sheet manufacturing apparatus 200 according to a modified example of the present embodiment. FIG. 11 shows the vicinity of the tension applying portion 110 of the sheet manufacturing apparatus 200.

Hereinafter, in the sheet manufacturing apparatus 200 according to the modified example of the present embodiment, the same reference numerals are given to the members having the same functions as the constituent members of the sheet manufacturing apparatus 100 according to the present embodiment, and detailed description thereof will be omitted. To do.

In the sheet manufacturing apparatus 100 described above, as shown in FIG. 2, the tension applying section 110 is arranged between the pressurizing section 82 and the heating section 84. On the other hand, in the sheet manufacturing apparatus 200, as shown in FIG. 11, the tension applying unit 110 is arranged on the downstream side of the heating unit 84. Specifically, the sheet manufacturing apparatus 200 includes a transport unit 120 that conveys the web W (sheet S) heated by the heating unit 84, and the tension applying unit 110 is located between the heating unit 84 and the transport unit 120. Have been placed. That is, the web W passes through the heating unit 84, comes into contact with the tension applying unit 110, and then passes through the transport 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 softened (because it is not solidified), the web W (sheet S) can be deformed (stretched) in the path direction, and the sheet S with less waviness can be formed. Can be molded. In this modification, the path length of the web W is, for example, the length of the path through which the web W is transported from the heating unit 84 to the transport unit 120.

The transport unit 120 is composed of a pair of transport rollers 122. The transport unit 120 is provided, for example, on the upstream side of the cutting unit 90. Specifically, the transport unit 120 is arranged between the heating unit 84 and the cutting unit 90. The shape of the transport roller 122 is, for example, a columnar 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, for example, the following features.

In the sheet manufacturing apparatus 200, the tension applying unit 110 is arranged between the heating unit 84 and the transport unit 120. Therefore, the tension applying unit 110 comes into contact with 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, similarly to the sheet manufacturing apparatus 100, the web W can be deformed by the tension applying portion 110 so that the amount of elongation of the web W is the same in the width direction.

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

In the sheet manufacturing apparatus according to the present invention, even if the tension applying unit 110 is arranged between the pressurizing unit 82 and the heating unit 84 and is arranged 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-shaped sheet. However, it is not limited to the sheet shape, and may be a board shape or a web shape. The sheets in the present specification are divided into paper and non-woven fabric. The paper includes a form formed into a thin sheet from pulp or used paper as a raw material, 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 less strong than paper, and are general non-woven fabrics, fiber boards, tissue paper (cleaning tissue paper), kitchen paper, cleaners, filters, liquid (waste ink and oil) absorbents, sound absorbing materials, etc. Includes insulation, cushioning, mats, etc. The raw material may be a plant fiber such as cellulose, a chemical fiber such as PET (polyethylene terephthalate) or polyester, or an animal fiber such as wool or silk.

In the present invention, some configurations may be omitted, or each embodiment or modification may be combined within the range having the features and effects described in the present application. The manufacturing unit 102 may omit some configurations, add other configurations, or replace with known configurations as long as the sheet can be manufactured.

The present invention includes a configuration substantially the same as the configuration described in the embodiment (for example, a configuration having the same function, method and result, or a configuration having the same purpose and effect). The present invention also 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 effects as the configuration described in the embodiment or a configuration that can achieve the same object. The present invention also includes a configuration in which a known technique is added to the configuration described in the embodiment.

1 ... Hopper, 2,3,7,8 ... Tube, 9 ... Hopper, 10 ... Supply part, 12 ... Coarse crushing part, 14 ... Coarse crushing blade, 20 ... Defibering part, 22 ... Introduction port, 24 ... Discharge port , 40 ... Sorting section, 41 ... Drum section, 42 ... Introduction port, 43 ... Housing section, 44 ... Discharge port, 45 ... First web forming section, 46 ... Mesh belt, 47, 47a ... Stretching roller, 48 ... Suction Part, 49 ... Rotating body, 49a ... Base, 49b ... Protrusion, 50 ... Mixing part, 52 ... Additive supply part, 54 ... Tube, 56 ... Blower, 60 ... Accumulation part, 61 ... Drum part, 62 ... Introduction port , 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 section, 85 ... Calendar roller, 86 ... Heating roller, 90 ... Cutting section, 92 ... First cutting section, 94 ... Second cutting section, 96 ... Discharge section, 100 ... Sheet manufacturing equipment, 102 ... Manufacturing section, 104 ... Control unit, 110 ... Tension applying part, 112 ... Tension roller, 114 ... Support, 114a ... First side wall part, 114b ... Second side wall part, 114c ... Bottom, 116 ... Fixed part, 120 ... Conveying part, 122 ... Conveying Roller, 200 ... Sheet manufacturing equipment, K1 ... 1st path length, K2 ... 2nd path length, K3 ... 3rd path length, L ... Virtual straight line, Q ... Rotation axis, R ... Direction, S ... Sheet, V, W … Web, α, β… direction, ΔEc, ΔEe… elongation

Claims (4)

A defibration section that defibrates raw materials containing fibers in the air,
A mixing section in which the defibrated product defibrated by the defibrating section and the resin are mixed in the air,
A depositing part for depositing the mixture mixed by the mixing part,
A pressurizing part that pressurizes the sediment deposited by the depositing part,
A heating unit that heats the deposits pressurized by the pressure unit,
A tensioning portion, which is arranged between the pressurizing portion and the heating portion and deforms the deposit so that the path length of the deposit is the same in the width direction of the deposit.
Equipped with a,
The pressurizing unit is composed of a pair of calendar rollers.
The heating unit is composed of a pair of heating rollers.
The tension applying portion is
A tension roller in contact with the deposit and
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 rotation axis of the tension roller is parallel to the width direction.
The tension applying portion is a sheet manufacturing apparatus characterized in that a force is applied to the deposit by the weight of the tension roller . A transport unit for transporting the deposits heated by the heating unit is provided.
The sheet manufacturing apparatus according to claim 1, wherein the tension applying portion is further arranged between the heating portion and the transport portion. The shape of the calender rollers is reversed crown shape, the sheet manufacturing apparatus according to claim 1 or 2, characterized in that. The shape of the heating roller is an inverted crown shape, claims 1, characterized in that
The sheet manufacturing apparatus according to any one of 3 .

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