JP2020122254A - Sheet production apparatus - Google Patents

Abstract

To provide a sheet production apparatus which has a reduced footprint (installation area) and improved installation performance.SOLUTION: A sheet production apparatus 100 comprises a coarsely pulverizing part 12, a loosening part 20, a second web forming part 70, and a molding part 106. The coarsely pulverizing part 12 coarsely pulverizes a raw material containing fibers into coarse fragments. The loosening part 20 defibrates the coarse fragments into defibrated products. The second web forming part 70 forms a web W by accumulating the defibrated products. The molding part 106 molds a sheet S from the web W. The coarsely pulverizing part 12 is located vertically below the molding part 106.SELECTED DRAWING: Figure 2

Description

The present invention relates to a sheet manufacturing apparatus.

BACKGROUND ART Heretofore, there has been disclosed a dry papermaking technique using waste paper as a raw material (see Patent Document 1). The used paper recycling apparatus described in FIG. 1 of Patent Document 1 includes a turbo cutter (fiber crusher) and a turbo mill for dry disaggregation, adjustment, and mixing, a cyclone for removing foreign matters, and a screen for removing undissolved fibers and the like. The sheet forming device for forming a sheet, the pickup device, the smooth press, the dryer unit, and the pop reel are arranged in one line.

JP-A-50-69306

However, since the used paper recycling apparatus described in Patent Document 1 has a single-row configuration in which all the processing units are arranged in a single row, it becomes long laterally, which is good if it is installed in a factory or the like. There is a problem that it is too large when it is placed in a room or installed in an empty space of a warehouse.

One of objects of some aspects of the present invention is to provide a sheet manufacturing apparatus having a small footprint (installation area) and improving installability.

The present invention has been made to solve at least a part of the problems described above, 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 crushing section for crushing the raw material containing fibers into crushed pieces,
A defibration unit for defibrating coarsely crushed pieces into defibrated materials,
A web forming unit that deposits defibrated material to form a web,
A forming unit for forming a sheet from the web,
The coarsely crushed portion is positioned vertically below the molding portion.

In such a sheet manufacturing apparatus, by disposing the coarsely crushing portion in the space below the molding portion, it is possible to reduce wasteful space as much as possible and to reduce the installation area.

In the sheet manufacturing apparatus according to the present invention,
The forming unit has a cutting unit that cuts an end in the sheet conveyance direction,
At least a part of the crushed portion may be located vertically below the cutting portion.

In such a sheet manufacturing apparatus, the end material generated at the cutting portion can be introduced into the crushing portion by gravity and reused.

In the sheet manufacturing apparatus according to the present invention,
The molding part is
A pressing unit for pressing the web,
A heating unit for heating the web pressed by the pressing unit,
A cutting unit for cutting the web heated by the heating unit,
The crushing section may be located vertically below the heating section and the cutting section.

In such a sheet manufacturing apparatus, the pressing unit can be easily maintained while the crushing unit is arranged vertically below the molding unit.

In the sheet manufacturing apparatus according to the present invention,
There is a receiving portion vertically below the pressurizing portion, the heating portion, and the cutting portion,
The receiving part may guide the paper dust generated in the forming part to the defibrating part side.

In such a sheet manufacturing apparatus, paper dust generated in the molding section can be reused.

In the sheet manufacturing apparatus according to the present invention,
A supply unit for loading raw materials and supplying the raw material to the crushing unit,
A discharge unit for stacking the sheets formed by the forming unit,
The supply unit is located on a first side wall of a casing of the sheet manufacturing apparatus,
The discharge unit may be located on a second side wall that is continuous with the first side wall of the housing of the sheet manufacturing apparatus.

Such a sheet manufacturing apparatus is convenient for users.

The figure which shows the sheet manufacturing apparatus which concerns on this embodiment typically. The top view which shows typically the sheet manufacturing apparatus which concerns on this embodiment. The rear view which shows typically the sheet manufacturing apparatus which concerns on this embodiment. The front view which shows typically the sheet manufacturing apparatus which concerns on this embodiment. The right side view which shows typically the sheet manufacturing apparatus which concerns on 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 unduly limit the content of the invention described in the claims. Further, not all of the configurations described below are essential configuration requirements of the invention.

The sheet manufacturing apparatus according to the present embodiment forms a web by crushing a raw material containing fibers into crushed pieces, a defibrating section that defibrates the crushed pieces into defibrated materials, and depositing defibrated materials. A web forming part and a forming part for forming a sheet from the web, and the crushing part is located vertically below the forming part.

1. Sheet manufacturing apparatus 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 this embodiment.

As shown in FIG. 1, the sheet manufacturing apparatus 100 includes a supply unit 10, a manufacturing unit 102, and a control unit 140. The manufacturing unit 102 manufactures a sheet. The manufacturing unit 102 includes a crushing unit 12, a defibrating unit 20, a classifying unit 30, a sorting unit 40, a first web forming unit 45, 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 the raw material to the crushing unit 12. The supply unit 10 is, for example, an automatic charging unit for continuously charging the raw material into the crushing unit 12. The raw material supplied by the supply unit 10 includes fibers such as waste paper and pulp sheet.

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

The defibrating unit 20 defibrates the raw material cut by the crushing unit 12. Here, "to disentangle" means to disentangle and unravel the raw material (object to be disentangled) 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 anti-bleeding agent attached to the raw material from the fibers.

What has passed through the defibrating unit 20 is referred to as a “defibrated material”. "Disentangled material" includes, in addition to disentangled disentangled fibers, resin (resin for binding a plurality of fibers) particles separated from the fibers when disentangled, ink, toner, etc. In some cases, the colorant, the anti-bleeding material, and the additive such as the paper strength enhancer are included. The shape of the disentangled defibrated material is a string shape or a flat string shape. The disentangled defibrated material may exist in a state not entangled with other disentangled fibers (independent state), or entangled with other disentangled defibrated material to form a lump. It may exist in a state (a state in which a so-called “damage” is formed).

The defibration unit 20 performs defibration in the air (in air) by a dry method. Specifically, an impeller mill is used as the defibrating unit 20. The defibrating unit 20 has a function of sucking the raw material and generating an air flow for discharging the defibrated material. As a result, the defibrating unit 20 can suck the raw material together with the airflow from the inlet 22 by the airflow generated by the defibrating unit 20, perform a defibration process, and convey the defibrated material to the discharge port 24. The defibrated material that has passed through the defibration unit 20 is transferred to the classification unit 30 via the tube 3.

The classifying unit 30 classifies the defibrated material that has passed through the defibrating unit 20. Specifically, the classifying unit 30 separates and removes relatively small defibrated materials and those having a low density (resin particles, coloring agents, additives, etc.). This can increase the proportion of fibers that are relatively large or have a high density in the defibrated material.

An airflow classifier is used as the classifying unit 30. An airflow classifier generates a swirling airflow and separates it by the difference in centrifugal force that is received due to the size and density of the objects to be classified, and the classification point can be adjusted by adjusting the speed and centrifugal force of the airflow. it can. Specifically, a cyclone, an elbow jet, an eddy classifier, or the like is used as the classifying unit 30. In particular, the cyclone shown in the drawing has a simple structure, and thus can be suitably used as the classifying unit 30.

The classification unit 30 includes, for example, an introduction port 31, a cylindrical portion 32 to which the introduction port 31 is connected, an inverted conical portion 33 located below the cylindrical portion 32 and continuous with the cylindrical portion 32, and an inverted conical portion 33. Has a lower discharge port 34 provided at the center of the lower part of the above, and an upper discharge port 35 provided at the center of the upper part of the cylindrical portion 32.

In the classifying unit 30, the air flow on which the defibrated material introduced from the introduction port 31 is placed changes into a circumferential motion in the cylindrical unit 32. As a result, the introduced defibrated material is subjected to centrifugal force, and the classifying unit 30 causes the defibrated material to have a higher density (first classified material) than the resin particles or the ink particles in the defibrated material. Among them, resin particles smaller than fibers and having a low density can be separated into resin particles, coloring agents, additives and the like (second classified material). The first classified product is discharged from the lower discharge port 34 and introduced into the sorting unit 40 via the pipe 4. On the other hand, the second classified matter is discharged from the upper discharge port 35 to the dust collecting section 36 through the pipe 5.

The sorting unit 40 introduces the first classified material (the defibrated material defibrated by the defibrating unit 20) that has passed through the classifying unit 30 from the introduction port 42, and selects according to the length of the fiber. As the sorting unit 40, for example, a sieve is used. The sorting unit 40 has a net (filter, screen), and is included in the first classified product and has fibers or particles smaller than the mesh opening size (those that pass through the net, the first sorted product) and the net. Fibers larger than the size of the mesh, undisentangled pieces, and lumps (those that do not pass through the net, the second sorted product) can be separated. For example, the first sorted product is received by the hopper 6 and then transferred to the mixing unit 50 via the pipe 7. The second sorted material is returned from the discharge port 44 to the defibrating unit 20 via the pipe 8. Specifically, the selection unit 40 is a cylindrical sieve that can be rotated by a motor. As the net of the selection unit 40, for example, a wire net, an expanded metal obtained by extending a notched metal plate, or a punching metal having a hole formed in the metal plate by a press machine or the like is used.

The first web forming unit 45 conveys the first sorted material 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 material dispersed in the air through the openings (mesh openings) of the sorting unit 40 onto the mesh belt 46. The first sorted material 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 those of 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 passes through the sorting unit 40 and the first web forming unit 45, and is formed into a soft and bulged state containing a large amount of air. The web V deposited on the mesh belt 46 is put into the tube 7 and conveyed to the mixing section 50.

The mixing unit 50 mixes the first sorted product that has passed through the sorting unit 40 (the first sorted product transported by the first web forming unit 45) and the additive containing resin. The mixing unit 50 includes an additive supply unit 52 that supplies an 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 section 50, an air flow is generated by the blower 56, and the first sorted product and the additive can be transported while being mixed in the pipe 54. The mechanism for mixing the first selection product and the additive is not particularly limited, and may be a stirring device using a high-speed rotating blade, or a device that uses the rotation of a container like a V-type mixer. It 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. When the resin is supplied, the plurality of fibers are not bound. The resin melts when passing through the sheet forming unit 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, Examples thereof include polyphenylene ether, polybutylene terephthalate, nylon, polyamide, polycarbonate, polyacetal, polyphenylene sulfide, and polyether ether ketone. You may use these resins individually or in mixture as appropriate. The additive supplied from the additive supply unit 52 may be in the form of fiber or powder.

In addition to the resin that binds the fibers, the additives supplied from the additive supply unit 52 may be a colorant for coloring the fibers or prevent aggregation of the fibers depending on the type of sheet to be manufactured. In order to prevent the fibers from burning, a flame retardant for preventing the fibers from burning easily may be contained. The mixture (mixture of the first selected product and the additive) that has passed through the mixing unit 50 is transferred to the deposition unit 60 via the pipe 54.

The deposition 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 disperses the defibrated material (fibers) in the air. Further, 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.

As the deposition unit 60, a rotating cylindrical sieve is used. The deposition unit 60 has a net and causes fibers or particles (those that pass through the net) contained in the mixture that has passed through the mixing unit 50 to be smaller than the size of the mesh opening. The configuration of the deposition unit 60 is the same as the configuration of the selection unit 40, for example.

The “sieve” of the deposition unit 60 does not have to have a function of selecting a specific object. That is, the “sifter” used as the deposition unit 60 means that it has a net, and the deposition unit 60 may drop all the mixture introduced into the deposition unit 60.

The second web forming unit 70 forms the web W by accumulating the passing matter that has passed through the accumulating unit 60. 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 deposits the passing matter that has passed through the openings (mesh openings) of the deposition unit 60. The mesh belt 72 is stretched by a stretching roller 74, and is configured so that it is difficult for a passing object to pass therethrough and allows air to pass. The mesh belt 72 moves as the stretching roller 74 rotates. The web W is formed on the mesh belt 72 by continuously depositing the passing objects that have passed through the deposition unit 60 while the mesh belt 72 continuously moves. 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 deposition unit 60 side). The suction mechanism 76 can generate an airflow directed downward (airflow directed from the deposition unit 60 to the mesh belt 72). The suction mechanism 76 can suck the mixture dispersed in the air by the deposition unit 60 onto the mesh belt 72. As a result, the discharge speed from the deposition unit 60 can be increased. Further, the suction mechanism 76 can form a downflow in the dropping path of the mixture, and can prevent the defibrated material and the additives from being entangled with each other during the fall.

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

In the illustrated example, a humidity control section 78 that controls the humidity of the web W is provided. The humidity control section 78 can add water or water vapor to the web W to adjust the amount ratio of the web W and water.

The sheet forming unit 80 pressurizes and heats the web W accumulated on the mesh belt 72 to form the sheet S. In the sheet forming unit 80, by applying heat to 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). You can

As the sheet forming unit 80, for example, a heating roller (heater roller), a hot press molding machine, a hot plate, a warm air blower, an infrared heater, or a flash fixing device is used. In the illustrated example, the sheet forming portion 80 includes a first binding portion 82 and a second binding portion 84, and the binding portions 82 and 84 each include a pair of heating rollers 86. By configuring the binding portions 82 and 84 as the heating roller 86, the web W can be continuously conveyed as compared with the case where the binding portions 82 and 84 are configured as a plate-shaped pressing device (flat plate pressing device). The sheet S can be molded. The number of 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 intersecting 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.

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

1.2. Arrangement The arrangement of the processing units in the sheet manufacturing apparatus 100 will be described with reference to FIG. 2 to 5 are diagrams schematically showing the sheet manufacturing apparatus 100 according to the present embodiment, FIG. 2 is a plan view, FIG. 3 is a rear view, FIG. 4 is a front view, and FIG. 5 is a right side view. .. 2 to 4, in order to describe the internal structure, the side wall on the front side of the drawing is omitted and the configuration of the processing unit on the back side is omitted. The processing units of the sheet manufacturing apparatus 100 shown in FIGS. 2 to 5 have already been described in the above “1.1. Configuration”, and thus redundant description will be omitted.

In FIG. 2, the side on which the operation unit 141 (control unit 140) for the user to operate the sheet manufacturing apparatus 100 is arranged is the front side of the sheet manufacturing apparatus 100. When the side where the operation unit 141 is located is the front side, the defibrating unit 20 is located on the rear side and the molding unit 106 is located on the front side.

As shown in FIG. 2, in the sheet manufacturing apparatus 100, the outer shape of the housing 150 excluding the supply unit 10 and the discharge unit 96 in a plan view is rectangular, and the four first to fourth side walls 150a to 150d are provided on the four sides. Have. The first to fourth side walls 150a to 150d rise upward from the machine base 150e. The first side wall 150a on the front side is arranged in front of the sheet manufacturing apparatus 100 and faces the third side wall 150c on the rear side. The second side wall 150b and the fourth side wall 150d are arranged so as to connect both ends of the first side wall 150a and both ends of the third side wall 150c.

The supply unit 10 and the discharge unit 96 are located outside the housing 150 and are arranged adjacent to the first side wall 150a and the second side wall 150b, respectively. In the present embodiment, the first and third side walls 150a and 150c are longer than the second and fourth side walls 150b and 150d, and the housing 150 is rectangular in plan view. The first to fourth side walls 150a to 150d are substantially rectangular plate-shaped bodies having the same height, and therefore the housing 150 is a substantially rectangular parallelepiped.

The supply unit 10 loads the raw materials and supplies the raw materials to the crushing unit 12. The supply unit 10 is located on the first side wall 150a of the housing 150 of the sheet manufacturing apparatus 100. The supply unit 10 is arranged adjacent to the outer surface of the first side wall 150a and near the second side wall 150b. The discharge unit 96 stacks the single-cut sheets S1 formed by the forming unit 106. The discharge unit 96 is located on the second side wall 150b that is continuous with the first side wall 150a of the housing 150 of the sheet manufacturing apparatus 100. The discharge part 96 is arranged adjacent to the outer surface of the second side wall 150b and near the first side wall 150a. By arranging the supply unit 10 and the discharge unit 96 on the continuous side wall in this way, the convenience for the user is good.

The sheet manufacturing apparatus 100 includes at least a crushing unit 12 that crushes a raw material containing fibers into crushed pieces, a defibrating unit 20 that defibrates the crushed pieces obtained in the crushing unit 12 into defibrated materials, and defibration. A second web forming unit 70 that deposits the defibrated material obtained in the fiber unit 20 to form a web W, and a forming unit 106 that forms the cut sheet S1 from the web W obtained in the second web forming unit 70. With.

The forming unit 106 is heated by the heating unit 83, and a sheet forming unit 80 including a pressing unit 81 that presses the web W and a heating unit 83 that heats the web W pressed by the pressing unit 81. The cutting unit 90 for cutting the continuous sheet S is included.

The sheet manufacturing apparatus 100 has two transport lines A and B for transporting raw materials or sheets S at the front and rear. The front side conveyance line B extends from the fourth side wall 150d to the second side wall 150b on the side of the first side wall 150a, the deposition unit 60, the second web forming unit 70, the sheet forming unit 80 (pressurizing unit 81, heating unit 83), The cutting portions 90 are arranged in this order. Then, the discharge section 96 is connected to the downstream end of the front transport line B.

In the rear side conveyance line A, the defibrating unit 20, the classifying unit 30, the selecting unit 40, and the mixing unit 50 are arranged in this order from the second side wall 150b to the fourth side wall 150d on the side of the third side wall 150c. In this way, by arranging two rows in the front and rear, the length of the entire apparatus can be made shorter than that in the one-row configuration. Therefore, the size of the sheet manufacturing apparatus 100 can be set in an office or a warehouse.

As shown in FIGS. 2, 4, and 5, the crushing unit 12 is located vertically below the molding unit 106. By disposing the coarsely crushing section 12 in the space below the molding section 106, it is possible to reduce wasteful space as much as possible and to reduce the installation area of the sheet manufacturing apparatus 100. The raw material supplied from the supply unit 10 is supplied to the defibration unit 20 of the rear side conveyance line A via the crushing unit 12 which is vertically below the molding unit 106.

The order of processing of each processing unit is as described in the above “1.1. Configuration”, and in FIG. 2, it is indicated by solid line arrows (pipes and the like are omitted) connecting the processing units. Each processing unit will be described in the order of these arrows. The raw material is supplied from the supply unit 10 into the housing 150, becomes a coarsely crushed piece in the coarsely crushing unit 12 below the molding unit 106 in the vertical direction, and is sent to the rear transport line A. The coarsely crushed pieces are conveyed to the defibrating unit 20 on the side of the second side wall 150b and defibrated by the defibrating unit 20 to become a defibrated material, and the defibrated material is classified by a classification unit 30 near the center of the housing 150. Becomes a first classified product, and the first classified product is sorted by a sorting unit 40 to become a first sorted product, and the first sorted product is mixed with an additive containing a resin in a mixing unit 50 to become a mixture, and the mixture is conveyed to the front side. Sent to line B. Then, in the front side conveyance line B, the mixture is conveyed to and unraveled to the deposition unit 60 on the fourth sidewall 150d side, and is deposited on the second web forming unit 70 below the deposition unit 60 in the vertical direction to form the web W, The web W is conveyed to the sheet forming unit 80 and formed into the continuous sheet S, the continuous sheet S is conveyed to the cutting unit 90 on the second side wall 150b side and cut into the single-cut sheets S1, and the single-cut sheets S1 are discharged. It is discharged to the discharge portion 96 outside the housing 150 through the opening 154.

In the present embodiment, an example in which there are two lines of transfer lines has been described, but the present invention is not limited to this, and three or more lines of transfer lines may be used, or a transfer line that extends in the front-rear direction may be used.

1.3. Cutting Unit The cutting unit 90 will be described in detail with reference to FIGS. 4 and 5.

The molding section 106 has a cutting section 90 on the side of the second sidewall 150b in the housing 150, and the cutting section 90 has a first cutting section 92 and a second cutting section 94.

The first cutting unit 92 cuts the continuous sheet S conveyed from the sheet forming unit 80 in a direction orthogonal to the conveyance direction M of the continuous sheet S. The first cutting section 92 has a blade section having a blade formed at the lower end for cutting the continuous sheet S, and a cutting drive section for moving the blade section up and down with respect to the continuous sheet S. In response to a command from the control unit 140, the cutting drive unit lowers the blade portion with respect to the continuous sheet S at predetermined intervals to cut into a predetermined cut sheet S1 length, and raises the blade portion after cutting. The length of the cut sheet S1 is equal to the length of the cut sheet S1 which is the final product.

In the present specification, “sheet width” is the length of the sheets S and S1 in the direction orthogonal to the transport direction M, and “sheet length” is the sheet S and S1 in the direction parallel to the transport direction M. Is the length of.

The blade portion has a blade extending over the entire width of the continuous sheet S in a direction orthogonal to the transport direction M. The first cutting portion 92 is shown as an example of a so-called guillotine cutter system, but a known paper cutting mechanism such as a rotary cutter system in which a disc-shaped blade is rotated and used can be adopted.

The second cutting section 94 is located downstream of the first cutting section 92 in the transport direction M. The second cutting section 94 further cuts the cut sheet S1 cut by the first cutting section 92 in the direction along the transport direction M. That is, the second cutting unit 94 cuts the end portion of the cut sheet S1 in the transport direction. When the first cutting portion 92 is not provided (the product is not a single-cut sheet but a continuous sheet wound in a roll), the end of the continuous sheet S in the transport direction may be cut. The second cutting portion 94 is sometimes called a slitter, and cuts off both end portions in the width direction of the single-cut sheet S1 to align the width of the single-cut sheet S1 as a product.

As shown in FIG. 5, the second cutting section 94 arranges cutting blades at two positions near both ends in the width direction of the cut sheet S1 to cut both ends in the width direction. The second cutting portion 94 has a first side end cutting portion 94a and a second side end cutting portion 94b.

The cutting blades of the first side end cutting portion 94a and the second side end cutting portion 94b are disk-shaped rotary blades as shown in FIG. 4, and the two cutting blades are cut sheet S1 as shown in FIG. Are fixed to the same rotating shaft so that they always have a constant width and rotate. The first side end cutting portion 94a and the second side end cutting portion 94b continuously cut the single-cut sheet S1 conveyed in the conveying direction M. Although the rotary blade was used as the cutting blade of the second cutting portion 94, the present invention is not limited to this, and a known cutter used for a slitter can be used.

The end of the single-cut sheet S1 in the transport direction is a portion that becomes unnecessary when processing the continuous sheet S into a single-cut sheet S1 that is a product, and the first side end is cut from both ends in the width direction of the continuous sheet S. It is a portion between the portion 94a and the second side end cutting portion 94b. The side edges are cut off because the shapes of both ends of the cut sheet S1 are adjusted, and the basis weight of the side edges tends to be smaller than the basis weight required for the product. is there. Since the side end portion does not have a problem with the fibers themselves of the defibrated material, the end material S2 (FIG. 5) obtained by being cut off is returned to the defibration portion 20 again and undergoes a series of steps. It can be sufficiently reused as a raw material for the continuous sheet S.

In order to efficiently reuse the mill ends S2, at least a part of the crushing unit 12 is located vertically below the cutting unit 90. By providing the crushing section 12 vertically below the cutting section 90, the end material S2 generated in the cutting section 90 can be introduced into the crushing section 12 by gravity. More specifically, the coarsely crushing section 12 has a guide 13 which is vertically below the second cutting section 94 and which is constituted by a frame of a plate body that spreads upward. The guide 13 slides the falling offcut S2 and guides it to the coarse crushing blade 14. The guide 13 has an opening on the supply opening 152 side of the supply section 10 for receiving the raw material supplied from the supply section 10 to the crushing section 12.

The crushing section 12 is located vertically below the heating section 83 and the cutting section 90. With such an arrangement of the crushing section 12, it is possible to easily perform maintenance of the pressing section 81 while arranging the crushing section 12 vertically below the molding section 106. The pressurizing unit 81 has a larger and heavier pressurizing mechanism than the heating unit 83 and the cutting unit 90. Therefore, by disposing the pressurizing mechanism on the lower side of the web W, the pressurizing mechanism is provided, for example, in the housing 150. It is easy to pull it out and maintenance can be done easily.

The coarsely crushed pieces of the mill ends S2 crushed by the crushing section 12 freely fall downward from the crushing section 12 together with the crushed pieces of the raw material supplied from the supply section 10, and are received by the hopper 1 into the pipe 2. It is collected and conveyed in the pipe 2 to the defibrating unit 20 by air flow. Since the scrap S2 is not sufficiently pressed by the pressurizing unit 81 due to insufficient basis weight, it can be defibrated by the defibrating unit 20 without being crushed, but it is a crushed piece like the raw material. The defibrating unit 20 can defibrate more reliably. Further, since the mill ends S2 are coarsely crushed pieces, they can be easily transported by the airflow generated in the defibrating unit 20.

The crushing unit 12 is for shredding the raw material supplied from the supply unit 10, and it is necessary to separately provide a shredder for the scrap S2 by sharing this with the shred of the scrap S2. Therefore, low cost, space saving, and energy saving can be achieved.

1.4. Receiving part The receiving part is provided vertically below the pressurizing part 81, the heating part 83 and the cutting part 90. In the example shown in FIG. 4 and FIG. 5, the hopper 1 is extended and formed as a receiving part. The hopper 1 (reception part) guides the paper dust generated in the molding part 106 to the defibration part 20 side.

The web W deposited by the second web forming unit 70 has insufficient grammage at both end portions and cannot maintain its form as the web W even when pressed by the pressurizing unit 81, and becomes a paper dust. With defibrated material. Conventionally, a part of the paper dust is conveyed together with the web W, and a part of the paper dust is separated from the web W and stays in the middle of the conveying path to form a mass of paper dust. Then, if the lump of paper powder is left as it is, the lump is mixed with the web W at some time, and the continuous sheet S may be jammed, or a speckled pattern may be generated on the cut sheet S1 of the product.

As shown in FIGS. 4 and 5, in the pressing portion 81, the heating portion 83, and the cutting portion 90, the web W and the continuous sheet S have at least the same width as the cut sheet S1 that is a product under the web W and the continuous sheet S. It has a plate-shaped guide 87. The web W and the continuous sheet S are conveyed by a plurality of rollers such as a pressure roller 85 and a heating roller 86, and at that time, a portion having a width wider than that of the plate-shaped guide 87, that is, paper near both side end portions. The powder falls outside the plate-shaped guide 87.

Since the hopper 1 (reception part) has a width wider than that of the plate-shaped guide 87, the hopper 1 (reception part) can receive the dropped paper dust. The hopper 1 (reception part) extends on the downstream side of the second web forming part 70 where paper dust is generated, that is, vertically below the pressurizing part 81, the heating part 83, and the cutting part 90. The hopper 1 (reception part) is inclined downward toward the tube 2 and becomes a so-called shooter in which paper dust slides down. The paper powder is conveyed to the defibrating unit 20 through the tube 2.

By having such a hopper 1 (reception part), the paper dust generated in the molding part 106 can be reused. Further, by guiding the paper dust to the hopper 1 (receiving portion), it is possible to prevent jamming of the conveyance and spot patterns on the single-cut sheet S1.

Since the paper dust can be easily defibrated by the defibration unit 20, in the present embodiment, the paper dust is directly conveyed from the hopper 1 (reception unit) to the defibration unit 20, but the present invention is not limited to this, and the paper dust may be roughened. A receiving portion may be provided so as to lead to the crushing portion 12. In that case, the paper dust is guided to the crushing unit 12 by the receiving unit, crushed into the hopper 1, and then conveyed to the defibrating unit 20.

The paper in the present specification includes an embodiment in which a thin sheet is formed from pulp or waste 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. The non-woven fabric in this specification is thicker than paper or low in strength, and is a general non-woven fabric, fiber board, tissue paper (cleaning tissue paper), kitchen paper, cleaner, filter, liquid (waste ink or oil) absorbent material. , Sound absorbing material, heat insulating material, cushioning material, mat and the like. The raw material may be plant fibers such as cellulose, PET (polyethylene terephthalate), chemical fibers such as polyester, and animal fibers such as wool and silk.

The present invention may omit some of the configurations or combine the embodiments and modifications within the scope of the features and effects described in the present application.

The present invention includes a configuration substantially the same as the configuration described in the embodiment (a configuration having the same function, method and result, or a configuration having the same object and effect). Further, the invention includes configurations in which non-essential parts of the configurations described in the embodiments are replaced. In addition, the invention includes a configuration that achieves the same effects as the configurations described in the embodiments or a configuration that can achieve the same object. Further, the invention includes configurations in which known techniques are added to the configurations described in the embodiments.

1... Hopper, 2, 3, 4, 5... Pipe, 6... Hopper, 7, 8... Pipe, 9... Hopper, 10... Supply unit, 12... Coarse crushing unit, 13... Guide, 14... Coarse crushing blade, 20 ... defibrating unit, 22... inlet, 24... outlet, 30... classifying unit, 31... inlet, 32... cylindrical portion, 33... inverted cone portion, 34... lower outlet, 35... upper outlet, 36... Dust collecting part, 40... Sorting part, 42... Inlet port, 44... Outlet port, 45... First web forming part, 46... Mesh belt, 47... Stretching roller, 48... Suction part, 50... Mixing part, 52... Additive supply part, 54... Tube, 56... Blower, 60... Accumulation part, 62... Inlet port, 70... Second web forming part, 72... Mesh belt, 74... Tension roller, 76... Suction mechanism, 78... Adjustment Wet part, 80... Sheet forming part, 81... Pressing part, 82... First binding part, 83... Heating part, 84... Second binding part, 85... Pressure roller, 86... Heating roller, 87... Plate -Shaped guide, 90... Cutting part, 92... First cutting part, 94... Second cutting part, 94a... First side end cutting part, 94b... Second side end cutting part, 96... Discharging part, 100... Sheet manufacturing Apparatus, 102... Manufacturing section, 106... Molding section, 140... Control section, 141... Operation section, 150... Housing, 150a to 150d... First to fourth side walls, 150e... Machine stand, 152... Supply opening, 154... Discharge opening, A... Rearward transport line, B... Frontward transport line, M... Transport direction, S... Sheet, S1... Single-cut sheet, S2... Mill ends, V... Web, W... Web

Such a sheet manufacturing apparatus is convenient for users.
One aspect of the sheet manufacturing apparatus according to the present invention is
A supply section for supplying a raw material containing fibers to the crushing section,
A coarse crushing unit for coarsely crushing the raw material supplied from the supply unit into coarse crushed pieces,
A discharging unit configured to discharge the sheet formed by using the coarsely crushed pieces,
The direction in which the raw material is supplied from the supply unit to the coarse crushing unit and the direction in which the sheet is discharged to the discharging unit intersect in a plan view.
Further, in the sheet manufacturing apparatus according to the present invention,
A defibrating unit for defibrating the coarsely crushed pieces into a defibrated material,
In a plan view, the coarse crushing unit may be arranged between the supply unit and the defibrating unit.
Further, in the sheet manufacturing apparatus according to the present invention,
A casing containing the coarsely crushing unit and the defibrating unit,
The supply unit and the discharge unit are provided outside the housing,
An operation unit for operating the sheet manufacturing apparatus,
The operation unit may be provided on the side wall side of the housing in which the supply unit is arranged.
Further, in the sheet manufacturing apparatus according to the present invention,
The direction in which the raw material is supplied from the supply unit to the coarse crushing unit may be orthogonal to the direction in which the sheet is discharged to the discharging unit.

Claims (5)

A crushing section for crushing the raw material containing fibers into crushed pieces,
A defibration unit for defibrating coarsely crushed pieces into defibrated materials,
A web forming unit that deposits defibrated material to form a web,
A forming unit for forming a sheet from the web,
The sheet manufacturing apparatus, wherein the crushing section is located vertically below the molding section. The forming unit has a cutting unit that cuts an end in the sheet conveyance direction,
The sheet manufacturing apparatus according to claim 1, wherein at least a part of the coarsely crushed portion is located below the cutting portion in the vertical direction. The molding part is
A pressing unit for pressing the web,
A heating unit for heating the web pressed by the pressing unit,
A cutting unit for cutting the sheet heated by the heating unit,
The sheet manufacturing apparatus according to claim 1, wherein the crushing unit is located vertically below the heating unit and the cutting unit. There is a receiving portion vertically below the pressurizing portion, the heating portion, and the cutting portion,
The sheet manufacturing apparatus according to claim 3, wherein the receiving portion guides the paper dust generated in the forming portion to the defibrating portion side. A supply unit for loading raw materials and supplying the raw material to the crushing unit,
A discharge unit for stacking the sheets formed by the forming unit,
The supply unit is located on a first side wall of a casing of the sheet manufacturing apparatus,
The sheet manufacturing apparatus according to claim 1, wherein the discharging unit is located on a second side wall that is continuous with the first side wall of the housing of the sheet manufacturing apparatus.

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