JP2017008426A - Sheet production apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet production apparatus capable of producing a sheet having high uniformity of a basis weight.SOLUTION: A sheet production apparatus 100 according to the present invention comprises a rotatable drum part 40 having a plurality of openings 110 formed therein, a housing 120 provided so as to surround the drum part 40, and an accumulation surface 46a on which defibrated products passing through the openings 110 of the drum part 40 are accumulated. The housing part 120 includes an inner peripheral surface 120a along an outer peripheral surface 112a of the drum part 40, a first flat surface 140a continuous to one end side of the inner peripheral surface 120a, and a second flat surface 140b continuous to the other end side of the inner peripheral surface 120a. The first flat surface 140a and the second flat surface 140b face each other and are separated from each other by distance shorter than diameter of the drum part 40. The first flat surface 140a extends in a direction β being a tangential direction of the inner peripheral surface 120a along a rotation direction α of the drum part 40 and also extends in a direction along an air flow A2 conveying the defibrated products to the accumulation surface 46a.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, a piece of paper is defibrated in a dry defibrating machine, the fiber is deinked in a cyclone, and the deinked fiber is passed through an opening of a sieve and deposited on a mesh belt. The manufacture of a sheet is described.

JP2015-66932A

  However, in the sheet manufacturing apparatus as described above, for example, in the housing portion that surrounds the sieve (drum portion), the fiber (defibrated material) is easily charged with static electricity due to low humidity due to heat generated by the defibrating machine. It is easy for defibrated material to adhere to the inner surface. For this reason, for example, the defibrated material attached to the inner surface of the housing part may form lumps, and the dams may fall on the mesh belt, and the amount of defibrated material deposited on the mesh belt may change. . As a result, a sheet with high basis weight uniformity may not be manufactured.

  One of the objects according to some aspects of the present invention is to provide a sheet manufacturing apparatus capable of manufacturing a sheet having high uniformity of basis weight.

  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 into defibrated material;
A plurality of openings for allowing the defibrated material to pass therethrough, and a rotatable drum portion;
A housing portion provided so as to surround the drum portion;
A deposition surface on which the defibrated material that has passed through the opening of the drum portion is deposited;
Have
The housing portion includes an inner peripheral surface along the outer peripheral surface of the drum portion, a first plane continuous with one end side of the inner peripheral surface, a second plane continuous with the other end side of the inner peripheral surface, Have
The first plane and the second plane face each other and are separated by a distance shorter than the diameter of the drum portion,
The first plane extends in a direction tangential to the inner peripheral surface and in a direction along the rotation direction of the drum portion, and extends in a direction along an air flow that carries the defibrated material to the deposition surface.

  In such a sheet manufacturing apparatus, it is possible to suppress the defibrated material from adhering to the inner peripheral surface of the housing portion. As a result, in such a sheet manufacturing apparatus, a sheet with high basis weight uniformity can be manufactured.

One aspect of the sheet manufacturing apparatus according to the present invention is:
A defibrating unit for defibrating raw materials containing fibers into defibrated material;
A plurality of openings for allowing the defibrated material to pass therethrough, and a rotatable drum portion;
A housing portion provided so as to surround the drum portion;
A discharge pipe connected to the housing part for discharging the defibrated material;
Have
The inner peripheral surface of the housing portion facing the outer peripheral surface of the drum portion is smooth,
The discharge pipe has an inner surface extending in a direction tangential to the inner peripheral surface of the housing portion at a connection portion with the housing portion and along a rotation direction of the drum portion.

  In such a sheet manufacturing apparatus, it is possible to suppress the defibrated material from adhering to the inner peripheral surface of the housing portion. As a result, in such a sheet manufacturing apparatus, a sheet with high basis weight uniformity can be manufactured.

In the sheet manufacturing apparatus according to the present invention,
The inner peripheral surface of the housing part may be a curved surface.

  In such a sheet manufacturing apparatus, the inner peripheral surface of the housing portion can be made smooth.

In the sheet manufacturing apparatus according to the present invention,
The inner peripheral surface of the housing part may be provided along the outer peripheral surface of the drum part.

  In such a sheet manufacturing apparatus, a sheet with high basis weight uniformity can be manufactured.

In the sheet manufacturing apparatus according to the present invention,
Depositing the defibrated material discharged from the discharge pipe, and having a movable belt;
The discharge port of the discharge pipe may be provided so as to face the deposition surface of the belt.

  In such a sheet manufacturing apparatus, the region where the defibrated material is discharged by the discharge port can be reduced (squeezed), and the length of the mesh belt (the length of one round) can be reduced. As a result, such a sheet manufacturing apparatus can be downsized.

In the sheet manufacturing apparatus according to the present invention,
Connected to a discharge port of the discharge pipe, and has a transfer pipe for transferring the defibrated material discharged from the discharge pipe by an air flow;
The transport pipe may extend in a direction intersecting the tangential direction.

  In such a sheet manufacturing apparatus, fluctuations in the amount per unit time of the defibrated material conveyed by the conveying tube can be reduced.

In the sheet manufacturing apparatus according to the present invention,
The inner peripheral surface of the housing part may be provided close to the outer peripheral surface of the drum part.

  In such a sheet manufacturing apparatus, it is possible to increase the wind speed of the airflow generated in the flow path formed between the inner peripheral surface of the housing portion and the outer peripheral surface of the drum portion.

In the sheet manufacturing apparatus according to the present invention,
An air flow having a wind speed of 2 m / s or more may be generated in a flow path formed between the inner peripheral surface of the housing portion and the outer peripheral surface of the drum portion.

  In such a sheet manufacturing apparatus, even if the defibrated material adheres to the inner peripheral surface of the housing portion, the defibrated material is removed from the inner peripheral surface of the housing portion by an air flow before the defibrated material forms a dama. Can be released.

In the sheet manufacturing apparatus according to the present invention,
The inner peripheral surface of the housing part may be formed of a conductor or antistatic resin.

  In such a sheet manufacturing apparatus, the defibrated material can be prevented from adhering to the inner peripheral surface of the housing portion by being charged by friction.

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 sheet manufacturing apparatus which concerns on this embodiment. The perspective view which shows typically the sheet manufacturing apparatus which concerns on this embodiment. The perspective view which shows typically the sheet | seat manufacturing apparatus which concerns on the 1st modification of this embodiment. Sectional drawing which shows typically the sheet manufacturing apparatus which concerns on the 2nd modification of this embodiment. Sectional drawing which shows typically the sheet | seat manufacturing apparatus which concerns on the 3rd 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 into air 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 defibrates in a dry manner in the atmosphere (in the air). Specifically, an impeller mill is used as the defibrating unit 20. 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. As the selection unit 40, for example, a sieve is used. The sorting unit 40 has a net (filter, screen), fibers or particles smaller than the mesh size of the mesh (things that pass through the mesh, the first selection product), 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 sorting unit 40 is a cylindrical sieve that is rotationally driven by a motor. As the net of the sorting unit 40, 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 rotator 49 has a base 49a and a protrusion 49b protruding from the base 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.

  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 prevents coloring of the fibers and the aggregation of the fibers depending on the type of sheet to be produced. An anti-agglomeration material inhibitor for the purpose of the treatment may contain a flame retardant for making the fibers difficult to burn. 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.

  As the deposition unit 60, a rotating cylindrical sieve is used. The deposition unit 60 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 deposition unit 60 is the same as the configuration of the sorting unit 40, for example.

  It should be noted that the “sieving” of the depositing unit 60 may not have a function of selecting a specific object. That is, the “sieving” used as the depositing unit 60 means that the net is provided, and the depositing unit 60 may drop all of the mixture introduced into the depositing unit 60.

  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. 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. Sorting Unit The sorting unit 40 will be described in detail. FIG. 2 is a cross-sectional view schematically showing the selection unit 40. 3 and 4 are perspective views schematically showing the selection unit 40. In FIG. 3, each member is simplified.

  As shown in FIG. 4, the sorting unit 40 includes a net part (net) 112 in which a plurality of openings 110 for allowing the defibrated material to pass therethrough, and two disk parts 114 sandwiching the net part 112, 116. The net part 112 has a cylindrical shape. The sorting unit 40 is a drum (screen) in which the mesh unit 112 can rotate around the rotation axis Q. In the example illustrated in FIG. 2, the drum unit (sorting unit) 40 rotates in the α direction (counterclockwise). The outer peripheral surface 112a of the net portion 112 of the drum portion 40 is, for example, a circle centered on the position of the rotation axis Q in a cross section cut by a plane orthogonal to the rotation axis Q (a plane having the rotation axis Q as a perpendicular line). . The rotation speed of the drum unit 40 is, for example, 200 rpm or more and 300 rpm or less, and preferably 250 rpm. The radius r of the drum portion 40 is, for example, 150 mm or more and 300 mm or less, and preferably 210 mm. The rotation speed of the drum unit 40 may be controlled by the control unit 104 (see FIG. 1).

  As shown in FIG. 4, the disk portion 114 is provided with an introduction port 42 to which the tube 3 is connected. The disc part 116 is provided with a discharge port 44 to which the tube 8 is connected. In FIG. 1, the connection between the sorting unit 40 and the pipes 3 and 8 and the connection between the deposition unit 60 and the pipe 54 are simplified.

  As shown in FIGS. 2 and 3, the sheet manufacturing apparatus 100 includes a housing portion 120 and a discharge pipe (discharge portion, discharge path) 140.

  The housing part 120 is provided so as to be separated from the drum part 40 and to surround the drum part 40. The housing part 120 accommodates the drum part 40. The housing portion 120 has an inner peripheral surface 120 a that faces the outer peripheral surface 112 a of the drum portion 40. The inner peripheral surface 120a is smooth. Here, “the inner peripheral surface 120a is smooth” includes a case where the inner peripheral surface 120a is formed of a curved surface and a case where the inner peripheral surface 120a is formed of a curved surface and a flat surface. When the inner peripheral surface 120a is composed of a curved surface and a flat surface, the connecting portion (switching portion) between the curved surface and the flat surface is formed so as to have no corners. In the illustrated example, the inner peripheral surface 120a is cylindrical, and as shown in FIG. 2, in a cross section cut by a plane orthogonal to the rotation axis Q, a part of a circle centering on the position of the rotation axis Q ( Arc). The inner peripheral surface 120a is provided along the outer peripheral surface 112a, for example.

The housing part 120 and the drum part 40 form a first flow path 130. The first flow path 130 is formed between the inner peripheral surface 120 a of the housing part 120 and the outer peripheral surface 112 a of the drum part 40. In the first flow path 130, an air flow A <b> 1 is generated along the rotation direction α of the drum unit 40. The wind speed of airflow A1 is 2 m / s or more and 3 m / s or less, for example. The defibrated material that has passed through the opening 110 formed in the mesh portion 112 is transported to the second flow path 132 on the airflow A1.

  The inner peripheral surface 120 a of the housing part 120 is provided in the vicinity of the outer peripheral surface 112 a of the drum part 40. Here, “the inner peripheral surface 120a is provided close to the outer peripheral surface 112a” means that the distance D between the inner peripheral surface 120a and the outer peripheral surface 112a is 10 mm or more and 20 mm or less. If the distance D is smaller than 10 mm, the first flow path 130 may be clogged with the defibrated material. If the distance D is greater than 20 mm, the wind speed of the airflow A1 may not be 2 m / s or more.

The inner peripheral surface 120a of the housing part 120 is made of, for example, a conductor or antistatic resin. Examples of the conductor constituting the inner peripheral surface 120a include metals such as stainless steel. Examples of the antistatic resin constituting the inner peripheral surface 120a include an acrylic resin. The “antistatic resin” is a resin having a sheet resistance (surface resistivity) of 10 ⁶ Ω / □ or less.

  The discharge pipe 140 is connected to the housing part 120. The discharge pipe 140 may be formed integrally with the housing part 120. The volume of the discharge pipe 140 is smaller than the volume of the housing part 120.

  The discharge pipe 140 has a first inner surface 140a. The first inner surface 140 a of the discharge pipe 140 is connected to the inner peripheral surface 120 a of the housing part 120 at the connection part 142. The first inner surface 140a is, for example, a plane. The first inner surface 140a is connected so that there is no corner at the connecting portion 142. As shown in FIG. 2, for example, in a cross section cut by a plane orthogonal to the rotation axis Q, the first inner surface 140 a is a tangential direction of the inner peripheral surface 120 a at the connection portion 142 with the housing portion 120, and the drum portion 40 extends in the direction β along the rotational direction α. In the example illustrated in FIG. 2, the first inner surface 140 a extends vertically downward from the connection portion 142.

  For example, the discharge pipe 140 further includes a second inner surface 140b and a third inner surface 140c. The second inner surface 140b is a surface connected to the inner peripheral surface 120a of the housing part 120 and is a surface facing the first inner surface 140a. The third inner surface 140c is a surface that is continuous with the second inner surface 140b and is inclined with respect to the first inner surface 140a so that the width of the discharge pipe 140 increases in the direction β. The inner surfaces 140a, 140b, and 140c are formed of, for example, a conductor or antistatic resin, similarly to the inner peripheral surface 120a of the housing portion 120.

  The first inner surface 140a and the second inner surface 140b (and the third inner surface 140c) of the discharge pipe 140 are respectively continuous with one end of the inner peripheral surface 120a of the housing part 120 and the other end of the inner peripheral surface 120a. It can also be expressed as a surface to perform. The connecting portion 142 is expressed as a switching portion between the peripheral surface (inner peripheral surface 120a) and the flat surface (first inner surface 140a), or the peripheral surface (inner peripheral surface 120a) and the flat surface (first inner surface 140a) are connected. It can also be expressed as a continuous part. Furthermore, the housing part including the discharge pipe 140 may be used without distinguishing the housing part 120 and the discharge pipe 140. In this case, in the example shown in FIG. 2, the housing portion has an inner peripheral surface 120 a and first to third inner surfaces 140 a to 140 c.

The housing portion 120 has a facing surface that faces each of the disk portions 114 and 116 of the drum portion 40 and is connected (coupled) to the inner circumferential surface 120a. The facing surface and the inner circumferential surface 120a.
The drum portion 40 is accommodated in a space surrounded by Furthermore, the discharge pipe 140 has a continuous surface that is continuous (connected) to the inner surfaces 140a, 140b, and 140c. However, for convenience, in FIG. 3 and FIG. 5 described later, the facing surface and the continuous surface are omitted.

  The discharge pipe 140 has a discharge port 146 for discharging the defibrated material. The discharge port 146 is an end portion of the discharge pipe 140 opposite to the housing portion 120. A seal roller 144 is provided at the discharge port 146. The seal roller 144 is, for example, a metal roller, is urged by its own weight or a biasing member such as a spring, and is in contact with the mesh belt 46 in a state where the web V is not deposited on the mesh belt 46. . In a state where the web V is deposited on the mesh belt 46, the seal roller 144 (the right roller in FIGS. 1 to 3) located on the downstream side in the conveyance direction of the web V is in contact with the upper surface of the web V. The seal roller 144 can suppress the defibrated material sorted by the sorting unit 40 from leaking from the gap between the discharge pipe 140 and the mesh belt 46.

  The discharge pipe 140 forms a second flow path 132. The second flow path 132 is formed between the first inner surface 140a and the second inner surface 140b and between the first inner surface 140a and the third inner surface 140c. In the second flow path 132, an air flow A2 along the direction β (vertically downward in the example shown in FIG. 2) is generated. For example, the distance L1 between the first inner surface 140a and the second inner surface 140b is 30 mm or more and 100 mm or less, and the width (depth in the example shown in FIG. 3) L2 is 200 mm or more and 400 mm or less. As shown in FIG. 2, the distance (interval L1) between the first inner surface 140a and the second inner surface 140b facing the first inner surface 140a, and the first surface facing the first inner surface 140a and the first inner surface 140a. The distance between the third inner surface 140 c is preferably shorter than the diameter of the drum portion 40. That is, the first inner surface 140a and the second inner surface 140b are separated by a distance shorter than the diameter of the drum portion, and the first inner surface 140a and the third inner surface 140c are separated by a distance shorter than the diameter of the drum portion. Is preferred. As shown in FIG. 2, the first inner surface 120 a extends in a direction (direction β) along the air flow A <b> 2 that conveys the defibrated material to the deposition surface 46 a of the mesh belt 46.

Specifically, when the interval L1 is 70 mm, the width L2 is 300 mm, and the air volume in the discharge pipe 140 is 2.4 m ³ / min, the average wind speed of the air flow A2 in the second flow path 132 is 1.8 m. / S. In the discharge pipe 140, an air flow along a direction different from the direction of the air flow A2 may be generated.

  The second flow path 132 formed by the discharge pipe 140 is in communication with the first flow path 130. The defibrated material conveyed by the first flow path 130 rides on the airflow A2 and is discharged from the discharge port 146 to the mesh belt 46. The airflows A1 and A2 are generated by, for example, the rotation of the drum unit 40 and the suction unit 48.

  The mesh belt 46 can deposit and move the defibrated material discharged from the discharge pipe 140. The discharge port 146 of the discharge pipe 140 is provided so as to face the accumulation surface 46 a of the mesh belt 46. The deposition surface 46a is a surface on which the web V (defibrated material that has passed through the opening 110 of the drum portion 40) is deposited.

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

In the sheet manufacturing apparatus 100, the housing portion 120 includes an inner peripheral surface 120a along the outer peripheral surface 112a of the drum portion 40, a first flat surface 140a continuous with one end side of the inner peripheral surface 120a, and the other end of the inner peripheral surface 120a. The first plane 140a and the second plane 140b are opposed to each other and separated by a distance shorter than the diameter of the drum portion 40, and the first plane 140a is the inner peripheral surface 120a. One end side (connecting portion 142) of the inner peripheral surface 120a extends in a direction tangential to the direction β along the rotational direction α of the drum portion 40, and extends along a direction A2 that carries the defibrated material to the deposition surface 46a. ing. Therefore, in the sheet manufacturing apparatus 100, it is possible to prevent the defibrated material from adhering to the inner surface (inner peripheral surface) 120a of the housing part 120 without causing the airflows A1 and A2 to stagnate. Thereby, in the sheet manufacturing apparatus 100, the fluctuation | variation of the quantity per unit time of the defibrated material deposited on the mesh belt 46 can be made small. As a result, the sheet manufacturing apparatus 100 can manufacture a sheet having high basis weight uniformity.

  For example, the inner surface of the housing portion does not follow the outer peripheral surface of the drum portion, and the inner surface of the housing portion has a corner (corner portion), or the first plane does not extend in the tangential direction at the connection portion of the housing portion. In some cases, the airflow stagnate in the vicinity of the corner portion or the connection portion, and the defibrated material may adhere to the inner surface of the housing portion.

  In the sheet manufacturing apparatus 100, the inner peripheral surface 120 a of the housing portion 120 facing the outer peripheral surface 112 a of the drum portion 40 is smooth, and the discharge pipe 140 has an inner periphery at a connection portion (switching portion) 142 with the housing portion 120. It has a first inner surface 140a extending in the direction tangential to the surface 120a and in the direction β along the rotational direction α of the drum portion 40. Therefore, in the sheet manufacturing apparatus 100, it is possible to prevent the defibrated material from adhering to the inner surface (inner peripheral surface) 120a of the housing part 120 without causing the airflows A1 and A2 to stagnate. Thereby, in the sheet manufacturing apparatus 100, the fluctuation | variation of the quantity per unit time of the defibrated material deposited on the mesh belt 46 can be made small. As a result, the sheet manufacturing apparatus 100 can manufacture a sheet having high basis weight uniformity.

  For example, if corners (corners) are formed on the inner surface of the housing part, or if the discharge pipe does not have an inner surface extending in the tangential direction at the connection part of the housing part, the air current is generated near the corner part or the connection part. The defibrated material may adhere to the inner surface of the housing portion.

  In the sheet manufacturing apparatus 100, the inner peripheral surface 120a of the housing portion 120 is a curved surface. Thereby, in the sheet manufacturing apparatus 100, the inner peripheral surface 120a can be made smooth.

  In the sheet manufacturing apparatus 100, the discharge port 146 of the discharge pipe 140 is provided so as to face the deposition surface 46 a of the mesh belt 46. Therefore, in the sheet manufacturing apparatus 100, the region where the defibrated material is discharged by the discharge port 146 can be reduced (squeezed), and the length of the mesh belt 46 (the length of one circumference) can be shortened. As a result, the sheet manufacturing apparatus 100 can be downsized. Further, the defibrated material can be conveyed to the downstream side (to the mixing unit 50) in a state where the amount of lumps is reduced, for example, by the mesh belt 46.

  In the sheet manufacturing apparatus 100, the inner peripheral surface 120 a of the housing portion 120 is provided close to the outer peripheral surface 112 a of the drum portion 40. Therefore, in the sheet manufacturing apparatus 100, the wind speed of the airflow A1 can be increased. Specifically, the wind speed of the airflow A1 can be 2 m / s or more. Thereby, in the sheet manufacturing apparatus 100, even if the defibrated material adheres to the inner peripheral surface 120a, the defibrated material is separated from the inner peripheral surface 120a by the air flow A1 before the defibrated material forms a dama. Can do.

  Even if an impact is applied to the housing part, the defibrated material absorbs the impact because the density is low, and it may be difficult to separate the defibrated material from the inner surface of the housing part.

In the sheet manufacturing apparatus 100, the inner peripheral surface 120a of the housing portion 120 is formed of a conductor or antistatic resin. Therefore, in the sheet manufacturing apparatus 100, the defibrated material can be prevented from adhering to the inner peripheral surface 120a by being charged by friction.

  Similar to the sorting unit 40, the stacking unit 60 is configured by a rotatable drum unit, and the sheet manufacturing apparatus 100 is connected to the housing unit 120 and the housing unit 120 provided so as to surround the drum unit. And a discharge pipe 140 for discharging the defibrated material.

  Further, the sheet manufacturing apparatus according to the present invention is provided with a housing part 120 so as to surround either one of the drum part constituting the sorting part 40 and the drum part constituting the stacking part 60, and the housing part 120 has a discharge pipe. 140 may be connected.

  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. Modified example of sheet manufacturing apparatus 2.1. First Modified Example Next, a sheet manufacturing apparatus according to a first modified example of the present embodiment will be described with reference to the drawings. FIG. 5 is a perspective view schematically showing a sheet manufacturing apparatus 200 according to a first modification of the present embodiment. For convenience, members other than the housing part 120, the discharge pipe 140, and the transport pipe 150 are omitted in FIG. 5.

  Hereinafter, in the sheet manufacturing apparatus 200 according to the first modified example of the present embodiment, differences from the example of the sheet manufacturing apparatus 100 according to the present embodiment will be described, and description of similar points will be omitted. The same applies to the sheet manufacturing apparatuses according to the second and third modifications shown below.

  In the sheet manufacturing apparatus 100 described above, as shown in FIGS. 2 and 3, the defibrated material discharged from the discharge port 146 of the discharge pipe 140 is deposited on the mesh belt 46.

  On the other hand, in the sheet manufacturing apparatus 200, the defibrated material discharged from the discharge port 146 of the discharge pipe 140 reaches the conveyance pipe 150 as shown in FIG. The conveyance pipe 150 is a conveyance pipe for conveying the defibrated material discharged from the discharge port 146 of the discharge pipe 140 by the airflow A3, and the defibrated material discharged from the discharge pipe 140 rides on the airflow A3 and is a pipe. 7 (see FIG. 1) and conveyed to the mixing unit 50.

  The transport pipe 150 is connected to the discharge port 146. The transport pipe 150 extends in a direction (for example, a direction orthogonal to the illustrated example) intersecting the tangential direction (for example, the direction β) at the connection portion 142 of the first inner surface 140a of the discharge pipe 140.

  A blower (not shown) is provided at the end 152 of the transport pipe 150 opposite to the pipe 7 side. When the blower is driven, an airflow A3 in a direction orthogonal to the direction of the airflow A2 is generated in the transport pipe 150. A suction part may be provided on the pipe 7 side of the transport pipe 150, and the air flow A3 may be generated in the transport pipe 150 by the suction part.

In the sheet manufacturing apparatus 200, the above-described classification unit is provided, the defibrated material is classified in the classification unit, the classified product is transported to the sorting unit 40, sorted by the sorting unit 40, and sorted first. It is desirable that the sorted product is transported to the mixing unit 50 via the transport pipe 150 and the pipe 7. In this case, an air flow generated by a classification unit such as a cyclone may be used as the air flow A3.

  The sheet manufacturing apparatus 200 includes a conveyance pipe 150 that is connected to the discharge pipe 140 and conveys the defibrated material discharged from the discharge port 146 by the airflow A3. In the sheet manufacturing apparatus 200, similarly to the sheet manufacturing apparatus 100, it is possible to suppress the defibrated material from adhering to the inner peripheral surface 120 a of the housing part 120, and thus the unit of the defibrated material conveyed by the conveying pipe 150. The fluctuation of the amount per hour can be reduced. Furthermore, the defibrated material can be transported with a simple configuration, for example, without using a mesh belt.

2.2. Second Modification Next, a sheet manufacturing apparatus according to a second modification of the present embodiment will be described with reference to the drawings. FIG. 6 is a diagram schematically illustrating a sheet manufacturing apparatus 300 according to the second modification of the present embodiment, and is a diagram illustrating the same cross section as that of FIG. 2 described above.

  In the sheet manufacturing apparatus 100 described above, as shown in FIG. 2, the outer peripheral surface 112 a of the drum portion 40 has a circular shape centering on the position of the rotation axis Q in the cross section cut by a plane orthogonal to the rotation axis Q. The inner peripheral surface 120a of the portion 120 was a part of a circle (arc shape) centered on the position of the rotation axis Q. That is, the center positions of the outer peripheral surface 112a and the inner peripheral surface 120a were the same.

  On the other hand, in the sheet manufacturing apparatus 300, as shown in FIG. 6, the positions of the centers of the outer peripheral surface 112a of the drum portion 40 and the inner peripheral surface 120a of the housing portion 120 are different. The outer peripheral surface 112a is centered on the position of the rotation axis Q, and the inner peripheral surface 120a is centered on a position C different from the position of the rotation axis Q.

  In the illustrated example, the second inner surface 140 b of the discharge pipe 140 is connected to the inner peripheral surface 120 a of the housing portion 120 at the connection portion 143. The outer peripheral surface 112a of the drum part 40 and the connection part 143 are in contact. Therefore, the defibrated material conveyed from the first flow path 130 to the second flow path 132 does not return to the first flow path 130 again.

  In the sheet manufacturing apparatus 300, since the outer peripheral surface 112a and the connection portion 143 are in contact with each other, for example, it is possible to prevent clogging of defibrated material between the outer peripheral surface 112a and the connection portion 143 due to airflow in the connection portion 143. can do. Note that the outer peripheral surface 112a and the connecting portion 143 may be separated as long as the defibrated material cannot pass between the outer peripheral surface 112a and the connecting portion 143.

2.3. Third Modification Next, a sheet manufacturing apparatus according to a third modification of the present embodiment will be described with reference to the drawings. FIG. 7 is a diagram schematically showing a sheet manufacturing apparatus 400 according to a third modification of the present embodiment, and is a diagram showing the same cross section as FIG. 2 described above.

  In the sheet manufacturing apparatus 100 described above, as shown in FIG. 2, the outer peripheral surface 112 a of the drum portion 40 has a circular shape centering on the position of the rotation axis Q in the cross section cut by a plane orthogonal to the rotation axis Q. The inner peripheral surface 120a of the portion 120 was a part of a circle (arc shape) centered on the position of the rotation axis Q.

On the other hand, in the sheet manufacturing apparatus 400, as shown in FIG. 7, the distance D between the inner peripheral surface 120a of the housing portion 120 and the outer peripheral surface 112a of the drum portion 40 is in the rotational direction α of the drum portion 40. It has a shape that grows along.

  In the illustrated example, the second inner surface 140 b of the discharge pipe 140 is connected to the inner peripheral surface 120 a of the housing portion 120 at the connection portion 143. For example, the distance D between the outer peripheral surface 112a of the drum part 40 and the connection part 143 is the smallest, and the outer peripheral surface 112a and the connection part 143 are in contact. The inner peripheral surface 120a has a shape such that the distance D increases from the position of the connecting portion 143 along the rotation direction α of the drum portion 40.

  In the sheet manufacturing apparatus 400, since the outer peripheral surface 112a and the connection portion 143 are in contact with each other, for example, it is possible to prevent clogging of defibrated material between the outer peripheral surface 112a and the connection portion 143 due to airflow in the connection portion 143. can do. Note that the outer peripheral surface 112a and the connecting portion 143 may be separated as long as the defibrated material cannot pass between the outer peripheral surface 112a and the connecting portion 143.

  In addition, the sheet S manufactured by the sheet manufacturing apparatus according to the present invention mainly indicates 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, such as general non-woven fabrics, fiber boards, tissue paper (cleaning tissue paper), kitchen paper, cleaners, filters, liquid (waste ink and oil) absorbers, 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, 2,3,4,5,7,8 ... Tube, 9 ... Hopper, 10 ... Supply part, 12 ... Crushing part, 14 ... Crushing blade, 20 ... Defibration part, 22 ... Inlet port, 24 ... Discharge port, 40 ... Selection unit, 42 ... Introduction port, 44 ... Discharge port, 45 ... First web forming unit, 46 ... Mesh belt, 46a ... Deposition surface, 47, 47a ... Stretch roller, 48 ... Suction unit , 49 ... Rotating body, 49a ... Base, 49b ... Projection, 50 ... Mixing part, 52 ... Additive supply part, 54 ... Pipe, 56 ... Blower, 60 ... Deposition part, 62 ... Inlet, 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 part, 85 ... calendar roller, 86 ... heating Roller, 90 ... cutting part, 92 ... first cutting part, 94 ... second cutting part, 96 Discharge unit, 100 ... sheet manufacturing apparatus, 102 ... manufacturing unit, 104 ... control unit, 110 ... opening, 112 ... net, 112a ... outer peripheral surface, 114, 116 ... disc part, 120 ... housing part, 120a ... inner periphery Surface 130... First flow path 132 132 second flow path 140 discharge tube 140a first inner surface 140b second inner surface 140c third inner surface 142
, 143 ... connection part, 144 ... seal roller, 146 ... discharge port, 150 ... transport pipe, 152 ... end part, 200, 300, 400 ... sheet manufacturing apparatus, A1, A2, A3 ... airflow, C ... position, Q ... Rotation axis, R ... direction, S ... sheet, V, W ... web, α, β ... direction

Claims (9)

A defibrating unit for defibrating raw materials containing fibers into defibrated material;
A plurality of openings for allowing the defibrated material to pass therethrough, and a rotatable drum portion;
A housing portion provided so as to surround the drum portion;
A deposition surface on which the defibrated material that has passed through the opening of the drum portion is deposited;
Have
The housing portion includes an inner peripheral surface along the outer peripheral surface of the drum portion, a first plane continuous with one end side of the inner peripheral surface, a second plane continuous with the other end side of the inner peripheral surface, Have
The first plane and the second plane face each other and are separated by a distance shorter than the diameter of the drum portion,
The first plane extends in a direction tangential to the inner peripheral surface and in a direction along the rotation direction of the drum portion, and extends in a direction along an air flow carrying the defibrated material to the deposition surface. Sheet manufacturing equipment. A defibrating unit for defibrating raw materials containing fibers into defibrated material;
A plurality of openings for allowing the defibrated material to pass therethrough, and a rotatable drum portion;
A housing portion provided so as to surround the drum portion;
A discharge pipe connected to the housing part for discharging the defibrated material;
Have
The inner peripheral surface of the housing portion facing the outer peripheral surface of the drum portion is smooth,
The discharge pipe has an inner surface extending in a direction tangential to an inner peripheral surface of the housing portion at a connection portion with the housing portion and along a rotation direction of the drum portion. apparatus.   The sheet manufacturing apparatus according to claim 2, wherein an inner peripheral surface of the housing portion is a curved surface.   The sheet manufacturing apparatus according to claim 2, wherein an inner peripheral surface of the housing portion is provided along an outer peripheral surface of the drum portion. Depositing the defibrated material discharged from the discharge pipe, and having a movable belt;
The sheet manufacturing apparatus according to any one of claims 2 to 4, wherein a discharge port of the discharge pipe is provided so as to face a deposition surface of the belt. Connected to a discharge port of the discharge pipe, and has a transfer pipe for transferring the defibrated material discharged from the discharge pipe by an air flow;
5. The sheet manufacturing apparatus according to claim 2, wherein the transport pipe extends in a direction crossing the tangential direction. 6.   The sheet manufacturing apparatus according to claim 1, wherein an inner peripheral surface of the housing portion is provided in proximity to an outer peripheral surface of the drum portion.   8. The air flow having a wind speed of 2 m / s or more is generated in a flow path formed between the inner peripheral surface of the housing portion and the outer peripheral surface of the drum portion. The sheet manufacturing apparatus described in 1.   The sheet manufacturing apparatus according to any one of claims 1 to 8, wherein an inner peripheral surface of the housing part is formed of a conductor or antistatic resin.

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