Defibrating device, fiber body manufacturing device

Abstract

The present application provides a kind of defiberation device, fiber body manufacturing device.Defiberation device (200) has: defiberation chamber (210);Discharge passage (310), it is communicated with defiberation chamber (210) to make defiberation from defiberation chamber (210) be discharged;Discharge pipe (30), it discharges the defiberation from discharge passage (310);Discharge part (314), it is communicated with discharge passage (310) and discharge pipe (30);Circular ring screen (221), it delimits defiberation chamber (210);Shell (311,312,313), it has with the way that screen (221) is kept apart outer wall (351) is set, and form discharge passage (310);Multiple through holes (222), it is set on screen (221), and it is communicated with defiberation chamber (210) and discharge passage (310), discharge part (314) is set on outer wall (351), and open towards screen (221).

Description

Technical Field

[0001] This invention relates to a fiber debonding device and a fiber manufacturing device. Background Technology

[0002] Patent Document 1 discloses a defibering device that discharges defibered material formed from raw materials through a discharge channel and a discharge pipe by rotating a rotating body housed in a defibering chamber. The discharge channel extends along the outer side of an annular wall defining the defibering chamber, and the discharge pipe communicates with the discharge channel. In this defibering device, the discharge channel and the defibering chamber are connected through multiple through holes provided on the annular wall of the defibering chamber. Furthermore, the discharge section, which communicates with the discharge channel and the discharge pipe, opens in the direction in which the discharge channel extends.

[0003] However, in the defiber removal device described in Patent Document 1, it is difficult to generate an airflow that causes the defiber to be discharged toward the downstream side of the discharge channel from the discharge section that connects the discharge channel and the discharge pipe, which may cause the defiber to become stuck.

[0004] Patent Document 1: Japanese Patent Application Publication No. 2020-158944 Summary of the Invention

[0005] The defiber device comprises: a rotating body that rotates about the axis of a rotating shaft; a defiber chamber that houses the rotating body and, through the rotation of the rotating body, forms a defiber from a raw material containing fibers; a supply pipe that supplies the raw material to the defiber chamber; a discharge channel that communicates with the defiber chamber and discharges the defiber from the defiber chamber; a discharge pipe that is subjected to negative pressure to discharge the defiber from the discharge channel; a discharge section that communicates with the discharge channel and the discharge pipe; and an annular wall that... The debonding chamber is defined by leaving a gap between itself and the rotating body in the radial direction; the discharge channel is formed by surrounding the outer side of the annular wall in the circumferential direction; a plurality of through holes are provided on the annular wall and communicate between the debonding chamber and the discharge channel; an annular outer peripheral wall is the outer peripheral wall of the housing and is provided by leaving a gap between itself and the annular wall in the radial direction, and the discharge part is provided on the outer peripheral wall and opens toward the annular wall.

[0006] The fiber manufacturing apparatus includes: the defiberization device described above; a sheet forming section that forms a sheet by accumulating the defiberized material discharged from the discharge pipe; and a fiber forming section that forms a fiber containing the fibers by bonding the fibers contained in the sheet together. Attached Figure Description

[0007] Figure 1 This is a schematic diagram showing the structure of a sheet manufacturing apparatus as one embodiment of the present disclosure.

[0008] Figure 2 This is a side view of a fiber unwinding apparatus according to an embodiment of the present disclosure, viewed from the -X direction.

[0009] Figure 3 This is a side view showing the fiber unwinding device as observed from the -Y direction.

[0010] Figure 4 To indicate Figure 3 The sectional view of section d4-d4 shown.

[0011] Figure 5 A three-dimensional diagram representing a solid of revolution.

[0012] Figure 6 This is a three-dimensional view of the defiberization chamber after a portion of the screen has been removed.

[0013] Figure 7 A three-dimensional diagram showing the debonding chamber.

[0014] Figure 8 To indicate Figure 7 An enlarged view of the s8 section shown.

[0015] Figure 9 This is a perspective view of the fiber-removing device after a portion of the casing has been removed.

[0016] Figure 10 A three-dimensional diagram showing the fiber unwinding device.

[0017] Figure 11 To indicate Figure 2 The sectional view of section d11-d11 shown.

[0018] Figure 12 To indicate from Figure 11 A cross-sectional view of the state after removing the rotating body.

[0019] Figure 13 This is a three-dimensional cross-sectional view showing the periphery of the discharge section.

[0020] Figure 14 A cross-sectional view showing the specifications of the discharge channel and discharge section. Detailed Implementation

[0021] The present invention will now be described based on embodiments. Identical components will be labeled with the same reference numerals in the accompanying drawings, and repeated descriptions will be omitted.

[0022] Furthermore, in the accompanying drawings, X, Y, and Z represent three mutually orthogonal spatial axes. In this specification, the directions along these axes will be designated as the X-axis, Y-axis, and Z-axis directions. When orientation is defined, positive directions are designated as "+" and negative directions as "-", and positive and negative signs are used in the direction markings. The direction pointed to by the arrows in each drawing will be designated as the "+" direction, and the opposite direction as the "-" direction. Furthermore, the Z-axis direction represents the direction of gravity; the +Z direction represents vertically downwards, and the -Z direction represents vertically upwards. The plane containing the X and Y axes will be designated as the XY plane, the plane containing the X and Z axes as the XZ plane, and the plane containing the Y and Z axes as the YZ plane. The XY plane is considered a horizontal plane. The three spatial axes X, Y, and Z, which do not define positive and negative directions, will be described as the X-axis, Y-axis, and Z-axis.

[0023] 1. Implementation Method 1

[0024] The structure of the sheet manufacturing apparatus 100 according to Embodiment 1 will be described. The sheet manufacturing apparatus 100 performs a regeneration process that fibersizes the fiber-containing raw material MA and regenerates it into a new sheet S. The sheet manufacturing apparatus 100 is an example of a fiber body manufacturing apparatus. Furthermore, the sheet S is an example of a fiber body.

[0025] like Figure 1 As shown, the sheet manufacturing apparatus 100 includes a receiving and supplying section 10, a coarse crushing section 12, a fiber debonding device 200, a screening section 40, a first sheet forming section 45, a rotating body 49, a mixing section 50, a stacking section 60, a second sheet forming section 70, a conveying section 79, a sheet forming section 80, and a cutting section 90.

[0026] The receiving and supplying section 10 is an automatic feeding device that receives raw material MA and continuously feeds it into the coarse crushing section 12. The raw material MA only needs to be a fibrous material, such as old paper, waste paper, or pulp flakes.

[0027] The coarse crushing section 12 is equipped with coarse crushing blades 14 that cut the raw material MA supplied by the receiving and supplying section 10, and cuts the raw material MA in the air by the coarse crushing blades 14 to make it into fragments several centimeters square. The coarse crushing section 12 can be, for example, a shredder. The raw material MA cut in the coarse crushing section 12 is collected by the hopper 9 and conveyed through the pipe 2 to the supply pipe 20 of the fiber-removing device 200.

[0028] Coarse fragments are conveyed from the coarse fragmentation section 12 to the defiberization device 200 by airflow. In the defiberization device 200, coarse fragments are supplied from the supply pipe 20 to the defiberization chamber 210, which will be described later, and the coarse fragments are defibered by rotating the rotating body 500 housed in the defiberization chamber 210.

[0029] A suction section 35 is provided on the pipe 3 connected to the discharge pipe 30. The suction section 35 includes a blower, which applies negative pressure to the discharge pipe 30 by drawing air from the side of the discharge pipe 30 in the pipe 3. The de-fiber material in the de-fiber chamber 210 is discharged from the de-fiber device 200 via the airflow generated by the negative pressure applied to the discharge pipe 30, through the discharge channel 310 and the discharge pipe 30, which will be described later. The de-fiber material discharged from the de-fiber device 200 is transferred to the screening section 40 via the pipe 3 connected to the discharge pipe 30. The structure of the de-fiber device 200 will be described later.

[0030] The screening section 40 screens the components contained in the desiccant according to the size of the fibers. The screening section 40 has a roller section 41 and a storage section 43 for storing the roller section 41. The roller section 41 is, for example, a sieve.

[0031] The desiccant introduced into the interior of the roller section 41 from the inlet 42 is separated into passable material that passes through the opening of the roller section 41 and residue that does not pass through the opening by the rotation of the roller section 41. The first sieved material, which has passed through the opening, falls towards the first sheet forming section 45 inside the receiving section 43.

[0032] Furthermore, the second screening material, which is a residue that has not passed through the opening, is again conveyed from the discharge port 44, which is connected to the interior of the roller section 41, to the supply pipe 20 of the fiber-removing device 200 via pipes 8 and 2.

[0033] The first sheet forming section 45 includes a mesh belt 46, mounting rollers 47 and 47a, and a suction section 48. The mesh belt 46 is a seamless belt mounted on multiple mounting rollers 47 and 47a. The mesh belt 46 rotates around a track formed by the mounting rollers 47 and 47a. A portion of the track of the mesh belt 46 is flat below the roller section 41, thus making the mesh belt 46 a flat surface. The suction section 48 functions as a suction mechanism.

[0034] Multiple openings are formed on the mesh belt 46. Components in the first screened material that are larger than the openings in the mesh belt 46 and fall from the roller section 41 located above the mesh belt 46 will accumulate on the mesh belt 46. Conversely, components in the first screened material that are smaller than the openings in the mesh belt 46 will pass through the openings.

[0035] The suction section 48 is equipped with a blower (not shown) and draws air from the side opposite to the drum section 41 relative to the mesh belt 46. Components passing through the openings in the mesh belt 46 are drawn in through the suction section 48. The airflow drawn by the suction section 48 has the effect of promoting accumulation by bringing the first screened material falling from the drum section 41 closer to the mesh belt 46.

[0036] The components accumulated on the mesh belt 46 form a sheet shape, thereby constituting the first sheet Wb1. The basic structure of the mesh belt 46, the support rollers 47, 47a and the suction unit 48 is the same as that of the mesh belt 72, the support roller 74 and the suction mechanism 76 of the second sheet forming unit 70, which will be described later.

[0037] The first material piece Wb1 is conveyed to the rotating body 49 along with the movement of the mesh belt 46.

[0038] The rotating body 49 has a base 49a connected to a drive unit (not shown) such as a motor, and a protrusion 49b protruding from the base 49a. By rotating the base 49a in direction D, the protrusion 49b rotates around the base 49a.

[0039] The rotating body 49 is located at the end of the flat section of the track of the mesh belt 46 on the side of the mounting roller 47a. Because the track of the mesh belt 46 bends downward at this end, the first sheet Wb1 conveyed by the mesh belt 46 protrudes from the mesh belt 46 and contacts the rotating body 49. The first sheet Wb1 is broken up into smaller fiber blocks by colliding with the protrusion 49b. These blocks pass through the tube 7 located below the rotating body 49 and are conveyed to the mixing section 50.

[0040] The mixing unit 50 mixes the first screened material and the additive. The mixing unit 50 includes an additive supply unit 52 for supplying the additive, a pipe 54 for conveying the first screened material and the additive, and a mixing blower 56.

[0041] The additive supply unit 52 supplies the tube 54 with additives consisting of micro powders or microparticles inside the additive box 52a.

[0042] The additive supplied from the additive supply section 52 contains a resin, i.e., an adhesive, for bonding multiple fibers together. The resin contained in the additive melts as it passes through the sheet forming section 80, thereby bonding the multiple fibers together.

[0043] The mixing blower 56 generates airflow in the pipe 54 that connects the pipe 7 and the stacking section 60. In addition, the first screen material conveyed from the pipe 7 to the pipe 54 and the additive supplied to the pipe 54 through the additive supply section 52 are mixed as they pass through the mixing blower 56.

[0044] The stacking section 60 breaks down the fibers of the mixture to disperse them in the air while they fall into the second sheet forming section 70.

[0045] The accumulation section 60 has a roller section 61, an inlet 62 for introducing a mixture into the roller section 61, and a storage section 63 for storing the roller section 61. The roller section 61 is, for example, a cylindrical structure constructed in the same manner as the roller section 41, and like the roller section 41, it is rotated by the power of a motor (not shown) and functions as a sieve.

[0046] A second sheet forming section 70 is disposed below the roller section 61. The second sheet forming section 70 includes, for example, a mesh belt 72, a support roller 74, and a suction mechanism 76.

[0047] The larger components of the mixture falling from the roller section 61 located above the mesh belt 72 accumulate on the mesh belt 72. The components accumulated on the mesh belt 72 form a sheet shape, thereby constituting the second sheet Wb2.

[0048] In the conveying path of the mesh belt 72, a humidity regulating section 78 is provided on the downstream side of the stacking section 60. Since the moisture content of the second sheet Wb2 is adjusted by the moisture supplied by the humidity regulating section 78, it is expected to suppress the adsorption of fibers to the mesh belt 72 caused by static electricity.

[0049] The second sheet Wb2 is peeled off from the mesh belt 72 via the conveyor section 79 and conveyed to the sheet forming section 80. The conveyor section 79 includes, for example, a mesh belt 79a, a roller 79b, and a suction mechanism 79c. The suction mechanism 79c includes a blower (not shown), and the blower's suction force passes through the mesh belt 79a, generating an upward airflow. This airflow causes the second sheet Wb2 to be peeled off from the mesh belt 72 and adhered to the mesh belt 79a. The mesh belt 79a moves due to the rotation of the roller 79b, thereby conveying the second sheet Wb2 to the sheet forming section 80.

[0050] The mesh belt 79a can be made of a belt with an open, jointless shape, similar to mesh belts 46 and 72.

[0051] The sheet forming section 80 applies heat to the second sheet Wb2, thereby using the resin contained in the additives to bond the fibers derived from the first screened material together in the second sheet Wb2.

[0052] The sheet forming section 80 includes a pressing section 82 for pressing a second sheet Wb2, and a heating section 84 for heating the second sheet Wb2 pressed by the pressing section 82. The pressing section 82 presses the second sheet Wb2 with a predetermined clamping force by a calendering roller 85 and conveys it toward the heating section 84. The heating section 84 clamps the high-density second sheet Wb2 with a pair of heating rollers 86 to apply heat and conveys it to the cutting section 90. In the heating section 84, the resin contained in the second sheet Wb2 is heated, thereby forming a sheet S. The sheet forming section 80 is an example of a fiber forming section.

[0053] The cutting section 90 cuts the sheet S formed by the sheet forming section 80. The cutting section 90 has a first cutting section 92 and a second cutting section 94. The first cutting section 92 cuts the sheet S in a direction intersecting the conveying direction F1 of the sheet S (shown as symbol F1 in the figure), and the second cutting section 94 cuts the sheet S in a direction parallel to the conveying direction F1. The cutting section 90 cuts the sheet S to predetermined dimensions in both length and width, thereby forming a single sheet S. The sheet S cut by the cutting section 90 is stored in the discharge section 96.

[0054] Next, the structure of the defiber device 200 will be described. The defiber device 200 is a device for processing raw material MA, in which multiple fibers are bonded together, into one or a small number of fibers. The defiber device 200 is a dry defiber processing device that performs defibering and other processes in the atmosphere or air, not in a liquid.

[0055] like Figures 2 to 5 As shown, the defiberizing apparatus 200 includes a rotating body 500, a defiberizing chamber 210, a supply pipe 20, a discharge channel 310, and a discharge pipe 30. The defiberizing apparatus 200 forms defibered material from raw material MA supplied via the supply pipe 20 by rotating the rotating body 500, housed in the defiberizing chamber 210, about the axis AR of the rotating shaft 501. Furthermore, the defiberizing apparatus 200 includes a screen 221 defining the defiberizing chamber 210, a fixing member 211, and side walls 212 and 213; housings 311, 312, and 313 defining the discharge channel 310; support portions 401 and 402 supporting the rotating body 500; and a closing member 601. In the following description, the direction of rotation of the rotating shaft 501 about the axis AR is sometimes referred to as the circumferential direction CR, and the radial direction of the rotating shaft 501 is sometimes referred to as the radial direction RR.

[0056] The rotating body 500 includes a rotating shaft 501, a base 502, a rotating blade 503, and a rotating vane 504. The rotating body 500 is housed in the debonding chamber 210 such that the axis AR of the rotating shaft 501 is aligned with the Y-axis. Therefore, the rotating shaft 501 extends in the Y-axis direction. In other words, the debonding device 200 is arranged in the sheet manufacturing apparatus 100 with the axis AR horizontal. The base 502 is plate-shaped and fixed by being inserted through the rotating shaft 501. The rotating blade 503 is provided to protrude radially away from the base 502. The rotating blade 503 has a plate-shaped protrusion. Multiple rotating blades 503 are formed at intervals in the circumferential direction CR.

[0057] On the +Y direction side of the base 502, multiple rotating blades 503 are arranged at intervals along the circumferential CR direction. Although as Figure 5 As shown, in this embodiment, the rotating blade 503 and the base 502 are formed by laminating a thin plate in the Y-axis direction, but they can also be formed by an integrally shaped block.

[0058] like Figure 4 , Figure 6 As shown, the fixing component 211 is cylindrical. The fixing component 211 is located on the +Y direction side of the rotating blade 503 in the Y-axis direction.

[0059] like Figure 4 , Figure 10 , Figure 12 As shown, the sidewall 212 is in the shape of a circular plate. The sidewall 212 is located on the +Y direction side of the fixing member 211. By being fixed to the fixing member 211, the sidewall 212 defines the inner surface of the fiber unwinding chamber 210 on the +Y direction side. A support portion 401, a supply pipe 20, and a supply portion 214 are provided on the sidewall 212.

[0060] The support portion 401 is located at the center of the side wall 212. The support portion 401 is located on the +Y direction side relative to the rotating edge 503 of the rotating body 500. The support portion 401 supports the rotation axis 501 of the rotating body 500 in a manner that allows the rotating body 500 to rotate around the axis AR. The support portion 401 supports the rotation axis 501 of the rotating body 500 on the +Y direction side relative to the rotating edge 503.

[0061] The rotating shaft 501 is driven to rotate by a drive mechanism (not shown). In this embodiment, the drive mechanism consists of a belt and pulleys, and transmits power to the belt and pulleys from a rotational drive source (not shown), thereby causing the rotating body 500 to rotate about the axis AR as its center of rotation. Although in this embodiment, the rotating body 500... Figure 11It rotates counterclockwise around axis AR, but it can also rotate clockwise. Alternatively, the rotating body 500 can also... Figure 11 The shaft 501 rotates clockwise and counterclockwise around its axis AR. Furthermore, the structure driving the rotation of the shaft 501 may not necessarily consist of a belt and pulleys.

[0062] The supply pipe 20 supplies the fiber-containing raw material MA to the defiberization chamber 210. For example... Figure 4 , Figure 6 , Figure 12 As shown, the supply pipe 20 is tubular. The supply pipe 20 is disposed on the surface of the side wall 212 in the +Y direction. The supply pipe 20 is positioned on the side wall 212 at a position in the -Z direction, which is the axis AR that forms the rotation shaft 501. The supply pipe 20 extends in the Y-axis direction. The supply section 214 is a circular through-hole penetrating the side wall 212 in the Y-axis direction. The supply section 214 connects the supply pipe 20 to the debonding chamber 210. Therefore, the supply section 214 opens on the side wall 212 at a position vertically above the axis AR that forms the rotation shaft 501, i.e., in the -Z direction. In other words, the supply section 214 opens on the side wall 212 at a position further away from the discharge section 314, which will be described later, than the axis AR.

[0063] like Figure 4 , Figure 6 , Figure 10 As shown, the sidewall 213 is in the shape of a circular plate. The sidewall 213 is located on the -Y direction side of the fixing member 211. Furthermore, the sidewall 213 is located on the -Y direction side of the rotating blade 503 of the rotating body 500. The sidewall 213 is fixed to the fixing member 211 via the screen 221, thereby defining the inner surface of the defiberization chamber 210 on the -Y direction side. On the sidewall 213, a support portion 402 is provided to support the rotating shaft 501 of the rotating body 500 on the -Y direction side compared to the rotating blade 503.

[0064] like Figure 4 , Figures 6 to 9 , Figures 11 to 14 As shown, the screen 221 is in the shape of a thin plate. The screen 221 is located between the fixing member 211 and the side wall 213 in the Y-axis direction. The screen 221 is formed into a ring shape by being fixed to the fixing member 211 and the side wall 213. The screen 221 is arranged such that it leaves a gap with the rotating blade 503 in the radial direction RR.

[0065] The width of the screen 221 in the Y-axis direction is larger than that of the rotating blade 503 in the Y-axis direction. In the Y-axis direction, the tip of the rotating blade 503 lies within the width of the screen 221. The screen 221, by being fixed to the fixing member 211 and the side wall 213, defines the inner circumferential surface of the cylindrical defiber-removing chamber 210. The screen 221 defines the area in the inner circumferential surface of the defiber-removing chamber 210 opposite to the tip of the rotating blade 503. The screen 221 is an example of an annular wall.

[0066] The screen 221 is, for example, made of a thin sheet metal component. In this embodiment, the screen 221 is formed into a ring by arranging multiple thin sheet metal components along the circumferential direction CR and fixing them to the fixing member 211 and the side wall 213. For example, stainless steel can be used as the metal material. Figure 8 As shown, a plurality of through holes 222 extending through the screen 221 in the thickness direction are formed on the screen 221. In this embodiment, the plurality of through holes 222 have the same shape. The through holes 222 in this embodiment are circular holes. The aperture of the through holes 222 is set to a size that allows the defibered material to pass through to the desired degree. In addition, the opening shape of the through holes 222 may not be circular, but may be rectangular or polygonal. The screen 221 may also be formed by forming the through holes 222 on a thin plate component using punching, etching, cutting, or other processes. In addition, the screen 221 may also be constructed from a single thin plate component.

[0067] like Figure 7 , Figure 8 , Figure 11 As shown, a plurality of through holes 222 are provided in such a way that they are distributed on the circumferential CR of the screen 221. For example, in this embodiment, the through hole array formed by the through holes 222 arranged in the Y-axis direction is provided to span the entire circumference of the screen 221 with the same spacing on the circumferential CR.

[0068] Alternatively, the through holes 222 arranged in the Y-axis direction can be arranged in a row spanning the entire circumference of the screen 221 with varying intervals along the circumferential direction CR. Furthermore, the through holes 222 arranged in both the Y-axis and circumferential directions can be arranged in groups spanning the entire circumference of the screen 221 with equal intervals along the circumferential direction CR. Although in this embodiment, the same number of through holes 222 are arranged in the Y-axis direction to form a through hole row, the number of through holes forming the through hole row can vary between the rows.

[0069] When through holes 222 are formed on a thin sheet component by etching, the material of the thin sheet component can be, for example, SUS430, SUS304, SUS316L, etc. Alternatively, the screen 221 can also be a mesh constructed by weaving in metal wires. In this case, the mesh openings correspond to the through holes 222.

[0070] like Figure 4 , Figures 9 to 14 As shown, housings 311, 312, and 313 are arranged to surround the outer side of screen 221 in the circumferential direction CR. By covering the outer side of screen 221 in a manner spanning the entire circumference in the circumferential direction CR, housings 311, 312, and 313 form a discharge channel 310. Housings 311, 312, and 313 are fixed to fixing member 211 and side wall 213, sandwiching screen 221. Housings 311, 312, and 313 have an outer peripheral wall 351, a side wall 352, and a side wall 353. The outer peripheral wall 351 is arranged with a gap W between it and screen 221 in the radial direction RR. The outer peripheral wall 351 is annular. The gap W between the outer peripheral wall 351 and screen 221 in the radial direction RR is the internal dimension of the discharge channel 310 in the radial direction RR.

[0071] The outer peripheral wall 351 defines the inner peripheral surface of the discharge channel 310. The side wall 352 is located on the +Y direction side of the outer peripheral wall 351 and defines the inner surface of the discharge channel 310 on the +Y direction side. The side wall 353 is located on the -Y direction side of the side wall 352 and defines the inner surface of the discharge channel 310 on the -Y direction side. Furthermore, the interval D between the side walls 352 and 353 in the Y-axis direction is the internal dimension of the discharge channel 310 in the Y-axis direction. In this embodiment, the discharge channel 310 is formed into a ring shape by clamping the screen 221 onto the fixing member 211 and the side wall 213 in such a way that the three housings 311, 312, and 313 are arranged along the circumferential direction CR.

[0072] like Figure 4 , Figures 11 to 14 As shown, the discharge channel 310 is arranged to span the entire circumference of the screen 221 on the outer side. The discharge channel 310 communicates with the defiber chamber 210 through a plurality of through holes 222 provided on the screen 221. The defiber formed in the defiber chamber 210 is discharged into the discharge channel 310 through the plurality of through holes 222. Alternatively, the discharge channel 310 may be formed by a housing component.

[0073] A discharge pipe 30 and a discharge section 314 are provided on the outer peripheral wall 351 of the housing 311. The discharge pipe 30 is located on the +Z direction side of the outer peripheral wall 351 of the housing 311. The discharge pipe 30 is located on the +Z direction side directly below the axis AR that forms the rotation axis 501. Therefore, the discharge pipe 30 is located at the lowest position on the outer peripheral wall 351. The discharge pipe 30 is tubular. The discharge pipe 30 extends from the outer peripheral wall 351 in the +Z direction.

[0074] The discharge section 314 is a through hole penetrating the outer peripheral wall 351 in the Z-axis direction. The discharge section 314 is approximately quadrilateral in shape when viewed from the Z-axis direction. The opening edge 315 is the edge of the discharge channel 310 side opening of the discharge section 314. The dimension of the opening edge 315 in the Y-axis direction is the same as the internal dimension of the discharge channel 310 in the Y-axis direction. The dimension of the opening edge 315 in the X-axis direction is set to 40mm to 50mm. The dimension of the discharge section 314 in the Y-axis direction is the same as the internal dimension of the discharge channel 310 in the Y-axis direction.

[0075] The discharge section 314 communicates with the discharge channel 310 and the discharge pipe 30. The discharge section 314 is provided on the outer peripheral wall 351 and opens toward the screen 221. Therefore, the discharge section 314 is located on the outer peripheral wall 351 at a position vertically below the axis AR of the rotation shaft 501, i.e., in the +Z direction. In other words, the discharge section 314 is located at the lowest position in the outer peripheral wall 351.

[0076] In this embodiment, the gap D between sidewalls 352 and 353 spans the entire circumference of screen 221 and is the same. The gap D is set to a predetermined size of, for example, 40 mm to 50 mm. On the other hand, the gap W between the outer peripheral wall 351 and screen 221 is such that, compared with the opposing area opposite to the discharge portion 314, the area on the circumferential CR of screen 221 that is farther away from the opposing area opposite to the discharge portion 314 becomes narrower.

[0077] For example, such as Figure 14 As shown, the interval W of the region in the discharge channel 310 located in the -Z direction of the axis AR is designated as interval W1, the interval W of the region in the +X direction of the axis AR is designated as interval W2, the interval W of the region in the +Z direction of the axis AR is designated as interval W3, and the interval W of the region in the -X direction of the axis AR is designated as interval W4. At this time, interval W1 is narrower than interval W3. Furthermore, intervals W2 and W4 are narrower than interval W3. Additionally, interval W1 is narrower than intervals W2 and W4. Furthermore, in this embodiment, intervals W2 and W4 are the same.

[0078] Furthermore, in this embodiment, the interval W gradually decreases along the circumferential CR of the screen 221 as it moves away from the discharge portion 314. Additionally, the interval D between sidewalls 352 and 353 is the same across the entire circumference of the screen 221. Therefore, the flow channel cross-sectional area of ​​the discharge channel 310 gradually decreases along the circumferential CR of the screen 221 as it moves away from the discharge portion 314. Furthermore, in this embodiment, for example, interval W1 is set to 5 mm, intervals W2 and W4 are set to 10 mm, and interval W3 is set to 15 mm.

[0079] like Figure 4 , Figures 11 to 14 As shown, the sealing member 601 is provided on the outer peripheral surface side of the discharge channel 310 side of the screen 221. The sealing member 601 is located on the +Z direction side of the axis AR. The sealing member 601 closes the opening of the discharge channel 310 side of the through hole 222 by covering the outer peripheral surface of the discharge channel 310 side of the screen 221. The sealing member 601 closes the through hole 222 provided in the area near the discharge section 314 in the screen 221. Alternatively, the sealing member 601 may also be provided on the inner peripheral surface side of the defiber chamber 210 side of the screen 221. In this case, the sealing member 601 closes the opening of the defiber chamber 210 side of the through hole 222 by covering the inner peripheral surface of the defiber chamber 210 side of the screen 221.

[0080] In the discharge channel 310, a negative pressure generated by the suction unit 35 is easily generated in the region near the discharge section 314. As a result, the airflow velocity passing through the through hole 222, which is located in the region near the discharge section 314, easily increases. In this situation, there is a possibility that insufficiently de-fibered material may be discharged into the discharge channel 310. Alternatively, there is a possibility that insufficiently de-fibered material may block the through hole 222.

[0081] In this embodiment, the through holes 222 in the area of ​​the screen 221 near the discharge section 314 are sealed by the sealing member 601. Therefore, compared to the case where the through holes 222 in the area near the discharge section 314 are not sealed, the sealing member 601 can reduce the amount of undefused material discharged into the discharge channel 310. Thus, compared to the case where the through holes 222 in the area near the discharge section 314 are not sealed, the defibering deviation of the defused material discharged into the discharge channel 310 can be reduced. Furthermore, compared to the case where the through holes 222 in the area near the discharge section 314 are not sealed, the amount of defused material clogging the through holes 222 can be reduced.

[0082] In this embodiment, the dimension of the sealing member 601 in the Y-axis direction is the same as the dimension of the discharge channel 310 in the Y-axis direction. The dimension of the sealing member 601 in the X-axis direction is larger than the dimension of the opening edge portion 315 in the discharge portion 314 in the X-axis direction.

[0083] In addition, such as Figure 14 As shown, the angle formed between the line segment connecting the shaft AR and the +X direction end of the closing member 601, and the line segment connecting the shaft AR and the +X direction end of the opening edge 315, is θ. Furthermore, the angle formed between the line segment connecting the shaft AR and the -X direction end of the closing member 601, and the line segment connecting the shaft AR and the -X direction end of the opening edge 315, is θ. Therefore, the position of the +X direction end of the closing member 601 is offset by an angle θ relative to the position of the +X direction end of the opening edge 315. Similarly, the position of the -X direction end of the closing member 601 is offset by an angle θ relative to the position of the -X direction end of the opening edge 315. In this embodiment, the angle θ is set to, for example, 5° to 15°.

[0084] The through-hole 222 in the screen 221 located in the area covered by the enclosed member 601 on the outer peripheral surface does not communicate with the debonding chamber 210 and the discharge channel 310. In other words, the through-hole 222 that communicates with the debonding chamber 210 and the discharge channel 310 is not provided in the area of ​​the screen 221 covered by the enclosed member 601. Furthermore, in this embodiment, the through-hole 222 that communicates with the debonding chamber 210 and the discharge channel 310 is not provided in the area of ​​the screen 221 between the center of the discharge section 314 in the Z-axis direction and the rotation axis 501.

[0085] Furthermore, when a line segment orthogonal to the axis AR and connecting the axis AR and the center of the discharge section 314 is designated as the projection line segment, and the direction along the projection line segment is designated as the projection direction, and the opening edge 315 of the discharge section 314 is projected onto the screen 221, in this embodiment, no through hole 222 communicating between the defiberization chamber 210 and the discharge channel 310 is provided in the area surrounded by the opening edge 315 projected onto the screen 221. Additionally, in this embodiment, the projection direction is along the Z-axis direction.

[0086] Furthermore, in this embodiment, when the line segment orthogonal to the axis AR and connecting the axis AR and the opening edge 315 of the discharge section 314 is designated as an imaginary line segment LD, the area surrounded by the imaginary line segment LD in the screen 221 is designated as region RD, and the through hole 222 in the through hole 222 that connects the defiber chamber 210 and the discharge channel 310 is designated as a connecting hole, no connecting hole is provided in region RD.

[0087] As a result, when the area of ​​the screen 221 other than region RD is designated as region ERD (not shown), the number of the aforementioned connecting holes per unit area of ​​region RD is less than that of region ERD. Furthermore, when the area of ​​the screen 221 with the narrowest interval W1 between itself and the outer peripheral wall 351 is designated as region RN, and the area of ​​the screen 221 other than region RN is designated as region ERN (not shown), the number of the aforementioned connecting holes per unit area of ​​region RN is more than that of region ERN. Moreover, the number of the aforementioned connecting holes per unit area of ​​region RN is more than that of region RD. In this case, for example, when the ratio of the total opening area of ​​the aforementioned connecting holes in region R of the screen 221 to the area of ​​region R is defined as the opening ratio, it can also be said that the opening ratio of region RN is higher than that of region RD. Additionally, in this embodiment, region RN and the area with the narrowest interval W1 in the discharge channel 310 are located in the -Z direction, which is vertically above the axis AR.

[0088] Although in this embodiment, by using the sealing member 601 to cover the outer peripheral surface of the screen 221, a region on the screen 221 without the through hole 222 communicating with the defiberization chamber 210 and the discharge channel 310 is formed, it is also possible to form a region on the screen 221 without the through hole 222 communicating with the defiberization chamber 210 and the discharge channel 310 by not forming the through hole 222 in the region on the outer peripheral surface of the screen 221 covered by the sealing member 601.

[0089] Next, the operation of the defiberization device 200 will be explained. The defiberization device 200 guides the raw material MA supplied to the defiberization chamber 210 into the gap between the rotating blade 503 of the rotating body 500 and the screen 221 by airflow, and performs dry defiberization treatment on the raw material MA.

[0090] In this embodiment, such as Figure 4 As shown, the raw material MA fed from the supply pipe 20 of the defiberizing device 200 is introduced into the defiberizing chamber 210 through the supply section 214. In the defiberizing chamber 210, the rotating body 500 is rotated by driving the rotating shaft 501 to rotate. Furthermore, a negative pressure generated by the suction section 35 is applied to the discharge channel 310 via the discharge pipe 30. Thus, in the defiberizing chamber 210, the discharge channel 310, and the discharge pipe 30, as shown... Figure 4 The airflow is generated as indicated by the dashed arrow.

[0091] The airflow transports the raw material MA to the gap between the tip of the rotating blade 503 and the screen 221. The raw material MA, transported to this gap, is propelled by centrifugal force from the rotating body 500 and collides with the screen 221, thus being defiberized. In other words, in the defiberization chamber 210, the raw material MA is defiberized to generate defiberized material.

[0092] The defiberized material, broken down to the point of passing through the through-holes 222 in the defiberization chamber 210, is passed through the through-holes 222 of the screen 221 by airflow and flows into the discharge channel 310. The defiberized material flowing into the discharge channel 310 is then passed through the discharge section 314 by airflow and moved to the discharge pipe 30, where it is discharged into the pipe 3 connected to the discharge pipe 30. This airflow that moves the defiberized material is generated by the pressure difference between the negative pressure applied to the discharge pipe 30 by the suction section 35 and the pressure within the discharge section 314, the discharge channel 310, and the defiberization chamber 210, which is upstream of the discharge pipe 30. For example, the airflow passing through the through-holes 222 of the screen 221 is generated by the pressure difference between the negative pressure from the suction section 35 acting on the discharge channel 310 and the pressure within the defiberization chamber 210.

[0093] When the negative pressure from the suction unit 35 is not uniformly applied to the discharge channel 310, the airflow velocity through the through holes 222 of the screen 221 will deviate. As a result, the defibering deviation of the defiber discharged from the defibering chamber 210 to the discharge channel 310 will increase. For example, in areas where the negative pressure in the discharge channel 310 is low and the airflow velocity through the through holes 222 of the screen 221 is slow, the residence time in the defibering chamber 210 will be longer, resulting in an increase in over-defibered material. On the other hand, in areas where the negative pressure in the discharge channel 310 is high and the airflow velocity through the through holes 222 of the screen 221 is fast, the residence time in the defibering chamber 210 will be shorter, resulting in an increase in under-defibered material.

[0094] In this embodiment, such as Figure 11 As shown, the discharge channel 310 is provided to cover the entire circumference of the outer side of the screen 221. Furthermore, a discharge portion 314 is provided on the outer peripheral wall 351 of the housings 311, 312, and 313 forming the discharge channel 310, and opens towards the screen 221. This facilitates the application of negative pressure generated by the suction portion 35 to the upstream side of the discharge channel 310, which is farther from the discharge portion 314. Therefore, it is possible to suppress the discharge of over-defused material into areas of the screen 221 farther from the discharge portion 314, thereby reducing defibering deviation of the defused material discharged into the discharge channel 310.

[0095] In addition, such as Figure 11As indicated by the dashed arrows, in the region of the discharge channel 310 that is on the +X direction side relative to the axis AR, a clockwise airflow toward the discharge portion 314 can be generated, while in the region that is on the -X direction side relative to the axis AR, a counterclockwise airflow toward the discharge portion 314 can be generated. Furthermore, in the region of the discharge channel 310 furthest from the discharge portion 314 and located on the -Z direction side vertically above the axis AR, both clockwise and counterclockwise airflow toward the discharge portion 314 can be generated.

[0096] As described above, the following effects can be obtained from the fiber unwinding apparatus 200 and the sheet manufacturing apparatus 100 according to Embodiment 1.

[0097] The fiber-debonding device 200 includes: a rotating body 500 that rotates about the axis AR of a rotating shaft 501; a fiber-debonding chamber 210 that houses the rotating body 500 and forms a debonded material from the fiber-containing raw material MA by rotating the rotating body 500; a supply pipe 20 that supplies the raw material MA to the fiber-debonding chamber 210; a discharge channel 310 that communicates with the fiber-debonding chamber 210 and discharges the debonded material from the fiber-debonding chamber 210; a discharge pipe 30 that is subjected to negative pressure to discharge the debonded material from the discharge channel 310; a discharge section 314 that communicates with the discharge channel 310 and the discharge pipe 30; and an annular screen 221 that... The rotating body 500 is arranged with a gap between itself and the rotating body 500 in the radial direction RR, and the defiber-removing chamber 210 is defined therein; the housings 311, 312, and 313 form the discharge channel 310 by surrounding the outer side of the screen 221 in the circumferential direction CR; a plurality of through holes 222 are provided on the screen 221 and communicate between the defiber-removing chamber 210 and the discharge channel 310; the annular outer peripheral wall 351 is the outer peripheral wall 351 of the housings 311, 312, and 313 and is arranged with a gap between itself and the screen 221 in the radial direction RR, and the discharge part 314 is provided on the outer peripheral wall 351 and opens toward the screen 221. Therefore, by providing the discharge channel 310 across the entire circumference of the screen 221 and by arranging the discharge portion 314 to open towards the screen 221, it is easier for the negative pressure generated by the suction portion 35 to act on the upstream side of the discharge channel 310, which is farther from the discharge portion 314. This ensures that the airflow in the defiber chamber 210, the through-hole 222 of the screen 221, and the discharge channel 310 discharges the defiber material towards the downstream side of the discharge channel 310, thereby suppressing the retention of the defiber material.

[0098] On the circumferential CR of the screen 221, the distance W between the outer peripheral wall 351 and the screen 221 gradually decreases as it moves away from the discharge section 314. This reduces the pressure difference within the discharge channel 310. Furthermore, it facilitates increasing the average airflow velocity in the region of the discharge channel 310 furthest from the discharge section 314. Additionally, it allows the central region of the discharge channel 310, where the airflow velocity is highest, to be closer to the screen 221. Therefore, it suppresses the retention of undefused material in the discharge channel 310. Furthermore, by uniformly applying the negative pressure generated by the suction section 35 within the discharge channel 310, defibering deviations such as undefibered and over-defibered material can be reduced.

[0099] The through holes 222 are distributed on the circumferential CR of the screen 221. As a result, the defiber formed by the defiber chamber 210 can be efficiently discharged from the screen 221 to the discharge channel 310.

[0100] The rotating body 500 is housed in the debonding chamber 210 such that its axis AR intersects the Z-axis, and the discharge section 314 is located at the lowest position in the outer peripheral wall 351. This allows the gravity acting on the debonded material to act as a force toward the discharge section 314 on the debonded material being discharged into the discharge channel 310. Therefore, the debonded material in the discharge channel 310 can be efficiently discharged from the discharge channel 310 toward the discharge pipe 30.

[0101] When the line segment orthogonal to the axis AR and connecting the axis AR and the opening edge 315 of the discharge section 314 is designated as an imaginary line segment LD, the area enclosed by the imaginary line segment LD in the screen 221 is designated as region RD, the area in the screen 221 other than region RD is designated as region ERD, and the multiple through holes 222 are of the same shape and the through holes 222 that connect the defiberization chamber 210 and the discharge channel 310 are designated as connecting holes, the number of connecting holes provided per unit area in region RD is less than that in region ERD. Therefore, it is easier to make the negative pressure generated by the suction section 35 act on the upstream side of the discharge channel 310 that is farther from the discharge section 314. Thus, it is possible to suppress the discharge of over-defibered material into the area of ​​the screen 221 that is farther from the discharge section 314, thereby reducing the defiberization deviation of the defibered material discharged into the discharge channel 310. Furthermore, it can ensure that the airflow in the defiber chamber 210, the through hole 222 of the screen 221 and the discharge channel 310 causes the defiber to be discharged towards the downstream side of the discharge channel 310, thereby suppressing the retention of the defiber.

[0102] When the area with the narrowest interval W between the screen 221 and the outer peripheral wall 351 is designated as region RN, and the area of ​​the screen 221 excluding region RN is designated as region ERN, the number of connecting holes per unit area in region RN is greater than that in region ERN. This makes it easier to increase the airflow velocity through the through holes 222 in region RN of the screen 221. Therefore, it is possible to suppress the discharge of over-defused material into region RN of the screen 221, thereby reducing the defibering deviation of the defused material discharged into the discharge channel 310. Furthermore, it is possible to ensure that the airflow in the defibering chamber 210, the through holes 222 of the screen 221, and the discharge channel 310 discharges the defused material towards the downstream side of the discharge channel 310, thereby suppressing the retention of defused material.

[0103] The connecting hole is not provided in region RD. This makes it easier for the negative pressure generated by the suction unit 35 to act on the upstream side of the discharge channel 310, which is farther from the discharge unit 314. Therefore, it ensures an airflow in the unwinding chamber 210 and the discharge channel 310 that discharges the unwound material towards the downstream side of the discharge channel 310, thereby suppressing the retention of unwound material. Furthermore, compared to the case where the through hole 222 is provided in region RD, it reduces unwinding deviation caused by an increase in unwound material.

[0104] The debonding device 200 also includes a side wall 212 that defines the debonding chamber 210. A support portion 401 supporting the rotation shaft 501 and a supply portion 214 communicating between the supply pipe 20 and the debonding chamber 210 are provided on the side wall 212. The supply portion 214 opens in the side wall 212 at a position farther from the axis AR than the discharge portion 314. Therefore, by shortening the distance between the region RN in the discharge channel 310 furthest from the discharge portion 314 and the supply portion 214, the airflow from the supply portion 214 toward the region RN can be increased. Thus, airflow that discharges the debonded material toward the downstream side of the discharge channel 310 in the debonding chamber 210 and the discharge channel 310 can be ensured, thereby suppressing the retention of the debonded material.

[0105] The sheet manufacturing apparatus 100 includes: a defiberizing device 200; a second sheet forming section 70, which forms a second sheet Wb2 by accumulating the defiberized material discharged from the discharge pipe 30; and a sheet forming section 80, which forms a fiber-containing sheet S by bonding the fibers contained in the second sheet Wb2 together. Thus, the sheet manufacturing apparatus 100 can form a sheet S from the defiberized material formed in the defiberizing device 200.

[0106] Although the fiber-unwinding apparatus 200 and the sheet-making apparatus 100 according to the above embodiments of the present invention are based on the structures described above, it is of course possible to implement some structural modifications or omissions without departing from the scope of the spirit of the present invention. Furthermore, the above embodiments and other embodiments described below can be combined with each other without technical inconsistencies. Hereinafter, other embodiments will be described.

[0107] In the above embodiments, the fiber unwinding device 200 may also be arranged on the sheet manufacturing apparatus 100 in a posture where the axis AR is not horizontal. In this case, the fiber unwinding device 200 may also be arranged on the sheet manufacturing apparatus 100 with the discharge section 314 located at the lowermost position on the outer peripheral wall 351, and with the axis AR intersecting the horizontal direction and tilted.

[0108] In the above embodiments, the fiber unwinding device 200 may not be configured on the sheet manufacturing apparatus 100 with the discharge portion 314 and discharge pipe 30 vertically below the axis AR. For example, the fiber unwinding device 200 may be configured on the sheet manufacturing apparatus 100 with the discharge portion 314 and discharge pipe 30 vertically above the axis AR. Furthermore, for example, the fiber unwinding device 200 may be configured on the sheet manufacturing apparatus 100 with the discharge portion 314 and discharge pipe 30 arranged horizontally with respect to the axis AR.

[0109] In the above embodiment, the gap W between the outer peripheral wall 351 on the circumferential CR of the screen 221 and the screen 221 may also be made to gradually narrow from a position closer to the discharge portion 314 toward a position farther from the discharge portion 314. For example, it may be configured such that when the gap W of the region on the -Z direction side of the axis AR in the discharge channel 310 is set as gap W1 and the gap W of the region on the +Z direction side of the axis AR is set as a gap W3 that is wider than gap W1, the gap W of the region connecting the region on the -Z direction side of the axis AR and the region on the +Z direction side of the axis AR in the discharge channel 310 gradually narrows from the region on the +Z direction side of the axis AR toward the region on the -Z direction side of the axis AR. Alternatively, the interval W between the regions in the discharge channel 310 connected by the region on the -Z direction side of the axis AR and the region on the +Z direction side of the axis AR can be made to be a narrower interval than interval W3 and a wider interval than interval W1.

[0110] In the above embodiments, the following condition can also be used to prevent the discharge channel 310 from becoming a left-right symmetrical shape: the condition is that, as in... Figure 14When the discharge channel 310 is observed from the -Y direction side as shown, a clockwise airflow toward the discharge section 314 is generated in the region of the discharge channel 310 that becomes the discharge section 314 in the +X direction, and a counterclockwise airflow toward the discharge section 314 is generated in the region that becomes the discharge section 314 in the -X direction. In this case, for example, the intervals W2 and W4 can be different, or the region where the interval W is narrowest can be shifted from the position in the -Z direction, which becomes the axis AR, toward the X-axis direction. Furthermore, for example, the interval D between the sidewalls 352 and 353 can be different in the region that becomes the discharge section 314 in the +X direction and the region that becomes the discharge section 314 in the -X direction.

[0111] In the above embodiment, a fixing blade may also be provided in the area opposite the rotating blade 503 on the inner circumferential surface of the screen 221. The fixing blade defibers the raw material MA introduced between it and the rotating blade 503. In this case, the fixing blade may also be fixed to the inner circumferential surface of the screen 221 with a gap between it and the tip of the rotating blade 503. Figure 14 As shown, when viewed from the -Y direction side, the fixing blade may also have a sharp shape protruding from the screen 221 toward the rotating blade 503, and this fixing blade is a shape extending in the Y-axis direction. When multiple fixing blades are provided, they may be arranged such that they span the entire circumference of the screen 221 while being spaced apart in the circumferential direction CR. Alternatively, the fixing blades may be provided in the area of ​​the inner circumferential surface of the screen 221 that is opposite to the outer circumferential surface where the closing member 601 is provided.

[0112] In the above embodiment, the supply section 214 can be a through hole that penetrates the sidewall 212 in the Y-axis direction, and it does not have to be circular. For example, the supply section 214 can also be polygonal or elliptical, or it can be an arc shape centered on the axis AR.

[0113] In the above embodiment, the supply section 214 may not be opened at a position vertically above the axis AR in the side wall 212. For example, the supply section 214 may be opened at a position in the side wall 212 that is horizontally aligned with the axis AR.

[0114] In the above embodiment, the discharge portion 314 may also be circular when viewed from the Z-axis direction. Furthermore, the dimension of the opening edge portion 315 in the Y-axis direction may be different from the internal dimension of the discharge channel 310 in the Y-axis direction. In this case, for example, the dimension of the opening edge portion 315 in the Y-axis direction may be smaller compared to the internal dimension of the discharge channel 310 in the Y-axis direction.

[0115] In the above embodiment, the dimension of the closing member 601 in the Y-axis direction may also be different from the dimension of the discharge channel 310 in the Y-axis direction. For example, the dimension of the closing member 601 in the Y-axis direction may be smaller than the dimension of the discharge channel 310 in the Y-axis direction. Furthermore, the dimension of the closing member 601 in the X-axis direction may be the same as or smaller than the dimension of the opening edge portion 315 in the discharge portion 314. Additionally, the closing member 601 may not be rectangular. For example, the closing member 601 may be circular or elliptical.

[0116] In the above embodiments, the debonding device 200 may also omit the sealing member 601. In this case, the through holes 222 in the region RD may be provided in such a way that the number of through holes 222 provided per unit area in the screen 221 is reduced compared to the region ERD. Alternatively, the aforementioned fixing blade may be provided on the inner circumferential surface of the screen 221 corresponding to the region RD, thereby reducing the number of through holes 222 per unit area in the region RD that communicate between the debonding chamber 210 and the discharge channel 310 compared to the region ERD. Furthermore, the through holes 222 in the region RD may be provided in such a way that the number of through holes 222 provided per unit area in the screen 221 is the same as that in the region ERD. Furthermore, the through holes 222 in the region RD may be provided in such a way that the number of through holes 222 provided per unit area in the screen 221 is the same as that in the region RN.

[0117] Symbol Explanation

[0118] 2, 3, 7, 8, 54…pipe; 9…hopper; 10…feeding and receiving section; 12…coarse crushing section; 14…coarse crushing blade; 20…feeding pipe; 30…discharge pipe; 35…suction section; 40…screening section; 41…roller section; 42…inlet; 43…collection section; 44…discharge outlet; 45…first sheet forming section; 46…mesh belt; 47, 47a…supporting rollers; 48…suction section; 49…rotating body; 49a…base ; 49b…protrusion; 50…mixing section; 52…additive supply section; 52a…additive box; 56…mixing blower; 60…stacking section; 61…roller section; 63…collection section; 70…second sheet forming section; 72…mesh belt; 74…supporting roller; 76…suction mechanism; 78…humidification section; 79…conveying section; 79a…mesh belt; 79b…roller; 79c…suction mechanism; 80…sheet forming section; 82…additive… 84…Heating section; 85…Calendar roll; 86…Heating roll; 90…Cutting section; 92…First cutting section; 94…Second cutting section; 96…Discharge section; 100…Sheet manufacturing apparatus; 200…Fiber unwinding device; 210…Fiber unwinding chamber; 211…Fixing components; 212, 213…Side walls; 214…Supply section; 221…Screw; 222…Through hole; 310…Discharge channel; 311, 312, 3 13…shell; 314…discharge section; 315…opening edge; 351…outer peripheral wall; 352, 353…side walls; 401, 402…support section; 500…rotating body; 501…rotating shaft; 502…base; 503…rotating blade; 504…rotating vane; 601…closing component; F1…conveying direction; W1, W2, W3, W4…interval; Wb1…first material piece; Wb2…second material piece.

Claims

1. A defibrating apparatus comprising: a rotating body that rotates with a rotational axis as a center; a defibrating chamber that houses the rotating body and forms a defibrated product from a raw material containing fibers by rotation of the rotating body; a supply pipe that supplies the raw material to the defibrating chamber; a discharge passage that communicates with the defibrating chamber and discharges the defibrated product from the defibrating chamber; a discharge pipe to which a negative pressure is applied to discharge the defibrated product from the discharge passage; a discharge portion that communicates the discharge passage with the discharge pipe; a ring wall in a circular ring shape that is provided with a gap from the rotating body in a radial direction of the rotating body and defines the defibrating chamber; a housing that forms the discharge passage by surrounding an outer side of the ring wall in a circumferential direction; a plurality of through-holes that are provided in the ring wall and communicate the defibrating chamber with the discharge passage; an outer peripheral wall in a ring shape that is the outer peripheral wall of the housing and is provided with a gap from the ring wall in the radial direction, the discharge portion being provided in the outer peripheral wall and opening toward the ring wall, the gap between the outer peripheral wall and the ring wall gradually decreasing across the entire circumference of the ring wall as it moves away from the discharge portion in the circumferential direction of the ring wall, when a line segment that is orthogonal to the axis and links the axis and an opening edge portion of the discharge portion is set as an imaginary line segment LD, an area of the ring wall surrounded by the imaginary line segment LD is set as an area RD, an area of the ring wall other than the area RD is set as an area ERD, and the plurality of through-holes are set as the same shape and the through-holes that communicate the defibrating chamber with the discharge passage are set as communication holes, the number of the communication holes per unit area is smaller in the area RD than in the area ERD.

2. The defibrating apparatus according to claim 1, wherein the through-holes are distributed in the circumferential direction of the ring wall.

3. The defibrating apparatus according to claim 1, wherein the rotating body is housed in the defibrating chamber with the axis intersecting a vertical direction, and the discharge portion is provided at a lowermost position in the outer peripheral wall.

4. The defibrating apparatus according to claim 1, wherein when an area of the ring wall in which the gap from the outer peripheral wall is narrowest is set as an area RN, and an area of the ring wall other than the area RN is set as an area ERN, the number of the communication holes per unit area is larger in the area RN than in the area ERN.

5. The defibrating apparatus according to claim 1 or claim 4, wherein the communication holes are not provided in the area RD.

6. The defibrating apparatus according to claim 1, further comprising a side wall that defines the defibrating chamber, a support portion that supports the rotational axis and a supply portion that communicates the supply pipe with the defibrating chamber are provided in the side wall. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The supply portion is opened on the side wall at a position further from the discharge portion than the shaft center.

7. A fiber body manufacturing apparatus comprising: The defibrillation device according to any one of claims 1 to 6; A web forming portion that forms a web by piling the defibrated material discharged from the discharge pipe; A fiber body forming portion that forms a fiber body containing the fiber by bonding the fiber contained in the web together.

Images