Defibrating device, fiber body manufacturing device

Abstract

The present invention provides a defibration device and a fiber body manufacturing device. In a defibration device in which defibrated material is discharged into a discharge channel, there is a possibility that the defibrated material discharged into the discharge channel is retained on the inner side surface of the discharge channel. The defibration device (200) includes a screen (221) and a shell (311, 312, 313), and the side walls (352, 353) of the shell (311, 312, 313) have inner side surfaces (355, 356) that define the inner side surface of the discharge channel (310). The through hole (222) that connects the defibration chamber (210) and the discharge channel (310) is set as a connecting hole (Ch), and the discharge channel (310) of the through hole (222) is connected to the discharge channel (310). When the opening edge on the side is set as the discharge channel side opening edge (228), the screen (221) has a through hole row (224, 225), and the through hole row (224, 225) is formed by a plurality of connecting holes (Ch) arranged in a manner with a gap (Gh) in the circumferential direction (CR). The through hole row (224) is set at a position where the discharge channel side opening edge (228) of the connecting hole (Ch) overlaps with the inner side surface (355) when viewed from the radial direction (RR).

Description

Technical Field

[0001] The present invention relates to a defibration device and a fiber body manufacturing device. Background Art

[0002] Patent Document 1 discloses a defibration device that rotates a rotating body housed in a defibration chamber, thereby discharging defibrated material from raw material through a discharge channel. The discharge channel extends along the outside of an annular wall defining the defibration chamber. In this defibration device, the discharge channel communicates with the defibration chamber via a plurality of through-holes formed in the annular wall of the defibration chamber. Furthermore, defibrated material formed in the defibration chamber is passed through the through-holes by airflow and discharged into the discharge channel.

[0003] However, in the defibration device described in Patent Document 1, there is a possibility that the defibrated material discharged into the discharge passage may accumulate on the inner side surface of the discharge passage.

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

[0005] The defibration device comprises: a rotating body, which rotates with the axis of the rotating shaft as the center of rotation; a defibration chamber, which accommodates the rotating body and forms a defibrated material from the raw material containing fibers by the rotation of the rotating body; a discharge channel, which is connected to the defibration chamber and discharges the defibrated material from the defibration chamber; an annular ring wall, which is provided in a manner that leaves a gap with the rotating body in the radial direction of the rotating body and delimits the defibration chamber; a shell, which forms the discharge channel; a plurality of through holes, which are provided on the annular wall and penetrate the annular wall in the radial direction, and the discharge channel has a plurality of through holes in the axial direction along the axis. The shell has a width and extends in the circumferential direction of the annular wall. The shell has a side wall extending in the circumferential direction. The side wall has an inner side surface that defines the discharge channel. When the through hole that connects the defibration chamber and the discharge channel is set as a communicating hole, and the opening edge of the through hole on the discharge channel side is set as the discharge channel side opening edge, the annular wall has a communicating hole group, and the communicating hole group is formed by a plurality of communicating holes arranged in a manner with intervals in the circumferential direction. The communicating hole group is arranged at a position where the discharge channel side opening edge of the communicating hole overlaps with the inner side surface when viewed from the radial direction.

[0006] The fiber body manufacturing device comprises: the defibration device described above; a web forming unit that forms a web by piling up the defibrated material discharged from the defibration device; and a fiber body forming unit that forms a fiber body containing the fibers by bonding the fibers contained in the web together. BRIEF DESCRIPTION OF THE DRAWINGS

[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 the defibration device as one embodiment of the present disclosure as viewed from the -X direction side.

[0009] Figure 3 It is a side view showing the defibration device when viewed from the -Y direction side.

[0010] Figure 4 To express Figure 3 A cross-sectional view of the d4-d4 section is shown.

[0011] Figure 5 A three-dimensional diagram showing a rotating body.

[0012] Figure 6 This is a perspective view showing the defibration chamber with part of the screen removed.

[0013] Figure 7 It is a three-dimensional diagram showing the defibrination chamber.

[0014] Figure 8 To express Figure 7 An enlarged view of section s8 is shown.

[0015] Figure 9 This is a perspective view showing the defibration device with a portion of the housing removed.

[0016] Figure 10 It is a perspective view showing the defibration device.

[0017] Figure 11 To express Figure 2 A cross-sectional view of the d11-d11 section is shown.

[0018] Figure 12 To express from Figure 11 A cross-sectional view showing the state after the rotating body is removed.

[0019] Figure 13 It is a cross-sectional perspective view showing the periphery of the discharge portion.

[0020] Figure 14 It is a cross-sectional view showing the specifications of the discharge channel and the discharge portion.

[0021] Figure 15 This is a cross-sectional view showing the specifications of the discharge channel and the screen.

[0022] Figure 16 To express Figure 3 A cross-sectional view of section d16-d16 is shown.

[0023] Figure 17 This is a partial expanded view of the screen when viewed from the discharge channel side.

[0024] Figure 18 It is a partial expanded view showing another embodiment of the screen.

[0025] Figure 19 It is a partial expanded view showing another embodiment of the screen.

[0026] Figure 20 It is a partial expanded view showing another embodiment of the screen. DETAILED DESCRIPTION

[0027] Hereinafter, the present invention will be described based on the embodiments. The same symbols are marked on the same parts in each drawing, and repeated descriptions are omitted. In addition, in this specification, "same" not only means completely the same, but also includes the case where the same is taken into account under the condition of measurement error, the case where the same is taken into account under the condition of manufacturing deviation of the parts, and the case where the same is within the range that does not impair the function. Therefore, for example, "the dimensions of the two are the same" means that, taking into account measurement error and manufacturing deviation of the parts, the difference in size between the two is within ±10% of the size of one side, more preferably within ±5%, and particularly preferably within ±3%.

[0028] In addition, in each of the drawings, X, Y, and Z represent three spatial axes that are orthogonal to each other. In this specification, the directions along these axes are defined as the X-axis direction, the Y-axis direction, and the Z-axis direction. When determining the direction, the positive direction is defined as "+" and the negative direction is defined as "-", and both positive and negative symbols are used in the direction mark, and the direction pointed by the arrow mark in each drawing is defined as the + direction, and the opposite direction of the arrow mark is defined as the - direction for description. In addition, the Z-axis direction represents the direction of gravity, the +Z direction represents vertically downward, and the -Z direction represents vertically upward. In addition, the plane containing the X-axis and the Y-axis is defined as the XY plane, the plane containing the X-axis and the Z-axis is defined as the XZ plane, and the plane containing the Y-axis and the Z-axis is defined as the YZ plane for description. In addition, the XY plane becomes a horizontal plane. In addition, the three spatial axes of X, Y, and Z that are not limited to the positive and negative directions are described as the X-axis, the Y-axis, and the Z-axis.

[0029] 1. Implementation Method 1

[0030] The structure of the sheet manufacturing apparatus 100 according to Embodiment 1 will be described. The sheet manufacturing apparatus 100 performs a regeneration process of fiberizing a fiber-containing raw material MA and regenerating it into a new sheet S. The sheet manufacturing apparatus 100 is an example of a fibrous body manufacturing apparatus. The sheet S is an example of a fibrous body.

[0031] like Figure 1 As shown, the sheet manufacturing device 100 includes a storage and supply unit 10, a coarse crushing unit 12, a defibration device 200, a screening unit 40, a first sheet forming unit 45, a rotating body 49, a mixing unit 50, an accumulation unit 60, a second sheet forming unit 70, a conveying unit 79, a sheet forming unit 80 and a cutting unit 90.

[0032] The storage and supply unit 10 is an automatic feeding device that stores the raw material MA and continuously feeds the raw material MA into the crushing unit 12. The raw material MA only needs to be a material containing fibers, such as old paper, waste paper, or pulp flakes.

[0033] The crushing unit 12 includes a crushing blade 14 for cutting the raw material MA supplied from the storage and supply unit 10. The crushing blade 14 cuts the raw material MA into pieces several centimeters square in the air. A pulverizer, for example, can be used for the crushing unit 12. The raw material MA cut in the crushing unit 12 is collected by a hopper 9 and conveyed via a pipe 2 to a supply pipe 20 of the defibration device 200.

[0034] The coarse fragments are conveyed by airflow from the coarse crushing section 12 to the defibration device 200. In the defibration device 200, the coarse fragments are supplied from the supply pipe 20 to a defibration chamber 210 described later, and the coarse fragments are defibrated by rotating a rotating body 500 housed in the defibration chamber 210.

[0035] The tube 3 connected to the discharge pipe 30 is provided with a suction unit 35. The suction unit 35 includes a blower that applies negative pressure to the discharge pipe 30 by sucking air from the tube 3 on the discharge pipe 30 side. The defibrated material in the defibration chamber 210 is discharged from the defibration device 200 via the discharge passage 310 and the discharge pipe 30 (described later) due to the airflow generated by the negative pressure applied to the discharge pipe 30. The defibrated material discharged from the defibration device 200 is transferred to the screening unit 40 via the tube 3 connected to the discharge pipe 30. The structure of the defibration device 200 will be described later.

[0036] The screening unit 40 screens the components contained in the defibrated material according to the fiber size. The screening unit 40 includes a drum unit 41 and a storage unit 43 for storing the drum unit 41. The drum unit 41 is formed of a sieve, for example.

[0037] The defibrated material introduced into the drum portion 41 from the introduction port 42 is separated into the passed material that has passed through the opening of the drum portion 41 and the residual material that has not passed through the opening by the rotation of the drum portion 41. The first screened material, which is the passed material that has passed through the opening, falls toward the first web forming portion 45 in the storage portion 43.

[0038] Furthermore, the second screening material, which is the residue that has not passed through the opening, is conveyed again to the supply pipe 20 of the defibration device 200 from the discharge port 44 communicating with the interior of the drum portion 41 through the pipes 8 and 2 .

[0039] The first web forming unit 45 includes a mesh belt 46, suspension rollers 47 and 47a, and a suction unit 48. The mesh belt 46 is an endless belt, suspended on a plurality of suspension rollers 47 and 47a. The mesh belt 46 rotates around a track formed by the suspension rollers 47 and 47a. A portion of the track of the mesh belt 46 is flat below the roller unit 41, forming a flat surface. The suction unit 48 serves as a suction mechanism.

[0040] A plurality of openings are formed in the mesh belt 46. Components of the first screened material that are larger than the openings of the mesh belt 46 and that fall from the drum portion 41 located above the mesh belt 46 are deposited on the mesh belt 46. Furthermore, components of the first screened material that are smaller than the openings of the mesh belt 46 pass through the openings.

[0041] The suction unit 48 includes a blower (not shown) and sucks air from the side of the mesh belt 46 opposite the drum unit 41. Components that pass through the openings of the mesh belt 46 are sucked in by the suction unit 48. The airflow sucked in by the suction unit 48 has the effect of promoting accumulation of the first screened material falling from the drum unit 41 by bringing it closer to the mesh belt 46.

[0042] The components deposited on the mesh belt 46 are formed into webs, forming the first web Wb1. The mesh belt 46, the tension rollers 47 and 47a, and the suction unit 48 have the same basic structure as the mesh belt 72, the tension rollers 74, and the suction mechanism 76 of the second web forming unit 70 described later.

[0043] The first web Wb1 is conveyed to the rotating body 49 as the mesh belt 46 moves.

[0044] The rotating body 49 includes a base 49a connected to a driving unit (not shown) such as a motor, and a protrusion 49b protruding from the base 49a. When the base 49a is rotated in a direction D, the protrusion 49b rotates about the base 49a.

[0045] Rotating body 49 is located at the end of the flat portion of the mesh belt 46's track, on the side of the suspension roller 47a. Because the mesh belt 46's track bends downward at this end, the first web Wb1 conveyed by the mesh belt 46 protrudes from the mesh belt 46 and contacts the rotating body 49. The first web Wb1 collides with the protrusion 49b, breaking it up into smaller fiber chunks. These chunks pass through the pipe 7 located below the rotating body 49 and are conveyed to the mixing section 50.

[0046] The mixing unit 50 mixes the first sieved 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 sieved material and the additive, and a mixing blower 56.

[0047] The additive supply unit 52 supplies an additive composed of fine powder or fine particles in the additive cartridge 52 a to the tube 54 .

[0048] The additive supplied from the additive supply unit 52 contains a resin, ie, a binder, for bonding the plurality of fibers together. The resin contained in the additive melts when passing through the sheet forming unit 80, thereby bonding the plurality of fibers together.

[0049] The mixing blower 56 generates airflow in the pipe 54 connecting the pipe 7 and the accumulation unit 60. The first sieved material conveyed from the pipe 7 to the pipe 54 and the additive supplied to the pipe 54 by the additive supply unit 52 are mixed while passing through the mixing blower 56.

[0050] The accumulation unit 60 disintegrates the fibers of the mixture and causes the fibers to fall toward the second web forming unit 70 while being dispersed in the air.

[0051] The accumulation section 60 includes a drum section 61, an inlet 62 for introducing the mixture into the drum section 61, and a storage section 63 for storing the drum section 61. The drum section 61 is, for example, a cylindrical structure constructed in the same manner as the drum section 41, and is rotated by the power of a motor (not shown) like the drum section 41 to function as a sieve.

[0052] A second web forming unit 70 is disposed below the drum unit 61. The second web forming unit 70 includes, for example, a mesh belt 72, a tension roller 74, and a suction mechanism 76. The second web forming unit 70 is an example of a web forming unit.

[0053] Components larger than the opening of the mesh belt 72 in the mixture dropped from the roller portion 61 above the mesh belt 72 are deposited on the mesh belt 72. The components deposited on the mesh belt 72 are formed into webs, constituting second webs Wb2.

[0054] A humidity control section 78 is provided downstream of the accumulation section 60 in the conveyance path of the mesh belt 72. Since the moisture content of the second web Wb2 is adjusted by the moisture supplied by the humidity control section 78, it is expected that the adsorption of fibers to the mesh belt 72 due to static electricity can be suppressed.

[0055] The second web Wb2 is peeled off the mesh belt 72 by the conveyor unit 79 and conveyed to the sheet forming unit 80. The conveyor unit 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). The suction force of the blower passes through the mesh belt 79a and generates an upward airflow. This airflow peels the second web Wb2 from the mesh belt 72 and is attracted to the mesh belt 79a. The mesh belt 79a is moved by the rotation of the roller 79b, thereby conveying the second web Wb2 to the sheet forming unit 80.

[0056] The mesh belt 79 a can be formed of an endless belt having an opening similarly to the mesh belt 46 and the mesh belt 72 .

[0057] The sheet forming unit 80 applies heat to the second web Wb2 to thereby bond the fibers derived from the first screen contained in the second web Wb2 using the resin contained in the additive.

[0058] The sheet forming section 80 includes a pressurizing section 82 for pressurizing the second web Wb2, and a heating section 84 for heating the second web Wb2 pressurized by the pressurizing section 82. The pressurizing section 82 presses the second web Wb2 with a predetermined clamping force using a pair of calendering rollers 85 and conveys the second web Wb2 toward the heating section 84. The heating section 84 sandwiches the densified second web Wb2 using a pair of heating rollers 86 to apply heat and convey the densified second web Wb2 toward the cutting section 90. The second web Wb2 is heated in the heating section 84 by the resin contained in the second web Wb2, thereby forming a sheet S. The sheet forming section 80 is an example of a fiber body forming section.

[0059] The cutting unit 90 cuts the sheet S formed by the sheet forming unit 80. The cutting unit 90 includes a first cutting unit 92 and a second cutting unit 94. The first cutting unit 92 cuts the sheet S in a direction intersecting the conveying direction F1 of the sheet S, indicated by reference symbol F1 in the figure, and the second cutting unit 94 cuts the sheet S in a direction parallel to the conveying direction F1. The cutting unit 90 cuts the sheet S into predetermined lengths and widths, forming individual sheets S. The sheets S cut by the cutting unit 90 are stored in a discharge unit 96.

[0060] Next, the structure of the defibration device 200 will be described. The defibration device 200 is a device that processes raw material MA, which contains multiple fibers bound together, into a single fiber or a small number of fibers. The defibration device 200 is a dry-type defibration device that performs defibration and other processes in a gas, such as air, rather than in a liquid.

[0061] like Figures 2 to 5 As shown, the defibration device 200 includes a rotating body 500, a defibration chamber 210, a supply pipe 20, a discharge passage 310, and a discharge pipe 30. The defibration device 200 rotates the rotating body 500, which is housed in the defibration chamber 210, about the axis AR of the rotating shaft 501 as the rotation center, thereby forming a defibrated material from the raw material MA supplied via the supply pipe 20. Furthermore, the defibration device 200 includes a screen 221 that defines the defibration chamber 210, a fixing member 211, and side walls 212 and 213, a housing 311, 312, and 313 that defines the discharge passage 310, support portions 401 and 402 that support the rotating body 500, and a sealing member 601. In the following description, the rotation direction of the rotating shaft 501 about the axis AR may be referred to as the circumferential direction CR, and the radial direction of the rotating shaft 501 may be referred to as the radial direction RR.

[0062] The rotating body 500 has a rotating shaft 501, a base 502, a rotating blade 503 and a rotating blade 504. The rotating body 500 is housed in the defibration chamber 210 in such a manner that the axis AR of the rotating shaft 501 is along the Y-axis. Therefore, the rotating shaft 501 extends in the Y-axis direction. The Y-axis direction is an example of an axial direction. In other words, the defibration device 200 is arranged in the sheet manufacturing device 100 with the axis AR being horizontal. The base 502 is in the shape of a circular plate and is fixed in such a manner that the rotating shaft 501 is inserted therethrough. The rotating blade 503 is provided in such a manner as to protrude in the direction away from the base 502 in the radial direction RR. The rotating blade 503 is in the shape of a plate-shaped protrusion. A plurality of rotating blades 503 are formed in such a manner as to be spaced apart in the circumferential direction CR.

[0063] On the +Y direction side of the base 502, a plurality of rotating blades 504 are provided at intervals in the circumferential direction CR. Figure 5 As shown, in this embodiment, the rotating blade 503 and the base 502 are formed by laminating thin plates in the Y-axis direction, but they may be formed by an integrally shaped block.

[0064] like Figure 4 、 Figure 6 As shown in FIG, the fixing member 211 has a cylindrical shape and is located on the +Y direction side of the rotating blade 503 in the Y-axis direction.

[0065] like Figure 4 、 Figure 10 、 Figure 12 As shown, the side wall 212 is disk-shaped. It is located on the +Y side of the fixing member 211. By being fixed to the fixing member 211, the side wall 212 defines the inner side of the defibrination chamber 210 on the +Y side. The side wall 212 is provided with the support portion 401, the supply pipe 20, and the supply portion 214.

[0066] 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 blade 503 of the rotating body 500. The support portion 401 supports the rotating shaft 501 of the rotating body 500 so that the rotating body 500 can rotate about the axis AR. The support portion 401 supports the rotating shaft 501 of the rotating body 500 on the +Y direction side relative to the rotating blade 503.

[0067] The rotating shaft 501 is driven to rotate by a driving mechanism (not shown). In this embodiment, the driving mechanism is composed of a belt and a pulley, and a rotation driving source (not shown) transmits power to the belt and the pulley, thereby rotating the rotating body 500 with the axis AR as the rotation center. Although in this embodiment, the rotating body 500 is Figure 11 The rotating body 500 rotates counterclockwise with the axis AR as the rotation center, but it can also rotate clockwise. Figure 11 The rotating shaft 501 rotates in two directions, clockwise and counterclockwise, with the axis AR being the rotation center. In addition, the structure for rotationally driving the rotating shaft 501 may not be a structure composed of a belt and a pulley.

[0068] The supply pipe 20 supplies the fiber-containing raw material MA to the defibrination chamber 210. Figure 4 、 Figure 6 、 Figure 12 As shown, the supply pipe 20 is tubular. The supply pipe 20 is provided on the surface on the +Y direction side of the side wall 212. The supply pipe 20 is provided on the side wall 212 at a position in the -Z direction of the axis AR of the rotating shaft 501. The supply pipe 20 extends in the Y-axis direction. The supply portion 214 is a circular through hole that passes through the side wall 212 in the Y-axis direction. The supply portion 214 connects the supply pipe 20 with the defibrination chamber 210. Therefore, the supply portion 214 opens on the side wall 212 at a position vertically above the axis AR of the rotating shaft 501, that is, in the -Z direction. In other words, the supply portion 214 opens at a position on the side wall 212 that is farther away from the discharge portion 314 described later than the axis AR.

[0069] like Figure 4 、 Figure 6 、 Figure 10As shown, the side wall 213 is disk-shaped. It is located on the -Y side of the fixed member 211. Furthermore, the side wall 213 is located on the -Y side of the rotating blade 503 of the rotating body 500. The side wall 213 is fixed to the fixed member 211 via the screen 221, thereby defining the inner side surface of the defibrination chamber 210 on the -Y side. The side wall 213 is provided with a support portion 402 that supports the rotating shaft 501 of the rotating body 500 on the -Y side relative to the rotating blade 503.

[0070] like Figure 4 、 Figures 6 to 9 、 Figures 11 to 14 As shown, the screen 221 is in the form 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 an annular shape by being fixed to the fixing member 211 and the side wall 213. The screen 221 is arranged so as to leave a gap with the rotating blade 503 in the radial direction RR.

[0071] The width of the screen 221 in the Y-axis direction is larger than the Y-axis dimension of the rotating blade 503. In the Y-axis direction, the tip of the rotating blade 503 is located within the width of the screen 221. The screen 221 is fixed to the fixing member 211 and the side wall 213, thereby defining the inner circumference of the cylindrical defibration chamber 210. The screen 221 defines the area of ​​the inner circumference of the defibration chamber 210 that faces the tip of the rotating blade 503. The screen 221 is an example of an annular wall.

[0072] The mesh 221 is formed of, for example, a metal thin plate member. The mesh 221 of this embodiment is formed into an annular shape by fixing a plurality of thin plate members to the fixing member 211 and the side wall 213 in a manner arranged along the circumferential direction CR. As the metal material, stainless steel can be used, for example.

[0073] like Figure 4 、 Figures 9 to 14 As shown, housings 311, 312, and 313 are arranged to surround the outside of screen 221 in the circumferential direction CR. By covering the outside of screen 221 across the entire circumference CR, housings 311, 312, and 313 form discharge passage 310. Housings 311, 312, and 313 are fixed to fixing member 211 and sidewall 213, with screen 221 sandwiched between them and fixing member 211 and between them and sidewall 213. In this case, sidewall 213 can be considered an example of a fixing member that secures screen 221.

[0074] Housings 311, 312, and 313 include an outer peripheral wall 351, a side wall 352, and a side wall 353. Outer peripheral wall 351 is disposed with a spacing W between it and screen 221 in the radial direction RR. Outer peripheral wall 351 is annular. The spacing W between outer peripheral wall 351 and screen 221 in the radial direction RR represents the inner dimension of discharge passage 310 in the radial direction RR.

[0075] 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 extends in the circumferential direction CR. The side wall 352 has an inner side surface 355, which defines the inner side 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 extends in the circumferential direction CR. The side wall 353 has an inner side surface 356, which defines the inner side surface of the discharge channel 310 on the -Y direction side. In addition, the distance D between the inner side surface 355 and the inner side surface 356 in the Y-axis direction is the width dimension of the discharge channel 310 in the Y-axis direction. The discharge channel 310 of this embodiment is formed into an annular shape by fixing the screen 221 to the fixing member 211 and the side wall 213 in a manner such that the three shells 311, 312, and 313 are arranged along the circumferential direction CR.

[0076] like Figure 4 、 Figures 11 to 14 As shown, the discharge channel 310 is provided outside the screen 221 so as to span the entire circumference in the circumferential direction CR. The discharge channel 310 has a width in the Y-axis direction and extends in the circumferential direction CR of the screen 221. The discharge channel 310 communicates with the defibration chamber 210 via a plurality of through-holes 222 provided in the screen 221. The defibrated material formed in the defibration chamber 210 is discharged into the discharge channel 310 via the plurality of through-holes 222. Alternatively, the discharge channel 310 may be formed by a single housing member.

[0077] The outer peripheral wall 351 of the housing 311 is provided with a discharge pipe 30 and a discharge portion 314. The discharge pipe 30 is provided 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, which is vertically below the axis AR of the rotation axis 501. Therefore, the discharge pipe 30 is provided at the lowest position on the outer peripheral wall 351. The discharge pipe 30 is tubular in shape and extends from the outer peripheral wall 351 in the +Z direction.

[0078] The discharge portion 314 is a through hole that passes through the outer peripheral wall 351 in the Z-axis direction. The discharge portion 314 has a roughly quadrilateral shape when viewed from the Z-axis direction. The opening edge portion 315 is the edge of the discharge portion 314 opening on the discharge channel 310 side. The dimension of the opening edge portion 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 portion 315 in the X-axis direction is set to 40 mm to 50 mm. The dimension of the discharge portion 314 in the Y-axis direction is the same as the internal dimension of the discharge channel 310 in the Y-axis direction.

[0079] The discharge portion 314 connects the discharge passage 310 and the discharge pipe 30. The discharge portion 314 is provided on the outer peripheral wall 351 and opens toward the screen 221. Therefore, the discharge portion 314 is provided on the outer peripheral wall 351 at a position vertically below the axis AR of the rotation shaft 501, that is, in the +Z direction. In other words, the discharge portion 314 is provided at the lowest position on the outer peripheral wall 351.

[0080] In this embodiment, the distance D between the side walls 352 and 353 is constant over the entire circumference of the screen 221. The distance D is set to a predetermined size of, for example, 40 mm to 50 mm. Meanwhile, the distance W between the outer peripheral wall 351 and the screen 221 is narrower in the circumferential direction CR of the screen 221, as it moves away from the area facing the discharge portion 314, compared to the area facing the discharge portion 314.

[0081] For example, Figure 14 As shown, the spacing W between the areas in the -Z direction relative to the axis AR in the discharge channel 310 is defined as spacing W1, the spacing W between the areas in the +X direction relative to the axis AR is defined as spacing W2, the spacing W between the areas in the +Z direction relative to the axis AR is defined as spacing W3, and the spacing W between the areas in the -X direction relative to the axis AR is defined as spacing W4. In this case, spacing W1 is narrower than spacing W3. Furthermore, spacing W2 and spacing W4 are narrower than spacing W3. Furthermore, spacing W1 is narrower than spacing W2 and spacing W4. In this embodiment, spacing W2 and spacing W4 are the same.

[0082] Furthermore, in this embodiment, the spacing W gradually decreases as it moves away from the discharge portion 314 in the circumferential direction CR of the mesh 221. Furthermore, the spacing D between the side walls 352 and 353 is constant across the entire circumference of the mesh 221. Therefore, the flow channel cross-sectional area of ​​the discharge passage 310 gradually decreases as it moves away from the discharge portion 314 in the circumferential direction CR of the mesh 221. Furthermore, in this embodiment, for example, the spacing W1 is set to 5 mm, the spacing W2 and spacing W4 are set to 10 mm, and the spacing W3 is set to 15 mm.

[0083] like Figure 8 As shown, a plurality of through holes 222 are formed on the screen 221, which pass through the screen 221 in the radial direction RR which becomes the thickness direction. In this embodiment, the plurality of through holes 222 are of the same shape. The through holes 222 of this embodiment are circular holes. The aperture of the through holes 222 is set to a size that can be passed through by the defibrated material that has been defibrated to the desired degree. The screen 221 can also be formed by forming the through holes 222 on a thin plate member using punching, etching, cutting, etc. In addition, the screen 221 can also be composed of a thin plate member.

[0084] like Figure 7 、 Figure 8 、 Figure 11 、 Figure 16 、 Figure 17 As shown, the plurality of through holes 222 are provided in a distributed manner in the circumferential direction CR of the mesh 221 . Figure 17 In order to explain the arrangement of the plurality of through holes 222, the annular screen 221 is unfolded into a flat plate as viewed from the discharge channel 310 side. Figure 17 This corresponds to the state when the annular screen 221 is observed from the radial direction RR. Figure 17 The Y-axis direction and the circumferential direction CR shown correspond to the Y-axis direction and the circumferential direction CR when the screen 221 is fixed to the fixing member 211 and the side wall 213 to define the defibrination chamber 210. Figure 17 In FIG. 3 , the positions of the inner side surfaces 355 and 356 when the outer side of the screen 221 is covered by the shells 311, 312, and 313 to form the discharge channel 310 are indicated by double-dashed lines. Figures 18 to 20 The same setting applies to .

[0085] like Figure 17 As shown, the mesh 221 is provided with a plurality of through-hole rows 223 at a uniform center-to-center spacing Py in the Y-axis direction. These through-hole rows 223 are formed by through-holes 222 having a hole diameter of φWh arranged at intervals Gh in the circumferential direction CR. In other words, the mesh 221 is provided with a plurality of through-hole rows 223 at a uniform center-to-center spacing (Py-Wh) in the Y-axis direction. These through-hole rows 223 are formed by through-holes 222 having a hole diameter of φWh arranged at intervals Gh in the circumferential direction CR.

[0086] Furthermore, a pair of through-hole rows 224 and 225 are provided on the screen 221, corresponding to the positions of the inner surfaces 355 and 356. In this embodiment, the through-hole rows 224 and 225 are formed by arranging through-holes 222 having a hole diameter of φWh with a spacing Gh in the circumferential direction CR. Furthermore, the through-hole rows 224 and 225 are arranged so as to have the same center-to-center spacing Py as the adjacent through-hole row 223 in the Y-axis direction. As a result, the center-to-center spacing Iy between the through-hole rows 224 and 225 becomes an integer multiple of the center-to-center spacing Py. Therefore, the through-hole rows 224 and 225 are included in the plurality of through-hole rows 223.

[0087] In this embodiment, the through-holes 222 are offset in the circumferential direction CR relative to the other through-holes 222 formed in the through-hole rows 223 adjacent in the Y-axis direction. That is, the plurality of through-holes 222 are arranged in a so-called staggered pattern on the mesh 221. In this embodiment, the through-holes 222 are offset in the circumferential direction CR relative to the other through-holes 222 formed in the through-hole rows 223 adjacent in the Y-axis direction by half the center-to-center distance (Gh+Wh).

[0088] The aperture Wh of through-holes 222 is preferably not less than φ0.3 mm and not more than φ2.0 mm. Furthermore, the spacing Gh between adjacent through-holes 222 is preferably from the same dimension as the thickness of the mesh 221 to twice the aperture Wh of the through-hole 222, and more preferably from half the aperture Wh of the through-hole 222 to twice the aperture Wh. The spacing Gh between adjacent through-holes 222 is the dimension of the remaining wall portion of the mesh 221 that forms the shortest distance between the opening edges of adjacent through-holes 222.

[0089] In this embodiment, the through-holes 222 have a hole diameter φWh and a center-to-center spacing Py between adjacent through-hole rows 223, so that the spacing between the other six through-holes 222 surrounding the through-hole 222 is the same as the spacing Gh between other adjacent through-holes 222 in the circumferential direction CR. For example, the hole diameter Wh of the through-holes 222 is set to φ0.6 mm, and the center-to-center spacing Py between adjacent through-hole rows 223 in the circumferential direction CR is set to 1.5 mm. In this case, the spacing Gh between adjacent through-holes 222 is Gh = 2 / (3^0.5) * Py - Wh = 1.1 mm. Alternatively, the spacing Gh between adjacent through-holes 222 is Gh = (3^0.5) * Py - Wh = 2.0 mm. Furthermore, when there are 29 through-hole rows 223 arranged in the Y-axis direction, including through-hole rows 224 and 225, the center-to-center spacing Iy between through-hole rows 224 and 225 is 42 mm.

[0090] The opening edge of the through hole 222 on the discharge channel 310 side is set as the discharge channel side opening edge 228. At this time, the through hole array 224 is set at a position where the discharge channel side opening edge 228 of the through hole 222 forming the through hole array 224 overlaps with the inner side surface 355 when viewed from the radial direction RR. In addition, the through hole array 225 is set at a position where the discharge channel side opening edge 228 of the through hole 222 forming the through hole array 225 overlaps with the inner side surface 356 when viewed from the radial direction RR. In addition, as Figure 16 As shown, the fixing member 211 is located on the +Y side relative to the inner surface 355 and the through-hole array 224 in the Y-axis direction. The side wall 213 is located on the −Y side relative to the inner surface 356 and the through-hole array 225 in the Y-axis direction.

[0091] Therefore, when the through-holes 222 connecting the defibrination chamber 210 and the discharge channel 310 are defined as the communication holes Ch, the through-hole row 224 is positioned so that the discharge channel-side opening edge 228 of the communication holes Ch forming the through-hole row 224 overlaps with the inner side surface 355 when viewed from the radial direction RR. Furthermore, the through-hole row 225 is positioned so that the discharge channel-side opening edge 228 of the communication holes Ch forming the through-hole row 225 overlaps with the inner side surface 356 when viewed from the radial direction RR. The through-hole rows 224 and 225 are an example of a pair of communication hole groups. Furthermore, the through-hole row 224 is an example of one communication hole group, and the through-hole row 225 is an example of the other communication hole group.

[0092] exist Figure 17 , the figure shows a case where the discharge channel-side opening edge 228 of through-hole 222 in through-hole row 224 is in contact with inner side surface 355 on the +Y direction side, and the discharge channel-side opening edge 228 of through-hole 222 in through-hole row 225 is in contact with inner side surface 356 on the -Y direction side. In this case, for through-holes 222 in through-hole rows 224 and 225, the ratio of the opening area of ​​through-hole 222 opening into discharge channel 310 to the opening area of ​​through-hole 222 opening toward discharge channel 310 is 100%. Furthermore, taking into account manufacturing variations in components such as screen 221 and housings 311, 312, and 313, as well as positional variations of housings 311, 312, and 313 relative to screen 221, the distance D between inner side surface 355 and inner side surface 356 is set to satisfy the relationship Iy-Wh<D≤Iy+Wh.

[0093] The ratio of the opening area of ​​the through hole 222 opening in the discharge channel 310 to the opening area of ​​the through hole 222 opening on the discharge channel 310 side is preferably 50% or more, more preferably 80% or more. Figure 16As shown, the housings 311, 312, and 313 are fixed to the fixing member 211 and the sidewall 213 in a state where they cover the screen 221. Furthermore, the housings 311, 312, and 313 are fixed to the fixing member 211 and the sidewall 213 with the screen 221 sandwiched between them and the fixing member 211 and between them and the sidewall 213. Furthermore, the housings 311, 312, and 313 are fixed to the fixing member 211 and the sidewall 213 by inserting fixing screws (not shown) into screw holes 361 provided in the housings 311, 312, and 313 and tightening the fixing screws.

[0094] For example, when fixing the housing 312 to the fixing member 211 and the side wall 213, first, the housing 312 is placed in a position to cover the screen 221. At this time, the screen 221 is fixed to the fixing member 211 and the side wall 213. The dimension in the Y-axis direction, which is the width dimension of the screen 221, is larger than the distance D between the inner side surface 355 and the inner side surface 356. Therefore, as shown in FIG. Figure 16 As indicated by the white hollow arrow in FIG. 3 , the housing 312 can be moved relative to the mesh 221 in the Y-axis direction while covering the mesh 221 .

[0095] Furthermore, the housing 312 can be moved relative to the screen 221 in the Y-axis direction, with the screen 221 sandwiched between the housing 312 and the fixing member 211 and between the housing 312 and the side wall 213. Therefore, the housing 312 can be adjusted to a position where the inner side surface 355 overlaps with the discharge channel-side opening edge 228 of the through-hole array 224 provided in the screen 221, and the inner side surface 356 overlaps with the discharge channel-side opening edge 228 of the through-hole array 225.

[0096] Furthermore, the size of the screw hole 361 is set larger than the thread diameter of the fixing screw so that the housing 312 can be tightened and fixed to the fixing member 211 and the side wall 213 using the fixing screw while the position of the housing 312 is adjusted relative to the screen 221. Therefore, in this embodiment, the housing 312 can be fixed to the fixing member 211 and the side wall 213 while the position of the housing 312 is adjusted relative to the screen 221.

[0097] In addition, although in this embodiment, it can be said that a plurality of through-hole rows formed by arranging the through-holes 222 in the Y-axis direction are provided across the entire circumference of the screen 221 with the same intervals Gh in the circumferential direction CR, it is also possible to provide a plurality of through-hole rows formed by arranging the through-holes 222 in the Y-axis direction with different intervals in the circumferential direction CR across the entire circumference of the screen 221. Alternatively, a through-hole group formed by arranging the through-holes 222 in the Y-axis direction and the circumferential direction CR with the same intervals in the circumferential direction CR across the entire circumference of the screen 221. Furthermore, in this embodiment, a through-hole row is formed by arranging the same number of through-holes 222 in the Y-axis direction, but the number of through-holes forming the through-hole row may vary between through-hole rows.

[0098] When the through-holes 222 are formed in the thin plate member by etching, the material of the thin plate member may be, for example, SUS430, SUS304, SUS316L, etc. Alternatively, the mesh 221 may be a net formed by weaving metal wires. In this case, the mesh openings of the net correspond to the through-holes 222.

[0099] like Figure 4 、 Figures 11 to 14 As shown, the closing member 601 is provided on the outer peripheral surface of the screen 221 on the discharge channel 310 side. The closing member 601 is provided in the opposite region of the screen 221 to the discharge portion 314. The closing member 601 is located on the +Z direction side of the axis AR. The closing member 601 covers the outer peripheral surface of the screen 221 on the discharge channel 310 side, thereby closing the opening of the through hole 222 on the discharge channel 310 side. The closing member 601 closes the through hole 222 provided in the region near the discharge portion 314 of the screen 221. Alternatively, the closing member 601 may be provided on the inner peripheral surface of the screen 221 on the defibrination chamber 210 side. In this case, the closing member 601 covers the inner peripheral surface of the screen 221 on the defibrination chamber 210 side, thereby closing the opening of the through hole 222 on the defibrination chamber 210 side.

[0100] In this embodiment, the Y-axis dimension of the sealing member 601 is the same as the Y-axis dimension of the discharge passage 310. The X-axis dimension of the sealing member 601 is larger than the X-axis dimension of the opening edge portion 315 of the discharge portion 314.

[0101] In addition, if Figure 14As shown, the angle formed between the line segment connecting the axis AR and the +X direction end of the closing component 601 and the line segment connecting the axis AR and the +X direction end of the opening edge portion 315 is θ. In addition, the angle formed between the line segment connecting the axis AR and the -X direction end of the closing component 601 and the line segment connecting the axis AR and the -X direction end of the opening edge portion 315 is θ. Therefore, the position of the +X direction end of the closing component 601 is offset toward the +X direction side by the amount of angle θ relative to the position of the +X direction end of the opening edge portion 315. In addition, the position of the -X direction end of the closing component 601 is offset toward the -X direction side by the amount of angle θ relative to the position of the -X direction end of the opening edge portion 315. In this embodiment, the angle θ is set to, for example, 5° to 15°.

[0102] The through-holes 222 provided in the area of ​​the screen 221 whose outer circumference is covered by the sealing member 601 do not connect the defibrination chamber 210 and the discharge passage 310. In other words, no communication holes Ch are provided in the area of ​​the screen 221 whose outer circumference is covered by the sealing member 601. Furthermore, in this embodiment, no communication holes Ch are provided in the area of ​​the screen 221 between the center of the discharge portion 314 in the Z-axis direction and the rotation axis 501.

[0103] Furthermore, when the projection line segment, perpendicular to the axis AR and connecting the axis AR and the center of the discharge portion 314, is defined as a projection line segment, and the direction along the projection line segment is defined as a projection direction, and the opening edge portion 315 of the discharge portion 314 is projected onto the mesh 221, in this embodiment, no communication holes Ch are provided in the area surrounded by the opening edge portion 315 projected onto the mesh 221. Furthermore, in this embodiment, the projection direction is defined as a direction along the Z-axis. Furthermore, the area surrounded by the opening edge portion 315 projected onto the mesh 221 is an example of an opposing area of ​​the mesh 221 that the discharge portion 314 faces.

[0104] Furthermore, assuming that a line segment perpendicular to the axis AR and connecting the axis AR and the opening edge 315 of the discharge portion 314 is an imaginary line segment LD, and that the region of the screen 221 enclosed by the imaginary line segment LD is a region RD, in this embodiment, no communicating holes Ch are provided in the region RD. The region RD is an example of a region of the screen 221 that faces the discharge portion 314.

[0105] As a result, when the area other than the area RD in the mesh 221 is designated as the area ERD (not shown), the number of communicating holes Ch provided per unit area in the area RD is smaller than that in the area ERD. Furthermore, when the area in the mesh 221 where the interval W with the outer peripheral wall 351 is the narrowest, the interval W1, is designated as the area RN, and the area other than the area RN in the mesh 221 is designated as the area ERN (not shown), the number of communicating holes Ch provided per unit area in the area RN is larger than that in the area ERN.

[0106] Furthermore, the number of communicating holes Ch provided per unit area in region RN is greater than that in region RD. Furthermore, in this embodiment, region RN and the region of discharge passage 310 where interval W is the narrowest, interval W1, are located on the -Z direction side, vertically above axis AR. Therefore, region RN is an example of a region of screen 221 that is farthest from discharge portion 314 in circumferential direction CR.

[0107] In addition, although in the present embodiment, the outer peripheral surface of the screen 221 is covered by the closing component 601, thereby forming an area on the screen 221 where no through-holes 222 for connecting the defibration chamber 210 and the discharge channel 310 are provided, it is also possible to form an area on the screen 221 where no through-holes 222 for connecting the defibration chamber 210 and the discharge channel 310 are provided by not forming the through-holes 222 in the area where the outer peripheral surface of the screen 221 is covered by the closing component 601 in the present embodiment.

[0108] Next, the operation of the defibration device 200 will be described. The defibration device 200 introduces the material MA supplied to the defibration chamber 210 into the gap between the rotating blades 503 of the rotating body 500 and the screen 221 by airflow, and performs dry defibration on the material MA.

[0109] In this embodiment, if Figure 4 As shown, the raw material MA fed from the supply pipe 20 of the defibration device 200 is introduced into the defibration chamber 210 through the supply portion 214. In the defibration chamber 210, the rotating body 500 is rotated by rotating the rotating shaft 501. In addition, a negative pressure generated by the suction portion 35 is applied to the discharge channel 310 via the discharge pipe 30. As a result, in the defibration chamber 210, the discharge channel 310 and the discharge pipe 30, the Figure 4 Airflow is generated as indicated by the dotted arrows.

[0110] This airflow transports the material MA into the gap between the tip of the rotating blade 503 and the screen 221. The material MA transported into this gap is caused to fly by centrifugal force from the rotating body 500 and collides with the screen 221, breaking it apart and defibrating it. That is, the material MA is defibrated in the defibration chamber 210, producing a defibrated product.

[0111] The defibrated material produced in the defibration chamber 210 passes through the through-holes 222 of the screen 221 due to the airflow and flows into the discharge passage 310. The defibrated material flowing into the discharge passage 310 passes through the discharge portion 314 due to the airflow, moves to the discharge pipe 30, and is discharged into the pipe 3 connected to the discharge pipe 30. This airflow that moves the defibrated material is generated by the pressure difference between the negative pressure applied to the discharge pipe 30 by the suction portion 35 and the pressure within the discharge portion 314, the discharge passage 310, and the defibration chamber 210 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 portion 35 acting on the discharge passage 310 and the pressure in the defibration chamber 210.

[0112] In the discharge channel 310, it is more difficult to ensure airflow near the inner side surfaces of the discharge channel 310 defined by the inner side surfaces 355 and 356 of the housings 311, 312, and 313 than near the center of the discharge channel 310 in the Y-axis direction. Therefore, there is a possibility that the defibrated material discharged from the defibrination chamber 210 into the discharge channel 310 will accumulate near the inner side surfaces of the discharge channel 310.

[0113] In this embodiment, in the screen 221, the through-hole array 224 is arranged so that the discharge channel-side opening edge 228 of the communication holes Ch forming the through-hole array 224 overlaps with the inner side surface 355 when viewed from the radial direction RR. This facilitates airflow along the inner side surface 355, thereby suppressing the accumulation of defibrated material near the inner side surface 355. Furthermore, the through-hole array 225 is arranged so that the discharge channel-side opening edge 228 of the communication holes Ch forming the through-hole array 225 overlaps with the inner side surface 356 when viewed from the radial direction RR. This facilitates airflow along the inner side surface 356, thereby suppressing the accumulation of defibrated material near the inner side surface 356.

[0114] Furthermore, in the discharge passage 310, the negative pressure generated by the suction unit 35 tends to act on the area near the discharge portion 314. This tends to increase the flow rate of air passing from the defibration chamber 210 toward the discharge passage 310 through the through-holes 222 provided in the area near the discharge portion 314. Furthermore, the flow rate of air passing from the defibration chamber 210 toward the discharge passage 310 through the through-holes 222 provided in the area near the discharge portion 314 tends to increase. In this case, undefibrated material that has not been fully defibrated in the through-holes 222 provided in the area near the discharge portion 314 may be discharged into the discharge passage 310. Furthermore, there is a possibility that the through-holes 222 may be clogged with defibration material.

[0115] Furthermore, when the flow rate of air passing from the defibration chamber 210 toward the discharge passage 310 through the through-holes 222 provided in the area near the discharge portion 314 is high, the negative pressure generated by the suction unit 35 is less likely to act on areas farther from the discharge portion 314. Consequently, the velocity of the airflow passing from the defibration chamber 210 toward the discharge passage 310 is likely to decrease in the through-holes 222 provided in areas farther from the discharge portion 314. In areas where the velocity of air passing through the through-holes 222 of the screen 221 is low, it is difficult for defibrated material to pass through the through-holes 222. As a result, the amount of defibrated material that remains in the defibration chamber 210 for a longer time, resulting in an increase in the amount of defibrated material that is excessively defibrated.

[0116] In this embodiment, for example, Figure 15 As shown, the area of ​​the discharge channel 310 including the discharge portion 314 is designated as the downstream discharge channel 310D, which is close to the discharge portion 314, and the area other than the downstream discharge channel is designated as the upstream discharge channel 310U, which is farther from the discharge portion 314. Furthermore, the area of ​​the screen 221 that constitutes the downstream discharge channel 310D is designated as the downstream screen 221D, and the area that constitutes the upstream discharge channel 310U is designated as the upstream screen 221U. Furthermore, when the through-holes 222 that connect the defibrination chamber 210 and the discharge channel 310 are designated as the communication holes Ch, the number of communication holes Ch provided per unit area of ​​the downstream screen 221D is smaller than that of the upstream screen 221U.

[0117] In other words, when comparing the downstream screen 221D and the upstream screen 221U, each having the same area, the communicating holes Ch are provided in the screen 221 so that air is less likely to pass through the downstream screen 221D than through the upstream screen 221U. Furthermore, in this embodiment, when the closure member 601 is provided, the downstream exhaust passage 310D is the region encompassing the region RD, the closure member 601, and the exhaust portion 314, while the upstream exhaust passage 310U is the region encompassing the region RN but excluding the closure member 601 and the exhaust portion 314. The downstream screen 221D is an example of a downstream annular wall, and the upstream screen 221U is an example of an upstream annular wall.

[0118] This arrangement reduces the flow rate of air passing through the through-holes 222 of the downstream screen 221D from the defibration chamber 210 toward the discharge passage 310, compared to a case where the number of communication holes Ch per unit area is the same throughout the entire circumference of the screen 221. Furthermore, it facilitates the negative pressure generated by the suction unit 35 to act on the upstream discharge passage 310U. Furthermore, it facilitates increasing the flow rate of air passing through the through-holes 222 of the upstream screen 221U from the defibration chamber 210 toward the discharge passage 310. As a result, it reduces the amount of inadequately defibrated material discharged from the through-holes 222 of the downstream screen 221D into the discharge passage 310. Furthermore, it reduces the amount of over-defibrated material that has been excessively defibrated. Furthermore, it facilitates ensuring airflow along the inner surface of the upstream discharge passage 310U, thereby preventing defibrated material discharged into the upstream discharge passage 310U from accumulating near the inner surfaces 355 and 356.

[0119] Furthermore, the pressure difference between the downstream discharge passage 310D and the upstream discharge passage 310U can be easily reduced. Furthermore, the speed difference between the airflow passing through the through-holes 222 of the downstream screen 221D and the airflow passing through the through-holes 222 of the upstream screen 221U can be easily reduced. Consequently, the defibration deviation of the defibrated material discharged into the discharge passage 310 can be reduced. Furthermore, the defibrated material discharged into the upstream discharge passage 310U can be prevented from accumulating near the inner surfaces 355 and 356.

[0120] In addition, in this embodiment, if Figure 11As shown, the discharge channel 310 is arranged so as to cover the entire perimeter of the outside of the screen 221. Furthermore, the 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 toward the screen 221. This facilitates the negative pressure generated by the suction portion 35 to act on the upstream side of the discharge channel 310, farther from the discharge portion 314. This prevents over-defibrated defibrated material from being discharged into areas of the screen 221 farther from the discharge portion 314, thereby reducing the degree of defibration of the defibrated material discharged into the discharge channel 310.

[0121] In addition, if Figure 11 As indicated by the dashed arrows in the figure, a clockwise airflow toward the discharge portion 314 can be generated in the region of the discharge passage 310 located on the +X direction side relative to the axis AR, while a counterclockwise airflow toward the discharge portion 314 can be generated in the region located on the -X direction side relative to the axis AR. Furthermore, in this case, both clockwise and counterclockwise airflow toward the discharge portion 314 can be generated in the region of the discharge passage 310 located farthest from the discharge portion 314 and located on the -Z direction side vertically above the axis AR.

[0122] As described above, according to the defibrating device 200 and the sheet manufacturing apparatus 100 according to the first embodiment, the following effects can be obtained.

[0123] The defibration device 200 includes: a rotating body 500 that rotates about an axis AR of a rotating shaft 501; a defibration chamber 210 that accommodates the rotating body 500 and, as the rotating body 500 rotates, forms a defibrated material from a fiber-containing raw material MA; a discharge channel 310 that communicates with the defibration chamber 210 and discharges the defibrated material from the defibration chamber 210; an annular screen 221 disposed with a gap between the rotating body 500 and the rotating body 500 in a radial direction RR, defining the defibration chamber 210; housings 311, 312, and 313 that form the discharge channel 310; and a plurality of through-holes 222 provided in the screen 221 and extending through the screen 221 in the radial direction RR. The discharge channel 310 has a width in the Y-axis direction and extends in the circumferential direction CR of the screen 221. Furthermore, the housings 311, 312, and 313 have sidewalls 352 and 353 extending in the circumferential direction CR. The sidewalls 352 and 353 have inner surfaces 355 and 356 defining the discharge channel 310. Furthermore, when the through-hole 222 connecting the defibration chamber 210 and the discharge channel 310 is defined as the communication hole Ch, and the opening edge of the through-hole 222 on the discharge channel 310 side is defined as the discharge channel-side opening edge 228, the screen 221 has through-hole rows 224 and 225 formed by a plurality of communication holes Ch arranged at intervals Gh in the circumferential direction CR. The through-hole row 224 is provided at a position where the discharge channel-side opening edge 228 of the communication hole Ch overlaps with the inner surface 355 when viewed in the radial direction RR. This facilitates ensuring airflow along the inner surface 355, thereby preventing defibrated material from accumulating near the inner surface 355.

[0124] The housings 311, 312, and 313 have a pair of side walls 352 and 353 disposed with a gap D in the Y-axis direction. Each of the side walls 352 and 353 has inner surfaces 355 and 356. The screen 221 has a pair of through-hole rows 224 and 225. One through-hole row 224 is disposed so that the discharge channel-side opening edge 228 of the communication hole Ch overlaps with the one inner surface 355 when viewed in the radial direction RR. The other through-hole row 225 is disposed so that the discharge channel-side opening edge 228 of the communication hole Ch overlaps with the other inner surface 356 when viewed in the radial direction RR. This facilitates ensuring airflow along the inner surfaces 355 and 356, thereby preventing defibrated material from accumulating near the inner surfaces 355 and 356.

[0125] In the communication holes Ch of the through-hole rows 224 and 225, the ratio of the opening area of ​​the communication holes Ch opening into the discharge passage 310 to the opening area of ​​the communication holes Ch opening on the discharge passage 310 side is 50% or greater. This further facilitates ensuring airflow along the inner surfaces 355 and 356, thereby preventing defibrated material from accumulating near the inner surfaces 355 and 356.

[0126] The mesh 221 has a plurality of through-hole rows 223 spaced apart in the Y-axis direction (Py-Wh). These through-hole rows 223 are formed by arranging through-holes 222 spaced apart in the circumferential direction CR at intervals Gh. The plurality of through-hole rows 223 include a pair of through-hole rows 224 and 225, wherein the through-holes 222 are offset in the circumferential direction CR relative to the other through-holes 222 forming the adjacent through-hole rows 223. The aperture ratio is the ratio of the total opening area of ​​the through-holes 222 provided in the mesh 221 to the area of ​​the mesh 221 forming the discharge passage 310. Furthermore, the above-described structure can increase the aperture ratio while ensuring the spacing between the through-holes 222, for example, compared to a case where the through-holes 222 and the other through-holes 222 forming the adjacent through-hole rows 223 are arranged at the same position in the circumferential direction CR. Therefore, it is easy to ensure airflow in the defibration chamber 210, the through holes 222 of the screen 221 and the discharge channel 310 to discharge the defibrated material toward the downstream side of the discharge channel 310, thereby preventing the defibrated material from accumulating in the discharge channel 310 including near the inner surfaces 355 and 356.

[0127] The intervals Gh between the through-holes 222 and other through-holes 222 surrounding the through-hole 222 are the same. This ensures that the intervals between the through-holes 222 are maintained while further increasing the aperture ratio.

[0128] The dimension of the screen 221 in the Y-axis direction is larger than the width of the discharge passage 310, and the housings 311, 312, and 313 cover the outside of the screen 221, thereby forming the discharge passage 310. This facilitates a structure in which the positions of the housings 311, 312, and 313 relative to the screen 221 can be adjusted in the Y-axis direction.

[0129] The housing 311, 312, 313 is further provided with a fixing member 211 for fixing the screen 221. The housings 311, 312, 313 are fixed to the fixing member 211 and the side wall 213 with the screen 221 sandwiched between the housings 311, 312, 313 and the fixing member 211 and the side wall 213. This facilitates a structure in which the housings 311, 312, 313 can be fixed to the fixing member 211 and the side wall 213 while the positions of the housings 311, 312, 313 are adjusted relative to the screen 221.

[0130] The defibration device 200 further includes a discharge pipe 30 to which negative pressure is applied to discharge the defibrated material from the discharge passage 310, and a discharge portion 314 that connects the discharge passage 310 with the discharge pipe 30. The housings 311, 312, and 313 include an outer peripheral wall 351 that surrounds the outside of the screen 221 in the circumferential direction CR to form the annular discharge passage 310 and is spaced apart from the screen 221 in the radial direction RR. The discharge portion 314 is provided on the outer peripheral wall 351 and opens toward the screen 221. Thus, even when the discharge passage 310 is provided outside the screen 221 across the entire circumference, the discharge portion 314 is provided so as to open toward the screen 221, thereby facilitating the negative pressure generated by the suction portion 35 to act on the upstream side of the discharge passage 310, farther from the discharge portion 314. Therefore, airflow that discharges the defibrated material toward the downstream side of the discharge passage 310 can be ensured in the defibration chamber 210, the through holes 222 of the screen 221, and the discharge passage 310, thereby suppressing the accumulation of the defibrated material.

[0131] The sheet manufacturing apparatus 100 includes a defibration device 200, a second web forming unit 70 that forms a second web Wb2 by accumulating the defibrated material discharged from the defibration device 200, and a sheet forming unit 80 that forms a fiber-containing sheet S by bonding the fibers contained in the second web Wb2. Thus, the sheet manufacturing apparatus 100 can form a sheet S from the defibrated material formed in the defibration device 200.

[0132] Although the above-described embodiments of the present invention relate to the defibration device 200 and the sheet manufacturing device 100, each having the aforementioned structure as a basis, modifications or omissions of some of the structures can be implemented without departing from the scope of the present invention. Furthermore, the above-described embodiment and other embodiments described below can be combined and implemented within the scope of no technical contradiction. Other embodiments are described below.

[0133] In the above embodiment, the pair of through-hole rows 224 and 225 may not be provided across the entire circumference of the screen 221. For example, the pair of through-hole rows 224 and 225 may be provided in region RN of the screen 221, rather than in region ERN. This allows the number of connecting holes Ch provided per unit area in region RN to be increased compared to region ERN. Furthermore, for example, the pair of through-hole rows 224 and 225 may be provided on the upstream screen 221U, rather than on the downstream screen 221D. This allows the number of connecting holes Ch provided per unit area in the upstream screen 221U to be increased compared to the downstream screen 221D.

[0134] In the above embodiment, the screen 221 does not need to have the pair of through-hole rows 224 and 225. For example, if the defibration device 200 is arranged in the sheet manufacturing apparatus 100 with the axis AR extending in the vertical direction and the side wall 213 positioned above the fixing member 211, the defibrated material is less likely to accumulate near the inner surface 356 of the discharge passage 310. In this case, the through-hole row 225 as the communicating hole group does not need to be provided. That is, the screen 221 has the through-hole row 224 as the communicating hole group.

[0135] In the above embodiment, the interval Gh between adjacent through holes 222 may be made smaller than the hole diameter Wh of the through hole 222. Figure 18As shown, the through holes 222 are arranged on the screen 221 in a manner that is offset by half of the center spacing (Gh+Wh) in the circumferential direction CR relative to the other through holes 222 formed in the adjacent through hole row 224 in the Y-axis direction. In this case, at least a portion of the discharge channel side opening edge 228 of the through hole 222 overlaps with the discharge channel side opening edge 228 of the other through holes 222 surrounding the through hole 222 in any one direction of the circumferential direction CR and the Y-axis direction. In this way, the opening ratio can be increased relative to the above-mentioned embodiment while ensuring the spacing between the through holes 222. In addition, the through hole row 226 can also be arranged on the +Y direction side of the through hole row 224, and the through hole row 226 is arranged at a position where the discharge channel side opening edge 228 of the through hole 222 overlaps with the inner surface 355 when viewed from the radial direction RR. Alternatively, through-hole row 227 may be provided on the -Y direction side of through-hole row 225, such that through-hole row 227 is provided at a position where the discharge channel-side opening edge 228 of through-hole 222 overlaps with inner surface 356 when viewed from radial direction RR. In this case, through-hole row 226 and through-hole row 227 are included in the plurality of through-hole rows 224. Furthermore, in this case, through-hole rows 224 and 226 are an example of one communicating hole group, and through-hole rows 225 and 227 are an example of the other communicating hole group.

[0136] In the above embodiment, the center distances between the through hole rows may also be different. Figure 19 As shown, through-hole row 226 is provided on the +Y side of through-hole row 224, where the discharge channel-side opening edge 228 of through-hole 222 overlaps with inner surface 355 when viewed from radial direction RR. Alternatively, through-hole row 227 may be provided on the -Y side of through-hole row 225, where the discharge channel-side opening edge 228 of through-hole 222 overlaps with inner surface 356 when viewed from radial direction RR. In this case, the center-to-center spacing Psy between through-hole rows 224 and 226, and between through-hole rows 225 and 227, is smaller than the center-to-center spacing Py between through-hole rows 224. In this case, through-hole rows 224 and 226 are one example of one connecting hole group, and through-hole rows 225 and 227 are one example of the other connecting hole group.

[0137] In the above embodiment, the opening shape of the through hole 222 may not be circular. For example, it may be an elliptical shape such as an ellipse or an elongated circle, or a polygon such as a triangle or a quadrilateral. In addition, for example, it may be Figure 20As shown, the plurality of through holes 222 provided on the screen 221 include through holes 222 of different shapes. Figure 20 In the embodiment, the through hole 222 of the through hole arrays 224 and 225 forming the connecting hole group is an elliptical shape having a width Wh in the circumferential direction CR and a width 2Wh in the Y-axis direction. In this case, the center spacing Iy between the through hole arrays 224 and 225 may be the same as the spacing D between the side walls 352 and 353. In this case, the through hole array 224 is an example of the connecting hole group on one side, and the through hole array 225 is an example of the connecting hole group on the other side. Alternatively, Figure 20 The through holes 222 forming the through hole rows 224 and 225 shown have a smaller opening area than the through holes 222 forming the through hole row 223. In this case, for example, the through holes 222 forming the through hole rows 224 and 225 may be elliptical in shape, with a width in the circumferential direction CR being half of Wh and a width in the Y-axis direction being Wh.

[0138] In the above embodiment, the through holes 222 may not be offset in the circumferential direction CR relative to other through holes 222 formed in the through hole row 224 adjacent to each other in the Y-axis direction. That is, the plurality of through holes 222 may not be arranged in a staggered manner on the mesh 221. For example, Figure 20 As shown, the through holes 222 are provided on the mesh 221 in a so-called lattice pattern, arranged at the same positions in the circumferential direction CR as other through holes 222 forming adjacent through hole rows 223 .

[0139] In the above embodiment, as long as the through-hole row 224 on one side is arranged at a position where the opening edge 228 on the discharge channel side of the connecting hole Ch overlaps with the inner side surface 355 on one side when viewed from the radial direction RR, and the through-hole row 225 on the other side is arranged at a position where the opening edge 228 on the discharge channel side of the connecting hole Ch overlaps with the inner side surface 356 on the other side when viewed from the radial direction RR, the shells 311, 312, and 313 can also be unable to move in the Y-axis direction relative to the screen 221 when covering the screen 221.

[0140] In the above embodiment, the plurality of through-holes 222 may have the same shape, and the through-holes 222 may be arranged in the mesh 221 such that the number of communication holes Ch provided per unit area of ​​the mesh 221 gradually increases as the mesh 221 moves away from the discharge portion 314 in the circumferential direction CR. In this case, for example, a through-hole row consisting of the same number of through-holes 222 arranged in the Y-axis direction may be arranged in the mesh 221 such that the spacing between the through-hole rows narrows as the mesh 221 moves away from the discharge portion 314 in the circumferential direction CR. Alternatively, for example, a through-hole row consisting of the through-holes 222 arranged in the Y-axis direction may be arranged in the mesh 221 such that the spacing between the through-hole rows is uniform in the circumferential direction CR, and the number of through-holes forming the through-hole row increases as the mesh 221 moves away from the discharge portion 314 in the circumferential direction CR. This facilitates the negative pressure generated by the suction portion 35 to act on the upstream side of the discharge passage 310 farther from the discharge portion 314. Furthermore, it facilitates reducing the velocity difference of the airflow passing through the plurality of through-holes 222 provided in the mesh 221. Therefore, it is possible to reduce the deviation in defibration of the defibrated material discharged to the discharge passage 310 .

[0141] In the above embodiment, the discharge portion 314 may not be provided on the outer peripheral wall 351. For example, the discharge portion 314 may be provided on either the side wall 353 or the side wall 352 of the housing 311. Furthermore, for example, if the discharge portion 314 is provided on the side wall 353, the discharge portion 314 may be opposite the screen 221 or opposite the side wall 352 instead of opposite the screen 221. In this case, the closing member 601 is provided in an area of ​​the downstream screen 221D that is not opposite the discharge portion 314. In other words, the closing member 601 covers the downstream screen 221D, thereby closing the opening of the through-hole 222. Furthermore, the closing member 601 is provided on the outer peripheral surface of the downstream screen 221D on the discharge passage 310 side, and closes the opening of the through-hole 222 on the outer peripheral surface side. This allows the communication between the defibration chamber 210 and the discharge passage 310, which is achieved by the through-holes 222, to be blocked. Therefore, the number of communication holes Ch provided on the downstream screen 221D can be varied, allowing a region with fewer communication holes Ch to be formed on the downstream screen 221D. In this case, the multiple through-holes 222 provided on the screen 221 do not need to have the same shape.

[0142] In the above embodiment, the defibration device 200 may not be arranged on the sheet manufacturing apparatus 100 in a posture in which the axis AR is not horizontal. In this case, the defibration device 200 may be arranged on the sheet manufacturing apparatus 100 in a posture in which the axis AR intersects the horizontal direction and is inclined, with the discharge portion 314 being located at the lowest position on the outer peripheral wall 351.

[0143] In the above embodiment, the defibration device 200 may not be arranged on the sheet manufacturing apparatus 100 with the discharge portion 314 and the discharge pipe 30 positioned vertically below the axis AR. For example, the defibration device 200 may be arranged on the sheet manufacturing apparatus 100 with the discharge portion 314 and the discharge pipe 30 positioned vertically above the axis AR. Furthermore, for example, the defibration device 200 may be arranged on the sheet manufacturing apparatus 100 with the discharge portion 314 and the discharge pipe 30 aligned horizontally with the axis AR.

[0144] In the above embodiment, the gap W between the outer peripheral wall 351 and the screen 221 may be gradually narrowed as the area moves away from the discharge portion 314 in the circumferential direction CR. For example, when the gap W in the area on the -Z direction side of the axis AR in the discharge channel 310 is set to gap W1 and the gap W in the area on the +Z direction side of the axis AR is set to gap W3, which is wider than gap W1, the gap W between the areas connecting the areas on the -Z direction side of the axis AR and the areas on the +Z direction side of the axis AR in the discharge channel 310 may be gradually narrowed from the area on the +Z direction side of the axis AR toward the area on the -Z direction side of the axis AR. Alternatively, the gap W between the areas connecting the areas on the -Z direction side of the axis AR and the areas on the +Z direction side of the axis AR in the discharge channel 310 may be narrower than gap W3 and wider than gap W1.

[0145] In the above embodiment, the discharge passage 310 may be made not to have a bilaterally symmetrical shape by taking the following conditions as conditions: Figure 14 As shown, when viewing the exhaust duct 310 from the -Y direction, a clockwise airflow toward the exhaust portion 314 is generated in the region of the exhaust duct 310 on the +X direction side of the exhaust portion 314, and a counterclockwise airflow toward the exhaust portion 314 is generated in the region on the -X direction side of the exhaust portion 314. In this case, for example, the intervals W2 and W4 can be made different, or the region where the interval W is narrowest can be offset in the X-axis direction from the position in the -Z direction of the axis AR. Furthermore, for example, the interval D between the side walls 352 and 353 can be made different between the region on the +X direction side of the exhaust portion 314 and the region on the -X direction side of the exhaust portion 314.

[0146] In the above embodiment, a fixed blade may be provided in the area of ​​the inner circumference of the screen 221 that is opposite to the rotating blade 503. The fixed blade defibrates the raw material MA introduced between the fixed blade and the rotating blade 503. In this case, the fixed blade may be fixed to the inner circumference of the screen 221 in a manner that leaves a gap with the top of the rotating blade 503. Figure 14 As shown, when viewing the screen 221 from the -Y direction, the fixed blade may have a sharp shape that protrudes from the screen 221 toward the rotating blade 503, and the fixed blade may extend in the Y-axis direction. When multiple fixed blades are provided, the multiple fixed blades may be arranged so as to span the entire circumference of the screen 221 while being spaced apart in the circumferential direction CR. Alternatively, the fixed blade may be provided in an area of ​​the inner circumferential surface of the screen 221 that is opposite to the outer circumferential surface where the sealing member 601 is provided.

[0147] In the above embodiment, the supply portion 214 only needs to be a through hole that passes through the side wall 212 in the Y-axis direction and does not need to be circular. For example, the supply portion 214 may be polygonal or elliptical, or may be an arc centered on the axis AR.

[0148] In the above embodiment, the supply portion 214 may not open at a position vertically above the axis AR in the side wall 212. For example, the supply portion 214 may open at a position in the side wall 212 aligned with the axis AR in the horizontal direction.

[0149] In the above embodiment, the discharge portion 314 may 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 inner dimension of the discharge passage 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 than the inner dimension of the discharge passage 310 in the Y-axis direction.

[0150] In the above embodiment, the size of the closure member 601 in the Y-axis direction may be different from the size of the discharge passage 310 in the Y-axis direction. For example, the size of the closure member 601 in the Y-axis direction may be smaller than the size of the discharge passage 310 in the Y-axis direction. In addition, the size of the closure member 601 in the X-axis direction may be the same as or smaller than the size of the opening edge portion 315 in the discharge portion 314 in the X-axis direction. In addition, the closure member 601 may not be rectangular. For example, the closure member 601 may be circular or elliptical.

[0151] In the above embodiment, the defibration device 200 may not be provided with the closing member 601. In this case, the through-holes 222 may be provided in the region RD so that the number of through-holes 222 provided per unit area in the screen 221 is reduced compared to the region ERD. Alternatively, the number of communicating holes Ch in the region RD may be reduced compared to the region ERD by providing the aforementioned fixed blade on the inner circumferential surface of the screen 221 corresponding to the region RD. In this case, the fixed blade can be said to be an example of a closing member that is provided on the inner circumferential surface of the screen 221 that becomes the defibration chamber 210 side and that closes the opening on the inner circumferential surface side of the through-holes 222.

[0152] In the above embodiment, the housings 311, 312, and 313 do not need to cover the entire circumference CR of the outside of the screen 221. Furthermore, the discharge passage 310 does not need to be provided on the outside of the screen 221, extending entirely along the circumference CR. For example, in the above embodiment, the area between the outside of the screen 221 and the outer peripheral wall 351 of the housing 311, which is partially covered by the housing 311, can be provided as the discharge passage 310. In this case, the through-hole 222 does not need to be provided in the area of ​​the screen 221 not covered by the housing 311.

[0153] In the above embodiment, the interval W between the outer peripheral wall 351 and the mesh 221 may be the same in the circumferential direction CR of the mesh 221. In this case, the flow channel cross-sectional area of ​​the discharge channel 310 may remain the same in the circumferential direction CR of the mesh 221.

[0154] In the above embodiment, the number of identically shaped communication holes Ch provided per unit area on the downstream screen 221D is reduced compared to the upstream screen 221U. This makes it harder for air to pass through the downstream screen 221D compared to the upstream screen 221U, when comparing the downstream and upstream screens 221D and 221U of the same area. Alternatively, the shape of the communication holes Ch may be made different between the downstream and upstream screens 221D and 221U, making it harder for air to pass through the downstream screen 221D compared to the upstream screen 221U. For example, by making the diameter of the communication holes Ch provided on the downstream screen 221D smaller than that on the upstream screen 221U, air may be harder to pass through the downstream screen 221D compared to the upstream screen 221U, when comparing the downstream and upstream screens 221D and 221U of the same area. In this case, the number of communication holes Ch provided per unit area in the downstream screen 221D may be the same as or smaller than that in the upstream screen 221U.

[0155] Explanation of symbols

[0156] 2, 3, 7, 8, 54…pipe; 9…hopper; 10…storage supply unit; 12…crushing unit; 14…crushing blade; 20…supply pipe; 30…discharge pipe; 35…suction unit; 40…screening unit; 41…roller unit; 42…introduction port; 43…storage unit; 44…discharge port; 45…first web forming unit; 46…mesh belt; 47, 47a…support rollers; 48…suction unit; 49…rotating body; 49a…base; 49b…projection; 50…mixing unit; 52…additive supply unit; 53… 2a…Additive box; 56…Mixer blower; 60…Accumulating section; 61…Roller section; 63…Storing section; 70…Second sheet forming section; 72…Mesh belt; 74…Loading roller; 76…Suction mechanism; 78…Humidity conditioning section; 79…Conveyor section; 79a…Mesh belt; 79b…Roller; 79c…Suction mechanism; 80…Sheet forming section; 82…Pressure section; 84…Heating section; 85…Calendering roller; 86…Heating roller; 90…Cutting section; 92…First cutting section; 94…Second cutting section; 96…Discharging section Discharge unit; 100…sheet manufacturing device; 200…defibration device; 210…defibration chamber; 211…fixing member; 212, 213…side walls; 214…supply unit; 221…screen; 221D…downstream screen; 221U…upstream screen; 222…through-holes; 223, 224, 225, 226, 227…rows of through-holes; 228…edge of discharge channel opening; 310…discharge channel; 310D…downstream discharge channel; 310U…upstream discharge channel; 3 11, 312, 313…shell; 314…discharge portion; 315…opening edge portion; 351…outer peripheral wall; 352, 353…side wall; 355, 356…inner side surface; 361…screw hole; 401, 402…support portion; 500…rotating body; 501…rotating shaft; 502…base; 503…rotating blade; 504…rotating blade; 601…sealing part; F1…conveying direction; W1, W2, W3, W4…interval; Wb1…first sheet; Wb2…second sheet.

Claims

1. A defibrating device comprising: A rotating body that rotates about the axis of rotation; a defibration chamber that accommodates the rotating body and forms a defibrated material from a fiber-containing raw material by rotating the rotating body; a circular annular wall, which is provided in a manner to leave a gap with the rotating body in the radial direction of the rotating body and defines the defibration chamber; a discharge passage provided so that the annular wall is disposed between the discharge passage and the defibration chamber; a housing forming the discharge passage, wherein a side wall of the housing extends in a circumferential direction of the annular wall, the side wall having an inner side surface defining the discharge passage and in contact with the annular wall, The discharge passage has a width in the axial direction of the rotating shaft and extends in the circumferential direction of the annular wall. The annular wall has a plurality of communication holes for communicating the defibration chamber and the discharge passage at intervals in the circumferential direction. The defibrated material is discharged from the defibration chamber through the communicating hole. When viewed in the radial direction, opening edges of the plurality of communication holes on the discharge channel side overlap with the inner side surface.

2. The defibrating device according to claim 1, wherein: The housing includes a pair of side walls provided at a distance from each other in the axial direction, each of the side walls having the inner side surface. The annular wall has two rows of communicating holes, In the row of communicating holes on one side, the opening edge of the communicating holes on the discharge channel side overlaps with the inner side surface on one side when viewed from the radial direction, and in the row of communicating holes on the other side, the opening edge of the communicating holes on the discharge channel side overlaps with the inner side surface on the other side when viewed from the radial direction.

3. The defibrating device according to claim 1, wherein: It also includes a fixing member, which fixes the annular wall. The housing is fixed to the fixing member with the annular wall interposed between the housing and the fixing member.

4. The defibrating device according to claim 1, wherein: Also features: a discharge pipe to which negative pressure is applied so as to discharge the defibrated material from the discharge channel; a discharge portion, which connects the discharge channel and the discharge pipe, The housing has an outer peripheral wall, the outer peripheral wall surrounding the outer side of the annular wall in the circumferential direction to form the annular discharge passage, and the outer peripheral wall is provided so as to be spaced apart from the annular wall in the radial direction. The discharge portion is provided on the outer peripheral wall and opens toward the annular wall.

5. A fiber body manufacturing device comprising: The defibrating device according to any one of claims 1 to 4; a web forming unit that forms a web by accumulating the defibrated material discharged from the defibration device; The fiber body forming portion forms a fiber body containing the fibers by bonding the fibers contained in the web together.

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