Fiber defibrator, fiber manufacturing equipment

Abstract

To prevent a possibility of retaining of a defibrated product discharged to a discharge path on an inner surface of the discharge path in a defibrating device that discharges the defibrated product to the discharge path.SOLUTION: A defibrating device 200 has a screen 221 and housings 311, 312, 313. Lateral walls 352, 353 of the housings 311, 312, 313 have inner surfaces 355, 356 that demarcate an inner surface of a discharge path 310. When an open hole 222 interconnecting a defibrating chamber 210 and the discharge path 310 is a communication hole Ch, and an opening edge on the discharge path 310 side of the open hole 222 is a discharge path side opening edge 228, the screen 221 has opening hole rows 224, 225. The opening hole rows 224, 225 are formed of a plurality of communication holes Ch aligned at an interval Gh in circumferential direction CR. The opening hole row 224 is provided at a position at which the discharge path side opening edge 228 of the communication hole Ch overlaps the inner surface 355 seen from radial direction RR.SELECTED DRAWING: Figure 17

Description

[Technical Field]

[0001] The present invention relates to a defibrating device and a fibrous body manufacturing device. [Background technology]

[0002] Patent Document 1 discloses a defibration device in which a rotor housed in a defibration chamber rotates, causing defibrated material formed from the raw material to be discharged through a discharge path that extends along the outside of the annular wall that defines the defibration chamber. In this defibration device, the discharge path and the defibration chamber are connected by multiple through holes provided in the annular wall of the defibration chamber. Furthermore, the defibrated material formed in the defibration chamber passes through the through holes due to the airflow and is discharged to the discharge path. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-158944 Summary of the Invention [Problem to be solved by the invention]

[0004] However, with the defibrating device described in Patent Document 1, there is a risk that the defibrated material discharged into the discharge path may accumulate on the inner surface of the discharge path. [Means for solving the problem]

[0005] The defibration device comprises: a rotor that rotates around the axis of a rotation shaft; a defibration chamber that houses the rotor and in which defibrated material is formed from a raw material containing fibers as the rotor rotates; a discharge path that communicates with the defibration chamber and discharges the defibrated material from the defibration chamber; an annular wall that is provided in the radial direction of the rotor with a gap between it and the rotor and that defines the defibration chamber; a housing that forms the discharge path; and a plurality of through holes that are provided in the annular wall and that penetrate the annular wall in the radial direction, and the discharge path is an axial center that extends along the axis. the annular wall has a width in the circumferential direction and extends circumferentially of the annular wall, the housing has side walls extending in the circumferential direction, the side walls have an inner surface that defines the discharge channel, the through holes that communicate the defibrating chamber and the discharge channel are defined as communicating holes, and the opening edges of the through holes on the discharge channel side are defined as discharge channel side opening edges, the annular wall has a group of communicating holes that are formed by a plurality of the communicating holes that are lined up at intervals in the circumferential direction, and the group of communicating holes is provided at a position where the discharge channel side opening edges of the communicating holes overlap with the inner surface when viewed in the radial direction.

[0006] The fibrous body manufacturing apparatus includes the defibrator described above, a web forming section that forms a web by depositing the defibrated material discharged from the defibrator, and a fibrous body forming section that forms a fibrous body containing the fibers by binding the fibers contained in the web. [Brief explanation of the drawings]

[0007] [Figure 1] 1 is a schematic diagram illustrating a configuration of a sheet manufacturing apparatus according to an embodiment of the present disclosure. [Figure 2] FIG. 2 is a side view of a defibrating device according to an embodiment of the present disclosure, viewed from the −X direction side. [Figure 3] A side view of the defibrator seen from the -Y direction. [Figure 4] FIG. 4 is a cross-sectional view showing the d4-d4 cross section shown in FIG. 3. [Figure 5] FIG. [Figure 6] FIG. 10 is a perspective view showing the defibrating chamber with a portion of the screen removed. [Figure 7] FIG. [Figure 8] An enlarged view of part s8 shown in Figure 7. [Figure 9] FIG. 2 is a perspective view showing the defibrating device with a part of the housing removed. [Figure 10] FIG. [Figure 11] FIG. 3 is a cross-sectional view showing the d11-d11 cross section shown in FIG. 2. [Figure 12] FIG. 12 is a cross-sectional view showing a state in which the rotor is removed from FIG. 11. [Figure 13] FIG. [Figure 14] FIG. 4 is a cross-sectional view showing the specifications of the discharge path and the discharge portion. [Figure 15] Cross-sectional view showing the specifications of the discharge channel and screen. [Figure 16] FIG. 4 is a cross-sectional view showing the d16-d16 cross section shown in FIG. 3. [Figure 17] A partial exploded view of the screen seen from the discharge channel side. [Figure 18] FIG. 10 is a partial development view showing another embodiment of the screen. [Figure 19] FIG. 10 is a partial development view showing another embodiment of the screen. [Figure 20] FIG. 10 is a partial development view showing another embodiment of the screen. DETAILED DESCRIPTION OF THE INVENTION

[0008] The present invention will be described below based on embodiments. In each drawing, the same components are assigned the same reference numerals, and redundant explanations will be omitted. In this specification, "same" does not only mean being completely the same, but also includes being the same taking into account measurement errors, being the same taking into account manufacturing variations of components, and being the same to the extent that functionality is not impaired. Therefore, for example, "their dimensions are the same" means that, taking into account measurement errors and manufacturing variations of components, the dimensional difference between the two components is within ±10% of one dimension, more preferably within ±5%, and particularly preferably within ±3%.

[0009] In each figure, X, Y, and Z represent three mutually orthogonal spatial axes. In this specification, the directions along these axes are referred to as the X-axis, Y-axis, and Z-axis directions. When specifying a direction, a positive direction is designated as "+" and a negative direction as "-," and both positive and negative signs are used to indicate the direction, with the direction indicated by the arrow in each figure being the + direction and the direction opposite the arrow being the - direction. The Z-axis direction indicates the direction of gravity, the +Z direction indicates a vertically downward direction, and the -Z direction indicates a vertically upward direction. In addition, the plane including the X-axis and Y-axis will be referred to as the XY plane, the plane including the X-axis and Z-axis as the XZ plane, and the plane including the Y-axis and Z-axis as the YZ plane. The XY plane will be a horizontal plane. Furthermore, the three spatial axes X, Y, and Z, which are not limited to positive and negative directions, will be referred to as the X-axis, Y-axis, and Z-axis.

[0010] 1. Embodiment 1 The configuration of a sheet manufacturing apparatus 100 according to embodiment 1 will be described. The sheet manufacturing apparatus 100 performs a recycling process in which raw material MA containing fibers is fibrous and recycled into a new sheet S. The sheet manufacturing apparatus 100 is an example of a fibrous body manufacturing apparatus. The sheet S is also an example of a fibrous body.

[0011] As shown in FIG. 1, the sheet manufacturing apparatus 100 includes a storage and supply section 10, a crushing section 12, a defibrating device 200, a sorting section 40, a first web forming section 45, a rotating body 49, a mixing section 50, a deposition section 60, a second web forming section 70, a conveying section 79, a sheet forming section 80, and a cutting section 90.

[0012] The storage / feed section 10 is an automatic feeding device that stores raw material MA and continuously feeds the raw material MA into the crushing section 12. The raw material MA may be any material that contains fiber, such as waste paper, discarded paper, or pulp sheets.

[0013] The crushing unit 12 is equipped with crushing blades 14 that cut the raw material MA supplied by the storage and supply unit 10, and the raw material MA is cut in the air by the crushing blades 14 into small pieces of several centimeters square. A shredder, for example, can be used as the crushing unit 12. The raw material MA cut in the crushing unit 12 is collected in a hopper 9 and transported via a pipe 2 to a supply pipe 20 of the defibration device 200.

[0014] The coarsely crushed pieces are transported by the airflow from the crushing section 12 to the defibration device 200. In the defibration device 200, the coarsely crushed pieces are supplied from the supply pipe 20 to the defibration chamber 210, which will be described later, and the rotor 500 housed in the defibration chamber 210 rotates, defibrating the coarsely crushed pieces.

[0015] A suction unit 35 is provided on the pipe 3 connected to the discharge pipe 30. The suction unit 35 is equipped with a blower that can apply negative pressure to the discharge pipe 30 by sucking air from the pipe 3 on the discharge pipe 30 side. The defibrated material in the defibrating chamber 210 is discharged from the defibrator 200 via a discharge path 310 (described below) and the discharge pipe 30 by an airflow generated by the negative pressure applied to the discharge pipe 30. The defibrated material discharged from the defibrator 200 is transferred to the sorting unit 40 via the pipe 3 connected to the discharge pipe 30. The configuration of the defibrator 200 will be described later.

[0016] The sorting unit 40 sorts the components contained in the defibrated material according to the size of the fibers. The sorting unit 40 has a drum unit 41 and a storage unit 43 that stores the drum unit 41. The drum unit 41 uses, for example, a sieve.

[0017] The defibrated material introduced into the drum section 41 from the inlet 42 is separated into passing material that passes through the opening of the drum section 41 and residual material that does not pass through the opening as the drum section 41 rotates. The first sorted material, which is the passing material that has passed through the opening, descends inside the storage section 43 towards the first web forming section 45.

[0018] The second sorted material, which is the residue that does not pass through the opening, is re-sent from discharge port 44 communicating with the inside of drum section 41 via pipes 8,2 to supply pipe 20 of defibration device 200.

[0019] The first web forming unit 45 includes a mesh belt 46, tension rollers 47, 47a, and a suction unit 48. The mesh belt 46 is an endless belt that is stretched over a plurality of tension rollers 47, 47a. The mesh belt 46 travels around a track defined by the tension rollers 47, 47a. A portion of the track of the mesh belt 46 is flat below the drum unit 41, and the mesh belt 46 forms a flat surface. The suction unit 48 corresponds to a suction mechanism.

[0020] A large number of openings are formed in the mesh belt 46. Of the first sorted materials that fall from the drum unit 41 located above the mesh belt 46, components larger than the openings of the mesh belt 46 are deposited on the mesh belt 46. Furthermore, of the first sorted materials, components smaller than the openings of the mesh belt 46 pass through the openings.

[0021] The suction unit 48 is equipped with a blower (not shown) and sucks air from the opposite side of the mesh belt 46 from the drum unit 41. Components that pass through the openings in 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 attracting the first sorted materials that are descending from the drum unit 41 to the mesh belt 46, thereby promoting deposition.

[0022] The components deposited on the mesh belt 46 take on a web shape and form the first web Wb1. The basic configurations of the mesh belt 46, tension rollers 47, 47a, and suction unit 48 are similar to those of the mesh belt 72, tension roller 74, and suction mechanism 76 of the second web forming unit 70, which will be described later.

[0023] The first web Wb1 is transported to the rotating body 49 as the mesh belt 46 moves.

[0024] The rotating body 49 has 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 rotates in direction D, the protrusion 49b rotates around the base 49a.

[0025] The rotor 49 is located at the end of the flat portion of the track of the mesh belt 46, on the side of the tension roller 47a. Because the track of the mesh belt 46 bends downward at this end, the first web Wb1 conveyed by the mesh belt 46 protrudes from the mesh belt 46 and comes into contact with the rotor 49. The first web Wb1 is unraveled as the protrusions 49b collide with the first web Wb1, forming small fibrous clumps. These clumps pass through the pipe 7 located below the rotor 49 and are conveyed to the mixing section 50.

[0026] The mixing section 50 mixes the first sorted material with the additive. The mixing section 50 has an additive supply section 52 that supplies the additive, a pipe 54 that transports the first sorted material and the additive, and a mixing blower 56.

[0027] The additive supply unit 52 supplies the additive, which consists of fine powder or particles, contained in the additive cartridge 52a to the tube 54.

[0028] The additive supplied from the additive supply unit 52 contains a resin for binding the plurality of fibers, i.e., a binder. The resin contained in the additive melts when passing through the sheet forming unit 80, binding the plurality of fibers.

[0029] The mixing blower 56 generates an airflow in the pipe 54 connecting the pipe 7 and the accumulation section 60. The first sorted material conveyed from the pipe 7 to the pipe 54 and the additive supplied to the pipe 54 by the additive supply section 52 are mixed when passing through the mixing blower 56.

[0030] The depositing section 60 loosens the fibers of the mixture and drops it onto the second web forming section 70 while dispersing it in the air.

[0031] The deposition unit 60 has a drum unit 61, an inlet 62 for introducing the mixture into the drum unit 61, and a storage unit 63 for storing the drum unit 61. The drum unit 61 is a cylindrical structure configured in the same manner as the drum unit 41, for example, and rotates by the power of a motor (not shown) in the same manner as the drum unit 41, and functions as a sieve.

[0032] 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.

[0033] Of the mixture that falls from the drum unit 61 located above the mesh belt 72, components larger than the openings of the mesh belt 72 are deposited on the mesh belt 72. The components deposited on the mesh belt 72 take on a web shape and form the second web Wb2.

[0034] A humidity control unit 78 is provided downstream of the deposition unit 60 on the transport path of the mesh belt 72. The moisture content of the second web Wb2 is adjusted by the moisture supplied by the humidity control unit 78, which is expected to have the effect of suppressing adhesion of fibers to the mesh belt 72 due to static electricity.

[0035] The second web Wb2 is peeled off from the mesh belt 72 by the conveyor 79 and conveyed to the sheet forming unit 80. The conveyor 79 includes, for example, a mesh belt 79a, rollers 79b, and a suction mechanism 79c. The suction mechanism 79c includes a blower (not shown) and generates an upward airflow through the mesh belt 79a by the suction force of the blower. This airflow causes the second web Wb2 to separate from the mesh belt 72 and be attracted to the mesh belt 79a. The mesh belt 79a is moved by the rotation of the rollers 79b, and conveys the second web Wb2 to the sheet forming unit 80.

[0036] The mesh belt 79a can be configured as an endless belt having openings, similar to the mesh belt 46 and the mesh belt 72.

[0037] The sheet forming unit 80 applies heat to the second web Wb2, thereby binding the fibers originating from the first sorted material and contained in the second web Wb2 with the resin contained in the additive.

[0038] The sheet forming unit 80 includes a pressurizing unit 82 that pressurizes the second web Wb2 and a heating unit 84 that heats the second web Wb2 that has been pressed by the pressurizing unit 82. The pressurizing unit 82 presses the second web Wb2 at a predetermined nip pressure using a pair of calender rollers 85 and transports it toward the heating unit 84. The heating unit 84 applies heat to the densified second web Wb2 by sandwiching it between a pair of heating rollers 86, and transports it to the cutting unit 90. In the heating unit 84, the resin contained in the second web Wb2 is heated, and the second web Wb2 becomes a sheet S. The sheet forming unit 80 is an example of a fibrous body forming unit.

[0039] The cutting unit 90 cuts the sheet S formed in the sheet forming unit 80. The cutting unit 90 has a first cutting unit 92 that cuts the sheet S in a direction intersecting the conveying direction F1 of the sheet S, indicated by the symbol F1 in the figure, and a second cutting unit 94 that cuts the sheet S in a direction parallel to the conveying direction F1. The cutting unit 90 cuts the sheet S to a predetermined length and width to form single sheets S. The sheets S cut in the cutting unit 90 are stored in a discharge unit 96.

[0040] Next, we will explain the configuration of the defibration device 200. The defibration device 200 is a device that performs processing to untangle raw material MA, which is a state in which multiple fibers are bound together, into one or a small number of fibers. The defibration device 200 is a dry-type defibration processing device that performs processing such as defibration not in a liquid but in air such as the atmosphere or air.

[0041] 2 to 5, the defibrator 200 comprises a rotor 500, a defibrating chamber 210, a supply pipe 20, a discharge path 310, and a discharge pipe 30. The defibrator 200 forms defibrated material from raw material MA supplied via the supply pipe 20 by rotating the rotor 500 housed in the defibrating chamber 210 around the axial center AR of the rotation shaft 501 as the center of rotation. The defibrator 200 also comprises a screen 221, a fixing member 211, and side walls 212, 213 that define the defibrating chamber 210, housings 311, 312, 313 that define the discharge path 310, support parts 401, 402 that support the rotor 500, and a blocking member 601. In the following description, the rotation direction of the rotation shaft 501 around the axial center AR may be referred to as the circumferential direction CR, and the radial direction of the rotation shaft 501 may be referred to as the radial direction RR.

[0042] The rotating body 500 has a rotating shaft 501, a base 502, a rotating blade 503, and a rotating feather 504. The rotating body 500 is housed in the defibrating chamber 210 so that the axial center 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 defibrating device 200 is placed in the sheet manufacturing apparatus 100 in an orientation where the axial center AR is horizontal. The base 502 has a disk shape, and is inserted into and fixed to the rotating shaft 501. The rotating blade 503 is provided so as to protrude in a direction away from the base 502 in the radial direction RR. The rotating blade 503 has a plate-like protruding shape. A plurality of rotating blades 503 are formed at intervals in the circumferential direction CR.

[0043] A plurality of rotary blades 504 are provided at intervals in the circumferential direction CR on the +Y direction side of the base 502. As shown in Fig. 5, in this embodiment, the rotary blades 503 and the base 502 are formed by stacking thin plates in the Y axis direction, but they may also be formed from an integrated block.

[0044] 4 and 6, the fixed member 211 has a cylindrical shape. The fixed member 211 is located on the +Y side of the rotary blade 503 in the Y-axis direction.

[0045] As shown in Figures 4, 10, and 12, the side wall 212 is disk-shaped. The side wall 212 is located on the +Y direction side of the fixing member 211. The side wall 212 is fixed to the fixing member 211, thereby defining the inner surface on the +Y direction side of the defibrating chamber 210. The side wall 212 is provided with a support unit 401, a supply pipe 20, and a supply unit 214.

[0046] 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 of the rotary blade 503 of the rotary body 500. The support portion 401 supports the rotation shaft 501 of the rotary body 500 so that the rotary body 500 can rotate around the axis AR. The support portion 401 supports the rotation shaft 501 of the rotary body 500 on the +Y direction side of the rotary blade 503.

[0047] The rotating shaft 501 is rotationally driven by a drive mechanism (not shown). In this embodiment, the drive mechanism is configured with a belt and a pulley, and power is transmitted to the belt and the pulley from a rotation drive source (not shown), causing the rotating body 500 to rotate around the axis AR. In this embodiment, the rotating body 500 rotates counterclockwise around the axis AR in FIG. 11 , but it may also rotate clockwise. Alternatively, the rotating body 500 may rotate in both clockwise and counterclockwise directions around the axis AR in FIG. 11 . Furthermore, the configuration for rotationally driving the rotating shaft 501 does not have to be a configuration using a belt and a pulley.

[0048] The supply pipe 20 supplies raw material MA containing fibers to the defibrating chamber 210. As shown in FIGS. 4, 6, and 12, the supply pipe 20 has a tubular shape. The supply pipe 20 is provided on the surface of the side wall 212 on the +Y direction side. The supply pipe 20 is provided on the side wall 212 at a position that is in the -Z direction of the axial center AR of the rotating shaft 501. The supply pipe 20 extends in the Y-axis direction. The supply unit 214 is a circular through-hole that penetrates the side wall 212 in the Y-axis direction. The supply unit 214 connects the supply pipe 20 and the defibrating chamber 210. Therefore, the supply unit 214 opens on the side wall 212 at a position that is in the -Z direction, vertically above the axial center AR of the rotating shaft 501. In other words, the supply unit 214 opens on the side wall 212 at a position that is farther away from the discharge unit 314, which will be described later, than the axial center AR.

[0049] As shown in Figures 4, 6, and 10, the side wall 213 has a disk shape. The side wall 213 is located on the -Y direction side of the fixed member 211. The side wall 213 is also located on the -Y direction side of the rotary blade 503 of the rotor 500. The side wall 213 is fixed to the fixed member 211 via the screen 221, thereby defining the inner surface of the -Y direction side of the defibrating chamber 210. A support part 402 is provided on the side wall 213 to support the -Y direction side of the rotary blade 503 on the rotation shaft 501 of the rotor 500.

[0050] As shown in Figures 4, 6 to 9, and 11 to 14, the screen 221 has a thin plate shape. The screen 221 is located between the fixing member 211 and the side wall 213 in the Y-axis direction. The screen 221 is fixed to the fixing member 211 and the side wall 213, thereby forming an annular shape. The screen 221 is provided with a gap between it and the rotary blade 503 in the radial direction RR.

[0051] The dimension in the Y-axis direction, which is the width dimension of screen 221, is larger than the dimension in the Y-axis direction of rotary blade 503. In the Y-axis direction, the tip of rotary blade 503 is located within the width of screen 221. Screen 221 is fixed to fixing member 211 and side wall 213, thereby defining the inner circumferential surface of cylindrical defibrating chamber 210. Screen 221 defines an area of ​​the inner circumferential surface of defibrating chamber 210 that faces the tip of rotary blade 503. Screen 221 is an example of an annular wall.

[0052] The screen 221 is made of, for example, a thin metal plate member. The screen 221 of this embodiment is formed in an annular shape by fixing a plurality of thin metal plate members to the fixing member 211 and the side wall 213 so that they are aligned in the circumferential direction CR. Stainless steel, for example, can be used as the metal material.

[0053] As shown in Figures 4 and 9 to 14, the housings 311, 312, and 313 are provided to surround the outside of the screen 221 in the circumferential direction CR. The housings 311, 312, and 313 form the discharge path 310 by covering the entire outside of the screen 221 in the circumferential direction CR. The housings 311, 312, and 313 are fixed to the fixing member 211 and the side wall 213 in a state in which the screen 221 is sandwiched between the housings 311, 312, and 313 and the fixing member 211 and the side wall 213. In this case, the side wall 213 can be considered an example of a fixing member that fixes the screen 221.

[0054] The housings 311, 312, and 313 each have an outer peripheral wall 351, a side wall 352, and a side wall 353. The outer peripheral wall 351 is provided at a distance W from the screen 221 in the radial direction RR. The outer peripheral wall 351 has an annular shape. The distance W between the outer peripheral wall 351 and the screen 221 in the radial direction RR is the inner dimension of the discharge channel 310 in the radial direction RR.

[0055] Outer peripheral wall 351 defines the inner peripheral surface of discharge channel 310. Side wall 352 is located on the +Y direction side of outer peripheral wall 351 and extends in the circumferential direction CR. Side wall 352 has an inner surface 355 that defines the inner surface of discharge channel 310 on the +Y direction side. Side wall 353 is located on the -Y direction side of side wall 352 and extends in the circumferential direction CR. Side wall 353 has an inner surface 356 that defines the inner surface of discharge channel 310 on the -Y direction side. Furthermore, distance D between inner surfaces 355 and 356 in the Y axis direction is the width dimension of discharge channel 310 in the Y axis direction. The discharge passage 310 of this embodiment is formed in a ring shape by fixing three housings 311, 312, 313 to the fixing member 211 and the side wall 213 with the screen 221 sandwiched therebetween so that they are aligned in the circumferential direction CR.

[0056] As shown in Fig. 4 and Fig. 11 to Fig. 14, the discharge path 310 is provided on the outside of the screen 221 around the entire circumference in the circumferential direction CR. The discharge path 310 has a width in the Y-axis direction and extends in the circumferential direction CR of the screen 221. The discharge path 310 communicates with the defibrating chamber 210 via multiple through holes 222 provided in the screen 221. The defibrated material formed in the defibrating chamber 210 is discharged to the discharge path 310 via the multiple through holes 222. Note that the discharge path 310 may be formed by a single housing member.

[0057] An exhaust pipe 30 and an exhaust portion 314 are provided on the outer peripheral wall 351 of the housing 311. The exhaust pipe 30 is provided on the +Z direction side of the outer peripheral wall 351 of the housing 311. The exhaust pipe 30 is located on the +Z direction side vertically below the axis AR of the rotation shaft 501. Therefore, the exhaust pipe 30 is provided at the lowest position on the outer peripheral wall 351. The exhaust pipe 30 has a tubular shape. The exhaust pipe 30 extends from the outer peripheral wall 351 in the +Z direction.

[0058] Discharge portion 314 is a through hole that penetrates outer peripheral wall 351 in the Z-axis direction. Discharge portion 314 has a substantially rectangular shape when viewed from the Z-axis direction. Opening edge 315 is the edge of the opening of discharge portion 314 on the discharge path 310 side. The dimension of opening edge 315 in the Y-axis direction is the same as the inner dimension of discharge path 310 in the Y-axis direction. The dimension of opening edge 315 in the X-axis direction is set to be 40 mm to 50 mm. The dimension of discharge portion 314 in the Y-axis direction is the same as the inner dimension of discharge path 310 in the Y-axis direction.

[0059] The discharge section 314 communicates between the discharge path 310 and the discharge pipe 30. The discharge section 314 is provided on the outer peripheral wall 351 and opens toward the screen 221. Therefore, the discharge section 314 is provided on the outer peripheral wall 351 at a position in the +Z direction that is vertically below the axis AR of the rotation shaft 501. In other words, the discharge section 314 is provided at the lowest position on the outer peripheral wall 351.

[0060] In this embodiment, the distance D between the side walls 352 and 353 is constant around the entire circumference of the screen 221. The distance D is set to a predetermined dimension of, for example, 40 mm to 50 mm. On the other hand, the distance W between the outer peripheral wall 351 and the screen 221 is narrower in a region away from the opposing region where the discharge portion 314 faces in the circumferential direction CR of the screen 221 than in a region where the discharge portion 314 faces.

[0061] For example, as shown in FIG. 14, in the discharge path 310, the interval W of the region located in the -Z direction of the axis AR is interval W1, the interval W of the region located in the +X direction of the axis AR is interval W2, the interval W of the region located in the +Z direction of the axis AR is interval W3, and the interval W of the region located in the -X direction of the axis AR is interval W4. In this case, interval W1 is narrower than interval W3. Furthermore, interval W2 and interval W4 are narrower than interval W3. Furthermore, interval W1 is narrower than interval W2 and interval W4. In this embodiment, interval W2 and interval W4 are the same.

[0062] In this embodiment, the interval W gradually decreases in the circumferential direction CR of the screen 221 as it moves away from the discharge portion 314. The interval D between the side walls 352 and 353 is constant around the entire circumference of the screen 221. Therefore, the flow path cross-sectional area of ​​the discharge channel 310 gradually decreases in the circumferential direction CR of the screen 221 as it moves away from the discharge portion 314. In this embodiment, for example, the interval W1 is set to 5 mm, the interval W2 and the interval W4 are set to 10 mm, and the interval W3 is set to 15 mm.

[0063] As shown in FIG. 8, the screen 221 has a plurality of through holes 222 formed therein that penetrate the screen 221 in the radial direction RR, which is the thickness direction. In this embodiment, the plurality of through holes 222 have the same shape. The through holes 222 in this embodiment are circular holes. The diameter of the through holes 222 is set to a size that allows defibrated material that has been defibrated to a desired degree to pass through. The screen 221 may be formed by forming the through holes 222 in a thin plate member by punching, etching, cutting, or the like. Note that the screen 221 may be made of a single thin plate member.

[0064] As shown in Figs. 7, 8, 11, 16, and 17, the multiple through holes 222 are provided so as to be distributed in the circumferential direction CR of the screen 221. Fig. 17 is a development view in which the annular screen 221 is developed into a flat plate as seen from the discharge path 310 side to explain the arrangement of the multiple through holes 222. Therefore, Fig. 17 corresponds to the state in which the annular screen 221 is viewed from the radial direction RR. Furthermore, the Y-axis direction and the circumferential direction CR shown in Fig. 17 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 defibrating chamber 210. Furthermore, in Fig. 17, the positions of the inner surfaces 355 and 356 when the housings 311, 312, and 313 cover the outside of the screen 221 to form the discharge path 310 are indicated by two-dot chain lines. The same applies to Figs. 18 to 20 which show other embodiments of the screen 221 described later.

[0065] 17, the screen 221 is provided with a plurality of through-hole rows 223, each having a hole diameter φWh and arranged at intervals Gh in the circumferential direction CR, at the same center-to-center pitch Py in the Y-axis direction. In other words, the screen 221 is provided with a plurality of through-hole rows 223, each having a hole diameter φWh and arranged at intervals Gh in the circumferential direction CR, at the same intervals (Py-Wh) in the Y-axis direction.

[0066] Furthermore, a pair of through-hole rows 224, 225 are provided in the screen 221 corresponding to the positions of the inner surfaces 355, 356. In this embodiment, the through-hole rows 224, 225 are formed by arranging through-holes 222 having a hole diameter φWh at an interval Gh in the circumferential direction CR. Furthermore, the through-hole rows 224, 225 are provided at the same center-to-center pitch Py as the through-hole row 223 adjacent to them in the Y-axis direction. As a result, the center-to-center pitch Iy between the through-hole row 224 and the through-hole row 225 is an integer multiple of the center-to-center pitch Py. Therefore, the through-hole rows 224, 225 are included in the multiple through-hole rows 223.

[0067] In this embodiment, the through holes 222 are offset in the circumferential direction CR from other through holes 222 that form adjacent through hole rows 223 in the Y-axis direction. That is, the multiple through holes 222 are provided in a so-called staggered pattern in the screen 221. In this embodiment, the through holes 222 are offset in the circumferential direction CR by half the center-to-center pitch (Gh+Wh) from other through holes 222 that form adjacent through hole rows 223 in the Y-axis direction.

[0068] The diameter Wh of the through holes 222 is preferably φ0.3 mm or more and φ2.0 mm or less. The interval Gh between adjacent through holes 222 is preferably the same dimension as the thickness of the screen 221 to twice the diameter Wh of the through holes 222, and more preferably half to twice the diameter Wh of the through holes 222. The interval Gh between adjacent through holes 222 is the dimension of the remaining wall portion of the screen 221, which is the shortest distance between the opening edges of adjacent through holes 222.

[0069] In this embodiment, the through hole 222 has a hole diameter φWh and a center-to-center pitch Py between adjacent through hole rows 223 so that the distance between the six other through holes 222 surrounding the through hole 222 is the same as the distance Gh between adjacent through holes 222 in the circumferential direction CR. For example, the hole diameter Wh of the through hole 222 is φ0.6 mm, and the center-to-center pitch Py between adjacent through hole rows 223 in the circumferential direction CR is 1.5 mm. In this case, the distance Gh between adjacent through holes 222 is Gh = 2 / (3^0.5) * Py - Wh = 1.1 mm. Alternatively, the distance Gh between adjacent through holes 222 is Gh = (3^0.5) * Py - Wh = 2.0 mm. Furthermore, when the through-hole rows 223 including the through-hole rows 224 and 225 are arranged in 29 rows in the Y-axis direction, the center-to-center pitch Iy between the through-hole rows 224 and 225 is 42 mm.

[0070] An opening edge of the through hole 222 on the discharge channel 310 side is defined as a discharge channel-side opening edge 228. In this case, the through hole row 224 is provided at a position where the discharge channel-side opening edge 228 of the through holes 222 forming the through hole row 224 overlaps with the inner surface 355 when viewed in the radial direction RR. Furthermore, the through hole row 225 is provided at a position where the discharge channel-side opening edge 228 of the through holes 222 forming the through hole row 225 overlaps with the inner surface 356 when viewed in the radial direction RR. Furthermore, as shown in FIG. 16 , the fixing member 211 is located on the +Y direction side with respect to the inner surface 355 and the through hole row 224 in the Y axis direction. Furthermore, the side wall 213 is located on the −Y direction side with respect to the inner surface 356 and the through hole row 225 in the Y axis direction.

[0071] Therefore, when the through holes 222 communicating between the defibrating chamber 210 and the discharge channel 310 are defined as communicating holes Ch, the through hole row 224 is provided at a position where the discharge channel side opening edges 228 of the communicating holes Ch forming the through hole row 224 overlap with the inner surface 355 when viewed from the radial direction RR. Furthermore, the through hole row 225 is provided at a position where the discharge channel side opening edges 228 of the communicating holes Ch forming the through hole row 225 overlap with the inner surface 356 when viewed from the radial direction RR. The through hole rows 224, 225 are an example of a pair of communicating hole groups. Furthermore, the through hole row 224 is an example of one communicating hole group, and the through hole row 225 is an example of the other communicating hole group.

[0072] In FIG. 17, in the through-hole row 224, the +Y-direction side of the discharge path-side opening edge 228 of the through-hole 222 is in contact with the inner surface 355, and in the through-hole row 225, the -Y-direction side of the discharge path-side opening edge 228 of the through-hole 222 is in contact with the inner surface 356. In this case, in the through-holes 222 of the through-hole rows 224 and 225, the ratio of the opening area that opens into the discharge path 310 to the opening area that opens on the discharge path 310 side of the through-hole 222 is 100%. Note that when considering manufacturing variations in components such as the screen 221 and the housings 311, 312, 313, and positional variations of the housings 311, 312, 313 with respect to the screen 221, the distance D between the inner surface 355 and the inner surface 356 is set to a dimension that satisfies Iy - Wh < D ≦ Iy + Wh.

[0073] The ratio of the opening area that opens into the discharge path 310 to the opening area that opens on the discharge path 310 side of the through-hole 222 is preferably 50% or more, and more preferably 80% or more. In the present embodiment, as shown in FIG. 16, the housings 311, 312, 313 are fixed to the fixing member 211 and the side wall 213 in a state of covering the screen 221. Further, the housings 311, 312, 313 are fixed to the fixing member 211 and the side wall 213 in a state of sandwiching the screen 221 between the fixing member 211 and the side wall 213. Further, the housings 311, 312, 313 are fixed to the fixing member 211 and the side wall 213 by inserting a fixing screw (not shown) through a screw hole 361 provided in the housings 311, 312, 313 and tightening the fixing screw.

[0074] For example, when fixing the housing 312 to the fixing member 211 and the side wall 213, first, the housing 312 is arranged at a position covering 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 surface 355 and the inner surface 356. Therefore, as shown by the white arrow in FIG. 16, the housing 312 can move in the Y-axis direction with respect to the screen 221 in a state of covering the screen 221.

[0075] Furthermore, the position of the housing 312 can be moved in the Y-axis direction relative to the screen 221 with the screen 221 sandwiched between the housing 312 and the fixing member 211 and the side wall 213. Therefore, the position of the housing 312 can be adjusted to a position where the inner surface 355 overlaps the discharge path side opening edge 228 of the through-hole row 224 provided in the screen 221, and the inner surface 356 overlaps the discharge path side opening edge 228 of the through-hole row 225.

[0076] Furthermore, the size of the screw holes 361 is set to be larger than the thread diameter of the fixing screws so that the housing 312 can be fastened and fixed to the fixing member 211 and the side wall 213 with the fixing screws in a state where the position of the housing 312 has been 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 with the position of the housing 312 adjusted relative to the screen 221.

[0077] In the present embodiment, it can be said that a plurality of through-hole rows in which the through holes 222 are aligned in the Y-axis direction are provided at equal intervals Gh in the circumferential direction CR all around the screen 221, but a plurality of through-hole rows in which the through holes 222 are aligned in the Y-axis direction may also be provided at different intervals in the circumferential direction CR all around the screen 221. Alternatively, a group of through holes in which the through holes 222 are aligned in the Y-axis direction and in the circumferential direction CR may be provided at equal intervals in the circumferential direction CR all around the screen 221. In addition, in the present embodiment, the same number of through holes 222 are aligned in the Y-axis direction to form a through-hole row, but the number of through holes forming each through-hole row may differ from one another.

[0078] When the through-holes 222 are formed in the thin plate member by etching, the thin plate member may be made of, for example, SUS430, SUS304, or SUS316L. Alternatively, the screen 221 may be a mesh formed by weaving wires. In this case, the mesh openings correspond to the through-holes 222.

[0079] As shown in Fig. 4 and Fig. 11 to Fig. 14, the blocking member 601 is provided on the outer peripheral surface of the screen 221 that faces the discharge path 310. The blocking member 601 is provided in an opposing area of ​​the screen 221 that faces the discharge section 314. The blocking member 601 is located in the +Z direction of the axis AR. The blocking member 601 covers the outer peripheral surface of the screen 221 that faces the discharge path 310, thereby blocking the openings of the through holes 222 on the discharge path 310 side. The blocking member 601 blocks the through holes 222 provided in an area of ​​the screen 221 that is close to the discharge section 314. The blocking member 601 may also be provided on the inner peripheral surface of the screen 221 that faces the defibrating chamber 210. In this case, the blocking member 601 covers the inner peripheral surface of the screen 221 that faces the defibrating chamber 210, thereby blocking the openings of the through holes 222 on the defibrating chamber 210 side.

[0080] In this embodiment, the dimension of the blocking member 601 in the Y-axis direction is the same as the dimension of the discharge path 310 in the Y-axis direction. The dimension of the blocking member 601 in the X-axis direction is greater than the dimension of the opening edge portion 315 of the discharge portion 314 in the X-axis direction.

[0081] 14 , the angle formed between the line segment connecting the axis AR and the +X direction end of the closing member 601 and the line segment connecting the axis AR and the +X direction end of the opening edge 315 is θ. The angle formed between the line segment connecting the axis AR and the −X direction end of the closing member 601 and the line segment connecting the axis AR and the −X direction end of the opening edge 315 is θ. Therefore, the position of the +X direction end of the closing member 601 is located on the +X direction side by the angle θ with respect to the position of the +X direction end of the opening edge 315. The position of the −X direction end of the closing member 601 is located on the −X direction side by the angle θ with respect to the position of the −X direction end of the opening edge 315. In this embodiment, the angle θ is set to, for example, 5° to 15°.

[0082] In the screen 221, the through holes 222 provided in the area whose outer peripheral surface is covered by the closing member 601 do not connect the defibrating chamber 210 and the discharge path 310. In other words, in the screen 221, no communication holes Ch are provided in the area whose outer peripheral surface is covered by the closing member 601. Furthermore, in this embodiment, in the screen 221, no communication holes Ch are provided in the area between the center of the discharge section 314 and the rotation shaft 501 in the Z-axis direction.

[0083] Furthermore, when the opening edge 315 of the discharge portion 314 is projected onto the screen 221 using a line segment that is perpendicular to the axis AR and that connects the axis AR to the center of the discharge portion 314 as a projection line segment and a direction along the projection line segment as a projection direction, in this embodiment, no communication hole Ch is provided in the area surrounded by the opening edge 315 projected onto the screen 221. Note that in this embodiment, the projection direction is a direction along the Z-axis direction. Furthermore, the area surrounded by the opening edge 315 projected onto the screen 221 is an example of an opposing area on the screen 221 that faces the discharge portion 314.

[0084] Furthermore, when a line segment that is perpendicular to the axis AR and that connects the axis AR with the opening edge 315 of the discharge portion 314 is defined as an imaginary line segment LD, and an area surrounded by the imaginary line segment LD on the screen 221 is defined as an area RD, in this embodiment, no communication holes Ch are provided in the area RD. The area RD is an example of an opposing area on the screen 221 that faces the discharge portion 314.

[0085] As a result, when the area other than the area RD in the screen 221 is defined as an area ERD (not shown), the area RD has a smaller number of communication holes Ch provided per unit area than the area ERD. Also, when the area in the screen 221 where the distance W between the outer peripheral wall 351 is the narrowest distance W1 is defined as an area RN, and the area in the screen 221 other than the area RN is defined as an area ERN (not shown), the area RN has a larger number of communication holes Ch provided per unit area than the area ERN.

[0086] Furthermore, the region RN has a larger number of communication holes Ch per unit area than the region RD. In this embodiment, the region RN and the region in the discharge path 310 where the spacing W is the narrowest, W1, are located in the -Z direction, vertically above the axis AR. Therefore, the region RN is an example of the region of the screen 221 that is farthest from the discharge portion 314 in the circumferential direction CR.

[0087] In this embodiment, the outer peripheral surface of the screen 221 is covered with the blocking member 601, thereby forming an area on the screen 221 where no through holes 222 connecting the defibrating chamber 210 and the discharge path 310 are provided. However, in the screen 221 of this embodiment, by not forming through holes 222 in the area of ​​the outer peripheral surface covered with the blocking member 601, an area on the screen 221 where no through holes 222 connecting the defibrating chamber 210 and the discharge path 310 are provided may also be formed.

[0088] Next, we will explain the operation of the defibration device 200. The defibration device 200 uses airflow to guide the raw material MA supplied to the defibration chamber 210 into the gap between the rotary blades 503 of the rotating rotor 500 and the screen 221, and dry-type defibration processes the raw material MA.

[0089] In this embodiment, as shown in Figure 4, raw material MA fed from the supply pipe 20 of the defibration device 200 is introduced into the defibration chamber 210 through the supply unit 214. In the defibration chamber 210, the rotating shaft 501 is rotationally driven to rotate the rotor 500. Additionally, negative pressure is applied to the discharge path 310 by the suction unit 35 via the discharge pipe 30. As a result, airflow is generated in the defibration chamber 210, discharge path 310, and discharge pipe 30, as shown by the dashed arrows in Figure 4.

[0090] This airflow sends the raw material MA into the gap between the tip of the rotary blade 503 and the screen 221. The raw material MA sent into this gap flies due to the centrifugal force from the rotor 500, and collides with the screen 221, where it is loosened and defibrated. That is, in the defibrating chamber 210, the raw material MA is defibrated to produce defibrated material.

[0091] The defibrated material produced in the defibrating chamber 210 passes through the through holes 222 of the screen 221 due to the airflow and flows into the discharge path 310. The defibrated material that flows into the discharge path 310 moves to the discharge pipe 30 through the discharge section 314 due to the airflow, 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 section 35 and the pressure inside the discharge section 314, discharge path 310, and defibrating chamber 210, which are upstream of the discharge pipe 30. For example, the airflow that passes through the through holes 222 of the screen 221 is generated by the pressure difference between the negative pressure from the suction section 35 acting on the discharge path 310 and the pressure in the defibrating chamber 210.

[0092] In the discharge path 310, it is difficult to ensure airflow near the inner surface of the discharge path 310 defined by inner surfaces 355 and 356 of the housings 311, 312, and 313, compared to near the center in the Y-axis direction of the discharge path 310. For this reason, there is a risk that the defibrated material discharged from the defibrating chamber 210 to the discharge path 310 will stagnate near the inner surface of the discharge path 310.

[0093] In the present embodiment, in the screen 221, the through-hole row 224 is provided at a position where the discharge path side opening edge 228 of the communication hole Ch forming the through-hole row 224 overlaps with the inner surface 355 when viewed from the radial direction RR. This makes it easy to ensure an airflow along the inner surface 355, and can prevent defibrated material from accumulating near the inner surface 355. Furthermore, the discharge path side opening edge 228 of the communication hole Ch forming the through-hole row 225 is provided at a position where it overlaps with the inner surface 356 when viewed from the radial direction RR. This makes it easy to ensure an airflow along the inner surface 356, and can prevent defibrated material from accumulating near the inner surface 356.

[0094] Furthermore, in the discharge path 310, negative pressure by the suction unit 35 is likely to act on the area close to the discharge section 314. As a result, the flow rate of air passing from the defibrating chamber 210 toward the discharge path 310 is likely to increase in the through holes 222 provided in the area close to the discharge section 314. Furthermore, the flow velocity of the air passing from the defibrating chamber 210 toward the discharge path 310 is likely to increase in the through holes 222 provided in the area close to the discharge section 314. In this case, there is a risk that insufficiently defibrated material will be discharged into the discharge path 310 in the through holes 222 provided in the area close to the discharge section 314. There is also a risk that the defibrated material will become clogged in the through holes 222.

[0095] Furthermore, in the through holes 222 provided in the area close to the discharge section 314, when the flow rate of air passing from the defibrating chamber 210 toward the discharge path 310 increases, negative pressure by the suction section 35 is less likely to act in the area far from the discharge section 314. As a result, the flow rate of the air passing from the defibrating chamber 210 toward the discharge path 310 tends to decrease in the through holes 222 provided in the area far from the discharge section 314. In areas where the flow rate of the air passing through the through holes 222 of the screen 221 is low, the defibrated material is less likely to pass through the through holes 222. As a result, the time of retention in the defibrating chamber 210 increases, resulting in an increase in over-defibrated defibrated material.

[0096] 15, for example, in the present embodiment, the area of ​​the discharge channel 310 that includes the discharge section 314 is referred to as the downstream discharge channel 310D, which is an area close to the discharge section 314, and the area other than the downstream discharge channel is referred to as the upstream discharge channel 310U, which is an area far from the discharge section 314. Furthermore, in the screen 221, the area that constitutes the downstream discharge channel 310D is referred to as the downstream screen 221D, and the area that constitutes the upstream discharge channel 310U is referred to as the upstream screen 221U. When the through holes 222 that communicate between the defibrating chamber 210 and the discharge channel 310 are referred to as the communicating holes Ch, the downstream screen 221D has a smaller number of communicating holes Ch provided per unit area than the upstream screen 221U.

[0097] In other words, when comparing the downstream screen 221D and the upstream screen 221U of the same area, the communication holes Ch are provided in the screen 221 so that air passes more little through the downstream screen 221D than through the upstream screen 221U. In this embodiment, when the blocking member 601 is provided, the downstream discharge channel 310D is a region that includes the region RD, the blocking member 601, and the discharge portion 314, and the upstream discharge channel 310U is a region that includes the region RN but does not include the blocking member 601 and the discharge 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.

[0098] This makes it possible to reduce the flow rate of air passing through the through holes 222 of the downstream screen 221D from the defibrating chamber 210 toward the discharge path 310, compared to when the number of communication holes Ch provided per unit area is the same around the entire circumference of the screen 221. Also, negative pressure by the suction unit 35 is likely to act on the upstream discharge path 310U. Also, it is easy to increase the flow rate of air passing through the through holes 222 of the upstream screen 221U from the defibrating chamber 210 toward the discharge path 310. As a result, it is possible to reduce the amount of undefibrated material that has not been sufficiently defibrated and is discharged from the through holes 222 of the downstream screen 221D to the discharge path 310. Also, it is possible to reduce the amount of over-defibrated defibrated material. Also, it is easy to ensure an airflow along the inner surface of the upstream discharge path 310U, and it is possible to prevent defibrated material discharged to the upstream discharge path 310U from accumulating near the inner surfaces 355, 356.

[0099] It is also easy to reduce the pressure difference between the pressure in the downstream discharge channel 310D and the pressure in the upstream discharge channel 310U. It is also easy to reduce the speed difference between the flow velocity of the airflow passing through the through-holes 222 of the downstream screen 221D and the flow velocity of the airflow passing through the through-holes 222 of the upstream screen 221U. Therefore, it is possible to reduce the defibration variation of the defibrated material discharged to the discharge channel 310. It is also possible to prevent the defibrated material discharged to the upstream discharge channel 310U from accumulating near the inner surfaces 355, 356.

[0100] 11, the discharge path 310 is provided so as to cover the entire outside of the screen 221. The discharge section 314 is provided on the outer peripheral wall 351 of the housings 311, 312, 313 that form the discharge path 310, and opens towards the screen 221. This makes it easy to apply negative pressure by the suction section 35 to the upstream side of the discharge path 310 that is far from the discharge section 314. Therefore, it is possible to prevent over-defibrated defibrated material from being discharged to an area of ​​the screen 221 that is far from the discharge section 314, and it is possible to reduce the defibration variation of the defibrated material discharged to the discharge path 310.

[0101] 11 , in a region of discharge path 310 on the +X side of axis AR, a clockwise airflow toward discharge portion 314 can be generated, and in a region of discharge path 310 on the −X side of axis AR, a counterclockwise airflow toward discharge portion 314 can be generated. In addition, in a region of discharge path 310 that is farthest from discharge portion 314 and located in the −Z direction vertically above axis AR, a clockwise airflow toward discharge portion 314 and a counterclockwise airflow toward discharge portion 314 can be generated.

[0102] As described above, the defibrating device 200 and the sheet manufacturing apparatus 100 according to the first embodiment can provide the following effects.

[0103] The defibrator 200 comprises a rotor 500 that rotates around the axis AR of a rotation shaft 501 as the center of rotation, a defibrating chamber 210 that houses the rotor 500 and in which defibrated material is formed from raw material MA containing fibers as the rotor 500 rotates, a discharge path 310 that communicates with the defibrating chamber 210 and discharges the defibrated material from the defibrating chamber 210, an annular screen 221 that is provided in the radial direction RR of the rotor 500 with a gap between it and the rotor 500 and that defines the defibrating chamber 210, housings 311, 312, 313 that form the discharge path 310, and a plurality of through-holes 222 that are provided in the screen 221 and pass through the screen 221 in the radial direction RR. Furthermore, the discharge path 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, 313 have side walls 352, 353 extending in the circumferential direction CR, and the side walls 352, 353 have inner surfaces 355, 356 that define the discharge channel 310. Furthermore, when the through hole 222 that communicates the defibrating chamber 210 and the discharge channel 310 is defined as the communicating 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, 225, which are formed by a plurality of communicating holes Ch lined up at intervals Gh in the circumferential direction CR, and the through hole row 224 is provided at a position where the discharge channel side opening edge 228 of the communicating hole Ch overlaps with the inner surface 355 when viewed from the radial direction RR. This makes it easy to ensure airflow along the inner surface 355, and prevents defibrated material from accumulating near the inner surface 355.

[0104] The housings 311, 312, 313 have a pair of side walls 352, 353 spaced apart in the Y-axis direction by an interval D, and each side wall 352, 353 has inner surfaces 355, 356, and the screen 221 has a pair of through-hole rows 224, 225, and one of the through-hole rows 224 is provided at a position where the discharge path side opening edge 228 of the communicating hole Ch overlaps with one of the inner surfaces 355 when viewed from the radial direction RR, and the other through-hole row 225 is provided at a position where the discharge path side opening edge 228 of the communicating hole Ch overlaps with the other inner surface 356 when viewed from the radial direction RR. This makes it easy to ensure airflow along the inner surfaces 355, 356, and prevents defibrated material from accumulating near the inner surfaces 355, 356.

[0105] In the communication holes Ch of the through-hole rows 224, 225, the ratio of the opening area opening into the discharge channel 310 to the opening area opening to the discharge channel 310 side of the communication holes Ch is 50% or more. This makes it easier to ensure airflow along the inner surfaces 355, 356, and can prevent defibrated material from accumulating near the inner surfaces 355, 356.

[0106] The screen 221 has a plurality of through-hole rows 223, each having through-holes 222 arranged at an interval Gh in the circumferential direction CR, spaced apart by an interval (Py-Wh) in the Y-axis direction. The plurality of through-hole rows 223 includes a pair of through-hole rows 224, 225, and the through-holes 222 are shifted in the circumferential direction CR relative to other through-holes 222 forming adjacent through-hole rows 223. The aperture ratio is the proportion of the total opening area of ​​the through-holes 222 formed in the screen 221 to the area of ​​the screen 221 forming the discharge channel 310. For example, compared to a case where the through-holes 222 are arranged at the same position in the circumferential direction CR as other through-holes 222 forming adjacent through-hole rows 223, the above-described configuration makes it possible to increase the aperture ratio while ensuring the interval between the through-holes 222. Therefore, it is easy to ensure an airflow in the defibrating chamber 210, the through holes 222 of the screen 221, and the discharge path 310 that discharges the defibrated material toward the downstream side of the discharge path 310, and it is possible to prevent the defibrated material from accumulating in the discharge path 310, including in the vicinity of the inner surfaces 355, 356.

[0107] The through holes 222 have the same distance Gh between them and the other through holes 222 that surround the through hole 222. This allows the aperture ratio to be further increased while ensuring the distance between the through holes 222.

[0108] The dimension of screen 221 in the Y-axis direction is larger than the width dimension of discharge path 310, and housings 311, 312, and 313 form discharge path 310 by covering the outside of screen 221. This makes it easy to configure a structure in which the positions of housings 311, 312, and 313 can be adjusted in the Y-axis direction relative to screen 221.

[0109] The housings 311, 312, and 313 further include a fixing member 211 that fixes the screen 221, and are fixed to the fixing member 211 and the side wall 213 with the screen 221 sandwiched between the fixing member 211 and the side wall 213. This makes it easy to configure a structure in which the housings 311, 312, and 313 can be fixed to the fixing member 211 and the side wall 213 with the positions of the housings 311, 312, and 313 adjusted relative to the screen 221.

[0110] The defibrator 200 further comprises a discharge pipe 30 that discharges the defibrated material from the discharge path 310 when negative pressure is applied, and a discharge unit 314 that connects the discharge path 310 and the discharge pipe 30, and the housings 311, 312, 313 form an annular discharge path 310 by surrounding the outside of the screen 221 in the circumferential direction CR, and have an outer peripheral wall 351 that is spaced apart from the screen 221 in the radial direction RR, and the discharge unit 314 is provided on the outer peripheral wall 351 and opens toward the screen 221. According to this, even when the discharge path 310 is provided around the entire periphery outside the screen 221, by providing the discharge unit 314 so that it opens toward the screen 221, it is easy to apply negative pressure by the suction unit 35 to the upstream side of the discharge path 310, far from the discharge unit 314. Therefore, in the defibrating chamber 210, the through holes 222 of the screen 221, and the discharge path 310, an airflow that discharges the defibrated material toward the downstream side of the discharge path 310 is ensured, and it is possible to prevent the defibrated material from accumulating.

[0111] The sheet manufacturing apparatus 100 includes a defibrator 200, a second web forming unit 70 that forms the second web Wb2 by depositing the defibrated material discharged from the defibrator 200, and a sheet forming unit 80 that forms a sheet S containing fibers by binding the fibers contained in the second web Wb2. This allows the sheet manufacturing apparatus 100 to form the sheet S from the defibrated material formed by the defibrator 200.

[0112] The defibrating device 200 and sheet manufacturing apparatus 100 according to the above-described embodiments of the present invention are basically configured as described above, but it is of course possible to modify or omit parts of the configuration without departing from the gist of the present invention. Furthermore, the above-described embodiment and other embodiments described below can be combined with each other within the scope of not causing technical contradictions. Other embodiments will be described below.

[0113] In the above embodiment, the pair of through-hole rows 224, 225 do not have to be provided along the entire circumference of the screen 221. For example, the pair of through-hole rows 224, 225 may be provided in the region RN of the screen 221, but not in the region ERN. This may result in a larger number of communication holes Ch provided per unit area in the region RN than in the region ERN. Furthermore, for example, the pair of through-hole rows 224, 225 may be provided in the upstream screen 221U, but not in the downstream screen 221D. This may result in a larger number of communication holes Ch provided per unit area in the upstream screen 221U than in the downstream screen 221D.

[0114] In the above embodiment, the screen 221 does not have to have the pair of through-hole rows 224, 225. For example, when the defibrator 200 is placed in the sheet manufacturing apparatus 100 with the axis AR aligned vertically 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 path 310. In this case, the through-hole row 225 as a group of communicating holes does not have to be provided. That is, the screen 221 has the through-hole row 224 as a group of communicating holes.

[0115] In the above embodiment, the interval Gh between adjacent through holes 222 may be smaller than the hole diameter Wh of the through holes 222. For example, as shown in FIG. 18 , the through holes 222 may be provided in the screen 221 so as to be offset in the circumferential direction CR by half the center-to-center pitch (Gh + Wh) from other through holes 222 forming an adjacent through-hole row 224 in the Y-axis direction. In this case, at least a portion of the discharge path-side opening edge 228 of the through hole 222 overlaps with the discharge path-side opening edge 228 of the other through holes 222 surrounding the through hole 222 in either the circumferential direction CR or the Y-axis direction. This allows the aperture ratio to be increased compared to the above embodiment while maintaining the interval between the through holes 222. Furthermore, a through-hole row 226 may be provided on the +Y direction side of the through-hole row 224, in which the discharge path-side opening edge 228 of the through hole 222 overlaps with the inner surface 355 as viewed in the radial direction RR. Furthermore, a through-hole row 227 may be provided on the -Y direction side of the through-hole row 225, in a position where the discharge path side opening edge 228 of the through-hole 222 overlaps with the inner surface 356 when viewed in the radial direction RR. In this case, the through-hole rows 226 and 227 are included in the multiple through-hole rows 224. In this case, the through-hole rows 224 and 226 are an example of one communication hole group, and the through-hole rows 225 and 227 are an example of the other communication hole group.

[0116] In the above embodiment, the center-to-center pitches between the through-hole rows do not have to be the same. For example, as shown in FIG. 19 , a through-hole row 226 may be provided on the +Y direction side of the through-hole row 224, where the discharge path-side opening edges 228 of the through-holes 222 overlap with the inner surface 355 as viewed in the radial direction RR. Furthermore, a through-hole row 227 may be provided on the −Y direction side of the through-hole row 225, where the discharge path-side opening edges 228 of the through-holes 222 overlap with the inner surface 356 as viewed in the radial direction RR. In this case, the center-to-center pitch Psy between the through-hole rows 224 and 226 and between the through-hole rows 225 and 227 is smaller than the center-to-center pitch Py between the through-hole rows 224 and 226. In this case, the through-hole rows 224 and 226 are examples of one communication hole group, and the through-hole rows 225 and 227 are examples of the other communication hole group.

[0117] In the above embodiment, the opening shape of the through holes 222 does not have to be circular. For example, they may be oval shapes such as ellipses or ovals, or polygonal shapes such as triangles or rectangles. Furthermore, for example, as shown in FIG. 20 , the plurality of through holes 222 provided in the screen 221 may include through holes 222 of different shapes. In FIG. 20 , the through holes 222 forming the through hole rows 224 and 225 as the communication hole groups are oval shapes with a width Wh in the circumferential direction CR and a width 2Wh in the Y-axis direction. In this case, the center-to-center pitch Iy between the through hole rows 224 and 225 may be the same as the distance D between the side walls 352 and 353. In this case, 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. 20 may 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 have an oval shape with a width in the circumferential direction CR that is half the width Wh and a width in the Y-axis direction Wh.

[0118] In the above embodiment, the through holes 222 do not have to be offset in the circumferential direction CR with respect to other through holes 222 forming adjacent through-hole rows 224 in the Y-axis direction. That is, the multiple through holes 222 do not have to be provided in a staggered pattern in the screen 221. For example, as shown in Fig. 20 , the through holes 222 may be provided in the screen 221 in a so-called lattice pattern, in which the through holes 222 and other through holes 222 forming adjacent through-hole rows 223 are arranged at the same positions in the circumferential direction CR.

[0119] In the above embodiment, if one row of through holes 224 is arranged at a position where the discharge path side opening edge 228 of the communicating hole Ch overlaps with one inner surface 355 when viewed from the radial direction RR, and the other row of through holes 225 is arranged at a position where the discharge path side opening edge 228 of the communicating hole Ch overlaps with the other inner surface 356 when viewed from the radial direction RR, the housings 311, 312, 313 do not need to be able to move in position in the Y-axis direction relative to the screen 221 while covering the screen 221.

[0120] In the above embodiment, the plurality of through holes 222 may have the same shape, and the through holes 222 may be provided in the screen 221 so that the number of communication holes Ch provided per unit area in the screen 221 gradually increases with increasing distance from the discharge portion 314 in the circumferential direction CR. In this case, for example, a row of through holes in which the same number of through holes 222 are aligned in the Y-axis direction may be provided in the screen 221 so that the intervals between the through-hole rows become narrower with increasing distance from the discharge portion 314 in the circumferential direction CR. Furthermore, for example, a row of through holes in which the through holes 222 are aligned in the Y-axis direction may be provided in the screen 221 at equal intervals in the circumferential direction CR, and the number of through holes forming the row of through holes may increase with increasing distance from the discharge portion 314 in the circumferential direction CR. This makes it easier to apply negative pressure by the suction unit 35 to the upstream side of the discharge path 310, far from the discharge portion 314. Furthermore, it is easier to reduce the difference in flow velocity of airflow passing through the plurality of through holes 222 provided in the screen 221. Therefore, the defibration variation of the defibrated material discharged into the discharge path 310 can be reduced.

[0121] In the above embodiment, the discharge section 314 does not have to be provided on the outer peripheral wall 351. For example, the discharge section 314 may be provided on either the side wall 353 or the side wall 352 of the housing 311. Furthermore, for example, when the discharge section 314 is provided on the side wall 353, the discharge section 314 may face the screen 221, or may face the side wall 352 but not face the screen 221. In this case, the closing member 601 is provided in an area of ​​the downstream screen 221D that does not face the discharge section 314. That is, the closing member 601 covers the downstream screen 221D to close the openings of the through holes 222. Furthermore, the closing member 601 is provided on the outer peripheral surface of the downstream screen 221D that faces the discharge channel 310, and closes the openings of the through holes 222 on the outer peripheral surface side. This makes it possible to block communication between the defibrating chamber 210 and the discharge channel 310 through the through holes 222. Therefore, by changing the number of communication holes Ch provided in the downstream screen 221D, it is possible to form an area in the downstream screen 221D with fewer communication holes Ch. In this case, the multiple through holes 222 provided in the screen 221 do not need to have the same shape.

[0122] In the above embodiment, the defibrator 200 does not have to be placed in the sheet manufacturing apparatus 100 with the axis AR horizontal. In this case, the defibrator 200 may be placed in the sheet manufacturing apparatus 100 with the axis AR tilted and intersecting the horizontal direction, provided that the discharge section 314 is located at the lowest point on the outer peripheral wall 351.

[0123] In the above embodiment, the defibrator 200 does not have to be placed in the sheet manufacturing apparatus 100 with the discharge unit 314 and discharge pipe 30 positioned vertically below the axis AR. For example, the defibrator 200 may be placed in the sheet manufacturing apparatus 100 with the discharge unit 314 and discharge pipe 30 positioned vertically above the axis AR. Furthermore, for example, the defibrator 200 may be placed in the sheet manufacturing apparatus 100 with the discharge unit 314 and discharge pipe 30 aligned horizontally with the axis AR.

[0124] In the above embodiment, the distance W between the outer peripheral wall 351 and the screen 221 may narrow stepwise as the distance in the circumferential direction CR increases from the discharge portion 314. For example, when the distance W in the region of the discharge path 310 located in the −Z direction of the axis AR is distance W1 and the distance W in the region of the region of the axis AR located in the +Z direction of the axis AR is distance W3, which is wider than distance W1, the distance W in the region of the discharge path 310 connecting the region located in the −Z direction of the axis AR and the region located in the +Z direction of the axis AR may narrow stepwise from the region located in the +Z direction of the axis AR to the region located in the −Z direction of the axis AR. Alternatively, the distance W in the region of the discharge path 310 connecting the region located in the −Z direction of the axis AR and the region located in the +Z direction of the axis AR may be narrower than distance W3 but wider than distance W1.

[0125] In the above embodiment, when viewed from the -Y direction, as shown in Fig. 14 , discharge path 310 does not have to be bilaterally symmetrical, provided that a clockwise airflow toward discharge portion 314 is generated in a region of discharge path 310 on the +X direction side of discharge portion 314, and a counterclockwise airflow toward discharge portion 314 is generated in a region of discharge path 310 on the -X direction side of discharge portion 314. In this case, for example, intervals W2 and W4 may be different, or the region where interval W is narrowest may be shifted in the X-axis direction from a position on the -Z direction of axis AR. Furthermore, for example, interval D between sidewall 352 and sidewall 353 may be different between a region on the +X direction side of discharge portion 314 and a region on the -X direction side of discharge portion 314.

[0126] In the above embodiment, a fixed blade may be provided on the inner peripheral surface of the screen 221 in an area facing the rotary blade 503. The fixed blade defibrates the raw material MA introduced between the fixed blade and the rotary blade 503. In this case, the fixed blade may be fixed to the inner peripheral surface of the screen 221 with a gap between it and the tip of the rotary blade 503. As shown in FIG. 14 , when the screen 221 is viewed from the −Y direction, the fixed blade may have a pointed shape that protrudes from the screen 221 toward the rotary blade 503 and extends in the Y-axis direction. When multiple fixed blades are provided, the multiple fixed blades may be provided at intervals in the circumferential direction CR around the entire circumference of the screen 221. Alternatively, the fixed blades may be provided in an area on the inner peripheral surface of the screen 221 that is opposite the outer peripheral surface on which the blocking member 601 is provided.

[0127] In the above embodiment, the supply portion 214 does not have to be circular as long as it is a through-hole that penetrates the side wall 212 in the Y-axis direction. For example, it may be polygonal or elliptical, or may be an arc shape centered on the axis AR.

[0128] In the above embodiment, the supply unit 214 does not have to open at a position vertically above the central axis AR in the side wall 212. For example, the supply unit 214 may open at a position horizontally aligned with the central axis AR in the side wall 212.

[0129] In the above embodiment, discharge portion 314 may have a circular shape when viewed from the Z-axis direction. Furthermore, the dimension of opening edge portion 315 in the Y-axis direction does not have to be the same as the inner dimension of discharge channel 310 in the Y-axis direction. In this case, for example, the dimension of opening edge portion 315 in the Y-axis direction may be smaller than the inner dimension of discharge channel 310 in the Y-axis direction.

[0130] In the above embodiment, the dimension of the blocking member 601 in the Y-axis direction does not have to be the same as the dimension of the discharge path 310 in the Y-axis direction. For example, the dimension of the blocking member 601 in the Y-axis direction may be smaller than the dimension of the discharge path 310 in the Y-axis direction. Furthermore, the dimension of the blocking member 601 in the X-axis direction may be the same as or smaller than the dimension of the opening edge portion 315 of the discharge section 314 in the X-axis direction. Furthermore, the blocking member 601 does not have to be rectangular. For example, the blocking member 601 may be circular or oval.

[0131] In the above embodiment, the defibration device 200 does not need to be provided with the blocking member 601. In this case, the through holes 222 may be provided in region RD so that the number of through holes 222 provided per unit area in the screen 221 is smaller compared to region ERD. Alternatively, by providing the above-mentioned fixed blade on the inner peripheral surface of the screen 221 corresponding to region RD, the number of communicating holes Ch in region RD may be smaller compared to region ERD. In this case, the fixed blade is provided on the inner peripheral surface of the screen 221 that faces the defibration chamber 210, and can be said to be an example of a blocking member that blocks the openings of the through holes 222 on the inner peripheral surface side.

[0132] In the above embodiment, the housings 311, 312, 313 do not have to cover the entire outer periphery of the screen 221 in the circumferential direction CR. Furthermore, the discharge path 310 does not have to be provided around the entire periphery of the screen 221 in the circumferential direction CR. For example, in the above embodiment, the area between the outer periphery of the screen 221, which is partially covered by the housing 311, and the outer peripheral wall 351 of the housing 311 may be the discharge path 310. In this case, the through-holes 222 do not have to be provided in the area of ​​the screen 221 that is not covered by the housing 311.

[0133] In the above embodiment, the distance W between the outer peripheral wall 351 and the screen 221 may be constant in the circumferential direction CR of the screen 221. In this case, the flow path cross-sectional area of ​​the discharge channel 310 may be constant and not change in the circumferential direction CR of the screen 221.

[0134] In the above embodiment, the downstream screen 221D has a smaller number of communicating holes Ch of the same shape per unit area than the upstream screen 221U, so that when comparing the downstream screen 221D and the upstream screen 221U of the same area, it is more difficult for air to pass through the downstream screen 221D than the upstream screen 221U. Alternatively, the shapes of the communicating holes Ch may be made different between the downstream screen 221D and the upstream screen 221U, so that it is more difficult for air to pass through the downstream screen 221D than the upstream screen 221U. For example, the diameter of the communicating holes Ch provided in the downstream screen 221D may be smaller than that of the upstream screen 221U, so that when comparing the downstream screen 221D and the upstream screen 221U of the same area, it is more difficult for air to pass through the downstream screen 221D than the upstream screen 221U. 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. [Explanation of symbols]

[0135] 2, 3, 7, 8, 54...pipe, 9...hopper, 10...storage and supply section, 12...crushing section, 14...crushing blade, 20...supply pipe, 30...discharge pipe, 35...suction section, 40...sorting section, 41...drum section, 42...inlet, 43...storage section, 44...discharge outlet, 45...first web forming section, 46...mesh belt, 47, 47a...tension roller, 48...suction section, 49...rotating body, 49a...base, 49b...projection, 50...mixing section, 52...additive supply section, 52a... Additive cartridge, 56...mixing blower, 60...accumulation section, 61...drum section, 63...storage section, 70...second web forming section, 72...mesh belt, 74...tension roller, 76...suction mechanism, 78...humidity control section, 79...conveying section, 79a...mesh belt, 79b...roller, 79c...suction mechanism, 80...sheet forming section, 82...pressure section, 84...heating section, 85...calender roller, 86...heating roller, 90...cutting section, 92...first cutting section, 94...second cutting section, 96...discharge section, 100...sheet manufacturing apparatus, 200...defibrating device, 210...defibrating chamber, 211...fixing member, 212, 213...side wall, 214...supply section, 221...screen, 221D...downstream screen, 221U...upstream screen, 222...through hole, 223, 224, 225, 226, 227...through hole row, 228...discharge path side opening edge, 310...discharge path, 310D...downstream discharge path, 31 0U...upstream discharge path, 311, 312, 313...housing, 314...discharge section, 315...opening edge section, 351...outer wall, 352, 353...side wall, 355, 356...inner surface, 361...screw hole, 401, 402...support section, 500...rotating body, 501...rotating shaft, 502...base, 503...rotating blade, 504...rotating vane, 601...blocking member, F1...conveying direction, W1, W2, W3, W4...spacing, Wb1...first web, Wb2...second web.

Claims

1. a rotating body that rotates around the axis of a rotation shaft; a defibration chamber that houses the rotor and forms defibrated material from a raw material containing fibers as the rotor rotates; a discharge path that communicates with the defibrating chamber and through which the defibrated material is discharged from the defibrating chamber; a circular annular wall that is provided with a gap from the rotor in the radial direction of the rotor and defines the defibration chamber; a housing that defines the discharge path; a plurality of through holes provided in the annular wall and penetrating the annular wall in the radial direction; Equipped with The discharge passage has a width in an axial direction along the axis and extends in a circumferential direction of the annular wall, the housing has a sidewall extending in the circumferential direction, the sidewall having an inner surface defining the discharge passage; When the through hole that communicates the defibrating chamber and the discharge channel is a communication hole, and the opening edge of the through hole on the discharge channel side is a discharge channel side opening edge, the annular wall has a group of communication holes, and the group of communication holes is formed by a plurality of the communication holes arranged at intervals in the circumferential direction; the communication hole group is provided at a position where the discharge passage side opening edge of the communication hole overlaps with the inner surface when viewed from the radial direction, The housing has a pair of side walls spaced apart in the axial direction, each side wall having an inner surface; the annular wall has a pair of the communication hole groups, one of the communication hole groups is provided at a position where the discharge passage side opening edge of the communication hole overlaps with one of the inner surfaces when viewed from the radial direction, and the other of the communication hole groups is provided at a position where the discharge passage side opening edge of the communication hole overlaps with the other of the inner surfaces when viewed from the radial direction; Defibration equipment.

2. In the communication holes of the communication hole group, a ratio of an opening area of ​​the communication holes that opens into the discharge passage to an opening area of ​​the communication holes that opens to the discharge passage side is 50% or more. The defibrator according to claim 1.

3. the annular wall has a plurality of through hole rows spaced apart in the axial direction, in which the through holes are arranged at intervals in the circumferential direction, and the plurality of through hole rows includes the pair of communication hole groups, the through holes are offset in the circumferential direction relative to other through holes forming the adjacent through hole rows; The defibrator according to claim 1 or 2.

4. The through holes are spaced at the same intervals from other through holes surrounding the through hole. The defibrating device according to claim 3.

5. At least a part of an opening edge of the through hole on the discharge passage side overlaps with an opening edge of the other through hole on the discharge passage side in either the circumferential direction or the axial direction. The defibrator according to claim 4.

6. The axial dimension of the annular wall is greater than the width dimension of the discharge passage, The housing covers the outside of the annular wall to form the discharge path. The defibrator according to any one of claims 1 to 5.

7. Further provided is a fixing member that fixes the annular wall, The housing is fixed to the fixing member with the annular wall sandwiched between the housing and the fixing member. The defibrator according to claim 6.

8. a discharge pipe that discharges the defibrated material from the discharge path when negative pressure is applied; a discharge portion that communicates the discharge path with the discharge pipe; Furthermore, the housing has an outer circumferential wall that surrounds the outside of the annular wall in the circumferential direction to form an annular discharge passage and is 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. The defibrator according to any one of claims 1 to 7.

9. The defibration device according to any one of claims 1 to 8; a web forming section that forms a web by depositing the defibrated material discharged from the defibrator; a fiber body forming section that forms a fiber body containing the fibers by binding the fibers contained in the web; Equipped with Fiber manufacturing equipment.

Images