Fiber defibrator, fiber manufacturing equipment

Abstract

To solve a problem of difficulty in generating air flow for discharging a defibrated product toward a discharge part existing on downstream side of a discharge path on upstream side of the discharge path separated away from the discharge part at which the discharge path and the discharge pipe communicate in a defibrating device that discharges the defibrated product through the discharge path and the discharge pipe.SOLUTION: A defibrating device 200 has a defibrating chamber 210, a discharge path 310 that communicates with the defibrating chamber 210 and allows a defibrated product to be discharged from the defibrating chamber 210, a discharge pipe 30 that discharges the defibrated product from the discharge path 310, a discharge part 314 interconnecting the discharge path 310 and the discharge pipe 30, an annular screen 221 that demarcates the defibrating chamber 210, housings 311, 312, 313 that have outer peripheral wall 351 provided so as to be spaced away from the screen 221 and form the discharge path 310, and a plurality of open holes 222 that are provided on the screen 221 and interconnect the defibrating chamber 210 and the discharge path 310. The discharge part 314 is provided on the outer peripheral wall 351 and opens toward the screen 221.SELECTED DRAWING: Figure 11

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 raw materials to be discharged via a discharge path extending along the outside of the annular wall that defines the defibration chamber, and a discharge pipe that communicates with the discharge path. In this defibration device, the discharge path and defibration chamber are communicated with each other via multiple through-holes provided in the annular wall of the defibration chamber. Furthermore, the discharge section where the discharge path and discharge pipe communicate with each other is open in the direction in which the discharge path extends. [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, in the defibration device described in Patent Document 1, it is difficult to generate an airflow that discharges the defibrated material toward the downstream side of the discharge path on the upstream side of the discharge path away from the discharge section where the discharge path and the discharge pipe are connected, and there is a risk that the defibrated material will stagnate. [Means for solving the problem]

[0005] The defibration device comprises: a rotor that rotates around the axis of the rotating shaft as the rotation center; a defibration chamber that houses the rotor and in which defibrated material is formed from raw materials including fibers as the rotor rotates; a supply pipe that supplies the raw material to the defibration chamber; a discharge path that communicates with the defibration chamber and through which the defibrated material is discharged from the defibration chamber; a discharge pipe that is subjected to negative pressure and discharges the defibrated material from the discharge path; a discharge part that communicates the discharge path with the discharge pipe; an annular wall that is provided radially of the rotor with a gap from the rotor and defines the defibration chamber; a housing that forms the discharge path by surrounding the outside of the annular wall in the circumferential direction; a plurality of through holes that are provided in the annular wall and communicate the defibration chamber with the discharge path; and an outer peripheral wall of the housing that is annular and provided at a distance from the annular wall in the radial direction, and the discharge part is provided on the outer peripheral wall and opens toward the annular wall.

[0006] The 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 discharge pipe, 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. DETAILED DESCRIPTION OF THE INVENTION

[0008] The present invention will be described below based on embodiments. In each drawing, the same components are given the same reference numerals, and duplicated explanations will be omitted.

[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 down to 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.

[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 calender roller 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 axis AR of the rotating shaft 501 is along the Y axis. Therefore, the rotating shaft 501 extends in the Y axis direction. In other words, the defibrating device 200 is placed in the sheet manufacturing apparatus 100 in an orientation where the axis 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 protrusion 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 metal thin plate member. The screen 221 of this embodiment is formed in an annular shape by fixing a plurality of thin plate members to the fixing member 211 and the side wall 213 so that they are lined up in the circumferential direction CR. As the metal material, for example, stainless steel can be used. As shown in FIG. 8 , the screen 221 has a plurality of through holes 222 formed therein, penetrating the screen 221 in the thickness direction. In this embodiment, the plurality of through holes 222 have the same shape. The through holes 222 of 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 opening shape of the through holes 222 does not have to be circular, and may be rectangular or polygonal. The screen 221 may be formed by forming the through holes 222 in a thin plate member by punching, etching, cutting, or the like. The screen 221 may be made of a single thin plate member.

[0053] 7, 8, and 11, the plurality of through holes 222 are provided so as to be distributed in the circumferential direction CR of the screen 221. For example, in this embodiment, rows of through holes 222 aligned in the Y-axis direction are provided all around the screen 221 at equal intervals in the circumferential direction CR.

[0054] Alternatively, a through-hole row in which the through holes 222 are lined up in the Y-axis direction may be provided at several different intervals in the circumferential direction CR around the entire circumference of the screen 221. Furthermore, a through-hole group in which the through holes 222 are lined up in the Y-axis direction and the circumferential direction CR may be provided at the same intervals in the circumferential direction CR around the entire circumference of the screen 221. Furthermore, in this embodiment, the same number of through holes 222 are lined up 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.

[0055] 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.

[0056] As shown in FIGS. 4 and 9 to 14 , the housings 311, 312, and 313 are disposed to surround the outside of the screen 221 in the circumferential direction CR. The housings 311, 312, and 313 form a discharge channel 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, with the screen 221 sandwiched between them. The housings 311, 312, and 313 have an outer peripheral wall 351, a side wall 352, and a side wall 353. The outer peripheral wall 351 is disposed 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.

[0057] The outer peripheral wall 351 defines the inner peripheral surface of the discharge path 310. The side wall 352 is located on the +Y direction side of the outer peripheral wall 351 and defines the inner surface of the discharge path 310 on the +Y direction side. The side wall 353 is located on the -Y direction side of the side wall 352 and defines the inner surface of the discharge path 310 on the -Y direction side. The distance D between the side walls 352 and 353 in the Y axis direction is the inner dimension of the discharge path 310 in the Y axis direction. The discharge path 310 of this embodiment is formed in an annular shape by fixing the three housings 311, 312, and 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.

[0058] 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 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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 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 that are 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.

[0066] In the discharge path 310, negative pressure from the suction unit 35 is likely to act on the area close to the discharge section 314. As a result, the flow rate of the airflow passing from the defibrating chamber 210 towards 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 undefibrated material that has not been sufficiently defibrated will be discharged into the discharge path 310. Alternatively, there is a risk that the through holes 222 will be clogged with undefibrated material that has not been sufficiently defibrated.

[0067] In this embodiment, the blocking member 601 blocks the through holes 222 provided in the area of ​​the screen 221 close to the discharge section 314. This makes it possible to reduce the amount of undefibrated defibrated material discharged to the discharge path 310, compared to when the through holes 222 provided in the area close to the discharge section 314 are not blocked by the blocking member 601. Therefore, it is possible to reduce the defibration variation of the defibrated material discharged to the discharge path 310, compared to when the through holes 222 provided in the area close to the discharge section 314 are not blocked. Also, it is possible to reduce clogging of the through holes 222 with defibrated material, compared to when the through holes 222 provided in the area close to the discharge section 314 are not blocked.

[0068] 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 larger than the dimension of the opening edge portion 315 of the discharge portion 314 in the X-axis direction.

[0069] 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°.

[0070] In the screen 221, the through holes 222 provided in the area whose outer peripheral surface is covered by the blocking member 601 do not connect the defibrating chamber 210 and the discharge path 310. In other words, in the screen 221, the area whose outer peripheral surface is covered by the blocking member 601 does not have through holes 222 that connect the defibrating chamber 210 and the discharge path 310. Furthermore, in this embodiment, in the area of ​​the screen 221 between the center of the discharge section 314 and the rotation shaft 501 in the Z-axis direction, the through holes 222 that connect the defibrating chamber 210 and the discharge path 310 are not provided.

[0071] Furthermore, when the opening edge 315 of the discharge section 314 is projected onto the screen 221 using a line segment that is perpendicular to the axis AR and that connects the axis AR and the center of the discharge section 314 as a projection line segment and a direction along the projection line segment as a projection direction, in this embodiment, no through holes 222 that communicate between the defibrating chamber 210 and the discharge path 310 are provided in the area surrounded by the opening edge 315 projected onto the screen 221. Note that in this embodiment, the above-mentioned projection direction is a direction along the Z-axis direction.

[0072] Furthermore, when the line segment that is perpendicular to the axial center AR and connects the axial center AR and the opening edge portion 315 of the discharge section 314 is defined as a virtual line segment LD, the area surrounded by the virtual line segment LD in the screen 221 is defined as an area RD, and the through holes 222 that connect the defibrating chamber 210 and the discharge path 310 are defined as communicating holes, in this embodiment, no communicating holes are provided in the area RD.

[0073] As a result, when the area of ​​the screen 221 other than the area RD is designated as an area ERD (not shown), the area RD has a smaller number of the above-described communication holes per unit area than the area ERD. Furthermore, when the area of ​​the screen 221 in which the distance W between the outer peripheral wall 351 and the area RN is the narrowest distance W1 is designated as an area RN, and the area of ​​the screen 221 other than the area RN is designated as an area ERN (not shown), the area RN has a larger number of the above-described communication holes per unit area than the area ERN. Furthermore, when the aperture ratio is defined as the ratio of the total opening area of ​​the above-described communication holes in the area R of the screen 221 to the area of ​​the area R, the area RN can also be said to have a higher aperture ratio than the area RD. In this embodiment, the area RN and the area of ​​the discharge channel 310 in which the distance W is the narrowest distance W1 are located in the -Z direction, vertically above the axis AR.

[0074] In this embodiment, by covering the outer peripheral surface of the screen 221 with the blocking member 601, an area is formed 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 by the blocking member 601, an area may be formed on the screen 221 where no through holes 222 connecting the defibrating chamber 210 and the discharge path 310 are provided.

[0075] 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 performs dry defibration processing on the raw material MA.

[0076] 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.

[0077] 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.

[0078] The defibrated material that has been defibrated in the defibrating chamber 210 to the extent that it can pass through the through holes 222 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 has flowed into the discharge path 310 moves by the airflow to the discharge pipe 30 through the discharge section 314, 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.

[0079] If the negative pressure from the suction unit 35 does not act uniformly on the discharge path 310, the flow speed of the airflow passing through the through holes 222 of the screen 221 will vary. As a result, there will be greater variation in the defibration of the defibrated material discharged from the defibration chamber 210 to the discharge path 310. For example, in the discharge path 310, in areas where the acting negative pressure is small and the flow speed of the airflow passing through the through holes 222 of the screen 221 is slow, the retention time in the defibration chamber 210 will be long and there will be more over-defibrated defibrated material. On the other hand, in areas where the acting negative pressure is large and the flow speed of the airflow passing through the through holes 222 of the screen 221 is fast, the retention time in the defibration chamber 210 will be short and there will be more insufficiently defibrated defibrated material.

[0080] 11, the discharge path 310 is provided so as to cover the entire outside of the screen 221. Furthermore, 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.

[0081] 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.

[0082] As described above, the defibrating device 200 and the sheet manufacturing apparatus 100 according to the first embodiment can provide the following effects.

[0083] The defibrator 200 comprises a rotor 500 that rotates around the axis AR of a rotating 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 supply pipe 20 that supplies raw material MA to the defibrating chamber 210, a discharge path 310 that communicates with the defibrating chamber 210 and through which the defibrated material is discharged from the defibrating chamber 210, a discharge pipe 30 that is applied with negative pressure and discharges the defibrated material from the discharge path 310, a discharge section 314 that communicates between the discharge path 310 and the discharge pipe 30, and a space between the rotor 500 and the supply pipe 20. the housing 311, 312, 313 has an annular outer wall 351 that is spaced apart from the screen 221 in the radial direction RR, and defines the defibrating chamber 210; housings 311, 312, 313 that form the discharge channel 310 by surrounding the outside of the screen 221 in the circumferential direction CR; a plurality of through holes 222 that are provided in the screen 221 and connect the defibrating chamber 210 and the discharge channel 310; and an outer circumferential wall 351 that the housings 311, 312, 313 have and is spaced apart from the screen 221 in the radial direction RR, and the discharge section 314 is provided on the outer circumferential wall 351 and opens toward the screen 221. According to this, even when the discharge channel 310 is provided around the entire periphery outside the screen 221, by providing the discharge section 314 so that it opens toward the screen 221, it is easy to apply negative pressure by the suction section 35 to the upstream side of the discharge channel 310 that is far from the discharge section 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.

[0084] In the circumferential direction CR of the screen 221, the distance W between the outer peripheral wall 351 and the screen 221 gradually decreases as it gets farther away from the discharge section 314. This makes it possible to reduce the pressure difference inside the discharge channel 310. Also, it is easy to increase the average flow velocity of the airflow in the area of ​​the discharge channel 310 farthest from the discharge section 314. Also, it is possible to bring the central area where the airflow velocity is highest in the flow path cross section of the discharge channel 310 closer to the screen 221. Therefore, it is possible to prevent the defibrated material from accumulating in the discharge channel 310. Also, by applying negative pressure by the suction section 35 uniformly inside the discharge channel 310, it is possible to reduce defibration variations such as under-defibration and over-defibration of the defibrated material.

[0085] The through holes 222 are distributed in the circumferential direction CR of the screen 221. This allows the defibrated material formed in the defibrating chamber 210 to be efficiently discharged from the screen 221 to the discharge path 310.

[0086] The rotating body 500 is housed in the defibrating chamber 210 so that the axis AR intersects with the Z-axis direction, and the discharge section 314 is provided at the lowest position on the outer peripheral wall 351. With this, gravity acting on the defibrated material can be made to act on the defibrated material discharged to the discharge path 310 as a force toward the discharge section 314. Therefore, the defibrated material in the discharge path 310 can be efficiently discharged from the discharge path 310 toward the discharge pipe 30.

[0087] When a line segment that is perpendicular to the axis AR and that connects the axis AR and the opening edge 315 of the discharge section 314 is defined as an imaginary line segment LD, the area of ​​the screen 221 that is surrounded by the imaginary line segment LD is defined as an area RD, and the area of ​​the screen 221 other than area RD is defined as an area ERD, and the multiple through holes 222 have the same shape, and of the through holes 222, those that connect the defibrating chamber 210 and the discharge channel 310 are defined as communicating holes, area RD has a smaller number of communicating holes provided per unit area than area ERD. This makes it easier to apply negative pressure by the suction section 35 to the upstream side of the discharge channel 310 that is far from the discharge section 314. Therefore, in the screen 221, it is possible to prevent over-defibrated defibrated material from being discharged to an area far from the discharge section 314, and it is possible to reduce the defibration variation of the defibrated material discharged to the discharge channel 310. Additionally, 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, making it possible to prevent the defibrated material from accumulating.

[0088] In the screen 221, when the area where the distance W between the outer peripheral wall 351 is the narrowest is defined as area RN, and the area in the screen 221 other than area RN is defined as area ERN, area RN has a larger number of communication holes provided per unit area than area ERN. According to this, it is easy to increase the flow rate of the airflow passing through the through holes 222 in area RN of the screen 221. Therefore, it is possible to prevent over-defibrated defibrated material from being discharged in area RN of the screen 221, and reduce the defibration variation of the defibrated material discharged to the discharge path 310. Also, 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 stagnating.

[0089] The communication holes are not provided in the region RD. 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 unit 314. Therefore, in the defibrating chamber 210 and the discharge path 310, an airflow that discharges the defibrated material toward the downstream side of the discharge path 310 can be secured, and stagnation of the defibrated material can be suppressed. Also, compared to when the through holes 222 are provided in the region RD, it is possible to reduce defibration variations caused by an increase in undefibrated material.

[0090] The defibration device 200 further includes a sidewall 212 that defines the defibration chamber 210, and the sidewall 212 is provided with a support portion 401 that supports the rotating shaft 501, and a supply portion 214 that connects the supply pipe 20 and the defibration chamber 210, and the supply portion 214 opens at a position on the sidewall 212 that is farther from the discharge portion 314 than the axis AR. This makes it possible to increase the flow rate of the airflow from the supply portion 214 to the region RN by shortening the distance between the supply portion 214 and the region RN that is farthest from the discharge portion 314 in the discharge path 310. Therefore, in the defibration chamber 210 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.

[0091] 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 discharge pipe 30, 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.

[0092] 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.

[0093] 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.

[0094] 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.

[0095] In the above embodiment, the interval W between the outer peripheral wall 351 and the screen 221 in the circumferential direction CR of the screen 221 may narrow stepwise from a position closer to the discharge portion 314 to a position farther from the discharge portion 314. For example, when the interval W of the region in the discharge path 310 located in the −Z direction of the axis AR is interval W1 and the interval W of the region in the +Z direction of the axis AR is interval W3 wider than interval W1, the interval W of the region in 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 interval W of the region in 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 interval W3 but wider than interval W1.

[0096] 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.

[0097] 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.

[0098] 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.

[0099] 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 aligned horizontally with the central axis AR in the side wall 212.

[0100] 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.

[0101] 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.

[0102] In the above embodiment, the defibrating device 200 does not need to be provided with the blocking member 601. In this case, the through holes 222 may be provided in the region RD so that the number of through holes 222 provided per unit area in the screen 221 is smaller than in the region ERD. Alternatively, by providing the above-mentioned fixed blade on the inner peripheral surface of the screen 221 corresponding to the region RD, the number of through holes 222 connecting the defibrating chamber 210 and the discharge channel 310 provided per unit area in the region RD may be smaller than in the region ERD. Alternatively, the through holes 222 may be provided in the region RD so that the number of through holes 222 provided per unit area in the screen 221 is the same as in the region ERD. Alternatively, the through holes 222 may be provided in the region RD so that the number of through holes 222 provided per unit area in the screen 221 is the same as in the region RN. [Explanation of symbols]

[0103] 2, 3, 7, 8, 54... pipe, 9... hopper, 10... storage and supply section, 12... coarse crushing section, 14... coarse crushing blade, 20... supply pipe, 30... discharge pipe, 35... suction section, 40... sorting section, 41... drum section, 42... inlet, 43... storage section, 44... discharge port, 45... first web forming section, 46... mesh belt, 47, 47a... tension roller, 48... suction section, 49... rotating body, 49a... base, 4 9b...protrusion, 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, 222...through hole, 310...discharge Outlet path, 311, 312, 313...housing, 314...discharge section, 315...opening edge section, 351...outer wall, 352, 353...side wall, 401, 402...support section, 500...rotating body, 501...rotating shaft, 502...base, 503...rotating blade, 504...rotating feather, 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; The rotor is housed, and as the rotor rotates, defibrated material is formed from raw materials containing fibers. and a defibration chamber. a supply pipe for supplying the raw material to the defibration chamber; a discharge path that communicates with the defibrating chamber and through which the defibrated material is discharged from the defibrating chamber; 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; A circular groove is provided in the radial direction of the rotor with a gap therebetween, which defines the defibrating chamber. an annular annular wall; a housing that circumferentially surrounds the outside of the annular wall to form the discharge passage; a plurality of through holes provided in the annular wall, the through holes communicating the defibrating chamber and the discharge path; The housing has an outer peripheral wall, which is spaced apart from the annular wall in the radial direction. The annular outer peripheral wall, Equipped with the discharge portion is provided on the outer peripheral wall and opens toward the annular wall, The radial distance between the outer peripheral wall and the annular wall is gradually decreasing in both directions along the length of the nozzle as it moves away from the discharge portion; Defibration equipment.

2. The through holes are distributed in the circumferential direction of the annular wall. The defibrator according to claim 1.

3. The rotor is accommodated in the defibrating chamber so that the axis intersects with the vertical direction, The discharge portion is provided at the lowest position on the outer peripheral wall. The defibrating device according to claim 1 or 2.

4. A line segment that is perpendicular to the axis and connects the axis and the opening edge of the discharge portion is called a virtual line segment LD In the annular wall, a region surrounded by the virtual line segment LD is defined as a region RD, and In the wall, a region other than the region RD is defined as a region ERD, The plurality of through holes have the same shape, and among the through holes, the defibrating chamber and the discharge path When the through hole communicating with the above is a communicating hole, The region RD has a smaller number of the communicating holes provided per unit area than the region ERD. There are few The defibrator according to any one of claims 1 to 3.

5. In the annular wall, a region where the gap between the annular wall and the outer peripheral wall is narrowest is defined as a region RN, In the annular wall, when a region other than the region RN is defined as a region ERN, the region RN is defined as follows: The number of the communication holes provided per unit area is larger than that of the region ERN. The defibrator according to claim 4.

6. The region RD is not provided with the communication hole. The defibrator according to claim 4 or claim 5.

7. Further comprising a side wall defining the fiberizing chamber; The side wall is provided with a support portion for supporting the rotary shaft and a feed pipe for connecting the supply pipe and the defibrating chamber. a supply unit, The supply portion is located on the side wall at a position farther from the discharge portion than the axis. Open your mouth, The defibrating device according to any one of claims 1 to 6.

8. The defibrator according to any one of claims 1 to 7; A web is formed by depositing the defibrated material discharged from the discharge pipe. With Naribe, The fibers contained in the web are bound together to form a fibrous body containing the fibers. a body forming part; Equipped with Fiber manufacturing equipment.

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