Defibrating device, fiber body manufacturing device

Abstract

The present application provides a kind of defiberizing device, fiber body manufacturing device.In defiberizing device (200), in the region of discharge passage (310) including discharge part (314) is set to downstream side discharge passage (310D), the region except downstream side discharge passage (310D) is set to upstream side discharge passage (310U), the region of screen (221) that constitutes downstream side discharge passage (310D) is set to downstream side screen (221D), the region that constitutes upstream side discharge passage (310U) is set to upstream side screen (221U), and the through hole (222) that is communicated to defiberizing chamber (210) and discharge passage (310) is set to communication hole (Ch), when, in the manner that air is more difficult to pass through downstream side screen (221D) than upstream side screen (221U), communication hole (Ch) is arranged on screen (221).

Description

TECHNICAL FIELD

[0001] The present application relates to a defibration device, a fiber body manufacturing device. BACKGROUND

[0002] In Patent Document 1, a defibration device is disclosed, which discharges defibrated material formed from a raw material via an exhaust passage and an exhaust pipe by rotating a rotating body housed in a defibration chamber, wherein the exhaust passage extends along the outside of a ring-shaped wall that defines the defibration chamber, and the exhaust pipe communicates with the exhaust passage. In this defibration device, the exhaust passage communicates with the defibration chamber through a plurality of through-holes provided on the ring-shaped wall of the defibration chamber. Further, the defibrated material formed in the defibration chamber passes through the through-holes by an air current generated by a pressure difference between the pressure in the defibration chamber and the pressure in the exhaust passage, and is discharged to the exhaust passage.

[0003] However, in the defibration device described in Patent Document 1, it is easy to increase the pressure difference between the pressure of the downstream-side exhaust passage including the exhaust portion communicated by the exhaust passage and the exhaust pipe, and the pressure of the upstream-side exhaust passage away from the exhaust portion. As a result, it is easy to increase the speed difference between the flow rate of the air current passing through the through-holes of the downstream-side ring-shaped wall constituting the downstream-side exhaust passage and the flow rate of the air current passing through the through-holes of the upstream-side ring-shaped wall constituting the upstream-side exhaust passage. Therefore, it is possible to cause the degree of defibration of the defibrated material discharged to the exhaust passage to deviate.

[0004] Patent Document 1: Japanese Patent Application Publication No. 2020-158944 SUMMARY

[0005] The defibrillation device includes: a rotating body that rotates around an axis of a rotating shaft as a center; a defibrillation chamber that houses the rotating body and forms defibrillation material from a raw material containing fibers by rotation of the rotating body; a supply pipe that supplies the raw material to the defibrillation chamber; a discharge passage that communicates with the defibrillation chamber and discharges the defibrillation material from the defibrillation chamber; a discharge pipe to which negative pressure is applied to discharge the defibrillation material from the discharge passage; a discharge portion that communicates the discharge passage with the discharge pipe; a circular ring-shaped annular wall that is provided so as to have a gap with the rotating body in a radial direction of the rotating body and defines the defibrillation chamber; a housing that forms the discharge passage extending in a circumferential direction of the annular wall by covering an outer side of the annular wall; a plurality of through holes that are provided in the annular wall and communicate the defibrillation chamber with the discharge passage; and an outer peripheral wall that is the outer peripheral wall of the housing and is provided so as to have a gap with the annular wall in the radial direction, the discharge portion being provided in the housing, when a region of the discharge passage including the discharge portion is set as a downstream side discharge passage and a region other than the downstream side discharge passage is set as an upstream side discharge passage, a region of the annular wall constituting the downstream side discharge passage is set as a downstream side annular wall and a region constituting the upstream side discharge passage is set as an upstream side annular wall, and the through holes that communicate the defibrillation chamber with the discharge passage are set as communication holes, the communication holes are provided in the annular wall in such a manner that air is less likely to pass through at the downstream side annular wall than at the upstream side annular wall when the downstream side annular wall and the upstream side annular wall of the same area are compared.

[0006] The fiber body manufacturing device includes the defibrillation device described above, a mat forming portion that forms a mat by piling the defibrillation material discharged from the discharge pipe, and a fiber body forming portion that forms a fiber body containing the fibers by bonding the fibers contained in the mat together. BRIEF DESCRIPTION OF DRAWINGS

[0007] Figure 1 A schematic view showing a structure of a sheet manufacturing device as one embodiment of the present disclosure.

[0008] Figure 2 A side view when the defibrillation device of one embodiment of the present disclosure is viewed from the -X direction side.

[0009] Figure 3 A side view when the defibrillation device is viewed from the -Y direction side.

[0010] Figure 4 A schematic view showing Figure 3The sectional view of section d4-d4 shown.

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

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

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

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

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

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

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

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

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

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

[0021] Figure 15 A cross-sectional view showing the specifications of the discharge channel and the screen. Detailed Implementation

[0022] The present invention will now be described based on embodiments. Identical components will be labeled with the same symbols in the accompanying drawings, and repeated descriptions will be omitted. Furthermore, in this specification, "identical" means not only completely identical, but also includes cases where the components are identical considering measurement errors, cases where the components are identical considering manufacturing deviations, and cases where the components are identical to the same extent without impairing functionality. Therefore, for example, "the dimensions of both are identical" means that, considering measurement errors and manufacturing deviations, the dimensional difference between the two is within ±10%, more preferably within ±5%, and particularly preferably within ±3% of the dimension of one of the components.

[0023] Furthermore, in the accompanying drawings, X, Y, and Z represent three mutually orthogonal spatial axes. In this specification, the directions along these axes will be designated as the X-axis, Y-axis, and Z-axis directions. When determining the orientation, positive directions are designated as "+" and negative directions as "-", and positive and negative signs are used in the direction markings. The direction pointed to by the arrows in each drawing is designated as the "+" direction, and the opposite direction is designated as the "-" direction. Furthermore, the Z-axis direction represents the direction of gravity; the +Z direction represents vertically downwards, and the -Z direction represents vertically upwards. The plane containing the X and Y axes is designated as the XY plane, the plane containing the X and Z axes as the XZ plane, and the plane containing the Y and Z axes as the YZ plane. The XY plane is considered a horizontal plane. The three spatial axes X, Y, and Z, which do not define positive and negative directions, will be described as the X-axis, Y-axis, and Z-axis.

[0024] 1. Implementation Method 1

[0025] The structure of the sheet manufacturing apparatus 100 according to Embodiment 1 will be described. The sheet manufacturing apparatus 100 performs a regeneration process that fibersizes the fiber-containing raw material MA and regenerates it into a new sheet S. The sheet manufacturing apparatus 100 is an example of a fiber body manufacturing apparatus. Furthermore, the sheet S is an example of a fiber body.

[0026] like Figure 1 As shown, the sheet manufacturing apparatus 100 includes a receiving and supplying section 10, a coarse crushing section 12, a fiber debonding device 200, a screening section 40, a first sheet forming section 45, a rotating body 49, a mixing section 50, a stacking section 60, a second sheet forming section 70, a conveying section 79, a sheet forming section 80, and a cutting section 90.

[0027] The receiving and supplying section 10 is an automatic feeding device that receives raw material MA and continuously feeds it into the coarse crushing section 12. The raw material MA only needs to be a fibrous material, such as old paper, waste paper, or pulp flakes.

[0028] The coarse crushing section 12 is equipped with coarse crushing blades 14 that cut the raw material MA supplied by the receiving and supplying section 10, and cuts the raw material MA in the air by the coarse crushing blades 14 to make it into fragments several centimeters square. The coarse crushing section 12 can be, for example, a shredder. The raw material MA cut in the coarse crushing section 12 is collected by the hopper 9 and conveyed through the pipe 2 to the supply pipe 20 of the fiber-removing device 200.

[0029] Coarse fragments are conveyed from the coarse fragmentation section 12 to the defiberization device 200 by airflow. In the defiberization device 200, coarse fragments are supplied from the supply pipe 20 to the defiberization chamber 210, which will be described later, and the coarse fragments are defibered by rotating the rotating body 500 housed in the defiberization chamber 210.

[0030] A suction portion 35 is provided on the pipe 3 to which the discharge pipe 30 is connected. The suction portion 35 is provided with a blower that can apply negative pressure to the discharge pipe 30 by sucking air on the discharge pipe 30 side in the pipe 3. The defibrated product of the defibration chamber 210 is discharged from the defibration device 200 through the discharge passage 310 and the discharge pipe 30 by the air current generated by the negative pressure applied to the discharge pipe 30. The defibrated product discharged from the defibration device 200 is transferred to the screening portion 40 through the pipe 3 to which the discharge pipe 30 is connected. The structure of the defibration device 200 will be described later.

[0031] The screening portion 40 screens the components contained in the defibrated product according to the size of the fiber. The screening portion 40 has a drum portion 41 and a housing portion 43 that houses the drum portion 41. The drum portion 41 uses, for example, a sieve.

[0032] The defibrated product introduced into the inside of the drum portion 41 from the guide inlet 42 is separated into a through product that passes through the opening of the drum portion 41 and a residual product that does not pass through the opening by the rotation of the drum portion 41. The first screened product that has passed through the opening falls toward the first web forming portion 45 inside the housing portion 43.

[0033] In addition, the second screened product that has not passed through the opening is again fed to the supply pipe 20 of the defibration device 200 through the pipes 8, 2 from the discharge outlet 44 that communicates with the inside of the drum portion 41.

[0034] The first web forming portion 45 is provided with a mesh belt 46, a plurality of set rollers 47, 47a, and a suction portion 48. The mesh belt 46 is a jointless belt and is set on the plurality of set rollers 47, 47a. The mesh belt 46 rotates around the track formed by the set rollers 47, 47a. A part of the track of the mesh belt 46 is flat at the lower side of the drum portion 41, so that the mesh belt 46 forms a flat surface. The suction portion 48 corresponds to a suction mechanism.

[0035] A plurality of openings are formed in the mesh belt 46. The components of the first screened product that fall from the drum portion 41 above the mesh belt 46 that are larger than the openings of the mesh belt 46 are accumulated on the mesh belt 46. In addition, the components of the first screened product that are smaller than the openings of the mesh belt 46 pass through the openings.

[0036] The suction portion 48 is provided with a blower not shown and sucks air from the side opposite to the drum portion 41 with respect to the mesh belt 46. The components that have passed through the openings of the mesh belt 46 are sucked in by the suction portion 48. The air current sucked by the suction portion 48 has an effect of promoting the accumulation by bringing the first screened product that has fallen from the drum portion 41 close to the mesh belt 46.

[0037] The components accumulated on the web 46 become a sheet shape, thereby constituting a first sheet Wbl. The basic structure of the web 46, the nip rollers 47, 47a, and the suction portion 48 is the same as that of the web 72, the nip rollers 74, and the suction mechanism 76 of the second sheet forming portion 70 described later.

[0038] The first sheet Wbl is transported to the rotating body 49 in conjunction with the movement of the web 46.

[0039] The rotating body 49 has a base portion 49a linked to a not-shown driving portion such as a motor, and a protruding portion 49b protruding from the base portion 49a, and the protruding portion 49b is caused to rotate with the base portion 49a as the center by causing the base portion 49a to rotate in the direction D.

[0040] The rotating body 49 is positioned at the end portion of the flat portion of the web 46 on the side of the nip roller 47a. Since the track of the web 46 is bent downward at this end portion, the first sheet Wbl transported by the web 46 protrudes from the web 46 and comes into contact with the rotating body 49. The first sheet Wbl is broken up by the protruding portion 49b colliding with the first sheet Wbl and becomes a smaller block of fibers. This block passes through the pipe 7 positioned below the rotating body 49 and is transported to the mixing portion 50.

[0041] The mixing portion 50 mixes the first screened material and the additive. The mixing portion 50 has an additive supply portion 52 that supplies the additive, a pipe 54 that transports the first screened material and the additive, and a mixing blower 56.

[0042] The additive supply portion 52 supplies the additive composed of fine powder or fine particles inside an additive cartridge 52a to the pipe 54.

[0043] The additive supplied from the additive supply portion 52 contains a resin, i.e., an adhesive, for bonding a plurality of fibers together. The resin contained in the additive is melted when passing through the sheet forming portion 80, thereby bonding a plurality of fibers together.

[0044] The mixing blower 56 causes air flow in the pipe 54 connecting the pipe 7 and the accumulation portion 60. Furthermore, the first screened material transported from the pipe 7 to the pipe 54 and the additive supplied to the pipe 54 by the additive supply portion 52 are mixed when passing through the mixing blower 56.

[0045] The accumulation portion 60 breaks up the fibers of the mixture while dispersing them in the air and drops them to the second sheet forming portion 70.

[0046] The accumulation section 60 has a drum section 61, an introduction port 62 that introduces the mixture to the drum section 61, and an accommodation section 63 that accommodates the drum section 61. The drum section 61 is, for example, a cylindrical structure that is configured in the same manner as the drum section 41, and functions as a sieve by rotating by the power of a motor not shown in the same manner as the drum section 41.

[0047] A second web forming section 70 is disposed below the drum section 61. The second web forming section 70 has, for example, a mesh belt 72, a trolley roller 74, and a suction mechanism 76.

[0048] A component of the mixture that falls from the drum section 61 above the mesh belt 72 and is larger than the opening of the mesh belt 72 is accumulated on the mesh belt 72. The component accumulated on the mesh belt 72 becomes a web shape, thereby constituting a second web Wb2.

[0049] In the conveyance path of the mesh belt 72, a humidity adjusting section 78 is provided at the downstream side of the accumulation section 60. Since the moisture content of the second web Wb2 is adjusted by the moisture supplied by the humidity adjusting section 78, it is expected that the effect of suppressing the adsorption of the fiber to the mesh belt 72 due to static electricity and the like is obtained.

[0050] The second web Wb2 is peeled from the mesh belt 72 by a conveyance section 79 and is conveyed to a sheet forming section 80. The conveyance section 79 has, for example, a mesh belt 79a, a roller 79b, and a suction mechanism 79c. The suction mechanism 79c has a blower not shown, and an upward air current passes through the mesh belt 79a by the suction force of the blower. By this air current, the second web Wb2 is peeled from the mesh belt 72 and is adsorbed on the mesh belt 79a. The mesh belt 79a is moved by the rotation of the roller 79b, thereby conveying the second web Wb2 to the sheet forming section 80.

[0051] The mesh belt 79a can be configured by a jointless belt having an opening in the same manner as the mesh belt 46 and the mesh belt 72.

[0052] The sheet forming section 80 causes the fibers contained in the second web Wb2 that originate from the first sieve to be bonded together by the resin contained in the additive by applying heat to the second web Wb2.

[0053] The sheet forming section 80 includes a pressing section 82 for pressing a second sheet Wb2, and a heating section 84 for heating the second sheet Wb2 pressed by the pressing section 82. The pressing section 82 presses the second sheet Wb2 with a predetermined clamping force using a pair of calendering rollers 85 and conveys it toward the heating section 84. The heating section 84 clamps the high-density second sheet Wb2 with a pair of heating rollers 86 to apply heat and conveys it to the cutting section 90. In the heating section 84, the resin contained in the second sheet Wb2 is heated, thereby forming a sheet S. The sheet forming section 80 is an example of a fiber forming section.

[0054] The cutting section 90 cuts the sheet S formed by the sheet forming section 80. The cutting section 90 has a first cutting section 92 and a second cutting section 94. The first cutting section 92 cuts the sheet S in a direction intersecting the conveying direction F1 of the sheet S (shown as symbol F1 in the figure), and the second cutting section 94 cuts the sheet S in a direction parallel to the conveying direction F1. The cutting section 90 cuts the sheet S to predetermined dimensions in both length and width, thereby forming a single sheet S. The sheet S cut by the cutting section 90 is stored in the discharge section 96.

[0055] Next, the structure of the defiber device 200 will be described. The defiber device 200 is a device for processing raw material MA, in which multiple fibers are bonded together, into one or a small number of fibers. The defiber device 200 is a dry defiber processing device that performs defibering and other processes in the atmosphere or air, not in a liquid.

[0056] like Figures 2 to 5 As shown, the defiberizing apparatus 200 includes a rotating body 500, a defiberizing chamber 210, a supply pipe 20, a discharge channel 310, and a discharge pipe 30. The defiberizing apparatus 200 forms defibered material from raw material MA supplied via the supply pipe 20 by rotating the rotating body 500, housed in the defiberizing chamber 210, about the axis AR of the rotating shaft 501. Furthermore, the defiberizing apparatus 200 includes a screen 221 defining the defiberizing chamber 210, a fixing member 211, and side walls 212 and 213; housings 311, 312, and 313 defining the discharge channel 310; support portions 401 and 402 supporting the rotating body 500; and a closing member 601. In the following description, the direction of rotation of the rotating shaft 501 about the axis AR is sometimes referred to as the circumferential direction CR, and the radial direction of the rotating shaft 501 is sometimes referred to as the radial direction RR.

[0057] The rotating body 500 has a rotating shaft 501, a base 502, a rotating blade 503, and a rotating vane 504. The rotating body 500 is housed in the defibrillation chamber 210 in such a manner that the shaft center AR of the rotating shaft 501 is along the Y-axis. Thus, the rotating shaft 501 extends in the Y-axis direction. In other words, the defibrillation device 200 is disposed in the sheet manufacturing device 100 in a posture in which the shaft center AR is horizontal. The base 502 is in a circular plate shape, and is fixed in such a manner that the rotating shaft 501 is inserted therethrough. The rotating blade 503 is provided in such a manner that it protrudes in the radial direction RR away from the base 502. The rotating blade 503 is in a plate-like protrusion shape. The rotating blade 503 is formed with a plurality of portions spaced apart in the circumferential direction CR.

[0058] On the +Y direction side of the base 502, the rotating vane 503 is provided with a plurality of portions spaced apart in the circumferential direction CR. Although the rotating vane 503 is formed with a plurality of portions spaced apart in the circumferential direction CR as shown in the drawing, the rotating vane 503 can be formed with a single portion. Figure 5 Although the rotating blade 503 and the base 502 are formed by laminating plate-like boards in the Y-axis direction in the present embodiment as shown in the drawing, they can be formed by a monolithic block.

[0059] As shown in the drawing, Figure 4 , Figure 6 The fixing member 211 is in a cylindrical shape. The fixing member 211 is located on the +Y direction side of the rotating blade 503 in the Y-axis direction.

[0060] As shown in the drawing, Figure 4 , Figure 10 , Figure 12 The side wall 212 is in a circular plate shape. The side wall 212 is located on the +Y direction side of the fixing member 211. The side wall 212 defines the inner surface of the +Y direction side of the defibrillation chamber 210 by being fixed to the fixing member 211. On the side wall 212, the support portion 401, the supply pipe 20, and the supply portion 214 are provided.

[0061] 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 compared to the rotating blade 503 of the rotating body 500. The support portion 401 supports the rotating shaft 501 of the rotating body 500 in such a manner that the rotating body 500 can rotate with the shaft center AR as the center of rotation. The support portion 401 supports the +Y direction side of the rotating shaft 501 of the rotating body 500 compared to the rotating blade 503.

[0062] The rotating shaft 501 is rotationally driven by a drive mechanism not shown in the drawing. In the present embodiment, the drive mechanism is constituted by a belt and a pulley, and power is transmitted from a rotationally driving source not shown in the drawing to the belt and the pulley, thereby causing the rotating body 500 to rotate with the shaft center AR as the center of rotation. Although the rotating body 500 is rotationally driven in the present embodiment in such a manner that the rotating blade 503 is always on the +Y direction side of the defibrillation chamber 210, the rotating body 500 can be rotationally driven in such a manner that the rotating blade 503 is on the -Y direction side of the defibrillation chamber 210. Figure 11The rotating body 500 rotates counterclockwise around the axis AR as a center, but it can also rotate clockwise. Alternatively, the rotating body 500 can also rotate in both clockwise and counterclockwise directions around the axis AR as a center. Figure 11 The rotating body 500 rotates in both clockwise and counterclockwise directions around the axis AR as a center. Furthermore, the structure that rotationally drives the rotating shaft 501 can not be a structure composed of a belt and a pulley.

[0063] The supply pipe 20 supplies the fiber-containing raw material MA to the defibration chamber 210. As shown in Figure 4 , Figure 6 , Figure 12 The supply pipe 20 is tubular. The supply pipe 20 is provided on the face of the +Y direction side of the side wall 212. The supply pipe 20 is provided on the side wall 212 at a position in the -Z direction from the axis AR that is the rotating shaft 501. The supply pipe 20 extends in the Y axis direction. The supply portion 214 is a circular through hole that penetrates the side wall 212 in the Y axis direction. The supply portion 214 communicates the supply pipe 20 with the defibration chamber 210. Therefore, the supply portion 214 opens on the side wall 212 at a position vertically above the axis AR that is the rotating shaft 501, that is, in the -Z direction. In other words, the supply portion 214 opens on the side wall 212 at a position farther from the discharge portion 314 described later than the axis AR.

[0064] As shown in Figure 4 , Figure 6 , Figure 10 The side wall 213 is circular-plate-shaped. The side wall 213 is located on the -Y direction side of the fixed member 211. Furthermore, the side wall 213 is located on the -Y direction side of the rotating blade 503 of the rotating body 500. The side wall 213 defines the inner surface of the -Y direction side of the defibration chamber 210 by being fixed to the fixed member 211 via the screen 221. On the side wall 213, the support portion 402 that supports the rotating shaft 501 of the rotating body 500 at a position on the -Y direction side compared to the rotating blade 503 is provided.

[0065] As shown in Figure 4 , Figures 6 to 9 , Figures 11 to 14 The screen 221 is thin-plate-shaped. The screen 221 is located between the fixed member 211 and the side wall 213 in the Y axis direction. The screen 221 is formed in a ring shape by being fixed to the fixed member 211 and the side wall 213. The screen 221 is provided in a manner that leaves a gap from the rotating blade 503 in the radial direction RR.

[0066] The dimension in the Y-axis direction, which is the width dimension of the screen 221, is larger than the dimension in the Y-axis direction of the rotary blade 503. In the Y-axis direction, the tip end of the rotary blade 503 is positioned within the width of the screen 221. The screen 221 defines the inner circumferential surface of the cylindrical fiberizing chamber 210 by being fixed to the fixing member 211 and the side wall 213. The screen 221 defines the region of the inner circumferential surface of the fiberizing chamber 210 that opposes the tip end of the rotary blade 503. The screen 221 is an example of a ring-shaped wall.

[0067] The screen 221 is formed of, for example, a thin plate member made of metal. The screen 221 of the present embodiment is formed in a ring shape by being fixed to the fixing member 211 and the side wall 213 in such a manner that a plurality of thin plate members are arranged along the circumferential direction CR. As the material made of metal, for example, stainless steel can be used. As shown in FIG. 6, a plurality of through-holes 222 that penetrate the screen 221 in the thickness direction are formed in the screen 221. In the present embodiment, the plurality of through-holes 222 are the same shape. The through-holes 222 of the present embodiment are circular holes. The hole diameter of the through-holes 222 is set to a size that can be passed through by the fiberized product that is fiberized to the desired degree. In addition, the opening shape of the through-holes 222 can not be circular, but can be rectangular or polygonal. The screen 221 can be formed by forming the through-holes 222 in the thin plate member using punching processing, etching processing, cutting processing, or the like. In addition, the screen 221 can be formed of one thin plate member. Figure 8 As shown in FIG. 6, a plurality of through-holes 222 that penetrate the screen 221 in the thickness direction are formed in the screen 221. In the present embodiment, the plurality of through-holes 222 are the same shape. The through-holes 222 of the present embodiment are circular holes. The hole diameter of the through-holes 222 is set to a size that can be passed through by the fiberized product that is fiberized to the desired degree. In addition, the opening shape of the through-holes 222 can not be circular, but can be rectangular or polygonal. The screen 221 can be formed by forming the through-holes 222 in the thin plate member using punching processing, etching processing, cutting processing, or the like. In addition, the screen 221 can be formed of one thin plate member.

[0068] As shown in FIG. 6, a plurality of through-holes 222 that penetrate the screen 221 in the thickness direction are formed in the screen 221. In the present embodiment, the plurality of through-holes 222 are the same shape. The through-holes 222 of the present embodiment are circular holes. The hole diameter of the through-holes 222 is set to a size that can be passed through by the fiberized product that is fiberized to the desired degree. In addition, the opening shape of the through-holes 222 can not be circular, but can be rectangular or polygonal. The screen 221 can be formed by forming the through-holes 222 in the thin plate member using punching processing, etching processing, cutting processing, or the like. In addition, the screen 221 can be formed of one thin plate member. Figure 7 、 Figure 8 、 Figure 11 As shown in FIG. 6, a plurality of through-holes 222 that penetrate the screen 221 in the thickness direction are formed in the screen 221. In the present embodiment, the plurality of through-holes 222 are the same shape. The through-holes 222 of the present embodiment are circular holes. The hole diameter of the through-holes 222 is set to a size that can be passed through by the fiberized product that is fiberized to the desired degree. In addition, the opening shape of the through-holes 222 can not be circular, but can be rectangular or polygonal. The screen 221 can be formed by forming the through-holes 222 in the thin plate member using punching processing, etching processing, cutting processing, or the like. In addition, the screen 221 can be formed of one thin plate member.

[0069] Alternatively, the multiple through holes 222 can be arranged in a through hole array in the Y-axis direction, spanning the entire circumference of the screen 221 with several different intervals in the circumferential direction CR. Furthermore, it is also possible to arrange the through holes 222 in a through hole group in both the Y-axis and circumferential directions CR, spanning the entire circumference of the screen 221 with the same intervals in the circumferential direction CR. Although in this embodiment, the same number of through holes 222 are arranged in the Y-axis direction to form a through hole array, the number of through holes forming the through hole array can vary between the through hole arrays.

[0070] When through holes 222 are formed on a thin sheet component by etching, the material of the thin sheet component can be, for example, SUS430, SUS304, SUS316L, etc. Alternatively, the screen 221 can also be a mesh constructed by weaving in metal wires. In this case, the mesh openings correspond to the through holes 222.

[0071] like Figure 4 , Figures 9 to 14 As shown, housings 311, 312, and 313 are arranged to surround the outer side of screen 221 in the circumferential direction CR. By covering the outer side of screen 221 across the entire circumference in the circumferential direction CR, housings 311, 312, and 313 form a discharge channel 310. Housings 311, 312, and 313 are fixed to fixing member 211 and side wall 213, sandwiching screen 221. Housings 311, 312, and 313 have an outer peripheral wall 351, a side wall 352, and a side wall 353. The outer peripheral wall 351 is arranged with a gap W between it and screen 221 in the radial direction RR. The outer peripheral wall 351 is annular. The gap W between the outer peripheral wall 351 and screen 221 in the radial direction RR is the internal dimension of the discharge channel 310 in the radial direction RR.

[0072] The outer peripheral wall 351 defines the inner peripheral surface of the discharge channel 310. The side wall 352 is located on the +Y direction side of the outer peripheral wall 351 and defines the inner surface of the discharge channel 310 on the +Y direction side. The side wall 353 is located on the -Y direction side of the side wall 352 and defines the inner surface of the discharge channel 310 on the -Y direction side. Furthermore, the interval D between the side walls 352 and 353 in the Y-axis direction is the internal dimension of the discharge channel 310 in the Y-axis direction. In this embodiment, the discharge channel 310 is formed into a ring shape by clamping the screen 221 onto the fixing member 211 and the side wall 213 in such a way that the three housings 311, 312, and 313 are arranged along the circumferential direction CR.

[0073] like Figure 4 , Figures 11 to 14As shown, the discharge passage 310 is provided so as to span the entire circumference of the outer side of the screen 221 in the circumferential direction CR. The discharge passage 310 extends in the circumferential direction CR of the screen 221. The discharge passage 310 communicates with the defibrating chamber 210 via the plurality of through-holes 222 provided on the screen 221. Defibrated material formed in the defibrating chamber 210 is discharged into the discharge passage 310 via the plurality of through-holes 222. In addition, the discharge passage 310 can also be formed by one housing member.

[0074] On the outer peripheral wall 351 of the housing 311, the discharge pipe 30 and the discharge portion 314 are provided. The discharge pipe 30 is provided on the +Z direction side of the outer peripheral wall 351 of the housing 311. The discharge pipe 30 is located on the +Z direction side below the axis center AR that is the rotation axis 501. Thus, the discharge pipe 30 is provided at the lowermost position on the outer peripheral wall 351. The discharge pipe 30 is tubular. The discharge pipe 30 extends in the +Z direction from the outer peripheral wall 351.

[0075] The discharge portion 314 is a through-hole that penetrates the outer peripheral wall 351 in the Z-axis direction. The discharge portion 314 has a substantially quadrangular shape when viewed from the Z-axis direction. The opening edge portion 315 is an edge that opens on the discharge passage 310 side of the discharge portion 314. The dimension of the opening edge portion 315 in the Y-axis direction is the same as the internal dimension of the discharge passage 310 in the Y-axis direction. The dimension of the opening edge portion 315 in the X-axis direction is set to 40 mm to 50 mm. The dimension of the discharge portion 314 in the Y-axis direction is the same as the internal dimension of the discharge passage 310 in the Y-axis direction.

[0076] The discharge portion 314 communicates the discharge passage 310 with the discharge pipe 30. The discharge portion 314 is provided on the outer peripheral wall 351 and opens toward the screen 221. Thus, the discharge portion 314 is provided at a position on the outer peripheral wall 351 below the axis center AR of the rotation axis 501, that is, in the +Z direction. In other words, the discharge portion 314 is provided at the lowermost position in the outer peripheral wall 351.

[0077] In the present embodiment, the interval D between the side wall 352 and the side wall 353 is the same across the entire circumference of the screen 221. The interval D is set to a predetermined dimension of, for example, 40 mm to 50 mm. On the other hand, the interval W between the outer peripheral wall 351 and the screen 221 is narrower on one side of the region that is farther away from the region opposite the discharge portion 314 in the circumferential direction CR of the screen 221 than on the other side of the region opposite the discharge portion 314.

[0078] For example, as shown in FIG. 6, the discharge pipe 30 can be provided on the outer peripheral wall 351 of the housing 311 so as to extend in the circumferential direction CR of the screen 221. Figure 14As shown, the interval W of the region in the discharge channel 310 located in the -Z direction of the axis AR is designated as interval W1, the interval W of the region in the +X direction of the axis AR is designated as interval W2, the interval W of the region in the +Z direction of the axis AR is designated as interval W3, and the interval W of the region in the -X direction of the axis AR is designated as interval W4. At this time, interval W1 is narrower than interval W3. Furthermore, intervals W2 and W4 are narrower than interval W3. Additionally, interval W1 is narrower than intervals W2 and W4. Furthermore, in this embodiment, intervals W2 and W4 are the same.

[0079] Furthermore, in this embodiment, the interval W gradually decreases along the circumferential CR of the screen 221 as it moves away from the discharge portion 314. Additionally, the interval D between sidewalls 352 and 353 is the same across the entire circumference of the screen 221. Therefore, the flow channel cross-sectional area of ​​the discharge channel 310 gradually decreases along the circumferential CR of the screen 221 as it moves away from the discharge portion 314. Furthermore, in this embodiment, for example, interval W1 is set to 5 mm, intervals W2 and W4 are set to 10 mm, and interval W3 is set to 15 mm.

[0080] like Figure 4 , Figures 11 to 14 As shown, the sealing member 601 is provided on the outer peripheral surface side of the discharge channel 310 side of the screen 221. The sealing member 601 is provided in the opposing region opposite the discharge portion 314 in the screen 221. The sealing member 601 is located on the +Z direction side of the axis AR. The sealing member 601 covers the outer peripheral surface of the discharge channel 310 side of the screen 221, thereby closing the opening of the through hole 222 on the discharge channel 310 side. The sealing member 601 closes the through hole 222 provided in the area of ​​the screen 221 near the discharge portion 314. Alternatively, the sealing member 601 may also be provided on the inner peripheral surface side of the defiber chamber 210 side of the screen 221. In this case, the sealing member 601 covers the inner peripheral surface of the defiber chamber 210 side of the screen 221, thereby closing the opening of the through hole 222 on the defiber chamber 210 side.

[0081] In this embodiment, the dimension of the sealing member 601 in the Y-axis direction is the same as the dimension of the discharge channel 310 in the Y-axis direction. The dimension of the sealing member 601 in the X-axis direction is larger than the dimension of the opening edge portion 315 in the discharge portion 314 in the X-axis direction.

[0082] In addition, such as Figure 14As shown, the angle formed between the line segment connecting the axis of revolution AR and the +X-direction end of the closed member 601 and the line segment connecting the axis of revolution AR and the +X-direction end of the opening edge portion 315 is θ. Also, the angle formed between the line segment connecting the axis of revolution AR and the -X-direction end of the closed member 601 and the line segment connecting the axis of revolution AR and the -X-direction end of the opening edge portion 315 is θ. Thus, the position of the +X-direction end of the closed member 601 is shifted to the +X-direction side by an amount of the angle θ with respect to the position of the +X-direction end of the opening edge portion 315. Also, the position of the -X-direction end of the closed member 601 is shifted to the -X-direction side by an amount of the angle θ with respect to the position of the -X-direction end of the opening edge portion 315. In the present embodiment, the angle θ is set to, for example, 5° to 15°.

[0083] The through hole 222 provided in the screen 221 in the region of the outer peripheral surface covered by the closed member 601 does not communicate the defibrillation chamber 210 and the discharge passage 310. In other words, in the region of the screen 221 in which the outer peripheral surface is covered by the closed member 601, the through hole 222 that communicates the defibrillation chamber 210 and the discharge passage 310 is not provided. Also, in the present embodiment, in the region of the screen 221 between the center of the discharge portion 314 and the rotation shaft 501 in the Z-axis direction, the through hole 222 that communicates the defibrillation chamber 210 and the discharge passage 310 is not provided.

[0084] Also, in the present embodiment, in the region surrounded by the opening edge portion 315 projected onto the screen 221, the through hole 222 that communicates the defibrillation chamber 210 and the discharge passage 310 is not provided. In the present embodiment, the projection direction described above is a direction along the Z-axis direction. Also, the region surrounded by the opening edge portion 315 projected onto the screen 221 is one example of the opposing region of the discharge portion 314 in the screen 221.

[0085] Also, in the present embodiment, in the region RD, the communication hole Ch is not provided. The region RD is one example of the opposing region of the discharge portion 314 in the screen 221.

[0086] The result is that when the area of ​​screen 221 other than region RD is designated as region ERD (not shown), the number of connecting holes Ch per unit area in region RD is less than that in region ERD. Furthermore, when the area of ​​screen 221 with the narrowest interval W between itself and the outer peripheral wall 351 is designated as region RN, and the area of ​​screen 221 other than region RN is designated as region ERN (not shown), the number of connecting holes Ch per unit area in region RN is greater than that in region ERN.

[0087] Furthermore, compared to region RD, region RN has a greater number of connecting holes Ch per unit area. Additionally, in this embodiment, region RN, and the region in the discharge channel 310 with the narrowest interval W1, are located on the -Z direction side, vertically above the axis AR. Therefore, region RN is an example of the region in the screen 221 furthest from the discharge section 314 in the circumferential direction CR.

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

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

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

[0091] The airflow thus carries the raw material MA to the gap between the tip of the rotating blade 503 and the screen 221. The raw material MA carried to the gap flies from the rotating body 500 due to a centrifugal force or the like, collides with the screen 221, and is disintegrated, thereby being defibered. That is, in the defiberizing chamber 210, the raw material MA is defibered to generate defibered material.

[0092] The defibered material generated in the defiberizing chamber 210 passes through the through-holes 222 of the screen 221 by the airflow and flows into the discharge passage 310. The defibered material flowing into the discharge passage 310 passes through the discharge portion 314 by the airflow and moves to the discharge pipe 30, and is discharged into the pipe 3 connected to the discharge pipe 30. The airflow that moves the defibered material is generated by the pressure difference between the negative pressure applied to the discharge pipe 30 by the suction portion 35 and the pressure in the discharge portion 314, the discharge passage 310, and the defiberizing chamber 210 on the upstream side 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 portion 35 and the pressure of the defiberizing chamber 210 acting on the discharge passage 310.

[0093] In the discharge passage 310, the negative pressure generated by the suction portion 35 is likely to act in a region closer to the discharge portion 314. Thus, in the through-holes 222 provided in the region closer to the discharge portion 314, the flow rate of air passing from the defiberizing chamber 210 toward the discharge passage 310 is likely to increase. Further, in the through-holes 222 provided in the region closer to the discharge portion 314, the flow rate of the airflow passing from the defiberizing chamber 210 toward the discharge passage 310 is likely to increase. In this case, there is a possibility that the defibered material that is not sufficiently defibered in the through-holes 222 provided in the region closer to the discharge portion 314 is discharged toward the discharge passage 310. Further, there is a possibility that the defibered material clogs the through-holes 222.

[0094] Further, when the flow rate of air passing from the defiberizing chamber 210 toward the discharge passage 310 in the through-holes 222 provided in the region closer to the discharge portion 314 increases, the negative pressure generated by the suction portion 35 is less likely to act on the region farther from the discharge portion 314. Thus, in the through-holes 222 provided in the region farther from the discharge portion 314, the flow rate of the airflow passing from the defiberizing chamber 210 toward the discharge passage 310 is likely to decrease. In the region where the flow rate of the airflow passing through the through-holes 222 of the screen 221 is low, the defibered material is less likely to pass through the through-holes 222. As a result, over-defibered defibered material that has stayed in the defiberizing chamber 210 for a long time and is excessively defibered is likely to increase.

[0095] In the present embodiment, for example, like Figure 15As illustrated, a region of the discharge passage 310 including the discharge portion 314 is set as a downstream side discharge passage 310D as a region closer to the discharge portion 314, and a region other than the downstream side discharge passage is set as an upstream side discharge passage 310U as a region farther from the discharge portion 314. Further, a region of the screen 221 constituting the downstream side discharge passage 310D is set as a downstream side screen 221D, and a region constituting the upstream side discharge passage 310U is set as an upstream side screen 221U. Also, when the through-hole 222 communicating the defibrating chamber 210 and the discharge passage 310 is set as the communication hole Ch, the number of the communication holes Ch provided per unit area of the downstream side screen 221D is less than that of the upstream side screen 221U.

[0096] In other words, the communication holes Ch are provided on the screen 221 in such a manner that air is less likely to pass through at the downstream side screen 221D than at the upstream side screen 221U when the same area of the downstream side screen 221D and the upstream side screen 221U are compared. Also, in the present embodiment, in the case where the blocking member 601 is provided, the downstream side discharge passage 310D is a region including the region RD, the blocking member 601, and the discharge portion 314, and the upstream side discharge passage 310U is a region including the region RN but excluding the blocking member 601 and the discharge portion 314. Further, the downstream side screen 221D is one example of the downstream side annular wall, and the upstream side screen 221U is one example of the upstream side annular wall.

[0097] Thus, compared to the case where the number of the communication holes Ch provided per unit area on the entire circumference of the screen 221 is the same, it is possible to reduce the flow rate of air passing through the through-hole 222 of the downstream side screen 221D from the defibrating chamber 210 toward the discharge passage 310. Further, it is easy to cause the negative pressure generated by the suction portion 35 to act on the upstream side discharge passage 310U. Further, it is easy to increase the flow rate of the air current passing through the through-hole 222 of the upstream side screen 221U from the defibrating chamber 210 toward the discharge passage 310. As a result, it is possible to reduce the case where the defibrated material that has not been sufficiently defibrated is discharged from the through-hole 222 of the downstream side screen 221D toward the discharge passage 310. Further, it is possible to reduce the defibrated material that has been excessively defibrated.

[0098] Further, it is easy to reduce the pressure difference between the pressure of the downstream side discharge passage 310D and the pressure of the upstream side discharge passage 310U. Further, it is easy to reduce the speed difference between the flow rate of the air current passing through the through-hole 222 of the downstream side screen 221D and the flow rate of the air current passing through the through-hole 222 of the upstream side screen 221U. Thus, it is possible to reduce the defibration deviation of the defibrated material discharged toward the discharge passage 310.

[0099] Further, in the present embodiment, as illustrated in FIG. 6, the downstream side screen 221D is provided with the blocking member 601.Figure 11 As shown, the discharge passage 310 is provided in a manner so as to cover the outer side of the screen 221 across and entirely. Further, the discharge portion 314 is provided on the outer peripheral wall 351 of the housing 311, 312, 313 that forms the discharge passage 310, and is opened toward the screen 221. Thereby, it is easy to make the negative pressure generated by the suction portion 35 act on the upstream side in the discharge passage 310 farther from the discharge portion 314. Therefore, it is possible to suppress the case where the defibrated fiber is discharged to the screen 221 in a region farther from the discharge portion 314, and thus it is possible to reduce the defibration deviation of the defibrated fiber discharged to the discharge passage 310.

[0100] Further, as Figure 11 As shown by the broken line arrow mark in the middle, in the region in the discharge passage 310 that is on the +X direction side compared to the axis AR, a clockwise air current toward the discharge portion 314 can be generated, and in the region on the -X direction side compared to the axis AR, a counterclockwise air current toward the discharge portion 314 can be generated. Further, at this time, in the region in the discharge passage 310 that is farthest from the discharge portion 314, and on the -Z direction side in the vertical direction above the axis AR, a clockwise air current toward the discharge portion 314 and a counterclockwise air current toward the discharge portion 314 can be generated.

[0101] As described above, according to the defibration device 200 and the sheet manufacturing device 100 according to Embodiment 1, the following effects can be obtained.

[0102] The defibrillation device 200 includes a rotating body 500 that rotates about an axis AR of a rotating shaft 501, a defibrillation chamber 210 that houses the rotating body 500 and is rotated by the rotating body 500 to form defibrated material from a fiber-containing raw material MA, a supply pipe 20 that supplies the raw material MA to the defibrillation chamber 210, a discharge passage 310 that communicates with the defibrillation chamber 210 and discharges the defibrated material from the defibrillation chamber 210, a discharge pipe 30 to which a negative pressure is applied to discharge the defibrated material from the discharge passage 310, a discharge portion 314 that communicates the discharge passage 310 with the discharge pipe 30, a circular ring-shaped screen 221 that is disposed so as to be spaced apart from the rotating body 500 in a radial direction RR of the rotating body 500 and defines the defibrillation chamber 210, housings 311, 312, and 313 that cover the outside of the screen 221 to form the discharge passage 310 extending in a circumferential direction CR of the screen 221, a plurality of through-holes 222 provided in the screen 221 and communicating the defibrillation chamber 210 with the discharge passage 310, and an outer peripheral wall 351 provided in the housings 311, 312, and 313 so as to be spaced apart from the screen 221 in the radial direction RR. The discharge portion 314 is provided in the housing 311. When a region of the discharge passage 310 including the discharge portion 314 is set as a downstream-side discharge passage 310D and a region other than the downstream-side discharge passage 310D is set as an upstream-side discharge passage 310U, a region of the screen 221 constituting the downstream-side discharge passage 310D is set as a downstream-side screen 221D, a region constituting the upstream-side discharge passage 310U is set as an upstream-side screen 221U, and the through-holes 222 that communicate the defibrillation chamber 210 with the discharge passage 310 are set as communication holes Ch, the communication holes Ch are provided in the screen 221 in such a manner that, in a comparison of the same area of the downstream-side screen 221D and the upstream-side screen 221U, air is less likely to pass through at the downstream-side screen 221D than at the upstream-side screen 221U. Thus, compared to a case where the number of communication holes Ch provided per unit area in the entire circumference of the screen 221 is the same, the flow rate of air passing through the through-holes 222 of the downstream-side screen 221D from the defibrillation chamber 210 toward the discharge passage 310 can be reduced. In addition, it is easy for the negative pressure generated by the suction portion 35 to act on the upstream-side discharge passage 310U. Furthermore, it is easy to increase the flow rate of the air current passing through the through-holes 222 of the upstream-side screen 221U from the defibrillation chamber 210 toward the discharge passage 310. As a result, the defibrated material that has not been sufficiently defibrated can be less likely to be discharged from the through-holes 222 of the downstream-side screen 221D toward the discharge passage 310. In addition, the defibrated material that has been excessively defibrated can be reduced.

[0103] The plurality of through-holes 222 are identical in shape, and the downstream-side screen 221D has a smaller number of communication holes Ch per unit area than the upstream-side screen 221U. Thus, compared to a case where the number of communication holes Ch per unit area is the same on the entire circumference of the screen 221, the flow rate of air passing through the through-holes 222 of the downstream-side screen 221D toward the discharge passage 310 from the defibrillation chamber 210 can be reduced.

[0104] The plurality of through-holes 222 are identical in shape, and the discharge portion 314 is opposed to the screen 221, and the downstream-side screen 221D includes a region RD opposed to the discharge portion 314, and the region RN of the screen 221 has a larger number of communication holes Ch per unit area than the region RD. Thus, the flow rate of air passing through the through-holes 222 in the region RN of the screen 221 can be easily increased. Therefore, the case where defibrated fibers are over-defibrated in the defibrillation chamber 210 can be reduced, and thus the defibration deviation of defibrated fibers discharged to the discharge passage 310 can be reduced. Further, the flow of air in the defibrillation chamber 210, the through-holes 222 of the screen 221, and the discharge passage 310, which discharges defibrated fibers toward the downstream side of the discharge passage 310, can be ensured, and thus the case where defibrated fibers are retained can be suppressed.

[0105] In the screen 221, no communication holes Ch are provided in the region RD. Thus, compared to a case where the number of communication holes Ch per unit area is the same on the entire circumference of the screen 221, the flow rate of air passing through the through-holes 222 of the downstream-side screen 221D toward the discharge passage 310 from the defibrillation chamber 210 can be reduced. Thus, the negative pressure generated by the suction portion 35 can more easily act on the upstream side of the discharge passage 310 farther from the discharge portion 314. As a result, the flow of air in the defibrillation chamber 210 and the discharge passage 310, which discharges defibrated fibers toward the downstream side of the discharge passage 310, can be ensured, and thus the case where defibrated fibers are retained can be suppressed. Further, compared to a case where communication holes Ch are provided in the region RD, the defibration deviation caused by an increase in the number of un-defibrated fibers can be reduced.

[0106] The defibration device 200 further includes a blocking member 601 in the region RD, which blocks the openings of the through-holes 222 by covering the screen 221. Thus, the communication between the defibrillation chamber 210 and the discharge passage 310 realized by the through-holes 222 can be blocked. Therefore, the number of communication holes Ch provided on the screen 221 can be changed, and a region where the communication holes Ch are fewer can be formed on the screen 221.

[0107] The closing member 601 is provided on the outer peripheral surface of the face of the screen 221 on the side of the discharge passage 310, and closes the opening of the screen 221 on the outer peripheral surface side. Thus, it is possible to form a region with fewer communication holes Ch on the screen 221 without changing the gap between the screen 221 and the rotating body 500.

[0108] The housing 311, 312, 313 forms the discharge passage 310 by surrounding the outside of the screen 221 in the circumferential direction CR. Thus, since the discharge passage 310 is provided across the entire circumference of the outside of the screen 221, it is possible to provide the through-hole 222 across the entire circumference of the screen 221. Therefore, it is easy to discharge the defibrated material in the defibration chamber 210 to the discharge passage 310.

[0109] Regarding the gap between the outer peripheral wall 351 and the screen 221, the gap is narrower on the side of the region of the discharge passage 310 away from the downstream-side discharge passage 310D in the circumferential direction CR than on the side of the downstream-side discharge passage 310D. Thus, it is easy to increase the average flow rate of the air current in the region of the discharge passage 310 away from the discharge portion 314. Further, it is possible to bring the central region of the flow passage cross section of the discharge passage 310, in which the flow rate of the air current is the highest, close to the screen 221. Therefore, it is possible to suppress the defibrated material from remaining in the discharge passage 310.

[0110] The rotating body 500 is housed in the defibration chamber 210 so that the axis of rotation AR intersects the vertical direction, and the discharge portion 314 is provided at the lowermost position in the outer peripheral wall 351. Thus, it is possible to cause the gravitational force acting on the defibrated material to act on the defibrated material discharged to the discharge passage 310 as a force toward the discharge portion 314. Therefore, it is possible to efficiently discharge the defibrated material in the discharge passage 310 from the discharge passage 310 toward the discharge pipe 30.

[0111] The sheet manufacturing device 100 includes the defibration device 200, a second web forming portion 70 that forms a second web Wb2 by piling the defibrated material discharged from the discharge pipe 30, and a sheet forming portion 80 that forms a fiber-containing sheet S by bonding the fibers included in the second web Wb2 together. Thus, the sheet manufacturing device 100 can form the sheet S from the defibrated material formed in the defibration device 200.

[0112] Although the defibration device 200 and the sheet manufacturing device 100 according to the above-described embodiment of the present application are devices based on the structure described above, of course, partial structural changes or omissions, etc. can be made without departing from the gist of the present application. Further, the above-described embodiment and other embodiments described below can be implemented in combination with each other within a range in which technical contradictions do not occur. Hereinafter, other embodiments will be described.

[0113] In the above-described embodiment, the plurality of through-holes 222 can also be the same shape, and the through-holes 222 can be provided on the screen 221 in a manner such that the number of communication holes Ch provided per unit area in the screen 221 gradually increases as it moves away from the discharge portion 314 in the circumferential direction CR. In this case, for example, the through-hole rows in which the same number of through-holes 222 are arranged in the Y-axis direction can be provided on the screen 221 in a manner such that the spacing between the through-hole rows narrows as it moves away from the discharge portion 314 in the circumferential direction CR. Further, for example, the through-hole rows in which the through-holes 222 are arranged in the Y-axis direction can be provided on the screen 221 in a manner such that the same spacing is left in the circumferential direction CR, and the number of through-holes forming the through-hole rows increases as it moves away from the discharge portion 314 in the circumferential direction CR. Thereby, it is easy to cause the negative pressure generated by the suction portion 35 to act on the upstream side of the discharge passage 310 farther from the discharge portion 314. Further, it is easy to reduce the speed difference in the flow rate of the airflow passing through the plurality of through-holes 222 provided on the screen 221. Therefore, it is possible to reduce the defibration deviation of the defibrated material discharged to the discharge passage 310.

[0114] In the above-described embodiment, the discharge portion 314 can also not be provided on the outer peripheral wall 351. For example, the discharge portion 314 can be provided on either of the side wall 353 and the side wall 352 of the housing 311. Further, for example, in the case where the discharge portion 314 is provided on the side wall 353, the discharge portion 314 can be opposed to the screen 221, or can be opposed to the side wall 352 without being opposed to the screen 221. In this case, the closure member 601 is provided in the region of the downstream-side screen 221D that is not opposed to the discharge portion 314. That is, the closure member 601 closes the openings of the through-holes 222 by covering the downstream-side screen 221D. Further, the closure member 601 is provided on the outer peripheral surface of the surface on the discharge passage 310 side of the downstream-side screen 221D, and closes the openings of the through-holes 222 on the outer peripheral surface side. Thereby, it is possible to block the communication between the defibration chamber 210 and the discharge passage 310 realized by the through-holes 222. Therefore, it is possible to change the number of communication holes Ch provided on the downstream-side screen 221D, and form a region in which the communication holes Ch are fewer on the downstream-side screen 221D. In this case, the plurality of through-holes 222 provided on the screen 221 can also not be the same shape.

[0115] In the above-described embodiment, the defibrating device 200 can also be disposed on the sheet manufacturing device 100 in a posture in which the axis AR is not horizontal. In this case, the defibrating device 200 can also be disposed on the sheet manufacturing device 100 in a posture in which the axis AR is crossed with the horizontal direction and inclined, with the lowermost position of the discharge portion 314 on the outer peripheral wall 351 as a condition.

[0116] In the above-described embodiment, the defibrating device 200 can also be disposed on the sheet manufacturing device 100 in a posture in which the discharge portion 314 and the discharge pipe 30 are vertically below the axis AR. For example, the defibrating device 200 can also be disposed on the sheet manufacturing device 100 in a posture in which the discharge portion 314 and the discharge pipe 30 are vertically above the axis AR. Further, for example, the defibrating device 200 can also be disposed on the sheet manufacturing device 100 in a posture in which the discharge portion 314 and the discharge pipe 30 are aligned with the axis AR in the horizontal direction.

[0117] In the above-described embodiment, the interval W between the outer peripheral wall 351 and the screen 221 can also be made to be gradually narrower as it moves away from the discharge portion 314 in the circumferential direction CR. For example, it can be configured such that, when the interval W of the region of the discharge passage 310 on the -Z direction side of the axis AR is set to an interval W1, and the interval W of the region on the +Z direction side of the axis AR is set to an interval W3 that is wider than the interval W1, the interval W of the region of the discharge passage 310 that connects between the region on the -Z direction side of the axis AR and the region on the +Z direction side of the axis AR is made to be gradually narrower from the region on the +Z direction side of the axis AR toward the region on the -Z direction side of the axis AR. Alternatively, the interval W of the region of the discharge passage 310 that connects between the region on the -Z direction side of the axis AR and the region on the +Z direction side of the axis AR can also be made to be an interval that is narrower than the interval W3 and wider than the interval W1.

[0118] In the above-described embodiment, the discharge passage 310 can also be made not to be bilaterally symmetrical, with the condition that, as shown in FIG. 9, the interval W of the region of the discharge passage 310 that connects between the region on the -Z direction side of the axis AR and the region on the +Z direction side of the axis AR is made to be gradually narrower from the region on the +Z direction side of the axis AR toward the region on the -Z direction side of the axis AR. Figure 14When the discharge channel 310 is observed from the -Y direction side as shown, a clockwise airflow toward the discharge section 314 is generated in the region of the discharge channel 310 that becomes the discharge section 314 in the +X direction, and a counterclockwise airflow toward the discharge section 314 is generated in the region that becomes the discharge section 314 in the -X direction. In this case, for example, the intervals W2 and W4 can be different, or the region where the interval W is narrowest can be shifted from the position in the -Z direction, which becomes the axis AR, toward the X-axis direction. Furthermore, for example, the interval D between the sidewalls 352 and 353 can be different in the region that becomes the discharge section 314 in the +X direction and the region that becomes the discharge section 314 in the -X direction.

[0119] In the above embodiment, a fixing blade may also be provided in the area opposite the rotating blade 503 on the inner circumferential surface of the screen 221. The fixing blade defibers the raw material MA introduced between it and the rotating blade 503. In this case, the fixing blade may also be fixed to the inner circumferential surface of the screen 221 with a gap between it and the tip of the rotating blade 503. Figure 14 As shown, when viewed from the -Y direction side, the fixing blade may also have a sharp shape protruding from the screen 221 toward the rotating blade 503, and this fixing blade is a shape extending in the Y-axis direction. When multiple fixing blades are provided, they may be arranged such that they span the entire circumference of the screen 221 while being spaced apart in the circumferential direction CR. Alternatively, the fixing blades may be provided in the area of ​​the inner circumferential surface of the screen 221 that is opposite to the outer circumferential surface where the closing member 601 is provided.

[0120] In the above embodiment, the supply section 214 can be a through hole that penetrates the sidewall 212 in the Y-axis direction, and it does not have to be circular. For example, the supply section 214 can also be polygonal or elliptical, or it can be an arc shape centered on the axis AR.

[0121] In the above embodiment, the supply section 214 may not be opened at a position vertically above the axis AR in the side wall 212. For example, the supply section 214 may be opened at a position in the side wall 212 that is horizontally aligned with the axis AR.

[0122] In the above embodiment, the discharge portion 314 may also be circular when viewed from the Z-axis direction. Furthermore, the dimension of the opening edge portion 315 in the Y-axis direction may be different from the internal dimension of the discharge channel 310 in the Y-axis direction. In this case, for example, the dimension of the opening edge portion 315 in the Y-axis direction may be smaller compared to the internal dimension of the discharge channel 310 in the Y-axis direction.

[0123] In the above embodiment, the dimension of the closing member 601 in the Y-axis direction may also be different from the dimension of the discharge channel 310 in the Y-axis direction. For example, the dimension of the closing member 601 in the Y-axis direction may be smaller than the dimension of the discharge channel 310 in the Y-axis direction. Furthermore, the dimension of the closing member 601 in the X-axis direction may be the same as or smaller than the dimension of the opening edge portion 315 in the discharge portion 314. Additionally, the closing member 601 may not be rectangular. For example, the closing member 601 may be circular or elliptical.

[0124] In the above embodiment, the defiberizing device 200 may also omit the sealing member 601. In this case, the through holes 222 in the region RD may be provided in such a way that the number of through holes 222 provided per unit area in the screen 221 is reduced compared to the region ERD. Alternatively, the number of connecting holes Ch in the region RD may be reduced compared to the region ERD by providing the aforementioned fixing blade on the inner circumferential surface of the screen 221 corresponding to the region RD. In this case, the fixing blade may be described as an example of a sealing member provided on the inner circumferential surface of the screen 221 that forms the defiberizing chamber 210 side and which closes the opening on the inner circumferential surface side of the through holes 222.

[0125] In the above embodiments, the housings 311, 312, and 313 may not cover the outer side of the screen 221 by spanning the entire circumference of the circumferential CR. Furthermore, the discharge channel 310 may not be provided by spanning the entire circumferential CR of the outer side of the screen 221. For example, in the above embodiments, the area partially covered by the housing 311, between the outer side of the screen 221 and the outer peripheral wall 351 of the housing 311, may be designated as the discharge channel 310. In this case, the through holes 222 may not be provided in the areas of the screen 221 not covered by the housing 311.

[0126] In the above embodiment, the spacing W between the outer peripheral wall 351 and the screen 221 in the circumferential CR direction of the screen 221 can also be the same. In this case, the cross-sectional area of ​​the discharge channel 310 can also remain unchanged in the circumferential CR direction of the screen 221, and be the same.

[0127] In the above embodiments, the multiple through holes 222 may not have the same shape. For example, when a pressure difference ΔP is applied to the openings on both sides of a through hole 222, and the flow rate of air passing through the through hole 222 per unit time is the flow rate Qh, if the value represented by ΔP / Qh is set as the flow resistance Rh, then the multiple through holes 222 may not have the same shape if the flow resistance Rh is the same.

[0128] While in the above embodiment, by reducing the number of identically shaped connecting holes Ch provided per unit area on the downstream screen 221D compared to the upstream screen 221U, thus making it less difficult for air to pass through the downstream screen 221D than the upstream screen 221U when comparing downstream screens 221D and upstream screens 221U of the same area, it is also possible to make it less difficult for air to pass through the downstream screen 221D than the upstream screen 221U by making the shape of the connecting holes Ch different between the downstream screens 221D and upstream screens 221U. For example, by reducing the aperture of the connecting holes Ch provided on the downstream screen 221D compared to the upstream screen 221U, thus making it less difficult for air to pass through the downstream screen 221D than the upstream screen 221U when comparing downstream screens 221D and upstream screens 221U of the same area. In this case, compared with the upstream screen 221U, the number of connecting holes Ch per unit area on the downstream screen 221D can be the same or less.

[0129] Symbol Explanation

[0130] 2, 3, 7, 8, 54…pipe; 9…hopper; 10…feeding and receiving section; 12…coarse crushing section; 14…coarse crushing blade; 20…feeding pipe; 30…discharge pipe; 35…suction section; 40…screening section; 41…roller section; 42…inlet; 43…collection section; 44…discharge outlet; 45…first sheet forming section; 46…mesh belt; 47, 47a…supporting roller; 48…suction section; 49…rotating body; 49a…base; 49b…protrusion; 50…mixing… 52…Additive supply section; 52a…Additive box; 56…Mixing blower; 60…Stacking section; 61…Roller section; 63…Collection section; 70…Second sheet forming section; 72…Wire mesh belt; 74…Setting roller; 76…Suction mechanism; 78…Humidification section; 79…Conveying section; 79a…Wire mesh belt; 79b…Roller; 79c…Suction mechanism; 80…Sheet forming section; 82…Pressure section; 84…Heating section; 85…Calendar roller; 86…Heating roller; 90…Cutting section; 92…First cutting section; 94…Second cutting section; 96…Discharge section; 100…Sheet manufacturing apparatus; 200…Fiber debonding device; 210…Fiber debonding chamber; 211…Fixing component; 212, 213…Side walls; 214…Supply section; 221…Screw; 221D…Downstream side screen; 221U…Upstream side screen; 222…Through hole; 310…Discharge channel; 310D…Downstream side discharge channel; 310U…Upstream side discharge Channel; 311, 312, 313…shell; 314…discharge section; 315…opening edge; 351…outer peripheral wall; 352, 353…side wall; 401, 402…support section; 500…rotating body; 501…rotating shaft; 502…base; 503…rotating blade; 504…rotating vane; 601…closing component; F1…conveying direction; W1, W2, W3, W4…interval; Wb1…first material piece; Wb2…second material piece.

Claims

1. A fiber unwinding device, comprising: A rotating body that rotates about the axis of rotation as its center of rotation; The defiber chamber houses the rotating body and rotates it to form a defibered material from the fibrous raw material. A supply pipe that supplies the raw material to the defiberization chamber; A discharge channel, which communicates with the defiber chamber, and allows the defiber material to be discharged from the defiber chamber; A discharge pipe is subjected to negative pressure, thereby discharging the defibered material from the discharge channel; A discharge section, which connects the discharge channel and the discharge pipe; An annular wall, which is arranged to leave a gap with the rotating body in the radial direction, defines the defiberization chamber; The housing forms the discharge channel extending circumferentially from the annular wall by covering the outer side of the annular wall; Multiple through holes are provided on the annular wall; The outer peripheral wall, which is the outer peripheral wall of the housing, is provided in a manner that leaves a gap from the annular wall in the radial direction. The discharge section is provided on the housing. The region containing the discharge section in the discharge channel is designated as the downstream discharge channel, and the region other than the downstream discharge channel is designated as the upstream discharge channel. The region of the annular wall constituting the downstream discharge channel is designated as the downstream annular wall, and the region constituting the upstream discharge channel is designated as the upstream annular wall. The through hole among the plurality of through holes that connects the fiber-debonding chamber and the discharge channel is designated as a connecting hole. The connecting hole is provided on the annular wall in such a way that, when comparing the downstream annular wall and the upstream annular wall of the same area, air is made less likely to pass through the downstream annular wall than through the upstream annular wall.

2. The fiber-debonding device as described in claim 1, wherein, The annular wall further includes a closing component on its downstream side. The sealing component closes the opening of the through hole by covering the annular wall.

3. The fiber-debonding device as described in claim 1 or claim 2, wherein, The multiple through holes are of the same shape. Compared to the upstream annular wall, the downstream annular wall has fewer connecting holes per unit area.

4. The fiber-debonding device as described in claim 1, wherein, The multiple through holes are of the same shape. The discharge section is opposite to the annular wall. The downstream annular wall includes the opposing region opposite the discharge section. The region in the annular wall that is furthest from the discharge part in the circumferential direction has a greater number of connecting holes per unit area compared to the opposing region.

5. The fiber-debonding device as described in claim 4, wherein, The connecting hole is not provided in the opposite region on the annular wall.

6. The fiber-debonding device as described in claim 4 or claim 5, wherein, A sealing component is also provided on the annular wall in the opposing region. The sealing component closes the opening of the through hole by covering the annular wall.

7. The fiber-debonding device as described in claim 2, wherein, The sealing component is disposed on the outer peripheral surface of the face of the annular wall that forms the discharge channel side, and seals the opening on the outer peripheral surface side of the through hole.

8. The fiber-debonding device as claimed in claim 1, wherein, The multiple through holes are of the same shape. On the annular wall, the number of the connecting holes per unit area gradually increases as they move away from the discharge portion in the circumferential direction.

9. The fiber-debonding device as claimed in claim 1, wherein, The housing forms the discharge channel by surrounding the outer side of the annular wall in the circumferential direction.

10. The fiber-debonding apparatus as claimed in claim 1, wherein, Regarding the interval between the outer peripheral wall and the annular wall, the region in the discharge channel that is circumferentially farther from the downstream discharge channel is narrower compared to the downstream discharge channel.

11. The fiber-debonding apparatus as claimed in claim 1, wherein, The rotating body is housed in the de-firing chamber such that its axis intersects the vertical direction. The discharge section is located at the lowest position in the outer peripheral wall.

12. A fiber manufacturing apparatus, comprising: The fiber-de-fiber device according to any one of claims 1 to 11; A sheet forming section forms a sheet by accumulating the defiber discharged from the discharge pipe; A fiber body forming section forms a fiber body containing the fibers by bonding the fibers contained in the sheet together.

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