JP2019116939A - Shell, defibrated material transport device and used paper regenerator - Google Patents

Abstract

To provide a shell capable of preventing the shell from adhesion of a defibrated material; a defibrated material transport device; and a used paper regenerator.SOLUTION: A shell for conveying defibrated material containing disintegrated fibers by air flow, the shell has a bend formed in the middle of the extending direction, and a plurality of grooves extending in the extending direction of the shell are formed on the inner surface of the shell on the outer peripheral side of the bend. The plurality of grooves preferably include a groove parallel to the central axis of the shell and a groove inclined within ± 30° with respect to the central axis of the shell.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a tubular body, a defibrated material conveying device, and a used paper recycling device.

  When transporting a liquid such as oil or water, it is known to transport the liquid using a tube through which the liquid passes (see, for example, Patent Document 1). The tubular body described in Patent Document 1 has riblets (grooves) formed on the inner surface (inner wall of the tube) to reduce energy loss and friction in the tube.

Japanese Patent Publication No. 2015-530527

  However, when the tubular body described in Patent Document 1 is used for transporting the defibrated material from which paper has been disintegrated, instead of transporting the liquid, in the curved portion of the tubular body, for example, the fibrillated material is It is fully conceivable that it may be difficult to carry out smooth transport, as it adheres to the inner surface, or the attached matter becomes so-called "slough" to inhibit passage of the defibrated material.

  An object of the present invention is to provide a tubular body, a defibrated material transport device and a used paper recycling device in which adhesion of defibrated material is prevented.

  The present invention has been made to solve at least a part of the above-mentioned problems, and can be realized as the following.

The tubular body of the present invention is a tubular body for transporting defibrated material containing defibrated fibers by air flow,
The tube body has a curved portion formed by bending in the middle of the extending direction,
The inner surface of the tube on the outer peripheral side of the curved portion is characterized in that a plurality of grooves extending in the extending direction of the tube are formed.

  As a result, it is possible to prevent or suppress a decrease in flow velocity on the outer peripheral side of the curved portion, and it is possible to alleviate the generation of secondary flow (vortex) in the curved portion. Such a straightening effect causes the defibrated material to flow down downstream before adhering to the inner surface on the outer peripheral side of the curved portion, thereby preventing the adhesion to the inner surface.

  In the tube of the present invention, the plurality of grooves preferably include grooves parallel to the central axis of the tube.

  As a result, it is possible to prevent or suppress a decrease in flow velocity on the outer peripheral side of the curved portion, and it is possible to alleviate the generation of secondary flow (vortex) in the curved portion. Such a straightening effect causes the defibrated material to flow down downstream before adhering to the inner surface on the outer peripheral side of the curved portion, thereby preventing the adhesion to the inner surface.

  In the pipe body of the present invention, the plurality of grooves formed to extend on the inner surface of the pipe body include grooves inclined within ± 30 ° with respect to the central axis of the pipe body. Is preferred.

  As a result, it is possible to prevent or suppress the decrease in flow velocity on the outer peripheral side of the curved portion, and it is possible to alleviate the generation of secondary flow (vortex) in the curved portion. Such a straightening effect causes the defibrated material to flow down downstream before adhering to the inner surface on the outer peripheral side of the curved portion, thereby preventing the adhesion to the inner surface.

  In the pipe body of the present invention, the plurality of grooves preferably include grooves intersecting each other.

  As a result, the swirling flow along one groove and the swirling flow along the other groove cancel each other, and hence it is possible to eliminate the tendency for the defibrated material to adhere to the inner surface. .

In the tubular body of the present invention, the formation region of the groove in the inner surface of the tubular body is preferably 10% or more and 100% or less in the circumferential direction in a cross section orthogonal to the extending direction.
Thereby, the adhesion preventing effect of the defibrated material on the inner surface on the outer peripheral side of the curved portion is further improved.

In the tube according to the present invention, the formation region of the groove on the inner surface of the tube is preferably 50% or more and 100% or less of the total length of the portion along the extending direction which is the maximum length of the curved portion. .
Thereby, the adhesion preventing effect of the defibrated material on the inner surface on the outer peripheral side of the curved portion is further improved.

In the tube body of the present invention, between the grooves adjacent to each other, a ridge extending in the extending direction of the tube body is formed,
It is preferable that the occupancy rate of the groove in the formation region of the groove is 6 times or more and 20 times or less that of the ridge.

  Thereby, the contact area of the inner surface to the defibrated material can be reduced as much as possible. That is, in the inner surface, the defibrated material is in point contact as much as possible. As a result, even if the defibrated material once adheres to the inner surface, the defibrated material peels off rapidly from the inner surface before it becomes lumps, thus preventing the adhesion to the inner surface.

  In the pipe body of the present invention, the groove is preferably formed also on the inner surface upstream of the curved portion.

  Thereby, it is possible to prevent or suppress the decrease in the flow velocity even immediately before the defibrated material reaches the curved portion, and therefore, the flow velocity in the curved portion can be maintained as it is. Thus, the defibrated material can quickly cross the curved portion, thereby contributing to the prevention of adhesion of the defibrated material.

In the tube of the present invention, the radius of curvature of the curved portion is preferably at least one time and at most 50 times the inner diameter of the tube.
Thereby, the adhesion preventing effect of the defibrated material on the inner surface on the outer peripheral side of the curved portion is further improved.

  In the tube of the present invention, the central angle centered on the curvature center of the curved portion is preferably more than 0 ° and not more than 180 °.

  Thus, for example, when the pipe body is likely to interfere with other peripheral equipment, the equipment can be avoided to prevent interference with the equipment.

The defibrated material conveying apparatus of the present invention comprises the tube of the present invention,
And an air flow source connected to the tube to generate an air flow in the tube.

  As a result, it is possible to prevent or suppress the decrease in the flow velocity on the outer peripheral side in the curved portion, and it is possible to alleviate the generation of secondary flow (vortex) in the curved portion. Such a straightening effect causes the defibrated material to flow down downstream before adhering to the inner surface on the outer peripheral side in the curved portion, thereby preventing the adhesion to the inner surface. In addition, the defibrated material can be transported smoothly.

The waste paper recycling apparatus of the present invention comprises a defibrating unit that defibs used waste paper;
And a defibrillator according to the present invention, which transports the defibrated material obtained by the fibrillation unit.

  As a result, it is possible to prevent or suppress the decrease in the flow velocity on the outer peripheral side in the curved portion, and it is possible to alleviate the generation of secondary flow (vortex) in the curved portion. Such a straightening effect causes the defibrated material to flow down downstream before adhering to the inner surface on the outer peripheral side in the curved portion, thereby preventing the adhesion to the inner surface. In addition, the paper can be stably regenerated from the defibrated material.

FIG. 1 is a schematic side view showing a used paper recycling apparatus (first embodiment) of the present invention. FIG. 2 is a perspective view showing a defibrated material conveying device provided in the used paper recycling apparatus shown in FIG. 1 and the periphery thereof. FIG. 3 is a diagram showing the flow velocity distribution in the region [A] surrounded by the one-dot chain line in FIG. FIG. 4 is a longitudinal cross-sectional view of a region [A] surrounded by an alternate long and short dash line in FIG. FIG. 5 is a cross-sectional view taken along the line B-B in FIG. 6 is a view seen from the direction of arrow C in FIG. 7 is a cross-sectional view taken along the line D-D in FIG. FIG. 8 is an enlarged view of a region [E] surrounded by an alternate long and short dash line in FIG. FIG. 9 is a cross-sectional view showing a groove formed in the tube of the disintegrate transport device provided in the used paper recycling apparatus (second embodiment) of the present invention. FIG. 10 is a view showing a formed state of a groove formed in a tube of a disintegrate transport device provided in the used paper recycling apparatus (third embodiment) of the present invention.

  BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the tubular body, the defibrated material conveyance device and the used paper recycling apparatus of the present invention will be described in detail based on the preferred embodiments shown in the attached drawings.

First Embodiment
FIG. 1 is a schematic side view showing a used paper recycling apparatus (first embodiment) of the present invention. FIG. 2 is a perspective view showing a defibrated material conveying device provided in the used paper recycling apparatus shown in FIG. 1 and the periphery thereof. FIG. 3 is a diagram showing the flow velocity distribution in the region [A] surrounded by the one-dot chain line in FIG. FIG. 4 is a longitudinal cross-sectional view of a region [A] surrounded by an alternate long and short dash line in FIG. FIG. 5 is a cross-sectional view taken along the line B-B in FIG. 6 is a view seen from the direction of arrow C in FIG. 7 is a cross-sectional view taken along the line D-D in FIG. FIG. 8 is an enlarged view of a region [E] surrounded by an alternate long and short dash line in FIG. In the following, for convenience of explanation, the upper side in FIGS. 1 and 2 may be referred to as “upper” or “upper” and the lower side as “lower” or “lower”. In addition, the left side in FIG. 1 may be referred to as “left” or “upstream side”, and the right side may be referred to as “right” or “downstream side”.

  As shown to FIG. 1, FIG. 2, the pipe | tube 242 (tube body) of this invention is a pipe body which conveys the defibrated material M3 containing the disintegrated fiber by air flow. The pipe 242 (tube body) has a curved portion formed by bending in the middle of the longitudinal direction (extension direction) of the pipe 242 (tube body), and the pipe 242 (tube body) on the outer peripheral side of the curved portion A plurality of grooves 3 (see FIGS. 4 to 7) extending in the longitudinal direction (extending direction) of the tube 242 (tube) are formed on the inner surface of the tube. In the present embodiment, the tube 242 is formed with a bending portion 242a, a bending portion 242b, a bending portion 242c, a bending portion 242d, a bending portion 242e, a bending portion 242f, a bending portion 242g, and a bending portion 242h. Hereinafter, the groove 3 formed on the inner surface 252 on the outer peripheral (curved outer peripheral) 251 side of the curved portion 242 f will be described representatively.

  According to the present invention, as described later, it is possible to prevent or suppress the decrease in the flow velocity on the inner surface 252 (periphery 251) side in the curved portion 242f, and also the secondary flow in the curved portion 242f. Generation of (vortex) can be mitigated. Such a rectifying effect causes the defibrated material M3 to flow downstream before adhering to the inner surface 252, thereby preventing the adhesion to the inner surface 252.

  Further, the defibrated material conveyance device 1 of the present invention shown in FIG. 2 is connected to the pipe 242 (tubular body) and the pipe 242 (tubular body), and generates an air flow in the pipe 242 (tubular body). And the blower 261.

  According to the present invention as described above, the fibrillated material M3 can be transported smoothly and efficiently while enjoying the advantages of the pipe 242 described above.

  The used paper recycling apparatus (sheet manufacturing apparatus) 100 according to the present invention shown in FIG. 1 comprises: a defibrating unit 13 for fracturing used waste paper; and a defibrated product for transporting the defibrated material M3 obtained by the defibrating unit 13 And a transport device 1.

  According to the present invention, the sheet S (paper) can be stably regenerated (manufactured) from the fibrillated material M3 while enjoying the advantages of the fibrillated material conveying device 1 described above.

  As shown in FIG. 1, the used paper recycling apparatus 100 mixes the raw material supply unit 11, the crushing unit 12, the defibrating unit 13, the sorting unit 14, the first web forming unit 15, and the subdivision unit 16. A part 17, a loosening part 18, a second web forming part 19, a sheet forming part 20, a cutting part 210, a stock part 220 and a collecting part 27 are provided. In addition, the used paper recycling apparatus 100 includes a humidifying unit 231, a humidifying unit 232, a humidifying unit 233, a humidifying unit 234, a humidifying unit 235, and a humidifying unit 236. In addition, the used paper recycling apparatus 100 includes a blower 261, a blower 262, and a blower 263.

  The operation of each part of the used paper recycling apparatus 100 is controlled by a control unit (not shown). The control unit may be built in the used paper recycling apparatus 100 or may be provided in an external device such as an external computer. For example, when the external device is communicated with the used paper recycling apparatus 100 via a cable or the like, or when wireless communication is performed, the external apparatus may be connected to the used paper recycling apparatus 100 via a network (for example, the Internet).

  In the waste paper recycling apparatus 100, the raw material supply process, the coarse crushing process, the fibrillation process, the sorting process, the first web forming process, the dividing process, the mixing process, the loosening process, and the second web formation A process, a sheet formation process, and a cutting process are performed in this order.

The configuration of each part will be described below.
The raw material supply part 11 is a part which performs the raw material supply process which supplies the raw material M1 (base material) to the crushing part 12. As shown in FIG. The raw material M1 is a sheet-like material containing fibers (cellulose fibers). In addition, what is necessary is just what makes cellulose (cellulose in a narrow sense) as a main component and makes a fibrous form with a compound as a cellulose fiber, and also contains hemicellulose and lignin besides cellulose (cellulose in a narrow sense) Good. Moreover, the raw material M1 does not ask | require a form, such as a woven fabric and a nonwoven fabric. Also, the raw material M1 may be, for example, recycled paper (regenerated) manufactured by disaggregating waste paper, Yupo paper (registered trademark) of synthetic paper, or may not be recycled paper. Moreover, in the present embodiment, the raw material M1 is used waste paper.

  The crushing unit 12 is a part that performs a crushing process of crushing the raw material M1 supplied from the raw material supply unit 11 in the air (in the air) or the like. The crushing unit 12 has a pair of crushing blades 121 and a chute (hopper) 122.

  The pair of coarse crushing blades 121 can rotate the raw material M1 between them in a direction opposite to each other to coarsen, that is, cut the raw material M1 into coarse pieces M2. The shape and size of the coarse fragments M2 are preferably suitable for the defibrating treatment in the defibrating unit 13. For example, the length of one side is preferably a small piece of 100 mm or less, and a small piece of 10 mm to 70 mm Is more preferred.

  The chute 122 is disposed below the pair of crushing blades 121 and has, for example, a funnel shape. Thus, the chute 122 can receive the coarse fragments M2 that have been crushed and dropped by the crushing blade 121.

  Further, above the chute 122, the humidifying unit 231 is disposed adjacent to the pair of coarse crushing blades 121. The humidifying unit 231 humidifies the coarse fragments M2 in the chute 122. The humidifying unit 231 has a filter (not shown) containing water, and by passing air through the filter, a vaporization type (or hot air vaporization type) that supplies humidified air with increased humidity to the coarse debris M2 It consists of a humidifier. By supplying the humidified air to the coarse fragments M2, the coarse fragments M2 can be prevented from adhering to the chute 122 etc. by static electricity.

  The chute 122 is connected to the defibrating unit 13 via a pipe (flow path) 241. The coarse fragments M2 collected in the chute 122 pass through the pipe 241 and are transported to the defibrating unit 13.

  The defibration unit 13 is a portion that performs a defibration step of disaggregating the coarse fragments M2 in the air, that is, in a dry manner. By the defibrating process in the defibrating unit 13, the defibrated product M3 can be generated from the coarse fragments M2. Here, "disintegrate" refers to loosening the coarse fragments M2 formed by binding a plurality of fibers into one fiber. And this disentangled thing becomes disentangled material M3. The shape of the defibrated material M3 is linear or band-like. In addition, the defibrated materials M3 may be present in a state of being entangled and in a lump, that is, in a state of forming a so-called "dama".

  For example, in the present embodiment, the defibrating unit 13 is an impeller mill having a rotor rotating at high speed and a liner located on the outer periphery of the rotor. The coarse fragments M2 flowing into the defibrating unit 13 are defibrated by being sandwiched between the rotor and the liner.

  Further, the defibrating unit 13 can generate a flow (air flow) of air from the coarse crushing unit 12 to the sorting unit 14 by the rotation of the rotor. Thereby, the coarse fragments M2 can be sucked from the pipe 241 to the defibrating unit 13. In addition, after the defibration treatment, the defibrated material M3 can be sent out to the sorting unit 14 through the pipe 242.

  In the middle of the pipe 242, a blower 261 is installed. The blower 261 is an air flow generating device that generates an air flow toward the sorting unit 14. Thus, the delivery of the defibrated material M3 to the sorting unit 14 is promoted.

  The sorting unit 14 is a part that performs a sorting step of sorting the defibrated material M3 according to the length of the fiber. In the sorting unit 14, the defibrated material M3 is sorted into the first sorted material M4-1 and the second sorted material M4-2 larger than the first sorted material M4-1. The first sorted product M4-1 has a size suitable for the subsequent production of the sheet S. The average length is preferably 1 μm to 30 μm. On the other hand, the second sorted product M4-2 includes, for example, those having insufficient defibration and those in which the defibrated fibers are excessively aggregated.

  The sorting unit 14 has a drum unit 141 and a housing unit 142 for housing the drum unit 141.

The drum unit 141 is a screen formed in a cylindrical shape and is a sieve that rotates around its central axis. The defibrated material M3 flows into the drum portion 141. And, by rotation of the drum portion 141, the defibrated material M3 smaller than the mesh size of the mesh is selected as the first sorted material M4-1, and the defibrillated material M3 having a size larger than the mesh size is The second sorted product M4-2 is sorted.
The first sorted matter M4-1 falls from the drum unit 141.

  On the other hand, the second sorted matter M4-2 is sent out to a pipe (flow path) 243 connected to the drum portion 141. The pipe 243 is connected to the pipe 241 at the opposite side (downstream side) to the drum portion 141. The second sorted product M4-2 which has passed through the pipe 243 joins the coarse fragments M2 in the pipe 241 and flows into the defibrating unit 13 together with the coarse fragments M2. As a result, the second sorted product M4-2 is returned to the defibrating unit 13 and disintegrated with the coarse fragments M2.

  In addition, the first sorted matter M4-1 from the drum unit 141 drops while dispersing in air and travels to the first web forming unit (separation unit) 15 located below the drum unit 141. The 1st web formation part 15 is a portion which performs the 1st web formation process which forms the 1st web M5 from the 1st sorting thing M4-1. The first web forming unit 15 has a mesh belt (separation belt) 151, three stretching rollers 152, and a suction unit (suction mechanism) 153.

  The mesh belt 151 is an endless belt, on which the first sorted matter M4-1 is deposited. The mesh belt 151 is wound around three tension rollers 152. Then, by the rotational driving of the tension roller 152, the first sorted material M4-1 on the mesh belt 151 is conveyed to the downstream side.

  The first sorted matter M4-1 has a size equal to or larger than the opening of the mesh belt 151. Thereby, the passage of the mesh belt 151 is restricted, and therefore, the first sorted matter M4-1 can be deposited on the mesh belt 151. In addition, since the first sorted matter M4-1 is transported to the downstream side together with the mesh belt 151 while being deposited on the mesh belt 151, it is formed as a layered first web M5.

  Moreover, there is a possibility that dust, dirt, etc. may be mixed in the first sorted matter M4-1, for example. Dust and dirt may be generated, for example, by crushing or disintegration. And such dust and dirt will be collected by collection part 27 mentioned below.

  The suction unit 153 can suction air from below the mesh belt 151. Thus, dust and dirt that has passed through the mesh belt 151 can be suctioned together with air.

  In addition, the suction unit 153 is connected to the collection unit 27 via a pipe (flow passage) 244. The dust and dirt sucked by the suction unit 153 are collected by the collection unit 27.

  A pipe (flow path) 245 is further connected to the recovery unit 27. Further, a blower 262 is installed in the middle of the pipe 245. By the operation of the blower 262, a suction force can be generated in the suction unit 153. This promotes the formation of the first web M5 on the mesh belt 151. The first web M5 is one from which dust, dirt and the like have been removed. Further, dust and dirt pass through the pipe 244 by the operation of the blower 262 and reach the collection unit 27.

  The housing portion 142 is connected to the humidifying portion 232. The humidifying unit 232 is configured of a vaporization type humidifier similar to the humidifying unit 231. Thus, the humidified air is supplied into the housing portion 142. The humidified air can humidify the first sorted matter M4-1, and thus can prevent the first sorted matter M4-1 from adhering to the inner wall of the housing portion 142 by electrostatic force.

  A humidifying unit 235 is disposed downstream of the sorting unit 14. The humidifying unit 235 is configured of an ultrasonic humidifier that sprays water. Thus, water can be supplied to the first web M5, and the water content of the first web M5 can be adjusted. By this adjustment, the adsorption of the first web M5 to the mesh belt 151 by electrostatic force can be suppressed. Thereby, the first web M5 is easily peeled off from the mesh belt 151 at a position where the mesh belt 151 is folded back by the stretching roller 152.

  The dividing unit 16 is disposed downstream of the humidifying unit 235. The subdivision unit 16 is a portion that performs a dividing step of dividing the first web M5 separated from the mesh belt 151. The subdivided portion 16 has a propeller 161 rotatably supported and a housing portion 162 for housing the propeller 161. Then, the first web M5 can be divided by the rotating propeller 161. The divided first web M5 becomes a subdivided body M6. Further, the subdivided body M6 descends in the housing portion 162.

  The housing portion 162 is connected to the humidifying portion 233. The humidifying unit 233 is configured of a vaporization type humidifier similar to the humidifying unit 231. Thus, humidified air is supplied into the housing portion 162. The humidified air can also prevent the subdivision body M6 from adhering to the propeller 161 and the inner wall of the housing portion 162 by electrostatic force.

  The mixing unit 17 is disposed downstream of the subdivision unit 16. The mixing part 17 is a part which performs the mixing process of mixing the subdivision M6 and the resin P1. The mixing unit 17 includes a resin supply unit 171, a pipe (flow passage) 172, and a blower 173.

  The pipe 172 connects the housing portion 162 of the subdivided portion 16 and the housing portion 182 of the loosening portion 18 and is a flow path through which the mixture M7 of the subdivided body M6 and the resin P1 passes.

  A resin supply unit 171 is connected in the middle of the pipe 172. The resin supply unit 171 has a screw feeder 174. By driving the screw feeder 174 to rotate, the resin P1 can be supplied to the tube 172 as powder or particles. The resin P1 supplied to the pipe 172 is mixed with the subdivision M6 to form a mixture M7.

  In addition, although resin P1 makes fibers bind in a later step, for example, a thermoplastic resin, a curable resin, etc. can be used, but it is preferable to use a thermoplastic resin. Examples of the thermoplastic resin include AS resin, ABS resin, polyethylene, polypropylene, polyolefin such as ethylene-vinyl acetate copolymer (EVA), modified polyolefin, acrylic resin such as polymethyl methacrylate, polyvinyl chloride, polystyrene, polyethylene Polyesters such as terephthalate and polybutylene terephthalate, nylon 6, nylon 46, nylon 66, nylon 610, nylon 612, nylon 11, nylon 12, nylon 6-12, nylon 6-66, etc. polyamide (nylon), polyphenylene ether, polyacetal , Polyether, polyphenylene oxide, polyetheretherketone, polycarbonate, polyphenylene sulfide, thermoplastic polyimide, polyetherimide, aromatic polyimide Various thermoplastic elastomers such as liquid crystal polymers such as esters, styrenes, polyolefins, polyvinyl chlorides, polyurethanes, polyesters, polyamides, polybutadienes, trans polyisoprenes, fluoro rubbers, chlorinated polyethylenes, etc. These may be used alone or in combination of two or more selected from these. Preferably, polyester or a resin containing this is used as the thermoplastic resin.

  In addition to the resin P1, for example, a colorant for coloring fibers, an aggregation inhibitor for suppressing aggregation of fibers and aggregation of the resin P1, and the like may be supplied from the resin supply unit 171. May be contained, for example, a flame retardant for making the sheet incombustible, and a paper strength agent for enhancing the paper strength of the sheet S. Alternatively, the resin P1 may be supplied from the resin supply portion 171 in advance (compounded) in which they are contained in the resin P1.

  Further, a blower 173 is installed in the middle of the pipe 172 on the downstream side of the resin supply unit 171. The subdivided body M6 and the resin P1 are mixed by the action of the rotating portion such as the blade of the blower 173. In addition, the blower 173 can generate an air flow toward the loosening unit 18. By this air flow, the subdivided body M6 and the resin P1 can be stirred in the pipe 172. Thus, the mixture M7 can flow into the loosening portion 18 in a state in which the subdivisions M6 and the resin P1 are uniformly dispersed. In addition, the subdivision M6 in the mixture M7 is loosened in the process of passing through the pipe 172 and becomes finer and fibrous.

  The loosening portion 18 is a portion of the mixture M7 that performs the step of loosening the entangled fibers. The loosening unit 18 includes a drum unit 181 and a housing unit 182 for housing the drum unit 181.

  The drum unit 181 is a screen formed in a cylindrical shape, and is a sieve that rotates about its central axis. The mixture M7 flows into the drum portion 181. Then, by rotating the drum unit 181, fibers and the like smaller than the mesh openings of the mixture M7 can pass through the drum unit 181. At that time, the mixture M7 will be loosened.

  In addition, the mixture M 7 loosened by the drum unit 181 drops while dispersing in air and travels to the second web forming unit 19 located below the drum unit 181. The second web forming unit 19 is a portion that performs a second web forming step of forming a second web M8 from the mixture M7. The second web forming unit 19 includes a mesh belt (separation belt) 191, a tension roller 192, and a suction unit (suction mechanism) 193.

  The mesh belt 191 is an endless belt, on which the mixture M7 is deposited. The mesh belt 191 is wound around four tension rollers 192. Then, the mixture M7 on the mesh belt 191 is conveyed to the downstream side by the rotational drive of the tension roller 192.

  Also, most of the mixture M7 on the mesh belt 191 has a size larger than the opening of the mesh belt 191. As a result, the mixture M7 is restricted from passing through the mesh belt 191, and can therefore be deposited on the mesh belt 191. Further, the mixture M <b> 7 is conveyed downstream together with the mesh belt 191 while being deposited on the mesh belt 191, and is thus formed as a layered second web M <b> 8.

  The suction unit 193 can suction air from below the mesh belt 191. This allows the mixture M7 to be sucked onto the mesh belt 191, thereby promoting the deposition of the mixture M7 on the mesh belt 191.

  A pipe (flow passage) 246 is connected to the suction portion 193. Further, a blower 263 is installed in the middle of the pipe 246. By the operation of the blower 263, suction can be generated at the suction portion 193.

  Note that each of the pipe 241, the pipe 242, the pipe 243, the pipe 244, the pipe 245, the pipe 246, and the pipe 172 may be configured as a single pipe, or may be configured as a connecting pipe connecting a plurality of pipes. It may be Further, the inner diameter of each tube is not particularly limited, but is preferably, for example, 20 mm or more and 200 mm or less.

  The housing portion 182 is connected to the humidifying portion 234. The humidifying unit 234 is configured of a vaporization type humidifier similar to the humidifying unit 231. Thus, humidified air is supplied into the housing portion 182. By the humidified air, the inside of the housing portion 182 can be humidified, and therefore, the mixture M7 can be suppressed from adhering to the inner wall of the housing portion 182 by electrostatic force.

  A humidifying unit 236 is disposed downstream of the loosening unit 18. The humidifying unit 236 is configured by an ultrasonic humidifier similar to the humidifying unit 235. Thus, the second web M8 can be supplied with water, and the water content of the second web M8 can be adjusted. By this adjustment, the adsorption of the second web M8 to the mesh belt 191 by electrostatic force can be suppressed. As a result, the second web M 8 is easily peeled off from the mesh belt 191 at the position where the mesh belt 191 is folded back by the tension roller 192.

  In addition, it is preferable that the moisture content (total moisture content) added to the humidification part 231-the humidification part 236 is 0.5 mass part or more and 20 mass parts or less with respect to 100 mass parts of materials before humidification, for example.

  A sheet forming unit 20 is disposed downstream of the second web forming unit 19. The sheet forming unit 20 is a portion that performs a sheet forming process of forming the sheet S from the second web M8. The sheet forming unit 20 includes a pressure unit 201 and a heating unit 202.

  The pressing unit 201 has a pair of calendar rollers 203, and can press the second web M8 between the calendar rollers 203 without heating (without melting the resin P1). This increases the density of the second web M8. Then, the second web M8 is conveyed toward the heating unit 202. One of the pair of calendar rollers 203 is a main driving roller driven by the operation of a motor (not shown), and the other is a driven roller.

  The heating unit 202 has a pair of heating rollers 204, and can heat and press the second web M8 between the heating rollers 204. By this heating and pressing, in the second web M8, the resin P1 is melted, and the fibers are bonded to each other through the melted resin P1. Thus, the sheet S is formed. Then, the sheet S is conveyed toward the cutting unit 210. Note that one of the pair of heating rollers 204 is a main driving roller driven by the operation of a motor (not shown), and the other is a driven roller.

  The cutting unit 210 is disposed downstream of the sheet forming unit 20. The cutting unit 210 is a portion that performs a cutting process of cutting the sheet S. The cutting unit 210 includes a first cutter 211 and a second cutter 212.

  The first cutter 211 cuts the sheet S in a direction intersecting the sheet S conveyance direction.

  The second cutter 212 cuts the sheet S in the direction parallel to the conveyance direction of the sheet S on the downstream side of the first cutter 211.

  By cutting the first cutter 211 and the second cutter 212, a sheet S having a desired size can be obtained. Then, the sheet S is further conveyed downstream and accumulated in the stock unit 220.

  As described above, the used paper recycling apparatus 100 includes the defibrated material conveying device 1. In the present embodiment, the defibrated material conveyance device 1 includes the defibrating unit 13, the sorting unit 14, the pipe 242 connecting the defibrating unit 13 and the sorting unit 14, and the blower 261 provided in the middle of the pipe 242. And consists of. In the defibrated material transport device 1, the defibrated material M 3 is transported in the pipe 242 by the air flow generated by the action of the blower 261.

  As shown in FIG. 2, the tube 242 (tube) has a plurality of curved portions (for example, elbows and U-tubes) formed by bending a middle part in the longitudinal direction of the tube 242 (tube). As a reason for forming a curved portion in the pipe 242, for example, when a path for conveying the fibrillated material M3 from the disintegrating portion 13 to the sorting portion 14 interferes with the equipment in the used paper recycling apparatus 100, this interference is prevented. In order to avoid the equipment, it may be mentioned. In addition, although the formation number of a curved part is multiple in this embodiment, it is not limited to this, One may be sufficient.

In addition, "curved portion 242a", "curved portion 242b", "curved portion 242c", "curved portion 242d", "curved portion 242e" sequentially from the upstream side to the downstream side of the tube 242 , "Curved portion 242f", "curved portion 242g", and "curved portion 242h". The curved portion 242a has a central angle of 180 ° centered on the center of curvature. Each of the curved portion 242b, the curved portion 242c, and the curved portion 242h has a central angle centered on the center of curvature of more than 90 ° and less than 180 °. Each of the bending portion 242d, the bending portion 242e, the bending portion 242f, and the bending portion 242g has a central angle of 90 ° around the center of curvature. In FIG. 4 representatively, in the case of the curved portion 242 f, the “curvature center” is the curvature center O _{242 f} , and the “center angle” is the center angle θ _{242 f} .

  Moreover, the groove | channel 3 which is mentioned later is formed in the curved part 242a-the curved part 242h, respectively. Hereinafter, the groove 3 in the curved portion 242 f will be representatively described.

  The defibrated material conveyance device 1 includes a blower 261 as an air flow generation source that generates an air flow in a pipe 242 (tube body). Thus, the defibrated material M3 can be transported from the defibrating unit 13 to the sorting unit 14 quickly and smoothly via the pipe 242. The speed of the air flow is not particularly limited, and is, for example, preferably 1 m / second to 20 m / second, and more preferably 10 m / second to 20 m / second. Also, the weight of the defibrated material M3 transported to the air stream is 10 g or more per 1 L of air? It is preferably 100 g or less, more preferably 50 g or more and 100 g or less.

  By the way, in each of the curved portions (representatively, the curved portion 242 f) of the tube 242, there is a possibility that the defibrated material M 3 may adhere to the inner surface 252 on the outer periphery 251 side. The cause thereof is, for example, the stagnation of the defibrated material M3 due to the decrease (flow) of the flow velocity in the curved portion 242f. FIG. 3 shows the distribution of the flow velocity in the curved portion 242f. In FIG. 3, the higher the flow velocity, the darker the color appears, and the lower the flow velocity, the lighter the color. As shown in FIG. 3, in the curved portion 242f, the flow velocity on the outer periphery 251 side is smaller than the flow velocity on the inner periphery 253 side. Further, as a cause of adhesion of the defibrated material M 3, in addition to the decrease of the flow velocity, there is, for example, static electricity or the like generated by friction with the defibrated material M 3.

  Once the defibrated material M3 adheres to the inner surface 252, another disaggregated material M3 (or filler) adheres to the deposited defibrated material M3 and tends to gradually grow (become larger) . Then, when the grown defibrated material M3 reaches a limit at which it can continue to be attached to the inner surface 252, it finally becomes so-called "dummy" and separates from the inner surface 252. In this case, for example, the following phenomenon may occur.

  The first phenomenon is that the dam is manufactured as it is as a part of the sheet S, and as a result, the thickness and the density of the sheet S become uneven.

  The second phenomenon is that the dam is clogged on the downstream side of the used paper recycling apparatus 100 and causes jamming in the used paper recycling apparatus 100.

  Therefore, the defibrated material conveyance device 1 is configured to prevent adhesion of the defibrated material M3 to each curved portion (typically, the curved portion 242f) of the tube 242. Below, this composition and operation are explained.

As shown in FIGS. 4, 5, and 7, a plurality of grooves 3 extending in the longitudinal direction of the tube 242 (tube) are formed on the inner surface 252 of the curved portion 242 f on the outer periphery 251 side. In particular, in the present embodiment, as shown in FIG. 6, the plurality of grooves 3 include the grooves 3 parallel to the central axis O ₂₄₂ of the pipe 242 (tube body). The number of grooves 3 formed is not particularly limited as long as it is two or more.

  By forming such a groove 3, it is possible to prevent or suppress a decrease in the flow velocity on the outer periphery 251 side in the curved portion 242 f, and the generation of a secondary flow (vortex) in the curved portion 242 f Can be relaxed. Such a rectifying effect causes the defibrated material M3 to flow downstream before adhering to the inner surface 252, thereby preventing the adhesion to the inner surface 252. As a result, as described above, it can be prevented that the thickness and the density of the sheet S become uneven, and the cause of jamming in the used paper recycling apparatus 100 can be prevented. Therefore, the used paper recycling apparatus 100 can operate stably, and can manufacture the sheet S having uniform thickness and density, that is, stable quality.

  Further, if at least one of the following conditions (numerical range) is satisfied, the adhesion preventing effect of the defibrated material M3 on the inner surface 252 is further improved. Moreover, the adhesion prevention effect of the defibrated material M3 will be remarkably improved, so that the conditions to satisfy increase, and increase.

The formation region A _3-1 of the groove 3 in the inner surface 252 of the tube 242 has the entire circumference of the inner circumferential surface of the tube 242 in a cross section orthogonal to the central axis O 242 (extension direction), that is, the normal direction of the sheet of FIG. 10% or more and 100% or less of the circumferential length L _252-1 of the inner surface 252 (curved portion 242f) corresponding to half of the length is preferably 30% or more and 100% or less (see FIG. 7) . By such a numerical range, the adhesion preventing effect of the defibrated material M3 on the inner surface 252 is further improved.

Forming regions _{A 3-2} grooves 3 in the inner surface 252 of the tube 242, the central axis _{O 242} with the maximum length of the long along the central axis _{O 242} direction of the inner surface 252 of _{L 252 - 2} (curved portion 242f (extension It is preferable that it is 50% or more and 100% or less of the total length of the part along the direction of existence), and it is more preferable that it is 70% or more and 100% or less. (See Figure 6). By such a numerical range, the adhesion preventing effect of the defibrated material M3 is further improved as described above.

  Moreover, as shown to FIG. 6, FIG. 8, the convex streak 4 extended in the extension direction of the pipe | tube 242 (pipe body) is formed between the adjacent groove | channels 3. As shown in FIG. The occupancy ratio of the groove 3 in the inner surface 252 (the region where the groove 3 is formed) (the ratio of the opening of the groove 3 to the inner surface 252) is preferably 6 times to 20 times the height of the ridge 4 It is more preferable that it is twice or less. With such a numerical range, the contact area of the inner surface 252 with respect to the defibrated material M3 can be reduced as much as possible. That is, the inner surface 252 is in a state where the defibrated material M3 is in point contact as much as possible. Thereby, even if the fibrillated material M3 once adheres to the inner surface 252, the fibrillated material M3 is rapidly peeled off from the inner surface 252 before it becomes lumps, and therefore, the adhesion to the inner surface 252 is prevented. .

The width W _{4 of the} ridge 4 is preferably 50% or less of the width W _{3 of the} groove 3 (the distance between the facing side surfaces 33), and more preferably 30% to 50% (see FIG. 8).

The depth _{D 3} of the groove 3 is preferably 200% or less than 50% of the width _{W 3} of the groove 3, more preferably 50% to 100% (see FIG. 8). In particular, although depending on the width W _{3 of the} groove 3, the depth D ₃ is preferably 30 μm or more and 300 μm or less, and more preferably 100 μm or more and 200 μm or less.

The distance between adjacent grooves 3 (pitch) _{P 3} is preferably at 35μm or 500μm or less, more preferably 100μm or more 300μm or less (see FIG. 8).

  Further, the cross-sectional shape of the bottom surface 32 of the groove 3 is rounded in the configuration shown in FIG. 8, that is, it has a semicircular arc shape, but it is not limited to this. It may also be bent.

The radius of curvature _{R 252} of the curved outer periphery 251 side of the inner surface 252 of 242f is preferably equal to or less than 50 times 1 times the inside diameter .phi.d ₂₄₂ of the tube 242 (tube), and even 20 times more than 50 times less More preferable. By such a numerical range, the adhesion preventing effect of the defibrated material M3 is further improved as described above. The “curvature radius R ₂₅₂ of the curved portion 242 f” refers to the curvature radius of the inner surface of the tubular body 242 on the outer peripheral side of the curved portion 242 f.

  As shown in FIGS. 4 and 5, the groove 3 has an extension 31 formed to extend also to the inner surface 255 on the upstream side (lower side in the drawing) than the inner surface 252 (curved portion 242f) There is. This extension 31 can prevent or suppress the decrease in the flow velocity even immediately before the defibrated material M 3 reaches the curved portion 242 f, and thus maintain the flow velocity in the curved portion 242 f as much as possible. it can. As a result, the fibrillated material M3 can rapidly cross the curved portion 242f, thereby contributing to the prevention of adhesion of the fibrillated material M3.

The length _{L 31} of the extension 31 is preferably equal to or less than 3 times 1x inner diameter .phi.d ₂₄₂ of the tube 242, and more preferably not more than 2 times 1 time (see FIG. 4). The length _{L 31} of the extension 31 may be a central axis _{O 242} comparable to the length _{L 252 - 2} along the direction of the inner surface 252. In addition, the extension part 31 may be abbreviate | omitted.

  The groove 3 may also be formed on the inner surface 254 of the curved portion 242 f on the inner periphery 253 side.

  Further, the method for forming the groove 3 is not particularly limited, and for example, a method by broaching, a method by blasting, a method by pressing, a method by laser processing, etc. can be used.

  Preferably, at least the inside of the curved portion 242a to the curved portion 242h of the pipe 242 is made of, for example, a metal material such as aluminum or stainless steel. The metal material is, for example, superior in slipperiness to the fibrillated material M3 than the resin material. Thereby, even if the fibrillated material M3 adheres to the curved portion 242a to the curved portion 242h, the adhesion can be suppressed as much as possible, and hence the fibrillated material M3 is rapidly removed from the curved portion 242a to the curved portion 242h can do. In addition, the whole pipe | tube 242 may be comprised with materials (for example, resin material) other than a metal material.

As described above, in all of the curved portions 242a to 242h, the central angle centering on the center of curvature of the inner surface on the outer peripheral side of the curved portion is more than 0 ° and not more than 180 °. And typically, central angle (theta) _{242 f} centering on curvature center O _{242 f} of the inner surface 252 by the side of the outer periphery 251 of the curved part 242 _f is 90 degrees. As a result, the tube 242 can avoid other equipment in the used paper recycling apparatus 100 and prevent interference with the equipment at the bending portion 242f.

In addition, the curvature center of "the curved part 242a-the curved part 242h (it is representatively below curved part 242f)" is a curvature center of the inner surface of the pipe body 242 of the outer peripheral side of the curved part 242f. For example, in FIG. 4, in the case of the curved portion 242f, the “curvature center” refers to the curvature center O _242f , and the “center angle” refers to the center angle θ _242f (see FIG. 4).

  When a curved portion is formed in the pipe 244 or the pipe 246, it is preferable that the groove 3 be formed in this curved portion.

Second Embodiment
FIG. 9 is a cross-sectional view showing a groove formed in the tube of the disintegrate transport device provided in the used paper recycling apparatus (second embodiment) of the present invention.

Hereinafter, the second embodiment of the tubular body, the defibrated material conveyance device and the used paper recycling device of the present invention will be described with reference to this figure, but differences from the above-described embodiments will be mainly described Will omit the description.
The present embodiment is the same as the first embodiment except that the cross-sectional shape of the groove is different.

As shown in FIG. 9, in the present embodiment, the groove 3 is such that the side surface 33 of the groove 3 in the first embodiment is omitted. Such a groove 3 is effective when it is desired to make the depth D ₃ shallow.

Third Embodiment
FIG. 10 is a view showing a formed state of a groove formed in a tube of a disintegrate transport device provided in the used paper recycling apparatus (third embodiment) of the present invention.

  Hereinafter, the third embodiment of the tubular body, the defibrated material conveyance device and the used paper recycling device of the present invention will be described with reference to this figure, but differences from the above-described embodiments will be mainly described Will omit the description.

  This embodiment is the same as the first embodiment except that the formation direction of the groove with respect to the central axis of the pipe is different.

As shown in FIG. 10, in the present embodiment, the plurality of grooves 3 formed to extend on the inner surface of the tube 242 (tube), relative to the central axis O ₂₄₂ of the tube 242 (tube), groove 3 inclined at an inclination angle theta ₃ within ± 30 ° is included. With such a groove 3 as well, it is possible to prevent or suppress a decrease in flow velocity on the outer periphery 251 side in the curved portion 242f, and to mitigate the generation of secondary flow (vortex) in the curved portion 242f. it can. And by such a rectification effect, adhesion of the defibrated material M3 to the inner surface 252 is prevented as in the first embodiment. As a result, it is possible to prevent the thickness and density of the sheet S from becoming uneven and causing jamming in the used paper recycling apparatus 100.

Further, in the plurality of grooves 3, that is, the grooves 3 inclined at the inclination angle θ ₃ , the grooves 3 crossing each other (hereinafter, one groove 3 is referred to as “groove 3 a” and the other groove 3 is “groove 3 b” Say) is included. Thereby, the groove 3a and the groove 3b form a spiral groove having a winding direction opposite to each other. For example, when one of the grooves 3a and 3b is omitted, a swirling flow along the other groove is generated in the tube 242, and the fibrillated material M3 tends to adhere to the inner surface 252. May be However, in the inner surface 252, both the groove 3a and the groove 3b are formed. As a result, the swirling flow along the groove 3a and the swirling flow along the groove 3b cancel each other, so that it is possible to eliminate the state in which the fibrillated material M3 is easily attached to the inner surface 252. .

In the present embodiment, the plurality of grooves 3 may include the grooves 3 parallel to the central axis O ₂₄₂ of the pipe 242 as described in the first embodiment.

  As mentioned above, although the tube body of the present invention, a disintegrate transport device, and a waste paper recycling device have been described with reference to the illustrated embodiment, the present invention is not limited thereto, a tube, disintegrate transport device and waste paper Each part which comprises a reproducing | regenerating apparatus can be substituted by the thing of arbitrary structures which can exhibit the same function. Also, any component may be added.

  In addition, the tubular body, the defibrated material conveyance device, and the used paper recycling apparatus of the present invention may be a combination of any two or more configurations (features) of the respective embodiments.

DESCRIPTION OF SYMBOLS 100 ... waste paper recycling apparatus (sheet manufacturing apparatus), 1 ... disaggregated material conveyance apparatus, 3 ... groove, 3a ... groove, 3b ... groove, 31 ... extension part, 32 ... bottom surface, 33 ... side surface, 4 ... convex line, 11 ... Raw material supply unit, 12 ... crushing unit, 121 ... crushing blade, 122 ... chute (hopper), 13 ... defibrillation unit, 14 ... sorting unit, 141 ... drum unit (sieve unit), 142 ... housing unit, 15 ... 1st web formation part, 151 ... mesh belt, 152 ... tension roller, 153 ... suction part (suction mechanism), 16 ... subdivision part, 161 ... propeller, 162 ... housing part, 17 ... mixing part, 171 ... resin supply Sections 172: tubes (flow paths) 173: blowers 174: screw feeders 18: loosening sections 181: drum sections 182: housing sections 19: second web forming section 191: mesh belt (separation belt) 192: tension roller, 193: suction unit (suction mechanism), 20: sheet forming unit, 201: pressing unit, 202: heating unit, 203: calender roller, 204: heating roller, 210: cutting unit, 211: first 1 cutter, 212: second cutter, 220: stock unit, 231: humidifying unit, 232: humidifying unit, 233: humidifying unit, 234: humidifying unit, 235: humidifying unit, 236: humidifying unit, 241: pipe (flow path , 242: tube (flow passage), 242a: curved portion, 242b: curved portion, 242c: curved portion, 242d: curved portion, 242e: curved portion, 242f: curved portion, 242g: curved portion, 242h: curved portion, 243: pipe (flow path), 244: pipe (flow path), 245: pipe (flow path), 246: pipe (flow path), 251: outer circumference, 252: inner surface, 253: inner circumference, 254: inner surface, 255 ... inside , 261 ... blower, 262 ... blower, 263 ... blower, 27 ... recovery unit, _{A 3-1 ...} forming region, _{A 3-2 ...} forming region, D 3 _... depth, L _{31 ... length, L 252 - 1} ... length, L _252-2 ... length, M 1 ... raw material, M 2 ... coarse fragments, M 3 ... defibrated material, M 4-1 ... first sorted matter, M 4-2 ... second sorted matter, M 5 ... first web , M6 ... subdivision, M7 ... mixture, M8 ... second web, O ₂₄₂ ... central axis, O _{242 f} ... center of curvature, P1 ... resin, P ₃ ... interval (pitch), R ₂₅₂ ... radius of curvature, S ... sheet, W ₃ ... width, W ₄ ... width, θ ₃ ... inclination angle, θ _{242 f} ... central angle, φ _{d 242} ... inner diameter

Claims (12)

A tubular body for conveying defibrated material containing defibrated fibers by air flow,
The tube body has a curved portion formed by bending in the middle of the extending direction,
A plurality of grooves extending in the extending direction of the tube are formed on the inner surface of the tube on the outer peripheral side of the curved portion.   The tube according to claim 1, wherein the plurality of grooves include grooves parallel to a central axis of the tube.   The groove according to claim 1 or 2, wherein the plurality of grooves formed to extend on the inner surface of the pipe body include grooves inclined within ± 30 ° with respect to the central axis of the pipe body. Tube body.   The tube according to claim 3, wherein the plurality of grooves include grooves intersecting each other.   The tube according to any one of claims 1 to 4, wherein the formation region of the groove on the inner surface of the tube is 10% or more and 100% or less in a circumferential direction in a cross section orthogonal to the extending direction.   The formation region of the groove in the inner surface of the tube body is 50% or more and 100% or less of the total length of the portion along the extending direction which is the maximum length of the curved portion. Tube body as described in. Between the grooves adjacent to each other, a ridge extending in the extending direction of the tube is formed,
The tubular body according to any one of claims 1 to 6, wherein an occupancy rate of the groove in a formation area of the groove is 6 times or more and 20 times or less of the convex stripe.   The pipe according to any one of claims 1 to 7, wherein the groove is also formed on the inner surface upstream of the curved portion.   The tube according to any one of claims 1 to 8, wherein a radius of curvature of the curved portion is at least one time and at most 50 times an inner diameter of the tube.   The tube body according to any one of claims 1 to 9, wherein a central angle centered on the curvature center of the curved portion is more than 0 ° and not more than 180 °. A tube according to any one of the preceding claims,
An air flow generation source connected to the tube and generating an air flow in the tube; And a defibrillation section for decomposing used waste paper,
The used paper recycling apparatus according to claim 11, wherein the separated material obtained by the separation unit is transported.

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