Miniaturization device

Abstract

The present invention provides a micronizing device capable of performing smooth and excellent micronizing. The micronizing device is characterized by comprising: a housing; an impeller having a rotation axis, a first impeller portion located on the inlet side, a second impeller portion located on the outlet side, and a partition wall, and disposed within the housing; and a liner disposed on the inner surface of the housing along the outer circumference of the impeller. The first impeller portion has a plurality of first blades, which are open toward the inlet side and radially arranged around the rotation axis with gaps defined by the partition wall between them. The second impeller portion has a plurality of second blades, which are radially arranged around the rotation axis. As the impeller rotates, raw material introduced from the inlet is micronized as it passes sequentially through the gaps and between adjacent first blades, and then between the first blades and the liner, and then between the second blades and the liner, and is discharged from the outlet.

Description

Technical Field

[0001] The present invention relates to a miniaturized device. Background Art

[0002] A sheet manufacturing device is known, which includes a coarse shredding section for coarsely shredding waste paper, a defibration section for defibration of the coarse shreds obtained in the coarse shredding section, an accumulation section for stacking the defibrated material obtained in the defibration section on a flat surface, a heating and pressurizing section for heating and pressurizing the stacked sheets, a cutting section for cutting the sheets obtained in the heating and pressurizing section into a predetermined shape, and a sheet recovery section for recovering the obtained sheets.

[0003] As the defibration unit, for example, a turbine-type fine pulverizer such as that described in Patent Document 1 can be used. The turbine-type fine pulverizer of Patent Document 1 comprises a housing having a raw material inlet and a pulverized product outlet, a lining provided on the inner surface of the housing, and an impeller rotating within the housing. As the raw material passes between the rotating impeller and the lining, it is pulverized, and the pulverized material is discharged from the pulverized product outlet.

[0004] However, in the turbine-type fine pulverizer described in Patent Document 1, the gap between the impeller and the liner is narrow, and there is a possibility that the raw material, depending on its size, will not enter between the impeller and the liner, but will be retained near the front side of the impeller. If this retention occurs, the raw material cannot be finely pulverized properly.

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 11-276916 Summary of the Invention

[0006] The micronizing device of the present invention comprises:

[0007] A box body having a raw material input port and a discharge port;

[0008] an impeller having a rotation shaft, a first impeller portion located on the inlet side, a second impeller portion located on the outlet side, and a partition wall separating the first impeller portion from the second impeller portion, and arranged inside the casing;

[0009] a lining arranged on the inner surface of the casing along the outer periphery of the impeller,

[0010] The first impeller unit includes a plurality of first blades, which are open toward the inlet and are radially arranged around the rotation axis via gaps partitioned by the partition wall.

[0011] The second impeller portion includes a plurality of second blades, and the plurality of second blades are radially arranged around the rotation axis.

[0012] While the impeller is rotating, the raw material fed from the inlet is atomized while passing through the gap and between the adjacent first blades, between the first blades and the liner, and between the second blades and the liner, and is discharged from the discharge port. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 1 is a diagram schematically showing the configuration of a sheet manufacturing apparatus including a micronizing apparatus according to a first embodiment of the present invention.

[0014] Figure 2 for Figure 1 A longitudinal cross-sectional view of the micronization device is shown.

[0015] Figure 3 for Figure 2 AA line section view in.

[0016] Figure 4 for Figure 2 BB line section view in.

[0017] Figure 5 It is a longitudinal sectional view of a micronization device according to a second embodiment.

[0018] Figure 6 It is a cross-sectional view of a miniaturization device according to a third embodiment. DETAILED DESCRIPTION

[0019] Hereinafter, the miniaturization device of the present invention will be described in detail based on preferred embodiments shown in the accompanying drawings.

[0020] First embodiment

[0021] Figure 1 1 is a diagram schematically showing the configuration of a sheet manufacturing apparatus including a micronizing apparatus according to a first embodiment of the present invention. Figure 2 for Figure 1 A longitudinal cross-sectional view of the micronized device is shown. Figure 3 for Figure 2 AA line section view in. Figure 4 for Figure 2 BB line section view in.

[0022] In addition, in the following text, sometimes Figure 1 The upper side of a is referred to as "upper" or "above", and the lower side is referred to as "lower" or "below". Figure 2 as well as Figure 5 The left side of is called "left", and the right side is called "right". Figure 1This is a schematic structural diagram, and the positional relationship, orientation, size, etc. of each part of the sheet manufacturing apparatus 100 are not limited to the contents shown in the figure. Figure 1 In the diagram, the direction in which the coarse fragments M2, the defibrated material M3, the first screened material M4-1, the second screened material M4-2, the first web M5, the fine particles M6, the mixture M7, the second web M8, and the recycled paper S are conveyed, that is, the direction indicated by the arrow is also referred to as the conveying direction. Figure 1 The top side of the arrow mark in the figure is also called the "downstream side" in the conveying direction. Figure 1 The base end side indicated by the arrow in FIG. 1 is also referred to as the “upstream side” in the conveying direction.

[0023] Figure 1 The sheet manufacturing apparatus 100 shown is a sheet manufacturing apparatus 100 that produces sheet-shaped recycled paper S from a raw material M1 that is waste paper such as used copy paper.

[0024] like Figure 1 As shown, the sheet manufacturing device 100 includes a raw material supply unit 11, a coarse crushing unit 12, a micronizing device 13 of the present invention, a screening unit 14, a first sheet forming unit 15, a fine segmentation unit 16, a mixing unit 17, a dispersion unit 18, a second sheet forming unit 19, a forming unit 20, a cutting unit 21, a material preparation unit 22 and a recovery unit 27.

[0025] The sheet manufacturing apparatus 100 also 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 . The sheet manufacturing apparatus 100 also includes a blower 261 , a blower 262 , and a blower 263 .

[0026] In the sheet manufacturing apparatus 100 , a raw material supplying step, a coarse crushing step, a defibration step, a screening step, a first web forming step, a dividing step, a mixing step, a disassembling step, a second web forming step, a sheet forming step, and a cutting step are performed in this order.

[0027] The following describes the structure of each part.

[0028] The raw material supply section 11 is a section for implementing the raw material supply process of supplying the raw material M1 to the coarse crushing section 12. As the raw material M1, it is a sheet-like material composed of a fiber-containing material containing cellulose fibers. In addition, the cellulose fibers only need to be a fibrous material having cellulose as a compound (cellulose in a narrow sense) as a main component, and in addition to cellulose (cellulose in a narrow sense), it may also contain hemicellulose and lignin. In addition, the raw material M1 may be a woven fabric, a non-woven fabric, etc., and its form is any form. In addition, the raw material M1 may be, for example, recycled paper produced by defiberizing waste paper, or YUPO paper (registered trademark) of synthetic paper, or it may not be recycled paper.

[0029] The coarse crushing unit 12 is a portion that performs a coarse crushing process of coarsely crushing the raw material M1 supplied from the raw material supply unit 11 in a gas such as the atmosphere. The coarse crushing unit 12 includes a pair of coarse crushing blades 121 and a chute 122 .

[0030] The pair of coarse crushing blades 121 rotate in opposite directions, thereby coarsely crushing the raw material M1 between them, that is, cutting the raw material M1 into coarse fragments M2. The shape and size of the coarse fragments M2 are preferably suitable for the defibration process in the micronizing device 13. Examples of the shape of the coarse fragments M2 include small pieces with a square planar shape, rectangular pieces, and particularly long and narrow strips. Furthermore, the size of the coarse fragments M2 is preferably small pieces with an average side length of 100 mm or less, more preferably 3 mm to 70 mm or less. The shape of the fragments may also be shapes other than square and rectangular. Furthermore, the thickness is preferably 0.07 mm to 0.10 mm.

[0031] The chute 122 is disposed below the pair of coarse crushing blades 121 and has, for example, a funnel shape, so that the chute 122 can receive the coarse fragments M2 that have fallen down after being coarsely crushed by the coarse crushing blades 121 .

[0032] A humidifier 231 is located above the chute 122, adjacent to the pair of coarse-crushing blades 121. The humidifier 231 humidifies the coarse fragments M2 within the chute 122. The humidifier 231 comprises a vaporization-type (or warm air vaporization-type) humidifier having a filter (not shown) containing moisture. The humidifier supplies humidified air with increased humidity to the coarse fragments M2 by passing air through the filter. Supplying humidified air to the coarse fragments M2 prevents the coarse fragments M2 from adhering to the chute 122 and other surfaces due to static electricity.

[0033] The chute 122 is connected to the upstream side of the micronizing device 13 via the pipe 241. That is, the downstream end of the pipe 241 is connected to the inlet 31 of the micronizing device 13. The coarse fragments M2 accumulated in the chute 122 pass through the pipe 241 and are transported to the micronizing device 13.

[0034] like Figure 1 As shown, the micronizing device 13 is a section that performs the defibration process, defibrating the coarse fragments M2 in a gaseous, i.e., dry, manner. The defibration process in the micronizing device 13 produces a defibrated material M3 from the coarse fragments M2. Here, "defibration" means breaking down the coarse fragments M2, which consist of multiple fibers bound together, into individual fibers. This broken material becomes the defibrated material M3. The defibrated material M3 is in the form of a thread or ribbon. Alternatively, the defibrated material M3 may be in a lumpy, entangled state, forming a so-called "clump."

[0035] Furthermore, the micronizing device 13 generates a flow of air, i.e., an airflow, from the coarse crushing section 12 toward the screening section 14 by rotating the impeller 5 (described later). This allows the coarse crushing fragments M2 to be introduced from the pipe 241 to the upstream side of the micronizing device 13, and after defibration, the defibrated material M3 can be discharged to the screening section 14 via the pipe 242.

[0036] A tube 242 is connected to the downstream side of the micronizing device 13. A blower 261, such as a turbofan, is provided midway along the tube 242. The blower 261 is an airflow generator that generates airflow toward the screening section 14. This facilitates the introduction of the coarse fragments M2 into the micronizing device 13 and the discharge of the defibrated material M3 from the screening section 14. As will be described later, the micronizing device 13 smoothly passes the coarse fragments M2, serving as the raw material, through the micronizing device 13 and undergoes defibration. However, the operation of the blower 261, located downstream of the micronizing device 13, further facilitates the passage of the coarse fragments M2 through the micronizing device 13 and their defibration. Alternatively, the blower 261 may be provided upstream of the micronizing device 13.

[0037] The screening unit 14 performs a screening process for sorting the defibrated material M3 according to fiber length. In the screening unit 14, the defibrated material M3 is sorted into a first fraction M4-1 and a second fraction M4-2, which has a larger fiber length than the first fraction M4-1. The first fraction M4-1 is a material of a size suitable for subsequent production of recycled paper S, and its average fiber length is as described above. Meanwhile, the second fraction M4-2 may contain, for example, inadequately defibrated material or excessively agglomerated defibrated fibers.

[0038] The screening unit 14 includes a drum unit 141 and a housing unit 142 that houses the drum unit 141 .

[0039] The drum 141 is a screen composed of a cylindrical mesh that rotates about its central axis. The defibrated material M3 flows into the drum 141. As the drum 141 rotates, defibrated material M3 smaller than the mesh openings of the mesh is screened out as the first screening material M4-1, while defibrated material M3 larger than the mesh openings of the mesh is screened out as the second screening material M4-2.

[0040] The first screened material M4 - 1 falls from the drum portion 141 .

[0041] Meanwhile, the second sieved material M4-2 is fed into a tube 243 connected to the drum unit 141. The end of the tube 243, on the opposite side from the drum unit 141, i.e., on the downstream side, is connected midway along the tube 241. The second sieved material M4-2, having passed through the tube 243, merges with the coarse fragments M2 within the tube 241 and flows into the micronizing device 13 along with the coarse fragments M2. Thus, the second sieved material M4-2 is returned to the micronizing device 13 and defibrated along with the coarse fragments M2.

[0042] The first screened material M4-1 that falls from the drum unit 141 falls while being dispersed in the air and lands on the first web forming unit 15 located below the drum unit 141. The first web forming unit 15 is a portion that performs the first web forming process for forming the first web M5 from the first screened material M4-1. The first web forming unit 15 includes a mesh belt 151, three tension rollers 152, and a suction unit 153.

[0043] The mesh belt 151 is an endless belt on which the first screening material M4-1 is accumulated. The mesh belt 151 is wound around three suspension rollers 152. The suspension rollers 152 are driven to rotate, thereby conveying the first screening material M4-1 on the mesh belt 151 to the downstream side.

[0044] The first material M4-1 is larger than the mesh openings of the mesh belt 151. This restricts the first material M4-1 from passing through the mesh belt 151, allowing it to accumulate on the mesh belt 151. Furthermore, as the first material M4-1 accumulates on the mesh belt 151 and is conveyed downstream along with the mesh belt 151, it is formed into a layered first web M5.

[0045] Furthermore, the first screened material M4-1 may contain fly ash or dust. Fly ash or dust may be generated by crushing or defibration, for example. Such fly ash or dust is recovered in the recovery unit 27 described later.

[0046] The suction unit 153 is a suction mechanism that sucks air from below the mesh belt 151. Thus, fly ash and dust that have passed through the mesh belt 151 can be sucked together with the air.

[0047] Moreover, the suction part 153 is connected to the recovery part 27 via the pipe 244. The fly ash and dust sucked by the suction part 153 are recovered in the recovery part 27.

[0048] A pipe 245 is also connected to the recovery section 27. A blower 262 is also installed midway along the pipe 245. The operation of the blower 262 generates a suction force in the suction section 153. This promotes the formation of the first web M5 on the mesh belt 151. This first web M5 becomes the removed material, such as fly ash or dust. Furthermore, the fly ash or dust is transported through the pipe 244 by the operation of the blower 262 and reaches the recovery section 27.

[0049] The housing 142 is connected to the humidifying unit 232. The humidifying unit 232 is composed of a vaporizing humidifier. Thus, humidified air is supplied to the housing 142. This humidified air humidifies the first object M4-1, thereby preventing the first object M4-1 from adhering to the inner wall of the housing 142 due to static electricity.

[0050] A humidifier 235 is located downstream of the screening unit 14. The humidifier 235 is comprised of an ultrasonic humidifier that atomizes water. This allows moisture to be supplied to the first web M5, thereby regulating the moisture content of the first web M5. This regulation suppresses static electricity-induced adsorption of the first web M5 to the mesh belt 151. This allows the first web M5 to be easily peeled from the mesh belt 151 at the point where the mesh belt 151 is folded back by the tension rollers 152.

[0051] The subdividing section 16 is located downstream of the humidifying section 235. This section performs the segmentation process of segmenting the first web M5 peeled from the mesh belt 151. The subdividing section 16 includes rotatably supported rotating blades 161 and a housing 162 that houses the rotating blades 161. The rotating rotating blades 161 segment the first web M5. The segmented first web M5 becomes subdivided pieces M6. The subdivided pieces M6 then descend within the housing 162.

[0052] The housing 162 is connected to the humidifying unit 233. The humidifying unit 233 is composed of a vaporizing humidifier. Thus, humidified air is supplied to the housing 162. This humidified air prevents the fine particles M6 from adhering to the rotating blades 161 or the inner wall of the housing 162 due to static electricity.

[0053] A mixing section 17 is disposed downstream of the subdividing section 16 . The mixing section 17 is a section for performing a mixing process of the subdivided body M6 and the additive. The mixing section 17 includes an additive supply section 171 , a pipe 172 , and a blower 173 .

[0054] The pipe 172 is a flow passage that connects the housing portion 162 of the subdividing unit 16 and the housing 182 of the dispersing unit 18 and allows the mixture M7 of the subdivided body M6 and the additive to pass therethrough.

[0055] An additive supply unit 171 is connected midway along the tube 172. The additive supply unit 171 includes a housing 170 that contains the additive and a screw feeder 174 disposed within the housing 170. The rotation of the screw feeder 174 squeezes the additive from the housing 170 and supplies it into the tube 172. The additive supplied into the tube 172 is mixed with the fine particles M6 to form a mixture M7.

[0056] Examples of additives supplied from the additive supply unit 171 include binders for bonding fibers together, colorants for coloring fibers, coagulation inhibitors for inhibiting fiber aggregation, flame retardants for making fibers less flammable, paper strengthening agents for increasing the strength of recycled paper S, and defibrated materials. One or more of these may be used in combination. The following describes an example in which the additive is binder P1. By including a binder material that bonds fibers together in the additive, the strength of the recycled paper S can be improved.

[0057] Examples of the binder P1 include naturally occurring ingredients such as starch, dextrin, glycogen, amylose, hyaluronic acid, kudzu, konjac, pig tooth pollen, etherified starch, esterified starch, natural glue, fiber-sensing paste, seaweed, and animal protein, as well as polyvinyl alcohol, polyacrylic acid, and polyacrylamide. Any one of these ingredients or a combination of two or more can be used, but naturally occurring ingredients are preferred, with starch being more preferred. Furthermore, thermoplastic resins such as various polyolefins, acrylic resins, polyvinyl chloride, polyesters, and polyamides, and various thermoplastic elastomers can also be used.

[0058] Furthermore, the substances supplied from the additive supply unit 171 may include, in addition to the binder P1, a colorant for coloring the fibers, an aggregation inhibitor for suppressing aggregation of the fibers or the binder P1, a flame retardant for making the fibers less flammable, a paper strengthening agent for increasing the strength of the recycled paper S, and the like. Alternatively, the additive supply unit 171 may supply a compounded substance containing the above substances in the binder P1.

[0059] A blower 173 is also provided midway along the tube 172, downstream of the additive supply section 171. The rotating components, such as the blades, of the blower 173 promote mixing of the fine particles M6 and the binder P1. Furthermore, the blower 173 generates an airflow directed toward the dispersing section 18. This airflow stirs the fine particles M6 and the binder P1 within the tube 172. Consequently, the mixture M7 can be transported to the dispersing section 18 with the fine particles M6 and the binder P1 uniformly dispersed. Furthermore, the fine particles M6 in the mixture M7 are disintegrated into finer fibers as they pass through the tube 172.

[0060] The blower 173 is electrically connected to the control device 28 so that its operation is controlled. By adjusting the air flow rate of the blower 173, the amount of air fed into the drum 181 can be adjusted.

[0061] Although not shown, the end portion of the tube 172 on the roller 181 side branches into two, and each of the branched ends is connected to an inlet (not shown) formed on the end surface of the roller 181 .

[0062] Figure 1 The distributing unit 18 shown is a portion for performing a feeding process of untangling and feeding the entangled fibers in the mixture M7. The distributing unit 18 includes a drum 181 for introducing and feeding the defibrated mixture M7, and a housing 182 for housing the drum 181.

[0063] Drum 181 is a screen composed of a cylindrical mesh that rotates about its central axis. The rotation of drum 181 allows fibers in the mixture M7 that are smaller than the mesh openings to pass through drum 181. This disintegrates the mixture M7 and releases it along with the air. In other words, drum 181 functions as a discharge unit for discharging the fiber-containing material.

[0064] The drum 181 is connected to a driving source (not shown) and rotated by a rotational force output from the driving source. The driving source is electrically connected to the control device 28 so that the operation thereof is controlled.

[0065] Furthermore, housing 182 is connected to humidifying unit 234. Humidifying unit 234 is a vaporizing humidifier. Thus, humidified air is supplied to housing 182. This humidified air humidifies the interior of housing 182, thereby preventing the mixture M7 from adhering to the inner wall of housing 182 due to static electricity.

[0066] The mixture M7 released by the drum 181 falls while being dispersed in the air and falls toward the second web forming unit 19 located below the drum 181. The second web forming unit 19 is a portion for performing a stacking process in which the mixture M7 is stacked to form a second web M8 as a stack. The second web forming unit 19 includes a mesh belt 191, a tension roller 192, and a suction unit 193.

[0067] The mesh belt 191 is a mesh-like member and, in the illustrated configuration, is an endless belt. The mixture M7 dispersed and released by the dispersing unit 18 is deposited on the mesh belt 191. The mesh belt 191 is wound around four suspension rollers 192. The rotation of the suspension rollers 192 transports the mixture M7 on the mesh belt 191 downstream.

[0068] In the illustrated configuration, the mesh belt 191 is used as an example of a mesh member. However, the present invention is not limited thereto, and may be, for example, a flat plate-like member.

[0069] Furthermore, most of the mixture M7 on the mesh belt 191 is larger than the mesh openings of the mesh belt 191. Therefore, the mixture M7 is restricted from passing through the mesh belt 191, and can be deposited on the mesh belt 191. Furthermore, since the mixture M7 is deposited on the mesh belt 191 and conveyed downstream along with the mesh belt 191, it is formed into a layered second web M8.

[0070] The suction unit 193 is a suction mechanism that sucks air from below the mesh belt 191. This allows the mixture M7 to be sucked onto the mesh belt 191, thereby promoting the accumulation of the mixture M7 on the mesh belt 191.

[0071] A tube 246 is connected to the suction portion 193. A blower 263 is provided in the middle of the tube 246. The operation of the blower 263 generates a suction force in the suction portion 193.

[0072] A humidifier 236 is located downstream of the dispersing section 18. The humidifier 236 is comprised of an ultrasonic humidifier, similar to the humidifier 235. This allows moisture to be supplied to the second web M8, thereby regulating the moisture content of the second web M8. This regulation suppresses static electricity-induced adsorption of the second web M8 to the mesh belt 191. Consequently, the second web M8 is easily peeled off the mesh belt 191 at the point where the mesh belt 191 is folded back by the tension rollers 192.

[0073] The total amount of water added to the humidifying sections 231 to 236 is preferably, for example, 0.5 parts by mass or more and 20 parts by mass or less relative to 100 parts by mass of the material before humidification.

[0074] A forming section 20 is disposed downstream of the second web forming section 19 . The forming section 20 is a section that performs a sheet forming process for forming the recycled paper S from the second web M8 . The forming section 20 includes a pressurizing section 201 and a heating section 202 .

[0075] The pressurizing unit 201 includes a pair of calendering rollers 203, and is capable of pressurizing the second web M8 between the calendering rollers 203 without heating. This increases the density of the second web M8. Furthermore, when heating is performed, the degree of heating is preferably such that the adhesive P1 does not melt. Furthermore, the second web M8 is conveyed toward the heating unit 202. Furthermore, one of the pair of calendering rollers 203 is a driving roller driven by a motor (not shown), and the other is a driven roller.

[0076] The heating unit 202 includes a pair of heating rollers 204, which heat and pressurize the second web M8 between the heating rollers 204. This heating and pressurizing melts the binder P1 within the second web M8, bonding the fibers together via the melted binder P1. This forms recycled paper S, which is then conveyed toward the cutting unit 21. One of the pair of heating rollers 204 is a primary roller driven by a motor (not shown), while the other is a secondary roller.

[0077] A cutting unit 21 is disposed downstream of the forming unit 20 . The cutting unit 21 is a portion that performs a cutting process for cutting the recycled paper S. The cutting unit 21 includes a first shear 211 and a second shear 212 .

[0078] The first cutter 211 is a member that cuts the recycled paper S in a direction intersecting the conveyance direction of the recycled paper S, particularly in a direction perpendicular thereto.

[0079] The second cutter 212 is located downstream of the first cutter 211 and cuts the recycled paper S in a direction parallel to the conveying direction of the recycled paper S. This cutting removes unnecessary portions at both ends of the recycled paper S in the width direction, thereby aligning the width of the recycled paper S.

[0080] The recycled paper S having a desired shape and size is obtained by the cutting by the first cutter 211 and the second cutter 212 . The recycled paper S is further conveyed to the downstream side and stored in the paper preparation unit 22 .

[0081] Each component included in the sheet manufacturing apparatus 100 is electrically connected to the control device 28 . The operation of each component is controlled by the control device 28 .

[0082] like Figure 1 As shown, the control device 28 includes a control unit 281 , a storage unit 282 , and a communication unit 283 .

[0083] The control unit 281 includes at least one processor for executing various programs stored in the storage unit 282. A CPU (Central Processing Unit) can be used as the processor, for example. Furthermore, the control unit 281 has various functions in the sheet manufacturing apparatus 100, including controlling the drive of the blower 261, controlling the drive of various parts of the apparatus related to sheet manufacturing, and controlling the drive of the motor M (described later).

[0084] The controller 281 controls the power supply to the blower 261 and the motor M, causing them to rotate at predetermined speeds at predetermined timings. Furthermore, the blower 261 and the motor M are preferably driven in a manner that roughly overlaps in time. This facilitates smooth passage of the raw material through the atomizing device 13 and facilitates efficient defibration.

[0085] The storage unit 282 stores programs related to sheet production, for example. Regarding the atomization of the material by the atomization device 13 , a program related to the operating procedure including operating timing and rotation speed conditions of the blower 261 and the motor M is stored.

[0086] The communication unit 283 is constituted by, for example, an I / O interface, and communicates with each unit of the sheet manufacturing apparatus 100. The communication unit 283 also has a function of communicating with, for example, a computer or server (not shown) via a network.

[0087] The control device 28 may be built into the sheet manufacturing apparatus 100 or provided in an external device such as an external computer. Furthermore, the control unit 281 and the storage unit 282 may be integrated into a single unit, for example. Alternatively, the control unit 281 may be built into the sheet manufacturing apparatus 100 and the storage unit 282 may be provided in an external device such as an external computer. Alternatively, the storage unit 282 may be built into the sheet manufacturing apparatus 100 and the control unit 281 may be provided in an external device such as an external computer.

[0088] Next, the structure of the miniaturization device 13 will be described.

[0089] like Figure 2 As shown, the micronizing device 13 is a device that micronizes the supplied raw material and discharges the micronized product. In this embodiment, it is a defibration device that defibrates the supplied coarse chips M2 to produce defibrated products M3.

[0090] Being installed in Figure 1 In the micronizing device 13 of the thin film manufacturing apparatus 100 shown, the raw material introduced is mixed with the coarse fragments M2 and the second screened material M4-2. However, since the amount of the second screened material M4-2 in the raw material is smaller than that of the coarse fragments M2, the raw material introduced will be described below as the coarse fragments M2.

[0091] The micronizing device 13 includes a housing 3, a liner 4 disposed on the inner surface of the housing 3, an impeller 5 rotatably disposed within the housing 3, and a motor M for rotating the impeller 5. The coarse fragments M2 are defibrated while passing between the outer periphery of the rotating impeller 5 and the liner 4, thereby forming a defibrated product M3.

[0092] The housing 3 has an inlet 31 for feeding the coarse chips M2 into the housing 3 and an outlet 32 ​​for discharging the generated defibrated material M3 out of the housing 3. The housing 3 is a cylindrical member having an internal space S0 for accommodating the liner 4 and the impeller 5.

[0093] The inlet 31 is provided at the side near the left end of the box body 3. In addition, the inlet 31 is provided in a manner protruding cylindrically toward the radially outer side of the box body 3. The inlet 31 is connected to Figure 1 At the downstream end portion of the illustrated pipe 241 , the coarse crushing pieces M2 generated in the coarse crushing unit 12 are fed into the housing 3 from the feed port 31 via the pipe 241 .

[0094] The discharge port 32 is provided at the side near the right end of the housing 3. The discharge port 32 is provided so as to protrude cylindrically toward the radially outer side of the housing 3. The discharge port 32 is connected to the Figure 1The defibrated material M3 generated at the upstream end of the illustrated pipe 242 is discharged to the outside of the housing 3 and is conveyed to the screening unit 14 through the pipe 242 .

[0095] The positions of the inlet 31 and the outlet 32 ​​in the circumferential direction of the housing 3 are the same. However, the present invention is not limited to this structure, and the positions of the inlet 31 and the outlet 32 ​​may be staggered by a predetermined angle or may be on opposite sides.

[0096] The housing 3 also includes a partition plate 33 and a partition plate 34 disposed within the internal space S0. The partition plate 33 is disposed on an extension of the inlet 31, with its thickness oriented along the rotation axis 50. The partition plate 34 is disposed on an extension of the outlet 32, with its thickness oriented along the rotation axis 50. The partition plates 33 and 34 are arranged substantially parallel to each other. The ends of the partition plates 33 and 34 on the rotation axis 50 side are separated from the rotation axis 50.

[0097] The partition plate 33 allows the coarse debris M2 introduced from the inlet 31 to be guided to the vicinity of the rotating shaft 50. This allows the effects of the present invention, described below, to be more reliably achieved. Furthermore, the partition plate 34 allows the generated defibrated material M3 to be effectively guided to the discharge port 32. This allows for smoother discharge of the defibrated material M3.

[0098] The lining 4 is a cylindrical component arranged on the entire circumference of the inner surface of the cylindrical portion of the housing 3. The central axis of the lining 4 is coaxial with the rotation axis. Figure 3 as well as Figure 4 As shown, the outer peripheral surface of the lining 4 is fixed to the inner peripheral surface of the box body 3. Figure 3 As shown, the liner 4 has an axial length sufficient to include the first blade 511 and the second blade 521 described later. The liner 4 is made of a hard material such as metal. A tooth 41 is formed on the inner periphery of the liner 4.

[0099] The teeth 41 have a plurality of protrusions 411 provided along the circumference of the liner 4 and protruding inward. The protrusions 411 also extend in the axial direction of the housing 3. Each protrusion 411 has the same protruding height and has a top 412.

[0100] When the coarse fragments M2 pass between the outer peripheral portion of the rotating impeller 5 and the teeth 41 , they collide with the teeth 41 and are defibrated, thereby generating defibrated materials M3 .

[0101] The impeller 5 includes a rotation shaft 50 , a first impeller portion 51 , a second impeller portion 52 located on the right side of the first impeller portion 51 , and a partition wall 53 located between the first impeller portion 51 and the second impeller portion 52 .

[0102] The rotating shaft 50 is elongated and is disposed so as to extend in the left-right direction and penetrate the housing 3. The rotating shaft 50 is rotatably supported relative to the housing 3 via a bearing (not shown), and its right end is connected to the output shaft of the motor M. By energizing the motor M, the motor M is driven, causing the rotating shaft 50 to rotate in a predetermined direction. In addition, a speed reducer (not shown) may be provided between the output shaft of the motor M and the rotating shaft 50.

[0103] Partition walls 53 and side plates 55 are fixed to each other at a distance from each other in the longitudinal direction of the rotating shaft 50. The partition walls 53 and side plates 55 are disc-shaped and have through holes (not shown) at their centers for inserting and fixing the rotating shaft 50.

[0104] like Figures 2 to 4 As shown, the first impeller portion 51 has a plurality of first blades 511 radially arranged around the rotation axis 50, and a side plate 54 located on the left side of each first blade 511. In this embodiment, there are eight first blades 511. Each first blade 511 is plate-shaped, and its main surface is arranged along the radial direction of the casing 3 and the impeller 5. The right end surface 512 of each first blade 511 is fixed to the left surface 531 of the partition wall 53. In addition, the left end surface 513 of each first blade 511 is fixed to the right surface 541 of the side plate 54.

[0105] The second impeller portion 52 has a plurality of second blades 521 radially arranged around the rotation shaft 50, and a side plate 55 located on the right side of each second blade 521. In this embodiment, there are eight second blades 521. Each second blade 521 is plate-shaped, and each main surface thereof is arranged along the radial direction of the casing 3 and the impeller 5. The right end surface 522 of each second blade 521 is fixed to the left surface 551 of the side plate 55. In addition, the left end surface 523 of each second blade 521 is fixed to the right surface 532 of the partition wall 53. The partition wall 53, the side plate 54 and the side plate 55 are arranged at equal intervals and approximately in parallel along the axial direction of the rotation shaft 50.

[0106] In this manner, each first blade 511 is fixed to the rotating shaft 50 via the partition wall 53, and each second blade 521 is fixed to the rotating shaft 50 via the partition wall 53 and the side plate 55. Thus, as the rotating shaft 50 rotates, each first blade 511 and each second blade 521 rotates around the rotating shaft 50 together with the partition wall 53, the side plate 54, and the side plate 55. The coarse fragments M2 are defibrated as they pass between the rotating first blades 511 and the liner 4, and are further defibrated as they pass between the rotating second blades 521 and the liner 4.

[0107] The partition wall 53 is located between the first blade 511 and the second blade 521 and is fixed to both the first blade 511 and the second blade 521. The outer periphery of the partition wall 53 is separated from the liner 4 by a predetermined distance. The first blade 511 and the second blade 521 can rotate stably together with the partition wall 53 while being fixed in position to each other.

[0108] As described above, the impeller 5 includes the first impeller portion 51 and the second impeller portion 52, and these components perform defibration in two stages. This allows for smoother and more efficient defibration of the coarse fragments M2, compared to a single-stage defibration, and further improves the defibration degree.

[0109] The rotation speed of the impeller 5 during defibration is not particularly limited, but is preferably 1000 rpm or more and 300,000 rpm or less, and more preferably 2000 rpm or more and 20,000 rpm or less.

[0110] In this embodiment, the first blades 511 have the same shape and size, and the second blades 521 have the same shape and size. However, the present invention is not limited to this structure. At least one of the first blades 511 may have a different shape or size from the others, and at least one of the second blades 521 may have a different shape or size from the others.

[0111] Furthermore, the first blades 511 and the second blades 521 are arranged in the same pattern when viewed from the axial direction of the rotating shaft 50. In this embodiment, the first blades 511 and the second blades 521 have the same shape, size, number of blades, and arrangement pattern. However, this is not limiting. For example, the first blades 511 and the second blades 521 may have different sizes, different numbers of blades, or different circumferential spacing. For example, the length of the first blade 511 in the direction of the rotating shaft 50 may be shorter or longer than the length of the second blade 521 in the direction of the rotating shaft 50. Alternatively, the length of the first blade 511 in the impeller radial direction may be shorter or longer than the length of the second blade 521 in the impeller radial direction. Furthermore, even if the first blades 511 and the second blades 521 have the same number of blades, they may be arranged so that the circumferential spacing between the first blades 511 and the second blades 521 is offset by half the circumferential spacing when viewed from the axial direction of the rotating shaft 50.

[0112] The first blade 511 and the second blade 521 are made of a hard material such as metal, for example. The first blade 511 and the second blade 521 are preferably made of the same material, but are not limited thereto.

[0113] The first blades 511 and the second blades 521 are arranged in the same pattern when viewed from the axial direction of the rotating shaft 50. That is, the first blades 511 and the second blades 521 overlap when viewed from the axial direction of the rotating shaft 50. This structure allows the first blades 511 and the second blades 521 to be interchangeable, further simplifying the structure.

[0114] However, the present invention is not limited to this structure, and only a portion of the first blade 511 and the second blade 521 may overlap with the other, or the arrangement positions of both may be shifted in the circumferential direction or radial direction of the impeller 5 .

[0115] like Figure 2 as well as Figure 3 As shown, the first impeller portion 51 has a gap S1 on the outer periphery of the rotating shaft 50, that is, between the rotating shaft 50 and each first blade 511. In other words, the first blades 511 are radially arranged around the rotating shaft 50 with the gap S1 interposed therebetween.

[0116] The right side of the gap S1 is partitioned by the partition wall 53 . The outer peripheral side of the gap S1 is open to the liner 4 through the spaces between the adjacent first blades 511 . The right side of the gap S1 is open to the internal space S0 on the side of the inlet 31 through the inlet 540 .

[0117] An inlet 540 formed as a through hole is formed at the center of the side plate 54 near the rotation axis 50. The coarse fragments M2 introduced from the inlet 31 into the internal space S0 can be introduced into the gap S1 through the inlet 540.

[0118] The inlet 540 located near the rotating shaft 50 is an opening portion of the gap S1 relative to the internal space S0, and is formed at the center of the side plate 54 to which the first blade 511 is fixed. Figure 3 As shown, the inlet 540 is circular centered on the rotation shaft 50. Thus, when the side plate 54 rotates along with the rotation of the impeller 5, a stable airflow from the inlet 540 toward the gap S1 is formed, thereby smoothly forming a flow of the coarse fragments M2.

[0119] The shape of the inlet 540 is not limited to a circle; for example, it may be a regular polygon. Furthermore, when the area of ​​the side plate 54 as viewed from the axial direction of the rotating shaft 50 is represented by A0, and the opening area of ​​the inlet 540 is represented by A1, the ratio A1 / A0 is not particularly limited, but is preferably 0.05 ≤ A1 / A0 ≤ 0.7, and more preferably 0.1 ≤ A1 / A0 ≤ 0.5. By setting the ratio A1 / A0 within the above range, the flow of the coarse fragments M2 through the gap S1 can be adjusted to an appropriate flow rate, resulting in a smoother flow.

[0120] The coarse fragments M2 introduced from the introduction port 31 into the internal space S0 are arranged in a manner as follows: Figure 2 The following describes the process in detail. When the impeller 5 rotates in a predetermined direction, the air in the gap S1 passes between adjacent first blades 511 due to centrifugal force and flows outward, that is, away from the rotation axis 50. This creates a negative pressure in the gap S1, but because the right side of the gap S1 is blocked by the partition wall 53, air flows into the gap S1 from the inlet 540. As this air flows, the coarse fragments M2 are introduced from the inlet 540 into the gap S1. The coarse fragments M2 introduced from the inlet 540 are transferred to the gap S1 formed between each first blade 511 and the rotation axis 50.

[0121] The gap S1 is open to the inlet 31 and is partitioned by a partition 53. The presence of the partition 53 prevents the coarse fragments M2 within the gap S1 from directly transferring to the gap S2 between the second blades 521 and the rotating shaft 50. Therefore, the coarse fragments M2 within the gap S1 are drawn outward by the airflow generated by the centrifugal force of the rotating first blades 511, passing between adjacent first blades 511. They then undergo a first-stage defibration between the outer periphery of the first blades 511 and the liner 4. Subsequently, they transfer to the space between the outer periphery of the second blades 521 and the liner 4, undergoing a second-stage defibration, resulting in a defibrated material M3. The resulting defibrated material M3 passes between the side plate 55 and the partition plate 34, passes through the internal space S0 to the right of the second impeller 52, and is discharged from the discharge port 32.

[0122] The internal space S0 on the right side of the second impeller part 52 and the interior of the discharge port 32 are set to negative pressure by the operation of the blower 261 described above, so that the defibrated material M3 can be discharged smoothly from the discharge port 32 .

[0123] Here, in the prior art, the coarse fragments M2 are Figure 2The raw material flows along the path R' indicated by the dashed line in the middle. Specifically, in the prior art, there is no opening corresponding to the inlet 540, and the raw material is supplied from the space corresponding to the space S3 between the partition plate 33 and the partition wall 53 to the space between the member corresponding to the first blade 511 and the member corresponding to the liner 4. However, because the gap between the outer periphery of the first blade 511 and the liner 4 is set relatively narrow, the raw material may sometimes accumulate in the space corresponding to the space S3 or become locally clogged, resulting in problems such as the raw material not being smoothly transferred between the outer periphery of the first blade 511 and the liner 4.

[0124] In contrast, in the micronizing device 13, the coarse fragments M2 introduced through the inlet 31 advance along the path R described above, are transferred and defibrated, and are discharged through the outlet 32. This prevents clogging of the raw material within the device, as occurs in the prior art, and enables smooth and efficient micronizing, i.e., defibration, processing.

[0125] Furthermore, in the micronizing device 13 of this embodiment, there may be cases where not all of the coarse fragments M2 introduced from the inlet 31 follow the path R, but rather a portion of the coarse fragments M2 follow the path R' and are transferred between the outer periphery of the first blade 511 and the liner 4. This situation is also encompassed by the present invention. In this case, since the amount of coarse fragments M2 that follow the path R' is relatively small, the coarse fragments M2 do not accumulate in the space S3 and cause clogging, thereby preventing smooth transfer between the outer periphery of the first blade 511 and the liner 4.

[0126] In the micronizing device 13, assuming the total amount of coarse fragments M2 introduced from the inlet 31 is V0 [kg / min], and the amount of coarse fragments M2 that travel along the path R, i.e., the amount of coarse fragments M2 introduced from the inlet 540 and transferred between the outer periphery of the first blade 511 and the liner 4 through the gap S1, is V1 [kg / min], the ratio V1 / V0 is not particularly limited, but is preferably 0.33 ≤ V1 / V0 ≤ 1, more preferably 0.5 ≤ V1 / V0 ≤ 1, and even more preferably 0.7 ≤ V1 / V0 ≤ 1. The upper limit of V1 / V0 is an inevitable value due to device design and may be less than 1, for example, within a range of approximately 0.85 to 0.99. By maintaining the V1 / V0 ratio within this range, a smoother and more effective micronizing process can be performed.

[0127] As described above, the micronizing device 13 includes: a housing 3 having an inlet 31 and an outlet 32 ​​for coarse fragments M2 as a raw material; an impeller 5 disposed within the housing 3, including a rotation axis 50, a first impeller section 51 located on the inlet 31 side, a second impeller section 52 located on the outlet 32 ​​side, and a partition wall 53 separating the first impeller section 51 from the second impeller section 52; and a liner 4 disposed on the inner surface of the housing 3 along the outer circumference of the impeller 5. The first impeller section 51 includes a plurality of first blades 511 that are open toward the inlet 31 side and radially arranged around the rotation axis 50 with gaps S1 defined by the partition wall 53 therebetween. The second impeller section 52 includes a plurality of second blades 521 that are radially arranged around the rotation axis 50. Furthermore, while the impeller 5 is rotating, the coarse fragments M2 introduced from the inlet 31 are atomized while sequentially passing through the gap S1 and between the adjacent first blades 511, and sequentially passing between the first blade 511 and the liner 4, and between the second blade 521 and the liner 4, and are discharged from the discharge port 32. This prevents the clogging of the raw material within the device, which occurs in the conventional technology, and enables smooth and satisfactory atomization processing.

[0128] The micronizing device 13 also includes a side plate 54 that rotates along with the first impeller 51. An inlet 540 for introducing the raw material, the coarse fragments M2, into the gap S1 is formed near the rotation axis 50 of the side plate 54. The first blade 511 is fixed to the side plate 54. The rotation of the first blade 511 facilitates the generation of an airflow from the inlet 540 toward the gap S1, thereby enabling smoother and more efficient micronizing.

[0129] The outer periphery of the partition wall 53 is separated from the liner 4 and fixed to the first blade 511 and the second blade 521. Thus, the first blade 511 and the second blade 521 can stably rotate together with the partition wall 53 while their mutual positional relationship is fixed.

[0130] Furthermore, while this embodiment describes a structure in which elongated, coarse fragments M2 are used as the raw material for micronization, the present invention is not limited to this. The raw material may also be in the form of scales, cotton, granules, grains, or powder. Furthermore, while the raw material is described as fiber-containing, i.e., paper, the present invention is not limited to this and may also be fiber-free. The type of raw material in the present invention is not particularly limited; for example, it may include foods such as grains, seeds, pharmaceuticals, feed, fertilizers, industrial raw materials, and industrial products. Therefore, the present invention is an invention that finely micronizes the raw material. In the case of fiber-containing raw materials, the defibration unit defibrinates the raw material into finer fibers, while in the case of non-fibrous raw materials, the pulverization unit finely pulverizes the raw material.

[0131] Second embodiment

[0132] Figure 5 It is a longitudinal sectional view of a micronization device according to a second embodiment.

[0133] Below, in reference Figure 5 Meanwhile, a second embodiment of the miniaturization device of the present invention will be described. However, the differences from the first embodiment will be described below, and the description of the common points will be omitted.

[0134] like Figure 5 As shown, the micronizing device 13 includes a cylindrical guide member 6 that guides the coarse fragments M2 introduced from the introduction port 31 to the guide port 540 .

[0135] The guide member 6 is positioned to the left of the side panel 54, i.e., on the side of the inlet 31. The left end of the guide member 6 is fixed to the partition plate 33 and the wall of the housing 3. The right end of the guide member 6 is positioned at the edge of the inlet 540 of the side panel 54, with a slight gap therebetween. The rotating shaft 50 communicates with the interior of the guide member 6.

[0136] As indicated by the path R, the coarse fragments M2 introduced from the inlet 31 pass through the guide member 6 and are introduced into the gap S1 via the inlet 540. In the structure of this embodiment, the provision of the guide member 6 significantly reduces the amount of coarse fragments M2 that enter the space S3. In other words, the aforementioned ratio V1 / V0 can be further improved. This ensures a reliable flow of coarse fragments M2 as indicated by the path R, further significantly enhancing the aforementioned effects of the present invention.

[0137] Thus, the micronizing device 13 includes the cylindrical guide member 6 that guides the coarse fragments M2 introduced from the inlet 31 to the inlet 540. This allows the coarse fragments M2 to be more reliably guided from the inlet 540 to the gap S1, thereby enabling smoother and more efficient micronizing.

[0138] In addition, although not shown, the side plate 54 can be rotatably connected to the right end of the guide member 6 via various supports such as bearings. In addition, an elastic member such as a squeegee can be provided between the side plate 54 and the guide member 6 to fill the gap.

[0139] Third embodiment

[0140] Figure 6 It is a cross-sectional view of a miniaturization device according to a third embodiment.

[0141] Below, in reference Figure 6 Meanwhile, a third embodiment of the miniaturization device of the present invention will be described. However, the differences from the first embodiment will be described below, and the description of the common points will be omitted.

[0142] like Figure 6 As shown, the micronizing device 13 includes a support member 7 that secures the side plate 54 to the rotating shaft 50. The support member 7 is rod-shaped, with one end secured to the outer periphery of the rotating shaft 50 and the other end secured to the edge of the inlet 540 of the side plate 54. In this embodiment, three support members 7 are provided, radially spaced at equal angular intervals. However, the number and arrangement of the support members 7 are not particularly limited, and support members having shapes different from those shown in the figure may also be used.

[0143] According to this embodiment, the mechanical strength of the impeller 5 can be increased by an amount corresponding to the side plate 54 being supported by the support member 7 , and the rotation of the first impeller portion 51 and the first blades 511 belonging thereto can be stabilized.

[0144] Therefore, the impeller 5 can be rotated at a relatively high speed, thereby generating a stronger airflow, thereby improving the efficiency of the defibration process. In addition, since the rotation of the impeller 5 can be made more stable, a smoother and better micronization process can be implemented.

[0145] In the third embodiment, the above-mentioned ratio A1 / A0 and the ratio V1 / V0 are also set in the same manner.

[0146] Thus, the side plate 54 is fixed to the rotating shaft 50 via the support member 7. This can further stabilize the rotation of the impeller 5, improve the efficiency of the micronization process due to the high-speed rotation of the impeller, and contribute to a smoother and better micronization process.

[0147] While the present invention's micronization device has been described above with reference to the illustrated embodiments, the present invention is not limited to the aforementioned descriptions. The components comprising the micronization device can be replaced with any other configuration that provides the same functionality. Furthermore, any other configurations can be added to the micronization device. Furthermore, the present invention's micronization device can combine features from various embodiments.

[0148] Furthermore, the sheet manufacturing apparatus may omit the raw material supply unit 11 and the crushing unit 12 . In this case, the sheet manufacturing apparatus includes a coarse fragment supply unit for supplying coarse fragments instead of the raw material supply unit 11 and the crushing unit 12 .

[0149] Explanation of symbols

[0150] 3…housing; 4…lining; 5…impeller; 6…guide member; 7…support member; 11…raw material supply unit; 12…coarse crushing unit; 13…micronizing device; 14…screening unit; 15…first tablet forming unit; 16…finely dividing unit; 17…mixing unit; 18…dispersing unit; 19…second tablet forming unit; 20…forming unit; 21…cutting unit; 22…material preparation unit; 27…recovery unit; 28…control device; 31…inlet; 32…discharge outlet; 33…partition plate; 34…partition plate; 41…teeth; 50…rotating shaft; 51…first impeller unit; 52…second impeller 53…partition wall; 54…side plate; 55…side plate; 100…sheet manufacturing device; 121…crushing blade; 122…chute; 141…roller; 142…housing; 151…mesh belt; 152…support roller; 153…suction unit; 161…rotating blade; 162…housing; 170…housing; 171…additive supply unit; 172…pipe; 173…blower; 174…screw feeder; 181…roller; 182…housing; 191…mesh belt; 192…support roller; 193…suction unit; 201…pressing unit; 202…heating 203…calender roller; 204…heating roller; 211…first shear; 212…second shear; 231…humidifying unit; 232…humidifying unit; 233…humidifying unit; 234…humidifying unit; 235…humidifying unit; 236…humidifying unit; 241…tube; 242…tube; 243…tube; 244…tube; 245…tube; 246…tube; 261…blower; 262…blower; 263…blower; 281…control unit; 282…storage unit; 283…communication unit; 411…protrusion; 412…top; 511…first blade; 51 2…end face; 513…end face; 521…second blade; 522…end face; 523…end face; 531…surface; 532…surface; 540…inlet; 541…surface; 551…surface; M…motor; M1…raw material; M2…coarse fragments; M3…defibrated material; M4-1…first screened material; M4-2…second screened material; M5…first material sheet; M6…finely divided material; M7…mixture; M8…second material sheet; P1…binder; R…path; R'…path; S…recycled paper; S0…internal space; S1…gap portion; S2…gap portion; S3…space.

Claims

1. A miniaturization device, characterized in that: have: A box body having a raw material input port and a discharge port; an impeller having a rotation shaft, a first impeller portion located on the inlet side, a second impeller portion located on the outlet side, and a partition wall separating the first impeller portion from the second impeller portion, and arranged inside the casing; a lining arranged on the inner surface of the casing along the outer periphery of the impeller, The first impeller unit includes a plurality of first blades, which are open toward the inlet and are radially arranged around the rotation axis via gaps partitioned by the partition wall. The second impeller portion includes a plurality of second blades, and the plurality of second blades are radially arranged around the rotation axis. While the impeller is rotating, the raw material fed from the inlet is atomized while passing through the gap and between the adjacent first blades, between the first blades and the liner, and between the second blades and the liner, and is discharged from the discharge port.

2. The miniaturization device according to claim 1, wherein: A side plate is provided, the side plate rotating together with the first impeller portion, an inlet for introducing the raw material into the gap portion is formed near the rotation axis of the side plate, and the first blade is fixed to the side plate.

3. The miniaturization device according to claim 2, wherein: A cylindrical guide member is provided for guiding the raw material fed from the feed port toward the introduction port.

4. The miniaturization device according to claim 2 or 3, wherein: The side plate is fixed to the rotating shaft via a support member.

5. The miniaturization device according to claim 1 or 2, wherein: The outer peripheral portion of the partition wall is separated from the liner and is fixed to the first blade and the second blade.

6. The miniaturization device according to claim 1 or 2, wherein: The first blades and the second blades are arranged in the same pattern when viewed in the axial direction of the rotating shaft.

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