JP2020036151A - Diaphragm for speaker, diaphragm for speaker manufacturing device, and method for manufacturing diaphragm form speaker - Google Patents

Abstract

To prevent, in manufacturing a diaphragm for a speaker, the imbalance between and aggregation of a fiber and the other material in mixing the fiber and the other material.SOLUTION: A diaphragm manufacturing device 100 comprises: a fibrillation unit 20 that fibrillates a material MA including a fiber; a mixing unit 50 that mixes a binding material for binding fibers in a fibrillated material MB fibrillated by the fibrillation unit 20; a second web forming unit 70 that deposits the mixture MX mixed by the mixing unit 50; and a molding unit 200 that forms a second web W2 deposited by the second web forming unit 70 into a diaphragm CP through molding processing including application of pressure and heat.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a speaker diaphragm, a speaker diaphragm manufacturing apparatus, and a speaker diaphragm manufacturing method.

  2. Description of the Related Art Conventionally, as a method of manufacturing a diaphragm used for a speaker or the like, there is known a method of mixing pulp by wet papermaking with a material such as resin to form paper (for example, see Patent Document 1). In the method of Patent Literature 1, a synthetic fiber of polyethylene is added to pulp to form a paper, and molding is performed by heating and pressing which also serves as drying.

JP-A-55-136792

Wet papermaking is a molding method using hydrogen bonding between fibers, and has a problem that it is difficult to secure a large inter-fiber distance by using water, since hydrogen bonding between fibers works strongly. A diaphragm for a speaker is required to have uniformity in order to obtain good sound quality. The characteristics of a diaphragm for a speaker are required to have low density, high rigidity, and high internal loss in order to obtain good sound quality.
However, a speaker diaphragm manufactured by wet papermaking has a high fiber density after molding, and it is difficult to manufacture a low-density molded body or a molded body with high internal loss. In addition, wet papermaking uses a large amount of water, and therefore requires equipment for water supply and drainage.
And, in wet papermaking, in order to disperse a plurality of materials in water, due to the difference in shape, specific gravity, hydrophilicity / hydrophobicity, solubility, dispersibility of each material, the fibers may be biased or aggregated, Orientation is provided. For this reason, there is a possibility that unevenness of components and unevenness of thickness may occur in the process of wet papermaking, and there is a problem that homogeneity is impaired.

An object of the present invention is to produce a speaker diaphragm by dry papermaking to obtain characteristics such as low density, high rigidity, and high internal loss, which are optimal as a speaker diaphragm.
Another object of the present invention is to suppress the deviation and aggregation of fibers and other materials when fibers are mixed with other materials when manufacturing a speaker diaphragm.

  One mode for achieving the above object is to include a defibrated material obtained by defibrating a material containing fibers and a binding material for binding the fibers, and a speaker vibration formed by a molding process including pressurization and heating. It is a board.

  In the speaker diaphragm, the bonding material may include at least one of a thermoplastic resin and a thermosetting resin.

  The speaker diaphragm may include a thermally expandable material.

  The speaker diaphragm may have a vibrating surface, and a sub-material may be attached to at least one of the vibrating surfaces.

  One mode for achieving the above object is a defibrating unit for defibrating a material containing fibers, and a mixing unit for mixing a binding material for binding the fibers to the defibrated material defibrated in the defibrating unit. And a forming unit configured to deposit the mixture mixed in the mixing unit, and a forming unit configured to form the deposited material formed in the stacking unit on the speaker diaphragm by a forming process including pressing and heating. This is a diaphragm manufacturing apparatus.

  In the above-mentioned speaker diaphragm manufacturing apparatus, the mixing unit may disperse the mixture, and the deposition unit may deposit the mixture.

  In the above-mentioned speaker diaphragm manufacturing apparatus, the mixing section may be configured to mix the defibrated material and the binding material with a thermally expandable material that expands when heated.

  In the apparatus for manufacturing a diaphragm for a speaker, the mixing section may be configured to mix the defibrated material and the binding material containing at least one of a thermoplastic resin and a thermosetting resin.

  In the above speaker diaphragm manufacturing apparatus, the deposition unit deposits the mixture to form a web, and the molding unit presses and heats the web set in a molding die in the molding process. It may be.

  In the speaker diaphragm manufacturing apparatus, the stacking unit includes a sheet forming unit that forms a sheet by depositing the mixture to form a web, and presses and heats the web to form a sheet. In the forming process, the sheet set in the forming die may be pressurized and heated.

  In the above speaker diaphragm manufacturing apparatus, the deposition unit deposits the mixture on a molding die, and the molding unit presses and heats the molding die on which the mixture is deposited in the molding process. You may.

  In the above-described speaker diaphragm manufacturing apparatus, the speaker diaphragm manufacturing apparatus may include an adhesion processing unit that adheres a sub-material to a surface of the speaker diaphragm formed by the molding unit.

  One mode for achieving the above object is to defibrate a material containing fibers, mix the defibrated defibrated material with a binding material that binds the fibers, deposit the mixture, and apply pressure and heating. This is a method for manufacturing a speaker diaphragm, wherein a deposit is formed on the speaker diaphragm by a molding process including the same.

FIG. 3 is a perspective view of a diaphragm manufactured by the method for manufacturing a diaphragm according to the first embodiment. 5 is a flowchart illustrating a method for manufacturing the diaphragm according to the first embodiment. FIG. 1 is a configuration diagram of a diaphragm manufacturing apparatus according to a first embodiment. Explanatory drawing which shows the state of bridge | crosslinking by addition material. Explanatory drawing which shows the state of bridge | crosslinking at the time of using a thermal expansion material. Explanatory drawing which shows the state of bridge | crosslinking at the time of using a core sheath structure fiber. 9 is a flowchart illustrating a method for manufacturing a diaphragm according to a second embodiment. The block diagram of the diaphragm manufacturing apparatus of 2nd Embodiment. 9 is a flowchart illustrating a method for manufacturing a diaphragm according to a third embodiment. The block diagram of the diaphragm manufacturing apparatus of 3rd Embodiment. 9 is a flowchart illustrating a method for manufacturing a diaphragm according to a fourth embodiment. The block diagram of the diaphragm manufacturing apparatus of 4th Embodiment. Explanatory drawing which shows the specific example of a sub material addition process. Explanatory drawing which shows the specific example of a sub material addition process. Explanatory drawing which shows the specific example of a sub material addition process. Explanatory drawing which shows the specific example of a sub material addition process. Explanatory drawing which shows the specific example of a sub material addition process. Explanatory drawing which shows the specific example of a sub material addition process. Explanatory drawing which shows the specific example of a sub material addition process.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. The embodiments described below do not limit the content of the present invention described in the claims. In addition, all of the configurations described below are not necessarily essential components of the invention.

[1. First Embodiment]
[1-1. Manufacturing process of speaker diaphragm]
FIG. 1 is a perspective view showing a configuration of a diaphragm CP manufactured by the manufacturing method of the present embodiment.
The diaphragm CP is a speaker diaphragm used for a speaker that outputs sound, and has a truncated cone shape. The diaphragm CP is processed to attach an edge, a center cap, a lead wire, a voice coil, and the like to form a speaker. In the following description, the diaphragm CP is described as having a simple truncated cone shape, but the diaphragm CP may be provided with concentric ribs. Further, a shape for attaching an edge or a shape for attaching a lead wire or a center cap may be provided on the outer peripheral portion of the diaphragm CP.

  Diaphragm CP is formed by pressing and heating a material containing fibers as described later. Diaphragm CP has a concave surface on the sound output side. In the diaphragm CP, a surface on which sound is output is referred to as a front surface 1002, and a bottom surface of a concave portion of the surface 1002 is referred to as a bottom portion 1003. Further, the back surface of the front surface 1002 is referred to as a back surface 1004. The front surface 1002 is a surface on the side that outputs vibration of the diaphragm CP1 as sound, and thus can also be referred to as a vibration surface.

  FIG. 2 is a flowchart illustrating a method of manufacturing the diaphragm according to the first embodiment, and illustrates a process of manufacturing a speaker diaphragm CP using a raw material including fibers. The diaphragm CP is known as a so-called cone paper or a speaker cone.

The manufacturing process shown in FIG. 2 uses a raw material MA containing fibers. The raw material MA may be one containing fibers. For example, wood-based pulp materials, kraft pulp, waste paper, synthetic pulp, and the like can be used. Wood-based pulp materials include mechanical pulp (mechanical pulp) made by mechanical treatment such as ground pulp, chemical pulp (chemical pulp) made by chemical treatment, and semi-chemical pulp and chemical pulp produced by combining these two treatments. Ground pulp and the like. In addition, either bleached pulp or unbleached pulp may be used. For example, virgin pulp such as N-BKP (softwood bleached kraft pulp) and L-BKP (hardwood bleached kraft pulp), bleached chemi-thermomechanical pulp (BCTMP: Bleached ChemiThermal Mechanical Pulp) and the like can be mentioned. Further, a nanocellulose fiber (NCF) may be used. Recovered paper is used after printing such as PPC (Plain Paper Copy) paper, magazines, and newspapers. Examples of the synthetic pulp include SWP manufactured by Mitsui Chemicals, Inc. SWP is a registered trademark.
The raw material MA, the defibrated material MB, and the material MC described below can be said to be a material containing fibers.

  In addition, the raw material MA may include carbon fiber, metal fiber, and thixotropic fiber in addition to the woody pulp material, waste paper, synthetic pulp, or the like, or as an alternative thereto. Therefore, the raw material MA may be a mixture obtained by mixing a plurality of materials among the above-mentioned woody pulp material, waste paper, synthetic pulp, carbon fiber, metal fiber, and thixotropic fiber.

  Step SA1 is a crushing step of crushing the raw material MA. The crushing step is a step of cutting the raw material MA into a predetermined size or less. The predetermined size is, for example, 1 cm to 5 cm square. The cut raw material MA is referred to as coarsely crushed pieces. When the raw material MA is composed of the fibers or the fiber pieces having the predetermined size or less, the crushing step of Step SA1 may be omitted.

Step SA2 is a defibration step. The defibration step is a step of defibrating the raw material MA or the crushed pieces crushed in step SA1 in the air to loosen the fibers contained in the raw material MA into one or a small number of fibers. The raw material MA and the crushed pieces can also be referred to as defibrated materials. Moreover, what was defibrated in the defibration step is referred to as defibrated material MB. By defibrating the raw material MA in the defibration step, an effect of separating substances such as resin particles, ink, toner, and a bleeding inhibitor attached to the raw material MA from fibers can be expected. The defibrated material MB is, in addition to the defibrated defibrated fibers, resin particles separated from the fibers when the fibers are defibrated, a coloring agent such as ink and toner, a bleeding prevention material, a paper strength enhancer, May be included.
In the defibration process, defibration is performed by a dry method. The dry method refers to performing a process such as defibration in the air or in a controlled gas, not in a liquid.
Further, in the processing described below, the processing executed in the atmosphere is not limited to the processing executed in the air. For example, it can be performed in a gas other than air. That is, “in the air” described below can be rephrased as “in the air”.

The defibrated material MB may include fibers of different lengths. The length of the fibers contained in the defibrated material MB, that is, the fiber length is preferably 1 μm (1.0 × 10 ⁻⁶ m) or more and 500 mm or less, more preferably 5 μm or more and 200 mm or less. Further, the thickness of the fiber, that is, the fiber diameter is preferably 0.1 μm or more and 1000 μm or less, more preferably 1 μm or more and 500 μm or less.

  Step SA3 is a step of extracting a material mainly composed of fibers from the defibrated material MB, and is referred to as a separation step. The separation step is a step of separating particles, such as resin and additives, from the defibrated material MB containing fibers, resin particles, and the like, and extracting a material mainly composed of fibers. Thereby, among the components contained in the raw material MA, particles of the resin and the additive that affect the production of the diaphragm CP can be removed. The material separated in the separation step is referred to as a material MC.

  If the raw material MA supplied in step SA1 does not contain particles or the like that affect the production of the diaphragm CP, or if it is not necessary to remove particles or the like from the components contained in the raw material MA, the separation step in step SA3 is performed. Can be omitted. In this case, the defibrated material MB is directly used as the material MC.

  Step SA4 is an addition step. The addition step is a step of adding an additional material AD to the material MC separated in step SA3.

The additive material AD includes particles of a resin that functions as a bonding material for bonding the fibers, and specifically includes particles of a thermoplastic resin and / or particles of a thermosetting resin.
As the thermoplastic resin, for example, a resin having a melting temperature of 60 ° C to 200 ° C and a deformation temperature of 50 ° C to 180 ° C can be used. Here, the deformation temperature can also be referred to as a glass transition point temperature. Petroleum-derived resins, biomass plastics, and biodegradable plastics can be used as the thermoplastic resin. Here, as the petroleum-derived resin, for example, polyolefin resin, polyester resin, polyamide resin, polyacetal, polycarbonate, modified polyphenylene ether, cyclic polyolefin, ABS resin, polystyrene, polyvinyl chloride, polyvinyl acetate, polyurethane, Teflon Resin, acrylic resin, polyphenylene sulfide, polytetrafluoroethylene, polysulfone, polyethersulfone, amorphous polyaryate, liquid crystal polymer, polyetheretherketone, thermoplastic polyimide, polyamideimide. Examples of biomass plastics and biodegradable plastics include polylactic acid, polycaprolactone, modified starch, polyhydroxybutyrate, polybutylene succinate, polybutylene succinate, polybutylene succinate adipate, and the like. Teflon is a registered trademark. Examples of the thermosetting resin include a phenol resin, an epoxy resin, a vinyl ester resin, and an unsaturated polyester. The additive material AD contains one or more of the above resins. The additive material AD is preferably in the form of particles, more preferably particles having a weight average particle size of 0.1 μm or more and 120 μm or less, and further preferably particles having a weight average particle size of 1 μm or more and 50 μm or less. The resin particles include, for example, an aggregation inhibitor made of silica (silicon oxide) or the like, which is included by kneading, or is applied to the outer surfaces of the resin particles and added thereto (to the outer surface). Particles (which are attached) can be used.

  The additive material AD may include, in addition to the resin described above, a thermally expandable material that expands when heated. As the heat-expandable material, a so-called foam material can be used. The heat-expandable material is preferably in the form of particles, and the heat-expandable material formed into particles can be called expanded particles. The particle diameter of the expanded particles contained in the additive material AD is preferably 0.5 μm or more and 1000 μm or less, more preferably 1 μm or more and 300 μm or less in terms of weight average particle diameter before expansion. More preferably, the weight average particle size after foaming is 5 μm or more and 1000 μm or less, and most preferably 5 μm or more and 800 μm or less.

  As the expanded particles, for example, a thermally expandable capsule in the form of a capsule that expands by heat, or expanded material mixed particles in which a thermally expandable material is mixed can be used. Examples of the thermal expansion capsule include Advancel manufactured by Sekisui Chemical Co., Ltd., Kureha Sphere manufactured by Kureha Co., Ltd., Expancel manufactured by Akzo Nobel Co., Ltd., and Matsumoto Microsphere manufactured by Matsumoto Yushi Seiyaku Co., Ltd. . Advancel, Kureha, Expancel, Expancel, and Matsumoto Microsphere are each registered trademarks. The foam-mixed particles are a particulate preparation manufactured by mixing a thermally expandable material with the thermoplastic resin described above. Here, the foaming material is, for example, azodicarbonamide, N, N'-dinitrosopentamethylenetetramine, 4,4'-oxybis (benzenesulfonylhydrazide, N, N'-dinitrosopentamethylenetetramine, azodicarbonamide, Sodium bicarbonate or the like can be used.

  When the structure is such that the surface of the foamed particles is covered with a resin, the coverage of the foamed particles with the resin is preferably 10% or more and 100% or less.

  The additive material AD may include an inorganic filler, a rigid fiber, and a thixotropic fiber, in addition to the resin described above, as a reinforcing material that makes the crosslinked structure in which the fibers are bonded more rigid. As the inorganic filler, for example, calcium carbonate, mica and the like can be used. As the rigid fiber, for example, carbon fiber or metal fiber can be used. Thixotropic fibers include cellulose nanofibers.

  Further, the additive material AD may be formed as a composite resin material powder by kneading and pulverizing components such as the above-described resin, expanded particles, and reinforcing material.

  Step SA5 is a mixing step. In the mixing step, the material MC and the additive material AD are mixed to produce a mixture MX.

  Step SA6 is a sieving step. In the sieving step, the mixture MX is sieved, dispersed in the atmosphere, and lowered.

  Step SA7 is a deposition step. In the deposition step, the mixture MX falling in the sieve step of step SA6 is deposited to form a web. The web formed in step SA7 is called a second web W2. The second web W2 is in a state where the fibers included in the mixture MX and the additive material AD are deposited, has a predetermined thickness, and has low rigidity. The second web W2 corresponds to a deposit and a web.

  Step SA8 is a pressure heating step of pressing and heating the second web W2. In the pressure heating step, the sheet S is formed by applying pressure and heat to the second web W2. The order of pressurization and heating in the pressurizing and heating step is not limited, but it is preferable that pressurization is performed first.

  Step SA9 is a transporting step of transporting the sheet S formed in the pressurizing and heating step to a molding die. The conveying step may include a step of cutting the sheet S formed in the pressurizing and heating step according to the size of the mold.

  Step SA10 is a forming step of forming the diaphragm CP by pressing and heating the sheet S with a forming die.

[1-2. Configuration of diaphragm manufacturing equipment]
FIG. 2 is a configuration diagram of the diaphragm manufacturing apparatus 100.
The diaphragm manufacturing apparatus 100 executes the manufacturing process of the diaphragm CP shown in FIG. 2 to manufacture the diaphragm CP from the raw material MA. The diaphragm manufacturing apparatus 100 corresponds to a speaker diaphragm manufacturing apparatus.

  The diaphragm manufacturing apparatus 100 includes a defibrating unit 20, an additive supply unit 52, a mixing unit 50, a second web forming unit 70, and a forming unit 200 as essential components. The second web forming unit 70 corresponds to a deposition unit. Further, the diaphragm manufacturing apparatus 100 includes a supply unit 10, a crushing unit 12, a sorting unit 40, a first web forming unit 45, a rotating body 49, a mixing unit 50, a dispersing unit 60, a web transport unit 79, a pressurizing and heating unit. 80, a cutting section 90, and a transport section 95.

  The crushing unit 12, the defibrating unit 20, the sorting unit 40, and the first web forming unit 45 constitute a defibrating unit 101 that processes the raw material MA to produce the material MC. The rotating body 49, the mixing unit 50, the dispersion unit 60, the second web forming unit 70, the pressurizing and heating unit 80, and the cutting unit 90 constitute a manufacturing unit 102 that manufactures the sheet S from the material MC.

The supply unit 10 is an automatic charging device that stores the raw material MA and continuously inputs the raw material MA to the crushing unit 12.
The crushing unit 12 performs a crushing step (step SA1). The crushing unit 12 includes a crushing blade 14, and the raw material MA is cut in the atmosphere by the crushing blade 14 to form a crushed piece of several cm square. The shape and size of the strip are arbitrary. For the crushing unit 12, for example, a shredder can be used. The raw material MA cut in the crushing unit 12 is collected by the hopper 9 and transported to the defibrating unit 20 through the pipe 2.

  The defibrating unit 20 is a device for defibrating the crushed pieces cut by the crushing unit 12 in a dry manner, and executes a defibration step (step SA2). The defibrating unit 20 can be constituted by a defibrating machine such as an impeller mill, for example. The defibrating unit 20 of the present embodiment includes a cylindrical stator 22 and a rotor 24 that rotates inside the stator 22, and defibrating blades are provided on the inner peripheral surface of the stator 22 and the outer peripheral surface of the rotor 24. The formed mill. Due to the rotation of the rotor 24, the coarsely crushed pieces are sandwiched between the stator 22 and the rotor 24 to be defibrated. The defibrated material MB defibrated by the defibrating unit 20 is sent to the pipe 3 from the outlet of the defibrating unit 20.

  The crushed pieces are conveyed from the crushing unit 12 to the defibrating unit 20 by airflow. The defibrated material MB is transferred from the defibrating unit 20 to the sorting unit 40 via the pipe 3 by an air current. These airflows may be generated by the defibrating unit 20 or a blower (not shown) may be provided to generate the airflows.

  The sorting unit 40 sorts the components contained in the defibrated material MB according to the fiber size. The fiber size mainly refers to the length of the fiber.

  The sorting unit 40 of the present embodiment has a drum unit 41 and a housing unit 43 that houses the drum unit 41. The drum unit 41 is a so-called sieve such as a net having openings, a filter, and a screen. Specifically, the drum portion 41 has a cylindrical shape driven to rotate by a motor, and at least a part of the peripheral surface is a net. The drum portion 41 may be formed of a metal mesh, an expanded metal obtained by extending a cut metal plate, a punching metal, or the like. The defibrated material MB introduced into the inside of the drum portion 41 from the introduction port 42 is separated into a passing material that passes through the opening of the drum portion 41 and a residue that does not pass through the opening by rotation of the drum portion 41. The passing material that has passed through the opening contains fibers or particles smaller than the opening, and this is used as the first sorted product. The residue contains fibers larger than the opening, unfibrillated fragments and lumps, and is referred to as a second sort. The first sorting object descends inside the housing part 43 toward the first web forming part 45. The second sorted product is conveyed to the defibrating unit 20 via the pipe 8 from the outlet 44 communicating with the inside of the drum unit 41.

  The diaphragm manufacturing apparatus 100 may include a classifier that separates the first sorted material and the second sorted material, instead of the sorting unit 40. The classifier is, for example, a cyclone classifier, an elbow jet classifier, or an eddy classifier.

  The first web forming unit 45 includes a mesh belt 46, a stretching roller 47, and a suction unit 48. The mesh belt 46 is an endless metal belt, and is stretched over a plurality of tension rollers 47. The mesh belt 46 orbits a track formed by the tension rollers 47. Part of the track of the mesh belt 46 is flat below the drum portion 41, and the mesh belt 46 forms a flat surface.

  A large number of openings are formed in the mesh belt 46, and components of the first sorted material descending from the drum portion 41, which are larger than the openings of the mesh belt 46, accumulate on the mesh belt 46. Components of the first sorted product smaller than the openings of the mesh belt 46 pass through the openings. The component passing through the opening of the mesh belt 46 is referred to as a third sorted product, and is, for example, a fiber shorter than the opening of the mesh belt 46, resin particles separated from the fiber by the defibrating unit 20, ink, toner, a bleeding inhibitor, or the like. Including particles containing

The suction unit 48 is connected to a blower (not shown), and sucks air from below the mesh belt 46 by the suction force of the blower. The air sucked from the suction unit 48 is discharged together with the third sorted product that has passed through the opening of the mesh belt 46.
The airflow sucked by the suction unit 48 attracts the first sorted material descending from the drum unit 41 to the mesh belt 46, and thus has an effect of promoting the accumulation.

  The components deposited on the mesh belt 46 have a web shape and constitute the first web W1. That is, the first web forming unit 45 forms the first web W1 from the first sorted product sorted by the sorting unit 40.

  The first web W1 is mainly composed of fibers larger than the openings of the mesh belt 46 among the components contained in the first sorted product, and is formed in a soft and swollen state with a large amount of air. The first web W1 is transported to the rotating body 49 as the mesh belt 46 moves.

  The rotating body 49 includes a plurality of plate-like blades, and is driven by a driving unit (not shown) such as a motor to rotate. The rotator 49 is disposed at an end of the track of the mesh belt 46 and comes into contact with a portion of the first web W1 carried by the mesh belt 46 projecting from the mesh belt 46. The first web W1 is disentangled by the rotator 49 that collides with the first web W1, becomes a small fiber mass, and is conveyed to the mixing unit 50 through the pipe 7. The material obtained by dividing the first web W1 by the rotating body 49 is referred to as a material MC. The material MC is obtained by removing the third sorted material from the first sorted material described above, and the main component is a fiber.

  As described above, the sorting unit 40 and the first web forming unit 45 have a function of separating the fiber-containing material MC from the defibrated material MB, and execute the separation step (step SA3).

The additive supply unit 52 is a device that adds the additive material AD to the pipe 54 that transports the material MC, and executes an addition step (step SA4).
An additive cartridge 52a that stores the additive material AD is set in the additive supply unit 52. The additive cartridge 52a is a tank that stores the additive material AD, and may be detachable from the additive supply unit 52. The additive supply unit 52 includes an additive removal unit 52b that removes the additive material AD from the additive cartridge 52a, and an additive input unit 52c that discharges the additive material AD extracted by the additive removal unit 52b to a pipe 54. . The additive removing unit 52b includes a feeder that sends the additive material AD to the additive charging unit 52c. The additive introduction part 52c has a shutter that can be opened and closed, and sends out the additive material AD to the pipe 54 by opening the shutter.

  The mixing section 50 mixes the material MC and the additive material AD with the mixing blower 56. The mixing section 50 may include a pipe 54 that conveys the material MC and the additive material AD to the mixing blower 56. The mixing unit 50 performs a mixing process (Step SA5).

  The mixing blower 56 generates an airflow in the pipe 54 connecting the pipe 7 and the dispersion unit 60, and mixes the material MC and the additive material AD. The mixing blower 56 includes, for example, a motor, blades driven and rotated by the motor, and a case for housing the blades. In addition, the mixing blower 56 may include a mixer that mixes the material MC and the additive material AD, in addition to the blade that generates the airflow. The mixture mixed in the mixing section 50 is hereinafter referred to as a mixture MX. The mixture MX is conveyed to the dispersion unit 60 by the airflow generated by the mixing blower 56, and is introduced into the dispersion unit 60.

  The dispersing section 60 loosens the fibers of the mixture MX and lowers the fibers in the second web forming section 70 while dispersing the fibers in the air. When the additive material AD is fibrous, these fibers are also loosened in the dispersion unit 60 and descend to the second web forming unit 70. The dispersion unit 60 executes a sieving process (step SA6).

  The dispersion unit 60 has a dispersion drum 61 and a housing 63 that houses the dispersion drum 61. The dispersion drum 61 is, for example, a cylindrical structure configured similarly to the drum unit 41, and rotates by the power of a motor (not shown) to function as a sieve similarly to the drum unit 41. The dispersion drum 61 has an opening, and lowers the mixture MX loosened by the rotation of the dispersion drum 61 from the opening. Thereby, the mixture MX descends from the dispersion drum 61 in the internal space 62 formed inside the housing 63. The housing 63 corresponds to a case.

  Below the dispersion drum 61, a second web forming unit 70 is disposed. The second web forming unit 70 includes a mesh belt 72, a stretching roller 74, and a suction mechanism 76.

  The mesh belt 72 is formed of an endless metal belt similar to the mesh belt 46, and is stretched over a plurality of tension rollers 74. The mesh belt 72 moves in the transport direction indicated by reference F <b> 1 while orbiting the track formed by the tension rollers 74. Part of the track of the mesh belt 72 is flat below the dispersion drum 61, and the mesh belt 72 forms a flat surface.

A large number of openings are formed in the mesh belt 72, and components of the mixture MX falling from the dispersion drum 61, components larger than the openings of the mesh belt 72, accumulate on the mesh belt 72. In addition, components of the mixture MX that are smaller than the openings of the mesh belt 72 pass through the openings.
The second web forming unit 70 corresponds to a stacking unit, and the second web forming unit 70 executes a stacking step (step SA7).

  The suction mechanism 76 sucks air from the side opposite to the dispersion drum 61 with respect to the mesh belt 72 by the suction force of a blower (not shown). The component that has passed through the opening of the mesh belt 72 is sucked by the suction mechanism 76. The airflow sucked by the suction mechanism 76 attracts the mixture MX descending from the dispersion drum 61 to the mesh belt 72 to promote the accumulation. In addition, the airflow of the suction mechanism 76 forms a downflow in the path where the mixture MX falls from the dispersion drum 61, and an effect of preventing fibers from becoming entangled during falling can be expected.

Since the end of the diaphragm CP on the side of the bottom 1003 is a joint with the voice coil bobbin of the speaker, it is important to ensure uniformity and strength. May be set large. In this case, the suction force is locally distributed in the suction mechanism 76, and the suction force in the region corresponding to the bottom 1003 of the second web W2 is selectively increased to adjust the basis weight (fiber thickness). It is also possible. For example, the wind speed and air volume of the airflow sucked by the suction mechanism 76 through the mesh belt 72, or the suction force due thereto, may be distributed so as to cause a difference in the plane of the mesh belt 72.
The components deposited on the mesh belt 72 have a web shape, and constitute the second web W2. The second web W2 corresponds to a web and a deposit.

  In the transport path of the mesh belt 72, a humidity control unit 78 is provided downstream of the dispersion unit 60. The humidity control unit 78 is a mist humidifier that supplies water to the mesh belt 72 in the form of a mist, and includes, for example, a tank that stores water and an ultrasonic vibrator that converts the water into a mist. The mist supplied by the humidity control unit 78 adjusts the water content of the second web W2, and suppresses the adsorption of fibers to the mesh belt 72 due to static electricity.

  The second web W2 is peeled off from the mesh belt 72 by the web transport unit 79 and is transported to the pressurizing and heating unit 80. The web transport unit 79 has a mesh belt 79a, a roller 79b, and a suction mechanism 79c. The suction mechanism 79c includes a blower (not shown), and generates an upward airflow through the mesh belt 79a by the suction force of the blower. The mesh belt 79a, like the mesh belt 46 and the mesh belt 72, can be constituted by an endless metal belt having an opening. The mesh belt 79a is moved by the rotation of the roller 79b, and moves on an orbit. In the web transport unit 79, the second web W2 separates from the mesh belt 72 and is attracted to the mesh belt 79a by the suction force of the suction mechanism 79c. The second web W2 moves together with the mesh belt 79a and is conveyed to the pressurizing and heating unit 80.

  The pressing and heating unit 80 includes a pressing unit 82 and a heating unit 84. The pressing unit 82 presses the second web W2 with a predetermined nip pressure, adjusts the thickness of the second web W2, and densifies the second web W2. The heating unit 84 applies heat to the second web W2 to bind the fibers derived from the material MC included in the second web W2 with the resin included in the additive material AD. The pressing unit 82 includes a pair of calender rollers 85. The pressurizing unit 82 includes a press mechanism that applies nip pressure to the calendar rollers 85, 85 by hydraulic pressure, and a motor that rotates the calendar rollers 85, 85. The heating unit 84 includes a pair of heating rollers 86, 86. The heating unit 84 includes a heater (not shown) that heats the peripheral surface of the heating roller 86 to a predetermined temperature, and a motor (not shown) that rotates the heating rollers 86 and 86 toward the cutting unit 90. The second web W2 is heated to a temperature higher than the glass transition point of the resin contained in the mixture MX in the heating unit 84, and becomes a sheet S. The pressurizing and heating unit 80 corresponds to a sheet forming unit.

  The cutting unit 90 cuts the sheet S formed by the pressurizing and heating unit 80. The cutting unit 90 may be a cutter that cuts out the sheet S into a shape that matches the forming dies 201 and 202 of the forming unit 200 described below. In addition, for example, the cutting unit 90 may include a first cutting unit that cuts the sheet S in a direction that intersects the sheet S conveying direction indicated by reference numeral F2 in the drawing. The cutting unit 90 may include a second cutting unit that cuts the sheet S in a direction parallel to the transport direction F2 in addition to the first cutting unit.

The sheet S cut by the cutting unit 90 is transported to the forming unit 200 by the transport unit 95.
The forming section 200 includes a pair of forming dies 201 and 202. The molding die 201 and the molding die 202 are molds that fit each other, and are formed in the shape of the diaphragm CP. The forming unit 200 forms the diaphragm CP by sandwiching the sheet S between the forming die 201 and the forming die 202 and pressing and heating the sheet S.

  The transport unit 95 transports the sheet S cut by the cutting unit 90 between the molding die 201 and the molding die 202. The transport section 95 performs a transport step (step SA9). Further, the transporting step (step SA9) may include the operation of the cutting unit 90. The forming section 200 performs a forming step (step SA10).

The molding die 201 and the molding die 202 are press dies having a shape that fits each other as a male die and a female die, and are pressed with a predetermined pressure across the sheet S. The forming unit 200 forms, for example, a truncated cone-shaped diaphragm CP.
As a configuration in which the molding unit 200 heats the sheet S, a heater is built in at least one of the molding die 201 and the molding die 202, and the sheet S is heated by each of the molding die 201 and the molding die 202, or any one of them. Is mentioned. In this case, the forming unit 200 may perform heating and pressing of the sheet S at the same time or at different timings.

  The forming unit 200 may heat the forming mold 201 and the forming mold 202 from the outside after pressing the sheet S between the forming mold 201 and the forming mold 202 or in a pressurized state. Specifically, the molds 201 and 202 may be housed in a housing having a heater, and the sheet S may be heated together with the molds 201 and 202. The heater may be an electric heater or a microwave heating device. Further, the sheet S may be heated by supplying superheated steam between the molds 201 and 202.

The temperature at which the forming section 200 heats the sheet S is desirably a temperature at which the properties of the resin contained in the additive material AD are changed.
When the additive material AD contains a thermoplastic resin, the molding unit 200 performs heating at 170 ° C. for 10 minutes, for example. Specifically, the temperature at which the molding section 200 heats is preferably a temperature equal to or higher than the glass transition temperature, melting point, or softening point of the thermoplastic resin contained in the additive material AD. For example, the heating temperature of the forming section 200 can be set to a temperature equal to or higher than the glass transition point of the additive material AD and equal to or lower than the melting point. Further, the temperature may be higher than the melting point. The heating time by the molding unit 200 is set to a time period at which the thermoplastic resin sandwiched between the molding dies 201 and 202 can be sufficiently melted or softened, and is, for example, 10 minutes or more.

  When the additive material AD contains a heat-expandable material, the temperature at which the molding section 200 heats is preferably equal to or higher than the temperature at which expansion or foaming of the heat-expandable material occurs. In this case, the heating time by the molding unit 200 is set to a time that can sufficiently expand the thermally expandable material sandwiched between the molding dies 201 and 202, and is, for example, 10 minutes or more.

  When the additive material AD contains a thermosetting resin, the temperature at which the molding unit 200 performs heating is preferably equal to or higher than the temperature at which phase transition or curing of the thermosetting resin occurs. The heating time by the molding unit 200 is set to a time that can sufficiently cure the thermosetting resin sandwiched between the mold 201 and the mold 202, and is, for example, 10 minutes or more.

  The operation of the diaphragm manufacturing apparatus 100 described above is controlled by the control device 110. The control device 110 includes at least a defibrating unit 20, an additive supply unit 52, a mixing blower 56, a dispersing unit 60, a second web forming unit 70, a pressurizing and heating unit 80, a cutting unit 90, a conveying unit 95, and a forming unit. By controlling 200, the method of manufacturing diaphragm CP shown in FIG. 2 is executed. Further, the control device 110 may control the operations of the supply unit 10, the sorting unit 40, the first web forming unit 45, and the rotating body 49.

  The diaphragm manufacturing apparatus 100 manufactures the diaphragm CP by a so-called dry process in which the mixture MX is dispersed and deposited in the atmosphere. As a technique for molding a material containing fibers, as described above, a papermaking method in which fibers are dispersed in a fluid is known as a technique in contrast to the diaphragm manufacturing apparatus 100. Specifically, it is a so-called wet papermaking in which fibers such as pulp are dispersed to form paper. Wet papermaking is a molding method utilizing hydrogen bonding between fibers, and has the characteristic that hydrogen is strongly used between fibers because water is used, and it is difficult to secure a large distance between fibers. Therefore, after molding, the density of the fibers is high, and it is difficult to produce a low-density molded body. In addition, wet papermaking uses a large amount of water, and therefore requires equipment for water supply and drainage.

  A diaphragm for a speaker is required to have uniformity in order to obtain good sound quality. When a material other than the fiber is added as in the case of the additive material AD of the present embodiment, it is desirable that the material to be added be present uniformly in the plane without any bias in the structure of the diaphragm. In wet papermaking, since a plurality of materials are dispersed in water, deviation or aggregation may occur depending on the shape, specific gravity, hydrophilicity / hydrophobicity, solubility, and dispersibility of each material. For this reason, there is a possibility that unevenness of components and unevenness of thickness may occur in the process of wet papermaking.

It is known that, as characteristics of a diaphragm for a speaker, low density, high rigidity, and high internal loss are required to obtain good sound quality.
In the diaphragm manufacturing apparatus 100 of the present embodiment and the method of manufacturing the diaphragm CP executed by the diaphragm manufacturing apparatus 100, the mixture MX containing the fibers defibrated in a dry manner by the defibrating unit 20 is dispersed in the atmosphere. The method of depositing is adopted. According to this method, a diaphragm CP having low density, high rigidity, and high internal loss can be manufactured as described later.

[1-3. Configuration of diaphragm]
FIG. 4 is an explanatory diagram showing the configuration of the diaphragm CP, and specifically shows a state of crosslinking by the additive material AD.
Reference numeral 15 in FIG. 4 denotes fibers included in the mixture MX, and reference numeral 16 denotes resin particles included in the additive material AD. State A is a state in which the fibers 15 and the resin 16 are mixed.

  In the mixing step (step SA5), the material MC and the additive material AD are mixed by the mixing blower 56, so that the resin 16 adheres to the fibers 15 as in state B shown in FIG. The mixture MX maintains the state B in the sieving step (step SA6) and the deposition step (step SA7). In a state B shown in FIG. 4, a large number of resins 16 are attached to the fibers 15.

  Thereafter, when the second web W2 or the sheet S is heated in the pressure heating step (step SA8) and the forming step (step SA10), the particles of the resin 16 melt and crosslink the fibers 15 with the fibers 15. And combine. This combined state is shown as state C in FIG. In the state C, the plurality of fibers 15 are cross-linked by the resin 16 and bonded. The particles of the resin 16 are melted to crosslink the fibers 15 and the fibers 15 at the crosslink points BP and bond them. For this reason, a suitable space is secured between the fiber 15 and the other fiber 15 at locations other than the cross-linking point BP. At this time, since the resin 16 adheres to the fibers 15 while having a dot shape or an uneven shape, a crosslinking point is more easily formed, and a space is easily formed between the fibers 15 and other fibers 15.

  The diaphragm manufacturing apparatus 100 disperses the mixture MX containing the fibers separated from the defibrated material MB and the additive material AD in the air in the sieving process (step SA6) and deposits the mixture in the deposition process (step SA7). . For this reason, each fiber 15 is deposited and laminated in a random arrangement and orientation. The laminated fibers 15 maintain an appropriate space, and maintain the structure while being partially in point contact with other fibers. Since the resin 16 is adhered to the fiber 15, the resin 16 is heated and melted, softened, or hardened, so that the plurality of fibers 15 in a point-like contact form a cross-linking point as shown in state C. Crosslinked with BP.

  In this manner, the heated resin 16 forms a cross-linking structure between the fibers 15 that are in contact with or close to each other, and combines the fibers 15 to build the rigidity of the structure of the diaphragm CP while maintaining the gap of the structure of the diaphragm CP. . The gap of the diaphragm CP has an effect of reducing the density of the diaphragm CP. Further, since the fibers 15 are crosslinked at a plurality of crosslinking points BP, the diaphragm CP can have high rigidity. Further, since the plurality of fibers 15 are cross-linked in a point-like manner at the cross-linking points BP, high internal loss of the diaphragm CP can be realized. Therefore, the diaphragm CP has a high level of performance required for a speaker diaphragm, such as low density, high rigidity, and high internal loss.

  The resin 16 that has not contributed to the cross-linking structure has an effect of coating the surface of the fiber 15, whereby an effect of improving the rigidity of the fiber 15 can be expected. Further, the resin 16 acts as a minute deformation region in the structure of the diaphragm CP, absorbs shock and energy applied to the diaphragm CP, and releases and relaxes as thermal energy. Therefore, the resin 16 that does not participate in the bonding exhibits a function such as a shock absorption function and a noise absorption function as an internal loss, so that an improvement in the effect of increasing the internal loss of the diaphragm CP can be expected.

  As described above, according to the diaphragm manufacturing apparatus 100, a low-density, lightweight diaphragm CP can be obtained. Further, in the method of manufacturing the diaphragm CP of the present embodiment, the resin 16 for binding the fibers as the additive material AD is added as particles, and the fibers 15 are bound by the particles. Therefore, the portion of the fiber 15 other than the cross-linking point BP has free mobility. As a result, even when an impact or energy is applied, these applied energies can be rapidly attenuated without causing structural destruction or resonance. Further, in the method of manufacturing the diaphragm CP of the present embodiment, the fiber shape and the size and density of the fiber are controlled by controlling the rotation speed of the defibrating unit 20, the supply speed of the raw material MA to the defibrating unit 20, and the like. Easy to control. Further, the additive supply unit 52 can control the addition amount of the additive material AD with a high degree of freedom. It is also possible to control the temperature and pressure in the heating section 84 and the forming section 200. Therefore, a diaphragm CP having high quality can be manufactured as a diaphragm for a speaker.

  Further, diaphragm manufacturing apparatus 100 forms sheet S by pressing and heating second web W2 in pressurizing and heating unit 80, sets sheet S in forming unit 200, and executes a forming process including heating. I do. Since the sheet S has a higher strength than the second web W2, the sheet S is less likely to be damaged in the process of transporting the sheet S to the forming unit 200 by the transport unit 95. Therefore, diaphragm CP can be manufactured efficiently and at high speed. Further, by cutting the sheet S with the cutting unit 90 before setting the sheet S in the forming unit 200, the processing efficiency in the forming unit 200 can be increased.

Preferred characteristics of the diaphragm CP formed in the forming step (step SA10) will be disclosed.
The ratio between the fiber 15 and the resin 16, that is, the fiber: resin ratio, is preferably fiber: resin ratio = 5: 95 to 95: 5. In particular, it is more preferable that the fiber: resin ratio = 40: 60 to 95: 5. More specifically, the fiber density per 1 cm ^{3 of} diaphragm CP is 0.0003 g / cm ³ or more and 1.5 g / cm ³ or less, and the resin density is 0.001 g / cm ³ or more and 1.5 g / cm ^3. It is preferably ³ or less. More preferably, the fiber density per 1 cm ³ of the diaphragm CP is less 0.095 g / cm ³ or more 0.9 g / cm ^3, the resin density of 0.005 g / cm ³ or more 0.9 g / cm ³ or less is there.
The thickness of the diaphragm CP is preferably 7.5 mm or less.
It is preferable that the basis weight of diaphragm CP be 10 g / m ² or more and less than 700 g / m ² . The basis weight is a so-called basis weight.

FIG. 5 is an explanatory diagram showing a configuration of the diaphragm CP, and shows a cross-linked state when a thermally expandable material is used.
The example shown in FIG. 5 is an example in which an additive material AD containing a resin and a thermally expandable material is added to a material MC in an addition step (step SA4). Reference numeral 17 in FIG. 5 denotes particles of expanded particles contained in the additive material AD. The expanded particles 17 correspond to a thermally expandable material. State A shows a state in which the fiber 15 and the additive material AD are mixed.

  In the mixing step (step SA5), when the material MC and the additive material AD are mixed by the mixing blower 56, the resin 16 and the foamed particles 17 adhere to the fiber 15 as in state B. The mixture MX maintains the state B in the sieving step (step SA6) and the deposition step (step SA7).

  When the second web W2 or the sheet S is heated in the pressurizing and heating step (step SA8) and the forming step (step SA10), the expanded particles 17 expand to expand the distance between the fibers 15 or the fibers 15. Hold. In this state, the particles of the resin 16 are melted, and the fibers 15 and 15 are crosslinked and bonded. The crosslinked state is shown as state C in FIG. In the state C, the plurality of fibers 15 are cross-linked by the resin 16. By melting the particles of the resin 16, the fibers 15 and the fibers 15 are cross-linked at the cross-linking point BP and bonded. In addition, at locations other than the cross-linking point BP, a space is secured between the fiber 15 and another fiber 15 by the expanded foamed particles 17.

  As described above, the diaphragm manufacturing apparatus 100 disperses and deposits the mixture MX in the atmosphere, so that a space between the fibers 15 can be secured. Furthermore, when the foamed particles 17 are included in the additive material AD, the foamed particles 17 attached to the fibers 15 expand by heating, so that the contact between the fibers 15 and the fibers 15 is surely a point-like contact. Can be. For this reason, in the state C, the state where the fiber 15 and another fiber 15 are cross-linked in a point-like manner at the cross-linking point BP can be realized more reliably.

  Similarly to the example described with reference to FIG. 4, even when the additive material AD including the expanded particles 17 is used, a diaphragm CP having low density, light weight, high rigidity, and high internal loss can be obtained. Further, by adding the foaming particles 17 in the addition step (step SA4), the diaphragm CP can have a still lower density, a higher rigidity, and a higher internal loss.

Preferred characteristics of the diaphragm CP formed in the molding step (step SA10) when the additive material AD includes a thermally expandable material will be disclosed.
The fiber density per 1 cm ^{3 of the} diaphragm CP is 0.0003 g / cm ³ or more and 1.5 g / cm ³ or less, and the resin density is 0.001 g / cm ³ or more and 1.5 g / cm ³ or less. it is preferable density of the particles is 0.00001 / cm ³ or more 1.5 g / cm ³ or less. More preferably, the fiber density per 1 cm ³ of the diaphragm CP is less 0.095 g / cm ³ or more 0.9 g / cm ^3, the resin density of 0.005 g / cm ³ or more 0.9 g / cm ³ or less There, the foamed particle density is less than 0.00001 / cm ³ or more 0.9 g / cm ^3. Further, the expanded particles 17 are preferably covered with a resin, and the coverage of the expanded particles with the resin is preferably 10% or more and 100% or less.
The thickness of the diaphragm CP is preferably 7.5 mm or less.
It is preferable that the basis weight of diaphragm CP be 10 g / m ² or more and less than 700 g / m ² .

FIG. 6 is an explanatory diagram showing a configuration of the diaphragm CP, and shows a cross-linked state when the core-sheath structure fiber 18 is used.
The example shown in FIG. 6 is an example in which the additive material AD including the core-sheath structure fiber 18 is added to the material MC in the addition step (step SA4). State A of FIG. 6 shows the core-sheath structure fiber 18 in the additive material AD.

  The core-sheath structure fiber 18 is a fibrous synthetic resin in which a resin layer 18b is formed on the surface of a resin fiber 18a. Each of the resin fibers 18a and the resin layer 18b is made of a thermoplastic resin. The resin fiber 18 a is a synthetic fiber having a strength as a fiber, and preferably has the same rigidity and / or tensile strength as the fiber 15. Further, it is preferable that the size of the core-sheath structure fiber 18, that is, the fiber length and the fiber diameter are approximately the same as those of the fiber 15. That is, it is preferable to set the same degree as the fibers included in the defibrated material MB.

  The glass transition temperature of the resin fiber 18a is higher than the glass transition temperature of the resin layer 18b. Further, the softening point temperature of the resin fiber 18a may be higher than that of the resin layer 18b. Therefore, when the core-sheath structure fiber 18 is heated, the resin layer 18b softens or melts at a lower temperature than the resin fiber 18a.

When the additive material AD containing the core-sheath structure fiber 18 is added to the material MC, the fiber 15 and the core-sheath structure fiber 18 are mixed as shown in a state B.
The fiber 15 and the core-sheath structure fiber 18 may come into contact with each other, but maintain a state in which they are not completely adhered due to their rigidity.

  When the core-sheath structure fiber 18 is pressurized and heated in the pressurizing / heating unit 80 or the forming unit 200, the core-sheath structure fiber 18 comes into contact with the fiber 15. Here, when the resin layer 18b is melted or softened by heating, the core-sheath structure fiber 18 and the fiber 15 are crosslinked at the crosslinking point BP by the resin layer 18b. Since the core-sheath structure fibers 18 and the fibers 15 are in point contact with each other due to their rigidity, a space is generated between the core-sheath structure fibers 18 and the fibers 15 at locations other than the cross-linking point BP. Although not shown, the core-sheath structure fiber 18 is cross-linked and bonded to the plurality of fibers 15, so that the diaphragm CP having a three-dimensional cross-linked structure is similar to the example shown in FIGS. 4 and 5. Is obtained.

  As described above, the diaphragm manufacturing apparatus 100 disperses and deposits the mixture MX in the atmosphere, so that a space between the fibers 15 can be secured. Furthermore, when the core-sheath structure fiber 18 is included in the additive material AD, the rigidity of the core-sheath structure fiber 18 ensures that the contact between the fiber 15 and the core-sheath structure fiber 18, and between the fiber 15 and the fiber 15, is improved. Contact. For this reason, in the state C, a state in which the fiber 15, the core-sheath structure fiber 18, and the other fiber 15 are cross-linked in a point-like manner at the cross-linking point BP can be realized more reliably.

  Then, similarly to the example described with reference to FIG. 4, even when the additive material AD including the core-sheath structure fiber 18 is used, it is possible to obtain the diaphragm CP having low density, light weight, high rigidity, and high internal loss. it can.

As described above, the diaphragm CP manufactured by the diaphragm manufacturing apparatus 100 according to the first embodiment has a defibrated material MB obtained by defibrating the raw material MA, which is a material containing fibers, and a bond for binding the fibers. And an additive material AD containing a material. The diaphragm CP is a speaker diaphragm formed by a molding process including pressing and heating.
Since the diaphragm CP is obtained by adding the additive material (resin particles) AD to the defibrated material MB obtained by defibrating the material, the bias and aggregation of the fibers 15 and the resin 16 are suppressed, and the fibers 15 are uniformly dispersed. And the resin 16 are distributed. The diaphragm CP has a configuration in which the fibers 15 are uniformly distributed and cross-linked by the resin 16, and since the defibrated fibers 15 are used, the fibers 15 are cross-linked to other fibers 15 in a dot-like manner. Therefore, diaphragm CP is low-density and lightweight, has large internal loss, and has high rigidity due to crosslinking. Therefore, the diaphragm CP has preferable characteristics as a diaphragm for a speaker. In addition, it is preferable that the defibrated material MB be defibrated in the air, because the deviation and aggregation of the fibers 15 and the resin 16 are more effectively suppressed.

  In diaphragm CP, the bonding material (resin particles) contains at least one of a thermoplastic resin and a thermosetting resin. Therefore, a configuration in which the fibers 15 are crosslinked by the resin 16 can be easily realized by processing including heating, and vibration having characteristics of low density, high rigidity, and high internal loss, which is preferable as a diaphragm for a speaker. A plate CP can be provided.

  In the case where the additive material AD includes the foamed particles 17 as a thermally expandable material, the diaphragm CP is configured to include the thermally expandable material. In this case, the interval between the fiber 15 included in the diaphragm CP and the other fiber 15 is ensured by the expanded particles 17, and the fiber 15 may be in a point-like contact with the other fiber 15 and crosslinked. it can. The diaphragm CP has a lower density, a large internal loss, a high rigidity due to crosslinking, and has desirable characteristics as a diaphragm for a speaker.

  The diaphragm manufacturing apparatus 100 includes a defibrating unit 20 for defibrating the raw material MA as a material containing the fibers 15 and a defibrated material MB defibrated in the defibrating unit 20 as a binding material for crosslinking the fibers 15. A mixing section 50 for mixing the additive material AD containing the resin 16. The diaphragm manufacturing apparatus 100 includes a second web forming unit 70 as a deposition unit that deposits the mixture MX mixed in the mixing unit 50. The diaphragm manufacturing apparatus 100 includes a forming unit 200 that forms the second web W2 deposited by the second web forming unit 70 on the diaphragm CP by a forming process including pressurization and heating.

  The speaker diaphragm manufacturing apparatus and the diaphragm manufacturing apparatus 100 to which the speaker diaphragm manufacturing method of the present invention is applied add and mix the additive material AD to the defibrated material MB obtained by defibrating the raw material MA. For this reason, the fiber 15 contained in the raw material MA and the additive material AD can be mixed while suppressing bias and aggregation. For this reason, diaphragm CP manufactured by diaphragm manufacturing apparatus 100 can have a configuration in which fibers 15 and additive material AD are homogeneously distributed. Thus, the fibers 15 can be uniformly distributed and cross-linked by the resin 16 by the molding unit 200 performing the molding process. In detail, since the fibers 15 are homogeneously mixed with the resin 16, the fibers 15 are cross-linked with other fibers 15 in a point-like manner by the molding process of the molding section 200. Therefore, diaphragm CP is low-density and lightweight, has large internal loss, and has high rigidity due to crosslinking. Therefore, the diaphragm CP has preferable characteristics as a diaphragm for a speaker.

  The mixing section 50 disperses the mixture, and the second web forming section 70 as a deposition section deposits the mixture MX. For this reason, the fibers 15 contained in the material MC and the resin 16 of the additive material AD can be mixed while suppressing bias and aggregation.

  The mixing section 50 may mix the defibrated material MB with the resin 16 and the foamed particles 17 that expand when heated. That is, the additive material AD including the resin 16 and the expanded particles 17 may be mixed with the material MC derived from the defibrated material MB. In this case, the interval between the fiber 15 included in the diaphragm CP and the other fiber 15 is ensured by the expanded particles 17, and the fiber 15 is in contact with the other fiber 15 in a point-like manner and is crosslinked by the resin 16. can do. Therefore, it is possible to provide a diaphragm CP having a lower density, a large internal loss, a high rigidity due to cross-linking, and a desirable characteristic as a diaphragm for a speaker.

  The mixing section 50 mixes the defibrated material with a binding material containing at least one of a thermoplastic resin and a thermosetting resin. Therefore, the configuration in which the fibers 15 are cross-linked by the resin 16 can be easily realized by performing the molding process including heating by the molding unit 200, and the diaphragm CP having preferable characteristics as a diaphragm for a speaker can be provided.

  The second web forming unit 70 forms the second web W2 by depositing the mixture MX. The diaphragm manufacturing apparatus 100 includes a pressing and heating unit 80 that presses and heats the second web W2 to form the sheet S. The forming unit 200 presses and heats the sheet S set in the forming die in the forming process. According to this configuration, since the material of the diaphragm CP is the sheet-like sheet S, the step of setting the material in the forming unit 200 can be easily performed. Further, it is also easy to temporarily store the sheet S at a stage before the forming process is performed by the forming unit 200. Therefore, the manufacturing efficiency of the diaphragm CP can be improved.

[2. Second Embodiment]
FIG. 7 is a flowchart illustrating a method of manufacturing the diaphragm CP of the second embodiment.
In the manufacturing process of the diaphragm CP of the second embodiment, after the second web W2 is formed in Step SA7, the pressurizing and heating process (Step SA8) illustrated in FIG. 2 is not performed. In the manufacturing process of the diaphragm CP according to the second embodiment, steps SA1 to SA7 are the same as the manufacturing processes described in the first embodiment, and thus description thereof will be omitted.

  The manufacturing process of the diaphragm CP of the second embodiment includes a transport process (Step SB1) of transporting the second web W2 formed in Step SA7 to the forming unit 200. In the transporting step (step SB1), the second web W2 is transported to the forming section 200 without being pressed or heated. Further, the second web W2 may be cut in the transport step (Step SB1).

  Thereafter, the molding step of step SB2 is performed. The forming step (step SB2) is a step of pressing and heating the second web W2 with a forming die to form the diaphragm CP.

FIG. 8 is a configuration diagram of a diaphragm manufacturing apparatus 100A according to the second embodiment.
The diaphragm manufacturing apparatus 100A has a cutting section 90A instead of the cutting section 90 of the diaphragm manufacturing apparatus 100 shown in FIG. 2, a transport section 95A instead of the transport section 95, and the pressurizing and heating section 80 is omitted. Configuration. In the diaphragm manufacturing apparatus 100A, the same components as those of the diaphragm manufacturing apparatus 100 are denoted by the same reference numerals and description thereof will be omitted. The diaphragm manufacturing apparatus 100A is equivalent to a speaker diaphragm manufacturing apparatus.

  The diaphragm manufacturing apparatus 100A picks up and transports the second web W2 formed by the second web forming unit 70 from the mesh belt 72 by the web transport unit 79. The cutting section 90A cuts the second web W2. The cutting portion 90A may be a cutter that cuts out the second web W2 into a shape that matches the molds 201 and 202. Further, for example, the cutting unit 90A may include a first cutting unit that cuts the second web W2 in a direction that intersects the transport direction F3 of the second web W2. Further, the cutting unit 90A may be configured to include, in addition to the first cutting unit, a second cutting unit that cuts the second web W2 in a direction parallel to the transport direction F3.

  The second web W2 cut by the cutting unit 90 is transported to the forming unit 200 by the transport unit 95A. The transport unit 95A may be different from the transport unit 95 that transports the sheet S and may have a configuration that is lower in rigidity than the sheet S and is suitable for transporting the low-strength second web W2. For example, the transport unit 95A may be a conveyor that includes a roller having a larger diameter than the roller of the transport unit 95 and transports the second web W2.

  The forming unit 200 presses and heats the second web W2 between the pair of forming dies 201 and 202 to form the diaphragm CP.

  The transport unit 95A performs a transport step (Step SB1). Further, the transporting step (step SB1) may include the operation of the cutting unit 90A. The operation of the forming section 200 corresponds to a forming step (step SB2).

  The shapes, pressurizing conditions, and heating conditions of the mold 201 and the mold 202 are the same as in the first embodiment. Further, the configuration in which the second web W2 is heated by the forming unit 200 can be common to the configuration in which the forming unit 200 heats the sheet S in the first embodiment.

  According to the diaphragm manufacturing apparatus 100A and the method of manufacturing the diaphragm CP executed by the diaphragm manufacturing apparatus 100A, the same effects as those of the diaphragm manufacturing apparatus 100 described in the first embodiment can be obtained. Further, in the diaphragm manufacturing apparatus 100A, it is of course possible to add the expanded particles 17 and the core-sheath structure fibers 18 to the additive material AD.

  Further, diaphragm manufacturing apparatus 100A sets second web W2 formed by second web forming section 70 in forming section 200, and forming section 200 adds second web W2 set in forming dies 201 and 202. Pressure and heat. According to this configuration, the step of processing the second web W2 into the sheet S can be omitted, so that the manufacturing efficiency of the diaphragm CP can be increased and the manufacturing lead time can be improved. Further, by controlling the conditions of pressurization and heating of the molding unit 200, the change in the state of the mixture MX due to pressurization and heating can be controlled in more detail. That is, there is an advantage that the structure and characteristics of the diaphragm CP can be more easily adjusted by considering the influence of one pressurization and heating on the state of the fiber and the additive material AD included in the mixture MX.

[3. Third Embodiment]
FIG. 9 is a flowchart illustrating a method of manufacturing the diaphragm CP according to the third embodiment.
In the manufacturing process of the diaphragm CP of the third embodiment, a deposition process (Step SC1) of dispersing the mixture MX in the sieve process of Step SA6 and depositing the mixture MX on the mold 202 is executed. In the manufacturing process of the diaphragm CP according to the third embodiment, steps SA1 to SA6 are the same as the manufacturing processes described in the first embodiment, and thus description thereof will be omitted.

  The manufacturing process of the diaphragm CP of the third embodiment includes a deposition process (Step SC1) of depositing the mixture MX dispersed in Step SA6 on the molding die 202. In the deposition step (step SC1), the mold 202 is arranged at a position where the mixture MX descends, and the mixture MX is deposited on the mold 202.

  Subsequently, a carrying step (step SC2) of carrying the mold 202 is performed. In the transport step (Step SC2), the molding die 202 is transported to a position where the molding die 202 is fitted. Subsequently, a molding step (step SC3) is performed. In the forming step (step SC3), pressure and heating are performed under the same conditions as in the forming step (step SB2), and the diaphragm CP is formed.

FIG. 10 is a configuration diagram of a diaphragm manufacturing apparatus 100B according to the third embodiment.
The diaphragm manufacturing apparatus 100B includes a dispersing section 60B and a stacking section 95B instead of the dispersion section 60 and the second web forming section 70 of the diaphragm manufacturing apparatus 100 shown in FIG. 90 and the transport unit 95 are omitted. In the diaphragm manufacturing apparatus 100B, the same components as those of the diaphragm manufacturing apparatus 100 are denoted by the same reference numerals, and description thereof will be omitted. The diaphragm manufacturing apparatus 100B corresponds to a speaker diaphragm manufacturing apparatus. The deposition section 95B corresponds to a deposition section.

  The dispersion unit 60B includes a housing 63B that is larger than the housing 63 of the dispersion unit 60. The housing 63B has a size that can accommodate the molding die 202. Dispersion drum 61B configured similarly to dispersion drum 61 is arranged inside housing 63B. The dispersion drum 61B, like the dispersion drum 61, rotates to disperse the mixture MX into the atmosphere inside the housing 63B and lower it. The operation of the dispersion unit 60B corresponds to a sieving step (step SA6).

In the housing 63B, a molding die 202 is located below the dispersion drum 61B.
As shown in FIGS. 3 and 8, the mold 202 is formed in a truncated conical shape in order to form the conical diaphragm CP. The molding die 202 is located below the dispersion drum 61B in a direction that becomes convex upward.

The forming part 200 is configured by combining a truncated conical forming die 202 that is convex upward and a forming die 201 that has a fitting part 201A that is positioned above the forming die 202 and that is convex upward. You. The upper surface of the mold 202 is a mounting surface 202A on which the material is mounted.
The mixture MX is deposited on the mounting surface 202A to form the deposit DP. The side of the deposit DP that is in contact with the mounting surface 202A is the surface 1002 of the diaphragm CP.

In order to make the shape of the diaphragm CP conical, the forming part 200 may be configured to be upside down. That is, the molding die 202 having a mortar-shaped concave portion having a deep center and the molding die 201 projecting downward toward the molding die 202 may be combined.
However, in the diaphragm manufacturing apparatus 100B of the third embodiment, the forming die 202 having the mounting surface 202A in the shape of a truncated cone that is upwardly convex is preferable.

  In the dispersing section 60B, in the deposition step of depositing the mixture MX on the mounting surface 202A (step SC1), since the mounting surface 202A is convex upward, the deposition state of the mixture MX on the slope of the mounting surface 202A. Has the advantage of being easily uniform. If the mounting surface 202A has a mortar shape, a large amount of the mixture MX is deposited so as to descend on the slope of the mounting surface 202A. Therefore, an unexpectedly large amount of the mixture MX accumulates inside the mounting surface 202A. there is a possibility. That is, when the shape of the mounting surface 202A is convex downward, the action of collecting a large amount of the mixture MX works, and the thickness of the deposit DP tends to be uneven. Therefore, fine adjustment and control for making the thickness of the deposit DP uniform are required.

  On the other hand, when the molding die 202 located below the dispersion drum 61B is arranged so that the mounting surface 202A is convex upward, the slope of the mounting surface 202A has an effect of collecting a large amount of the mixture MX. Absent. For this reason, unevenness in the thickness of the deposit DP can be prevented. Therefore, in the deposition step (step SC1), it is preferable that the molding die 202 having the mounting surface 202A having a truncated cone shape is disposed below the dispersion drum 61B in a direction in which the mounting surface 202A is convex upward.

  The deposition unit 95B has a function of positioning the forming die 202 below the dispersion drum 61B and transporting the forming die 202 to the position of the forming unit 200. The deposition unit 95B has an unsupported belt 97 wound around a tension roller 96, and the belt 97 can be circulated so that the molding die 202 can be placed and moved. The belt 97 reaches the position of the forming die 201 of the forming unit 200, and the forming die 202 is conveyed from below the dispersion drum 61B to below the forming die 201 by the stacking unit 95B.

  The operation of the deposition unit 95B corresponds to a transport step (Step SC2). The operation of the forming section 200 corresponds to a forming step (step SC3).

  The shapes, pressurizing conditions and heating conditions of the mold 201 and the mold 202 are the same as in the second embodiment. Further, the configuration in which the forming unit 200 heats the deposit DP can be common to the configuration in which the forming unit 200 heats the sheet S in the first embodiment.

  According to the diaphragm manufacturing apparatus 100B and the method of manufacturing the diaphragm CP executed by the diaphragm manufacturing apparatus 100B, the diaphragm manufacturing apparatus 100B is the same as the diaphragm manufacturing apparatuses 100 and 100A described in the first and second embodiments. The effect of can be obtained. Further, in the diaphragm manufacturing apparatus 100B, it is of course possible to add the expanded particles 17 and the core-sheath structure fibers 18 to the additive material AD.

  Further, diaphragm manufacturing apparatus 100 </ b> B deposits mixture MX on mold 202 to form deposit DP in which mixture MX is stacked, and heats deposit DP by molding unit 200. Therefore, a step of forming and transporting the second web W2 and a step of processing the second web W2 into the sheet S can be omitted. For this reason, the manufacturing efficiency of the diaphragm CP can be increased. Further, by controlling the conditions of pressurization and heating of the forming section 200, the state change of the deposit DP due to pressurization and heating can be controlled in more detail. That is, there is an advantage that the structure and characteristics of the diaphragm CP can be more easily adjusted by considering the influence of one pressurization and heating on the state of the fibers and the additive material AD included in the deposit DP. .

[4. Fourth embodiment]
FIG. 11 is a flowchart illustrating a method of manufacturing the diaphragm CP according to the fourth embodiment.
In the manufacturing process of the diaphragm CP of the fourth embodiment, after the diaphragm CP is formed in Step SA10, a sub-material adding step (Step SD1) is performed. In the manufacturing process of the diaphragm CP according to the fourth embodiment, steps SA1 to SA10 are the same as the manufacturing processes described in the first embodiment, and thus description thereof will be omitted.

  The sub-material adding step (step SD1) is a step of attaching a sub-material to the front surface 1002 or the back surface 1004 of the diaphragm CP. In the sub material addition step, for example, an ejection head 301 that ejects a liquid sub material from a nozzle can be used. The ejection head 301 has a configuration in which the auxiliary material is ejected by heating or using a piezo element. For example, the ejection head 301 can have the same configuration as a print head of an inkjet printer.

  The sub-material adding step (step SD1) may include a step of drying or fixing the sub-material attached to the diaphragm CP.

FIG. 12 is a configuration diagram of a diaphragm manufacturing apparatus 100C according to the fourth embodiment.
The diaphragm manufacturing apparatus 100C has a configuration in which the material injection unit 300 is provided in the diaphragm manufacturing apparatus 100 illustrated in FIG. In the diaphragm manufacturing apparatus 100C, the same components as those of the diaphragm manufacturing apparatus 100 are denoted by the same reference numerals and description thereof will be omitted. The diaphragm manufacturing apparatus 100C is equivalent to a speaker diaphragm manufacturing apparatus.

After the diaphragm CP is formed in the forming unit 200, the forming die 202 is conveyed to the material ejecting unit 300 with the diaphragm CP placed thereon.
The material ejecting section 300 includes an ejection head 301. The ejection head 301 is movably disposed above the molding die 202, and ejects the liquid auxiliary material DR from the ejection head 301. Although not shown, the material ejecting unit 300 may include a tank that stores the liquid sub-material DR, a supply pipe that supplies the liquid sub-material DR from the tank to the ejection head 301, and the like. The material injection unit 300 corresponds to an adhesion processing unit. The liquid auxiliary material DR corresponds to an auxiliary material.
By moving the ejection head 301 while ejecting the liquid sub-material DR from the ejection head 301, the liquid sub-material DR can be attached to the vibration plate CP on the molding die 202.

  The material injection unit 300 causes the liquid sub-material DR to adhere to the diaphragm CP. The material ejecting unit 300 may cause the liquid sub-material DR to adhere to the front surface 1002 or the rear surface 1004 of the diaphragm CP. When attaching the liquid sub-material DR to the back surface 1004, the diaphragm manufacturing apparatus 100C may have a mechanical transport unit that takes out the diaphragm CP from the mold 202 and turns it upside down.

  The liquid auxiliary material DR may be either an aqueous solution or an organic solution. For example, a liquid containing glycerin can be used as a humectant using an acrylic dispersion as a solvent. Further, the liquid sub-material DR may be a liquid of the sub-material itself instead of the solution. In addition, the liquid sub-material DR may include a resin that adheres to the diaphragm CP and then cures by drying. In addition, the liquid sub-material DR may include a resin that is cured by heating.

  Further, the material ejecting unit 300 may have a configuration including an auto stage or a conveyance belt that moves the molding die 202 below the ejection head 301 without moving the ejection head 301.

  When the liquid sub-material DR is attached by the material ejecting unit 300, the configuration of the diaphragm CP is preferably such that the fiber: resin ratio = 5: 95 to 95: 5, and more preferably, the fiber: resin ratio = 5: 95-70: 30.

In addition, the material ejecting unit 300 may be configured to eject a plurality of types of liquid sub-materials DR from the ejection head 301 and attach them to the diaphragm CP.
In addition, the material injection unit 300 may attach the liquid sub-material DR to the entire front surface 1002 and / or the rear surface 1004 of the diaphragm CP, or may attach the liquid auxiliary material DR to a part thereof.

FIGS. 13 to 19 are explanatory diagrams showing specific examples of the sub-material adding step.
Although not shown, the most typical example is an example in which the liquid auxiliary material DR is attached to the entire surface 1002 of the diaphragm CP.

  The example shown in FIG. 13 is an example in which the liquid sub-material DR is attached to the entire surface 1002, and the thickness of the sub-material layer DR1 formed of the liquid sub-material DR is changed. The sub-material layer DR1 is formed on the entire surface 1002, and the thickness of the sub-material layer DR1 becomes larger toward the outer periphery of the diaphragm CP. The control device 110 controls the amount of the liquid sub-material DR ejected from the ejection head 301 and the movement of the ejection head 301 or the movement of the molding die 202 so that the thickness of the sub-material layer DR1 increases from the inner circumference to the outer circumference. A configuration that changes intermittently or continuously can be realized.

  The example shown in FIG. 14 is an example in which the liquid auxiliary material DR is attached to the diaphragm CP so as to draw a plurality of rings. A sub-material layer DR1 composed of the liquid sub-material DR is arranged so as to draw a concentric circle on the surface 1002. The plurality of sub-material layers DR1 have a function of adjusting the propagation of vibration in the diaphragm CP, such as a rib employed in some cone paper.

  The example shown in FIG. 15 is an example in which the liquid sub-material DR is attached to the diaphragm CP so as to draw a plurality of rings, and the liquid sub-material DR is attached so as to draw a dot shape. For this reason, the dot-shaped sub-material layer DR2 is arranged on the surface 1002 so as to draw a ring.

The example shown in FIG. 16 is an example in which the liquid sub-material DR is attached to the entire surface 1002 so as to draw a dot shape. In this example, the dot-like liquid sub-material DR is uniformly distributed on the surface 1002.
The example shown in FIG. 17 is an example in which the liquid sub-material DR is attached to the entire surface 1002 so as to draw a dot shape. In this example, the dot-shaped sub-material layer DR2 is unevenly arranged on the surface 1002.

  The example shown in FIG. 18 is an example in which the liquid auxiliary material DR is attached to the diaphragm CP so as to draw a star shape. On the surface 1002, a star-shaped sub-material layer DR1 is arranged in a region including the bottom 1003. The shape of the sub-material layer DR1 is not limited to the star shape, but may be another graphic shape. For example, the control device 110 controls the movement of the ejection head 301 in the material ejection unit 300 or the movement of the molding die 202 based on the image data, so that the liquid sub-material DR adheres to the shape indicated by the image data. it can. Also, as shown in FIG. 19, characters can be formed from the liquid auxiliary material DR. The example of FIG. 19 is an example in which a liquid sub-material DR is attached to a diaphragm CP so as to draw a character, and a sub-material layer DR1 having a shape representing a character is arranged on the diaphragm CP. As described above, the auxiliary material layer DR1 having various patterns can be formed on the diaphragm CP by the ejection head 301.

As described above, in the diaphragm CP, the sub-material is attached to at least one surface of the surface 1002 which is the vibration surface. The diaphragm manufacturing apparatus 100C includes a material ejecting unit 300 for attaching the liquid sub-material DR to the surface of the diaphragm CP formed by the forming unit 200.
By attaching the liquid auxiliary material DR to the front surface 1002 and / or the back surface 1004 of the diaphragm CP, an effect of increasing the rigidity of the diaphragm CP can be expected. Further, the waterproofness, moistureproofness, antibacterial property, antifungal property, flame retardancy, sustained release property and the like of the diaphragm CP can be imparted or improved. Further, it is also possible to impart new characteristics such as imparting elasticity to the diaphragm CP.

[5. Other Embodiments]
Each of the above-described embodiments is merely a specific mode for carrying out the present invention described in the claims, does not limit the present invention, and does not depart from the gist thereof. Can be implemented in various aspects.

For example, in each of the above-described embodiments, the example in which the conical-shaped diaphragm CP is manufactured using the forming unit 200 including the truncated-cone-shaped forming die 202 has been described, but the diaphragm CP has ribs. It may have another three-dimensional shape.
In the above-described embodiment, the diaphragm manufacturing apparatuses 100, 100A, 100B, and 100C are described as apparatuses for defibrating the raw material MA by the defibrating unit 20 and manufacturing the diaphragm CP. It is also possible to adopt a configuration that is not provided. For example, a configuration may be employed in which the diaphragm CP is manufactured by adding and mixing the additive material AD to a material MC containing fibers that have been previously defibrated.

Further, the color and properties of the diaphragm CP are arbitrary. For example, by adding a coloring agent together with a resin to the additive material AD, the material MC is colored, and the diaphragm CP is formed using a mixture MX of an arbitrary color. It may be manufactured.
Needless to say, the other details can be arbitrarily changed.

  2, 3, 7, 8, 54: tube, 9: hopper, 10: supply unit, 12: crushing unit, 14: crushing blade, 15: fiber, 16: resin, 17: expanded particles (thermally expandable material) ), 18: core-sheath structure fiber, 18a: resin fiber, 18b: resin layer, 20: defibrating unit, 22: stator, 24: rotor, 40: sorting unit, 41: drum unit, 42: inlet, 43 ... Housing part, 44 ... Discharge port, 45 ... First web forming part, 46 ... Mesh belt, 47 ... Tension roller, 48 ... Suction part, 49 ... Rotating body, 50 ... Mixing part, 52 ... Additive supply part 52a: additive cartridge, 52b: additive removal section, 52c: additive introduction section, 56: mixing blower, 60, 60B: dispersion section, 61, 61B: dispersion drum, 62: internal space, 63, 63B: housing, 70: second web forming part, 72: mesh bell 74, a stretch roller, 76, a suction mechanism, 78, a humidity control section, 79, a web transport section, 79a, a mesh belt, 79b, a roller, 79c, a suction mechanism, 80, a pressure heating section, 82, a pressure section 84 heating unit, 85 calender roller, 86 heating roller, 90, 90A cutting unit, 95, 95A transport unit, 95B stacking unit, 96 stretching roller, 97 belt, 100, 100A, 100B 100C: diaphragm manufacturing device (speaker diaphragm manufacturing device), 101: defibrating unit, 102: manufacturing unit, 110: control device, 200: forming unit, 201, 202: forming die, 201A: fitting unit , 202A: mounting surface, 300: material ejection part (adhesion processing part), 301: ejection head, 1002: front surface, 1004: back surface, AD: additive material, BP: crosslinking point, CP Diaphragm (diaphragm for speaker), DP: deposit, DR: liquid auxiliary material (sub-material), DR1, DR2: material layer, F1, F2, F3: transport direction, MA: raw material, MB: defibrated material, MC: material, MX: mixture, S: sheet, W1: first web, W2: second web (sediment, web).

Claims (13)

  A diaphragm for a speaker, comprising: a defibrated material obtained by defibrating a material containing fibers; and a binding material for binding the fibers to each other, and formed by a molding process including pressing and heating.   The diaphragm for a speaker according to claim 1, wherein the bonding material includes at least one of a thermoplastic resin and a thermosetting resin.   The speaker diaphragm according to claim 1, comprising a thermally expandable material.   The speaker diaphragm according to any one of claims 1 to 3, further comprising a vibrating surface, wherein a sub-material is attached to at least one of the vibrating surfaces. A defibrating unit for defibrating materials containing fibers,
A mixing unit that mixes a binding material that binds the fibers to the defibrated material defibrated in the defibrating unit;
A deposition unit for depositing the mixture mixed in the mixing unit;
By a forming process including pressurization and heating, a forming unit that forms the deposits deposited in the depositing unit on the speaker diaphragm,
A diaphragm manufacturing apparatus for a speaker, comprising: The mixing section disperses the mixture,
The speaker diaphragm manufacturing apparatus according to claim 5, wherein the deposition unit deposits the mixture.   The speaker diaphragm manufacturing apparatus according to claim 5, wherein the mixing unit mixes the defibrated material and the binding material with a thermally expandable material that expands when heated.   The diaphragm for a speaker according to any one of claims 5 to 7, wherein the mixing unit mixes the defibrated material and the bonding material containing at least one of a thermoplastic resin and a thermosetting resin. manufacturing device. The deposition unit deposits the mixture to form a web,
The speaker diaphragm manufacturing apparatus according to any one of claims 5 to 8, wherein the forming unit presses and heats the web set in a forming die in the forming process. The deposition unit deposits the mixture to form a web,
A sheet forming unit that forms a sheet by pressing and heating the web,
The speaker diaphragm manufacturing apparatus according to any one of claims 5 to 8, wherein the forming unit presses and heats the sheet set in a forming die in the forming process. The depositing section deposits the mixture on a mold,
The speaker diaphragm manufacturing apparatus according to any one of claims 5 to 8, wherein the molding unit presses and heats the molding die on which the mixture is deposited in the molding processing.   The speaker diaphragm manufacturing apparatus according to any one of claims 5 to 11, further comprising an adhesion processing unit that adheres a sub-material to a surface of the speaker diaphragm formed by the molding unit. Defibrating materials containing fibers,
In the defibrated defibrated material, mixing a binding material for binding the fibers,
Deposit the mixture,
A method for manufacturing a speaker diaphragm, wherein a deposit is formed on the speaker diaphragm by a molding process including pressing and heating.

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