WO2023058651A1 - プレス金型用電気集塵機及びそれを用いたプレス金型 - Google Patents
プレス金型用電気集塵機及びそれを用いたプレス金型 Download PDFInfo
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- WO2023058651A1 WO2023058651A1 PCT/JP2022/037126 JP2022037126W WO2023058651A1 WO 2023058651 A1 WO2023058651 A1 WO 2023058651A1 JP 2022037126 W JP2022037126 W JP 2022037126W WO 2023058651 A1 WO2023058651 A1 WO 2023058651A1
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Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/34—Constructional details or accessories or operation thereof
- B03C3/40—Electrode constructions
- B03C3/45—Collecting-electrodes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/34—Constructional details or accessories or operation thereof
- B03C3/40—Electrode constructions
- B03C3/41—Ionising-electrodes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/34—Constructional details or accessories or operation thereof
- B03C3/40—Electrode constructions
- B03C3/45—Collecting-electrodes
- B03C3/47—Collecting-electrodes flat, e.g. plates, discs, gratings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/34—Constructional details or accessories or operation thereof
- B03C3/40—Electrode constructions
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/34—Constructional details or accessories or operation thereof
- B03C3/66—Applications of electricity supply techniques
- B03C3/68—Control systems therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/34—Constructional details or accessories or operation thereof
- B03C3/66—Applications of electricity supply techniques
- B03C3/70—Applications of electricity supply techniques insulating in electric separators
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D28/00—Shaping by press-cutting; Perforating
Definitions
- the present invention provides an electric dust collector and a press die using the same, which can collect dust such as abrasion powder and dust generated when press working is performed using a press die using electrostatic force. It is about.
- an air purifier such as a filter type or an electrostatic precipitator type, which is generally used as a countermeasure against foreign matter
- electrostatic chuck a so-called gradient force generation is adopted in which a plurality of electrode layers are laminated in the depth direction with an inter-electrode insulating layer interposed in order to further increase the attraction force and holding force of the object.
- type electrostatic chucks have also been conventionally proposed (see, for example, Patent Documents 3 and 4).
- the electrodes used for efficient and rapid chucking or responding to dechucking are made of highly conductive materials such as metals.
- electric chucks the following problems were also a concern. That is, when a voltage is applied between the electrode layers, the insulating layer between the electrodes plays the same role as a capacitor, resulting in electricity storage.
- the present invention has been completed by finding that it can be achieved by using, as an electrode, a PET substrate coated with a conductive polymer and having a predetermined surface resistance value.
- an object of the present invention to provide an electrical power supply for press dies that can more reliably collect dust and foreign matter generated during press working by utilizing electrostatic force and that can be used safely in a press die apparatus.
- An object of the present invention is to provide a dust collector and a press die using the same.
- the gist of the present invention is as follows. [1] An electrostatic precipitator for press dies that is used together with press dies and collects dust and foreign matter generated during press working by electrostatic force, A dust collection layer for holding dust particles in contact with each other, a first electrode layer, a second electrode layer, an insulating layer, and an adhesive fixing layer for setting and fixing to a mold used are laminated.
- the insulating layers include at least a first insulating layer for insulating the dust collection layer and the first electrode, a second insulating layer for insulating the first electrode layer from the second electrode layer, and a second insulating layer for insulating the first electrode layer from the second electrode layer.
- the first and second electrode layers are films of a polyethylene terephthalate (PET) base material coated with a conductive polymer and having a surface resistivity of 10 4 to 10 5 ⁇ , An electrostatic precipitator for a press mold, wherein a polyimide film having a substrate thickness of 75 ⁇ m is used for the second insulating layer.
- PET polyethylene terephthalate
- the first electrode layer has a plurality of missing portions penetrating in the thickness direction of the electrode layer, and the area ratio of the missing portions is 10% to 20% of the entire area of the first electrode layer.
- the electric dust collector for press dies according to [1], wherein the first and second electrode layers are laminated via a second insulating layer in the thickness direction of the laminated sheet. . [3] During use, a negative voltage is applied to the first electrode layer and a positive voltage is applied to the second electrode layer, [1] or [2], wherein the voltage applied to the first electrode layer is 4 to 5 kilovolts (kV) and the voltage applied to the second electrode layer is 2 kilovolts (kV). electrostatic precipitator for press dies.
- the present invention it is possible to more reliably collect dust such as non-magnetic metal dust and fine dust generated during press working by utilizing electrostatic force, and it is easy to install. It is possible to provide an electrostatic precipitator for press dies that can be safely used in the mold apparatus.
- FIG. 1 shows an example of an electrostatic precipitator of the present invention
- (i) is an external perspective view
- (ii) is a cross-sectional explanatory view, and is a part of the AA cross section of (i).
- FIG. 2 is a plan view showing an example of the first electrode layer.
- FIG. 3 is a cross-sectional view showing the state of the electric field generated in the electrostatic precipitator of the present invention.
- FIG. 4 is a photograph for explaining evaluation of adsorptivity of an electrostatic precipitator in Examples.
- a white arrow in the drawing indicates the direction in which the aluminum piece 12 suspended from the copper wire 11 is attracted to the electrostatic precipitator.
- FIG. 5 is a schematic explanatory diagram for explaining how the electrostatic precipitator of the present invention is installed in a press die (a place near the cutting steel material in the lower die) and evaluated.
- the electric dust collector for press dies of the present invention includes at least a dust collection layer 2, a first electrode layer 7, a second electrode layer 8, insulating layers 3 to 5, It is provided with a laminated sheet 1 in which a contact fixing layer 6 for setting and fixing to a mold used is laminated (the laminated sheet 1 may be described without distinguishing it from an electrostatic precipitator).
- the insulating layers include at least a first insulating layer 3 for insulating the dust collecting layer and the first electrode layer, and a second insulating layer 3 for insulating the first electrode layer and the second electrode layer. It has an insulating layer 4 and a third insulating layer 5 for insulating the second electrode layer and the adhesion fixing layer. Furthermore, a power supply device (not shown) that applies a voltage between the first electrode layer and the second electrode layer is provided.
- the electrode layers used in the present invention comprise at least the first electrode layer 7 and the second electrode layer 8, which are preferably insulated in the thickness direction of the laminated sheet. It is preferable to adopt a structure in which a layer (second insulating layer) is interposed. Adopting such a laminated structure is advantageous in that the dust collecting structure can be integrated and the thickness can be reduced, unlike conventional electrostatic precipitators.
- the electrode layer of the present invention has a surface resistivity of 10 4 to 10 5 ⁇ , preferably 10 4 ⁇ , by applying a conductive polymer to a polyethylene terephthalate (PET) substrate as a supporting substrate. Use film.
- the amount of current is suppressed, and the amount of electricity stored in the insulating layer (capacitor) is greatly reduced.
- the stored energy passes through the electrode layer surface, which is a resistance, when flowing into the damaged part, so the electrical energy is greatly reduced. It is possible to reduce the risk of ignition and the effects on the human body.
- any polymer having the surface resistance value as described above can be appropriately employed, but preferred examples include polymers such as polypyrrole-based, polyacetylene-based, polythiophene-based, and polyaniline-based polymers. can do. Among these, polypyrrole-based and polythiophene-based materials are more preferably used from the standpoint of stability.
- the object to be applied is not limited to the conductive polymer. It may be in the form of a coating composition containing pigments, organic dyes, etc. as used. As for the coating method, a normal coating method such as a paint can be adopted.
- Examples of the electrode layer of the present invention in which a conductive polymer is applied to a PET base material include Staclear-NAS (trade name) manufactured by Nagaoka Sangyo Co., Ltd. and Diclear (trade name) manufactured by Dainippon Package Co., Ltd. ) and the like can be specifically mentioned.
- Staclear-NAS trade name
- Diclear trade name
- ST Poly trade name manufactured by Achilles Corporation can be used.
- each of the electrode layers of the present invention having such a structure can be appropriately adjusted in consideration of the overall structure of the electrostatic precipitator, the applied voltage, the usage environment, etc.
- the thickness of each of the electrode layers of the present invention preferably 1 to 200 ⁇ m, more preferably 25 to 100 ⁇ m.
- the configuration of an electrostatic chuck having a structure equivalent to that of a conventional one can be appropriately adopted.
- it may be formed in a mesh shape or the like having a plurality of defective portions (openings) penetrating in the thickness direction of the electrode layer within a predetermined region.
- the cutout portion may be circular or polygonal.
- the shape of the first electrode layer 7 disposed on the upper portion has a plurality of the defective portions (openings; reference numeral 9) as shown in FIG. It is preferable to use a mesh-shaped electrode layer, and on the other hand, to form the shape of the second electrode layer 8 arranged below the first electrode layer in a flat plate shape. At least, by combining the shapes of the first electrode layer and the second electrode layer in such a manner, it is possible to moderately increase the electric field leakage from the second electrode layer, which is preferable. In this case, it is more preferable that the first electrode layer is formed such that the area ratio of the defective portion is 10% to 20% of the entire area of the first electrode layer.
- each cutout is preferably ⁇ 7, for example, and is arranged and formed uniformly within a predetermined region, and is formed so as not to hinder the energization of the first electrode layer. It is desirable that
- the total area of the first electrode layer including the missing portion is larger than the area of the second electrode layer when viewed from above, that is, , the first electrode layer preferably has a size (area) that can cover the second electrode layer.
- the first electrode layer preferably has a size (area) that can cover the second electrode layer.
- it is effective to increase the dust collection area, and it is desirable that the dimensional difference is minimal.
- it is more preferable to be formed so as to be 2 mm larger, it may be in the range of 4.2 to 6.2 mm in consideration of assembly accuracy.
- the dust and foreign matter present around the outer peripheral portion of the first electrode is collected to the central portion while ensuring the maximum dust collection area in the narrow mold, and at the same time, the dust and foreign matter is removed from the first electrode. It is preferable because it stays in the electrode of As for "at the extreme end” described here, when it is assumed that the central portions (for example, the center or the center of gravity) of the first electrode layer and the second electrode layer are stacked, in a top view , means that the gap on one side (arbitrary end) caused by the difference in outer dimensions is within the above numerical range. For example, in the case of rectangles and squares, it refers to the gaps that occur on each side when the centers overlap. Although they may be different, the meaning is the same, and it is preferable that at least the difference between the ends be the above numerical values.
- first electrode layer and the second electrode layer in the present invention for example, voltages having different polarities are applied to each other, or one electrode is grounded and a positive or negative voltage is applied to the remaining electrodes. etc., to generate a potential difference with each other. In that case, it is preferable to appropriately adjust according to the object to be collected.
- the insulating layer used in the present invention has at least a first insulating layer 3, a second insulating layer 4, and a third insulating layer 5, as shown in FIG.
- materials for the insulating layers other than the second insulating layer 4 for example, one or more resins selected from polyimide, polyamideimide, polyester, polyethylene terephthalate, epoxy, and acrylic resin are used.
- polyimide is preferably used from the viewpoint of insulating properties, chemical resistance, and the like.
- a resin film is preferably used, and examples thereof include Kapton (trade name, manufactured by DuPont Toray) and Upilex (trade name, manufactured by Ube Industries, Ltd.), and Kapton made of polyimide is more preferable. be.
- the term "substrate” refers to the polyimide film itself, and does not include a layer for adhesion when, for example, a plurality of films are laminated as described later.
- the electrostatic precipitator of the present invention is attached to a press die and used, so the generation of particles by punching the press and the drawing of particles by the release of the press continue repeatedly and continuously, and the dust collection continues while the press die is in operation. Therefore, it is necessary to design the product so that it can be used under voltage for a long time.
- a high safety factor for at least the second insulating layer it is preferable to set a high safety factor for at least the second insulating layer, and it is more preferable to design the material and thickness so that the safety factor is 4 or more at a withstand voltage of about 30 kV. It is preferred and therefore important to use a polyimide film having a substrate thickness as described above. Here, with respect to the thickness of the base material of 75 ⁇ m, one film of 75 ⁇ m may be used. It is preferable to use three sheets of polyimide having a base material thickness of 75 ⁇ m in total.
- the structure of the third insulating layer 5 may be the same as that of the first insulating layer 3, or may be appropriately set according to the applied voltage, the power supply method, the adhesion fixing layer 6, the adhesive material during assembly, and the like. It is possible, and preferably, from the viewpoint of a countermeasure against current flow to the mold, it is appropriately selected so that the total withstand voltage of the adhesion fixing layer 6 to the third insulating layer 5 is 10 kV or more, which is a safety factor of 5. It's good.
- the adhesion fixing layer 6 is a layer in contact with an installation location such as a mold.
- the electrostatic precipitator in the present invention is more preferably a neodymium magnet sheet with a strong magnetic force for the purpose of mounting in a narrow gap. Since the adhesion fixing layer 6 plays a role of connecting an electric field between the second electrode layer 8 and the mold, adhesion is important.
- the thickness of the adhesion fixing layer 6 can be appropriately set within a range that does not impair the object of the present invention. Even if the mold is not made of magnetic metal, it is preferable to make it adhere to the mold. In that case, the material and structure of the adhesion fixing layer can be appropriately changed according to the material of the mold so as to ensure the adhesion.
- the dust collection layer 2 is a layer that is in direct contact with dust and foreign matter to be collected, and plays a role of assisting in holding the dust and foreign matter attracted by electrostatic force.
- a silicone resin sheet is preferably used.
- an adhesive means such as an adhesive tape may be separately provided together with the silicone resin sheet.
- a supporting substrate made of resin such as PET resin may be provided together with a silicone resin sheet, an adhesive tape, or the like.
- the thickness of the dust collection layer 2 is preferably about 0.1 to 0.2 mm.
- the electrode layer, the insulating layer, the adhesion fixing layer, and the dust collecting layer which have been used so far, these are laminated to form the laminated sheet 1 as shown in FIG. It is necessary to sandwich the electrode layers between the insulating layers so that the electrode layers are not exposed. As a specific method, there is a method of sandwiching the electrodes between the insulating layers and then applying heat and pressure to fuse them. Alternatively, they may be adhered using a bonding sheet, an adhesive, or an adhesive as necessary.
- the resin material such as PET used for the first electrode layer 7 and the second electrode layer 8 has a low heat resistance temperature. .
- the above-mentioned materials are laminated to form a flat plate as shown in FIG. 1, for example.
- the overall shape may be changed and processed as appropriate to suit the purpose.
- it may be a flat plate shape with an overall thickness of about 1 mm to 5 mm, or a curved or three-dimensional shape that matches the shape of the die. is preferred.
- a power supply device is required to apply voltage to the electrode layers to generate electrostatic force.
- the power supply device can be connected to the electrodes of the laminated sheet through connection terminals and switches (both not shown), and can be the same as those commonly used. Anything that can generate The potential difference to be generated can be about 1 kV to 7 kV, and if necessary, a booster circuit (high voltage generation circuit) capable of boosting up to a required voltage may be provided. Separate power sources for generating positive voltage and negative voltage may be used together.
- the electric dust collector of the present invention is provided with the laminated sheet 1 and the power supply device as described above. If necessary, the electrostatic precipitator of the present invention may be provided with a sensor, a static elimination circuit, a cleaning mechanism, or the like. Modifications, additions, and the like may be made.
- the electrostatic precipitator of the present invention is used together with a press die device, and collects dust and foreign matter such as dust generated by, for example, rubbing between a punched workpiece and a die during press working with a press die.
- dust can be collected, it is preferable to appropriately adjust the voltage (potential difference) applied to the electrode layer so that the dust collecting layer 2 more reliably adsorbs and retains dust and foreign matter.
- the distance (attraction) In addition, depending on the electric charge and volume resistivity of the dust particles, even if the dust particles are once attracted to the dust collection layer, they will be charged by exchanging charges with the dust collection layer (electrostatic precipitator side). It was confirmed that the particles were repelled without being adsorbed or held by the dust collection layer due to changes in the kinetic energy due to excessive Coulomb force, etc.
- the electrostatic precipitator of the present invention is used by attaching it to a gap in the vicinity of the place where dust particles are generated (dust-generating part), it is sufficient to have a pulling distance of at least 50 mm, and the first electrode layer described above is used.
- the applied voltage of is preferably adjusted to -4 kV or more, and from the relationship between safety and withstand voltage, the first electrode layer and the second electrode layer is preferably adjusted so that the potential difference between is low.
- a negative voltage is applied to the first electrode layer, and a negative voltage is applied to the second electrode layer.
- the electrostatic precipitator of the present invention is preferably installed directly or in the vicinity of the press mold used, preferably via the above-mentioned adhesion fixing layer as illustrated in FIG. It is preferably installed directly in the mold. More preferably, the press die has a concave structure at a position of 4 mm to 5 mm from the lower end of the mold, and the electrostatic precipitator is installed in the concave structure from the viewpoint of collecting scattered cutting dust. As for the installation position, etc., it is possible to appropriately select and adjust within a range that does not impair the object of the present invention. As for press dies, all press dies and devices using them that are used in the industry can be targeted. The same applies to the mold material.
- a pseudo-space modeled on A potential of -6 kV for the first electrode layer 7 and a potential of 1 kV for the second electrode layer 8 are input values, and as shown in FIG.
- the charging distance of -2 kV was used as an index, which is a value close to the actual attracting distance.
- No. 1 to No. No. 3 satisfies 50 mm that fills the inside of the mold space. 4 was not achieved.
- each material having a shape as shown in FIG. 1 was used, and laminated in order from the upper layer using a laminator. Adhesion of each layer was made to adhere using the silicone system adhesive of the polyimide film adhesive tape.
- a PET film 0.1 mm thick (total thickness 0.2 mm) coated with a silicone resin 0.1 mm thick was formed into a square with a side of 50 mm. I used clippings.
- the first insulating layer 3 is made of a polyimide adhesive tape (trade name: 760H #25, manufactured by Teraoka Seisakusho Co., Ltd.) having a base thickness of 0.025 mm. ) was cut into a square of 50 mm on each side and laminated.
- the material of the first electrode layer 7 is a 0.050 mm thick film (Dai Nippon Co., Ltd.), which is a PET base material coated with a conductive paint using a polythiophene-based conductive polymer at 1.6 ⁇ 10 4 ⁇ .
- Package Co., trade name: Diclea DC-AN10 4 ) was used.
- This film is cut into a square with a side of 40 mm, and a plurality of circles with a diameter of 7 mm are uniformly cut out to form a defective portion (opening; reference numeral 9), and the area ratio of the defective portion is the entire first electrode layer.
- a copper foil tape (not shown) was attached to the corners so as to protrude from the dust collection layer.
- the second insulating layer 4 for insulating the first electrode layer 7 and the second electrode layer 8 one piece of polyimide adhesive tape (Teraoka Seisakusho Co., Ltd., trade name: 760H #25) with a substrate thickness of 0.025 mm was used. and two polyimide adhesive tapes (trade name: 1030E, manufactured by Okamoto Co., Ltd.) were laminated in three sheets in advance to form a polyimide film having a total thickness of 0.075 mm.
- a PET base material was coated with a conductive paint using a polythiophene-based conductive polymer at 10 4 ⁇ to a thickness of 0.050 mm.
- the area of the second electrode layer 8 is 400 mm 2 , which is smaller than the total area (900 mm 2 ) of the first electrode layer 7 including the missing portion, and is 5 mm inside each side of the first electrode layer 7 .
- a copper foil tape (not shown) was attached to the corners so as to protrude from the dust collection layer.
- a polyimide adhesive tape (trade name: 760H #25, manufactured by Teraoka Seisakusho Co., Ltd.) having a substrate thickness of 0.025 mm was used for the third insulating layer 5 for insulating the second electrode layer 8 and the adhesion fixing layer 6. and one sheet of polyimide adhesive tape (trade name: 1030E, manufactured by Okamoto Co., Ltd.) were superimposed on each other.
- a neodymium magnet sheet having a thickness of 0.6 mm manufactured by Niroku Seisakusho Co., Ltd. under the trade name of RSN09 was used for the adhesion fixing layer 6 . These were laminated to form a laminated sheet 1, which was cut into a square with a side of 50 mm so as to be 5 mm outside each side of the first electrode layer 7. As shown in FIG.
- a power supply for applying voltage to the laminated sheet 1 produced was prepared as follows. First, a withstand voltage cable with a connector (manufactured by Nissei Electric Co., Ltd., product name: RSU-DC10KV-22) is soldered to a copper foil tape (not shown), and the copper foil tape is attached to the corners of the electrodes. It was attached to tape (not shown) and insulated with insulating tape. Next, the connector portion is connected to the first electrode layer of a power supply device [a power supply device consisting of a DC high voltage generator and a power supply cable of 100 VAC power supply] (not shown) to the negative electrode and the second electrode layer to the positive electrode, respectively. Then, it was used as an electrostatic precipitator for testing to be used in subsequent tests.
- a power supply device a power supply device consisting of a DC high voltage generator and a power supply cable of 100 VAC power supply
- SYMBOLS 1... Laminated sheet (electrostatic precipitator), 2... Dust collecting layer, 3... First insulating layer, 4... Second insulating layer, 5... Third insulating layer, 6... Adhesion fixing layer, 7... First layer Electrode layer 8 Second electrode layer 9 Defect (opening) 10 Mold 11 Copper wire 12 Aluminum piece 13 Scale
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Abstract
Description
しかしながら、マグネットの適用効果は対象が磁性体に限られるので、非磁性金属やその他の材質を対象とした塵異物に対しては効果が無い。一方でプレス機の性質上、粉塵が最も発生する打ち抜きの瞬間は金型が密閉状態であり、尚且つ金型解放時は負圧であるため、このような場合エアーによる吸引は期待できず、エアーによる吸引では集塵効果は低い。
それゆえ、従来の静電チャックの構成をそのまま電気集塵機としてプレス金型装置に使用することは考えられていなかった。
〔1〕プレス金型と共に用いられ、プレス加工の際に発生する塵異物を静電気力で集塵するプレス金型用の電気集塵機であって、
塵異物を接触させて保持する集塵層と、第1の電極層と、第2の電極層と、絶縁層と、使用される金型に設置及び固定するための密着固定層とが積層されてなる積層シートと、
前記第1及び第2の電極層間に電圧を印加する電源装置とを備え、
絶縁層は、少なくとも、集塵層と第1の電極とを絶縁する第一の絶縁層と、第1の電極層と第2の電極層とを絶縁する第二の絶縁層と、第2の電極層と密着固定層とを絶縁する第三の絶縁層とを有し、
前記第1及び第2の電極層は、ポリエチレンテレフタラート(PET)基材に導電性ポリマーが塗布されて表面抵抗率が104~105Ωのフィルムであり、
前記第二の絶縁層には基材厚さが75μmのポリイミドフィルムを用いることを特徴とするプレス金型用電気集塵機。
〔2〕第1の電極層は、当該電極層の厚み方向に貫通する複数の欠損部を有し、当該欠損部の面積比率が、第1の電極層全体の面積に対して10%~20%であると共に、上面視において前記欠損部を含めた第1の電極層が第2の電極層よりも端部において4.2~6.2mm大きく、
また、第1及び第2の電極層は、積層シートの厚み方向に対して、第二の絶縁層を介して積層されていることを特徴とする〔1〕に記載のプレス金型用電気集塵機。
〔3〕使用時には、第1の電極層にはマイナスの電圧が印加されると共に、第2の電極層にはプラス電圧が印加されて用いられ、
第1の電極層に印加する電圧を4~5キロボルト(kV)とし、第2の電極層に印加する電圧を2キロボルト(kV)とすることを特徴とする〔1〕又は〔2〕の記載のプレス金型用電気集塵機。
〔4〕密着固定層が、ネオジムマグネットシートを含むことを特徴とする〔1〕~〔3〕のいずれかに記載のプレス金型用電気集塵機。
〔5〕集塵層には、シリコーン樹脂シートが用いられること特徴とする〔1〕~〔4〕のいずれかに記載のプレス金型用電気集塵機。
〔6〕〔1〕~〔5〕のいずれかに記載のプレス金型用電気集塵機を用いることを特徴とするプレス金型。
本発明のプレス金型用電気集塵機は、図1に示されるように、少なくとも、集塵層2と、第1の電極層7と、第2の電極層8と、絶縁層3~5と、使用される金型に設置及び固定するための密着固定層6とが積層されてなる積層シート1を備える(なお、積層シート1を電気集塵機と区別しないで記載する場合がある)。絶縁層は、同図のとおり、少なくとも、集塵層と第1の電極層とを絶縁する第一の絶縁層3と、第1の電極層と第2の電極層とを絶縁する第二の絶縁層4と、第2の電極層と密着固定層とを絶縁する第三の絶縁層5とを有する。さらには、第1の電極層と第2の電極層との間に電圧を印加する電源装置(図示外)とを備える。
本発明において使用される電極層は、前記のとおり、少なくとも、第1の電極層7と、第2の電極層8とを備え、好適にはそれらを、積層シートの厚み方向に対して、絶縁層(第二の絶縁層)を介して積層させた構造を採ることがよい。このような積層構造を採ることにより、従来の電気集塵機とは異なり、集塵構造の集積化ができ、厚みを低減できる点で有利である。そして、本発明の電極層としては、支持基材としてのポリエチレンテレフタラート(PET)基材に導電性ポリマーが塗布されて、表面抵抗率が104~105Ω、好ましくは104Ωであるフィルムを用いる。このような表面抵抗率を有するようにすることで、電流量が抑えられ、絶縁層(コンデンサ)への蓄電が大幅に減少する。また、絶縁層の破損などによって絶縁が損なわれたような場合であっても蓄電されたエネルギーが破損部に流れ込む際に抵抗である電極層表面を通ることになるため大幅に電気エネルギーを低下させることができ、引火のリスクや人体への影響などを抑えることが可能である。
本発明で使用される絶縁層としては、図1等に示すとおり、少なくとも、所定の第一の絶縁層3と、第二の絶縁層4と、第三の絶縁層5とを有するが、第二の絶縁層4以外の絶縁層の材料としては、例えば、ポリイミド、ポリアミドイミド、ポリエステル、ポリエチレンテレフタラート、エポキシ、及びアクリル樹脂から選ばれた1種又は2種以上の樹脂が用いられる。このうち、絶縁特性や化学的耐性などの観点から、好ましくはポリイミドを用いることがよい。具体的には、樹脂フィルムを用いることがよく、例えば、カプトン(東レ・デュポン社製商品名)、ユーピレックス(宇部興産社製商品名)などを挙げることができ、より好ましくはポリイミドからなるカプトンである。
なぜなら、本発明の電気集塵機はプレス金型に取り付けて使用するため、プレス打ち抜きによるパーティクルの発生、開放によるパーティクルの引き込みが繰り返し連続で続くことになり、プレス金型稼働中は常に集塵を続けることで最大の効果を発揮することから、長時間電圧を掛けて使用される設計が必要となり、また製品毎に異なる金型形状に沿った形状に曲げて使用するために外的なストレスが不確定な要素となるために、少なくとも当該第二の絶縁層については安全率を高く設定することが好ましく、耐電圧約30kVで安全率4以上となるように材料や厚みが設計されることがより好ましく、それゆえ上記のとおりの基材厚みを有するポリイミドフィルムを用いることが重要となる。ここで、当該75μmの基材厚みについては、75μmで一枚のフィルムでもよく、好ましくは、柔軟性と耐屈曲性などの観点から、それよりも薄い厚みのフィルムを複数枚、例えば、25μmの基材厚みのポリイミドを3枚用いて合計75μmとすることがよい。
本発明において、当該密着固定層6は、金型などの設置場所に接する層となるが、とくに金型に直接設置する場合には、金型の素材には磁性金属が使用されることから、この磁性金属への密着性の確保のために密着固定層としてマグネットシートを使用した層とすることが好ましく、本発明における電気集塵機は狭い隙間に取り付ける目的から磁力の強いネオジムマグネットシートがより好ましい。当該密着固定層6は、第2の電極層8と金型との間で電界を繋ぐ役割を担うこととなるため、密着が重要となる。これにより、側面方向への電気力線の発生が増加することや、電気力線が短くなることで電界強度が増加することが期待され、上方に対してより強い電界を発生させることができる(一例として、図3を参照)。仮に密着が不十分である場合、集塵性能が損なわれる場合がある。密着固定層6の厚みは本発明の目的を損なわない範囲で適宜設定可能である。金型が磁性金属ではない場合も金型に密着させることが好ましく、その場合には密着性を確保できるように金型の素材に合わせて密着固定層の材料や構成を適宜変更可能である。
本発明において、当該集塵層2は、集塵対象となる塵異物が直に接する層であって、静電気力によって引き付けた塵異物の保持を補助する役割を担うものである。このような集塵層2としては、好ましくはシリコーン樹脂シートが用いられることがよく、詳細原理は定かではないが、塵異物との間に分子間力の発生を期待できるとともに、メンテナンス性が良いため好ましい。或いは、金型昇降に伴う風圧などによって塵異物が再飛散することなどを防止する観点から、より好ましくは、シリコーン樹脂シートとともに粘着テープなどの粘着手段を別途設けてもよい。さらに、シリコーン樹脂シートや粘着テープなどとともに、PET樹脂などの樹脂製の支持基材を設けてもよい。集塵層2の厚みは0.1~0.2mm程度とすることが好ましい。
そして、これまでのような電極層、絶縁層、密着固定層及び集塵層を少なくとも用いて、これらを積層して、図1のような積層シート1とする。電極層が露出しないように各絶縁層に挟み込む必要があり、具体的な方法としては、絶縁層の間に電極を挟み込んだ後に、熱と圧力を加えて融着させる方法がある。もしくは、必要に応じてボンディングシートや接着剤もしくは粘着剤を用いて接着させてもよい。好ましくは、第1の電極層7と、第2の電極層8に使用するPET等の樹脂材料の耐熱温度が低いことなどの理由から、シリコーン系などの接着剤を用いて積層させることがよい。
前記のように積層シート1を形成した後には、電極層に電圧を印加して静電気力を発生させるための電源装置が必要となる。電源装置は前記積層シートの電極と接続端子およびスイッチ(いずれも図示外)を介して接続させることができて、一般的に使用されるものと同様なものを用いることができ、直流の高電圧を発生できるものであればよい。発生させる電位差は1kV~7kV程度とすることができ、必要に応じて、必要な電圧まで昇圧させることができる昇圧回路(高電圧発生回路)を備えるようにしてもよい。プラス電圧とマイナス電圧を発生させる個別の電源を併用してもよい。
上述のとおり、本発明の電気集塵機はプレス金型の装置と共に用いられ、プレス金型によるプレス加工の際に、例えば打ち抜かれたワークと金型の擦れ等によって発生する粉塵などの塵異物を集塵できるものであるが、前記の集塵層2において塵異物がより確実に吸着・保持されるためには、前記の電極層に印加する電圧(電位差)を適宜調整することが好ましい。なぜなら、後述の実施例のとおり、本発明者らの推測によれば、電極層に印加する電圧(電位差)に応じて塵異物を集塵層(電気集塵機側)まで引き寄せることができる距離(引き寄せ距離)が概ね定まり、また、塵異物が持つ電荷や体積抵抗率によっては、塵異物が一旦は集塵層まで引き寄せられたとしても、集塵層(電気集塵機側)との電荷のやり取りによる帯電の変化や過剰なクーロン力による運動エネルギー等に起因して、集塵層に吸着・保持されずに弾かれてしまう現象が確認された。それに加えて、本発明の電気集塵機においては塵異物の発生場所(発塵部)近傍の隙間に取り付ける使用方法であることから、少なくとも50mmの引き寄せ距離があればよく、前記の第1の電極層の印加電圧は後述の表3からも把握されるとおり-4kV以上になるように調整されることが好ましく、安全性及び耐電圧の関係から前記の第1の電極層と第2の電極層との電位差が低くなるように調整されることが好ましく、前記の塵異物の弾かれ等の問題を考慮すると、第1の電極層においてはマイナスの電圧が印加されると共に、第2の電極層にはプラスの電圧が印加されることが好ましく、より好ましくは第1の電極層には-4kV~-5kVの電圧が印加されると共に、第2の電極層には+2kVの電圧が印加されることが良いことが知見された。
(1)第1の電極層の欠損率と引寄距離のCAE解析
第1の電極層の形状最適化を行う為、電気集塵機の集塵層から垂線上の電位とその距離をCAE解析ソフト(ムラタソフトウェア社、製品名:FEMTET)を用いて電場解析を行い、挙動時の空間電位を数値化した。
図1に示すような四角板状の積層モデルを図5のようなプレス金型の下型端部から5mmの位置の凹部に設置し、下型と上型間の金型空間内50mmを空気と模した疑似空間をモデルとした。第1の電極層7に電位-6kV、第2の電極層8に電位1kVを入力値とし、図2に示すように第1の電極層モデルの欠損部(開口部;符号9)を欠損率として、実際の引寄距離と近い数値として-2kVの帯電距離を指標として、表1に記載のとおり実施した。
結果は表1に示すように、No.1~No.3は金型空間内を満たす50mmを満足する一方、No.4は未達であった。
第1の電極層の形状最適化を行う為、電気集塵機の集塵層から垂線上の電位とその距離をCAE解析ソフト(ムラタソフトウェア社、製品名:FEMTET)を用いて電場解析を行い、挙動時の空間電位を数値化した。
図1に示すような四角板状の積層モデルを図5のようなプレス金型の下型端部から5mmの位置の凹部に設置し、50mm大気と模した疑似空間をモデルとした。第1の電極層7に電位-6kV、第2の電極層8に電位1kVを入力値とし、図2に示すように第1の電極層モデルから第2の電極層モデルの最端同士の距離を片側端部差として、実際の引寄距離と近い数値として―2kVの帯電距離を指標として、表2に記載のとおり実施した。
結果は表2に示すように、No.1~No.3は金型空間内を満たす50mmを満足する一方、No.4~No.6は未達であった。
先ず、図1に示されるような形状を有する各材料を用いて、上の層から順にラミネーターで積層して作製した。各層の接着は、ポリイミドフィルム粘着テープのシリコーン系粘着剤を用いて接着させた。
集塵層2には、シリコーン樹脂0.1mm厚み(株式会社クリエイティブテクノロジー製、製品名:Ionpad)が塗工されたPETフィルム0.1mm厚み(総厚み0.2mm)を1辺50mmの正方形に切り抜き用いた。
集塵層2と第1の電極層7との絶縁性を確保するため、第一の絶縁層3としては0.025mmの基材厚みのポリイミド粘着テープ(寺岡製作所社、商品名:760H #25)を1辺50mmの正方形に切り抜き積層した。
第1の電極層7の素材には、PET基材に、ポリチオフェン系導電性高分子を用いた導電性塗料が1.6×104Ωにてコーティングされた0.050mm厚みのフィルム(大日本パックェージ社、商品名:ダイクレアDC-AN104)を用いた。このフィルムを1辺40mmの正方形に切り抜きして、直径が7mmの円を複数個均一にくり抜いて欠損部(開口部;符号9)を設け、欠損部の面積割合が当該第1の電極層全体の面積に対して約12%(表1、No. 2)となるように加工し、これを第1の電極層7とし、集塵層各辺から5mm内側に張り付けた。また、角部に銅箔テープ(図示外)を貼り集塵層からはみ出すように張り付けた。
第1の電極層7と第2の電極層8とを絶縁する第二の絶縁層4としては、基材厚み0.025mmのポリイミド粘着テープ(寺岡製作所社、商品名:760H #25)1枚とポリイミド粘着テープ(オカモト社、商品名:1030E)2枚を予め3枚に積層してなる基材合計0.075mm厚みのポリイミドフィルムを用いた。
第2の電極層8には、前記第1の電極層7と同様に、PET基材に、ポリチオフェン系導電性高分子を用いた導電性塗料が104Ωにてコーティングされた0.050mm厚みのフィルム(大日本パックェージ社、商品名:ダイクレア)を30mmの正方形に切り抜き加工し第2の電極層8とした。この第2の電極層8の面積は400mm2であり、上記第1の電極層7の欠損部を含めた全面積(900mm2)よりも小さく、第1の電極層7の各辺より5mm内側になるよう配置した。また、角部に銅箔テープ(図示外)を貼り集塵層からはみ出すように張り付けた。
第2の電極層8と密着固定層6とを絶縁するための第三の絶縁層5には、基材厚み0.025mmのポリイミド粘着テープ(寺岡製作所社、商品名:760H #25)1枚とポリイミド粘着テープ(オカモト社、商品名:1030E)1枚を重ねて用いた。
密着固定層6にはネオジムマグネットシート0.6mm厚み(二六製作所社製商品名RSN09)を用いた。
これらを積層させて積層シート1とし、1辺50mmの正方形として第1の電極層7の各辺より5mm外側になるよう切り抜いた。
(1)電圧印加と引き寄せ距離の評価
図4に示すように、床面に対して積層シート1部分が垂直になるように立てた電気集塵機の第1の電極層及び第2の電極層にそれぞれ表3に記載のとおりの電圧を印加した。
次いで、電気集塵機の集塵層2側に間隔(引寄距離)をあけてアルミ片12(10mm×1mm程度)を、極細の銅線11を用いて吊り下げたサンプルを、電気集塵機で集塵されるかどうかを評価した。引き寄せ距離は下部に設置した金属製のスケール13を用いて目視で計測した。
結果は表3に示すように、No.1~No.4の電圧印加(電位差)では、アルミ片が集塵層に引き寄せられるものの弾かれてしまうことが分かった。一方で、No.5~No.6の場合にはアルミ片が積層シート1の集塵層部分に集塵されて吸着されたままであった。
上記の試験用の電気集塵機を、プレス金型(下型における材料切断鋼材付近の場所)に設置して、アルミ材料をワークとして用いて切断加工した際に発生する塵異物であるアルミ片(不定形だが、おおよその直径0.1mm~2.0mm程度)の集塵の効果を評価した。模式図を図5に示す。
Claims (6)
- プレス金型と共に用いられ、プレス加工の際に発生する塵異物を静電気力で集塵するプレス金型用の電気集塵機であって、
塵異物を接触させて保持する集塵層と、第1の電極層と、第2の電極層と、絶縁層と、使用される金型に設置及び固定するための密着固定層とが積層されてなる積層シートと、
前記第1及び第2の電極層間に電圧を印加する電源装置とを備え、
絶縁層は、少なくとも、集塵層と第1の電極とを絶縁する第一の絶縁層と、第1の電極層と第2の電極層とを絶縁する第二の絶縁層と、第2の電極層と密着固定層とを絶縁する第三の絶縁層とを有し、
前記第1及び第2の電極層は、ポリエチレンテレフタラート(PET)基材に導電性ポリマーが塗布されて表面抵抗率が104~105Ωのフィルムであり、
前記第二の絶縁層には基材厚さが75μmのポリイミドフィルムを用いることを特徴とするプレス金型用電気集塵機。 - 第1の電極層は、当該電極層の厚み方向に貫通する複数の欠損部を有し、当該欠損部の面積比率が、第1の電極層全体の面積に対して10%~20%であると共に、上面視において前記欠損部を含めた第1の電極層が第2の電極層よりも端部において4.2~6.2mm大きく、
また、第1及び第2の電極層は、積層シートの厚み方向に対して、第二の絶縁層を介して積層されていることを特徴とする請求項1に記載のプレス金型用電気集塵機。 - 使用時には、第1の電極層にはマイナスの電圧が印加されると共に、第2の電極層にはプラス電圧が印加されて用いられ、
第1の電極層に印加する電圧を4~5キロボルト(kV)とし、第2の電極層に印加する電圧を2キロボルト(kV)とすることを特徴とする請求項1又は2の記載のプレス金型用電気集塵機。 - 密着固定層が、ネオジムマグネットシートを含むことを特徴とする請求項1~3のいずれかに記載のプレス金型用電気集塵機。
- 集塵層には、シリコーン樹脂シートが用いられること特徴とする請求項1~4のいずれかに記載のプレス金型用電気集塵機。
- 請求項1~5のいずれかに記載のプレス金型用電気集塵機を用いることを特徴とするプレス金型。
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JP2004291012A (ja) | 2003-03-26 | 2004-10-21 | Shibaura Mechatronics Corp | プレス装置 |
WO2005091356A1 (ja) | 2004-03-19 | 2005-09-29 | Creative Technology Corporation | 双極型静電チャック |
WO2007066572A1 (ja) | 2005-12-06 | 2007-06-14 | Creative Technology Corporation | 静電チャック用電極シート及び静電チャック |
JP2010075864A (ja) * | 2008-09-26 | 2010-04-08 | Panasonic Corp | 電気集塵機 |
WO2015029698A1 (ja) | 2013-09-02 | 2015-03-05 | 株式会社クリエイティブ テクノロジー | パーティクルコレクタシステム及び集塵方法 |
WO2022064977A1 (ja) * | 2020-09-24 | 2022-03-31 | 株式会社クリエイティブテクノロジー | 集塵機及び集塵方法 |
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JP2004291012A (ja) | 2003-03-26 | 2004-10-21 | Shibaura Mechatronics Corp | プレス装置 |
WO2005091356A1 (ja) | 2004-03-19 | 2005-09-29 | Creative Technology Corporation | 双極型静電チャック |
WO2007066572A1 (ja) | 2005-12-06 | 2007-06-14 | Creative Technology Corporation | 静電チャック用電極シート及び静電チャック |
JP2010075864A (ja) * | 2008-09-26 | 2010-04-08 | Panasonic Corp | 電気集塵機 |
WO2015029698A1 (ja) | 2013-09-02 | 2015-03-05 | 株式会社クリエイティブ テクノロジー | パーティクルコレクタシステム及び集塵方法 |
WO2022064977A1 (ja) * | 2020-09-24 | 2022-03-31 | 株式会社クリエイティブテクノロジー | 集塵機及び集塵方法 |
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