WO2009154307A1 - 通気フィルター及びその製造方法 - Google Patents
通気フィルター及びその製造方法 Download PDFInfo
- Publication number
- WO2009154307A1 WO2009154307A1 PCT/JP2009/061664 JP2009061664W WO2009154307A1 WO 2009154307 A1 WO2009154307 A1 WO 2009154307A1 JP 2009061664 W JP2009061664 W JP 2009061664W WO 2009154307 A1 WO2009154307 A1 WO 2009154307A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- adhesive layer
- gas permeable
- permeable membrane
- ventilation
- film
- Prior art date
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 17
- 238000000034 method Methods 0.000 title description 16
- 239000012528 membrane Substances 0.000 claims description 92
- 239000012790 adhesive layer Substances 0.000 claims description 61
- 238000009423 ventilation Methods 0.000 claims description 55
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 30
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 30
- -1 polytetrafluoroethylene Polymers 0.000 claims description 26
- 230000002093 peripheral effect Effects 0.000 claims description 20
- 239000002390 adhesive tape Substances 0.000 claims description 19
- 239000005871 repellent Substances 0.000 claims description 14
- 230000002940 repellent Effects 0.000 claims description 12
- 239000007788 liquid Substances 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 78
- 229920000642 polymer Polymers 0.000 description 15
- 239000000463 material Substances 0.000 description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 239000003921 oil Substances 0.000 description 9
- 239000011148 porous material Substances 0.000 description 9
- 239000006260 foam Substances 0.000 description 7
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 5
- 239000004698 Polyethylene Substances 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 229910052731 fluorine Inorganic materials 0.000 description 5
- 239000011737 fluorine Substances 0.000 description 5
- 229920000573 polyethylene Polymers 0.000 description 5
- 229920000139 polyethylene terephthalate Polymers 0.000 description 5
- 239000005020 polyethylene terephthalate Substances 0.000 description 5
- 239000004743 Polypropylene Substances 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 4
- 239000004745 nonwoven fabric Substances 0.000 description 4
- 229920001155 polypropylene Polymers 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- 239000004820 Pressure-sensitive adhesive Substances 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 2
- 239000004642 Polyimide Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
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- 238000010438 heat treatment Methods 0.000 description 2
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- 238000000465 moulding Methods 0.000 description 2
- 229920001778 nylon Polymers 0.000 description 2
- 238000009832 plasma treatment Methods 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 229920001721 polyimide Polymers 0.000 description 2
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- 239000011347 resin Substances 0.000 description 2
- 239000004094 surface-active agent Substances 0.000 description 2
- 229920005992 thermoplastic resin Polymers 0.000 description 2
- 238000013022 venting Methods 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
- 240000004050 Pentaglottis sempervirens Species 0.000 description 1
- 235000004522 Pentaglottis sempervirens Nutrition 0.000 description 1
- 229920002873 Polyethylenimine Polymers 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 229920002323 Silicone foam Polymers 0.000 description 1
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Natural products C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 239000003522 acrylic cement Substances 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 235000013361 beverage Nutrition 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
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- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 239000012442 inert solvent Substances 0.000 description 1
- 239000010721 machine oil Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 239000004530 micro-emulsion Substances 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- RVZRBWKZFJCCIB-UHFFFAOYSA-N perfluorotributylamine Chemical compound FC(F)(F)C(F)(F)C(F)(F)C(F)(F)N(C(F)(F)C(F)(F)C(F)(F)C(F)(F)F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)F RVZRBWKZFJCCIB-UHFFFAOYSA-N 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 229920001707 polybutylene terephthalate Polymers 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 229920000193 polymethacrylate Polymers 0.000 description 1
- 229920000306 polymethylpentene Polymers 0.000 description 1
- 239000011116 polymethylpentene Substances 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000012744 reinforcing agent Substances 0.000 description 1
- 230000001846 repelling effect Effects 0.000 description 1
- 238000007650 screen-printing Methods 0.000 description 1
- 239000013514 silicone foam Substances 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/14—Other self-supporting filtering material ; Other filtering material
- B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/54—Particle separators, e.g. dust precipitators, using ultra-fine filter sheets or diaphragms
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/14—Other self-supporting filtering material ; Other filtering material
- B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
- B01D39/1692—Other shaped material, e.g. perforated or porous sheets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
- B01D63/08—Flat membrane modules
- B01D63/087—Single membrane modules
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
- B01D65/003—Membrane bonding or sealing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/30—Polyalkenyl halides
- B01D71/32—Polyalkenyl halides containing fluorine atoms
- B01D71/36—Polytetrafluoroethene
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/18—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/04—Additives and treatments of the filtering material
- B01D2239/0414—Surface modifiers, e.g. comprising ion exchange groups
- B01D2239/0428—Rendering the filter material hydrophobic
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2279/00—Filters adapted for separating dispersed particles from gases or vapours specially modified for specific uses
- B01D2279/35—Filters adapted for separating dispersed particles from gases or vapours specially modified for specific uses for venting arrangements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2279/00—Filters adapted for separating dispersed particles from gases or vapours specially modified for specific uses
- B01D2279/45—Filters adapted for separating dispersed particles from gases or vapours specially modified for specific uses for electronic devices, e.g. computers, hard-discs, mobile phones
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2313/00—Details relating to membrane modules or apparatus
- B01D2313/04—Specific sealing means
- B01D2313/042—Adhesives or glues
Definitions
- the present invention relates to a ventilation filter used in an electronic device that requires waterproofness and dustproofness.
- Electronic devices such as speakers used in mobile phones and electro-acoustic transducers such as Mata ichrophones, personal computer hard disk drives, automobile engine control units, digital cameras, and other electronic devices have openings for passing sound, or It has an opening for adjusting the air pressure inside the electronic device, and the entire electronic device constitutes a semi-enclosed space.
- the opening is provided with a ventilation film for the purpose of preventing intrusion of water droplets, dust, or harmful gases (Nox, Sox, oil mist, etc.).
- This breathable membrane is required to be waterproof and dustproof, as well as to play sound and adjust internal pressure (Patent Document 1).
- the ventilation function of the ventilation membrane includes not only after the completion of the above electronic devices, but also during the manufacturing process of electronic devices (for example, when venting to escape the expanded gas in the solder reflow process of electronic components). It will be used or utilized.
- Porous polytetrafluoroethylene is widely used as a material for the above-described gas permeable membrane (for example, Patent Document 2).
- Patent Document 2 Japanese Patent Document 2
- Patent Document 1 Japanese Patent Laid-Open No. 8-79 8 65 (paragraph 0 0 18, FIG. 8)
- Patent Document 2 Japanese Patent Laid-Open No. 10- 1 6 5 7 8 7 Disclosure of Invention Problems to be solved by the invention
- Patent Document 1 does not specifically describe the method of forming a gas permeable membrane or a double-sided pressure-sensitive adhesive tape, and the cutting method.
- a conventional gas permeable filter generally composed of an air-permeable membrane and an adhesive layer such as a double-sided pressure-sensitive adhesive tape is generally used. It is manufactured as follows.
- FIG. 8 is a diagram showing a normal manufacturing process of a breathable filter.
- an adhesive layer 2 having an opening 2 a is formed on a release sheet 1 made of polyethylene terephthalate (hereinafter referred to as “PET”).
- PET polyethylene terephthalate
- a porous membrane 3 made of porous polytetrafluoroethylene.
- Substrate-less double-sided adhesive tape is used to mean a double-sided adhesive tape that does not contain a base material (core material) for the purpose of reinforcement.
- an object of the present invention is to provide a structure in which a gas permeable membrane is less likely to be damaged when the gas permeable membrane is cut in a gas permeable filter including an adhesive layer and a gas permeable membrane formed in a frame shape. It is said.
- Fig. 9 shows the situation when the adhesive layer 2 has been successfully peeled off.
- the gas permeable membrane 3 is made of a resin such as porous polytetrafluoroethylene
- another problem arises. That is, since the stretched porous polytetrafluoroethylene film is likely to shrink due to the passage of time or heat, the gas-permeable membrane 3 contracts and the adhesive layer 2 is exposed as shown in FIG. 9 (d). Sometimes it becomes. If the adhesive layer 2 is exposed, there is a problem that foreign matter adheres to the adhesive layer 2 or adheres to a packing material for storing the ventilation filter as a product. Also, when removing the ventilation filter from the packaging material, The workability is also worsened.
- Patent Document 2 paragraph 0 0 0 6
- Patent Document 2 the problem of the porous polytetrafluoroethylene film is described.
- the solution is to use a net made of thermoplastic resin as a reinforcing agent on one or both sides (paragraphs 0 0 1 0).
- thermoplastic resin net attachment of the thermoplastic resin net is accompanied by an increase in process load.
- the present invention provides a structure in which, when the gas permeable membrane is made of a material that easily contracts, the adhesive layer is difficult to be exposed even if the gas permeable membrane contracts while maintaining the original characteristics or functions of the gas permeable membrane. This is the second purpose. Means for solving the problem
- a ventilation filter having an adhesive layer formed in a frame shape and a gas permeable membrane bonded to the adhesive layer, the outer peripheral portion of the gas permeable membrane being configured to be outside the outer peripheral portion of the frame-shaped adhesive layer It is what has been.
- the outer peripheral portion of the gas permeable membrane is bent with the adhesive layer side as a valley.
- the gas permeable membrane is made of a fluororesin membrane.
- the gas permeable membrane is composed of a porous polytetrafluoroethylene membrane.
- a liquid repellent is added to the surface of the gas permeable membrane.
- the adhesive layer may be a double-sided pressure-sensitive adhesive tape.
- the method for producing a ventilation filter of the present invention that can achieve the above-described object is as follows.
- An adhesive layer is formed in a frame shape on the release sheet, the adhesive layer is covered with a gas permeable film, and the gas permeable film is cut outside the outer peripheral portion of the frame-shaped adhesive layer.
- An adhesive layer was formed in a frame shape on the release sheet and formed larger than the frame-shaped adhesive layer
- the fluororesin breathable membrane covers the frame-like adhesive layer.
- the ventilation filter and the method of manufacturing the same of the present invention it is possible to provide a structure in which the ventilation film is not easily damaged in the ventilation filter composed of the adhesive layer and the ventilation film formed in a frame shape. Further, when the gas permeable membrane is made of a material that easily contracts, a structure is provided in which the adhesive layer is not easily exposed even when the gas permeable membrane contracts.
- FIGS. 1A to 1F are process sectional views of a ventilation filter according to an embodiment of the present invention.
- FIGS. 2A to 2B are process sectional views of the ventilation filter according to the embodiment of the present invention.
- FIG. 3 is a bird's-eye view of the ventilation filter according to the embodiment of the present invention.
- FIG. 4 is a photograph of the manufacturing process of the ventilation filter according to the example of the present invention.
- FIG. 5 is a photograph of the manufacturing process of the ventilation filter according to the comparative example.
- FIG. 6 is a photograph of the manufacturing process of the ventilation filter according to the comparative example.
- FIG. 7 is a photograph of the manufacturing process of the ventilation filter according to the comparative example.
- 8A to 8D are process sectional views of a conventional ventilation filter.
- FIG. 1 is a cross-sectional view of a manufacturing process for a ventilation filter according to an embodiment of the present invention.
- a PET release sheet 1 is prepared, and an adhesive layer 2 is formed on the release sheet 1.
- the adhesive layer 2 is formed in a frame shape and has an opening 2a.
- a gas permeable membrane 3 made of porous polytetrafluoroethylene (hereinafter referred to as “porous PTFE”) is bonded onto the adhesive layer 2.
- porous PTFE porous polytetrafluoroethylene
- a predetermined portion of the gas permeable membrane 3 is cut into the gas permeable membrane 3 with a die-cut roll (blade) 4 to form the gas permeable membrane 3 into a circular shape.
- the shape of the ventilation membrane 3 is determined according to the shape of the sound passage opening of the electronic device to which the ventilation filter is attached, the shape of the ventilation opening, etc., and is not limited to the circular shape. .
- the unnecessary portion 3X of the gas permeable membrane 3 located outside the gas permeable membrane 3 is removed.
- the timing at which the unnecessary portion 3 X is peeled off is not necessarily the same as the entire periphery of the gas permeable membrane 3 but also depends on the shape of the gas permeable membrane 3.
- the outer peripheral portion of the gas permeable membrane 3 is configured to be outside the outer peripheral portion of the adhesive layer 2 formed in a frame shape. It is. By configuring the positional relationship between the outer peripheral part of the adhesive layer 2 and the outer peripheral part of the gas permeable membrane 3 in this way, the adhesive layer 2 is not cut by the die-cut roll. 2 X does not occur. For this reason, when the unnecessary portion 3 X of the gas permeable membrane 3 is removed, the outer peripheral portion of the gas permeable membrane 3 is prevented from being torn off by the unnecessary portion 2 X. That is, the outer peripheral portion of the gas permeable membrane 3 is not damaged. Further, since there is no adhesive layer 2 (unnecessary part 2 x) in the unnecessary part 3 X of the air-permeable membrane 3, the unnecessary part 3 X can be removed very easily.
- the distance between the outer peripheral portion of the gas permeable membrane 3 and the outer peripheral portion of the adhesive layer 2 is preferably 0.1 mm or more. More preferably, it is 0.5 mm or more.
- Omm or less More preferably, it is 2. Omm or less.
- the ventilation filter formed as described above is stored in the form of a tool or strip with the release sheet 1 attached, and when used, the release sheet 1 is peeled off, as shown in FIG. 1 (e). As shown, it is stuck so as to close the opening 6a provided in the housing 6 of the electronic device or the like.
- the ventilation membrane 3 is made of a material that easily shrinks, the ventilation filter opening 6 As shown in Fig. 1 (f), the gas permeable membrane 3 may have shrunk more than when the gas permeable membrane 3 is cut as shown in Fig. 1 (f). Since it is configured to be outside the outer peripheral portion of the adhesive layer 2 as described above, there is a margin for some shrinkage, and exposure of the adhesive layer 2 can be prevented.
- the shrinkage rate of the gas permeable membrane 3 differs depending on the draw ratio even if the same PTFE material is used and the same film thickness is produced. Therefore, use a porous PTFE film stretched only in one axial direction, or a porous PTFE film stretched at different magnifications in two directions in the plane of the film. It is preferable to provide the above-mentioned margin in the direction with a high shrinkage rate by forming the gas permeable membrane 3 in an elliptical shape.
- One or more ventilation filters may be formed on one release sheet 1, but if the ventilation film 3 is arranged in a honeycomb shape as shown in FIG. 3, the ventilation filter can be efficiently manufactured. Can be collected. In FIG. 1 (c), the release sheet 1 is not cut even if the ventilation film 3 is cut. However, as shown in FIG. 3, the release sheet 1 and the release sheet 1 may be punched at once.
- the adhesive layer 2 and the gas permeable membrane 3 which are the basic components of the ventilation filter in the above-described embodiment of the present invention, and the release sheet 1 used in the manufacturing process of the ventilation filter will be described in more detail.
- Materials other than PET that can be selected for the release sheet 1 include, for example, polyesters such as polybutylene terephthalate, polyolefins such as polypropylene, polyethylene, and polymethylpentene, resin films such as polycarbonate, dalasin paper, fine paper, and coat Paper such as paper, impregnated paper, synthetic paper, and metal foil such as aluminum and stainless steel.
- the release sheet 1 may be coated with a conductive material as necessary, or the release sheet 1 itself may be mixed with a conductive material. This ensures that the product is charged Can be reduced.
- the thickness of the release sheet 1 is, for example, 10 to: l O O // m, preferably 25 to 50 im.
- the surface of the base material of release sheet 1 may be subjected to corona discharge treatment, plasma treatment, flame plasma treatment, etc. in order to improve the adhesion to the release agent or adhesive, and a primer layer is provided. Also good.
- the primer layer polymer materials such as polyethylene, polypropylene, styrene copolymer, polyester, polyurethane, polybutyl alcohol, polyethyleneimine, polyacrylate, polymethacrylate, and modified products thereof (so-called anchor coating agents) Can be used.
- the adhesive layer 2 is formed in a frame shape and has an opening 2a.
- the shape of the frame is not particularly limited, and may be a circle, an ellipse, a rectangle, or a polygon.
- Examples of the method for forming the adhesive layer 2 having a frame-like pattern include a screen printing method, a method of transferring the adhesive melt to the release sheet 1 with a gravure pattern roll, and cutting into a frame shape in advance. There is a method of using a double-sided adhesive tape as the adhesive layer 2.
- Double-sided adhesive tapes include nonwoven nonwoven fabric double-sided adhesive tapes made of polyethylene nonwoven fabric, polypropylene nonwoven fabric, nylon nonwoven fabric, etc., PET-based double-sided adhesive tape, polyimide-based double-sided adhesive tape, nylon-based double-sided adhesive tape, foam Body (for example, urethane foam, silicone foam, attalino foam, polyethylene foam) Various types of materials such as a base double-sided adhesive tape and a baseless double-sided adhesive tape can be used.
- Foam-based double-sided adhesive tapes or base-less double-sided adhesive tapes are difficult to completely separate because they reattach even if they are cut once with a sharp blade. Therefore, in the above-described conventional vent filter structure in which the outer diameter dimensions of the gas permeable membrane 3 and the adhesive layer 2 are the same, the breakage problem at the end of the gas permeable membrane 3 is very remarkable, and therefore the application of the present invention is more effective. It is.
- the adhesive refers to a substance generally used for bonding objects to each other, and includes what is called an adhesive.
- the constituent material of the breathable membrane 3 includes polyethylene, polypropylene, Polystyrene, polyimide, and the like can be used, but preferably a fluororesin excellent in waterproofness, more preferably porous polytetrafluoroethylene (porous
- Porous PTFE film is not only waterproof, but also has a porous structure and a small mass.For applications that allow sound to pass through, porous PTFE film prevents the ingress of water droplets, dust, harmful gases, etc. Suitable for use.
- Porous PTFE film is formed by removing the molding aid from the paste molded body obtained by mixing PTFE fine powder with the molding aid, then stretched at high temperature and high speed, and further fired as necessary. It is obtained by this.
- the nodes folded crystals
- the fibrils folded crystals are unwound by stretching and directly drawn out so as to connect the nodes).
- Chain-like molecular bundles are oriented in the stretching direction.
- the space defined between the fibrils or between the fibrils and the nodes is a fibrous structure with pores.
- the fibrils spread radially, the nodes connecting the fibrils are scattered in islands, and there are many cobweb-like fibrous structures where there are many spaces defined by fibrils and nodes. It has become.
- the gas permeable membrane 3 which is a constituent material of the gas permeable filter of the present invention may be a uniaxially stretched porous PTFE film or a biaxially stretched porous PTFE film.
- the gas permeable membrane 3 is preferably used by coating the inner surface of the pores with a liquid repellent polymer.
- liquid repellent refers to a substance having properties or functions of repelling liquid
- liquid repellent includes “water repellent”, “ It includes “oil repellent”, “water / oil repellent” and the like.
- description will be made by taking a water / oil repellent polymer as an example.
- water / oil repellent polymer a polymer having a fluorine-containing side chain can be used.
- Composite water and oil repellent polymer and porous PTFE film Details of the method are disclosed in WO 94/22928 and the like, and an example is shown below.
- n is an integer of 3 to 13, R is hydrogen or methyl group
- an aqueous microemulsion (average particle size 0.01 to 0.5 m) of the polymer is added to a fluorine-containing surfactant (eg, ammonia).
- Umperfluoroctanate is impregnated into the pores of the porous PTFE film, and then heated.
- This heating removes water and the fluorine-containing surfactant, and the polymer having fluorine-containing side chains melts to coat the inner surface of the pores of the porous PTFE film while maintaining the continuous pores.
- a breathable membrane with excellent water and oil repellency can be obtained.
- water- and oil-repellent polymers that can be used include “AF polymer” (DuPont product name) and “Cytop” (Asahi Glass product name).
- AF polymer DuPont product name
- Cytop Adhi Glass product name
- the polymer is dissolved in an inert solvent such as “Fluorinert” (trade name of Sumitomo 3EM), and the porous PTFE film is formed. After impregnation, the solvent may be removed by evaporation.
- the adhesive layer 2 is affixed to one side of the gas permeable membrane 3 .
- the adhesive layer 2 is affixed to the casing of the mobile phone, the other side of the gas permeable membrane 3 is provided.
- An adhesive layer for attaching an electroacoustic transducer such as a microphone or a speaker may be provided.
- a ventilation filter in which the following adhesive layer and a ventilation film were laminated was manufactured as a trial. [Venting membrane]
- Polytetrafluoroethylene powder (by fine powder) obtained by emulsion polymerization is mixed into 100 parts by weight and 2 parts by weight of solvent naphtha. ⁇ After heating the compact to the boiling point of the solvent naphtha to evaporate and remove the solvent naphtha, it is biaxially stretched at a rate of 10% or more per second at a temperature below the melting point of polytetrafluoroethylene A porous PTFE film having a diameter of 20 ⁇ m and a porosity of 90% was produced, and this was used as a belt-shaped gas permeable membrane having a width of 105 mm.
- Adhesive layer 2 is a double-sided adhesive tape (manufactured by Sumitomo 3EM, product number: VHB—Y 4 9 1 4, thickness: 0.25 mm) with acrylic adhesive applied to both sides of the acrylic foam substrate.
- the above-described belt-shaped gas permeable membrane was formed on the adhesive layer 2, and then a plurality of circular gas permeable membranes 3 were formed by inserting (cutting) blades of a die-cut roll into the gas permeable membrane.
- the outer diameter of each gas permeable membrane 3 was 15.4 mm, and the outer peripheral portion of the gas permeable membrane 3 was outside the outer peripheral portion of the adhesive layer 2 having an outer diameter of 15 mm.
- a test was conducted to peel off unnecessary portions of the band-shaped gas permeable membrane.
- Figure 4 shows a photograph of the situation.
- Each air-permeable membrane 3 is formed with a 2 O mm pitch (center-to-center distance). As shown in FIG. 4, unnecessary portions of the belt-shaped gas permeable membrane are peeled off without any problem without causing the gas permeable membrane 3 to be broken or deformed.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Filtering Materials (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
- Laminated Bodies (AREA)
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN200980128920.9A CN102099187B (zh) | 2008-06-20 | 2009-06-19 | 通气滤膜及其制造方法 |
KR1020117000459A KR101341227B1 (ko) | 2008-06-20 | 2009-06-19 | 통기 필터 및 그 제조 방법 |
AU2009261104A AU2009261104B2 (en) | 2008-06-20 | 2009-06-19 | Vent filter and method for manufacturing thereof |
US12/999,832 US8512428B2 (en) | 2008-06-20 | 2009-06-19 | Vent filter and method for manufacturing the same |
EP09766755A EP2305458A4 (en) | 2008-06-20 | 2009-06-19 | VENTILATION FILTER AND MANUFACTURING METHOD THEREFOR |
CA2728275A CA2728275C (en) | 2008-06-20 | 2009-06-19 | Vent filter and method for manufacturing the same |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2008-162375 | 2008-06-20 | ||
JP2008162375A JP2010000464A (ja) | 2008-06-20 | 2008-06-20 | 通気フィルター及びその製造方法 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2009154307A1 true WO2009154307A1 (ja) | 2009-12-23 |
Family
ID=41434214
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2009/061664 WO2009154307A1 (ja) | 2008-06-20 | 2009-06-19 | 通気フィルター及びその製造方法 |
Country Status (8)
Country | Link |
---|---|
US (1) | US8512428B2 (ja) |
EP (1) | EP2305458A4 (ja) |
JP (1) | JP2010000464A (ja) |
KR (1) | KR101341227B1 (ja) |
CN (1) | CN102099187B (ja) |
AU (1) | AU2009261104B2 (ja) |
CA (1) | CA2728275C (ja) |
WO (1) | WO2009154307A1 (ja) |
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- 2009-06-19 WO PCT/JP2009/061664 patent/WO2009154307A1/ja active Application Filing
- 2009-06-19 CA CA2728275A patent/CA2728275C/en not_active Expired - Fee Related
- 2009-06-19 AU AU2009261104A patent/AU2009261104B2/en not_active Ceased
- 2009-06-19 US US12/999,832 patent/US8512428B2/en not_active Expired - Fee Related
- 2009-06-19 KR KR1020117000459A patent/KR101341227B1/ko not_active IP Right Cessation
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Cited By (5)
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---|---|---|---|---|
EP2583734A4 (en) * | 2010-06-16 | 2017-03-08 | Nitto Denko Corporation | Waterproof air-permeable filter and uses thereof |
US9636616B2 (en) | 2010-06-16 | 2017-05-02 | Nitto Denko Corporation | Water-proof air-permeable filter and use of the same |
US9855530B2 (en) | 2010-06-16 | 2018-01-02 | Nitto Denko Corporation | Water-proof air-permeable filter and use of the same |
US20150082984A1 (en) * | 2012-04-06 | 2015-03-26 | Nitto Denko Corporation | Oil repellency-imparted air-permeable filter with adhesive layer |
US9254467B2 (en) * | 2012-04-06 | 2016-02-09 | Nitto Denko Corporation | Oil repellency-imparted air-permeable filter with adhesive layer |
Also Published As
Publication number | Publication date |
---|---|
EP2305458A1 (en) | 2011-04-06 |
US20110138762A1 (en) | 2011-06-16 |
AU2009261104A1 (en) | 2009-12-23 |
US8512428B2 (en) | 2013-08-20 |
KR101341227B1 (ko) | 2013-12-12 |
CN102099187A (zh) | 2011-06-15 |
KR20110033189A (ko) | 2011-03-30 |
EP2305458A4 (en) | 2012-05-02 |
CN102099187B (zh) | 2015-01-07 |
CA2728275C (en) | 2015-05-05 |
CA2728275A1 (en) | 2009-12-23 |
JP2010000464A (ja) | 2010-01-07 |
AU2009261104B2 (en) | 2013-01-10 |
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