JPH0277482A - Sheetlike gasket material - Google Patents
Sheetlike gasket materialInfo
- Publication number
- JPH0277482A JPH0277482A JP10167989A JP10167989A JPH0277482A JP H0277482 A JPH0277482 A JP H0277482A JP 10167989 A JP10167989 A JP 10167989A JP 10167989 A JP10167989 A JP 10167989A JP H0277482 A JPH0277482 A JP H0277482A
- Authority
- JP
- Japan
- Prior art keywords
- gasket material
- sheet
- inorganic filler
- resin
- ptfe
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000000463 material Substances 0.000 title claims abstract description 50
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims abstract description 34
- 239000004810 polytetrafluoroethylene Substances 0.000 claims abstract description 34
- 239000011256 inorganic filler Substances 0.000 claims abstract description 24
- 229910003475 inorganic filler Inorganic materials 0.000 claims abstract description 24
- 229920005989 resin Polymers 0.000 claims abstract description 22
- 239000011347 resin Substances 0.000 claims abstract description 22
- -1 polytetrafluoroethylene Polymers 0.000 claims abstract description 18
- 229920006015 heat resistant resin Polymers 0.000 claims abstract description 11
- 238000007789 sealing Methods 0.000 abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 5
- 238000003912 environmental pollution Methods 0.000 abstract description 4
- HPTYUNKZVDYXLP-UHFFFAOYSA-N aluminum;trihydroxy(trihydroxysilyloxy)silane;hydrate Chemical compound O.[Al].[Al].O[Si](O)(O)O[Si](O)(O)O HPTYUNKZVDYXLP-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052621 halloysite Inorganic materials 0.000 abstract description 3
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 abstract description 2
- 229910052622 kaolinite Inorganic materials 0.000 abstract description 2
- 239000000843 powder Substances 0.000 description 22
- 239000012784 inorganic fiber Substances 0.000 description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 13
- 230000006835 compression Effects 0.000 description 13
- 238000007906 compression Methods 0.000 description 13
- 239000000203 mixture Substances 0.000 description 9
- 239000002245 particle Substances 0.000 description 8
- 239000010425 asbestos Substances 0.000 description 7
- 229910052895 riebeckite Inorganic materials 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000002156 mixing Methods 0.000 description 5
- 229920006026 co-polymeric resin Polymers 0.000 description 4
- 239000004744 fabric Substances 0.000 description 4
- 239000000835 fiber Substances 0.000 description 4
- 239000011521 glass Substances 0.000 description 4
- 239000003921 oil Substances 0.000 description 4
- 239000011148 porous material Substances 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 239000004734 Polyphenylene sulfide Substances 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 229920001225 polyester resin Polymers 0.000 description 3
- 239000004645 polyester resin Substances 0.000 description 3
- 229920000069 polyphenylene sulfide Polymers 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 229910052845 zircon Inorganic materials 0.000 description 3
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 description 3
- 229920000049 Carbon (fiber) Polymers 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 239000006057 Non-nutritive feed additive Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000004917 carbon fiber Substances 0.000 description 2
- 206010061592 cardiac fibrillation Diseases 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000007720 emulsion polymerization reaction Methods 0.000 description 2
- 230000002600 fibrillogenic effect Effects 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 239000003365 glass fiber Substances 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910052902 vermiculite Inorganic materials 0.000 description 2
- 239000010455 vermiculite Substances 0.000 description 2
- 235000019354 vermiculite Nutrition 0.000 description 2
- PEVRKKOYEFPFMN-UHFFFAOYSA-N 1,1,2,3,3,3-hexafluoroprop-1-ene;1,1,2,2-tetrafluoroethene Chemical group FC(F)=C(F)F.FC(F)=C(F)C(F)(F)F PEVRKKOYEFPFMN-UHFFFAOYSA-N 0.000 description 1
- MIZLGWKEZAPEFJ-UHFFFAOYSA-N 1,1,2-trifluoroethene Chemical group FC=C(F)F MIZLGWKEZAPEFJ-UHFFFAOYSA-N 0.000 description 1
- 229910052582 BN Inorganic materials 0.000 description 1
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 1
- 206010010904 Convulsion Diseases 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 239000004696 Poly ether ether ketone Substances 0.000 description 1
- 239000004962 Polyamide-imide Substances 0.000 description 1
- 239000004695 Polyether sulfone Substances 0.000 description 1
- 239000004697 Polyetherimide Substances 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 1
- 150000001342 alkaline earth metals Chemical class 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
- 230000002528 anti-freeze Effects 0.000 description 1
- 230000000573 anti-seizure effect Effects 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000004760 aramid Substances 0.000 description 1
- 229920003235 aromatic polyamide Polymers 0.000 description 1
- 238000003490 calendering Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 229920000840 ethylene tetrafluoroethylene copolymer Polymers 0.000 description 1
- 229920002313 fluoropolymer Polymers 0.000 description 1
- 239000004811 fluoropolymer Substances 0.000 description 1
- 238000010528 free radical solution polymerization reaction Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- HCDGVLDPFQMKDK-UHFFFAOYSA-N hexafluoropropylene Chemical group FC(F)=C(F)C(F)(F)F HCDGVLDPFQMKDK-UHFFFAOYSA-N 0.000 description 1
- 229920001519 homopolymer Polymers 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 239000002557 mineral fiber Substances 0.000 description 1
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 description 1
- 229910052982 molybdenum disulfide Inorganic materials 0.000 description 1
- 229920002493 poly(chlorotrifluoroethylene) Polymers 0.000 description 1
- 229920002312 polyamide-imide Polymers 0.000 description 1
- 239000005023 polychlorotrifluoroethylene (PCTFE) polymer Substances 0.000 description 1
- 229920006393 polyether sulfone Polymers 0.000 description 1
- 229920002530 polyetherether ketone Polymers 0.000 description 1
- 229920001601 polyetherimide Polymers 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 239000009719 polyimide resin Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 229910052604 silicate mineral Inorganic materials 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 229920002050 silicone resin Polymers 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- WWNBZGLDODTKEM-UHFFFAOYSA-N sulfanylidenenickel Chemical compound [Ni]=S WWNBZGLDODTKEM-UHFFFAOYSA-N 0.000 description 1
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 1
- 239000010456 wollastonite Substances 0.000 description 1
- 229910052882 wollastonite Inorganic materials 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Landscapes
- Sealing Material Composition (AREA)
- Gasket Seals (AREA)
Abstract
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明はシート状ガスケット材に関するものである。[Detailed description of the invention] [Industrial application field] The present invention relates to a sheet gasket material.
［従来の技術］
従来、バルブ類、ポンプ類、配管用継手類、各種機器類
などに用いるガスケット材とじては、石綿を主成分とす
る石綿ジヨイントシートガスケットがもっとも一般に知
られている。しかしながら、近年、石綿は環境汚染の問
題があるとして、使用が制限されつつある。石綿を用い
ないガスケット材としては、ゴムシート、ゴムを結合材
としたバーミキュライトシート、膨張黒鉛シート、ポリ
テトラフルオロエチレン樹脂ディスバージョンを含浸さ
せたガラスクロス、カーボンクロスなどが知られている
。[Prior Art] Conventionally, asbestos joint sheet gaskets containing asbestos as a main component have been most commonly known as gasket materials used for valves, pumps, piping joints, various types of equipment, and the like. However, in recent years, the use of asbestos has been restricted due to the problem of environmental pollution. Known gasket materials that do not use asbestos include rubber sheets, vermiculite sheets using rubber as a binding material, expanded graphite sheets, glass cloth impregnated with polytetrafluoroethylene resin dispersion, and carbon cloth.
［発明が解決しようとする課題］
従来のガスケットは、それぞれ次に示す様な問題点があ
った。ゴムシートは、耐熱性が低いため、高温での使用
が困難である。ゴムを結合材としたバーミキュライトシ
ートは、ゴムの熱劣化により焼付きを生じ、またシール
性が悪い。膨張黒鉛シートは強度が低（取扱性が悪く、
また、高価である。ポリテトラフルオロエチレン樹脂デ
ィスバージョンを含浸したガラスクロス、カーボンクロ
スは、応力緩和が太き（シール性が悪く、また、高価で
ある。[Problems to be Solved by the Invention] Conventional gaskets have the following problems. Rubber sheets have low heat resistance, so it is difficult to use them at high temperatures. Vermiculite sheets using rubber as a binding material suffer from seizure due to thermal deterioration of the rubber, and also have poor sealing properties. Expanded graphite sheets have low strength (poor handling,
It is also expensive. Glass cloth and carbon cloth impregnated with polytetrafluoroethylene resin dispersion have large stress relaxation properties (poor sealing performance and are expensive).
［課題を解決するための手段］
本発明は、前述の問題点を解決すべくなされたものであ
る。すなわち、石綿ジヨイントシートに代替し得る、優
れた耐熱性、シール性を有し、かつ、環境汚染の問題が
な（、安価であり、さらに耐油、耐水性に優れたガスケ
ット材を提供しようとするものであり、５重量％以上の
ポリテトラフルオロエチレン樹脂、０．５〜１５重量％
の耐熱性樹脂（ポリテトラフルオロエチレン樹脂を除く
）および５０重量％以上の無機質充填材を含み、ポリテ
トラフルオロエチレン樹脂がフィブリル化されており、
無機質充填材がそのフィブリル間に存在していることを
特徴とするシート状ガスケット材を提供するものである
。[Means for Solving the Problems] The present invention has been made to solve the above-mentioned problems. In other words, we are trying to provide a gasket material that can replace asbestos joint sheets, has excellent heat resistance and sealing properties, is free from environmental pollution problems, is inexpensive, and has excellent oil and water resistance. 5% by weight or more of polytetrafluoroethylene resin, 0.5 to 15% by weight
heat-resistant resin (excluding polytetrafluoroethylene resin) and 50% by weight or more of an inorganic filler, the polytetrafluoroethylene resin is fibrillated,
The present invention provides a sheet-like gasket material characterized in that an inorganic filler exists between its fibrils.
本発明において、ポリテトラフルオロエチレン樹脂（以
下、ＰＴＦＥという）としては、テトラフルオロエチレ
ンの単独重合体にとどまらず、熔融流動性を付与するに
到らない程度の少量（例えば、０．５モル％程度以下）
の他の共単量体を共重合せ゛しめて変性されたものも含
まれる。かかる共単量体としては、ヘキサフルオロプロ
ピレン、パーフルオロ（アルキルビニルエーテル）、パ
ーフルオロ（アルコキシアルキルビニルエーテル）、ト
リフルオロエチレン、パーフルオロアルキルエチレンな
どが例示される。また、あまりに低分子量のものでは液
状あるいはゲル状となり好ましくな（、好ましくは、標
準比重から計算される分子量が１０３以上の固体を５０
％以上含むものである。また、乳化重合により得られた
ＰＴＦＥがフィブリル化し易いため好ましい。In the present invention, the polytetrafluoroethylene resin (hereinafter referred to as PTFE) is not limited to a homopolymer of tetrafluoroethylene, but may be used in a small amount (for example, 0.5 mol% below)
It also includes those modified by copolymerizing other comonomers. Examples of such comonomers include hexafluoropropylene, perfluoro(alkyl vinyl ether), perfluoro(alkoxyalkyl vinyl ether), trifluoroethylene, perfluoroalkyl ethylene, and the like. In addition, if the molecular weight is too low, it becomes liquid or gel-like, which is not desirable (preferably, a solid with a molecular weight of 103 or more calculated from standard specific gravity is 50
% or more. Further, PTFE obtained by emulsion polymerization is preferred because it is easily fibrillated.
本発明において、耐熱性樹脂としては、高温において流
動性を示し、シート状ガスケット材の使用温度において
分解、滲出しない程度以上の耐熱性を有するものが好ま
しく採用される。In the present invention, as the heat-resistant resin, it is preferable to use a resin that exhibits fluidity at high temperatures and has a heat resistance that does not decompose or ooze out at the temperature at which the sheet-like gasket material is used.
かかる耐熱性樹脂としては、テトラフルオロエチレン−
ヘキサフルオロプロピレン共重合体樹脂、テトラフルオ
ロエチレン−パーフルオロ（アルキルビニルエーテル）
共重合体樹脂、テトラフルオロエチレン−ヘキサフルオ
ロプロピレン−パーフルオロ（アルキルビニルエーテル
）共重合体樹脂、ポリクロロトリフルオロエチレン樹脂
、テトラフルオロエチレン−エチレン共重合体樹脂、ポ
リフェニレンサルファイド樹脂、ポリイミド樹脂、ポリ
アミドイミド樹脂、ポリエーテルスルホン樹脂、オキシ
ベンゾイルポリエステル樹脂、ポリエーテルイミド樹脂
、ポリエーテルエーテルケトン樹脂、液晶性ポリエステ
ル樹脂、芳香族ポリアミド樹脂、ケイ素樹脂などが例示
される。特に樹脂単独成形品の熱変形温度（ＡＳＴＭ
０６４ｇ、荷重１８．６ｋｇ／ｃｍ”による）が９０℃
以上の耐熱性樹脂がシート状ガスケット剤の耐熱性およ
びシール性に優れるため好ましく採用される。Such heat-resistant resins include tetrafluoroethylene-
Hexafluoropropylene copolymer resin, tetrafluoroethylene-perfluoro(alkyl vinyl ether)
Copolymer resin, tetrafluoroethylene-hexafluoropropylene-perfluoro(alkyl vinyl ether) copolymer resin, polychlorotrifluoroethylene resin, tetrafluoroethylene-ethylene copolymer resin, polyphenylene sulfide resin, polyimide resin, polyamideimide Examples include resins, polyethersulfone resins, oxybenzoyl polyester resins, polyetherimide resins, polyetheretherketone resins, liquid crystalline polyester resins, aromatic polyamide resins, and silicone resins. In particular, the heat distortion temperature (ASTM) of resin-only molded products
064g, load 18.6kg/cm") at 90℃
The above-mentioned heat-resistant resins are preferably employed because they have excellent heat resistance and sealing properties for sheet gasket materials.
本発明において、無機質充填材としては、耐熱性、耐薬
品性に優れた無機質粉末、粉末状無機質繊維またはカー
ボン粉末が好ましく採用される。無機質粉末としては、
平均粒径が１００μ程度以下のものが好ましく採用され
る。平均粒径が大きすぎると、シート状ガスケット材と
した時の表面平滑性が損なわれ、好ましくない。In the present invention, as the inorganic filler, inorganic powder, powdered inorganic fiber, or carbon powder having excellent heat resistance and chemical resistance is preferably employed. As an inorganic powder,
Those having an average particle size of about 100 μm or less are preferably employed. If the average particle size is too large, the surface smoothness of the sheet gasket material will be impaired, which is not preferable.
また、平均粒径の大きな無機質粉末では、シート状ガス
ケット材の緻密性が得られず、気孔率および気孔径が大
きいものとなりシール性が充分でなくなり好ましくない
。また、粒径の大きい硬質の無機質粉末を用いた場合に
、成形時に成形装置を損傷することがあり好ましくない
。In addition, inorganic powder with a large average particle size does not provide the denseness of the sheet-like gasket material, and the porosity and pore size become large, resulting in insufficient sealing performance, which is not preferable. Furthermore, if a hard inorganic powder with a large particle size is used, the molding device may be damaged during molding, which is not preferable.
さらに好ましくは、平均粒径０．１〜７０μ程度の無機
質粉末である。また、無機質粉末として、粒径の異なる
２種以上を混合使用すると充填効率が向上し、好ましい
。More preferably, it is an inorganic powder with an average particle size of about 0.1 to 70 μm. Further, it is preferable to use a mixture of two or more types of inorganic powders having different particle sizes, since this improves the filling efficiency.
かかる無機質粉末としては、ケイ素およびアルミニウム
を主体とし、マグネシウム、鉄、アルカリ土類金属、ア
ルカリ金属などを含む含水珪酸塩鉱物である一般に粘土
と呼ばれるものやワラストナイトなどの天然鉱物粉末、
シリカ、アルミナ、ガラス、ジルコン、酸化チタン、酸
化鉄などの酸化物粉末、硼化ジルコニウム、窒化アルミ
、窒化珪素、窒化硼素、炭化ジルコン、炭化ケイ素、炭
化タングステンなどのセラミックス粉末、硫化ニッケル
、硫酸ジルコン、二硫化モリブデンなどの硫化物粉末な
どが例示される。中でも、天然鉱物粉末が好ましく採用
され、特に、カオリナイト、ハロイサイト、加水ハロイ
サイトなどに代表されるカオリン型の粘土が好ましい、
また、粉末状無機質繊維としては、直径０．１〜３０μ
程度、特に好ましくは直径０．５〜１５μ程度であり、
長さ５０〜３００μ、特に好ましくは７０〜２００μ程
度が好ましく採用される。かかる粉末状無機質繊維とし
ては、粉末状カーボン繊維、粉末状ガラス繊維粉末、粉
末状アルミナ繊維、各種粉末状天然鉱物繊維などが例示
される。また、カーボン粉末としては、粒径０．Ｏ１〜
０．１μ程度のものが好ましく採用される。Examples of such inorganic powders include hydrated silicate minerals that are mainly composed of silicon and aluminum and also contain magnesium, iron, alkaline earth metals, alkali metals, etc., generally called clay, and natural mineral powders such as wollastonite;
Oxide powders such as silica, alumina, glass, zircon, titanium oxide, and iron oxide, ceramic powders such as zirconium boride, aluminum nitride, silicon nitride, boron nitride, zircon carbide, silicon carbide, and tungsten carbide, nickel sulfide, and zircon sulfate. Examples include sulfide powder such as molybdenum disulfide. Among these, natural mineral powders are preferably employed, and kaolin-type clays represented by kaolinite, halloysite, hydrated halloysite, etc. are particularly preferred.
In addition, as the powdered inorganic fiber, the diameter is 0.1 to 30 μm.
diameter, particularly preferably about 0.5 to 15 μm,
A length of about 50 to 300 μm, particularly preferably about 70 to 200 μm, is preferably employed. Examples of such powdered inorganic fibers include powdered carbon fiber, powdered glass fiber powder, powdered alumina fiber, and various powdered natural mineral fibers. In addition, the carbon powder has a particle size of 0. O1~
A thickness of about 0.1μ is preferably employed.
また、本発明において、無機質充填材としては、無機質
粉末の単独もしくは無機質粉末と若干量の粉末状無機質
繊維およびまたはカーボン粉末の混合物が好ましく採用
される。無機質粉末を単独でまたは無機質粉末とカーボ
ン粉末の混合物を用いると、シート状ガスケット材の低
気孔率化、小気孔径化が容易となるため好ましい。また
、粉末状無機質繊維を混合使用した場合、粉末状無機質
繊維を混合使用しない場合に比べ、低気孔率化、小気孔
径化が若干難しくなるが、圧縮率の大きなシート状ガス
ケット材となるため、シール面のなじみ性が優れたもの
となる。また、無機質充填材として、粉末状無機質繊維
またはカーボン粉末を単独で、または粉末状無機質繊維
とカーボン粉末の混合物を用いると、シート状成形が困
難になるためこのような使用態様は好ましいとはいえな
い。無機質充填材として、無機質粉末と粉末状無機質繊
維およびまたはカーボン粉末の混合物を用いる場合の混
合割合は、無機質粉末ｉｏｏ重量部当り粉末状無機質繊
維およびまたはカーボン粉末がｌＯ重量部程度以下とす
ることが好ましい。粉末状無機質繊維およびまたはカー
ボン粉末の割合が大きすぎると、シート状ガスケット材
の成形性が悪くなり、またシート状ガスケット材の寿命
が小さなものになり、好ましくない。Further, in the present invention, as the inorganic filler, an inorganic powder alone or a mixture of an inorganic powder and a small amount of powdered inorganic fiber and/or carbon powder is preferably employed. It is preferable to use an inorganic powder alone or a mixture of an inorganic powder and a carbon powder because it is easy to reduce the porosity and small pore diameter of the sheet gasket material. In addition, when powdered inorganic fibers are mixed and used, it is slightly more difficult to reduce the porosity and small pore diameter than when powdered inorganic fibers are not mixed, but the result is a sheet-like gasket material with a high compressibility. , the sealing surface has excellent conformability. Furthermore, if powdered inorganic fiber or carbon powder is used alone, or a mixture of powdered inorganic fiber and carbon powder is used as the inorganic filler, it will be difficult to form the material into a sheet shape, so although such usage is preferable, do not have. When using a mixture of inorganic powder and powdered inorganic fiber and/or carbon powder as the inorganic filler, the mixing ratio may be approximately 10 parts by weight or less of powdered inorganic fibers and/or carbon powder per 10 parts by weight of inorganic powder. preferable. If the proportion of the powdered inorganic fibers and/or carbon powder is too large, the moldability of the sheet gasket material will deteriorate and the life of the sheet gasket material will be shortened, which is not preferable.
本発明のシート状ガスケット材は、ＰＴＦＥを５重量％
以上、耐熱性樹脂（ＰＴＦＥを除く）を０．５〜１５重
量％、無機質充填材を５０重量％以上含有する。ＰＴＦ
Ｈの量が５重量％よりも小さい場合には、シート状ガス
ケット材としてのシート成形が困難であり、また、成形
されたシートも圧縮に対する復元率が小さいものとなり
、気孔率の小さなガスケット材が得られ難（なり、ガス
ケットとしての使用に耐え難いものとなるため好ましく
ない。特にＰＴＦＥがｌＯ重量％以上含まれることが好
ましい。ＰＴＦＥの量の上限は特に限定されないが、あ
まりに多くなりすぎると高価なものになり、汎用ガスケ
ット材としての特徴が薄れること、ガスケット材の圧縮
率が低下することなどから、５０重量％以下、特に４０
重量％以下とすることが好ましい。耐熱性樹脂の量が少
なすぎる場合、シート状ガスケット材中に空隙部が多く
なり、シール性が悪（なる。また多すぎると応力緩和が
悪くなり、シール性が低下するため好ましくない、特に
耐熱性樹脂の量を１〜ｌＯ重量％程度とすることが好ま
しい。The sheet-like gasket material of the present invention contains 5% by weight of PTFE.
As described above, the heat-resistant resin (excluding PTFE) is contained in an amount of 0.5 to 15% by weight, and the inorganic filler is contained in an amount of 50% by weight or more. PTF
If the amount of H is less than 5% by weight, it is difficult to form a sheet into a sheet gasket material, and the formed sheet also has a low recovery rate against compression, making it difficult to use a gasket material with a small porosity. This is not preferable because it becomes difficult to obtain (and cannot withstand use as a gasket).In particular, it is preferable that PTFE is contained in an amount of 10% by weight or more.The upper limit of the amount of PTFE is not particularly limited, but if it is too large, it becomes expensive. 50% by weight or less, in particular 40%
It is preferable that the amount is less than % by weight. If the amount of heat-resistant resin is too small, there will be many voids in the sheet gasket material, resulting in poor sealing performance. If it is too large, stress relaxation will be poor and sealing performance will deteriorate, which is undesirable. It is preferable that the amount of the polyester resin is about 1 to 10% by weight.
また、無機質充填材の量が５０重量％よりも小さな場合
には、応力緩和率が大きくなり好ましくない。また、高
価なものとなるため汎用ガスケットとしての利用に適さ
なくなることもある。無機質充填材の量が大きくなると
、応力緩和率が小さくなるが、緻密なシート状ガスケッ
ト材を得難くなる。すなわち、シール性が低下し易くな
る傾向がある。好ましい無機質充填材の含有量は６０〜
９０重量％である。Furthermore, if the amount of the inorganic filler is less than 50% by weight, the stress relaxation rate will increase, which is not preferable. Furthermore, since it is expensive, it may not be suitable for use as a general-purpose gasket. As the amount of inorganic filler increases, the stress relaxation rate decreases, but it becomes difficult to obtain a dense sheet-like gasket material. That is, there is a tendency for the sealing performance to deteriorate easily. The preferred content of the inorganic filler is 60~
It is 90% by weight.
本発明のシート状ガスケット材は、上記ＰＴＦＥ、耐熱
性樹脂、無機質充填材の他に、無機質繊維などを含んで
いてもよい。無機質繊維としては、アルミナ繊維、カー
ボン繊維、ガラス繊維などが例示されるが、これらは混
合あるいはシート状ガスケット材成形時に砕かれるが、
粉末状に砕かれるものは少な（、大半は比較的長い繊維
としてガスケット材中に存在することになる。この様な
繊維が存在する′場合には、ガスケット材の強度が向上
するが、気孔率および平均気孔径を小さなものにするこ
とが困難になるため、あまりに多量に入れることは好ま
しくない。無機質繊維の添加量は、３重量％以下である
ことが好ましい。The sheet-like gasket material of the present invention may contain inorganic fibers in addition to the above-mentioned PTFE, heat-resistant resin, and inorganic filler. Examples of inorganic fibers include alumina fibers, carbon fibers, and glass fibers, which are crushed during mixing or forming sheet gasket materials.
Few of them are crushed into powder (but most of them are present in the gasket material as relatively long fibers.If such fibers are present, the strength of the gasket material improves, but the porosity Also, it is difficult to reduce the average pore diameter, so it is not preferable to add too much.The amount of inorganic fiber added is preferably 3% by weight or less.
本発明のシート状ガスケット材において、ＰＴＦＥはフ
ィブリル化されており、無機質充填材がそのフィブリル
間に存在している。 ＰＴＦＥがフィブリル化されてい
ない、または無機質充填材がＰＴＦＨのフィブリル間に
存在しない場合には、シート状ガスケット材は極めて脆
いものとなり、実際の使用には耐えられないものとなる
。In the sheet gasket material of the present invention, PTFE is fibrillated, and an inorganic filler exists between the fibrils. If the PTFE is not fibrillated or if an inorganic filler is not present between the fibrils of PTFH, the sheet gasket material becomes extremely brittle and cannot withstand actual use.
本発明のシート状ガスケット材は、ＰＴＦＥがフィブリ
ル化されている。すなわち、ミクロ三次元網目構造を形
成しており、無機質充填材がその三次元網目構造の間に
均一に分散して存在している、すなわち、無機質充填材
がＰＴＦＨのフィブリルにより強固に保持されているた
め、ガスケット材として充分な強度が得られるのである
。In the sheet-like gasket material of the present invention, PTFE is fibrillated. In other words, it forms a micro three-dimensional network structure, and the inorganic filler exists uniformly dispersed between the three-dimensional network structure.In other words, the inorganic filler is firmly held by the PTFH fibrils. Therefore, sufficient strength can be obtained as a gasket material.
また、この様な構造を有する本発明のシート状ガスケッ
ト材゛は、ＰＴＦＥがガスケット材全体にわたって均一
に存在するため、少量のＰＴＦＥ含有量にもかかわらず
、ガスケット材全体にＰＴＦＨの優れた撥水、撥油性が
発揮されるものである。すわなち、ガスケット材が耐油
性、耐水性に優れたものとなる。ＰＴＦＥは、高剪断力
をかけることにより容易にフィブリル化されつるもので
ある。また、ＰＴＦＨのフィブリル間に均一に無機質充
填材を分散させる方法としては、フィブリル化されてい
ないＰＴＦＥと無機質充填材を添加した後、混合と同時
または均一混合後にＰＴＦＥをフィブリル化する方法な
どにより容易に達成される。例えば、所定割合のＰＴＦ
Ｅ粉末と無機質充填材をナフサなどの加工助剤の存在下
または非存在下に例えばミキサーなどにより高速撹拌す
る方法など、高剪断力下に撹拌混合することにより達成
される。また、この混合物を、シリンダ断面積とノズル
部断面積の比の大きな押出機で押出すなど、さらに高剪
断力を加えることにより、ＰＴＦＥをより高度にフィブ
リル化することもできる。In addition, in the sheet-like gasket material of the present invention having such a structure, PTFE exists uniformly throughout the gasket material, so despite the small amount of PTFE content, the excellent water repellency of PTFH is maintained throughout the gasket material. , exhibits oil repellency. In other words, the gasket material has excellent oil resistance and water resistance. PTFE is easily fibrillated and vines upon application of high shear forces. In addition, an easy method for uniformly dispersing the inorganic filler between the fibrils of PTFH is to add non-fibrillated PTFE and the inorganic filler, and then fibrillate the PTFE at the same time as mixing or after uniform mixing. will be achieved. For example, a predetermined percentage of PTF
This is achieved by stirring and mixing the E powder and the inorganic filler under high shear force, such as by stirring at high speed with a mixer, in the presence or absence of a processing aid such as naphtha. Furthermore, the PTFE can be fibrillated to a higher degree by extruding this mixture using an extruder having a large ratio of the cross-sectional area of the cylinder to the cross-sectional area of the nozzle portion, or by applying a higher shearing force.
本発明のシート状ガスケット材は、前述したＰＴＦＥフ
ィブリル間に無機質充填材を分散させた組成物を、プレ
ス型あるいはロールなどにより加圧成形、圧延成形など
公知のシート成形法により製造することができる。特に
製造作業上、連続成形が可能であるロール圧延成形法が
好ましく採用される。The sheet-shaped gasket material of the present invention can be produced by a known sheet forming method such as pressure forming or rolling using a press mold or roll using a composition in which an inorganic filler is dispersed between the PTFE fibrils. . Particularly from the viewpoint of manufacturing operations, a roll forming method that allows continuous forming is preferably employed.
本発明のシート状ガスケット材において、ＰＴＦＥは焼
成されていても良く、未焼成であっても良い。ＰＴＦＥ
が未焼成である場合には、シート状ガスケット材は比較
的圧縮率が大きなものとなるため、低締付圧であっても
シール面によくなじみ、優れたシール性を発揮する。す
なわち、ガラス配管など強い締付は圧をかけることので
きない用途において特に有用である。また、ＰＴＦＥが
焼成されている場合には、シート状ガスケット材は、強
度に優れるため、比較的高い締付は圧のかかる用途にお
いて特に有用である。ＰＴＦＥを焼成する場合、シート
成形後に焼成することが好ましい、 ＰＴＦＥをシート
成形前に焼成するとシート成形が困難になる。またＰＴ
ＦＥをフィブリル化前に焼成するとフィブリル化が困難
になるという問題がある。In the sheet-like gasket material of the present invention, PTFE may be fired or unfired. PTFE
When the gasket material is unfired, the compressibility of the sheet gasket material is relatively large, so it conforms well to the sealing surface even at low tightening pressure and exhibits excellent sealing performance. That is, strong tightening is particularly useful in applications such as glass piping where pressure cannot be applied. Additionally, when the PTFE is fired, the sheet-like gasket material has excellent strength, so relatively high tightening is particularly useful in high-pressure applications. When firing PTFE, it is preferable to fire it after sheet forming. If PTFE is fired before sheet forming, sheet forming becomes difficult. Also PT
If FE is fired before fibrillation, there is a problem in that fibrillation becomes difficult.
本発明シート状ガスケット材は、それ単体でシートガス
ケットとして使用してもよいし、金属板などと積層して
、複合ガスケットとして使用してもよい、複合ガスケッ
トとする場合、爪立て鋼板やエンボス加工アルミ板など
の凹凸付き金属板、メツシュ状の開口を有する金属板や
金網などの担体に、本発明のシート状ガスケット材を貼
り合せあるいは圧着などの方法により一体化成形するこ
とにより達成される。例えば、鉄製二軸ロールを用い、
金網の両面にシート状ガスケット材を圧着することによ
り、金属コアの複合ガスケットとすることができるし、
また、同様にシート状ガスケット材の両面に爪立て鋼板
を圧着することにより、金属被覆の複合ガスケットとす
ることもできる。The sheet gasket material of the present invention may be used alone as a sheet gasket, or may be laminated with a metal plate, etc., and used as a composite gasket. This is achieved by integrally molding the sheet-like gasket material of the present invention onto a carrier such as a metal plate with irregularities such as a plate, a metal plate having a mesh-like opening, a wire mesh, etc. by a method such as bonding or pressure bonding. For example, using two iron rolls,
By crimping sheet gasket material on both sides of the wire mesh, it is possible to create a composite gasket with a metal core.
Furthermore, a metal-coated composite gasket can be obtained by similarly press-fitting a nail holder steel plate to both sides of a sheet-like gasket material.
［実施例］
以下に実施例を挙げて本発明を具体的に説明するが、か
かる実施例によって本発明が何ら限定されるものではな
い。[Examples] The present invention will be specifically described below with reference to Examples, but the present invention is not limited to these Examples in any way.
実施例１〜４．比較例１
第１表に示した割合で、乳化重合により得られたＰＴＦ
Ｅ粉末（旭フロロポリマー製ＣＤ−１）とクレー（平均
粒径１０μ、上屋カオリン工業■製）、溶液重合により
えられたテトラフルオロエチレン−パーフルオロ（アル
キルビニルエーテル）共重合体樹脂（ＰＦＡ） 、ポリ
フェニレンサルファイド樹脂（ＰＰＳ）とに、加工助剤
を添加し高速撹拌した後、乾燥することによりＰＴＦＥ
組成物を得た。この組成物に液状潤滑剤２０重量％添加
し、ペースト押出しした後、カレンダリングすることに
よりシート状成形物を得た。Examples 1-4. Comparative Example 1 PTF obtained by emulsion polymerization in the proportions shown in Table 1
E powder (CD-1 manufactured by Asahi Fluoropolymer), clay (average particle size 10μ, manufactured by Ueya Kaolin Kogyo ■), and tetrafluoroethylene-perfluoro(alkyl vinyl ether) copolymer resin (PFA) obtained by solution polymerization. , by adding processing aids to polyphenylene sulfide resin (PPS), stirring at high speed, and drying to produce PTFE.
A composition was obtained. 20% by weight of a liquid lubricant was added to this composition, the paste was extruded, and then calendered to obtain a sheet-like molded product.
このシート状成形物を焼成した後、鉄製２転ローラーに
より５ｐｃｃ材厚さ ０．２ｍｍ、穴径１．０ｍｍの丸
穴フックの爪立て鋼板の両面に圧着し、厚さ １．２ａ
＋ｍの試験片を得た。かかる試験片を用いて、圧縮率、
復元率、応力緩和率およびシール性を測定した結果を第
１表に示した。After firing this sheet-like molded product, it was pressed with two iron rollers to both sides of a steel plate for a round hole hook with a thickness of 0.2 mm and a hole diameter of 1.0 mm, and the thickness was 1.2 mm.
+m test pieces were obtained. Using such a test piece, the compressibility,
Table 1 shows the results of measuring the recovery rate, stress relaxation rate, and sealability.
なお、圧縮率、復元率、応力緩和率およびシール性の測
定は、それぞれ以下の方法により測定した。Note that the compression ratio, recovery ratio, stress relaxation ratio, and sealability were each measured by the following methods.
圧縮率、復元率
インストロン型万能試験機の定盤に試験片をのせ圧縮治
具により圧縮した。圧縮スピードは１ＩＩＩｆｌＩＺ分
とした。７ｋｇ／ｃｍ”の面圧に達した時の厚さを元の
厚さとし、圧縮力が３５０ｋｇ／ｃＩ１１２の面圧に到
達後ただちに圧縮を停止しクロスヘツドを同じ速度で移
動させ、復元曲線を得た。記録紙による圧縮復元曲線、
圧縮速度、記録紙送り速度から圧縮率、復元率を求めた
。Compression rate and recovery rate A test piece was placed on the surface plate of an Instron type universal testing machine and compressed using a compression jig. The compression speed was 1IIIflIZ. The thickness when the surface pressure of 7 kg/cm'' was reached was taken as the original thickness, and as soon as the compression force reached the surface pressure of 350 kg/cI112, compression was stopped and the crosshead was moved at the same speed to obtain a restoration curve. . Compression and decompression curve using recording paper,
The compression ratio and restoration ratio were determined from the compression speed and recording paper feeding speed.
応力緩和率
インストロン型万能試験機の定盤に試験片をのせ、圧縮
治具により圧縮した。圧縮スピードは１ｍｍ／分とした
。圧縮力が３５０ｋｇ／ｃｍ”に到達後ただちに圧縮を
停止した。圧縮状態で２時間放置し、圧縮力の変化曲線
を得た。初期圧縮力と２時間後の圧縮力から応力緩和率
を求めた。Stress Relaxation Rate The test piece was placed on the surface plate of an Instron type universal testing machine and compressed using a compression jig. The compression speed was 1 mm/min. Immediately after the compressive force reached 350 kg/cm'', compression was stopped.The compressed state was left for 2 hours and a change curve of the compressive force was obtained.The stress relaxation rate was determined from the initial compressive force and the compressive force after 2 hours. .
シール性
フランジ型シール治具を用い、サンプルを締付圧力５０
ｋｇ／ｃｍ”で固定し不凍液５０重量％水溶液を圧力１
ｋｇ／ｃｍ”で１５分間加圧した後、漏れの有無を観
察した。漏れがなければ更に０、５ｋｇ／ｃｍ”昇圧し
て、１５分間保持後、同様に観察し、以後圧力を０．５
ｋｇ／ｃｍ２づつ加圧して、漏れの起こらない最大圧力
を測定した。Using a sealing flange type sealing jig, tighten the sample with a pressure of 50
kg/cm" and apply a 50% by weight aqueous solution of antifreeze to a pressure of 1
After pressurizing at 0.5 kg/cm" for 15 minutes, the presence or absence of leakage was observed. If there was no leakage, the pressure was further increased by 0.5 kg/cm", maintained for 15 minutes, observed in the same manner, and thereafter the pressure was increased to 0.5 kg/cm".
The pressure was increased in kg/cm2 increments, and the maximum pressure at which no leakage occurred was measured.
第１表
ネ参考例として、石綿系へラダーガスケットを用いて同
様の試験を行なった結果を示す。As a reference example, Table 1 shows the results of a similar test using an asbestos-based ladder gasket.
［発明の効果］
本発明のシート状ガスケット材は、特定の割合で耐熱性
樹脂が含まれるため、応力緩和率が小さ（、シール性が
良好である。すなわち、優れたシール性を有しかつ、ガ
スケット材としての寿命が長く長期間の使用が可能であ
る。また、石綿を含まないため、環境汚染の問題がない
。さらに、耐熱性に優れており、加熱による劣化、硬化
または焼付きもないため、長期間の連続使用が可能であ
り、補修費用が大幅に低減されるとともに、焼付防止材
の使用が無用であるなどの効果を有する。また、耐油性
、耐水性に極めて優れるため、各種液体のシール材とし
て優れた効果を発揮し得る。また、本発明のシート状ガ
スケット材は、長尺シート成形が可能であるため、生産
性に優れ、安価で製造することができる。また、無機質
充填材がＰＴＦＨのフィブリル間に強固に保持されてい
るため強度が大きく、取扱い性に優れる。[Effects of the Invention] Since the sheet-like gasket material of the present invention contains a heat-resistant resin in a specific proportion, it has a small stress relaxation rate (and has good sealing properties; that is, it has excellent sealing properties and It has a long life as a gasket material and can be used for a long period of time.It also does not contain asbestos, so there is no problem of environmental pollution.Furthermore, it has excellent heat resistance and will not deteriorate, harden or seize due to heating. Because of this, it can be used continuously for a long period of time, significantly reducing repair costs, and eliminating the need for anti-seizure materials.In addition, it has excellent oil and water resistance, so It can exhibit excellent effects as a sealing material for various liquids.Furthermore, the sheet-like gasket material of the present invention can be formed into a long sheet, so it has excellent productivity and can be manufactured at low cost. Since the inorganic filler is firmly held between the fibrils of PTFH, it has high strength and is easy to handle.
Claims (1)
０．５〜１５重量％の耐熱性樹脂（ポリテトラフルオロ
エチレン樹脂を除く）および５０重量％以上の無機質充
填材を含み、ポリテトラフルオロエチレン樹脂がフィブ
リル化されており、無機質充填材がそのフィブリル間に
存在していることを特徴とするシート状ガスケット材。1.5% by weight or more of polytetrafluoroethylene resin,
Contains 0.5 to 15% by weight of a heat-resistant resin (excluding polytetrafluoroethylene resin) and 50% by weight or more of an inorganic filler, the polytetrafluoroethylene resin is fibrillated, and the inorganic filler is the fibril. A sheet-like gasket material that is characterized by being present in between.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15130088 | 1988-06-21 | ||
| JP63-151300 | 1988-06-21 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0277482A true JPH0277482A (en) | 1990-03-16 |
| JPH0649863B2 JPH0649863B2 (en) | 1994-06-29 |
Family
ID=15515668
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1101679A Expired - Fee Related JPH0649863B2 (en) | 1988-06-21 | 1989-04-24 | Sheet flat gasket material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0649863B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012117676A (en) * | 2012-01-13 | 2012-06-21 | Nichias Corp | Fluororesin sheet for gasket, method of manufacturing the same, and sheet gasket |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5778474A (en) * | 1980-08-29 | 1982-05-17 | Maruro Co Inc Za | Chemical resistant resilient gasket material |
| JPH0521956A (en) * | 1991-07-11 | 1993-01-29 | Mitsubishi Electric Corp | Manufacture of multilayered printed circuit board |
-
1989
- 1989-04-24 JP JP1101679A patent/JPH0649863B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5778474A (en) * | 1980-08-29 | 1982-05-17 | Maruro Co Inc Za | Chemical resistant resilient gasket material |
| JPH0521956A (en) * | 1991-07-11 | 1993-01-29 | Mitsubishi Electric Corp | Manufacture of multilayered printed circuit board |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012117676A (en) * | 2012-01-13 | 2012-06-21 | Nichias Corp | Fluororesin sheet for gasket, method of manufacturing the same, and sheet gasket |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0649863B2 (en) | 1994-06-29 |
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