EP0139822A2
Expired / Lapsed
EP
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Filter element and its production
Assignee: Kurashiki Spinning Co Ltd
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Filing: 1984-05-07
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Granted: —
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Expires: 2004-05-07
Abstract
Abstract Described is a fiher element made wholly of fluorocarbon resin, comprising as essential elements a filter material produced by folding a sandwich-form sheet comprising a filter membrane made of a fluorocarbon resin and net supporters made of a thermoplastic fluorocarbon resin superimposed on the both surfaces thereof into a pleat form and liquid-tightly welding the edge parts of the both sides of the pleated sheet, sealed end parts produced by embedding the both end parts of said filter material except the central openings into a thermoplastic fluorocarbon resin to force the resin into the pleats, whereby the both end parts are each integrally and tightly welded, and fluorocarbon resin caps welded liquid-tightly with said sealed end parts, and the production thereof.
Inventors
- 👤 Tokuya Miyagi
- 👤 Akihisa Inoue
- 👤 Katushi Hamada
- 👤 Shoichi Fujimori
- 👤 Yoshihiro Hori
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 14:58
CPC Classifications
B; B01; B01D; B01D63/00; B01D63/06; B01D63/067; B01D39/00; B01D29/00; B01D29/11; B01D29/111; B01D29/13; B01D29/15; B01D29/21; B01D39/14; B01D39/16; B01D39/1692; B01D63/061; B29; B29C; B29C65/00; B29C65/02; B29C65/48; B29C65/4805; B29C65/481; B29C65/4815; B29C65/50; B29C65/5042; B29C65/5057; B29C65/5064; B29C65/5071; B29C65/5078; B29C65/5085; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/13; B29C66/135; B29C66/40; B29C66/41; B29C66/43; B29C66/432; B29C66/4322; B29C66/50; B29C66/51; B29C66/53; B29C66/534; B29C66/5344; B29C66/61; B29C66/612; B29C66/70; B29C66/71; B29C66/72; B29C66/723; B29C66/727; B29C66/729; B01D2201/00; B01D2201/04; B01D2201/0407; B29C65/06; B29C65/0672; B29C65/5007; B29C65/5021; B29C66/7294; B29L; B29L2031/00; B29L2031/14; Y; Y10; Y10S; Y10S55/00; Y10S55/05; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1036; Y10T156/1038
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
116 words
A filter element made wholly of a fluorocarbon resin comprising as essential elements a filter material produced by folding a sandwich-form sheet comprising a filter membrane made of a fluorocarbon resin and net supporters made of a thermoplastic fluorocarbon. resin superimposed on the both surfaces thereof into a pleat form and liquid-tightly welding the edge parts of the both sides of the pleated sheet, sealed end parts produced by embedding the both end parts of said filter material except the central openings into a thermoplastic fluorocarbon resin to force the resin into the pleates, whereby the both end parts are each integrally and tightly welded, and fluorocarbon resin caps welded liquid-tightly with said sealed end parts.
Claim 2
Dependent Claim
116 words
A filter element made wholly of a fluorocarbon resin comprising as essential elements a filter material produced by folding a sandwich-form sheet comprising a filter membrane made of a fluorocarbon resin and net supporters made of a thermoplastic fluorocarbon. resin superimposed on the both surfaces thereof into a pleat form and liquid-tightly welding the edge parts of the both sides of the pleated sheet, sealed end parts produced by embedding the both end parts of said filter material except the central openings into a thermoplastic fluorocarbon resin to force the resin into the pleates, whereby the both end parts are each integrally and tightly welded, and fluorocarbon resin caps welded liquid-tightly with said sealed end parts.
Claim 3
Dependent Claim
23 words
A filter element as in Claim 1, wherein the diameter of the fine pores of the filter membrane is 0.01 to 10 µm.
Claim 4
Dependent Claim
19 words
A filter element as in Claim 1 or 2, wherein the filter element is made of tetrafluoroethylene resin (PTFE).
Claim 5
Dependent Claim
35 words
A filter element as in any of Claims 1-3, wherein the net supporter is made of tetrafluoroethylene/ perfluoroalkyl vinyl ether copolymer resin (PFA), tetrafluoroethylene/hexafluoropropylene copolymer resin (FEP) or tetrafluoroethylene/hexafluoropropylene/ perfluoroalkyl vinyl ether terpolymer resin (EPE).
Claim 6
Dependent Claim
22 words
A filter element as in any of Claims 1-4, wherein the resin for sealing the end parts is PFA, FEP or EPE.
Claim 7
Dependent Claim
20 words
A filter element as in any of Claims 1-5, wherein the cap is made of PTFE, FEP, PFA or EPE.
Claim 8
Dependent Claim
26 words
A filter element as in any of Claims 1-6, wherein the element is provided with an additional fluorocarbon resin core material for supporting the filter material.
Claim 9
Dependent Claim
21 words
A filter element as in any of Claims 1-7, wherein the element is provided with an additional fluorocarbon resin protective jacket.
Claim 10
Independent Claim
180 words
A method for producing a filter element made wholly of a fluorocarbon resin characterized by forming sheet comprising a filter membrane made of a flurocarbon resin and net supporters made of thermoplastic fluorocarbon resin superimposed on the both surfaces thereof into a pleat form, bending the pleated sheet into a cylindrical form: liquid-tightly welding the edge parts of the adjacent both sides, heating the both end parts of the cylindrical pleat-form filter to a temperature higher than the melting point of the net supporter to pre-weld the pleats, inserting the end parts of the pre-welded pleate into a molten thermoplastic fluorocarbon resin in a circular mold having a central opening to force the resin into the pleats, whereby the end part and the molten resin are integrally welded together, fitting fluorocarbon resin caps having a prescribed shape in the ends parts of the resulting filter material and if desired, a flurocarbon resin core material for supporting the filter material inside the central opening of the resulting filter material, and then integrally welding two or three of the assembly thus obtained.
Claim 11
Independent Claim
180 words
A method for producing a filter element made wholly of a fluorocarbon resin characterized by forming sheet comprising a filter membrane made of a flurocarbon resin and net supporters made of thermoplastic fluorocarbon resin superimposed on the both surfaces thereof into a pleat form, bending the pleated sheet into a cylindrical form: liquid-tightly welding the edge parts of the adjacent both sides, heating the both end parts of the cylindrical pleat-form filter to a temperature higher than the melting point of the net supporter to pre-weld the pleats, inserting the end parts of the pre-welded pleate into a molten thermoplastic fluorocarbon resin in a circular mold having a central opening to force the resin into the pleats, whereby the end part and the molten resin are integrally welded together, fitting fluorocarbon resin caps having a prescribed shape in the ends parts of the resulting filter material and if desired, a flurocarbon resin core material for supporting the filter material inside the central opening of the resulting filter material, and then integrally welding two or three of the assembly thus obtained.
Claim 12
Dependent Claim
36 words
A method as in Claim 9, wherein the edge parts of the both sides of the pleat-form filter are welded together by inserting a welding tape made of a thermoplastic fluorocarbon resin between the edge parts.
Claim 13
Dependent Claim
19 words
A method as in Claim 9 or 10, wherein at Least one of the caps has a central opening.
References Cited (Backward Citations)
No citation records indexed.
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