EP0187358A2
Expired / Lapsed
EP
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Filter element and its production
Assignee: Kurashiki Spinning Co Ltd
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Filing: 1985-12-20
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Granted: —
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Expires: 2005-12-20
Abstract
Abstract The present invention provides a filter element made wholly of fluorocarbon resin and production thereof. As the filter element is wholly made of fluorocarbon resin, it has an excellent chemicals resistance, and temperature resistance end is free from metal leaching. Though it has been difficult t) produce such a fluorocarbon filter element free from leadage, in the present invention it can be produced at high ,ield.
Inventors
- 👤 Tokuya Miyagi
- 👤 Akihisa Inoue
- 👤 Taisuke Otsubo
- 👤 Yoshihiro Hori
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 20:11
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/52; B01D46/521; B01D29/00; B01D29/11; B01D29/111; B01D29/13; B01D29/15; B01D29/21; B01D46/24; B01D46/2403; B01D46/2411; B01D63/00; B01D63/06; B01D63/061; B01D63/067; B29; B29C; B29C65/00; B29C65/02; B29C65/18; B29C65/38; B29C65/48; B29C65/4805; B29C65/481; B29C65/4815; B29C65/50; B29C65/5042; B29C65/5057; B29C65/5064; B29C65/5071; B29C65/5078; 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; B29C66/727; B01D2265/00; B01D2265/04; B29C65/482; B29C66/729; B29C66/7294; B29L; B29L2031/00; B29L2031/14; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1036; Y10T156/1038; Y10T156/1051
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
121 words
A method of producing a filter element made wholly of a fluorocarbon resin which comprises superimposing a net supporter made of thermoplastic fluorocarbon resin on the both side of a filter membrane made of fluorocarbon resin to form a pleated sheet, bending the pleated sheet to cylindrical form, liquid-tightly welding the edge parts of adjacent sides of the sheet, inserting slowly an end part of the obtained cylindrical pleated filter material into melted thermoplastic fluorocarbon resin maintained at a temperature more than the melting point, if desired, a protective core made of fluorocarbon resin is fixed to the cylindrical pleated filter material, at a rate of not more than 6 mm/minute, and welding for sealing the end part of the filter.
Claim 2
Independent Claim
121 words
A method of producing a filter element made wholly of a fluorocarbon resin which comprises superimposing a net supporter made of thermoplastic fluorocarbon resin on the both side of a filter membrane made of fluorocarbon resin to form a pleated sheet, bending the pleated sheet to cylindrical form, liquid-tightly welding the edge parts of adjacent sides of the sheet, inserting slowly an end part of the obtained cylindrical pleated filter material into melted thermoplastic fluorocarbon resin maintained at a temperature more than the melting point, if desired, a protective core made of fluorocarbon resin is fixed to the cylindrical pleated filter material, at a rate of not more than 6 mm/minute, and welding for sealing the end part of the filter.
Claim 3
Dependent Claim
14 words
A method of Claim 1, in which the filter membrane is made of PTFE.
Claim 4
Dependent Claim
30 words
A method of Claim 1, in which at the welding of the side edges of pleated filter a tape made of thermoplastic fluorocarbon resin is inserted between the side edges.
Claim 5
Dependent Claim
17 words
A method of Claim 1, in which the net supporter is made of PFA, FEP or EPE.
Claim 6
Dependent Claim
22 words
A method of Claim 1, in which the resin for sealing the end parts is PFA, FEP, EPE, PCTRE, ECTFE or ETFE.
Claim 7
Dependent Claim
13 words
A method of Claim 5. in which the resin is an end cap.
Claim 8
Dependent Claim
27 words
A method of Claim 1, in which the insertion of the end part is effected by puttin q a constant weight on the top of filter material.
Claim 9
Dependent Claim
19 words
A method of Claim 1, in which the insertion of the end part is effected at a constant rate.
Claim 10
Dependent Claim
17 words
A method of Claim 1, in which the rate of the insertion is 0.1 to 6 mm/minute.
Claim 11
Dependent Claim
30 words
A method of Claim 1, in which the resin for welding is melted in a mold, and then the end part of the pleated filter is inserted into the mold.
Claim 12
Dependent Claim
39 words
A method of Claim 1, in which the welding is achieved by setting the end part and the resin for welding in a mold simultaneously, melting the resin for welding, and forcing the end part into the melted resin.
Claim 13
Independent Claim
135 words
A method of producing a filter element made wholly of a fluorocarbon resin which comprises superimposing a net supporter made of thermoplastic fluorocarbon resin on the both side of a filter membrane made of fluorocarbon resin to form a pleated sheet, bending the pleated sheet to cylindrical form, liquid-tightly welding the edge parts of adjacent sides of the sheet, inserting an end part of the obtained cylindrical pleated filter material into a thermoplastic fluorocarbon resin powder preveously charged into a mold which is fitted to the end part of filter. material, so that the powder is inserted into the spaces of the pleat at the end part, heating the mold to melt the powder and the net supporter of the end part whereby welding the end part by the melted resin, and then cooling them.
Claim 14
Independent Claim
135 words
A method of producing a filter element made wholly of a fluorocarbon resin which comprises superimposing a net supporter made of thermoplastic fluorocarbon resin on the both side of a filter membrane made of fluorocarbon resin to form a pleated sheet, bending the pleated sheet to cylindrical form, liquid-tightly welding the edge parts of adjacent sides of the sheet, inserting an end part of the obtained cylindrical pleated filter material into a thermoplastic fluorocarbon resin powder preveously charged into a mold which is fitted to the end part of filter. material, so that the powder is inserted into the spaces of the pleat at the end part, heating the mold to melt the powder and the net supporter of the end part whereby welding the end part by the melted resin, and then cooling them.
Claim 15
Dependent Claim
14 words
A method of Claim 12, in which the filter membrane is made of PTFE.
Claim 16
Dependent Claim
30 words
A method of Claim 12, in which at the welding of the side edges of pleated filter a tape made of thermoplastic fluorocarbon resin is inserted between the side edges.
Claim 17
Dependent Claim
17 words
A method of Claim 12, in which the net supporter is made of PFA, FEP or EPE.
Claim 18
Dependent Claim
18 words
A method of Claim 12, in which the resin powder is PFA, FEP, EPE, PCTPE, ECTFE or ETFE.
Claim 19
Dependent Claim
16 words
A filter element made wholly of fluorocarbon resin produced according to a method of Claim 1.
Claim 20
Dependent Claim
16 words
A filter element made wholly of fluorocarbon resin produced according to a method of Claim 12.
References Cited (Backward Citations)
No citation records indexed.
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