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AssigneeKurashiki Baseki Kabushiki Kaisha
InventorsTokuya Miyagi, Akihisa Inoue, Katushi Hamada, Shoichi Fujimori, Yoshihiro Hori
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The present invention provides a filter element made wholly of fluorocarbon resin, including 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 production thereof. The filter element of the present invention is characterized in that materials for the element are wholly a fluorocarbon resin, so that problems of chemicals resistance, temperature resistance and metal leaching are not caused, and besides that fluorocarbon resins which have so far been regarded as difficult to weld together, are in a liquid-tightly welded state by the special constitution.
A filter element consisting of fluorocarbon resin elements and comprising as essential elements a filter material produced by folding a sandwich-form sheet comprising a filter membrane made of tetrafluoroethylene resin (PTFE) and net supporters made of tetrafluoroethylene/perfluoroalkyl vinyl ether copolymer resin (PFA), tetrafluoroethylene/hexafluoropropylene copolymer resin (FEP) or tetrafluoroethylene/hexafluoropropylene/perfluoroalkyl vinyl ether terpolymer resin (EPE) superimposed on the both surfaces thereof into a pleat form and liquid-tightly welding the edges parts of the both sides of the pleated sheet, sealed end parts produced by embedding the both end part of said filter material except the central openings into a thermoplastic fluorocarbon resin selected from the group consisting of PFA, FEP and EPE 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.
Dependencies are inferred from the claim text.