Method of manufacturing flexible gaskets which withstand chemical agents
AssigneeValois SAS
InventorPierre Lugez
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Abstract
In order to manufacture sealing gaskets for receptacles containing aggressive chemical substances, one known technique consists in coating a film of PTFE or other plastic material onto rubber. However, in the past, it has been possible to ensure that the film adheres adequately to the rubber only by making use of an intermediate glue. The present method causes a film of PTFE to adhere directly on a sheet of rubber by treating one of the faces of the PTFE film by the corona effect and then rolling the treated film against the rubber while still raw and vulcanizing the resulting laminated structure.
Claims5
A method of manufacturing a flexible gasket which withstands chemical attack from fluid substances, said method consisting in applying at least one film of PTFE (polytetrafluoroethylene) directly onto a sheet of raw rubber and in subjecting said sheet of rubber together with said film of PTFE to heating and to pressure suitable for causing said rubber to vulcanize, wherein said film of PTFE is previously treated by a corona effect which comprises bombarding said film with a corona discharge on that one of its two faces which comes into contact with said sheet of rubber.
Dependencies are inferred from the claim text.