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US 4,961,891 AGranted
Method of making high compressibility gasket material
AssigneeGarlock Inc.
InventorStefan Pitolaj
Life of this patent
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Abstract
A highly compressible gasket material is formed by fusing two filled sheets of PTFE containing dispersed microballoons to a central unfilled sheet of PTFE which provides tensile strength to the material. The two unfilled sheets each constitute from 20% to 25% of the overall thickness of the gasket material. This method provides a unitary gasket assembly having an overall compressibility of 45% or more, but the thicker unfilled PTFE central area of the assembly provides excellent recovery characteristics and resistance to creep relaxation.
Claims9
A method for forming a gasket material which includes:
- forming first and second sheets of unsintered polytetrafluoroethylene having fully embedded, hollow, rigid collapsible particles dispersed therein and bonded thereto,
- forming a third sheet of unsintered polytetrafluoroethylene,
- positioning said third sheet between said first and second sheets to form a three layered structure,
- sintering said three layered structure at temperatures above the gel point of polytetrafluoroethylene to fuse the three layers into a unitary gasket structure.
1 more element
Dependencies are inferred from the claim text.