Composite PTFE article method of manufacture
OwnerBruce G. Ruefer, Leonard G. Marlow JR. +2inventors
InventorsBruce G. Ruefer, Leonard G. Marlow JR., Rebecca U. Ruefer, N. Joe Sharber
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Abstract
A method of producing a polytetrafluoroethylene (PTFE) material including the steps of extruding a first material to form a first extrudate, and extruding a second PTFE material to form a second extrudate, wherein the first PTFE material is more expandable than the second PTFE material. A stack is formed from at least one layer of the first extrudate and at least one layer of the second extrudate, and the stack is expanded and sintered to form the article.
Claims15
A method of producing a composite expanded polytetrafluoroethylene (PTFE) material comprising the steps of:
- extruding a first PTFE material to form a first extrudate;
- extruding a second PTFE material to form a second extrudate, wherein the first PTFE material is more expandable than is the second PTFE material;
- forming a stack from at least one layer of the first extrudate and at least one layer of the second extrudate;
- and
- expanding the stack to form the composite expanded article.
A method of producing a composite expanded polytetrafluoroethylene (PTFE) material comprising the steps of:
- extruding an expandable first PTFE material to form a first extrudate;
- extruding a less expandable second PTFE material to form a second extrudate;
- forming a stack from at least one layer of the first extrudate and at least one layer of the second extrudate;
- calendering the stack;
- drying the stack to remove mineral spirits from the first and second extrudates;
- expanding the stack to form the composite expanded article;
- and
- sintering the expanded article.
Dependencies are inferred from the claim text.