Fabrication of reinforced PTFE gasketing material
US4913951A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 26, 1988 |
| Grant date | Apr 3, 1990 |
| Priority date | — |
| Expiry date | Jul 26, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24347
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A reinforced composite gasketing material characterized by high strength and dimensional stability, excellent recovery and superior creep relaxation resistance properties and a process for producing such a gasketing material are provided. The composite gasketing material of the present invention is a multiple layer laminate of filled polytetrafluoroethylene (PTFE) and at least one ply of perforated stainless steel. The process of the present invention includes the steps of pressure sintering alternately layered sheets of a PTFE/filler blend and stainless steel by the application of a sequence of intervals of pressures and temperatures selected primarily according to the thickness desired in the finished material and then rapidly cooling the sintered composite under pressure. The resulting gasketing material has the metal layer completely encapsulated by and bonded to the PTFE/filler material. The process of the present invention can be used with equal facility to produce gasketing material in sheet form from which individual gaskets can be cut or in the form of individually molded gaskets. One embodiment of the present invention provides a gasketing material characterized by high c…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.