Multilayer seals and method for their production and joining to

Details Multilayer seals and method for their production and joining to Multilayer seals and method for their production and joining to

1977-03-31

1979-04-03

Van Balen, William J.

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

92103R, 92103SD, 428223, 428304, 428305, 428321, 428422, B32B 302

Patent

active

041478240

ABSTRACT:
Plastic seals for use in valves which handle chemically reactive and aggressive media are described. These seals have a base layer made from porous PTFE and a covering layer of smooth, dense PTFE. The two layers are suitably sintered together. The seal is held in a seal holder which may be injection molded around the seal and may be made from a similar material. During the production of the base layer, the PTFE material is mixed with a flushable filler material which leaves a structure of pores in the layer after removal. These pores impart to the base layer an elastic property.
A method for joining the seal to the seal carrier and a method for forming annular seals are also described.

REFERENCES:
patent: 2808484 (1957-10-01), Beck et al.
patent: 2867241 (1959-01-01), Fitz-Harris
patent: 2951721 (1960-09-01), Asp
patent: 3048537 (1962-08-01), Pall et al.
patent: 3134571 (1964-05-01), Boteler
patent: 3202733 (1965-08-01), Strauss

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