Methods of compression molding two or more polytetrafluoroethyle

Details Methods of compression molding two or more polytetrafluoroethyle Methods of compression molding two or more polytetrafluoroethyle

1993-06-18

1995-03-21

Kuhns, Allan R.

Plastic and nonmetallic article shaping or treating: processes

Forming articles by uniting randomly associated particles

Stratified or layered articles

264122, 264127, B29C 4320

Patent

active

053993071

ABSTRACT:
Methods of compression molding powdered polytetrafluoroethylene resins to produce composite articles of manufacture having at least two distinct layers of two types of PTFE resin are disclosed. A first layer of resin, preferably including a filler, is placed in a compression mold and partially compressed at a relatively low pressure. A second layer of resin, preferably virgin resin, is then added to the mold and both layers are simultaneously fully compressed. After compression, the resulting composite preform is preferably sintered and coined to create a finished PTFE material or product. In a preferred embodiment, the partial compression step is performed at pressures of less than 500 psi. It has been found that modified PTFE resins provide improved resistance to cold flow and also provide better binding between filled and unfilled (virgin) layers and thus are used in certain preferred embodiments.

REFERENCES:
patent: 3501360 (1970-03-01), Mancel
patent: 3629383 (1971-12-01), Kometani et al.
patent: 4615933 (1986-10-01), Traut
patent: 5064593 (1991-11-01), Tamaru et al.

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