Compression molding two or more polytetrafluoroethylene resin la

Details Compression molding two or more polytetrafluoroethylene resin la Compression molding two or more polytetrafluoroethylene resin la

1994-12-05

1997-09-23

Weber, Thomas R.

Plastic article or earthenware shaping or treating: apparatus

Press forming means, press reshaping means, or vulcanizing...

Cooperating endless belts

425DIG55, 428422, 4289088, B29C 3916

Patent

active

056701896

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.

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