Process for producing sealing rings from expandable graphite

Details Process for producing sealing rings from expandable graphite Process for producing sealing rings from expandable graphite

1996-12-19

1998-08-18

Stucker, Jeffrey

Plastic and nonmetallic article shaping or treating: processes

With printing or coating of workpiece

Coating or impregnating workpiece before molding or shaping...

264122, 264127, 264130, 264131, 264440, 427457, 427458, 427475, 521915, B32B 326

Patent

active

057955182

ABSTRACT:
Expanded graphite sealing rings having particles of PTFE captured at least in a surface layer are disclosed. The sealing rings are produced by impregnating porous rings, cut from a sheet of low density expanded graphite, with a PTFE dispersion and then compressing the rings to a desired final density. Impregnation is accomplished in the presence of an electric field.

REFERENCES:
patent: 4042747 (1977-08-01), Breton et al.
patent: 5452904 (1995-09-01), Huber et al.
European Search Report for EP 96 11 9423 dated Apr. 7, 1997.

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