Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1992-10-27
1994-12-06
Ryan, Patrick J.
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
428244, 428245, 428253, 428254, 428323, 428367, 428373, 428377, 428428, 87 1, 87 6, 87 8, D06D 700, B32R 2700, D02G 300, D02G 302
Patent
active
053709268
ABSTRACT:
A packing material having improved chemical resistance formed of poly(phenylene) sulfide yarn and polytetrafluoroethylene yarn is provided. Each of the yarns may be treated with PTFE dispersion and, optionally, with graphite. The two yarns may be twisted together or laid-up side-by-side and braided together and the structure may be impregnated with a polytetrafluoroethylene based binder and lubricant. The resulting packing material has improved temperature characteristics, heat transfer characteristics, wear resistance, provides a dense impervious packing and is dimensionally stable in addition to the improved chemical resistance. A packing material prepared from yarns treated only with a PTFE dispersion is especially useful in the paper making industry and for other applications wherein dark colored yarns are not permissible.
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Ryan Patrick J.
The Marlo Company International
Weisberger Richard
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