Self-regulating heating cable having radiation grafted jacket
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United States of America Patent
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-
Sep 11, 1984
Grant Date -
N/A
app pub date -
Aug 24, 1983
filing date -
Aug 24, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Disclosed is a method of radiation grafting a shape retaining jacket (32) made from an elastomeric polyurethane to an olefinic semi-conductive composition electrically interconnecting at least two elongate spaced-apart conductors (28) to provide an improved, flexible, elongate semi-conductive heating cable (8) that is provided with improved mechanical and electrical integrity and diminished imperfections and improved handling characteristics by reason of a substantially improved bond between the jacket and the olefinic semi-conductive composition arising from radiation grafting in a process that includes a means (14) of oxidizing the outer surface of the semi-conductive surface in combination with application of vacuum able to draw the jacket against the semi-conductive composition within not more than about one and one-half inches from the exit of a die head (4) through which the product is passed.
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