Self-regulating heating cable having radiation grafted jacket

Details Self-regulating heating cable having radiation grafted jacket Self-regulating heating cable having radiation grafted jacket

H - Electricity

05

B

309/85

H05B 3/54 (2006.01) H01C 17/02 (2006.01) H05B 3/56 (2006.01)

Patent

CA 1212407

ABSTRACT OF THE DISCLOSURE Disclosed is a method of radiation grafting a shape retaining jacket (32) made from an elastomeric polyurethane to an olefinic semi-conductive composition (30) 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 (32) and the olefinic semi-conductive composition (30) arising from radiation grafting in a process that includes a means (14) of oxidizing the outer surface of the semi-conductive composition (30) in combination with application of vacuum able to draw the jacket (32) against the semi-conductive composition (30) within not more than about one and one-half inches from the exit (26) of a die head (4) through which the product (6) is passed.

455871

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