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

1983-08-24

1984-09-11

Mayewsky, Volodymyr Y.

Electric heating

Heating devices

With heating unit structure

29611, 20415917, 219528, 219549, 264105, 338 22R, 252511, H05B 32

Patent

active

044712154

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.

REFERENCES:
patent: 3858144 (1974-12-01), Bedard et al.
patent: 3861029 (1975-01-01), Smith-Johannsen et al.
patent: 3914363 (1975-10-01), Bedard et al.
patent: 4188276 (1980-02-01), Lyons et al.
patent: 4277673 (1981-07-01), Kelly
patent: 4286376 (1981-09-01), Smith-Johannsen et al.
patent: 4309596 (1982-01-01), Crowley
patent: 4327480 (1982-05-01), Kelly
patent: 4334148 (1982-06-01), Kampe
patent: 4334351 (1982-06-01), Sopory

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