H - Electricity – 05 – B
Patent
H - Electricity
05
B
309/100, 18/69
H05B 3/18 (2006.01) B29C 61/06 (2006.01) B29C 61/10 (2006.01) B29C 65/34 (2006.01) F16L 47/22 (2006.01) H05B 3/36 (2006.01) H05B 3/58 (2006.01)
Patent
CA 1157073
ABSTRACT OF THE DISCLOSURE An electrical heating element material of a sheet form is provided, which is comprised of a web of a thermoplastic resin having a plurality of metal conductor wires arranged therein in parallel to one another along the longitudinal direction of the web. The web is folded in succession at predetermined intervals along folding lines inclined at an acute angle of .5 to 10 degrees to the transverse direction of the web to form a two-layer rectangular sheet. The electrical heating element material is prepared by supplying a plurality of metal conductor wires arranged in parallel to one another into a cross-head type extrusion die, separately supplying a thermoplastic resin into said die, co-extruding the resin together with the wires to form a web, folding the web in succession at predetermined intervals along folding lines inclined at an acute angle to the transverse direction of the web to form a two-layer rectangular sheet, and then, optionally, bonding together the two layers. The electrical heating element material may be used as a heat-shrinkable cover, which is comprised of a heat- shrinkable synthetic resin member and the electrical heating element material combined with the heat-shrinkable resin member substantially over the entire region thereof.
357986
Nagasawa Toshio
Nishihara Yoshio
Johnson & Hicks
Ube Industries Ltd.
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