Sheet electrical heating element

Abstract

A sheet electrical heating element comprising warp yarns which are constituted of a plurality of warp electrically conductive yarns disposed at predetermined intervals and a plurality of warp electrically non-conductive yarns, one or more of which are arranged in each of said intervals of the warp electrically conductive yarns; and weft yarns which are constituted of a plurality of adjacent weft electrically non-conductive yarns and a weft woven electrode of predetermined length in the warp direction. The woven electrode is constituted of weft electrically conductive yarns forming fancy twill weave together with the warp yarns so that the texture may be loose and flexible. The weft electrically conductive yarns are constituted of a core yarn, an inner strip of copper foil which is spirally coiled around the core yarn in one direction, and an outer strip of copper foil which is coiled on the inner copper foil so as to cross the inner copper foil so that great folding endurance may be obtained and that the woven electrode may have great capacity of the electric current.

Dependencies are inferred from the claim text.