초록 ▼

A soft and flexible thin heating element is made of strong, light and non-metallic yarns. The heating element comprises electrically conductive carbon/graphite containing fibers, woven or stranded into the strips, ropes, sleeves or strands of threads. The selected areas of the heating element core a

A soft and flexible thin heating element is made of strong, light and non-metallic yarns. The heating element comprises electrically conductive carbon/graphite containing fibers, woven or stranded into the strips, ropes, sleeves or strands of threads. The selected areas of the heating element core are modified to impart additional electrical properties. An optional positive temperature coefficient (PTC) material is incorporated into said selected areas. The electrode conductors are attached to said heating element core which is electrically connected in parallel or in series. The heating element core is shaped in a desired pattern. The whole assembly is sealed by at least one electrically insulating layer which envelops the strips, ropes, sleeves, or strands of threads.

대표청구항 ▼

[ We claim:] [1.] A heating element comprising:electrically conductive nonmetallic yarns, including at least carbon fibers, assembled into a soft material of continuous longitudinal shape during textile fabrication; said soft material is cut to a predetermined length and laid out into a predetermine

[ We claim:] [1.] A heating element comprising:electrically conductive nonmetallic yarns, including at least carbon fibers, assembled into a soft material of continuous longitudinal shape during textile fabrication; said soft material is cut to a predetermined length and laid out into a predetermined pattern;a conductive means for introducing an electrical current to said soft material;an insulating means for insulating said electrically conductive soft material with at least one layer of nonconductive means; andconditioned local spots for providing diversity and control of electrical resistance in selected areas of said soft material.