Non-woven heating element
AssigneeInternational Paper Company
InventorsRobert G. Kraus, James R. Quick
Life of this patent
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Abstract
An electrically conductive non-woven web for a heating element is formed from a non-woven sheet comprising conductive fibers which is saturated with a dispersion comprising conductive particles. Embodiments adapted for use at low voltages and at household voltages are provided. In a preferred, flame-resistant embodiment, the heating element is a sandwich containing, from bottom to top, a first insulating non-woven sheet comprising polyaramid fibers, an electrically conductive web comprising carbon fibers, polyaramid fibers, and carbon black. A pair of conductive strip attached in electrical contact to the web, and a second insulating non-woven sheet comprising polyaramid fibers.
Claims13
An electrically conductive non-woven web for a heating element comprising, in combination, conductive fibers having melting points no lower than about 400.degree. F., electrical resistances no greater than about 25,000 ohm/cm, and lengths in the range of from about 1/8 inch to about two inches, and conductive particles, the conductive particles comprising from about 5% to about 50% of the final dry weight of the web.
An electrically conductive non-woven web for a heating element comprising a non-woven sheet saturated with from about 10% to about 67% by the final dry weight of the web of a dispersion comprising conductive particles and a polymeric binder, the non-woven sheet comprising conductive fibers having melting points no lower than about 400.degree. F., electrical resistances no greater than about 25,000 ohm/cm, and lengths in the range of from about 1/8 inch to about two inches, and the conductive particles comprising from about 5% to about 50% of the final dry weight of the web.
Dependencies are inferred from the claim text.