Electrically heatable sheet prepared by paper

Details Electrically heatable sheet prepared by paper Electrically heatable sheet prepared by paper

1989-05-26

1990-10-02

Envall, Jr., Roy N.

Electric heating

Heating devices

With heating unit structure

252511, H05B 334

Patent

active

049609793

ABSTRACT:
An electrically heatable sheet contains 3 to 20% by weight of carbon fibers and 97 to 80% by weight of natural pulp. The carbon fibers consist of at least two groups of different lengths, each of the carbon fibers of one group having a length of not shorter than 3 mm and shorter than 5 mm, each of the carbon fibers of the other group having a length of not shorter than 5 mm and not longer than 10 mm. The carbon fibers is selected from the group consisting of pitch type carbon fibers, polyacrylonitrile type carbon fibers and mixtures thereof. The sheet has a thickness of not thicker than 150 .mu.m and a basis weight of not larger than 55 g/m.sup.2.

REFERENCES:
patent: 4115917 (1978-09-01), Charon et al.
patent: 4250397 (1981-02-01), Gray et al.
patent: 4816184 (1989-03-01), Fukuda et al.
patent: 4874548 (1989-10-01), Hajovsky

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