Paper making and fiber liberation – Processes and products – Electrical or magnetic product characteristic
Patent
1990-02-20
1993-01-19
Chin, Peter
Paper making and fiber liberation
Processes and products
Electrical or magnetic product characteristic
162145, 162146, 1621571, 1621681, 264 292, 264 297, 4234471, 4234472, 4234478, 428224, 428408, 428409, D21H 1350
Patent
active
RE0341622
ABSTRACT:
A method of manufacturing controlled surface electrical resistivity carbon fiber sheet products employing a carbonizable starting material, heating and drawing the starting material (if required), stabilizing and oxidizing the starting material if required at an elevated temperature of the order of 220 degrees Centigrade to effect molecular aromatic rearrangement of the starting material, partially carbonizing the oxidized starting material at [an] elevated temperature values in an oxygen free atmosphere within a furnace having an elevated temperature extending over a temperature range from about 370 degrees Centigrade to about 1400 degrees Centigrade [by soaking the]. The starting material is soaked at an elevated temperature for a predetermined period of time to provide a known preselected surface electrical resistivity to the partially carbonized material corresponding to that required to provide the preselected desired surface electrical resistance for the finished products. The partially carbonized material thus treated is formed into [end] carbon fiber sheet products [having] the form of paper, woven fabric and the like having a predetermined desired surface electrical [resistivity]resistance. The starting carbonizable material consists essentially of PAN.
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Chin Peter
Helzer Charles W.
Zoltek Corporation
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