| 摘要 |
A process is provided for the production of fire resisting pile fabrics by the conversion of readily flammable precursor pile fabrics, which comprise entirely of polyacrylonitrile fibres in the pile, into pile fabrics which then consist substantially of so called oxidised polyacrylonitrile fibres in the pile. This is effected by subjecting the pile fibres of the precursor pile fabric to the hot drawing action of a rapidly rotating heated and fluted roller followed by the heating of the pile fabric in air at a temperature of 225 +/-5 degrees Celsius for a period of from 5 hours to 7 hours. Pile fabrics so treated incandesce under incident flame. There is little smoke release or fibre melting. The excellent initial properties of thermal insulation and resistance to attack by microorganisms are retained. Pile fabrics so treated retain these desirable properties following exposure to severe elemental conditions and following repeated field maintenance procedures such as washing and dry-cleaning. |
