NON-BACKED CLOTH FOR AIR BAGS AND METHOD FOR MANUFACTURING NON-BACKED CLOTH Russian patent published in 1999 - IPC

FIELD: textile industry. SUBSTANCE: non-backed cloth is made with web or reps interlacing of polyamide filament thread with fibril titer from 1.5 to 7 dtex, strength 50-80 cN/tex, and relative elongation 15 to 30%. Cloth is characterized by air permeability less than 3 l/sq.dm min, residual shrinkage on boiling less than 2%, and warp-shute separation force higher than 110 N. According to invention, starting material is polyamide filament with hot-air shrinkage less than 6% and minimum shrinkage force 0.20 cN/tex. Cloth is subjected to heat treatment in closed container at 80 to 160 C and relative air humidity 90 to 100%, dried on lengthening frame, and fixed or treated by widespread glazing or sanforset processes. EFFECT: simplified process. 3 cl, 3 ex