| abstract |
Aliphatic polyamide filament yarn fabrics and aromatic polyamide filament yarn fabrics are respectively dipped into a solution of resin, dried, made into prepregs, cut into proper size, stacked with aliphatic polyamide prepregs as the outer layers and aromatic polyamide prepregs as the inner layers to the extent of a predetermined thickness, and heated and pressurized, wherein the aliphatic polyamide filament yarn fabrics are heat-treated, and then the aliphatic polyamide filament yarn fabrics and aromatic polyamide filament yarn fabrics are pre-heated prior to dipping into a solution of the resin. The article may be a bulletproof helmet. |