Patent ID: 6254709
Filing Date: 2001-07-03
Classification: B29C,B29K,B29L,F16L

Abstract:
A method of manufacturing a pipe liner bag comprising a tubular resin absorbent material having an outer surface covered with a highly air-tight plastic film and a hardenable resin impregnated in said tubular resin absorbent material, said method comprising the steps of:folding a strip-shaped resin absorbent material and aligning both ends thereof in the width direction;straight sewing overlapped portions to form a tubular resin absorbent material while leaving a sewing margin;turning said tubular resin absorbent material inside out such that a previous inner surface thereof appears outside; andaffixing a plastic film at least partially on the outer surface of said tubular resin absorbent material to air-tight seal said outer surface.