Patent Number: 6,254,709

Title: Method of manufacturing a pipe liner bag

Abstract: A method of manufacturing a pipe liner bag which is composed of a tubular resin absorbent material having an outer surface covered with a highly air-tight plastic film and a hardenable resin impregnated in the tubular resin absorbent material. The method involves 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 the tubular resin absorbent material inside out such that a previous inner surface thereof appears outside, and welding or adhering a plastic film entirely or partially on the outer surface of the tubular resin absorbent material to air-tight seal the outer surface. The method can reduce a time required for a joining operation and simplifying a sealing operation after both ends of the strip-shaped resin absorbent material have been joined.

Inventors: Kamiyama; Takao (Hiratsuka, JP), Yokoshima; Yasuhiro (Ibaraki-Ken, JP), Endoh; Shigeru (Yasato, JP), Aoki; Hiroyuki (Tokorozawa, JP)

Assignee: Shonan Gosei-Jushi Seisakusho K.K.

International Classification: B29C 53/48 (20060101); B29C 53/00 (20060101); B29C 65/00 (20060101); B29C 65/56 (20060101); B29C 65/50 (20060101); B29C 65/62 (20060101); F16L 55/165 (20060101); F16L 55/162 (20060101); B32B 007/04 (); B32B 007/08 (); F16L 055/18 ()

Expiration Date: 07/03/2018