Importance

Loading Importance Indicators...

Abstract

A method for manufacturing a liner bag used for lining used underground pipes: (i) a long tube of a rectangular resin absorbent sheet, whose outer face is hermetically coated with a plastic film, is formed with a long cavity along the entire length of its seam by attaching a first reinforcer cover strip to the inner face of the resin absorbent sheet tube across the seam by welding only the lateral long side portions thereof; (ii) a second reinforcer strip is fixed in the long cavity by welding it to the resin absorbent sheet and the first reinforcer strip in a manner such that the second reinforcer strip is trapped between the resin absorbent sheet and the first reinforcer strip at a location underneath the seam; (iii) then, a first adhesive tape is applied to the surface of the plastic film in a manner so as to cover up the entire length of the seam and a wider second adhesive tape is applied to the surface of the plastic film over the first adhesive tape, the back of the first adhesive tape having a releasing characteristic with respect to the adhesive element of the second adhesive tape; furthermore, in the case of a double-layer bag, the inner layer is pleated at two diagonal positions.

Loading the Abstract Image...

First Claim