Patent ID: 7275869

Claim:
A removable inner bag for a transport tank, comprising: a synthetic-resin multilayer tubular film being constituted of an outer tubular film and an inner tubular film to be inserted into said outer tubular film, and being at least doubled with said outer and inner tubular films, the a synthetic-resin multilayer tubular film having opposing ends along a direction in which the inner tubular film is inserted into said outer tubular film; a synthetic-resin reinforcing film to be put on corner portions at both ends of said multilayer tubular film; a welding line where each of the opposing ends of said multilayer tubular film are welded together with said reinforcing film, the welding line sealing said each of the opposing ends to form said multilayer tubular film in an envelope type bag shape; and a second supply-discharge opening, fitting in a first supply-discharge opening disposed in a lower portion of said transport tank, being welded to a peripheral edge of a hole which is formed in said multilayer tubular film before forming said welding line, wherein said reinforcing film is folded and disposed to sandwich a portion constituted only of said outer tubular film at both ends of said welding line.