Inner bag for transport tank and producing method thereof

Details Inner bag for transport tank and producing method thereof Inner bag for transport tank and producing method thereof

2007-10-02

2007-10-02

Newhouse, Nathan J. (Department: 3782)

Flexible bags

Wall details

Multi-layer or ply

C383S107000, C383S114000

Reexamination Certificate

active

11038145

ABSTRACT:
An inner bag for a transport tank is constituted of a doubled tubular film in which a tubular film is inserted into another one. An inner bag supply-discharge opening is thermally welded to an attachment hole formed in the doubled tubular film. When thermally welding one end of the doubled tubular film, a reinforcing film is put on a two-layered portion constituted only of an outer tubular film, so that the two-layered portion has the same thickness as a four-layered portion constituted of the outer and inner tubular films. Thereby, the whole thermal welding line has approximately uniform thickness such that the thinner portion dose not exist. This will prevent the deterioration in sealing property, strength and durability of the thermal welding line caused by rubbing of the thinner portion during transporting and or the application of welding energy to the thinner portion.

REFERENCES:
patent: 3768724 (1973-10-01), Hill
patent: 3956045 (1976-05-01), Hoffman
patent: 4658433 (1987-04-01), Savicki
patent: 5066290 (1991-11-01), Measells et al.
patent: 50-4615 (1975-01-01), None
patent: 57-46492 (1982-03-01), None
patent: 61-48190 (1986-03-01), None
patent: 61-104983 (1986-05-01), None
patent: 2001-354292 (2001-12-01), None

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