Production of lined valved bags

Details Production of lined valved bags Production of lined valved bags

1974-09-17

1976-03-16

Coan, James F.

93 8VB, 93 8W, B31B 3900

Patent

active

039438333

ABSTRACT:
A bag comprising an inner lining of plastics film and an outer layer of paper comprises a folded closure at least at one end. The folding of the inner lining is incorporated in the folding of the outer layer but is secured by means of separate adhesive. The inner lining and outer layer are made from respective flattened tube sections of which the inner tube section projects from the outer tube section at that end where the folded closure is to be made. During one stage in the folding of the end closure, a tongue formed in the projecting part of the inner tube section is turned over so that at this position the inner tube section is set back from the corresponding edge of the outer tube section.

REFERENCES:
patent: 3133480 (1964-05-01), Gerard
patent: 3473446 (1969-10-01), Berghgracht
patent: 3530774 (1970-09-01), Booth et al.
patent: 3540356 (1970-11-01), Lecomte
patent: 3724340 (1973-04-01), Brockmuller

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