Method for making plastic bags

Details Method for making plastic bags Method for making plastic bags

1973-05-18

1977-08-16

Coan, James F.

93DIG1, B31B 3160

Patent

active

040418510

ABSTRACT:
The invention provides a novel method of making a plastics bag and a novel plastics bag, the method comprising folding a sheet of plastics material to form a U-shaped blank, welding the longitudinal edges of the blank, and providing either two or four weld seams at the base of the bag to provide a bottom wall defined at least in part by said seams, said seams serving to give the bag stability whereby it may be stood on said bottom wall. The top of the bag may be closed in various ways, for example by straight or inclined weld seams and a funnel like pouring spout may be provided if desired.

REFERENCES:
patent: 3006257 (1961-10-01), Orsini
patent: 3334553 (1967-08-01), Hewitt et al.
patent: 3380646 (1968-04-01), Doyen et al.
patent: 3412918 (1968-11-01), Sherman
patent: 3431829 (1969-03-01), Goodwin
patent: 3654841 (1972-04-01), Davis, Jr.

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