Method and apparatus for producing self-standing bags

Details Method and apparatus for producing self-standing bags Method and apparatus for producing self-standing bags

1976-05-04

1977-10-25

Coan, James F.

93 33H, B31B 3174

Patent

active

040551091

ABSTRACT:
A self-standing bag is made of two similar side wall sheets disposed in an opposing relation and a bottom wall sheet having two edges thereof heat-fused with the lower edges of the two side wall sheets and being folded along a central folding line into the interspace between the two side wall sheets to have an inverted V-shaped cross section, each of the two lateral edges of the bottom wall wheet being recessed from the lateral edges of the side wall sheets, whereby two lateral edges of the two side wall sheets are mutually joined directly, when subjected to heat-fusing operation, to form two-ply lap joints. The invention also provides method and apparatus for automatically producing the bag. SP

REFERENCES:
patent: 2759400 (1956-08-01), Randall
patent: 2961930 (1960-11-01), Wamsley et al.
patent: 3380646 (1968-04-01), Doyen et al.
patent: 3537360 (1970-11-01), Farnam
patent: 3566756 (1971-03-01), Schmid
patent: 3884129 (1975-05-01), Monohan

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