Method of forming a thermoplastic film sack having a stress reli

Details Method of forming a thermoplastic film sack having a stress reli Method of forming a thermoplastic film sack having a stress reli

1985-04-22

1986-05-13

Husar, Francis S.

Manufacturing container or tube from paper; or other manufacturi

Container making

Pliable container

383903, 493226, 493232, 493267, 493926, B31B 164

Patent

active

045883920

ABSTRACT:
A plastic film sack having gussetted side walls, and in the bottom of said sack, a heat-seal stripe welding together the four film layers in the gusseted regions of the sack and a heat seal stripe welding together the two film layers between said gusseted regions; and between the heat-seal stripes of the four film layers and the heat-seal stripe of the two film layers are unsealed, arcuate stress-relief regions and the method of forming the same.

REFERENCES:
patent: 3485437 (1969-12-01), Gruentzel et al.
patent: 4165832 (1979-08-01), Kuklies et al.

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