Method of making a stand-up plastic bag

Details Method of making a stand-up plastic bag Method of making a stand-up plastic bag

1990-06-05

1991-03-05

Terrell, William E.

Manufacturing container or tube from paper; or other manufacturi

Container making

Pliable container

493189, 493195, 493341, 1563084, 1563096, B31B 3764

Patent

active

049974165

ABSTRACT:
An improved method of making a stand-up plastic bag in which heated pins are used to seal the gusset walls. The pins are heated at a temperature lower than melting point of the thermoplastic which forms the exterior contiguous portions of the gusset walls. The method includes the steps of supplying the film, folding the film to form the gusset, forming the heat seals for the gusset walls and the heat seals for the side seams at one temperature, forming the heat seals joining the gusset walls together at the same temperature using a heated pin seal bar, and separating the film into completed bags. The improved method provides greater efficiency and increased production rates.

REFERENCES:
patent: 2395077 (1946-02-01), Southwick

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