Tubular bag and method of making the same

Details Tubular bag and method of making the same Tubular bag and method of making the same

1981-03-10

1984-07-17

Price, William

Flexible bags

End structure

Formed by folding bag walls on common fold line and joining...

383 3, 383113, 426113, B65D 3322

Patent

active

044610319

ABSTRACT:
A tubular web has a bottom which is tightly sealed to enable pressurizing of the bag, the bottom including a first band of thermosetting glue imprinted across the length of the web at the interior of the tube. A second band and a third band of thermosetting glue are imprinted on the tube at the exterior thereof in registry with the ends of the first band and jointly extend across a rear panel. The tube has a turned up bottom defined by a fold along a line extending centrally along the imprinted bands, each portion of the thermosetting glue bands being thermally fused only to other portions of such bands in contact therewith. In one embodiment, there is a second fold along a second line spaced from the turned up bottom which defines an area between the second line and the turned up bottom, such area being joined by glue to the back panel. A back seam extends into the bottom and includes an inner layer of grease-proof paper and an outer layer of different paper, each paper glued to itself along marginal edges that are spaced apart.

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patent: 3478952 (1969-11-01), Perlman
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patent: 3623653 (1971-11-01), Work
patent: 3973045 (1976-08-01), Brandberg et al.
patent: 4249978 (1981-02-01), Baker

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