Flexible bags – Dispensing feature
Patent
1988-03-30
1989-11-21
Little, Willis
Flexible bags
Dispensing feature
383120, F16C 3206
Patent
active
048818259
ABSTRACT:
In a container (1) of flexible material and including a tube-shaped blank divided into two opposite side walls (5) and two intermediate pairs of gusset walls (6) by means of gussets (2, 3), and having at least one block bottom (8, 9), a tightly sealed, outwardly folding discharge valve (11) is provided in the block bottom (8), said discharge valve being resealable and provided with a gripping means (16). The opening of the valve is formed by shortening a part of the floded end area to predominatly the same length as the depth (19) of the guesset (2).
When manufacturing the container (1) from tubing, it is gusseted and divided into blanks corresponding to the container. Then a part of the end area of the blank is cut along a first intersection parallel and adjacent to the middle fold (7) in one of the gussets (2) when the blank is folded up, and along a second, transverse intersection (23) one gusset depth (19) apart from the fold lines (25) around which the final folding of the side walls is performed, whereupon the block botton (8) is folded, while optionally mutually glueing or welding the folded side walls. Only the parts of the block bottom (8) not in touch with the gusset walls (6) with the cutout optionally glued or welded.
The resulting container with block bottom has a well functioning resealable discharge valve and is suitable for manufacture in a continuous process from an endless material without use of extra material.
REFERENCES:
patent: 1623107 (1927-04-01), Goodykoontz
patent: 3367380 (1968-02-01), Dickey
patent: 4071187 (1978-01-01), Lafleur
patent: 4452378 (1984-06-01), Christine
patent: 4685148 (1987-08-01), Titchenal
Little Willis
Unibag A/S
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