Flexible bags – With closure – Including closure flap which overlaps sidewall exterior when...
Patent
1999-04-01
2000-07-04
Pascua, Jes F.
Flexible bags
With closure
Including closure flap which overlaps sidewall exterior when...
383120, 229 8703, B65D 3324
Patent
active
060828986
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a bag produced from a thin pleated sheet provided with self-closing means.
2. Description of the Related Art
European Patent EP-0-631,560 describes packaging for containing loose products, produced from a thin sheet comprising asymmetrical pleats fixed at their ends, the pleated part being folded on itself perpendicularly to the direction of the pleats to form a simple base or a bellows-type base, leaving an opening whose edges are in line or offset. The pleated part is extended on each side by a non-pleated zone forming two walls which may be fixed to each other. This patent describes several methods of closing the packaging thus obtained: welding of the unpleated zones and one of the edges of which is sufficiently offset to be able then to serve as a flap when the bag is full; by a non-pleated zone of a length sufficient to produce a receptacle when the base is formed and the walls which constitute it are fixed at their ends, whilst the non-pleated part limiting the other end of the fold remains free. Closure is then obtained by unfolding the pleated part over the non-pleated part.
The first method of closure described above applies to a bag which is easily identifiable by the user, but requires the use of a locking means because the flap does not stay in place alone.
The second method of closure is self-locking, but its manipulation requires a manual manoeuvre which users need to learn.
BRIEF SUMMARY OF THE INVENTION
The aim of the present invention is to propose a self-locking closure for a bag produced from a pleated sheet of the same type as that described in European Patent EP-0-631,560, which is hereinafter called "cited patent".
BRIEF DESCRIPTION OF THE DRAWINGS
In the appended drawings:
FIG. 1 shows a pleated sheet folded perpendicularly to the direction of the pleats with a view to obtaining the self-closing closure according to the invention, but not yet fixed in the lateral unpleated zones in order clearly to show how the pleats forming the closure are positioned relative to one another;
FIG. 2 shows an exploded perspective view of the bag of which the pleats of the base provided with its self-closing closure according to the invention have been unfolded into an open position, in order to allow filling;
FIG. 3 shows an exploded perspective view of the bag of FIG. 2 with its self-closing closure in the closed position. The pleats have not been shown in this figure in order to make it more legible;
FIG. 4 shows a common length of the self-closing closure according to the invention, in accordance with a variant of the invention.
DETAILED DESCRIPTION OF THE INVENTION
The invention consists, on the basis of a pleated sheet 1 (FIG. 1) comprising asymmetrical pleats 2 fixed at their ends 3 and 13, in forming a simple or bellows-type base 4 by folding the sheet 1 perpendicularly to the asymmetrical pleats 2 to form the base 4, as described in the cited patent, in such a manner that the unpleated edges 5 of the pleated sheet 1, each forming a face 6 and 7, overlap. One of the edges of the pleated sheet 1, corresponding to the end 13 of the pleats 2, is folded inwards, perpendicularly to the direction of the pleats 2. This forms a first flap 8 whose unpleated edges 9 are fixed to those 10 of the face 6 to which it belongs. The pleats 2 are preferably fixed, at least on one face at the height of the fold 11 of the first flap 8, by adhering to each other the opposite walls in the hollow of each pleat so as to prevent this first flap 8, whose pleats 12 are fixed at least at the two ends 11 and 13, from unfolding during use. The unpleated edges 5 of the two faces 6 and 7 of the bag are fixed from the base 4 up to the height 14 of the end 13 of the first flap 8. A second flap 15 is formed by folding the other face 7 outwards, perpendicularly to the direction of the pleats 2, so that the fold 16 produced is located at the height 14 of the end 13 of the fixing of the unpleated edges 5 of the bag. The edges 17 of this secon
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patent: 5131586 (1992-07-01), Capy
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Buchberg Akiva
Capy Gilbert
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