Flexible bags – With closure – For access opening in bag bottom
Patent
1995-11-27
1998-01-06
Pascua, Jes F.
Flexible bags
With closure
For access opening in bag bottom
383 84, B65D 3318
Patent
active
057047146
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a flexible tubular bag for hygienic articles, in particular a pile of cotton pads, comprising a sidewall which forms a cylindrical bag and a front wall provided with an outlet, the walls being formed of a single foil web, as well as to a method for producing the flexible tubular bag from a continuously unwound foil web.
2. Background Art
Flexible tubular bags of the generic type involve the problem that the hygienic articles may leave the outlet inadvertently, because as a rule the outlet is disposed on the front wall that forms the bottom of the flexible tubular bag. The reason for this resides in that a suspension means in the form of a string is provided at the upper end of the flexible tubular bag so that the bag can be hung up as a sort of a dispenser and the cotton pads it contains can be removed successively from the outlet at the bottom.
A fundamental problem resides in that the contents of the bag may gradually become soiled by impurities or dust entering through the outlet.
SUMMARY OF THE INVENTION
Proceeding from the drawbacks of prior art flexible tubular bags, it is the object of the invention to further develop a flexible tubular bag of the species in such a way that reliable protection of the contents from soiling is ensured. Simultaneously, this further development aims at not substantially increasing the manufacturing requirements, because flexible tubular bags are typical mass goods.
This object is attained in that a covering flap set on the sidewall and/or the front wall is provided for covering the outlet, the surface of which covering flap may be detachably joined to the flexible tubular bag. As regards the method of production, this object is attained by the steps of doubling the foil web for two foil layers to form, one lying on top of the other, which are united, on the side of the rim, by a doubled edge extending in the direction of unwinding; asymmetrically folding the foil layer arrangement from the doubled edge of the two foil layers, which results in the forming of a short front wall fold directed inwardly and a prolonged flap fold extending between the latter and the foil layer; and welding and separating the foil layer arrangement, thus forming the sidewall out of the two foil layers, the front wall out of the front wall fold, and the covering flap out of the flap fold. Accordingly, the flexible tubular bag comprises a flap for covering the outlet, this covering flap being set on the sidewall and/or front wall of the bag so as to form a single piece therewith. For securing the covering flap in its position of covering, the surface of the flap may be detachably joined to the tubular bag for instance by means of an adhesive zone or a sticker adhesive on both sides, which may be applied on the flap or on the bag in the form of a pressure-sensitive adhesive that is sprayed on.
Because of this covering flap, the outlet can be dosed again at any time, soiling of the hygienic articles by the intrusion of dust, moisture or the like into the interior of the bag being avoided as well as any inadvertent removal of articles.
Due to the fact that the covering flap forms a single piece with the flexible tubular bag, the bag is very easy to manufacture because no separate foil blank for the covering flap must be attached.
Further features, details and advantages of the invention will become apparent from the ensuing description of an exemplary embodiment, taken in conjunction with the drawing.
BRIEF DESCRIPTION OF THE DRAWING
FIG. 1 is a perspective view of a flexible tubular bag according to the invention,
FIG. 2 is a section through the flexible tubular bag on the line II--II of FIG. 1,
FIGS. 3A-C are sections through a foil web at right angles to the direction of unwinding in a sequence of intermediate stages during the production of the flexible tubular bag, and
FIG. 4 is a plan view of a flexible tubular bag lying flatwise, as it can be obtained by welding and cutting from the foil web according to FI
REFERENCES:
patent: 3227359 (1966-01-01), Hanlon
patent: 4260061 (1981-04-01), Jacobs
patent: 4786190 (1988-11-01), Van Erden et al.
patent: 5333735 (1994-08-01), Focke et al.
Pascua Jes F.
The Procter & Gamble & Company
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