Flexible bags – With closure – Gathered bag mouth
Patent
1996-03-05
1998-02-10
Pascua, Jes F.
Flexible bags
With closure
Gathered bag mouth
383 10, 383109, 493225, B65D 3328
Patent
active
057161372
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS
This application is the US national phase of PCT application PCT/EP95/03381 filed 26 Aug. 1995 with a claim to the priorities of German application P 44 31 977.0 Filed 8 Sep. 1994 and P 44 33 582.2 filed 21 Sep. 1994.
FIELD OF THE INVENTION
The invention relates to a bag of a thermoplastic synthetic-resin foil with front and back walls connected at side weld seams, a fill opening extending over the entire width of the bag, adjacent thereto a draw strip connecting the side weld seams with the bag, an well as a hand hole partially exposing the draw strip.
BACKGROUND OF THE INVENTION
A bag of the described type is known in many different types. Thus for example German patent 3,821,905 describes a method of making bags with draw strips of thermoplastic resin foil where a draw strip is set into a welded seam formed by a folded-over edge at the fill opening and the seams are joined together with side weld seams. A hand hole in the middle of the seams allows one to grab the strip and carry the bag. With these standard bags the welding of the free end of the folded-over portion on the single-ply front wall and back wall of the bag forms a thin spot which is loaded when the bag is completely filled. The draw strip fixed on the bag is only secondarily held by the side weld seams. According to what is in the bag or its weight these standard bags are easily torn at the region of this thin spot so that this type of bag can only be used it is to be filled with light materials or the foil material and foil thickness are correspondingly selected for heavier contents.
OBJECT OF THE INVENTION
It an object of the invention to provide a bag of plastic foil a draw strip which in spite of relatively thin foil thickness is quite strong. In addition the bag should be able to be fully manufactured at a high production speed.
SUMMARY OF THE INVENTION
The objects of the invention are attained by a bag wherein the wall and the back wall are each formed by a respective inner and outer foil layer and a draw strip is provided between the foil layers of the front wall and back wall.
Such a bag can better stand being heavily loaded by its contents since the load of the contents is effective at first on the side seams in the region of the welded-in draw strip. In addition rials are economized since the otherwise necessary folded over seam need not be provided on the bag opening and in addition the can be thinner since as a result of how the load is carried foil layers together, not just the foil thickness of one layer, ed not correspond the wall thickness of a standard one-ply bag.
For best load-carrying capacity, the foil layers of the front wall and of the back wall are joined together in the outer-lying edge of the fill opening each by a longitudinal weld seam.
With the bag made according to the invention as described above the inner and outer foil layers are not only thinner than with the standard bags, but they can be specially selected according to the intended contents, that is for example formed of different plastics and/or of different thicknesses. Thus the usability of the bag according to the invention is substantially increased.
For simplification reasons the draw strip formed of a plastic foil is the same material as the inner or outer foil layer of the front wall and/or of the back wall.
Even the position and formation of the hand hole for partially exposing the draw strip plays a substantial role for the bag according to the invention. According to a preferred embodiment of the invention the hand hole situated in the region of the draw strip is formed narrower in the region of the fill opening than in the region of the draw strip. Thus the application of force to the draw strip or on the bag walls in the region of the fill opening is improved.
This is particularly the case when the hand hole is formed by a generally circular cutout whose center lies generally at the half height or width of the draw strip and whose opening takes up less than 180.degree. of the region of the
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patent: 4547237 (1985-10-01), Hendrickson
patent: 4813792 (1989-03-01), Belmont et al.
patent: 4878764 (1989-11-01), Meyer
patent: 5161895 (1992-11-01), Myers
Dubno Herbert
Lemo Maschinenbau GmbH
Pascua Jes F.
Wilford Andrew
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