Inflatable foil sachet, especially for packaging purposes

Details Inflatable foil sachet, especially for packaging purposes Inflatable foil sachet, especially for packaging purposes

1993-09-08

1994-10-04

Garbe, Stephen P.

Special receptacle or package

Shock protection type

Inflated retainer

383 3, 383 44, 383 58, B65D 3324

Patent

active

053518284

DESCRIPTION:

BRIEF SUMMARY
DE-A 37 05 167 discloses a film bag made of thin plastic film having at least one chamber consisting of an upper and a lower film interconnected by a closed-line seam. A narrow tube having small dimensions compared to the chamber and likewise consisting of a thin film extends through all chambers of the film bag, remaining permeable for a filling medium, generally air, at the points of passage into the chamber at the seams. The tube itself has openings, e.g. perforations, through which air enters the chamber when the bag is filled. When the chamber is filled the film tube is compressed by the internal pressure in the chamber so that the openings automatically close.
The seams interconnecting the upper and lower films are preferably weld seams, whereby only the outer walls of the tube are welded to the films at the points of passage of the tube during the welding process while the film tube remains permeable to air at these points of passage. This can be effected by preparing the film tube in such a way that its inner walls are moistened e.g. with a medium which prevents such a welding, or by an additional thermal film within the tube which has a higher melting point than the material of the outer wall of the tube.
Further prior art is French patent no. 2.067.530 and French patent application no. 2.291.114.
A problem of known film bags is their proper closure, in particular when strong long-lasting forces or strong shock-like forces act on the bag. With conventional constructions at least part of the air in the foil bags can flow out, thereby reducing the packaging effect with respect to reliable holding and protection of the object. Also, their production is frequently complicated.
The invention is based on the problem of stating a film bag of the type in question whose production is simplified and which reliably prevents the filling medium, i.e. air, from flowing out under virtually all operating conditions.
This is achieved when the channel has portions connected with the chamber film which are situated near a seam in each chamber, and the openings into the chambers are provided there. The channel portions with the openings are preferably situated in the area of the corners of the chambers. They are therefore located in areas where the strongest curves and the most bends and folds, which repeatedly bend the channel, occur in the inflated film bag, so that the sealing effect is excellent.
It is particularly advantageous if the film bag is formed in such a way that the channel is divided into a main channel and a side channel branching off the main channel, whereby the side channel is directed into the corner of a chamber and the opening into the chamber is provided there. At least the side channel is in turn connected with the chamber film. The side channel and main channel can be formed e.g. with the aid of a film strip which is connected with a chamber film e.g. by welding.
Since the openings from the channel into the chambers are preferably situated in the chamber corners, the channel arrangement is located along the edge of the film bag, the main channel being disposed outside the longitudinally extending edge seam of the chambers when the channel arrangement is separated into a main channel and a side channel. This particularly ensures a uniform filling of the chambers even if a plurality of them are arranged in a row. Furthermore, it makes it possible to dispose a film bag on each side of the main channel, so that film bags with a plurality of chambers can be produced whereby the bags are simultaneously very flexible and can be well adapted in shape to the object to be packaged and protected.
Further embodiments of the invention can be found in the subclaims. The invention will be explained in more detail in embodiment examples with reference to the drawing, in which:
FIG. 1 shows a schematic top view of a film bag according to the invention having three chambers and a film strip stuck on the outside of the film bag for forming a channel;
FIG. 2 shows a section along II--II in FIG. 1;
FIG. 3 shows a

REFERENCES:
patent: 2595708 (1952-05-01), Salfisberg
patent: 3180558 (1965-04-01), Quaadgras et al.
patent: 3207420 (1965-09-01), Navorrete-Kindelan
patent: 3311287 (1967-03-01), Long et al.
patent: 3313472 (1967-04-01), Tjerneld et al.
patent: 4076872 (1978-02-01), Lewicki et al.
patent: 4550441 (1985-10-01), Keppel

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