CZ214294A3 - Wrapping forming a bag, particularly for bulk material - Google Patents

Abstract

A sheet including at least one pleated region (13) with end-fastened folds (3). The sheet is folded in half in a direction perpendicular to that of the folds (3) and at least one of its ends (15) is sealed by fastening together the edges to give a receptacle suitable for loose goods. The receptacle may then be extended out to provide a fully or partially sealed package.

Description

Technical field _ _

The invention relates to a packaging made of a folded film which allows packaging, in particular, but not exclusively, of bulk goods such as chips.

BACKGROUND OF THE INVENTION

FR-A-2595666 discloses a convex body with an auxiliary folded thin film, the folds of which are joined at their ends. FR-A-2628719 claims several variants of joining said pleats. FR-A-2676037 discloses a package made of paper, one portion of which is folded and extensible, and the other non-folded portion of which is formed from the same film or another film attached to the end of said folded portion. This cover is designed for packing convex objects with relatively strong shape. None of these packages, on the other hand, allows the packaging of a set of objects that are inconsistent because they are not rigid in shape because the package cannot be spread around these objects. French Patent Application No. 91-11965 proposes to solve this problem by attaching a cardboard box to a folded paper sheet that is extensible. The goods are placed in a cardboard box, then the paper sheet is stretched, the cardboard box being used as a convex-shaped pedestal. This solution, which makes it possible to obtain a relatively aesthetic package, is expensive because it uses cardboard. In addition, it has the disadvantage of connecting a rigid sheet, which has a complex shape, to a pleated flexible sheet, thereby causing the risk of tearing the joint of the two types of material during handling.

It is an object of the present invention to provide a packaging, in particular a bulk goods packaging, which is formed only of thin films.

BRIEF DESCRIPTION OF THE DRAWINGS.

The attached drawings show exemplary embodiments of a package according to the invention.

Figure 1 shows an unstretched package according to the present invention.

Giant. 2 shows an unstretched package according to the present invention which is provided with an organ-shaped folded bottom.

Figure 3 shows the expanded package of Figure 1.

Giant. 4 shows the package of FIG. 2, expanded to an arrangement where the shape of the pleats allows the container to be formed.

Fig. 5 shows a variant of a package according to the invention which comprises a non-folded part which is closed at its end.

Figure 6 shows the expanded package shown in Figure 5.

Fig. 7 is a variation of the package shown in Fig. 5 wherein its non-folded portion is connected at one end at its end and on its other side is connected to the folded portion to form a bag.

Giant. 8 shows a variant of the package of FIG. 5, the folded portion of which is replaced by another folded portion, the folds of which are blocked so that they cannot be stretched.

Giant. 9 shows the package of FIG. 8, which is closed by stretching its folded portion.

Fig. 10 shows a variant of the package of Fig. 8, the folds of which are not blocked and can thus be stretched before closing the package by expanding the folded portion.

FIG represents packaging shown in FIG .10 at full stretching. Fig.12 show e packaging 6 of it rollover and opening. Fig.13 show e packaging according to the invention with indented

edges.

Figure 14 shows a film whose edge comprises a flange formed prior to the film being folded.

Fig. 15 shows a folded film showing the fold connection areas.

16 shows a bag according to the invention, the folds of which have been expanded to expand the opening.

Fig. 17 shows a bag according to the invention comprising a sandwich.

Fig. 18 shows a bag comprising the sandwich of Fig. 17 closed by a flap.

Figure 19 shows the bag of Figure 17 whose folds have been expanded to expand its opening.

Fig. 20 shows a cross-section of the pleated area of Fig. 15 at a point below the skirt.

DETAILED DESCRIPTION OF THE INVENTION.

In a first embodiment of the invention, the folded wrapper is made of a thin film according to one of the patents FR-A-2595666 and FR-A-2676037, the pleats have a substantially planar and rectangular shape, the wrapping being folded in such a way that the fold formed 1 or the folds 2 (FIG. 2) are perpendicular to the folds 2 (FIG. 1) and thus form the envelope. The side edges 4 and 2 are joined together by means of a thin film bonding means to form a bag. It is also possible to form the bottom of the bag (FIG. 2) by suitably stacking the organ 6 in such a way that more space is created at the bottom of the bag. This bag (Fig. 1 or Fig. 2) can be advantageously used in fast food stores as a substitute for traditional French fries. The bag is made, for example, of a complex sheet of paper and polyethylene in a thin layer, whereby the folds 2 at their ends 7 and the side edges 4 and 2 are joined by welding. The described pouch may be filled with chips similar to a cardboard cone. Like the cone, this bag serves as a metering device for the amount of chips supplied. When using the bag, the workers' hands are protected by several layers of paper resulting from the initial folding forming the folds 2 · Folding may be designed to be formed by selecting the ratio between the length of the short side of the fold and the length of the larger side as described in the patents cited above. at least three layers of foil. At this ratio greater than 2, the area comprising three layers of paper alternates with areas having only one layer, while at this ratio less than 2 there are at least three layers of paper. After the bag has been filled with a plurality of chips, it is possible to open the base 2 by pulling on the corners 5 and thereby spread the folds formed. The volume of the bag thus increases (FIG. 3) and the chips then fall into the cavity protecting them against cooling. the original opening 10, which serves as ventilation and which tends to close partially like the lips, is retained. The enlarged bag thus formed can be set up and held in a stable position, which is both a function of the height 29 of the bag and a degree of extension thereof as a function of the shape of the folds (FIGS. 3 and 4). It is possible to achieve an effect which makes it possible to limit the losses of the chips in the event of the overturning of the expanded bag, this being achieved, for example, at a large fold ratio, e.g. The shape of the expanded bag / fig. 3 / reminds of a part of a circular ring consisting of two concentric circular 'arcs bounded by radii formed by the welds of the lateral edges 4 and 5, which form an angle with each other

11. Less than 180 °. When the bag is inverted, the chips are preferably directed towards the opening, especially if the angle is small. When the aspect ratio of the pleats is small, for example about 1.5 (Fig. 4) and the ratio of width 30 and height 29 varies, for example, within the same range, the angle 11 between the radii formed by the side welds 4 and 5 is greater than 180 °. The bag formed has a type of corner in which, after the bag has been inverted, the chips may become trapped so that they cannot fall through the opening 10, which is then located above the goods. At the same time, none of this prevents the consumer from inserting his fingers through the opening in the expanded bag (Figs. 3 and 4), pulling out the chips and then consuming them. The bag with the organ-shaped bottom (FIG. 2) and FIG. 4 (i) and the bag with the bottom without these organs (FIG. 1 and FIG. 3) are identical. The previously described effects, as well as the effects described below, apply equally to both types of these day 1 and 2 sachets and therefore only one of the two cases will be described subsequently.

Another possibility of creating a container for goods is to start from a folded package of the type described in patent application FR-A-26767037, in which the folded portion 13 is set up by a non-folded portion 14 which makes it possible to wrap for example a sandwich and made of semi-rigid crepe folded in half. This wrapper is stacked with the possibility of forming an organ as was possible with the previous wrapper, with only the end 15 of the unfolded portion 14 being joined. The goods are placed in the non-folded portion 14 so as to optimally fill it to form a coherent whole, which can then be closed (Fig. 6) by stretching the folded portion 13. The same result can be achieved by using the non-folded portion 14 with a width 16 equal to or different from the width 17 of the folded portion, the non-folded portion 14 being attached to and connected to the folded portion 13 as known from patent application FR-A-2676037. The assembly composed as above and the end 15 of the unfolded portion 14 are then joined together. One of the advantages of this type of packaging is that the unfolded portion 14 can be lifted as a cover and thus exposes the bulk goods contained in the expanded portion 13, which has the shape of a cup / FIG. 12 /. In one variation of the embodiment just described, the unfolded film 18 (FIG. 7) is joined at both ends to form a bag that can be overlapped by stretching the folded portion

21. A further improvement of the described embodiment of the invention consists in replacing the unfolded portion 14 or 18 with the folded portion 22 (FIG. 8), the folds of which are joined at their ends and either have the same pitch as the folds of the folded portion 23 or different pitch. The folds 24 thus formed can serve as thermal insulation in the unstretched state. If necessary, these folds can be joined together, for example along one or more lines 25 perpendicular to the direction of the folds 24, so as to prevent them from being stretched and the wrapper was as described above (FIG. 5 and FIG. 7). 8 and FIG. 9). It is also possible to block the folds 26 (Fig. 10) and allow them to be expanded only in such a way as to form a receptacle 27 which, after being filled with the goods and expanded, can be covered by stretching the folded portion 28 so that mailbox closes. As already mentioned, the described embodiments of the invention also relate to a package comprising an organ-shaped bottom 6. (FIG. 2). With respect to the folded portion 13 (FIG. 5), as well as the non-folded portion 14, the accompanying drawings are given by way of example only and the actual solution is not limited thereto. Similarly, the non-folded portions may be replaced by a folded portion 22 (FIG. 8) with locked folds or non-locked folds 26 (FIG. 10) in all of the embodiments described.

To better open the previously described folded package, it is sufficient to offset the edges 31 and 32 / fig. 13 / hole. The bag wall 33 corresponding to the longer edge 32 then serves as a guide for separating the wall 31 and thereby opening the bag. Under these conditions, when the folds 34 are joined by a flange 35, e.g. located on a sheet of paper covered with polyethylene on the face, and where the offset 36 between the two edges 31 and 32 is preferably selected greater than the height 37 of the flange 35, forming the distal rear side, when forming the weld 14, the side edges 4 and 5 of the bag come into contact with the polyethylene covered wall 33 and therefore can be joined to another surface 33. The offset 36 between the two edges 31 and 32 can be intentionally increased so that of two walls 41 / FIG. 17 / may form a flap that allows the bag to be sealed in a manner similar to the envelope (Fig. 18). It has been noted that in the bag thus formed, it is apparent from the presence of folds that at least one portion 42 (FIG. 20) of the bag surface comprises at least three layers of paper 43, 44, 45 and provides more effective insulation against heat loss in such areas.

If the ability to stretch the folds of the bag (Fig. 16) is desired so that it can be opened widely without the risk of tearing the folded film, the initial break coming from the edge of the film is sufficient before folding (Fig. 15) of the film 47 / fig. 14 / form a rim 46. This rim 46, which may be attached by any known means, depending on the material used, prevents the rim 48 from being loaded by direct tensile forces. The folds 49 are fastened together (FIG. 15) preferably only on one side of the film in such a way that, for example, the sheets 44 and 45 (FIG. 20) are held together by welding the outer coating when added, for example by adhesive bonding or coating; directly onto the surface of the film, while the sheets 43 and 44 do not hold together. For example, when polyethylene-coated paper is used, the skirt 46 (Figure 14) is made by placing the plastics material inside the fold and the skirt 46 is welded in place 50. Specifically, the skirt 46 is, for example, 5-10 mm wide for wrappers used to contain about 150 g 15, and the folds are joined in the region 51 adjacent to the skirt 46 by direct heating of the paper in such a way that the walls 52 and 53 (Fig. 20) of the polyethylene-coated sheets 44 and 45 are in contact with each other. are welded together. In the folded area 54 / FIG. 15), corresponding to the skirt 46, which has only paper walls, there are no folded connections of the pleats, and this region 54 is not stressed in any way when the pleats 34 are stretched in a direction 55 perpendicular to the pleats 34. 51 the interconnection of the pleats is a polyethylene coating common to both the walls 52 and 53 (Fig. 20), under the effect of a tension that is perpendicular to the pleats

34. separated from one of the walls. This tear is facilitated by the fact that in the folding technique used, the weld causes peeling and not shear. For certain applications, the folds 34 (FIG. 15) can be joined in the same manner as described in other regions of the bag, and in particular near the bottom 56 (FIG. 16). If desired, the bag opening 57 may be expanded to have the shape of the basket without expanding its bottom, or vice versa, only the bottom 56 may be expanded in such a way that the opening is reclosed to best maintain the temperature of the bag contents.

This type of bag can be used very well (fig 17) for storing sandwiches of various shapes. The closure of the bag (FIG. 18) may be accomplished by means of a flap 41 which is formed by the long side of the bag and secured, for example, by a sticker 58 or other means available on the market. In order to consume the sandwich 59 (FIG. 17) contained in this bag, it is sufficient to detach the edges of the bag, enlarge their size and slide out a portion of the sandwich 59 without having to remove it from the packaging. This bag is particularly suitable for long sandwiches

Claims (7)

Patent Claims' 1. A container forming a bag, in particular for bulk goods, made of a folded thin film stacked perpendicular to one another. direction (folds) 3 so as to form two walls ⁵ joined together by at least one of their edges (4 and 5) and an organ-shaped bottom (8), leaving an opening whose edges are offset from each other, characterized in that the unsymmetrical folds (3) joined at their ends include, in the vicinity of the flange (35, 46) formed prior to the stacking and use of the glue strip, an additional temporary connection of the walls (52 and 53) of all folds facing each other on the same side foil so that the parts / 44 and 45/44/44 / folds, allowing said pleats to be extensible by the tension exerted perpendicularly at the corners (9) of the bag, which will move the pleat portions (44 and 45) and allow the packaging volume to increase . Packaging according to claim 1, characterized in that it comprises a non-folded portion (14) located directly in the direction of the folding direction, whose width (16) is equal to or different from the width (17) of the folded portion (13), possibly formed of the same the film as a folded or attached portion closed at its ends (15), which serves as a container for bulk goods, while the folded portion (13) can be stretched to close the container. 3. Packaging according to claim 2, characterized in that the non-folded portion is closed at its end first, / 19 /, and also in ^department / 20 / from the folded portion / 21 /, thereby forming a bag which can be closed by pulling the folded portion /13/. Packaging according to claims 2 and 3, characterized in that the unfolded part (14) is replaced by folds (22) joined at their ends which also allow attachment along one or more lines (25) to prevent them from being stretched and to form Thus, the thermal insulation is overlapped by several layers of foil. Packaging according to claim 4, characterized in that some of the folds (26) are joined only at their ends so that they can be stretched before the container as a whole is gradually closed by expanding the other folded part (28). Packaging according to claim 1, characterized in that the offset (36) of the edges (31 and 32) is greater than the height (37) of the rim (35) so that the edge (31) can be connected to the inner wall (33) of the bag. Packaging according to claim 1, characterized in that the same method of temporarily connecting the pleats is used in other regions of the bag and in particular near the bottom (56).