EP0029142A1 - Nestable container folded up in one blank - Google Patents

Abstract

1. A stackable container (1) which has been erected from a blank and which has a quadrilateral container floor (2) which is surrounded on all sides by an upwardly conically opening container wall which, in its corner regions, has triangular fold portions (8-14) which extend from the corners (7) of the container floor (2) and which, partly over themselves and partly over quadrilateral wall regions (3, 4, 5, 6) disposed therebetween, form transitional portions between these wall regions which are folded so as to comprise three layers of material, characterized in that seven fold portions (8-14) are provided in each corner region, adjacent fold margins (17, 21 ; 20, 24 ; 23, 27) being contiguous, and in that the container (1) has a capacity of at least 56 litres.

Description

The invention relates to a stackable container unfolded from a blank with a container base, which is surrounded on all sides by an upwardly conically opening container wall, and with triangular folding parts with four common tips arranged at the corners of the container base, which are located in the connection point between the container base and two wall panels .find and the folded over to three layers of material form the transition between wall fields.

Containers of this type usually have three triangular folding parts on each corner. With the help of three such folding parts, however, apparently no great stability can be achieved. In any case, the previously known containers of this type generally have a folded edge or a similar edge reinforcement. For example, in the description of a previously known container (DE-OS 18 10 600, US-PS 35 36 248) the possibility of getting by without such a folding edge is mentioned; shown and explained in detail, however, only the embodiment with such a folded edge. Of course, the construction and the manufacture of the container is made complicated by this folded edge. This previously known container is also small in size (you should be able to eat directly from it); it is apparently not constructed so that its dimensions can exceed a certain small size.

The object of the invention is to provide a container of the type mentioned, which has a simple structure and which, even with larger dimensions, has sufficient stability for the storage of liquids and other flowable and pourable substances.

The solution according to the invention is that seven folding parts are provided at each tip, folding edges located on the same side of the same folding part touching after folding.

An essential merit of the invention is that it was recognized that the stability of the container can be increased to a decisive extent by seven folding parts. As with the previously known container, there are also only three layers of material one above the other at the corners. Nevertheless, the stability is much greater, which is primarily due to the larger number of fold edges. This greater corner stability is of course extremely important for filled containers. Due to the fold edges and the material edges placed three times one above the other, the pressure exerted on the corner by the filled containers stacked on top is distributed to the adjacent side surfaces, insofar as it is not absorbed by the corner areas themselves. It has also been shown that the flexibility of the corner area has increased due to the larger number of folds. Of course, the corner area must be stable; however, it should also have a certain amount of compliance so that it does not give a small impact is damaged immediately. This flexibility is caused by the fact that the folds open a little at this point with the appropriate application of force.

The edges of the folded parts are folded towards one another at two points on the inside and at one point on the outside. The folded edges of areas that are folded towards one another come into contact. It is therefore very difficult for material to penetrate behind the fold at this point, or not at all. This prevents the fold from being softened or damaged in any way. It has been shown that the container according to the invention can have quite large dimensions, even if it is made of paper or cardboard. Since paper or cardboard is approved as a container material for the storage of many chemicals for which plastic or metal are not permitted, the invention creates a simple container, if it preferably consists of paper or cardboard, which is also suitable for storing aggressive chemicals . Nevertheless, the container is very stable and reliable, which of course also has to be for the storage of such chemicals. In this case, the container still 'the Vort- _- in part, that the folding can be performed in a relatively simple manner along straight lines, so that the unfolding of the container can be carried out by machine.

Although the container is preferably made of paper or cardboard, it can of course also be made of other materials, e.g. Plastic or metal can be made.

If the container is made of cardboard, the stability can be increased very advantageously if multilayer cardboard is used for the production. The container could indeed be unfolded after the glue of the multilayer cardboard has hardened. However, if it is unfolded before the glue of the multilayer cardboard has hardened, no additional gluing is necessary to keep the fold stable even after removing the folding pressure or the folding tools. It has proven to be particularly advantageous to produce the container from five-layer cardboard. A particularly inexpensive material is Scandinavian kraft liner or sodium paper. The material thickness for these materials should be around 300 g / sqm and 0.5 mm per layer in order to obtain a container that is particularly suitable for the desired purpose. The layers can be glued with polyvinyl alcohol glue, dispersion or hot melt adhesive; these materials have proven to be particularly suitable. Of course, other glues are also possible.

The advantages of the container according to the invention can be fully exploited if the capacity is at least 56 liters. A capacity of 56 liters on the one hand takes full advantage of the container of the invention and on the other hand is compatible with the standards for packaging. The container can also be used very cheaply for larger capacities, which of course does not mean that it is not possible to manufacture the container for smaller capacities.

In order to further increase the stability of the container and to protect the upper edge, the container can be provided with a flanged metal band, the material thickness of which is preferably approximately 0.8 mm. This metal band naturally also prevents the fold from opening again.

• den Vorsprung jedoch, wenn der Behälter mit einem Deckel versehen ist, eine Auflage für den Deckel gebildet werden, das dann vor Verschiebung gesichert auf dem Behälter festgehalten wird. Dabei kann zwischen Deckel und Vorsprung der Sicke noch eine Dichtung vorgesehen sein.

The container can be provided below the edge with an inwardly projecting bead parallel to the edge. This measure also further increases stability. At the same time:

• the projection, however, if the container is provided with a lid, a support for the lid is formed, which is then secured against displacement on the container. A seal can be provided between the cover and the projection of the bead.

If the lid is fastened with a clamping ring, the contents can be locked against theft. In addition, the possibility is created that the container can be sealed by the customs authorities.

In the case of lids, the primary consideration is flat lids made of wood, chipboard, metal, plastic, paper or similar materials. However, the lid can also be a further, somewhat smaller container, which then fits into the larger container at the upper edge and rests on the projection of the bead. It goes without saying that the capacity of the container significantly enlarged.

The container according to the invention has proven to be very stable. If it is made from five-layer Scandinavian kraftliner with the above-mentioned material thicknesses, it can bear three times its own weight and the filling.

• Fig. 1 . in perspektivischer Ansicht eine erfindungsgemäße Ausführungsform des Behälters;
• Fig. 2 eine Draufsicht auf den Karton, aus dem der Behälter hergestellt wird, mit eingezeichneten Faltungslinien;
• Fig. 3 einen Querschnitt entlang der Ebene III von Fig. 1; und
• Fig. 4 einen Querschnitt entlang der Ebene IV von Fig. 1.

The invention is described below, for example, using advantageous embodiments with reference to the drawings. Show it:

• Fig. 1. in perspective view an embodiment of the container according to the invention;
• Figure 2 is a plan view of the carton from which the container is made, with fold lines drawn in;
• FIG. 3 shows a cross section along the plane III of FIG. 1; and
• 4 shows a cross section along plane IV of FIG. 1.

The container 1 has a container base 2 and four wall panels 3-6. Folded parts 8-14 extend from the corners 7 of the container base 2 and have the shape of pointed triangles and widen upwards towards the edge.

The folding parts 8-14 are shown in Fig. 2, the one Material cut with the fold lines shows. The fold lines are shown with solid lines, while the lines on which the fold lines come to lie after folding are dashed. In the unfolded state, the wall panel 3 is folded around the fold line 15 by not quite 90 ° out of the plane of the drawing towards the viewer around the fold line 15. The same applies to the wall panels 4, 5 and 6. The folding parts 8-14 are folded as follows.

The folding part 8 is folded around the folding line 17 so that its folding edge 18 comes to lie behind the line 16. Subsequently, the folding part 9 is folded forward again around the folding edge 18, so that its line 19 comes to lie under the folding edge 17. Then the folding part 10 is folded forward around the folding edge 20 until its edge 21 comes to lie on the line 19 of the folding part 9. Now the folding part 11 is folded around the edge 21 in the other direction, so that its line 22 comes to lie over the folding line 20. Then the folding part 12 is folded backwards around the folding edge 23, so that its folding line 24 also lies behind the line 22 of the folding part 11, specifically directly next to the folding edge 20. Then the folding part 13 is again forward around the edge 24 folded so that its line 25 lies behind the fold line 23. Now the folding part 14 is folded forward about the folding line 26 so that its edge 27 comes to lie on the line 25. Then the wall element 6 is folded around the line 27 so that the line 28 comes to lie over the fold line 26.

The result of the folding is drawn again in section in FIG. 3. There is a four-layer material shown. As already mentioned, a five-layer material has proven to be particularly advantageous; however, a larger or smaller number of layers can also be used. In the area of the folding, three layers of the multilayer material lie one above the other. As shown at 29, 30 and 31, after folding, folding edges located on the same side of the same folding part abut each other. This prevents the stored material from penetrating into the folds.

. In Fig. 4-it is shown that a metal strip 32 is fastened to the upper edge of the container and is bent in a U-shape around the container edge. At 33, a bead is pressed into the metal band and the container wall, which runs parallel to the edge and runs around the entire edge. This bead creates a support surface for a cover 34, which is also provided on its edge with a seal 35 which is glued to cover 34 at 36. Around the entire edge of the container is still a clamping ring 37 which engages in the bead and engages over the lid, so that the lid is held securely. This type of closure can prevent the content from leaking and being stolen. This type of closure can also be sealed for customs or other purposes.

Claims (17)

1. From a blank unfolded stackable container (1) with a container base (2), which is surrounded on all sides by an upwardly conically opening container wall, and with triangular folding parts (8-14) with four at the corners of the container base (2) arranged common tips (7), which are located in the connection point between the container bottom (2) and two wall panels (3, 4, 5, 6) and which, folded into three layers of material, form the transition between wall panels, characterized in that at each tip (7 ) seven folding parts (8-14) are provided, folding edges (17, 21; 20, 24; 23, 27) on the same side of the same folding part (9; 11; 13) touching after folding. 2. Container according to claim 1, characterized in that it is made of cardboard. 3. Container according to claim 1 or 2, characterized in that it is made of multi-layer cardboard. 4. Container according to claim 3, characterized in that it is unfolded before the glue of the multilayer cardboard has hardened. 5. Container according to one of claims 1-4, characterized in that it is made of five-layer cardboard. 6. Container according to one of claims 1-5, characterized in that it is made of Scandinavian kraft liner or soda paper. 7. A container according to claim 6, characterized in that the material thickness per layer is approximately 300 g / sqm and 0.5 mm. 8. Container according to one of claims 3-7, characterized in that the layers are glued with polyvinyl alcohol glue, dispersion or hot melt adhesive. 9. Container according to one of claims 1-8, characterized in that it has a capacity of at least 56 liters. 10. Container according to one of claims 1-9, characterized in that the upper edge is provided with a flanged metal band (32). 11. A container according to claim 10, characterized in that the material thickness of the metal strip (32) is approximately 0.8 mm. 12. Container according to claim 10 or 11, characterized in that it is provided below the edge with a parallel to the edge, inwardly projecting bead (33). 13. Container according to one of claims 1-12, characterized in that it is provided with a lid (34). 14. A container according to claim 12 or 13, characterized in that the lid (34) rests on the projection of the bead (33). 15. A container according to claim 14, characterized in that a seal (35) is provided between the lid (34) and the projection of the bead (33). 16. Container according to one of claims 13-15, characterized in that the lid (34) is fastened with a clamping ring (37). 17. A container according to any one of claims 14-16. characterized in that the lid (34) is a further, somewhat smaller container.

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