WO1998026989A1

WO1998026989A1 - Method for producing collapsible cardboard boxes and base material and intermediate products for this

Info

Publication number: WO1998026989A1
Application number: PCT/EP1997/007027
Authority: WO
Inventors: & Lemke Fülltechnik Gmbh & Co. Kg Leifeld; Jürgen DAMMIT
Original assignee: Leifeld & Lemke Fuelltechnik G
Priority date: 1996-12-14
Filing date: 1997-12-15
Publication date: 1998-06-25

Abstract

The invention relates to a method for the production of a multi-layer foldable base material for constructing collapsible cardboard boxes, which is improved in view of the economic production parameters such as consumption of material, waste of material, energy consumption and need for particular machine elements, as well as the ecological justifiability, such as low material quantities, optimization as regards stiffness, transportability and the like. A method is proposed for the production of multi-layer, foldable base material for constructing collapsible boxes with a side wall area, a top and a bottom sealing area, in particular for free-flowing media, whereby at least one reinforcing intermediate layer is built in between at least one flexible outer and/or inner layer respectively, in such a way that substantially rectangular sections can be formed, one edge length of which corresponds to the perimeter of the to-be-constructed collapsible cardboard box in the side wall area plus an increase for the formation of a strip-like edge, and the other edge length of which corresponds to the height of the side wall area of the collapsible cardboard box that is to be constructed plus the lengths for the formation of the top and/or bottom sealing areas, and that the at least one reinforcing intermediate layer covers the area of the base material that corresponds to the side wall area of the collapsible cardboard box that is to be constructed, while outside the side wall area all folding edges are formed only by flexible materials without a reinforcing intermediate layer material.

Description

Process for the production of folding boxes as well as base material and

Intermediates for this

The present invention relates to a method for producing multilayer foldable base material for forming folding boxes with a side wall area, an upper and a lower closing area, in particular for flowable media, intermediate products formed therefrom and folding boxes.

Different packaging is known in the packaging industry for use with flowable consumer goods. A distinction is made between disposable and reusable packaging, although the reusable glass containers are sometimes used as disposable items for economic reasons. The selection of the respective packaging takes into account ecological and economical parameters.

The advantage of disposable packaging is that it can usually be produced more cheaply, since it is only required once, but this has the disadvantage of having to be disposed of. From an economic point of view, one-way packaging should be inexpensively producible with as little material and as little energy and machine expenditure as possible, from an ecological point of view, the one-way packaging should also have only little material to be disposed of, which should be as biologically compatible as possible, and from a market point of view, the one-way packaging must fulfill the purpose to make the filled flowable medium safely transportable, storable and accessible.

Among the disposable packaging, folding boxes in particular have recently proven to be preferred. Folding boxes of this type are usually designed as so-called gable packs, ie they have side walls, an essentially flat bottom and a gable-shaped upper closure. This upper closure can be closed cut open, kink and tear or open similar measures so that the flowable medium stored in the container can be poured out.

Such gable packs are usually made of cardboard or cardboard, which is coated depending on the medium filled. Coatings can be made, for example, by using plastics, polyethylene, by aluminum, also in the form of foil and the like.

The entire packaging must consist of cardboard and coating material of high quality, so that the material costs are considerable. If the cardboard is too thin, the packaging tends to bulge, which has a negative effect on stacking, transport and handling. However, if the cardboard is sufficiently stiff, the packaging itself is comparatively heavy and material-intensive, so that, in addition to the production costs, the transport and disposal costs also increase. In addition, special machines and high energy expenditure are required to process such massive cardboard materials into packaging, that is to say to print, punch and fold them. In order to create tightness when using a stiff material, very stable weld seams usually have to be carried out, since the material tends to spring back despite intensely pre-grooved fold lines.

A solution to the problem described can be found in EP 0 108 537, which discloses packaging which is also suitable for liquids and comprises at least one layer made of a rigid material and a layer made of thin material provided on at least one side of the rigid material. The rigid material forms a central base element with end flaps at opposite ends and side elements formed with gussets. The six side walls of a pack are formed from this rigid material. Some areas are stiffened several times. In the worst case, there may be up to six layers of overlap in the closure areas. No information is given on the economic viability or improvement of the ecological properties. The amount of material is neither reduced, nor is the folding process simplified. Rather, due to the complicated design of the cut, a considerable waste in material production and cut production can be expected. For the economical application of such gable packaging during production and filling, there is a need to form an intermediate product after the production of a suitable material web and before filling, which is optimally prepared but easy to transport and use.

On the basis of this prior art, the present invention is based on the task of specifying a method for producing folding boxes which, taking into account the economic production parameters such as material requirements, material waste, energy requirements and the need for special machine elements, and the ecological justification such as small quantities of material, optimization with regard to Stiffness, portability and the like is improved.

Another object of the invention is to provide a method for producing an intermediate product from a multilayer, foldable base material for forming folding boxes, which can be carried out in an economical manner and to optimize a simple and economical conversion from the web material to the finished packaging.

Finally, it is the intention of the invention to provide a method for producing a multilayer foldable base material for the formation of folding boxes, which, taking into account the economic production parameters such as material requirements, material waste, energy requirements and requirements for special machine elements, as well as the ecological justification such as small quantities of material, optimization with regard to rigidity, Transportability and the like is improved.

For the technical solution to this problem, the invention proposes that at least one stiffening intermediate layer be inserted between at least one flexible outer or inner layer in such a way that essentially rectangular blanks can be formed, one edge length of which corresponds to the circumference of the folding box to be formed Sidewall area plus a supplement to form a strip-like edge corresponds and the other edge length corresponds to the height of the sidewall area of the folding box to be formed plus the length of the formation of the upper and lower closure areas, and that the at least one stiffening intermediate layer covers the area of the base material corresponding to the side wall area of the folding box to be formed, while outside the side wall area all folded edges are formed free of stiffening intermediate layer material only by flexible material.

Advantageously, the invention further proposes that after folding the side wall region, the strip-like edge is closed as an intermediate product to form a material hose, and that the lower and upper closure regions are closed.

The solution according to the invention also provides a simple method for forming an intermediate product and provides a completely novel intermediate product which, after the production of a suitable base material, which is usually in web form, after production of blanks, reaches a production status which allows the material to be transported easily but the subsequent application is considerably simplified. This is brought about by an intermediate product in the form of a material hose according to the invention.

A number of advantages are made possible by the configuration according to the invention. Starting from the simplest case of an outer layer, an inner layer and a stiffening intermediate layer, both the outer layer and the inner layer are used without further waste so that essentially rectangular blanks can be formed. A stiffening intermediate layer is introduced between the two layers and, as far as the side wall area of the folding box to be formed is concerned, also has a simple rectangular cut. However, this rectangular cut of the intermediate layer is smaller than the rectangular cut of the outer or inner layer. The edge length in the circumferential direction of the side wall region of the folding box to be formed is such that the outer or inner layer has a longer edge than the intermediate layer. An edge thus remains, which forms a strip in the folding box to be formed. Its function will be described later. In the other direction too, the edge length of the intermediate layer is considerably shorter than that of the outer or inner layer, so that the closure regions are not filled with the rectangular intermediate layer region which forms the side wall area. According to an advantageous proposal of the invention, triangles can be arranged in the closure areas for stiffening or infill, but it is essential that all folded edges remain free of stiffening intermediate layer material and are formed only by flexible material. On the one hand, the construction according to the invention makes it possible to use almost any, ie also recycled, material as a stiffening intermediate layer. In addition, there is practically no waste. The outer layer and inner layer can be adapted to the area of application, the filling medium and the like. The choice of stiffening material is of secondary importance as long as the mechanical properties are achieved. Finally, the folding edges in the closure area, which are kept free of intermediate material, enable simple further processing of the base material. No high folding forces need to be applied. This also reduces the mechanical work involved in further processing. In the simplest form, only the

Side wall areas of the packaging stiffened. The upper and lower closure area, i.e. the packaging base and packaging gable, consist exclusively of thin, flexible material. Folding is therefore considerably simplified. This also applies to gluing or welding the layers. Only as much material is used as is absolutely necessary.

According to an advantageous proposal of the invention, the edge length of the outer or inner layer compared to the intermediate layer is such that an edge region of the outer or inner layer remains on both corresponding edges of the intermediate layer. After folding a package, these two edge regions made of flexible material can thus be welded or glued to one another, that is to say they can be connected homogeneously. The edge regions can also be milled or folded over or sealed with a strip of polyethylene and the like. This ensures simple, liquid-tight sealing of the packaging, and also precludes the stiffening material from coming into contact with the liquid. The resulting connecting strip can be folded over and attached to the outside of the packaging on one of the side surfaces, whereby only flexible material is also attached to flexible material. Hereby Particularly simple manufacture of a material hose as an intermediate product is guaranteed.

According to an advantageous proposal of the invention, the substantially rectangular intermediate layer is provided with fold lines for the formation of the side wall. One fold line should be formed less than side walls. Since the packaging can have a cuboid, but also a polygonal cross-section, that is to say triangular, octagonal and the like, the corresponding design options result from the fold line arrangement.

It is particularly advantageous with the invention that the fold lines in the intermediate layer material, which are essentially parallel to one another for the side wall formation, all run parallel in the feed direction of the intermediate layer material to the material webs of the outer and inner layers. This particular configuration according to the invention simplifies the further processing of the base material, since no forces have to be applied transversely to the conveying direction, which could interrupt the conveying flow.

In a particularly advantageous manner, the fold lines are formed only shortly before the interlayer material is introduced between the outer and inner layers.

The closure areas, which are free of interlayer material per se, can be covered, for example, with triangular interlayer material surfaces outside the fold lines. The intermediate layer materials as well as the outer or inner layer materials can preferably be fed to a press roll system in the form of a web, for example drawn off from rolls. Likewise, the intermediate layer materials as well as the outer or inner layer materials can be supplied as a blank, for example from a stack. A material web forming an outer layer and a material web forming an inner layer are fed to a pair of press rolls, essentially overlapping one another. Before being fed, the material webs can be coated with an adhesive material for the purpose of gluing them together. Before entering the roller slot, the interlayer material, which is also web-shaped from a roll peeled off, provided with folding lines and cut to length, passed between the outer and inner layers. The interlayer material can also be supplied as a blank. After exiting the pair of rollers, the material web of the base material is ready. It goes without saying that further intermediate layers, flexible or rigid, can be added accordingly. Outer and inner layers can also be constructed in a sandwich-like manner and connected to one another in the manner described above.

In the embodiment described, according to which the fold lines of the intermediate layer material run parallel to the feed direction, the width of the material webs forming the outer or inner layers is the width which corresponds to the side wall circumference plus the connecting edge. The required length, ie. H. Sidewall height plus the locking areas generated.

According to a proposal of the invention, the material forming the outer and inner layers is completely or partially bonded to one another in all areas in which the two layers touch each other. The two layers preferably consist of a kraft paper and the surfaces forming the inside and outside of the packaging are coated. Here, for example, a moisture protection coating is recommended. The kraft paper is preferably a bleached, tear-resistant, machine-smooth material without a line with a basis weight of 50 to 80 g / m ^, depending on the planned packaging size. On the inside, the inner layer can be provided with a light blocking film, preferably an aluminum film with a moisture protection coating. The moisture protection coating can preferably be a polyethylene coating with 25 to 30 g / m 2 basis weight. A corresponding moisture protection coating can be applied to the outside, but 1 2 to 1 5 g / m 2 are sufficient. Likewise, the outer and inner layer material can be made of plastic or a plastic-metal connection.

The intermediate layer is preferably made of gray cardboard, in particular with a weight per unit area of 250 g / m ² or more, depending on the pack size and the stiffness requirement. At least one of the outer and inner layers is glued to the intermediate layer material. The bonds can be carried out selectively and can be detached using an appropriate pressure sensitive adhesive. It is entirely sufficient if the intermediate layer material can be arranged in a stationary manner on one of the webs during the production process. Depending on the application, it can be determined whether there is still a bond. It is also possible to form pockets between the eye layers, in which stiffening material is enclosed.

If very thin material is used for the outer or inner layer or if the side edges of the packaging to be created are endangered by external influences or generally to protect the side edges against unintentional tearing, it can be provided according to the invention that the intermediate layer with a narrow area together with the outside - and inner layer is folded over. The intermediate layer in one edge region is thus dimensioned from one side edge to the other without an edge region consisting only of flexible material remaining. Nevertheless, a single-sided or double-sided edge is provided for gluing. After folding over the side edge area to form a stabilized side edge, care must be taken that the inner and / or outer layer material covers the intermediate layer material in such a way that it is neither visible nor vulnerable to external influences. The material that is protected from sight and influence is only used for edge reinforcement.

The invention provides a new method for producing folding boxes, an intermediate product and a base material for packaging, in particular folding boxes with a gable closure, which offers many advantages. In addition to reducing the amount of material, which is economical and promotes waste reduction, there are practically only rectangular material areas or, if triangular areas are introduced into the closure area, these can be traced back to rectangular basic cuts, so that practically in contrast to EP 0 described above 1 08 537 no waste is expected. The corresponding operations for creating blanks are also very simple. The production of the intermediate product is very simple and automatable. The intermediate product itself can then leave the material-producing plant and be transported to a filling station, where it can be filled simply by unfolding and then closing the bottom. Finally, the second closure can then be made so that the packaging is filled and ready.

The packaging made from the new base material is significantly improved since it can be opened easily because there are no large, continuous stiffening areas.

The manufacturing costs will be significantly reduced and the sealing properties will be improved.

Further advantages and features of the invention result from the following description with reference to the figures. Show:

Fig. 1 is a schematic sketchy representation of a

Manufacturing process;

2 shows a perspective view of an exemplary embodiment of a base material web;

FIG. 3 shows a sectional view along III-III according to FIG. 2;

4 shows a perspective illustration of an exemplary embodiment for packaging using the base material;

5 shows a schematic illustration of an exemplary embodiment for a blank;

6 shows a schematic, perspective view of a first method step for producing an intermediate product;

Fig. 7 is a schematic, perspective view of an intermediate and Fig. 8 is a side view of a folded intermediate product.

The material rolls 1, 2 and 3 are shown in FIG. 1. The material rolls 1 and 2 contain the outer layer material 4 or the inner layer material 5 and the material roll 3 contains the intermediate layer material 6. The intermediate layer material 6 can also be a blank.

The intermediate layers 7 are formed after the introduction of fold lines and cutting the blank from the material roll 3. The intermediate layers 7 are then guided over a belt 8 into the nip between the rollers 9 and 10.

The outer layer material 4 or the inner layer material 5 are guided over glue rollers 1 1, 1 2. These are shown schematically and symbolize a coating unit. In addition to glue, other coatings can also be applied at these points if necessary. Other web treatments can also be carried out, for example preheating by means of hot air, radiation or the like, cooling if necessary or structure-changing effects, radiation or the like if this is desired.

The finished base material 1 3 emerges from the pair of rollers 9, 10, which is also only shown symbolically, so that an entire pressing or joining station can also be formed here. This can be divided directly or in later work sequences along the cut edges 15, 16 according to FIG. 2 into cuts 14. Each of the blanks 14 has the intermediate layer 7 approximately in a central position, so that the side edges 17, 1 8 are also formed to form a liquid-tight side wall closure. In addition, the closure edges 19, 20 are formed, which are designed to form a floor or a gable closure. Since only flexible materials are arranged here, the packaging is easy to manufacture.

It goes without saying that after forming a blank and folding along the folded edges, the side edges 1 7, 1 8 overlap. These can be closed, bent and one of the outside Attach side panels. The material hose formed in this way can be fed, for example, as an intermediate product for further processing and filling.

FIG. 3 shows a sectional view along the section line III-III according to FIG. 2. Here it can be seen how the intermediate layers 7 are introduced between the outer layer material 4 and the inner layer material 5 in order to form a composite material.

The gable package 21 shown in FIG. 4 has the side wall region 22 and is provided with a cuboid cross section in the exemplary embodiment shown. The floor 23 and the gable 24 are closed. On the gable 24, the folding edges 25, which are introduced exclusively into the flexible material, are shown. The closure 26 then finally results on the upper edge.

5 shows an exemplary embodiment of a blank 31 which consists of an outer and an inner layer made of flexible material 32, between which a stiffening intermediate layer 33, for example cardboard, is inserted. There remain upper and lower free edges in which there is no interlayer material. In addition, left and right side edges 35 and 36 remain in the image plane. These are of particular importance for the formation of the intermediate product.

As shown in FIG. 6, the blank is folded such that a material tube 37 is formed in the intermediate layer material 33 using the fold lines 34, after which the two side edges 35, 36 are connected to one another. This connection is preferably carried out by gluing or welding, so that there is absolute moisture tightness. As a result, the elongated side edge marked 39 in FIG. 6 is formed, here from the intermediate layer material. The inner and outer layers are preferably welded or glued in the area of the side edges 35, 36 and then folded over with the extended side edge 39 of the intermediate layer 33 and can also be glued or welded on one side layer. The side edges are then, for example, in the direction of arrow 38 to the adjacent Sidewall created and attached there, which also happens by gluing, welding or the like. The result is the material hose shown in FIG. 7, which can be folded flat again, so that it takes on the shape shown in FIG. 8. This material hose can be stacked and transported and easily processed into packaging by machine.

Reference list

1 roll of material 31 cut

2 roll of material 32 flexible material

3 Roll of material 33 intermediate layer

4 outer layer material 34 fold lines

5 inner layer material 35 page margin

6 liner material 36 page margin

7 Intermediate layer 37 material hose

8 volume 38 arrow

9 roller 39 extended side edge

10 roller

1 1 glue roller

1 2 glue roller

1 3 base material

14 cutting

1 5 cutting edge

1 6 cutting edge

1 7 side edge

1 8 side edge

1 9 closing edge

20 closing edge

21 gable pack

22 side wall area

23 floor

24 gables

25 folding structures

26 closure

27 side wall part

28 side wall part

29 side wall part

30 side wall part

Claims

claims

1 . Process for the production of multilayer, foldable base material for the formation of folding boxes with a side wall region, an upper and a lower closure region, in particular for flowable media, wherein at least one stiffening intermediate layer is inserted between at least one flexible outer and inner layer in such a way that essentially rectangular blanks can be formed, one edge length of which corresponds to the circumference of the folding box to be formed in the side wall area plus an addition to form a strip-like edge and the other edge length of which corresponds to the height of the side wall area of the folding box to be formed plus the lengths to form the upper or lower closure areas, and that the at least one stiffening intermediate layer covers the area of the base material corresponding to the side wall area of the folding box to be formed, while outside the side wall area all folding edges are free of stiffening interlayer material can only be formed by flexible materials.

2. The method according to claim 1, characterized in that the strip-like edge is formed free of stiffening intermediate layer material on both sides of the side wall region.

3. The method according to any one of the preceding claims, characterized in that intermediate layer material is introduced in a rectangular blank.

4. The method according to any one of the preceding claims, characterized in that the intermediate layer material is provided with fold lines for the edges in the side wall region.

5. The method according to claim 4, characterized in that the intermediate layer material is fed between the outer or inner layers so that the fold lines run parallel to the feed direction.

6. The method according to any one of claims 4 or 5, characterized in that the fold lines are formed directly before inserting the intermediate layer material.

7. The method according to any one of the preceding claims, characterized in that at least one of the upper or lower closure regions is formed completely free of intermediate layer material.

8. The method according to any one of the preceding claims, characterized in that triangular inserts made of intermediate layer material are introduced into at least one of the closure areas.

9. The method according to any one of the preceding claims, characterized in that the intermediate layer material is fed in web form from a roll.

10. The method according to any one of the preceding claims, characterized in that the intermediate layer material is supplied as a blank.

1 1. Method according to one of the preceding claims, characterized in that the outer or inner layer material is fed in rolls from rolls.

12. The method according to any one of the preceding claims, characterized in that the outer or inner layer material is supplied as a blank.

1 3. The method according to claim 1 1 or 1 2, characterized in that the web width of the outer or inner layer material is selected according to the circumference of the folding box to be formed in the side wall area plus two strip-like side edges.

1 4. The method according to any one of the preceding claims, characterized in that the base material is cut to length in the fully bonded state.

1 5. The method according to any one of the preceding claims, characterized in that the web-shaped outer layer material and the web-shaped inner material are fed to a nip, which at least one of the facing surfaces of the webs is at least partially provided with an adhesive, the rectangular, the side wall area to be formed Blanks forming blanks from liner material which is stiff in relation to the outer or inner layer material are fed to the roll gap between the other two webs to produce a predetermined distance and that a web-shaped composite material is formed from the two outer webs and the liner material.

1 6. The method according to any one of the preceding claims, characterized in that the outer and inner layer material are bonded to one another over substantially the entire area at all contacting areas.

1 7. The method according to any one of the preceding claims, characterized in that the outer and inner layer material are partially glued together at all areas touching each other.

1 8. The method according to any one of the preceding claims, characterized in that kraft paper is used as the outer and inner layer material.

1 9. The method according to any one of the preceding claims, characterized in that plastic is used as the outer and inner layer material.

20. The method according to any one of the preceding claims, characterized in that a plastic / metal compound is used as the outer and inner layer material.

21. Method according to one of claims 18 to 20, characterized in that the outer and inner layer material is provided on at least one side with a moisture protection coating.

22. The method according to any one of claims 18 or 21, characterized in that a bleached, machine-smooth material without a line with a basis weight of 50 to 80 g / m ^ is used as kraft paper for the inner or outer layer.

23. The method according to any one of claims 18 to 22, characterized in that at least one side of one of the layers is provided with a film with a light blocking effect.

24. The method according to claim 23, characterized in that an aluminum coating is used for the light-blocking effect.

25. The method according to any one of claims 21 to 24, characterized in that a polyethylene coating with 12 to 30 or more g / m ^ is applied as a moisture protection coating.

26. The method according to any one of the preceding claims, characterized in that stiffening recycling material is used as the intermediate layer material.

27. The method according to any one of the preceding claims, characterized in that gray cardboard is used as the intermediate layer material.

28. The method according to claim 26 or 27, characterized in that a gray cardboard with a basis weight from 250 g / m ^ is used.

29. The method according to any one of the preceding claims, characterized in that at least one of the outer or inner layers is glued to the intermediate layer material.

30. The method according to claim 29, characterized in that the bonding is carried out only in partial areas.

31 Method according to one of the preceding claims, characterized in that a releasable pressure-sensitive adhesive is used as the adhesive.

32. A process for producing an intermediate product from base material according to one of the preceding claims, characterized in that the two strip-like edges are connected to one another and folded together onto an adjacent side wall region and fastened there.

33. A method for producing an intermediate product from base material according to one of the preceding claims, characterized in that the strip-like edges are connected by gluing.

34. A method for producing an intermediate product from base material according to one of the preceding claims, characterized in that the strip-like edges are connected by welding.

35. A method for producing an intermediate product from base material according to one of the preceding claims, characterized in that the connected strip-like edges are attached to a side wall region by gluing.

36. A method for producing an intermediate product from base material according to one of the preceding claims, characterized in that the connected strip-like edges are attached to a side wall region by welding.

37. Cutting from multilayer, foldable base material to form folding boxes for flowable media, produced according to at least one of the preceding claims.

38. A method for producing a folding box from a base material or an intermediate product according to any one of the preceding claims, characterized in that after folding the side wall region, the strip-like edge is closed to form a material hose as an intermediate product, and that the lower and upper closure region are closed.

39. A method for producing a folding box from a base material or an intermediate product according to one of the preceding claims, characterized in that the material hose formed as an intermediate product is transported to a filling station.

40. A method for producing a folding box from a base material or an intermediate product according to any one of the preceding claims, characterized in that after closing a closure area, the packaging is filled before the second closure area is completely closed.

41. Folding box made of multilayer, foldable base material, in particular for flowable media, produced according to at least one of the preceding claims.

42. Base material for forming folding boxes for flowable media, produced according to at least one of claims 1 to 31.

43. Cutting from a multilayer, foldable base material to form folding boxes for flowable media, produced according to at least one of claims 1 to 31.