EP0276844A2 - Connecting element for the manufacture of a detachable connection between a pallet and a foldable container of corrugated board or cardboard - Google Patents

Abstract

A connection element (3), consisting of a corrugated cardboard blank, serves for producing a connection, which may be detachable, between a pallet (1) and a foldable corrugated cardboard container (2). The connection element comprises a first flat part (31), which can be attached to the pallet surface, and a second flat part (32) which can be folded towards said first flat part and passes through slots (23) between transverse bottom flaps (21) of the container. In order to provide improved loading conditions for the connection and to allow universal use for different types of pallets, the first flat part corresponds at least to the outside dimensions of half the base area of the container and the second flat part corresponds at least in one main extension, in particular the width, to the corresponding inside dimensions of half the base area of the container. Two connection elements are attached to the pallet surface with the folding lines towards each other, after which the container is placed over the upright second flat parts by means of the slots and the second flat parts securely arrest the transverse bottom flaps (21) and the longitudinal bottom flaps (22) between themselves and the first flat parts under loading conditions and centre the container. <IMAGE>

Description

The invention relates to a connecting element for producing a releasable connection between a pallet and a foldable container made of corrugated cardboard, cardboard or similar material with bottom flaps which are provided with slots in opposite areas, the connecting element being made from a blank made of corrugated cardboard, cardboard or similar material consists of a first surface part which can be fastened to the surface of the pallet and a foldable line against it by a fold line which has slots through the second surface part, and a pallet-container composite produced using such connecting elements.

To produce a pallet-container assembly, a plate-shaped connecting element of the type described in the form of a first bottom section of the container is known (DE-OS 27 09 337, DE-OS 31 04 230). This connecting element has a part to be fastened on the base, ie the pallet, and two further foldable parts which are articulated on the first part and which are adjustable between two end positions and in their first end position enable the container body to be put on. The connecting element is fastened in the upright position of the foldable parts with fastening means on the top of the pallet, inserted into the interior of the container via a bottom cutout and by folding the foldable parts down from above against a second, formed by narrow edge webs bottom portion of the container, which clamps the latter against the base. The transfer of the considerable forces, for example during maneuvering and / or sudden braking during transport on the transport container, takes place essentially on the pallet, at least with regard to the tilting moments and / or shear forces, via the mentioned first part of the first floor section, which Has a centrally extending, long strip.

In order to be able to better control the high forces occurring in this very limited area, which according to statistical values of the German Federal Railways can be up to 5 times the weight in rail traffic, was compared to the previous arrangement (DE-OS 27 09 337) with any fastening means such as conventional brackets created a fastening form by means of flat-head plugs (DE-OS 31 04 230), whereby an increased security of the first floor section against tearing is achieved. Both known arrangements have in common the disadvantage that outside of this middle narrow strip, the contact between the bottom portion of the container and the pallet is achieved solely by the weight of the material stored in the container, so that due to a high center of gravity, but also with insufficient Utilization of the container or in the event of an uneven load in the edge area, there is insufficient contact between the container base and the pallet and there may be deformations in the lower edge area of the carton and thus damage to the partly high-quality packed goods. In addition to these during use as a result of the high loads of up to 5 times the weight of the loading unit that occur during maneuvering and other transport and the resulting deformations, this requires Basic concept of a first bottom section which is provided with such foldable flaps and which fixes the container, the production of relatively wide cutouts in the transverse bottom flaps of the known containers which correspond to the central, first bottom section and which are used to slip the container onto the pallet first floor section are needed. These cutouts, which have to be made to the edge, allow access to the inside of the container from the outside and thus represent a significant risk of theft and robbery, especially in the case of high-quality transport goods, because the container is no longer completely closed to the outside that it is relatively easy to reach inside with a hand.

In another known container-pallet composite (FR-A 23 88 725), instead of the first and second floor sections, circumferential floor strips are provided compared to the known containers described above, so that the risk of theft is reduced if the floor strips along all edges on the Pallet to be attached. However, such attachment is only possible when the container is unfolded. Fastening elements are provided for fastening, which are to be twisted or spread to ensure that the transport container is firmly held on the pallet. Overall, these elements are very complicated to construct and costly, and they also require special measures on the pallet to ensure their safe and functional inclusion. To be able to use these fasteners, you first have to unfold the entire container and align it precisely without any fixation on the pallet in order to gain access to the corresponding holes in the bottom strips through the interior of the container. This means so Probably from an ergonomic as well as from a technical point of view, a burden for the person performing the assembly, especially considering the technically difficult to use rotating or spreading elements and the special measures to be taken on the pallet to securely accommodate them.

In order to achieve an increased resistance to the forces occurring (tilting moments, shear forces) in the known containers with a separate first bottom section, along with simplified assembly and a minimum of blanks and assembly means to be kept available, and the container also as closed to the outside To provide essentially theft-proof unit, in a further known pallet-container assembly (DE-OS 34 15 405), recesses are provided in at least one of the bottom sections lying at the top when the container is folded together, which provide access to an underlying one that can be placed on the pallet Form bottom section and a free passage for fasteners for fastening this lower bottom section in the collapsed state of the blank on the pallet bottom.

A major disadvantage of all these known pallet-container composite arrangements is the fact that they can essentially only be realized on one type of pallet, in particular a wooden or plastic pallet, and a sensible use with disposable corrugated cardboard pallets that are increasingly used today at most with great difficulty, if at all. In addition, due to the fact that the lower edges of the container lie directly on the pallet with higher stacking backs, container damage in the edge area is easy.

The invention is therefore based on the object of providing a connecting element for the simple, economical and effective production of a composite pallet / container, the latter from corrugated cardboard, cardboard or similar foldable material, which has a universal use for a wide variety of pallet shapes and base materials such as wood, Pressed wood, plastic, corrugated cardboard, etc., as well as the creation of a composite with improved load conditions and at the same time high theft security.

This object is achieved according to the invention in the connecting element described at the outset in that the first surface part in its main extensions (length and width) is at least the outer dimensions of half the base area of the container and the second surface part is at least in one main extension (dimension) essentially of the respectively assigned internal dimension of the half of the container base surface corresponds in such a way that the two surface parts in the folded state cover the bottom flaps of a container half from below and above, and in the case of the composite in that two - preferably congruent - connecting elements are each fastened with their first surface parts to the surface of the pallet and these in essentially cover that the folding strip or fold is arranged in the slots in an opposite pair of first bottom flaps of the container and that the second surface parts abut against the bottom flaps of the container from above.

Although it is known (US-PS 29 02 199) to attach a foldable cardboard container on a cardboard or corrugated pallet form the surface with two hinged flaps that overlay part of the bottom flaps of the container while they themselves are covered by a pair of bottom flaps arranged at right angles to them, but the production of such a pallet-container assembly, especially with larger container dimensions, is extremely complicated and generally requires the flaps to be bent or bent. In addition, this known arrangement of a surface with flaps is in one piece and requires extremely large cuts of twice the pallet area and length. There is also no indication of how the person skilled in the art should proceed with given pallets, since the flaps are part of the pallet, are delivered with it and require containers with two parallel slots along two opposite bottom edges.

To produce the composite, two preferably essentially congruent, each essentially half-folded sheets are thus provided, the first surface parts of which are fastened to the pallet with the second surface parts against the fold against one another, and the second, folded-up surface parts of which are held in place by very narrow slits the transverse bottom flaps can be guided into the interior of the container, in order then to be folded down and thus to clamp the bottom flaps of the container onto the pallet, so that they do not require any special fastening. These bottom flaps can be made quite narrow, ie as "stub flaps", but they can also take up the entire bottom of the container. In the first case, the connecting element according to the invention ensures a two-layer container bottom, in the second case even together with the bottom flaps, a three-layer bottom. The slots need practically only have a width corresponding to twice the material thickness of the connecting elements, so that they have only an insignificant effect on the security against theft. On the other hand, such connections enable elements precise alignment of the container on the pallet. Since two first surface parts used together correspond to the outer dimensions of the container, the container walls stand on a smooth surface, which ensures a very advantageous, improved power transmission by the compression pressure occurring in the edge region during stacking being absorbed by the connecting elements, i.e. corrugated cardboard or cardboard can be. As a result of the flat, continuous surface parts on which the bottom of the container stands up fully with its corners and edges, unevenness and irregularities, which occur particularly with plastic, wood and pressed wood pallets, and damage the container and thus impair the stacking Resistance to compression can be balanced. On the other hand, the two second surface parts in the composite essentially correspond to the inner dimensions of the container and thus allow a very exact centering of the container on the pallet, while at the same time achieving a flat floor surface in contrast to conventional floor flap arrangements, which for certain, e.g. Stability of their contour sensitive goods is advantageous. Since the filler material of the container presses on the surface parts and bottom flaps and thus largely holds the container in place by this pressure, additional tensioning straps or similar measures to maintain precise alignment are practically unnecessary. The connecting elements can first be fastened on the pallet on their own, ie no intervention through the erected container is necessary to attach the last fastening elements. A very significant advantage is the universal use of such connecting elements for all pallet shapes and types that are considered today, such as corrugated cardboard, wood, pressed wood and plastic pallets, but also pallets of any other type stenz, because the fastening options for the connecting elements are freely variable. In other words, depending on the structure of the surface of the pallet, any type of stopper, clamps, clamping elements or the like can be in the edge area or other punching areas. are attached, while in the case of pallets with a largely closed surface such as corrugated cardboard pallets, a practically all-over, at least large-area gluing can take place. This extends the range of use of corrugated cardboard pallets, whereby even a mechanical attachment of the connecting elements during the manufacture of the pallet itself is possible, ie the corrugated cardboard pallet can be assembled with articulated clamping base parts and the pallet can thus be prepared to a very large extent in the fully-automatic frame. - Of course, it is also conceivable to provide two non-congruent connecting elements, that is to say asymmetrical with respect to the container base area, but this would be disadvantageous and impractical with regard to the manufacturing effort and the storage (storage) as well as the assembly, especially since the free interchangeability would be impaired. It should also be pointed out that the connecting elements are also suitable for the production of a composite of containers with pallets, if the containers have a very rectangular, other than square, plan, for example are octahedral or have other polygonal shapes. In doing so, only the contours of the second surface part will be designed according to the inner shape of the container, that is to say adapt it, while for the first surface parts such an adaptation to the outer contours is possible, but is not absolutely necessary, as long as the pallet surface dimension is maintained and the first surface part over the outer edges of the container protrudes.

According to a preferred embodiment of the invention it is provided that the two surface parts by two other fold lines which are essentially at a distance corresponding to the thickness of the container base and which define a narrow strip that forms the fold between them can be folded against one another. This makes assembly easier and the bottom flaps of the container can be neatly embraced when it is erected. The length of the narrow strip running between the two fold lines is preferably equal to the length of the second surface part, so that the narrow strip rests against the inside of the container wall.

Although it is possible for the second surface part to only take up a part of the transverse extent of the container, it is particularly advantageous if the area of the blank substantially corresponds to the surface of a pallet with which the connecting element can be used and the second surface part and the fold area or the fold strip jump inwards by the thickness of the container material in relation to the first flat part. This creates a firm, practically double container bottom, so that a very firm bond results. The increased material expenditure can be at least partially compensated for by the above-mentioned design of the bottom flaps arranged on the container side walls as pure stub flaps.

As already mentioned, the connecting element according to the invention enables universal use for a wide variety of container shapes. In order to do justice to these possible variations in a simple manner, a number of holes for receiving fastening elements can advantageously be provided in the region of the free edge of the first surface part opposite the folding edge. These holes are preferred in the for the respective container shapes and pallet structures possible distances are provided, ie a grid of holes for standard container types is possible. These holes do not interfere with full-surface gluing, for example when used on corrugated cardboard pallets, but they may even serve as centering for the connecting elements to be glued on, for example when assembling on machines.

In order to enable the container to be easily placed on the pallet after the connecting elements have been fastened, at least two punched-outs in the form of elongated, double-sided punched-out tongues, which can be folded out of the surface of the second flat part, can expediently be provided in the region of the free edge of the second flat part opposite the folding edge are. This eliminates the need for additional holding elements, since the upstanding second surface parts can be fastened by means of these tongues. A particularly effective, simple fastening is obtained if, according to another development of the invention, a first punched-out shape as a rectangular tongue and a second, spaced-apart punched-out shape as a region in its other surface edge, which is preferably conically widened, its remaining punched-out length with respect to its width first punching of corresponding locking tabs is formed. The punched holes provided in the second surface parts are each assigned to one another in pairs in such a way that a locking tab in the cutout formed by a tongue can be easily releasably locked when the composite is produced.

As already indicated, the pallet can be a corrugated cardboard pallet, in which case the first surface parts are preferably glued to the pallet surface over a large area are. If, on the other hand, the pallet is a wooden, pressed wood or plastic pallet, the first surface parts are connected to it by means of fastening plugs which are known per se and penetrate the holes. In this case, as also indicated, the holes are provided in the first surface parts according to a fastening element pattern specified for different types of pallets.

• Fig. 1 das Aufrichten eines unter Verwendung erfindungsgemäßer Verbindungselemente hergestellten Palette-Behälter-Verbundes,
• Fig. 2 ein erfindungsgemäßes Verbindungselement in teilweise gefaltetem Zustand,
• Fig. 3 eine Einzelheit III der Fig. 2 in etwas abgewandelter Ausbildung,
• Fig. 4 in ausschnittsweiser Darstellung den Quer-­(Breit-)Randbereich eines Zuschnitts für ein erfindungsgemäßes Verbindungselement im ungefalteten Zustand,
• Fig. 5 eine ausschnittsweise Darstellung des Querrandbereiches zweier gegeneinander angeordneter Verbindungselemente nach Faltung in Draufsicht,
• Fig. 6 eine Seitenansicht der Fig. 5,
• Fig. 7 eine axonometrische Ansicht der Anordnung der Fig. 5 und 6,
• Fig. 8 eine Verbundanordnung für eine Wellpappe-­Palette,
• Fig. 9 eine Verbundanordnung für eine Kunststoff­palette und
• Fig. 10 eine Verbundanordnung für eine Holzpalette.

Further advantages and embodiments or possibilities of the invention emerge from the following description of the exemplary embodiments shown in the schematic drawing. It shows

• 1 shows the erection of a pallet-container assembly produced using connecting elements according to the invention,
• 2 shows a connecting element according to the invention in a partially folded state,
• 3 shows a detail III of FIG. 2 in a somewhat modified design,
• 4 is a partial representation of the transverse (wide) edge area of a blank for a connecting element according to the invention in the unfolded state,
• 5 is a partial representation of the transverse edge area of two mutually arranged connecting elements after folding in plan view,
• 6 is a side view of FIG. 5,
• Fig. 7 is an axonometric view of the arrangement 5 and 6,
• 8 shows a composite arrangement for a corrugated cardboard pallet,
• Fig. 9 shows a composite arrangement for a plastic pallet and
• Fig. 10 shows a composite arrangement for a wooden pallet.

Fig. 1 shows the production of a composite between a pallet 1, here in the form of a disposable pallet made of corrugated cardboard, and a corrugated cardboard folding container 2, using two constructed according to the invention and explained in more detail below with reference to FIGS. 2 to 7 Connecting elements 3. The pallet is of such a customary construction, with a corrugated cardboard pallet 1a, a plastic or pressed wood pallet 1b being used for the production of the composite according to the invention, as shown in FIGS. 8 to 10 , but also a normal wooden pallet 1c or any other pallet structure comes into consideration. The container 2 is a conventional folding box with bottom flaps 21 and 22, a slot 23 being located between a pair of opposing bottom flaps, here in the form of transverse wall bottom flaps 21, through which the connecting elements 3 are guided in the manner to be described.

The connecting element 3 is formed from a substantially flat-rectangular blank 30 made of single-ply corrugated cardboard, but also other similar foldable material such as solid cardboard with corresponding properties, laminated corrugated cardboard or cardboard material, multi-ply corrugated cardboard or the like, depending on the application requirements , comes into consideration. This cut can be a stamped part which can be produced on conventional corrugated cardboard production plants, although there are also no restrictions with regard to production here.

The blank 30 comprises, in its width extension B, which can be seen in FIG. 4, a first and a second surface part 31 or 32 in one piece and foldable against one another next to one another. In the longitudinal extension L indicated in FIG. 1, the first surface part 31 corresponds to the outer length of the container 2 and, at least in this case, also the length of the pallet 1. The width B 31 of the first surface part 31 corresponds at least to the distance from the slot 23 to the outer edge of the container, in the present exemplary embodiment with a centrally arranged slot 23, that is to say essentially half the container -External width. The length of the second surface part 32 is reduced in relation to the total length L and thus offset from the first surface part 31 in such a way that it essentially corresponds to the inner length dimension of the container 2. This results in an offset shown in FIG. 4 in the middle area. The width B 32 of the second surface part 32 is somewhat smaller than the width B 31 of the first surface part 31 and corresponds to the distance from the slot 23 to the inner wall of the container, in this case approximately half the inner width of the container. The two surface parts 31, 32 can be folded against one another by a first and a second folding line 34 or 35. Between these two fold lines 34, 35, a fold strip 33 running in the longitudinal direction is determined. Its width is provided essentially in accordance with the material thickness of the container 2 to be fastened, that is to say the material thickness of the bottom flaps 21. In order to enable the second flat part 32 to be unfolded and folded over in the manner shown in FIGS. 5 to 7, a short cut 38 is made in the container part 31 as an extension of the outer edge of the second flat part 32 up to the first Fold line 34 is provided, which in turn ends at this incision 38, that is, is not carried out to the outer edge of the first flat part 31. The blank 30 can thus be folded in the manner shown in FIGS. 5 to 7, so that the second surface part 32 comes into a substantially parallel position to the first surface part 31, the distance between the two being essentially due to the folding strip or fold 33 is determined and the material thickness of the container bottom flaps 21, 22 corresponds. Two such folded blanks are placed against each other in mirror image in the manner shown in FIGS. 5 to 7. This results in the basic arrangement shown in FIG. 1, the two butt abutting surface parts 31 fully covering the undersurface of the pallet 1 of the container 2 and, if the dimensions of the container 2 essentially correspond to the surface of the pallet, cover the latter. The two second surface parts 32 are shown folded vertically.

After the attachment of the first surface parts 31 to the pallet surface described below, as can also be seen from FIG. 1, the container 2 can be placed by surrounding the upright second surface parts 32 with the aid of the slot 23, so that the bottom flaps 21 on the lie on the first surface parts, whereupon the container is then folded down and the free transverse wall bottom flaps 21 are likewise brought into a position comprising the second surface parts 32 after the longitudinal wall bottom flaps 22 have been folded in beforehand. The container 2 is then finally locked on the pallet by folding the second surface parts 32 from the vertical position in FIG. 1 into a horizontal position parallel to the first surface parts 31. Since the width B 32 of the second surface parts 32 essentially corresponds to the internal dimensions of the container ters corresponds, the second surface parts 32 lie snugly against the inner wall of the container 2, so that it is held in a stable position and is centered.

The - already indicated - fastening of the first surface parts 31 on the pallet surface for fixing the mounting position of FIG. 1 can be done in different ways. If a corrugated cardboard pallet 1a is used as in FIG. 8, then a full-surface gluing with the pallet surface will be provided, while the one with a plastic or press material pallet 1b (FIG. 9) or a wooden pallet 1c (FIG. 10) Fixing expediently carried out with the aid of plugs which can be inserted into corresponding holes 311, 312 (see FIG. 2) provided for this purpose. The pattern of these holes is based entirely on the fastening pattern of conventional pallets and can be selected accordingly. It is advisable to provide different mounting hole patterns for different types of pallets. These holes do not interfere with gluing in the case of corrugated cardboard pallets 1a.

In order to maintain the two second surface parts 32 in the vertical assembly state according to FIG. 1 and thus to be able to ensure that the container 2 is placed in a simple manner, the second surface parts are provided with first and second punched-out areas 36 and 37 in the area of their free longitudinal edge recognizes this in detail in FIG. 3. The first punched-out 36 is a narrow, parallel folding strip that can be pushed out, while the second punched-out 37 has a conical (FIG. 2) or trapezoidal (FIG. 3) widened head part and its base is essentially the same Width corresponds to the first punched-out 36, so that these punched-outs with a mirror-image arrangement of two connecting elements elements 3 on a pallet can be pressed into each other in such a way that the widened head portion of the second punched-out 37 engages through the first punched-out 36 and is easily detachably locked in the pressed-in first punched-out 36 by its parallel boundary edges. This locking can also be released again easily if the two second surface parts are pressed down in the direction indicated by the arrows in FIGS. 8 to 10 in order to overlap the bottom flaps 21 and 22 of the container 2 and thus fix the container on the pallet 1.

It is readily apparent that the bottom flaps 21 and 22 of the container 2 can be designed as stub flaps as long as they ensure a sufficient support of the second surface parts 32 from above and thus ensure that the container is fixed relative to the pallet. However, it is also conceivable that the surface area of the second surface parts 32 is made smaller if very large bottom flaps are provided on the container. However, it must be taken into account that, at least in the longitudinal extent, the second surface parts 32 should bear against the container walls in order to ensure sufficient centering and to prevent the container from shifting on the pallet when loaded.

In other words, the fact that the second surface parts 32, which form a flat bottom surface, against the inner walls of the container, in conjunction with the secure fastening of the first surface parts 31 on the pallet surface, decisively establishes the stable transport connection, while the outer surface edges are protected by the first surface parts 31 to protect this edge area is reached at high loads during transport. By bringing in the transport material the second surface parts 32 are pressed firmly against the pallet, so that the container 2 is centered and immovably stuck on the pallet, while the first surface parts, in addition to their function of fastening on the pallet surface, also serve as a buffer between the easily deformable container edge and a substantially resistant pallet surface.

Claims (13)

1. connecting element for producing a releasable connection between a pallet and a foldable container made of corrugated cardboard, cardboard or similar material with bottom flaps which are provided with slots in opposite areas, the connecting element consisting of a blank made of corrugated cardboard, cardboard or similar material, which has a first surface part which can be fastened to the surface of the pallet and a second surface part which can be folded against it by a folding line and which penetrates the slots, characterized in that the first surface part (31) has at least the outer dimensions of half the base surface in its main dimensions (length and width) of the container (2) and the second surface part (32) at least in one main extent (dimension) essentially corresponds to the respectively assigned internal dimension of half the container base surface in such a way that the two surface parts (31, 32), when folded, the bottom flaps (31, 32) one Cover half of the container in a sandwich from below and above. 2. Connecting element according to claim 1, characterized in that the two surface parts (31, 32) by two mutually substantially at a distance corresponding to the thickness of the container bottom folding lines (34, 35) can be flattened against each other, a narrow strip between them ( 33) determine. 3. Connecting element according to claim 2, characterized in that the length of the narrow strip (33) is equal to the length of the second surface part (32). 4. Connecting element according to one of claims 1 to 3, characterized in that the surface of the blank (30) substantially corresponds to the surface of a pallet (1) with which the connecting element can be used, and the second surface part (32) and the folding area or the folding strip (34, 35) jump inwards by the thickness of the container material with respect to the first flat part (31). 5. Connecting element according to one of claims 1 to 4, characterized in that a number of holes (311, 312) for receiving fastening elements (4) is provided in the region of the free edge of the first surface part (31) opposite the folding edge. 6. Connecting element according to one of claims 1 to 5, characterized in that in the region of the folding edge opposite the free edge of the second surface part (32) at least two punched-outs (36, 37) are provided in the form of elongated, double-sided punched tongues which are made of Surface of the second surface part can be folded out. 7. Connecting element according to claim 6, characterized in that a first of the punched-out as a rectangular tongue (36) and a second, spaced-apart punched-out as in its area located on the area edge, preferably conically widened, on its remaining punched-out length with respect to its width of the first Punching corresponding locking tabs (37) is formed. 8. Using connecting elements according to one of claims 1 to 7 manufactured pallet-container assembly, characterized in that two connecting elements (3) with their first surface parts (31) are each attached to the surface of the pallet (1) and this in essentially cover that the folding strip or fold (33) is arranged in the slots (23) in an opposite pair of first bottom flaps (21) of the container and that the second surface parts (32) from above against the bottom flaps (21, 22) of the container. 9. Pallet-container assembly according to claim 8, characterized in that the two connecting elements (3) are congruent. 10. Pallet-container assembly according to claim 8 or 9, characterized in that the pallet (1) is a corrugated cardboard pallet and the first surface parts (31) are glued to the pallet surface. 11. Pallet-container assembly according to claim 8 or 9, characterized in that the pallet (1) is a wooden, pressed wood or plastic pallet and the first surface parts (31) with it through known, the holes (311, 312) through fastening plugs (4) are connected. 12. Pallet-container assembly according to claim 11, characterized in that the holes (311, 312) are provided in the first surface parts (31) according to a fastener pattern that is specified for different types of pallets. 13. Using connecting elements according to claim 6 or 7 produced pallet-container assembly according to one of claims 8 to 12, characterized in that the punched-out portions (36, 37) provided in the second surface parts (32) are each assigned to one another in pairs that a locking tab (37) in the cutout formed by a tongue (36) is easily releasably locked when producing the composite.

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