Stand-up display having a cardboard basic body

Abstract

The invention relates to a stand-up display (10) having a planar basic body (12) made of cardboard. A first and second planar portion (14a, 14b) are connected to one another in an articulated manner by means of a stand-up hinge (16). Inner surfaces of a first and second planar covering body (18a, 18b) made of cardboard lie on inner surfaces of the first and second planar portion (14a) and are partially adhesively bonded thereto. Between the inner side of the first covering body (18a) and the inner side of the first planar portion (14a) and also between the inner side of the second covering body (18b) and the inner side of the second planar portion (14b) there are formed a first and second adhesive-free pocket region (22a, 22b) which adjoin the stand-up hinge (16). A flat metal strip (20) is arranged bridging the stand-up hinge (16) while having a first part arranged in the first pocket region (22a) and a second part arranged in the second pocket region (22b) and is held so as to be displaceable in at least one of the pocket regions (22a, 22b) without material connection to the respective covering body (18a, 18b) and planar portion (14a, 14b).

Description

[0001] The invention relates to a display stand, a method for erecting the stand, and a method for producing the stand. In particular, the invention relates to displays with a flat base made of cardboard.

[0002] A stand is understood to be a structure or body designed to be raised above a flat surface, i.e., so that the stand rises above the flat surface. A stand can, for example, have one or more bases and / or edges with which it stands or rests on the surface. Such stands can be used, for example, as a sign, advertising medium, or other perceptible mark. In particular, a stand can be provided with an inscription and / or an image that is easily visible due to the position in which it is erected.

[0003] WO 2009 / 052240 A1 describes a support element made of a slightly flexible material that is capable of maintaining its bent position without further bending force. Pressure-sensitive adhesive surfaces allow the element to be removably bonded to surfaces such as cards or paper objects to provide support.

[0004] KR 1020180122833A describes a material for displaying information, comprising a main body made by attaching printing paper to panels made of plastic, foam, or wood materials. The main body has first and second supports folded relative to the main body to form a fold. A sheet metal piece is attached over the fold.

[0005] US20210 / 0319607A1 discloses a foldable cone with first and second side walls that taper upwardly. Each side wall has an outer surface, an inner surface, a lower edge, a top edge, and opposite side edges. The cone further comprises a base panel having a fold seam extending along its central portion in a direction generally parallel to the lower edges of the side panels, wherein the base panel is folded along the fold seam. The first and second side walls are secured to each other at a predetermined location to form concave first and second side walls when the base panel is unfolded.

[0006] WO 2019 / 156436 A1 describes an information board comprising first and second product sections which are connected to one another for folding along a fold line. The first and second product sections face one another and have respective lower sections to be laid on the floor. A connecting plate and a reinforcing element are sequentially attached to each of the mutually facing inner surfaces of the first and second product sections, the connecting plate being a plate element having a connecting section formed thereon. The reinforcing element is a plate element covering the connecting plate and having a through section through which the connecting section of the connecting plate extends in an exposed manner. Connecting means are provided on the mutually facing rear sides of the first and second product sections, respectively.of the second product part and connect connecting portions which are exposed to each other by extending through the through portions of the reinforcing elements.

[0007] GB 1 601 120 A describes an article comprising two parts and a flexible support element adhesively secured to the two parts to maintain them in a desired orientation relative to each other while allowing adjustment to different orientations. The support element comprises two webs with at least one longitudinal stiffener disposed therebetween, the stiffener or stiffeners providing sufficient rigidity to the support element to maintain the parts in the desired orientation.

[0008] It can be regarded as the task of proposing a display, a method for setting up the display and a method for producing the display, with which a display which can be used as a sign or advertising medium and which has an attractive appearance can be produced in a particularly simple and cost-effective manner.

[0009] The object is achieved by a stand according to claim 1 and by the methods according to claims 11 and 12. Dependent claims relate to advantageous embodiments of the invention.

[0010] The inventor started from the realization that for a display intended for use as a sign and / or advertising medium, an initially flat shape is crucial, both for production, especially for possible printing, as well as for storage and shipping. However, for use as a display, a three-dimensional shape should be produced as simply as possible.

[0011] The display stand according to the invention comprises at least one flat base body and a first and a second flat cover body, each of which is made entirely or partially of cardboard. The term "cardboard" is understood here to mean any flat, rigid paper product, in particular with a basis weight of at least 150 g / m². This includes, in particular, cardboard and thicker paper. The term can refer to single-layer and multi-layer products, including structural products such as corrugated cardboard.

[0012] The flat base body comprises at least a first and a second flat section, which are hingedly connected to one another by a folding fold. The folding fold is preferably embossed or otherwise manufactured such that the flat sections can be pivoted relative to one another by bending or folding the material along the folding fold. The predefined folding fold determines the course of the pivoting edge when the base body is folded. This can ensure, for example, a straight fold at the desired position.

[0013] An inner surface of the first cover body lies on an inner surface of the first flat section of the base body and is partially glued to it. An inner surface of the second cover body lies on an inner surface of the second flat section and is partially glued to it. While the overlap can also be only partial, the inner sides of the first and / or second flat section are preferably predominantly (i.e. more than 50% of the area) and particularly preferably at least almost completely (i.e. at least 90% of the area) covered by the respective cover body. The first and second cover bodies can be separate cardboard elements, but they can also be formed with each other and / or with the base body from a continuous piece of cardboard, for example divided by folds. The bond can be formed using various possible types of adhesive and by various possible methods of application.For example, the bond can be formed by chemically or physically setting adhesives, e.g., solvent-based adhesives, hot melt adhesives, polymerizing adhesives, etc. The use of pressure-sensitive adhesives is also possible. The adhesive can be sprayed, printed, or applied in another way. Particularly preferably, the bond can be formed by one or more adhesive tapes, preferably double-sided adhesive tapes, e.g., carriers with adhesive surfaces on both sides, preferably with pressure-sensitive adhesive. Preferably, one or more strips of double-sided adhesive tape are arranged between the cover body(s) and the inner surface(s) to form flat adhesive areas.

[0014] A first and a second adhesive-free pocket region are formed between the inner side of the first cover body and the inner side of the first flat section, as well as between the inner side of the second cover body and the inner side of the second flat section. An adhesive-free pocket region is defined as a continuous surface area where the inner sides of the cover body and the flat section lie on top of one another but are not connected by adhesive. The adhesive-free pocket regions each border the folding fold; preferably, they are located directly opposite one another at the folding fold.

[0015] According to the invention, a flat metal strip is arranged so as to bridge the fold, with at least a first part, preferably comprising a first end of the metal strip, in the first pocket area and a second part, preferably comprising a second end of the metal strip, in the second pocket area. The metal strip is held in at least one of the pocket areas without any material connection to the respective cover body and flat section and is therefore held so as to be displaceable - at least to a small extent, i.e. in particular without gluing. Displaceability is preferably provided at least in the longitudinal direction, i.e. transversely to the course of the fold. A minimum degree of displaceability in the range of, for example, 1 mm or even less can be sufficient, as explained in more detail below. While the metal strip can, for example, only be received at the respective ends in the pocket areas, it is preferred if it is held - apart from a possiblyshort free area at the folding fold - over at least substantially the entire length (i.e., for example, more than 90% of the length) is taken up in the pocket areas.

[0016] According to the invention, such a stand can be converted from a flat arrangement in which the first and second sections are arranged in alignment with one another in a plane by pivoting the first and second sections relative to one another about the support fold into an angular arrangement in which the first and second sections are arranged at an installation angle to one another. The installation angle can be, for example, 120° or less, preferably 100° or less. The metal strip plastically deforms during pivoting and, in the angular arrangement, holds the first and second sections at the installation angle to one another.

[0017] The manufacturing method according to the invention provides for the provision of the flat base body made of cardboard with the first and a second flat section and the folding fold that connects them to one another in an articulated manner. The inner surfaces of the first and second flat cover bodies made of cardboard are applied to the first and second flat sections and partially glued to them, whereby a first adhesive-free pocket area is formed between the inner side of the first cover body and the inner side of the first flat section, which borders the folding fold, and a second adhesive-free pocket area is formed between the inner side of the second cover body and the inner side of the second flat section, which also borders the folding fold.The flat metal strip is arranged to bridge the fold, with a first part in the first pocket area and a second part in the second pocket area. The metal strip is held movably in at least one of the pocket areas without any material connection to the respective cover body and flat section. The sequence of the process steps is not mandatory; for example, the metal strip can be arranged during the formation of one or both pocket areas or can be added subsequently.

[0018] To ensure the correct angle of support, a steel sheet with a thickness of 0.1 to 0.15 mm has proven to be suitable for the metal strip. In general, the material, thickness, and width of the metal strip should be selected to ensure good bendability while also providing sufficient holding force.

[0019] The metal strip can be arranged completely on one or both sides of the fold, i.e. with its entire surface within the adhesive-free pocket area, so that on at least one of the sides it is held over its entire surface without any material connection only by the boundaries of the pocket area, i.e. in particular not by adhesive. Alternatively, however, it can also be provided that - at least on one side - the metal strip is located with the predominant (i.e. more than 50%, preferably more than 75%, particularly preferably more than 90%) portion of its surface on the respective side of the fold in the adhesive-free pocket area, but is nevertheless fixed by adhesive at one or more points, e.g. at one or more edges of the respective adhesive-free pocket area.In particular, with a partially flexible adhesive and only a small surface area, the metal strip can still move by the required minimum amount when bent, despite the proportionally low bonding.

[0020] The stand according to the invention and the method according to the invention thus allow the production of a three-dimensional shape of the stand in a particularly simple manner. By plastically deforming the metal strip, a desired installation angle, created by pivoting, can be maintained.

[0021] The stand according to the invention is particularly suitable for a visually appealing presentation, for example as an advertising medium. For this purpose, one or both of the outer surfaces opposite the inner surfaces of the first and / or second flat section can be printed. The stand-up fold allows a precisely located, straight edge to be produced. The movable nature of the metal strip prevents compression of the metal strip and / or the material of the base body when pivoting, thus preventing cracks, bulging, and other undesirable deformations, particularly on the outer surfaces. By only partially bonding the inner surfaces of the cover body and base body, a pocket area ideally suited to receiving the metal strip is created in a particularly simple manner.

[0022] It is possible for the metal strip to be held displaceably in only one of the pocket areas, while being fixed in the other pocket area. Preferably, the metal strip is held displaceably in both pocket areas relative to the base body and the cover bodies without any material connection. This has proven advantageous for preventing or reducing deformation, particularly of the base body, when setting up the stand, i.e., when pivoting the flat sections relative to each other to create an angular arrangement.

[0023] Preferably, the inner surface of the first cover body is bonded to the inner surface of the first planar section in a first bonding area, wherein the first bonding area surrounds the pocket area on three sides. Thus, the pocket area is surrounded by a continuous bonding area, wherein the fourth side is preferably formed by the folding fold. Similarly, a second bonding area can preferably be formed between the second cover body and the second planar section, which bonding area surrounds the second, non-adhesive pocket area there.

[0024] According to a further development, the first and / or second cover body can be formed as a single piece with the base body. For this purpose, for example, the respective cover body can be hingedly connected to the first and / or second section by a closing fold. The respective cover bodies can then be placed onto the inner surface of the respective section of the cover body by folding them over at the closing fold. Particularly preferably, the base body can thus be formed as a single piece with both cover bodies. The closing fold more preferably runs parallel to the support fold.

[0025] The inside of the base body can, for example, be completely covered by the two cover bodies. However, an arrangement in which the folding fold on the inner surface of the base body is not covered, or not completely covered, by the cover bodies is preferred.

[0026] According to a preferred embodiment, the first and second cover bodies are arranged at a distance from one another along the folding fold. This makes it particularly easy to pivot the sections relative to one another around the folding fold in order to create an angular arrangement. Due to the distance and the resulting free space between the internally arranged cover bodies, no or less material needs to be displaced during pivoting or folding. This reduces or completely prevents an otherwise possible undesired deformation of the flat sections and the folding fold. The distance between the first and second cover bodies can be, for example, 0.3 to 5 mm, preferably 0.5 to 3 mm, particularly preferably 1 - 2 mm.

[0027] For this purpose, it may be preferable, for example, for the first and / or second section of the base body to have a length (measured at right angles to the folding fold) that is greater than the respective length of the associated cover body. A shorter design of the cover body can create a gap or a free area on the inside of the folding fold, which simplifies folding along the folding fold and can prevent or reduce unwanted deformation.

[0028] For example, the length of the first and / or second section of the base body may be 0.2 to 2 mm greater than the length of the first and / or second cover body.

[0029] The dimensions of the stand as a whole and in particular of the pocket areas can be selected differently for different requirements. According to a preferred embodiment, the first and / or the second pocket area can have a length, measured in each case at right angles to the stand-up fold, which is less than 80% of the length of the first and / or the second section. The respective pocket area (and preferably also the metal strip accommodated therein) then extends only over a part of the length of the respective section of the base body. Preferred dimensions for the length of the respective pocket area and / or the length of the respective part of the metal strip accommodated therein can, for example, be at least 10%, preferably at least 20% of the length of the respective section.

[0030] According to a preferred embodiment, at least one slot can be formed on the first and / or second planar section and / or on the first or second planar cover body, penetrating the planar section or cover body. The slot can be positioned and dimensioned such that the metal strip can be inserted into the first and / or second pocket area. Preferably, only one slot is formed on one of the pocket areas, particularly preferably in the region of its end facing away from the folding fold. The slot is preferably arranged such that the metal strip can be pushed through in the longitudinal direction.

[0031] Embodiments of the invention are described in more detail below with reference to the drawings. In the drawings: Fig. 1 shows a perspective view of a first embodiment of a stand in a spatial form of use; Fig. 2 shows the stand from Fig. 1 in a plan view of an unfolded form; Fig. 3a-3cSteps of manufacturing the stand from Fig. 1, Fig. 2 starting from the unfolded form Fig. 2 ; Fig. 4 a partially shown cross-section through the stand on Fig. 1-3c in a planar arrangement according to Fig. 3c Fig. 5, 6 in perspective views a second embodiment of a stand in its spatial use form; Fig. 7 a partially shown cross section through the stand on Fig. 5, 6 in a flat arrangement.

[0032] Fig. 1 shows a first embodiment of a stand 10, in which two flat sections 14a, 14b of a cardboard base body 12 form an angular arrangement in which they are arranged at an angle α to each other. Such a stand 10 can serve, for example, as a sign or advertising medium, wherein the Fig. 1 The outer surfaces of the base body 12 shown above can be printed. The stand can be designed as shown in Fig. 1 shown on edges of the planar sections 14a, 14b of the base body 12 or, in particular with an installation angle α of less than 90°, also on one of the outer surfaces, as shown below with reference to a second embodiment ( Fig. 5, 6 ) is shown.

[0033] The prerequisite is that the installation angle α is maintained, which is not guaranteed by the cardboard material of the base body 12 alone. As in Fig. 1 and will be explained in more detail below, the stand 10 has a concealed metal strip 20 which is plastically deformable when the flat sections 14a, 14b of the base body 12 are pivoted about a folding fold 16 and thus in the angular position of Fig. 1 maintains the achieved installation angle α.

[0034] Fig. 2 shows the stand 10 in an unfolded form. The base body 12 with the flat sections 14a, 14b and the stand-up fold 16 formed therebetween is formed in one piece from cardboard material with a first and a second flat cover body 18a, 18b, which are foldable, i.e., hingedly connected, to the base body 12 via end folds 28a, 28b. Measured at right angles to the stand-up fold 16, in the embodiment shown, the flat sections 14a, 14b of the base body 12 each have identical lengths B1, and the adjoining cover bodies 18a, 18b also have identical lengths B2 (although the lengths may differ in different embodiments). The length B2 of each of the cover bodies 18a, 18b is shorter by a certain amount, for example 1-2 millimeters, than the length B1 of the respective adjacent flat section 14a, 14b of the base body 12.

[0035] Adhesive areas 24a, 24b are formed on the inner surface of the base body 12, each of which surrounds adhesive-free areas 22a, 22b on three sides. The adhesive-free areas 22a, 22b are located opposite each other via the folding fold 16.

[0036] The sequence of Figuren 3a- 3c shows steps in the production of the stand 10 in a possible sequence. Starting from a flat piece of cardboard material, which is divided into the flat sections 14a, 14b and cover bodies 18a, 18b by introducing the stand fold 16 and the end folds 28a, 28b, after applying adhesive to the adhesive areas 24a, 24b (in Fig. 3a-3c not shown) by folding the inner sides of the flat sections 14a, 14b and the cover bodies 18a, 18b onto each other at the end folds 28a, 28b. Before this, the central adhesive-free areas 22a, 22b (in Fig. 3a-3c (also not shown) the metal strip 20 is applied. Alternatively, the metal strip 30 can also be inserted subsequently.

[0037] By folding the cover bodies 18a, 18b, their inner sides and the inner sides of the flat sections 14a, 14b adhere to each other through the adhesive areas 24a, 24b. The adhesive-free areas 22a, 22b form pockets between the inner sides, into which the metal strip 20 is received. This is shown in section in Fig. 4 shown. The metal strip 20 bridges the folding fold 16 and is accommodated on both sides in adhesive-free pocket areas 22a, 22b. Thus, the metal strip 20 is clamped between the inner surfaces of the flat sections 14a, 14b and the cover bodies 18a, 18b, but without any material connection, ie, in particular, without adhesive bonding.

[0038] The adhesive-free pocket areas 22a, 22b are dimensioned somewhat larger than the metal strip 20, so that the latter is accommodated therein with a certain amount of play, ie can be displaced parallel to the inner surfaces to at least a small extent.

[0039] How to continue in Fig. 4 As shown, when the cover bodies 18a, 18b are folded over in the area of ​​the folding fold 16, a free area 26 is formed between their edges, ie they form a distance of, for example, a few millimeters there.

[0040] The thus formed and in Fig. 4 The structure shown is particularly well suited for folding around the folding fold 16, i.e. for pivoting the flat sections 14a, 14b against each other to form the folding angle α. The position and straight course of the folding fold 16 embossed into the material are predetermined. During folding, the metal strip 20 deforms plastically, but can move within the adhesive-free pocket areas 22a, 22b so that there is no stretching or compression of the cardboard material, which could otherwise lead to undesirable deformation or even tearing of the material. Due to the free area 26, the edges of the cover bodies 18a, 18b do not abut one another (or at least not to a significant extent), so that here too, material compression is avoided or at least reduced.

[0041] Thus, with the illustrated structure of the stand 10, it can be set up particularly easily and stably starting from an initially flat arrangement (see e.g. Fig. 3c ) the angle arrangement ( Fig. 1 ) of the stand 10. The stand 10 can thus be processed (e.g. printed), stored and / or transported or shipped in a flat arrangement and only converted into the angular arrangement ( Fig. 1 ) can be brought.

[0042] Various variations of the embodiment shown are possible. For example, the adhesive areas 24a, 24b are shown protruding from the inner sides of the planar sections 14a, 14b of the base body 12; alternatively or additionally, adhesive can also be applied to the inner sides of one or both of the cover bodies 18a, 18b during production. While the above assumed continuous, flat adhesive areas 24a, 24b, adhesive can also be applied intermittently in these areas, for example, in dotted or linear patterns. The dimensions shown and relative dimensions of the planar sections 14a, 14b of the base body 12 as well as the adhesive-free areas 22a, 22b and the metal strip 20 are merely examples and can vary for different designs. In particular, the base body 12 does not have to be divided symmetrically as shown, but one of the planar sections 14a, 14b can differ in size and / or shape from the other section.

[0043] Fig. 5 - 7 show a stand 110 according to a second embodiment. The stand 110 according to the second embodiment largely corresponds to the stand 10 according to the first embodiment. Identical parts and elements are provided with identical reference numerals. Only the differences will be discussed in more detail below.

[0044] The stand 110 according to the second embodiment has surfaces of different lengths, i.e., the first flat section 14a and the first flat cover body 18a have, measured from the fold 16, a significantly greater length than the second flat section 14b and the second flat cover body 18b. The length can, for example, correspond to at least twice the length of the second flat section 14b and cover body 18b. The angle α is less than 90°. Thus, the stand 110 is particularly suitable for being placed on the shorter second flat section 14b as a base, so that the first flat section 14a stands upright, for example as a sign, as in Fig. 5 shown.

[0045] To insert the metal strip 20, the second flat section 14b, ie on the underside of the foot (see Fig. 6 ), a slot 30 is formed which penetrates the second planar section 14b and makes the pocket area 22b formed between the second planar section 14b and the second planar cover body 18b accessible. In Fig. 7 This is shown in section. The slot 30 is arranged at the longitudinal end of the pocket area 22b so that the metal strip 20 can be inserted through the slot 30 into the pocket areas 22a, 22b.

Claims

1. Display stand (10), with - a planar base body (12) made of cardboard, comprising at least a first and a second planar section (14a, 14b), which are pivotably connected to each other by a set-up fold (16), characterized by - a first and a second planar cover body (18a, 18b) made of cardboard, an inner surface of the first cover body (18a) resting on an inner surface of the first planar section (14a) and being partially glued thereto and an inner surface of the second cover body (18b) resting on an inner surface of the second planar section (14b) and being partially glued thereto, - wherein a first adhesive-free pocket region (22a) is formed between the inner side of the first cover body (18a) and the inner side of the first planar section (14a), which is adjacent to the set-up fold (16), and a second adhesive-free pocket region (22b) is formed between the inner side of the second cover body (18b) and the inner side of the second planar section (14b), which is adjacent to the set-up fold (16), - and wherein a flat metal strip (20) bridging the set-up fold (16) is arranged with a first part in the first pocket region (22a) and with a second part in the second pocket region (22b), wherein the metal strip (20) is held displaceably in at least one of the pocket regions (22a, 22b) without material connection to the respective cover body (18a, 18b) and planar section (14a, 14b).

2. The display stand according to claim 1, wherein - the metal strip (20) is held displaceably in both pocket regions (22a, 22b) between the base body (12) and the cover bodies (18a, 18b) without material connection.

3. A display stand according to any one of the preceding claims, wherein - the inner surface of the first cover body (18a) is glued to the inner surface of the first planar section (14a) in a first adhesive region (24a), - wherein the first adhesive region (24a) surrounds the first pocket region (22a) on three sides.

4. A display stand according to any one of the preceding claims, wherein - the first and / or second cover body (18a, 18b) is formed in one piece throughout with the base body (12) and is pivotably connected to the first and / or second section (14a, 14b) of the base body (12) by an end fold (28a, 28b).

5. A display stand according to claim 4, wherein - the end fold (28a, 28b) runs parallel to the set-up fold (16).

6. A display stand according to any one of the preceding claims, wherein - the first and second cover bodies (18a, 18b) are arranged at a distance (26) from one another along the set-up fold (16).

7. A display stand according to any one of the preceding claims, wherein - the first and / or second section (14a, 14b) has a length (B1) measured at right angles to the set-up fold (16), - and the first and / or second cover body (18a, 18b) has a length (B2) measured at right angles to the set-up fold (16), - wherein the length (B1) of the first and / or second section (14a, 14b) is greater than the length (B2) of the first and / or second cover body (18a, 18b).

8. A display stand according to claim 7, wherein - the length (B1) of the first and / or second section (14a, 14b) is greater than the length (B2) of the first and / or second cover body (18a, 18b) by an amount of 0.2 - 2 mm.

9. A display stand according to any one of the preceding claims, wherein - the first and / or second pocket region (22a, 22b) has a length, measured at right angles to the set-up fold (16), which is less than 80% of a length of the first and / or second section (14a, 14b), measured at right angles to the set-up fold (16).

10. A display stand according to any one of the preceding claims, wherein - a slot (30) is provided on the first and / or second planar section (14a, 14b) and / or on the first or second planar cover body (18a, 18b), which slot allows the metal strip (20) to be inserted into the first and / or second pocket region (22a, 22b).

11. Method for setting up a display stand (10), in which - a display stand (10) according to one of the preceding claims, starting from a planar arrangement in which the first and second sections (14a, 14b) are arranged in alignment with one another, is brought into an angular arrangement by pivoting the first and second sections (14a, 14b) relative to one another about the set-up fold (16), in which the first and second sections (14a, 14b) are arranged at a set-up angle (a) relative to one another - wherein the metal strip (20) plastically deforms during pivoting and, in the angular arrangement, the metal strip (20) holds the first and second sections (14a, 14b) at the set-up angle (a) relative to one another.

12. A method for manufacturing a set up a display stand (10) according to any one of claims 1 - 10, wherein - the planar base body (12) made of cardboard with the first and a second planar section (14a, 14b) and the set-up fold (16) connecting them pivotably to one another is provided, - the inner surfaces of the first and second planar cover bodies (18a, 18b) made of cardboard are applied to the first and second planar sections (14a, 14b) and partially glued thereto, wherein a first adhesive-free pocket region (22a) is formed between the inner surface of the first cover body (18a) and the inner surface of the first planar section (14a) which pocket region (22a) is adjacent to the set-up fold (16), and a second adhesive-free pocket region (22b) is formed between the inner side of the second cover body (18b) and the inner side of the second planar section (14b), which pocket region (22b) is adjacent to the set-up fold (16), - and wherein the flat metal strip (20) is arranged bridging the set-up fold (16) with a first part in the first pocket region (22a) and with a second part in the second pocket region (22b), wherein the metal strip (20) is held displaceably in at least one of the pocket regions (22a, 22b) without material connection to the respective cover body (18a, 18b) and planar section (14a, 14b).

13. The method according to claim 12, wherein - the flat metal strip (20) is already arranged in the pocket regions (22a, 22b) when they are formed.

14. The method according to claim 12, wherein - the flat metal strip (20) is inserted into the pocket regions (22a, 22b) through a slot (30) after they have been formed.

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