Packaging blank for a packaging base as well as packaging base

Abstract

Packaging blank (1) for a tray-shaped packaging base (100), comprising a flat blank (2), in particular paper fiber-based, with a bottom area (3) and at least four side wall areas (4a-4d) bounding the bottom area (3), which are foldable along bottom fold lines (F1-F4) relative to the bottom area (3), wherein each side wall area (4a-4d) has a free edge area (5a-5d), which are each foldable along an edge fold line (F5-F8) relative to the associated side wall area (4a-4d), wherein, in each case extending from two adjacent side wall areas (4a-4d) and / or their associated edge areas (5a-5d), cutout areas (6a-6h) of the blank (2), in particular L-shaped, forming a corner frame (7a-7d) and connecting the respective corner frame (7a-7d) with the The floor area (3) connecting the corner wall (8) is removed.

Description

The invention relates to a packaging blank for a bowl-shaped packaging base according to the features in the preamble of claim 1, a packaging base comprising such a packaging blank, and a packaging with such a packaging base. Recently, numerous initiatives have emerged to reduce the amount of plastic in or on packaging, particularly food packaging, and to increase the recyclability of the materials used. Currently, plastic trays are primarily used as bases for packaging food. These trays are typically made of polypropylene (PP), polyethylene (PE), or other initially shapeless materials. Naturally, packaging for fresh food has a relatively short lifespan. From a recycling perspective, such food packaging is generally problematic because it is very difficult to separate the materials by type. Many of the packaging materials used are dyed or contaminated, making their recycling generally no longer economically viable. These plastic trays are typically shaped using a thermoforming process. Their open-sided design allows them to be sealed with a foil seal after being filled with food and optionally infused with a protective gas tailored to the specific food product. This foil seal can consist of one or more layers, such as an ethylene-vinyl alcohol copolymer (EVOH). Due to material limitations, current packaging trays are mostly unprinted, with the necessary product information applied as an adhesive label to the foil seal or the underside of the tray base. Separating the adhesive label from the foil is extremely difficult. Part of this problem could be solved by using a cardboard base for the packaging, which is much easier to print on.The necessary tightness is achieved by a layer of foil subsequently inserted into the bottom of the packaging. German patent DE 10 2020 129 037 A1 describes a food packaging with a tray-shaped base. This base is made of paper fibers and is therefore a cardboard or corrugated board tray. A film, subsequently inserted into the base and permanently but detachably bonded to it, forms the first part of a foil bag, which is completed by a top film. The base has a circumferential rim along which the bottom film is bonded to the top film. German patent DE 10 2020 129 730 A1 discloses a food packaging whose base has a paper fiber-based blank, which is folded to form a tray shape. A film is then blown into the tray using compressed air and bonded to its base and side walls. From EP 2 441 697 A1, a packaging is known whose packaging base has a paper fiber-based blank, the folding of which forms a tray shape. Subsequently, a heated film is pressed against the bottom and side walls of the packaging base using low pressure and bonded to its tray space. EP 3 693 284 A1 describes a packaging whose base has a paper fiber-based blank, which is folded to form a tray shape. A film is then thermoformed into the tray and bonded to its base and side walls. WO 2020 / 033352 A1 describes food packaging whose base consists of a tray-shaped insert made of plastic or a paper-fiber-based material such as cardboard or corrugated board. A microwave-sensitive material, enclosing a film, may be incorporated into the tray-shaped base. DE 198 40 205 A1 discloses a packaging whose base, made of a fibrous material, has a tray shape produced by compression molding. An insert made of at least one plastic film, previously produced by deep drawing and corresponding to the tray space, is inserted into the base, and its circumferential flange is connected to a circumferential rim of the base. The processes known for paper-fiber-based packaging bases involve inserting the film layer into the packaging blank, which has already been formed into a packaging base. To adapt to the respective internal contour, the film layer is stretched considerably in some areas, thus reducing its wall thickness. To still ensure a sufficiently thick wall, thicker film layers are used overall, with a thickness of approximately 100 micrometers (µm), depending on the depth of the packaging base. Due to the film stretching, the depth of the packaging bases is therefore usually limited to a maximum of 60 millimeters (mm). Regardless, several process steps are necessary to insert the film layer. This limits the total number of packaging bases that can be produced per unit of time, resulting in correspondingly high production costs. Despite the significantly simpler and better recyclability of such packaging bases, they have therefore not been able to prevail over the inherently problematic plastic trays. The present invention therefore aims to further develop a packaging blank and a packaging base produced therefrom in such a way that it can be manufactured economically despite good recyclability. Furthermore, a method for the economical production of an easily recyclable packaging blank and a packaging base based thereon is to be developed. The problem is solved by a packaging blank according to the features of claim 1, a packaging base according to the features of claim 11, and a packaging with the features of claim 14. According to the invention, it is proposed that the packaging blank may have individual cutout areas. These cutout areas are through-openings in which the material of the blank has been removed. Each of these cutout areas is preferably located as an extension of two adjacent side wall areas and / or their associated edge areas, so that a corner frame and a corner wall connecting the respective corner frame to the bottom area are formed. The presence of the cutout areas results in a highly advantageous behavior of the packaging blank during its folding, in particular to securely support and / or seal the lower part of the packaging later along the corner area located between two adjacent side wall areas. According to a preferred embodiment of the basic inventive concept, each of these cutout areas can be at least partially bounded by a portion of its associated corner frame and the corner wall belonging to that corner frame. Advantageously, each corner wall can be enclosed between two cutout areas, so that a portion of each corner frame, together with its associated corner wall and a side wall area immediately adjacent to the corner frame and the corner wall, defines a cutout area. Preferably, the cutout areas can each have an L-shape. Each corner wall can have two wing sections, each of which then extends into one of the, in particular two, cutout areas belonging to the corresponding corner frame or its corner wall. The wing sections are each foldable along a wing fold line opposite the associated corner wall.The arrangement of the corner walls together with their wing sections also achieves advantageous behavior of the packaging blank during its folding, in particular to securely support and / or seal the packaging base later along the corner area located between two adjacent side wall areas. Advantageously, each corner frame can have a corner segment, in particular one with an outer edge that is at least partially curved. Each corner segment can have an outer edge that is at least partially curved. Furthermore, the edge region of the side wall area belonging to a cutout area can each have a projection area adjacent to that cutout area. It is provided that the corner segment of each corner frame is connected by a frame section to each of the two projection areas adjacent to a cutout area. This achieves advantageous behavior of the packaging blank during its folding, in particular to securely support and / or seal the lower part of the packaging later along the corner area located between two adjacent side wall areas.According to a further development based on this, the two frame sections of a corner frame can each be folded along a segment fold line relative to the corresponding corner segment. Furthermore, the two frame sections of a corner frame can then also each be folded along a section fold line relative to the corresponding extension area. This ensures that during the folding of the packaging blank, an upward and subsequent downward movement of the respective corner segment is achieved, which in particular ensures that the portion of the film layer spanning the respective cutout area is advantageously guided throughout the entire folding process. The corner walls can be folded into the desired shape in a particularly advantageous manner between the base area and the corner segment of a corner frame. The corner walls are foldable along a first corner fold line relative to the base area and along a second corner fold line relative to the corresponding corner segment. Within the scope of the invention, it is considered advantageous if the wing fold line of a wing section of a corner wall and the bottom fold line of the associated side wall area form an angle greater than 90° between them. In this way, the side wall areas, in combination with the corner walls, do not run perpendicular to the bottom area when the packaging blank is folded, but rather at an angle. In other words, the opening width of the packaging base that can be folded from the packaging blank increases from the bottom area towards the edge of the side wall areas, thus reliably preventing any goods arranged in the tray-shaped packaging base from becoming jammed. Preferably, the first corner fold line of a corner wall and at least one of the adjacent bottom fold lines can form an angle greater than 90° between them. The combination of, in particular, a total of four, side wall areas and corner walls thus enables the formation of an octagonal tray space for a packaging base that can be manufactured from it. According to the invention, the wing sections of at least one corner wall, preferably each corner wall, can each have at least two edges that at least partially define the associated cutout area, wherein the edges of the two wing sections of a corner wall facing a corner segment of a corner frame can each form an angle of between 90° and 180° between them. Preferably, said angle can be between 145° and 175° or between 150° and 170°. This advantageously ensures, in the erected state of the side wall areas and the corner walls of the packaging blank, that the wing sections of the corner wall only project to the plane of the edge fold lines and thus do not extend beyond the edge areas angled relative to the side wall areas. In principle, the cut-out must have at least one feature that is at least partially attributable to at least one embossing, creasing, perforation, or scoring. For example, the cut-out may have an embossed area that serves an aesthetic purpose and / or forms a reservoir for liquid accumulation. Alternatively or additionally, at least one of the fold lines may be at least partially formed by at least one feature resulting from embossing, creasing, perforation, or scoring. Thus, at least some of the fold lines may be pre-embossed. Grooves can be used to create so-called channel grooves, which weaken the material fibers of the underlying sheet material to selectively reduce bending resistance.Preferably, a cut piece of particularly thick material can be grooved and / or creased to obtain a sharp crease edge, so that the material cannot break uncontrollably along the fold line thus formed. According to a particularly preferred embodiment of the basic inventive concept, at least one top side of the flat blank packaging material can be laminated with at least one layer of film. In other words, the film layer is not subsequently inserted into the packaging base, which has already been formed, particularly by folding, but rather applied to the unfolded packaging material. The resulting advantage lies primarily in the fact that the film layer no longer needs to undergo significant stretching, which can otherwise drastically reduce its thickness. This allows for the use of a thinner film layer, which in turn lowers the material costs for the packaging material. The material for the film web can be, for example, polypropylene (PP), polyethylene (PE), or polyethylene terephthalate (PET). Multilayer composite films can also be used, their barrier properties further enhanced by special layers such as those made of ethylene-vinyl alcohol copolymer (EVOH). The packaging blank presented here, according to the invention, exhibits excellent recyclability and is extremely economical to manufacture. In particular, the application of the film layer, preferably before folding, eliminates the need for the otherwise common and complex processes of subsequent film application. Furthermore, the preferred use of a paper fiber-based material allows for easy printing and / or labeling, thus also eliminating the need for stickers. In contrast to known plastic trays, the packaging blank according to the invention offers improved printability, as, for example, readily printable cardboard can be used as the starting material, resulting in significant advantages in product design.In particular, company logos, product information, ingredient lists, preparation instructions, product barcodes, and much more can be applied to the cover of the tray-like packaging base, which is subsequently formed from the sheet material, alongside an attractive product presentation using advertising copy and graphics. As a result, the proportion of plastic is reduced to a minimum, while the intended material mix enables a very high degree of easy recyclability of the materials used. In any case, the packaging blank according to the invention can be produced within a very short time and with minimal effort. The invention further relates to a packaging base comprising a packaging blank according to the invention as described above. The side wall regions of the packaging blank are folded along a bottom fold line relative to the bottom region of the blank. Furthermore, its corner walls are also folded along a first corner fold line relative to the bottom region of the blank, so that preferably an overall tray shape with a tray compartment is formed. In particular, the two wing sections of each corner wall are folded along their respective wing fold lines relative to the corresponding side wall regions such that the wing sections of each corner wall are located in front of an inner surface of an adjacent side wall region facing a tray compartment of the packaging base.Preferably, at least one of the wing sections can have at least partial contact with the inside of the side wall area immediately adjacent to it. Preferably, both the edge areas, which are brought close to the corner frame by the erection of the side wall sections and folded along their edge fold line relative to the associated side wall section, and the corner segments, which are brought close to the edge areas by the erection of the corner walls and folded along their second corner fold line relative to the associated corner wall, can together form at least a partial circumferential sealing edge. Building on this, it is considered particularly advantageous if one layer of film, in particular the film layer, is connected, especially welded, to each other in the areas of approach between an edge area and a corner segment. The resulting advantage has already been explained in more detail in connection with the packaging blank according to the invention, so that, to avoid repetition, reference is made here to the corresponding explanations. Preferably, at least one of the corner segments and / or at least one of the extensions of the blank can be at least partially removed. Some material may remain and protrude, thus forming an opening aid for the subsequent packaging. In this way, easy separation of a food item placed in the packaging base is possible by grasping the opening aid and thus easily separating the food item, contained in a "film bag" formed by the film layer and an associated sealing film, from the paper fiber-based part of the packaging base, particularly to ensure easy waste separation. Furthermore, the invention relates to packaging, in particular food packaging, with a packaging base as described above. Here, the film layer of the packaging base is at least partially connected, in particular welded, to a sealing film along its edges and at least part of the corner segments. The resulting advantage has already been explained in more detail in connection with the packaging blank and / or the packaging base according to the invention, so that, to avoid repetition, reference is made here to the corresponding explanations. A method for producing a packaging blank for a packaging base, wherein the packaging blank can advantageously be the packaging blank according to the invention, could be carried out in the following steps: - Providing a continuous or finite sheet material, in particular paper fiber-based; - Introducing fold lines into the sheet material; - Removing cutout areas from the sheet material before, preferably during or after the introduction of the fold lines; - At least partially laminating at least one cover side of the sheet material with at least one film layer, in particular incorporating a separating layer previously applied at least partially to the cover side of the sheet material, before, during or preferably after the removal of the cutout areas and / or the introduction of the fold lines;- Cutting out at least one section from the laminated surface material before, during or preferably after removing the cutout areas and / or adding the fold lines. According to a preferred further development of the method, the surface material can be printed or / and labelled, preferably before it is laminated with at least one layer of film, at least in certain areas. Ultimately, the invention is also directed to a method for producing a packaging base from a packaging blank. The packaging blank can be the packaging blank according to the invention or the packaging blank that can be produced by the method according to the invention. In any case, the method comprises the following steps, wherein at least two or preferably all of these steps can be carried out simultaneously: - Erecting the side wall areas by folding them relative to the bottom area along the bottom fold lines, and erecting the corner walls by folding them relative to the bottom area along their first corner fold lines, forming a tray space;- Folding the edge areas along the edge fold lines opposite the associated side wall areas, preferably before, during, or after the erection of the side wall areas, and folding the corner segments along their second corner fold lines opposite the associated corner wall, preferably before, during, or after the erection of the corner walls; - Folding the wing sections along their wing fold lines opposite the respective associated corner wall in the direction of the shell space, in particular before or during the erection of the side wall areas and / or the corner walls; - Folding the corner frames along the section fold lines and segment fold lines, in particular during the erection of the side wall areas and / or the corner walls, such that the frame sections of each corner segment are at least partially integrated between it and the associated outrigger areas;- Joining, preferably welding, film flaps formed from the film layer in the cutout areas, particularly during the folding of the corner frames and / or the erection of the side wall areas and / or the corner walls; - at least partially separating overhangs of the packaging blank formed from the corner frames and / or the extension areas, particularly leaving at least one opening flap, before, during or after joining the film flaps. The invention is explained in more detail below with reference to a schematically illustrated embodiment. The figures show: Fig. 1 - a packaging blank according to the invention in a top view, Fig. 2 - a sheet material for producing the packaging blank from Fig. 1 in a top view, Fig. 3 - the sheet material from Fig. 2 after a first production step in the same manner, Fig. 4 - the sheet material from Fig. 2 after a second production step in the same manner, Fig. 5 - the sheet material from Fig. 2 during a third production step in the same manner, and Fig. 6 - a packaging base according to the invention, produced from the packaging blank, preferably from Fig. 1, produced using the method indicated in Figs. 2-5, in a perspective view. Fig. 1 shows a top view of a packaging blank 1 according to the invention. The packaging blank 1 serves as the basis for a packaging base 100, in particular a bowl-shaped one, which can be produced by folding it, as can be seen in Fig. 6. The packaging blank 1 comprises a preferably paper-fiber-based flat blank 2, which has a bottom region 3 and at least four side wall regions 4a-4d bounding the bottom region 3. Each side wall region 4a-4d is delimited from the bottom region 3 by a bottom fold line F1-F4, along which the respective side wall region 4a-4d can be folded relative to the bottom region 3. Each side wall region 4a-4d has a free edge region 5a-5d. The edge areas 5a-5d are each delimited from the associated side wall area 4a-4d by an edge fold line F5-F8, so that each edge area 5a-5d is foldable along an edge fold line F5-F8 relative to the associated side wall area 4a-4d.As indicated by the black triangular areas, two cutout areas 6a-6h of the blank 2 are located in extensions of two adjacent side wall areas 4a-4d and their associated edge areas 5a-5d. In these cutout areas, the material of the blank 2 is missing, and corresponding openings are present. By removing the material within the cutout areas 6a-6h, a corner frame 7a-7d is formed in each case. Between each pair of cutout areas 6a, 6b; 6c, 6d; 6e, 6f; 6g, 6h, a corner wall (8) is located, which connects the associated corner frame 7a-7d to the base area 3. As can be seen, the blank 2 of the packaging blank 1, which extends in a longitudinal direction X and a transverse direction Y, is symmetrically designed, such that it is mirrored along both the longitudinal direction X and the transverse direction Y. The longitudinal direction X and the transverse direction Y divide the blank 2 into four congruent mirror sections, so that, for the sake of clarity, not all parts of the blank 2 are labeled with reference symbols. Consequently, the reference symbols located in one mirror section and assigned to the parts of the blank 2 therein also apply analogously to the other mirror sections. Each cutout area 6a-6h is bounded by a portion of its associated corner frame 7a-7d and a corner wall 8 belonging to that corner frame 7a-7d. The corner walls 8 are foldable along a first corner fold line F9 relative to the base area 3 and along a second corner fold line F10 relative to the associated corner segment 9. Furthermore, each corner wall 8 has two wing sections 8a, 8b facing away from each other and extending into one of the cutout areas 6a-6h, each of which is foldable along a wing fold line F11, F12 relative to the associated corner wall 8. Each wing section 8a, 8b has two angled edges K1, K2 and K3, K4, which bound a portion of the associated cutout area 6a-6h. As a result, the cutout areas 6a-6h each have an essentially L-shaped configuration.Each corner frame 7a-7d has a corner segment 9, each of which has an outer edge A1-A4 that is at least partially curved. Each edge region 5a-5d of a side wall region 4a-4d belonging to a cutout region 6a-6h has a projection region 10a, 10b adjoining this cutout region 6a-6h. The corner segment 9 of each corner frame 7a-7d is connected by a frame section 11a, 11b to each of the two projection regions 10a, 10b adjoining a cutout region 6a-6h. The two frame sections 11a, 11b of a corner frame 7a-7d are each foldable along a segment fold line F13, F14 relative to the corresponding corner segment 9. At the same time, the two frame sections 11a, 11b of a corner frame 7a-7d are also foldable along a section folding line F15, F16 in relation to the corresponding outrigger area 10a, 10b. The corner walls 8 each extend between the base area 3 and the corner segment 9 of a corner frame 7a-7d, wherein the first corner fold line F9 of a corner wall 8 and at least one of the base fold lines F1-F4 adjacent to it form an angle W1, W2 of greater than 90° between them. The edges K2, K4 of the two wing sections 8a, 8b of a corner wall 8 facing a corner segment 9 of a corner frame 7a-7d each form an angle W3 between 90° and 180° between them. Preferably, the value of the angle W3 can be between 145° and 175° or between 150° and 170°. The edge of a side wall area 4a-4d facing a cutout area 6a-6h and at least partially limiting it, each encloses an angle W4 of greater than 90° between itself and a floor fold line F1-F4 adjacent to this edge. In a manner that is not readily apparent, a cover side D of the flat cutout 2 is laminated with at least one layer of foil L. Figures 2, 3, 4 to 5 show individual steps of the inventive method for producing the packaging blank 1; in detail: Figure 2 shows a top view of a prepared flat sheet material M. The sheet material M is preferably paper fiber-based. The sheet material M can be a portion of a continuous material, for example, a roll, or a section that has already been cut and is therefore finite. The material of the sheet material M can be, for example, corrugated cardboard, corrugated cardboard laminated with solid cardboard, or solid cardboard. All usable cardboard types can be made from recycled material, virgin fiber cardboard, or virgin fiber cardboard with a recycled content. Of course, other materials are also possible. Figure 3 shows an optional process step in which at least one area of ​​the base material M is provided with a print P and / or lettering. Any conventional printing process can be used for this, such as gravure, screen, or offset printing. Due to process requirements, printing on corrugated board laminated with solid cardboard is preferably carried out before the lamination of the base material M. The application of a print P and / or lettering is, of course, possible on both sides. In this example, a pattern consisting of four prints P is applied three times, so that ultimately – again, purely by way of example – a total of three blanks 2 can be taken from the base material M. Fig. 4 shows the sheet material M from Fig. 2, into which – purely by way of example, after the application of the prints P – the fold lines F1-F16 are introduced. In Fig. 4, these are indicated by dashed lines without reference numerals. The introduction of the fold lines F1-F16 can be achieved, for example, by die-cutting, creasing, perforating, embossing, and, if necessary, scoring the sheet material M. Naturally, an area of ​​the sheet material M can also be embossed, for example, to achieve a design feature and / or a specific function of the area thus transformed. Preferably, a method known in the packaging industry is used for this purpose. In the packaging industry, standard flatbed die-cutting machines are preferably employed for this. In any case, the cutout areas 6a-6h are removed from the sheet material M in this process.This can preferably be done by punching, so that openings are created within the surface material M at these points. Figure 5 shows the process step of at least partially laminating a cover surface D of the surface material M with at least one film layer L. Here, the film layer L is represented by a roll of material. A conventional sheet or web lamination process can be used to achieve a barrier function for the surface material M. This could involve, for example, wet lamination, dry lamination, wax lamination, or solvent-free lamination. Prior to this, a release layer, such as varnish, can be applied to at least one area of ​​the surface material M to facilitate the subsequent removal of the film layer L from the surface material M. Fig. 6 shows a packaging base 100 made from a packaging blank 1. Referring to Fig. 5, and purely by way of example and not shown in detail, a total of three blanks 2, each for one packaging blank 1, were cut from the sheet material M laminated with the film layer L. Depending on the design of the packaging blank 1, the cutting can be carried out, particularly with straight cuts, using guillotine cutters or by die-cutting on a flatbed die-cutter. As can be seen, the side wall sections 4a-4d of the packaging blank 1 are now folded along a bottom fold line F1-F4 and positioned opposite the bottom section 3 of the blank 2. Similarly, its corner walls 8 are also folded along a first corner fold line F9 and positioned opposite the bottom section 3 of the blank 2. The side wall sections 4a-4d and the corner walls 8 were positioned to form a shell space R extending in a vertical direction Z. Furthermore, both wing sections 8a, 8b of each corner wall 8 are folded along their wing fold lines F11, F12 opposite their corresponding corner wall 8. This places the wing sections 8a, 8b of each corner wall 8 in front of an inner surface facing the shell space R of an immediately adjacent side wall section 4a-4d. In this case, at least one wing section 8a, 8b can have at least partial contact with the side wall area 4a-4d.Furthermore, by erecting the side wall sections 4a-4d, the edge sections 5a-5d, each folded along their edge fold line F5-F8 relative to the corresponding side wall section 4a-4d, are brought close to the corner frames 7a-7d. By erecting the corner walls 8, the corner segments 9, each folded along their second corner fold line F10 relative to the corresponding corner wall 8, are also brought close to the edge sections 5a-5d. The edge sections 5a-5d and the corner segments 9 thus form, at least partially, a circumferential sealing edge 12. The film layer L is connected, in particular welded, to each other in the areas of approximation between an edge section 5a-5d and a corner segment 9. To obtain the shape of the packaging base 100, a packaging blank 1 was erected in a device (not shown in detail) and fixed to the film layer L at the sealing edge 12 by sealing or another plastic bonding method. These processes take place in the following steps: First, the blank 2 is separated from a magazine (not shown here) and fed via conveyor belts or another transport device to a pre-breaking station (also not shown). In the pre-breaking station, all cardboard segments, including all sub-segments (4, 5, 8, 9, and 11), are angled relative to each other at the fold lines with respect to the base surface 3 or the adjacent cardboard segments. The ideal angle between the segments is between 150° and 170°. Pre-crimping weakens the material fibers at the fold lines, allowing the blank to automatically fold into the desired shape during the subsequent erection process. The blank 2 is then positioned over a folding device (not shown). Next, the erection process of the tray-shaped packaging base 100 is initiated. Here, an upper die presses the blank into a sub-mold. A vertical movement then moves the base 3 into its final position. Simultaneously, the folding of the wing segments (8a, 8b) and the corner frames (7a-7d) is assisted by folding fingers (not shown).The folding fingers assist in folding the respective wing sections 8a, 8b of each corner wall 8; thus, during the folding movement, these can be pressed upwards, for example, with fingers (not shown in detail), so that the wing sections 8a, 8b are always located in front of the inner surfaces of the side wall sections 4a-4d facing the shell space R as soon as the wing sections 8a, 8b and the side wall sections 4a-4d are positioned one above the other during the erection of the side wall sections 4a-4d and the corner walls 8, in particular when they slide into place. Furthermore, the folding fingers assist in folding the blank 2 along the segment fold lines F13, F14, F15, F16 and the section fold lines F10 on the individual corner frames 7a-7d (also not shown here).After the blank 2 has been brought into position by the vertical movements, the film layer L is welded along the sealing edge 12, so that the blank 2, which is already largely folded, can ultimately be fixed in its final form as the packaging base 100. For this purpose, eight welding elements, arranged diagonally above the folded blank 2 and not shown in detail here, descend over the already pre-folded corner segments 9 to close the film loops and weld them to the sealing edge 5a, 5d. The welding can be carried out by heat sealing, ultrasonic welding, or another conventional welding process. For further stabilization, it is also possible to connect the wing sections to the side walls 4a, 4d by ultrasonic welding. The welding fixes the film layer L in its final position. In the last step, the individual corner segments 9, together with the cantilever sections 10a, 10b and the frame sections 11a, 11b, are at least partially separated and removed by a punching operation, preferably along a separation line 101 indicated in Fig. 1 by thin broken lines in the area of ​​the corner frame 7a.This can be done in a further processing station or directly in the folding unit. Standard die-cutting techniques used in the packaging industry are employed. The die-cutting can be performed in such a way as to create opening aids, for example in the form of opening tabs, which allow the film layer L to be easily separated from the base material M, such as cardboard, during later disposal, enabling separate recycling of both materials. The finished packaging bases 100 can then be fed directly into the food filling process or, for example, stacked and made available for a later packaging process. Reference symbol list: 1 Packaging blank 2 Cut from 1 3 Bottom area of ​​2 4a Side wall area of ​​2 4b Side wall area of ​​2 4c Side wall area of ​​2 4d Side wall area of ​​2 5a Edge area of ​​2 at 4a 5b Edge area of ​​2 at 4b 5c Edge area of ​​2 at 4c 5d Edge area of ​​2 at 4d 6a Cutout area of ​​2 6b Cutout area of ​​2 6c Cutout area of ​​2 6d Cutout area of ​​2 6e Cutout area of ​​2 6f Cutout area of ​​2 6g Cutout area of ​​2 6h Cutout area of ​​2 7a Corner frame of 2 7b Corner frame of 2 7c Corner frame of 2 7d Corner frame of 2 8 Corner wall of 2 8a Sash section of 8 8b Sash section of 8 9 Corner segment from 7a to 7d 10a Outrigger area at 5c and 5d 10b Outrigger area at 5a and 5b 11a Frame section from 7a to 7d 11b Frame section from 7a to 7d 12 Seal edge from 5a to 5d 100 Packaging base 101 Dividing line A1 Outer edge of 9 A2 Outer edge of 9 A3 Outer edge of 9 A4 Outer edge of 9 D Cover side of 2 F1 Bottom fold line of 2 F2Bottom fold line of 2 F3 Bottom fold line of 2 F4 Bottom fold line of 2 F5 Edge fold line of 2 F6 Edge fold line of 2 F7 Edge fold line of 2 F8 Edge fold line of 2 F9 Corner fold line between 3 and 8 F10 Corner fold line between 8 and 9 F11 Wing fold line of 8b F12 Wing fold line of 8a F13 Segment fold line from 7a to 7d F14 Segment fold line from 7a to 7d F15 Section fold line from 7a to 7d F16 Section fold line from 7a to 7d K1 Edge of 8a K2 Edge of 8a K3 Edge of 8b K4 Edge of 8b L Film layer of 1 M Surface material P Print or lettering R Shell space of 100 W1 Angle W2 Angle W3 Angle W4 Angle X - Longitudinal direction of 2 Y Transverse direction of 2 Z Vertical direction of 100 QUOTES INCLUDED IN THE DESCRIPTION This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature DE 10 2020 129 037 A1

[0004] DE 10 2020 129 730 A1

[0005] EP 2 441 697 A1

[0006] EP 3 693 284 A1

[0007] WO 2020 / 033352 A1

[0008] DE 198 40 205 A1

[0009]

Claims

Packaging blank (1) for a tray-shaped packaging base (100), comprising a flat blank (2), in particular paper fiber-based, with a bottom area (3) and at least four side wall areas (4a-4d) bounding the bottom area (3), which are foldable along bottom fold lines (F1-F4) relative to the bottom area (3), wherein each side wall area (4a-4d) has a free edge area (5a-5d), which are each foldable along an edge fold line (F5-F8) relative to the associated side wall area (4a-4d), wherein, in each case extending from two adjacent side wall areas (4a-4d) and / or their associated edge areas (5a-5d), cutout areas (6a-6h) of the blank (2), in particular L-shaped, forming a corner frame (7a-7d) and connecting the respective corner frame (7a-7d) with the The floor area (3) connecting the corner wall (8) is removed. Packaging blank (1) according to claim 1, characterized in that each cutout area (6a-6h) is at least partially limited by a part of the corner frame (7a-7d) belonging to it and the corner wall (8) belonging to this corner frame (7a-7d), wherein each corner wall (8) has two wing sections (8a, 8b) which each extend into one of the, in particular two, cutout areas (6a-6h) belonging to a corner frame (7a-7d) and are foldable along a wing fold line (F12, F12) relative to the associated corner wall (8). Packaging blank (1) according to claim 1 or 2, characterized in that each corner frame (7a-7d) has a corner segment (9) having, in particular, an outer edge (A1-A4) that is curved at least in sections, and the edge region (5a-5d) of the side wall region (4a-4d) belonging to a cutout region (6a-6h) has a projection region (10a, 10b) adjoining this cutout region (6a-6d), wherein the corner segment (9) of each corner frame (7a-7d) is connected by a frame section (11a, 11b) to each of the two projection regions (10a, 10b) adjoining each cutout region (6a-6h). Packaging blank (1) according to claim 3, characterized in that the two frame sections (11a, 11b) of a corner frame (7a-7d) are each foldable along a segment fold line (F13, F14) relative to the associated corner segment (9) as well as foldable along a section fold line (F15, F16) relative to the associated extension area (10a, 10b). Packaging blank (1) according to claim 3 or 4, characterized in that the corner walls (8) each extend between the bottom area (3) and the corner segment (9) of a corner frame (7a-7d), wherein the corner walls (8) are each foldable along a first corner fold line (F9) relative to the bottom area (3) and along a second corner fold line (F10) relative to the associated corner segment (9). Packaging blank (1) according to claim 5, characterized in that the first corner fold line (F9) of a corner wall (8) and at least one of the bottom fold lines (F1-F4) adjacent to it enclose an angle (W1, W2) of greater than 90° between them. Packaging blank (1) according to one of claims 2 to 6, characterized in that the wing sections (8a, 8b) of each corner wall (8) each have at least two edges (K1, K2; K3, K4) that at least partially define the associated cutout area (6a-6h), wherein the edges (K2, K4) of the two wing sections (8a, 8b) of a corner wall (8) facing a corner segment (9) of a corner frame (7a-7d) each enclose an angle (W3) between 90° and 180°, preferably between 145° and 175° or between 150° and 170°. Packaging blank (1) according to one of the preceding claims 3 to 7, characterized in that the blank (2) has at least one feature formed at least partially in at least one of the following ways and / or at least one of the fold lines (F1-F16) is formed at least partially in at least one of the following ways: - embossing; - creasing; - perforation; - scoring. Packaging blank (1) according to one of the preceding claims, characterized in that at least one cover side (D) of the, in particular unfolded, flat blank (2) is laminated with at least one film layer (L). Packaging base (100) comprising a packaging blank (1) according to one of the preceding claims, the side wall regions (4a-4d) of which are folded along a bottom fold line (F1-F4) and the corner walls (8) of which are folded along a first corner fold line (F9) opposite the bottom region (3) of the blank (2), in particular forming a tray space (R), wherein, in particular, the two wing sections (8a, 8b) of each corner wall (8) are folded along a wing fold line (F11, F12) opposite it such that the wing sections (8a, 8b) are each located in front of an inner side of an adjacent side wall region (4a-4d) facing a tray space (R) of the packaging base (100), in particular having at least partial contact with it. Packaging base (100) according to claim 10, characterized in that both the edge areas (5a-5d) which are brought close to the corner frame (7a-7d) by the erection of the side wall areas (4a-4d) and are each folded along their edge fold line (F5-F8) relative to the associated side wall area (4a-4d), and the corner segments (9) which are brought close to the edge areas (5a-5d) by the erection of the corner walls (8) and are each folded along their second corner fold line (F10) relative to the associated corner wall (8) together form at least partially a circumferential sealing edge (12), wherein one, in particular the, film layer (L) is connected to each other, in particular welded, in the approximation areas between an edge area (5a-5d) and a corner segment (9). Packaging base (100) according to claim 10 or 11, characterized in that at least one of the corner segments (9) and / or at least one of the extensions (10a, 10b) of the blank (2) is / are at least partially removed. Packaging, in particular food packaging, with a packaging base (100) according to one of claims 10 to 12, wherein the film layer (L) of the packaging base (100) is at least partially connected, in particular welded, with a sealing film along its edge regions (5a-5d) and at least a part of the corner segments (9).

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