EP3962825B1 - Packaging container comprising an outer cardboard structure and an insert made of plastic film - Google Patents

Description

The present invention relates to a packaging tray with an outer cardboard structure in which an insert made of film is provided. Furthermore, the present invention relates to a packaging machine and a method for producing a packaging tray with an outer cardboard structure and an insert made of film.

The generic packaging tray is, for example, from the FR2933329 , the FR2826938 , the FR2883223 , the EP2097177A2 , the FR2610595 , the DE19602829 and the WO2018202805A1 and the DE19602829A1 However, the packaging trays described there are comparatively difficult to produce and have disadvantages, particularly when it comes to recycling.

It was therefore the object of the present invention to provide a packaging tray which does not have the disadvantages of the prior art.

The object is achieved with a packaging tray with an outer cardboard structure in which an insert made of film, in particular plastic film, is provided, wherein the cardboard structure is a corrugated cardboard and the structure and the film, in particular plastic film, are locally materially connected to one another in a connecting region, wherein the structure is at least locally deformed in the connecting region.

The present invention relates to a packaging tray with an outer cardboard structure. The cardboard from which the structure is made can be a single-layer or multi-layer cardboard material. The cardboard material preferably comprises cellulose, groundwood and/or waste paper. The structure, in particular the cardboard, can contain air pockets. For example, the structure, in particular the cardboard, is in the form of a corrugated structure, in particular corrugated cardboard. On its inside, the structure, in particular the cardboard material, can have a coating that makes it more resistant to liquid influences and/or water vapor. This layer is particularly preferably sealable. This cardboard structure is preferably produced by folding and optionally subsequent material bonding, for example gluing a cardboard web or a cardboard blank. After folding, the cardboard structure can also be fixed in its folded structure by form and/or force locking. The folded shape of the structure is preferably stabilized in its folded shape by the insert provided according to the invention.

Preferred corrugated cardboard consists of an outer cover, an inner cover, optionally one or more intermediate covers arranged in between and at least one or more waves that space the respective covers apart from one another. In a further embodiment, at least two covers are connected to one another without a wave in between, for example the outer cover with the intermediate cover arranged behind it, for example when the outer cover is a printed web.

Single-wave corrugated cardboard is particularly preferred, which consists of an outer cover, inner cover and a wave, preferably in between. The G-wave type is particularly preferred for the wave, for example according to DIN 55468 or according to the publication "Types of Waves" of the Association of the Corrugated Cardboard Industry e.V. (VDW) as of 2015. The height/thickness of the wave is preferably <0.6 mm, particularly preferably 0.2 - 0.5 mm. The pitch of the wave is preferably ≤ 1.8 mm, particularly preferably 0.6 - 1.6 mm. A total thickness of the corrugated cardboard of ≤ 1.5 mm is preferred, but particularly preferably ≤ 0.8 mm, most preferably ≤ 0.65 mm.

An insert made of a film, in particular a plastic film, is inserted into this structure, in particular a cardboard structure. The film, in particular a plastic film, can be any deep-drawable film known to those skilled in the art in the field of food technology, preferably a plastic film. For example, the film, in particular a plastic film, is a soft or hard film made of PP, PA/PE, PE, PVC, A-PET, paper or a suitable mixture or layers of these components bonded together. The insert preferably has at least one barrier property that, for example, prevents or impedes the penetration of oxygen and/or the escape of moisture. The insert preferably has a sealing layer on its surface facing the structure, for example a PE sealing layer, which forms a bonded connection with the surface of the structure under the influence of heat and/or pressure.

Preferably, the insert is provided as a flat film sheet, which is then formed into the structure by deep drawing. Deep drawing can be carried out using negative pressure and/or positive pressure and/or a stamp.

Preferably, a gas cushion is provided in particular in sections between the structure, in particular the cardboard structure, and the insert. The gas cushion is preferably an air cushion. For example, this gas cushion is created by the insert being shaped differently than the structure, so that there is a gap between the insert and the cardboard structure, in which gas, in particular air, is located. This distance is preferably greater than the usual tolerance, so that it is ensured that the insert and the cardboard do not touch at least in sections, in particular when the insert is deep-drawn and is still heated to such an extent that it preferably shrinks somewhat when cooled, but particularly preferably only a small percentage of the deformation caused by deep-drawing is restored. This percentage is particularly preferably < 10%, particularly preferably < 5%. The distance is preferably more than 0.5 mm, particularly preferably more than 1 mm, particularly preferably more than 2.5 mm. Such gas cushions are particularly advantageous when, for example, foodstuffs are packaged in such a packaging container, which are heated in the packaging container - preferably by microwave exposure; when handling such packaging containers, it is desirable if the transfer of temperature from the heated foodstuff to the outside of the packaging container and from there to the parts of the human skin that come into contact with the packaging container when touching it is not unpleasant or even harmful for the person. Another example of the benefits of such gas cushions is the improved protection of sensitive packaged products.

In particular, if the structure, in particular the cardboard, has many air pockets, for example if the structure, in particular the cardboard, is a corrugated structure, in particular corrugated cardboard, particularly preferably corrugated cardboard with G-flute, a gas cushion provided at least in sections between the structure, in particular the cardboard structure, and the insert can be at least partially dispensed with, for example by providing a, in particular predominantly, loose contact between the structure, in particular the cardboard structure, and the insert, i.e. the insert is at most locally laminated to the structure. Such a loose contact arises, for example, because the insert is shaped more or less the same as the structure, so that there is essentially no or only a small distance between the insert and the cardboard structure. This distance is preferably in the range of the usual tolerance, so that the insert and the cardboard touch each other loosely at least in sections, in particular when the insert is deep-drawn and the shrinkage when the insert cools is hindered, for example by a prolonged and/or intensified deep-drawing process, for example by prolonged exposure to the vacuum or increased overpressure.

According to the invention, the structure and the insert are bonded together in a material-locking manner. This bonding is preferably carried out by sealing. The structure and the insert are preferably bonded together in the upper edge area of the side wall. This bonding is preferably only locally and not around the entire circumference. provided. Preferably, the material bond is implemented as a line or strip, which has a width of 1 - 5 cm, preferably 5 - 20 mm, for example. This strip preferably extends horizontally along the side wall of the structure, particularly preferably not around the entire circumference. In particular, the strip does not extend into the corner areas of the side wall of the structure. In the other overlap areas between the structure and the insert, there is preferably no material bond between the structure and the insert. This means that the insert is stably and permanently connected to the cardboard structure, but the connection can be relatively easily removed again to dispose of the packaging tray.

The pressure during sealing is preferably 0.05 - 0.5 N/mm ² . This pressure is preferably applied by a sealing stamp. The temperature during sealing is preferably 110° - 145 °C. These values apply, for example, to the sealing of an insert consisting of a so-called monofilm, preferably made of PE, or of a multi-layer packaging film, a so-called composite film, preferably with an integrated barrier effect, for example as a result of an EVOH layer integrated into the layer structure of the composite film, whereby the outer layer of the composite film which comes into contact with the structure is designed as a PE sealing layer in order to be sealed, for example, to a structure made of corrugated cardboard or solid cardboard. With these values, the corrugated cardboard is preferably designed as a G-flute.

Preferably, the force required to detach the insert from the structure is a maximum of 10, particularly preferably < 8, particularly preferably < 6 N. The values are preferably determined in accordance with DIN 55409 T2. A ZWICK/ROELL AG Ulm tensile testing machine is preferably used for this purpose. The packaging is arranged at an angle of 45° and the removal speed is, for example, 600 mm/min.

According to the invention, the structure is now deformed in the connection area between the insert and the structure. This deformation can be plastic and/or elastic. The plastic deformation, for example on a structure made of corrugated cardboard, is preferably <80% of the wave height, particularly preferably <40%, but preferably not >1 mm, particularly preferably not >0.3 mm, very particularly preferably not >0.1 mm. These values particularly preferably apply to the G-wave shape.

Preferably, the deformation takes place during sealing. The deformation can, for example, take into account differences in the thickness of the structure. Furthermore, this improves the connection between the insert and the structure. In addition, This makes the force and pressure distribution between the insert and the structure more even. Another advantage is a clearly defined adhesive surface between the structure and the insert.

Packaging trays known from the prior art were characterized by the fact that when separating the insert and the structure, particles or groups of particles that were easily visible to the human eye, for example, came off the cardboard surface and largely remained on the insert, which was not desirable in terms of pure separation for recycling, at least of the insert and cardboard structure. It is quite astonishing that in the packaging tray according to the invention, preferably due to the more even distribution of force or pressure, no or only a small proportion of particles or groups of particles came off the cardboard or insert surface when separating for recycling and/or no or only a small proportion of particles or groups of particles remained on the other surface.

Preferably, the inner surface of the structure, which interacts with the insert, is designed as a smooth and/or closed surface, for example by refining the surface, preferably by satinizing, as is also known from satinized paper, and/or by coating, i.e. the application of a coating compound, for example made of pigments, binders and coating aids with subsequent drying and addressing, and/or by coating, for example with plastics or varnishes, and/or by printing, for example with water-based emulsion varnish using the offset printing process, and/or by laminating, for example by joining with preferably comparatively thin paper, cardboard, plastic or metal foils.

The disclosure made for this subject matter of the present invention applies equally to the other subject matters of the present invention and vice versa. Features of this subject matter of the present application can be adopted in other subject matters of this application and vice versa.

Preferably, the adhering particles cannot be seen with the naked eye. Preferably, the maximum extent of an adhering individual particle or a particle conglomerate is <1 µm - 50 µm, in particular 10 µm to 30 µm. Preferably, the surface area of particles of one component on the other component is <5%, particularly preferably <2%, even more preferably <0.5%, based on the surface area of the material bond between the structure and the insert before their separation. Preferably, the surface area of cardboard particles on the surface of the film is, in particular the plastic film, < 5%, particularly preferably < 2%, even more preferably < 0.5% based on the area of the material bond, here the area of the sealing seam, between the cardboard, in particular the corrugated cardboard, and the plastic film before their separation.

Another subject of the present invention is a packaging machine with which the packaging tray according to the invention with an outer structure, in particular a cardboard structure, in which an insert made of film is provided, is produced, wherein the deep-drawing of the film takes place with negative pressure and/or positive pressure and/or a stamp and the connection of the insert to the structure takes place by means of a stamp.

The disclosure made for this subject matter of the present invention applies equally to the other subject matters of the present invention and vice versa. Features of this subject matter of the present application can be adopted in other subject matters of this application and vice versa.

Preferably, the stamp is heated and/or cooled locally or completely, for example so that the film, which has previously been heated to ensure sufficient formability, does not cool down undesirably during forming and/or areas that tend to thin out significantly, such as the corners/edges of the insert, can be made somewhat cooler in order to at least somewhat limit their deformability and thus avoid excessive reduction in thickness or even tearing during forming.

Preferably, the punch moves between an upper and a lower dead center, wherein the insert is preferably formed during the downward movement and the insert is sealed to the structure during the lower dead center.

Preferably, the side walls of the structure are not vertical, but rather inclined, at least in sections. Preferably, the stamp also has an incline, whereby the angle of the two inclines can be the same or different.

The stamp preferably has a sealing nose with which the insert is sealed to the structure. The sealing nose preferably extends in a plane perpendicular to the direction of movement of the stamp and/or parallel to the upper edge of the structure. The sealing nose can be made of an elastic material, such as rubber. The sealing nose can also be made of the same material as the stamp, preferably made in one piece.

Another object of the present invention is a method for producing the connection between the insert and the structure, wherein the stamp is immersed in the packaging cavity and the connection of the insert with the structure is carried out by locally pressing the stamp against the film and the structure.

The disclosure made for this subject matter of the present invention applies equally to the other subject matters of the present invention and vice versa. Features of this subject matter of the present application can be adopted in other subject matters of this application and vice versa.

Preferably, the molding of the insert and the bonding of the insert to the structure are carried out during a movement, in particular while the die moves from the top dead center to the bottom dead center. Sealing takes place at the bottom dead center. The die is then moved back towards the top dead center.

Preferably, the position of the bottom dead center of the movement is set in the control system, for example by input on the control panel or as a fixed value. Particularly preferably, the stamp moves towards the dead center and stops when the desired pressure force is reached, the value of which is measured and compared with a pressure force specified in the control system or entered on the control panel. Particularly preferably, the position and/or the time at which the position is reached is calculated, taking into account the inertia of the system in order to avoid accidentally overrunning the dead center. For example, the inertia of the system is taken into account by carrying out one or more reference runs, the movement of the stamp being carried out preferably very slowly at least from a position shortly before reaching the theoretical bottom dead center in order to determine, at least in a first approximation, the actual dead center, which results from the tolerances of the components and packaging parts involved, such as the structure and the insert being deformed. Preferably, further reference runs are then carried out with new packaging parts, in which the speed of the stamp movement is increased to the target speed and corrections are made if necessary based on the measured force curves. The expert understands that the reference run(s) can also be carried out from the beginning without reduction at the target speed and corrections are made if necessary based on the measured force curves.

Preferably, several structures, in particular a format of structures, are connected simultaneously to an insert by immersing a stamp into each structure. Preferably all stamps are driven by a common drive and the pressure force of this drive is adjusted to the number of structures and the area of the sealing seam between the insert and the structure. This is preferably done automatically, for example by the stamping tool having an identifier that contains this information, which can be read by the packaging machine.

Another object of the present invention is a method for separating the insert from the structure, for example for separate feeding for recycling, wherein a force of a maximum of 10 N is required for separating the insert from the structure.

The disclosure made for this subject matter of the present invention applies equally to the other subject matters of the present invention and vice versa. Features of this subject matter of the present application can be adopted in other subject matters of this application and vice versa.

According to the invention, the force required to detach the insert from the structure is a maximum of 10, particularly preferably < 8, particularly preferably < 6 N. The values are preferably determined in accordance with DIN 55409 T2. A ZWICK/ROELL AG Ulm tensile testing machine is preferably used for this purpose. The packaging is arranged at an angle of 45° and the removal speed is, for example, 600 mm/min. Such packaging is, for example, packaging for foodstuffs, where the weight of the insert has no or only a very small influence on the force used to detach the insert.

Preferably, the insert and/or the structure has a tab that can be grasped with two fingers, in particular the thumb and index finger of one hand. Preferably, the separation takes place in a separation direction that extends from one corner of the structure to the diagonally opposite corner of the structure.

Preferably, the insert is separated from the structure by machine. Preferably, the separation speed is kept constant.

Preferably, the peeling angle at which the insert is peeled off from the structure is 20 - 80°, preferably 30 - 70°, most preferably 40 - 60°.

The preferred take-off speed is 400 - 800 mm/min.

Figur 1

zeigt die erfindungsgemäße Verpackung.

Figur 2

zeigt die erfindungsgemäße Verbindung zwischen der Einlage und der Struktur.

Figur 3

zeigt den erfindungsgemäßen Stempel.

Figur 4

zeigt die Absenkphase des Stempels.

Figur 5

zeigt den Moment der Siegelung

Figur 6

zeigt das Formen der Folie.

Figur 7

zeigt eine Ausführungsform der erfindungsgemäßen Verpackung

Figuren 8 - 11

zeigen jeweils eine Ausführungsform des Stempels.

In the following, the invention is described on the basis of Figures 1 to 11 These explanations are merely examples and do not restrict the general concept of the invention.

Figure 1

shows the packaging according to the invention.

Figure 2

shows the inventive connection between the insert and the structure.

Figure 3

shows the stamp according to the invention.

Figure 4

shows the lowering phase of the stamp.

Figure 5

shows the moment of sealing

Figure 6

shows the forming of the foil.

Figure 7

shows an embodiment of the packaging according to the invention

Figures 8 - 11

each show a design of the stamp.

In Figure 1 the packaging tray 1 according to the invention is shown. This consists of an outer structure 2, here a cardboard structure 2 and an insert 3. In the present case, the cardboard structure is made of corrugated cardboard. The structure has side walls 2.1 and a base 2.2. The structure is preferably made of a flat cardboard in which the side walls 2.1 are folded up and glued together, for example. The side walls 2.1 are preferably not vertical on the base, but are arranged so that the cross-section of the cardboard structure tapers from top to bottom, which simplifies the connection/detachment of the structure to/from the insert. In the present case, the packaging tray, ie also in particular the structure, is quadrangular, here square. An insert 3, here a plastic film, is provided in the cardboard structure, which has a base 3.1, a side wall 3.2 and here a sealing edge 3.4. At the sealing edge 3.4, the packaging tray can be hermetically sealed with a lid 6 to form a finished package after a packaged item has been filled into the insert 3 of the packaging tray. The lid is connected to the insert here by a seal 7. The insert 3 is connected locally to the side wall 2.1 of the cardboard structure 2 at at least one, here four, connection points 5. This connection is preferably made in the upper edge area 3.5 of the side wall. In the present case, several connection points 5 are provided in the upper edge area 3.5, which are preferably linear and particularly preferably do not extend into the corners of the side walls of the structure. The linear connection points are preferably arranged parallel to the base 2.2 or 3.1. The connection 5 between the insert and the cardboard is preferably made by sealing. For this purpose, a sealing layer is preferably provided on the insert and/or on the structure. According to the invention, between the insert 3 and the cardboard structure 2, at least in sections, ie locally, a gas cushion 4 is provided. In the present case, the gas cushion 4 extends in the edge region, in particular all the way around, between the side wall 2.1 of the cardboard structure and the side wall 3.2 of the insert 3, in particular in the lower region of the packaging tray. Preferably, a gas cushion is also provided at least locally in the bottom region 2.2, 3.1. The gas cushion generally has the same pressure as the ambient pressure. In order to create the local distance between the insert 3 and the cardboard structure 2, the insert is preferably deformed by deep drawing in such a way that the deep-drawn insert does not correspond to the shape of the structure. This forms a gap, in particular a circumferential gap between the insert and the structure. The structure can have openings (not shown) by means of which a negative pressure can be created between the insert 3 and the structure 2. These openings are preferably not in the corner areas formed by two side walls 2.1 and the base 2.2 and/or in the corner area formed by a side wall 2.1 and the base 2.2 in order to avoid the insert being in contact with the structure over too large an area.

In the event that the insert is formed using negative pressure and has been preheated for this purpose, the negative pressure between the insert and the structure is preferably reduced before or while the insert is cooling. This allows any remaining elastic deformation of the insert to be used to form and/or increase the distance between the insert and the structure.

According to the invention, the structure in the connecting area 5 between the insert and the structure is deformed, here plastically deformed. This is in Figure 2 shown. The deformation 8 preferably occurs during sealing. The deformation can extend to the insert and the structure, even if only a deformation of the structure 2 is shown here. The deformation preferably extends along the inner circumference of the structure. Preferably, the deformation is not complete. Preferably, in particular, the corner regions formed by two side walls do not exhibit any deformation. Preferably, the insert is plastically and/or elastically formed into the deformation. Preferably, the deformation is uneven along the circumference. In particular, the width and/or depth of the deformation varies along the longitudinal extent of the deformation. The deformation can be plastic and/or elastic. An elastic deformation forms temporarily, in particular during sealing, and then regresses.

Based on Figure 3 an exemplary embodiment of the stamp 9 or the method for producing the connection is described. In this example, the stamp 9 is provided with a contour 11 in the area of the intended connection 5, which corresponds to the contour of the finished connection 5 at least approximately. The method includes dipping the stamp 9 into the insert and the structure along a direction of movement 10, in particular up to a bottom dead center, in which the stamp 9 can remain for a certain time before it is raised again. At the moment, preferably the bottom dead center, at which the stamp 9 presses the film against the structure at the intended connection 5, the desired connection pressure, here the sealing pressure, is built up and the connection of the insert with the structure takes place locally only at the desired connection points. Preferably before the sealing pressure has been fully built up, the plastic and/or elastic deformation of the structure, preferably the corrugated cardboard, and/or the insert takes place. The person skilled in the art will recognize that the circumferential flange of the insert does not necessarily have to be present. The film and/or the insert preferably has, at least in the region of the connection 5, preferably over the entire surface, a sealing layer, in particular a sealing layer that is suitable for a connection between the insert 3 and the structure, in particular corrugated cardboard. The sealing layer is preferably selected so that the material bond caused by it can be released with a force < 10N.

A preferred embodiment of the packaging tray according to the invention or the method according to the invention is described with reference to Figures 4 and 5 described. In the present case, the stamp 9 has a projection 12 on its outer contour 11, here a sealing nose, which preferably does not extend around the entire circumference of the stamp, but is only present locally. The sealing nose is preferably formed in a point-like and/or linear manner. The stamp preferably has a bevel 13. In the present case, the deformation of the insert 3 was carried out by overpressure and/or underpressure. The person skilled in the art understands that the shaping of the insert can also be carried out by the stamp 9 or can be supported by it. Figure 4 shows the stamp in its downward movement before it comes into contact with the insert. For this purpose, the stamp has a drive (not shown) which is preferably pressure-controlled, ie which drives the stamp 9, in particular moves it linearly, until a predetermined counterpressure is applied to the stamp. The stamp is then at its bottom dead center, where it remains for a preferably adjustable period of time before it is raised again. The stamp can be heated, in particular in the area of the sealing nose. Figure 5 shows the sealing of the insert to the structure. The sealing nose 12 deforms the insert 3 and, at the same time or slightly later, the structure 2 until the desired sealing pressure has been built up. The deformation of the insert 3 and/or the structure can be plastic and/or elastic.

Figure 6 shows an embodiment of the present invention in which the stamp 9 at least supports the forming of the insert 3. The stamp can be heated and/or cooled in the contact area with the insert in order to achieve a targeted flow of the material of the insert.

Figure 7 shows an embodiment in which the structure has a horizontal flange, where the connection 5, preferably sealing, between the insert and the structure is made. Furthermore, in Figure 7 the connection 7, preferably sealing, between a lid 6 and the insert 3 is shown. Preferably, the connections are at least partially congruent. Preferably, the two connections 5, 7 are created in two separate work steps, in particular the connection 5 in the first work step during the downward movement of the stamp when sealing the insert to the carton and the connection 7 in the second work step, preferably after a packaged item has been filled into the insert 3 of the packaging tray. Preferably, a sealing nose is provided on the stamp, which creates the connection 5. Preferably, the adhesive force of the two connections 5, 7 is different. According to another preferred embodiment, the connections 5, 7 are laterally offset. Preferably, the atmosphere in the packaging, i.e. in the space enclosed by the insert 3 and the lid 6, is air; equally preferably, the atmosphere is a protective atmosphere of a so-called MAP (modified atmospheric packaging); equally preferably, the atmosphere of the packaging is formed at least predominantly by a vacuum, for example in so-called skin packaging.

The Figures 8 -11 each show a possible design of the stamp.

Figure 8 shows a stamp without a sealing nose. The stamp is bevelled here to make it easier to remove from the mold after joining.

In the embodiment according to Figure 9 a sealing nose 12 is provided and the shape slope 13 is smaller compared to the embodiment according to Figure 8 . Figure 10 is an embodiment for fastening the insert to the flange of the structure. The sealing nose can be molded (left embodiment) or attached to the stamp as a sealing rubber (right embodiment). This stamp is suitable, for example, for the production of a packaging tray or packaging according to Figure 7 . The stamp can have only one molded sealing nose(s) or only one sealing rubber(s) to create the connection 5, 7. Alternatively, both embodiments can be implemented on one stamp. Since the molded sealing nose is generally less elastic than the sealing rubber, this allows areas with different pull-off forces to be achieved, particularly at the insert/structure connection, because the pressure during the seal varies from region to region. At the same time, the pressure between the lid 6 and the insert 3 is preferably always so great that a hermetically sealed connection is created.

Figure 11 shows a stamp with a sealing rubber as a sealing nose in the area of the bevelled section of the stamp.

List of reference symbols:

1

Packaging tray

2

Structure, cardboard structure, outer cardboard structure

2.1

Side wall

2.2

Floor

3

Insert made of film, especially plastic film

3.1

Floor

3.2

Side wall

3.4

Seal edge

3.5

upper edge area of the side wall

4

Gas cushion, air

5

Connection area

6

Cover foil

7

Connection between cover film and insert

8th

Deformation, plastic deformation, plastic and/or elastic deformation

9

Rubber stamp

10

Direction of movement of the stamp

11

Contour of the stamp

12

projection, sealing nose, sealing rubber

13

Draft angle

Claims (12)

1. Packaging tray (1) with an outer cardboard structure (2) in which an insert (3) composed of film is provided, wherein the cardboard structure is a corrugated cardboard and the structure and the film are locally connected to one another in a connecting region (5) in a materially bonded manner, characterized in that the structure is at least locally deformed in the connecting region.
2. Packaging tray according to Patent Claim 1, characterized in that the deformation is effected plastically and/or elastically.
3. Packaging tray according to either of the preceding patent claims, characterized in that the insert (3) and the structure bear against one another and/or are connected to one another only in the connecting region (5).
4. Packaging tray according to one of the preceding patent claims, characterized in that, during separation for recycling, no or only a small proportion of particles or particle groups detach from the cardboard or insert surface and/or no or only a small proportion of particles or particle groups possibly remain on the respectively other surface.
5. Packaging tray according to one of the preceding patent claims, characterized in that the cardboard structure is a corrugated cardboard with G-flute corrugations.
6. Packaging tray according to one of the preceding patent claims, characterized in that that surface of the corrugated cardboard which faces the insert is calendered.
7. Packaging tray according to one of Claims 1-6, characterized in that the corrugated cardboard has a corrugated structure with an original height, and in that the plastic deformation is < 80% of this height.
8. Packaging tray according to one of the preceding claims, characterized in that the maximum extent of an adhering individual particle or of a particle conglomerate is < 1 pm-50 µm, in particular 10 µm to 30 µm.
9. Packaging tray according to one of the preceding claims, characterized in that the area proportion of particles of the one component on the respective other component is < 5%, particularly preferably < 2%, even more preferably < 0.5%, based on the area of the material bond between the structure and the insert prior to separation thereof.
10. Packaging tray according to Claim 9, characterized in that the area proportion of cardboard particles on the surface of the film, in particular the plastics film, is < 5%, particularly preferably < 2%, even more preferably < 0.5%, based on the area of the material bond.
11. Method for producing a packaging tray according to one of the preceding patent claims, characterized in that the punch dips into the packaging tray and the insert is connected to the structure by local pressing of the punch against the film and the structure.
12. Method according to Claim 11, characterized in that the insert is separated from the structure with a force of at most 10 N.

Images