WO2020221936A1

WO2020221936A1 - Packaging container comprising an outer cardboard structure and an insert made of plastic film

Info

Publication number: WO2020221936A1
Application number: PCT/EP2020/062325
Authority: WO
Inventors: Gerd HÜBNER; Hans Günter DONGES
Original assignee: Gea Food Solutions Germany Gmbh
Priority date: 2019-05-02
Filing date: 2020-05-04
Publication date: 2020-11-05
Also published as: EP3962825A1; EP3962825B1

Abstract

The invention relates to a packaging tray comprising an outer cardboard structure inside which a plastic insert is provided. The invention further relates to a method for producing such a packaging tray and a packaging machine on which the packaging tray of said type and packaging to be produced thereby can be produced.

Description

Packaging container with an outer cardboard structure and an insert made of plastic film

The present invention relates to a packaging tray with an outer cardboard structure in which an insert made of film is provided. The present invention also 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 known, for example, from FR2933329, FR2826938, FR2883223, EP2097177A2, FR2610595 and DE19602829. However, the packaging trays described there are comparatively difficult to manufacture and have disadvantages, especially 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 structure, in particular cardboard structure, in which an insert made of film, in particular plastic film, is provided, the structure and the film, in particular plastic film, being locally cohesively connected to one another in a connection area, the structure in the Connection area is at least locally deformed rich.

The present invention relates to a packaging tray with an outer structure, in particular a special cardboard structure. The cardboard from which the structure is made can be a single or multi-layer cardboard material. The cardboard material preferably comprises cellulose, wood pulp and / or waste paper. The structure, in particular the cardboard box, can have air inclusions. For example, the structure, in particular the cardboard box, can be 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 the effects of liquids and / or water vapor. This layer is particularly preferably sealable. This cardboard structure is preferably produced by folding and, if necessary, a subsequent material connection, for example gluing a cardboard web or a cardboard blank. After folding, the cardboard structure can also be fixed in its folded structure by a form fit and / or force fit. The folded shape of the structure is preferably stabilized in its folded shape by the insert present according to the invention. Preferred corrugated cardboard consists of an outer cover, an inner cover, possibly one or more intermediate ceilings and at least one or more corrugations, which spaced the respective ceilings apart. In a further embodiment, at least two ceilings are connected to one another without intervening corrugations, for example the outer ceiling with the intermediate ceiling arranged behind it, for example when the outer ceiling is a printed web.

Single-wall corrugated cardboard is particularly preferred, which consists of an outer cover, an inner cover and a corrugation, preferably in between. The wave type G-wave is particularly preferred for the wave, for example according to DIN 55468 or according to the publication "wave types" of the Association of the Corrugated Cardboard Industry eV (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 shaft 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, very particularly preferably <0.65 mm.

An insert made of a film, in particular a plastic film, is introduced into this structure, in particular a cardboard structure. The film, in particular plastic film, can be any deep-drawable film known to those skilled in the field of food technology, preferably plastic film, for example the film, in particular plastic film, is a soft or hard film made of PP, PA / PE, PE, PVC, A-PET, paper or a sensible mixture or cohesively bonded layers of these components. The insert preferably has at least one barrier property which, for example, hinders or prevents 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 material bond with the surface of the structure under the influence of heat and / or pressure.

The insert is preferably made available as a flat film web, which is then formed into the structure by deep drawing. The deep drawing can take place with negative pressure and / or positive pressure and / or a stamp.

A gas cushion is now preferably 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 fact that the insert is shaped differently than the structure, so that there is a distance between the inlets. ge and the cardboard structure, in which there is gas, especially air. This distance is preferably greater than the usual tolerance, so that it is ensured that the insert and the box do not touch, at least in sections, especially if the insert is deep-drawn and is still heated to such an extent that it preferably shrinks slightly when it cools, but does particularly preferably only a small percentage of the deformation brought about by deep drawing is reduced again. 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, food is packaged in such a packaging container and heated in the packaging container - preferably by the action of microwaves; When handling such packaging containers, it is desirable if the temperature transfer from the heated food to the outside of the packaging container and from there in turn to the areas of human skin that come into contact with the packaging container is not unpleasant or even harmful for this person. Another example of the advantages of such gas cushions is the improved protection of sensitive packaged products.

In particular if the structure, in particular the cardboard box, has many air pockets, for example if the structure, in particular the cardboard box, 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, in particular predominantly, loose contact between the structure, in particular the cardboard structure and the insert, that is, the insert is at most locally laminated to the structure. Such a loose contact arises, for example, from the fact that 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 carton are loosely touching each other at least in sections, especially if the insert is deep-drawn and the shrinkback is hindered when the insert cools, for example by an extended and / or intensified deep-drawing process , for example through prolonged exposure to the vacuum or increased overpressure.

According to the invention, the structure and the insert are materially connected to one another. This material connection is preferably carried out by sealing. The structure and the insert are preferably materially connected to one another in the upper edge region of the side wall. This material bond is preferably only locally and not around the entire circumference. fend provided. The material bond is preferably carried out as a line or strip which, for example, has a width of 1-5 cm, preferably 5-20 mm. 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 overlapping areas between structure and insert, there is preferably no material bond between structure and insert. As a result, the insert is connected to the cardboard structure in a stable and permanent manner, but the connection can be released again relatively easily for disposal 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 multilayer 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, with the outer The layer of the composite film that comes into contact with the structure is designed as a PE sealing layer, for example to be sealed to a structure made of corrugated cardboard or solid cardboard. With these values, the corrugated cardboard is preferably designed as a G-flute.

The force required to detach the insert from the structure is preferably 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. The packaging is arranged at an angle of 45 ° and the withdrawal 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 are particularly preferred for the G waveform.

The deformation preferably takes place during sealing. Due to the deformation, for example, differences in the thickness of the structure can be taken into account. Furthermore, this improves the connection between the insert and the structure. In addition thereby the force and pressure distribution between the insert and the structure becomes 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 in that when the insert and the structure were separated with the human eye, easily visible particles or particle groups, for example, detached from the cardboard surface and largely remained on the insert, which in terms of pure separation for the Recycling at least of the insert and cardboard structure was not desired. It is quite astonishing that in the case of the packaging tray according to the invention, preferably due to the more uniform force or pressure distribution, no or only a small proportion of particles or groups of particles detach from the cardboard or insert surface and / or none or no when separating for recycling only a small proportion of particles or groups of particles may remain on the other surface.

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

The disclosure made in relation to this subject matter of the present invention applies equally to the other subjects of the present invention and vice versa. Features of this subject matter of the present application can be incorporated into other subjects of this application and vice versa.

The adhering particles are preferably not detectable with the naked eye. The maximum extent of an adhering individual particle or a particle conglomerate is preferably <1 pm-50 pm, in particular 10 pm to 30 pm. The area fraction of particles of the respective one component on the respective other component is <5%, particularly preferably <2%, even more preferably <0.5% based on the area of the bond between the structure and the insert before it is separated. The area proportion of cardboard particles on the surface of the film is preferably especially of the plastic film, <5%, particularly preferably <2%, even more preferably <0.5% based on the area of the bond, here the area of the sealed seam, between the cardboard, in particular the corrugated cardboard, and the plastic film before they are separated.

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

The die is preferably locally or completely heated and / or cooled, for example so that the film, which has been previously heated for sufficient formability, does not cool down undesirably during the forming process and / or areas that tend to be thinning out, for example the corners / edges of the insert, can be provided somewhat cooler, in order to at least somewhat restrict their deformability and thus to avoid an excessive decrease in thickness or even tearing during molding.

The punch preferably moves between an upper and a lower dead center, the inlay preferably being shaped in the downward movement and the inlay being sealed to the structure in the lower dead center.

The side walls of the structure are preferably provided at least in sections not perpendicular, but rather at an angle. The punch preferably also has a slope, the angle of the two slopes being able to 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, for example rubber. The sealing nose can also be made from 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 tray and the insert is connected to the structure by locally pressing the stamp against the film and the structure.

The inlay is preferably formed and the inlay is connected to the structure during a movement, in particular while the punch is moving from the top to the bottom dead center. Sealing takes place in the bottom dead center. Then the punch is moved back towards top dead center.

The position of the bottom dead center of the movement is preferably set in the controller, for example by inputting it on the control panel or as a fixed value. Particularly preferably, the punch moves in the direction of dead center and stops when the desired compressive force is reached, the value of which is measured and compared with a compressive force specified in the control or entered on the control panel. The position and / or the point in time at which the position was reached is particularly preferably calculated and the inertia of the system taken into account in order to avoid unintentional overshooting of the dead center. For example, the inertia of the system is taken into account by performing one or more reference runs, the movement of the ram, at least from a position shortly before reaching the theoretical bottom dead center, preferably being carried out very slowly, around the actual dead center, which is due to the tolerances of those involved Components and packaging parts such as the structure and the insert that is undergoing deformation results, at least in a first approximation, to determine it. Further reference runs are then preferably carried out with new packaging parts, in which the speed of the stamp movement is increased to the target speed and, if necessary, corrections are made on the basis of the measured force curves. The person skilled in the art understands that the reference travel (s) can also be carried out from the beginning without a reduction at the target speed and, if necessary, corrections can be made on the basis of the measured force curves.

A plurality of structures, in particular a format of structures, are preferably connected to an insert at the same time by a stamp dipping into each structure. Preferential wise, all punches are driven by a common drive and the pressure force of this drive is adapted to the number of structures and the area of the sealing seam between insert and structure. This is preferably done automatically in that the stamping tool has, for example, an identifier that contains this information that can be read out 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, a force of a maximum of 10 N being required to separate the insert from the structure.

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. The packaging is arranged at an angle of 45 ° and the withdrawal speed is, for example, 600 mm / min. Such packaging is, for example, packaging for foodstuffs in which the weight of the insert has no or only a very little influence on the force that is used to detach the insert.

The insert and / or the structure preferably has a flap which can be grasped with two fingers, in particular the thumb and index finger of one hand. The separation is preferably carried out by means of a separation direction which extends from one corner of the structure to the diagonally opposite corner of the structure.

The insert is preferably separated from the structure by machine. The separation speed is preferably kept constant.

The peel angle at which the insert is peeled off from the structure is preferably 20-80 °, preferably 30-70 °, very particularly preferably 40-60 °.

The withdrawal speed is preferably 400-800 mm / min. The invention is explained below with reference to FIGS. 1 to 11. These explanations are merely exemplary and do not restrict the general inventive concept.

Figure 1 shows the packaging according to the invention.

Figure 2 shows the connection according to the invention 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 film.

FIG. 7 shows an embodiment of the packaging according to the invention

Figures 8-11 each show an embodiment of the stamp.

The packaging tray 1 according to the invention is shown in FIG. 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 floor 2.2. The structure is preferably made from a flat cardboard box, in which the side walls 2.1 are folded up and, for example, glued together. The side walls 2.1 are preferably not perpendicular to the floor, but are arranged in such a way that the cross section of the cardboard structure tapers from top to bottom, which simplifies connecting / detaching the structure with / from the insert. In the present case, the packaging tray, that is, in particular, the structure is square, provided here square table. In the cardboard structure, an insert 3, here a plastic film, is provided, which has a bottom 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 cover 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 here by a Siege treatment 7 with the insert. The insert 3 is locally connected 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 carton 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 area, in particular circumferentially, 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 area of the packaging tray. A gas cushion is preferably also provided at least locally in the bottom area 2.2, 3.1. The gas cushion usually has the same pressure as the ambient pressure. In order to generate 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 generated between the insert 3 and the structure 2. These openings are preferably not in the corner areas that are formed by two side walls 2.1 and the bottom 2.2 and / or in the corner area that is formed by a side wall 2.1 and the bottom 2.2 in order to avoid that the insert is too large on the Structure.

In the event that the insert is molded with negative pressure and has been previously heated for this purpose, the negative pressure between the insert and the structure is preferably reduced before or while the insert is cooling. As a result, any elastic deformation of the insert that is still present can be used to form and / or increase the distance between the insert and the structure.

According to the invention, the structure in the connection area 5 between the insert and the structure is deformed, here plastically deformed. This is shown in FIG. The deformation 8 occurs preferably during the victory. The deformation can extend to the insert and the structure, even if only one deformation of the structure 2 is shown here.

The deformation preferably extends along the inner perimeter of the structure. The deformation is preferably not complete. In particular, the corner regions which are formed by two side walls preferably have no deformation. The insert is preferably shaped plastically and / or elastically into the deformation. The deformation is preferably uneven along the circumference. In particular, the width and / or depth of the deformation varies along the length of the defor mation. The deformation can be plastic and / or elastic. An elastic deformation develops temporarily, especially during victory, and then recedes.

An exemplary embodiment of the stamp 9 or the method for establishing the connection is described with reference to FIG. In this example, the punch 9 is provided in the area of the intended connection 5 with a contour 11 that corresponds to the contour of the finished compound 5 is at least roughly the same. The method includes immersing the punch 9 in the insert and the structure along a direction of movement 10, in particular special up to a bottom dead center, in which the punch 9 can stay for a certain time before it is raised again. At the moment, preferably the bottom dead center, when the punch 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 between the insert and the structure takes place locally only on the desired connection points. The plastic and / or elastic deformation of the structure, preferably the corrugated cardboard and / or the insert, takes place preferably before the sealing pressure has been completely built up. The person skilled in the art recognizes 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 area of the connection 5, preferably over the entire surface, a sealing layer, in particular a sealing layer which is suitable for a connection between the insert 3 and the structure, in particular corrugated cardboard. The sealing layer is preferably selected in such a way that the material bond it causes can be released with a force of <10N.

A preferred embodiment of the packaging tray according to the invention or the method according to the invention is described with reference to FIGS. 4 and 5. In the present case, the stamp 9 has on its outer contour 11 a projection 12, 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 at points and / or linearly. The punch preferably has a bevel 13. The deformation of the insert 3 took place in the present case by an overpressure and / or underpressure. The person skilled in the art understands that the inlay can also be formed by the punch 9 or can be supported by it. Figure 4 shows the punch 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 shifts it linearly, until a predetermined counter pressure is applied to the stamp. Then the stamp is at its bottom dead center, where it stays for a preferably adjustable period of time before it is raised again. The stamp can be heated, particularly 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 offset in time 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. FIG. 6 shows an embodiment of the present invention in which the stamp 9 at least supports the shaping 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.

FIG. 7 shows an embodiment in which the structure has a flange, here horizontal, on which the connection 5, preferably sealing, takes place between the insert and the structure. Furthermore, the connection 7, preferably a seal, between a cover 6 and the insert 3 is shown in FIG. The connections are preferably at least partially congruent. The two connections 5, 7 are preferably carried out in two separate work steps, in particular the connection 5 in the first work step during the downward movement of the stamp when the insert is sealed to the carton and the connection 7 in the second work step, preferably after a packaged item is filled into the insert 3 of the packaging tray has been generated. A sealing nose which creates the connection 5 is preferably provided on the die. The adhesive force of the two connections 5, 7 is preferably different. According to another preferred embodiment, the connections 5, 7 are laterally offset. The atmosphere in the packaging, that is to say in the space which is enclosed by the insert 3 and the lid 6, is preferably air; likewise preferably, the atmosphere is a protective atmosphere of a so-called MAP (modified atmoshere packaging); likewise preferably the atmosphere of the packaging is formed at least predominantly by a vacuum, for example in the case of so-called skin packaging.

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

FIG. 8 shows a stamp without a sealing nose. The punch is bevelled here to make it easier to demold after joining.

In the embodiment according to FIG. 9, a sealing lug 12 is provided and the bevel 13 is designed to be smaller in comparison with the embodiment according to FIG. 8. FIG. 10 is an embodiment for fastening the insert to the flange of the structure. The sealing nose can be molded on (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 FIG. 7. The stamp can have only one molded-on sealing nose (s) or only one sealing rubber (s) to produce the connection 5, 7. Alternatively, however, both embodiments can also be implemented on one stamp. Since the molded-on sealing nose is generally less elastic than the sealing rubber, areas with different pull-off forces can thereby be achieved, particularly at the connection between insert and structure, because the pressure during the Siegel is different in areas. At the same time, the pressure between cover 6 and insert 3 is preferably always so great that a hermetically closed connection is created.

Figure 11 shows a stamp with a sealing rubber as a sealing nose in the area of the chamfered portion of the stamp.

List of reference symbols:

1 packaging tray

2 structure, carton structure, outer carton structure

2.1 side wall

2.2 soil

3 Foil insert, especially plastic foil

3.1 soil

3.2 side wall

3.4 Seal edge

3.5 upper edge area of the side wall

4 gas cushions, air

5 Connection area

6 cover film

7 Connection between cover film and insert

8 Deformation, plastic deformation, plastic and / or elastic deformation

9 stamps

10 Direction of movement of the punch

1 1 contour of the stamp

12 projection, sealing nose, sealing rubber

13 draft angle

Claims

Patent claims:

1. Packaging tray (1) with an outer structure (2), in particular a cardboard structure (2), in which an insert (3) made of foil is provided, the structure and the foil being connected to one another locally in a connection area (5), characterized in that the structure is at least locally deformed in the connection area.

2. Packaging tray according to claim 1, characterized in that the deformation takes place plastically and / or elastically.

3. Packaging tray according to one of the preceding claims, characterized in that the insert (3) and the structure rest 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 claims, characterized in that no or only a small proportion of particles or groups of particles are released from the cardboard or insert surface during separation for recycling and / or no or only a small proportion of particles or Particle groups may remain on the other surface.

5. Packaging tray according to one of the preceding claims, characterized in that the cardboard structure is a corrugated cardboard, in particular a corrugated cardboard with G-waves.

6. Packaging tray according to one of the preceding claims, characterized in that the surface of the corrugated cardboard facing the insert is satined.

7. Packaging tray according to one of claims 2-6, characterized in that the corrugated cardboard has a corrugated structure with an original height and 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 a particle conglomerate is <1 pm - 50 pm, in particular 10 pm to 30 pm.

9. Packaging tray according to one of the preceding claims, characterized in that the area fraction of particles of the one component on the other component <5%, particularly preferably <2%, even more preferably <0.5% based on the area of the Cohesive bond between the structure and the insert prior to their separation.

10. The method according to claim 9, characterized in that the area proportion of cardboard particles on the surface of the film, in particular the plastic film, <5%, particularly preferably <2%, even more preferably <0.5% based on the area of the Material bond is.

11. Packaging machine according to one of the preceding claims or the preamble of claim 1, characterized in that the insert is connected to the structure by means of a stamp.

12. Packaging machine according to claim 11, characterized in that the stamp is locally or completely heated and / or cooled.

13. A method for producing a packaging tray according to one of the preceding claims, characterized in that the stamp is immersed in the packaging tray and the insert is connected to the structure by locally pressing the stamp against the film and the structure.

14. The method according to claim 13, characterized in that the separation of the insert from the structure takes place with a force of 10 N maximum.