WO2020148260A1

WO2020148260A1 - Recycling-friendly blister packaging

Info

Publication number: WO2020148260A1
Application number: PCT/EP2020/050776
Authority: WO
Inventors: Fabio DAIDONE; Andreas GMEINDNER; Ulf KÖTZ; Tobias Fackler
Original assignee: Huhtamaki Flexible Packaging Germany Gmbh & Co. Kg
Priority date: 2019-01-16
Filing date: 2020-01-14
Publication date: 2020-07-23
Also published as: EP3911580A1; ES2946048T3; EP3911580B1; DE102019101066A1

Abstract

The invention relates to a blister packaging (100) with a front wall (20) and a rear wall (30) which are connected together face to face with the inclusion of a receiving area (60) between said walls, wherein a joint region (52) in which the front wall (20) and the rear wall (30) are connected together completely surrounds the receiving area (60), and the front wall (20) and the rear wall (30) is each made of a polymer layer assembly (22, 26). At least one polymer layer assembly (22, 26), in the form of an opening layer assembly (24) in the region of extension of the receiving area (60), has a material weakness formation (70) which reduces the tear and/or burst resistance of the opening layer assembly (24) compared to an identically designed polymer layer assembly (22, 26) which is unweakened. The opening layer assembly (24) has an unweakened region (90) which is peripherally closed about the material weakness formation (70) and in which the opening layer assembly (24) is free of material weaknesses, and more than 95 wt.% of the front wall (20) and the rear wall (30) combined is made of polymer layers (32, 36) of the same polymer family.

Description

Recyclable blister packaging Description

The present invention relates to a push-through packaging with a front wall and a rear wall which are connected to one another with the inclusion of a receiving space between them. The present invention further relates to a poly merlagenanordnung to form a front wall and / or a rear wall of such a blister pack.

Push-through packaging has been known for some time, for example for the occasional packaging of tablets, chewing gum or other individually packaged piece goods. For this purpose, so-called blister packs, which were designed to be transparent or opaque and consisted of a combination of a plastic film and an aluminum cover that could be opened, were usual for this purpose. The aluminum cover was destroyed when the packaging was opened by removing the packaged item from the opposite side, i.e. H. was pressed against the inside of the aluminum cover from the plastic film side of the packaging until it no longer withstood the pressure exerted and burst or was separated from the plastic film. As a material for such known blister packs, deep-drawn polyvinyl chloride was generally used in combination with polyethylene to obtain diverse polyvinyl chloride, from which a packaging container was formed, which was then closed with the aluminum cover. For this purpose, the aluminum cover was coated on one side with a thin sealing layer, usually heat sealing lacquer.

Previously known push-through packaging has several disadvantages. A considerable amount of force is required to open such known packaging, since the aluminum cover had to be broken through, but this had a high push-through resistance due to its metal structure and its thickness, which is necessary in order to produce a stable and tight push-through packaging according to the previously known structure . Another major disadvantage of these previously known push-through packaging is the costly use of materials, namely the use of an aluminum foil in a high layer thickness, and also the fact that a variety of different materials, such as plastics, are used in combination with aluminum due to their heterogeneity, but also the high layer thickness of aluminum are difficult to recycle.

The invention has for its object to provide a technical teaching with which the aforementioned disadvantages of push-through packaging can be avoided.

This object is achieved by a push-through packaging with a front wall and a rear wall, which are connected to one another with the inclusion of a receiving space between them, a joining area in which the front wall and the rear wall are connected to one another completely surrounds the receiving space. The front wall and the rear wall are each formed from a polymer layer arrangement, wherein at least one polymer layer arrangement as an opening layer arrangement in the extension area of the receiving space has a tear or / and the burst strength of the opening layer arrangement in comparison to an identically constructed, but non-weakened polymer layer arrangement reducing material weakening formation. The opening position arrangement has a non-weakened area which runs around the material weakening formation and in which the opening position arrangement is free of material weakening. The front wall and the rear wall taken together are formed to more than 95% by weight from polymer layers of the same polymer family.

By forming the material weakening formation in one of the polymer layer arrangements, the tensile strength and / or the bursting strength of the then serving as opening layer arrangement, because the polymer layer arrangement intended for opening the receiving space, can be reduced to such an extent that a solid body accommodated in the receiving space passes through the opening layer arrangement under local Task of the material relationship of the opening position arrangement from the push-through Package can be removed. The opening position arrangement of the push-through packaging can be so heavily loaded by the user with the solid body accommodated in the receiving space that it bursts or tears at the location of the material weakening formation.

By forming the front wall and the rear wall of the push-through packaging in such a way that together they are formed to more than 95% by weight from polymer layers of the same polymer family, a sufficiently pure push-through packaging is obtained which after use, i.e. after emptying its at least one receiving space , effectively and efficiently and can be recycled extensively with relatively little effort. For example, the polymer of the same polymer family of push-through packaging can be recovered as a material and used again to produce new products with the participation of polymers.

Characterized in that the material weakening formation is formed in the area of the receiving space, but is surrounded by an un weakened area of the opening position arrangement, the polymer layer arrangement designed to open the receiving space, i.e. the opening position arrangement, is only weakened locally by the material weakening formation where this is necessary . In areas in which an opening of the receiving space is not desired or is not possible due to the design of the push-through packaging, the opening layer arrangement is not weakened and is provided with its maximum possible strength and tightness due to its design.

The material weakening formation does not completely penetrate that wall of the front wall and / or rear wall in the thickness direction, so that the receiving space is hermetically sealed from the outside environment by the front wall, the rear wall and their connection to one another. Therefore, the material weakening formation for facilitating opening of the receiving space is preferably formed only in part of the polymer layers of the opening layer arrangement. The push-through packaging is only formed by the front wall and the rear wall that is permanently connected to it when used as intended. The permanent, non-peelable connection of the front and rear wall can be formed by heat sealing or by gluing. Each polymer layer arrangement thus preferably forms both an outside of the push-through packaging and an inside of the push-through packaging delimiting the receiving space.

The reduction in the tensile strength and / or bursting strength of the opening layer arrangement by forming the weakening formation can be adjusted in terms of amount by designing the weakening formation accordingly. Thus, the depth of the material weakening formation with which this locally cancels a material relationship in the thickness direction of the opening layer arrangement can also be selected in accordance with the respective requirements, as can the dimensions of a perforation of a thickness section of the opening layer arrangement. Thus, in the example of a perforation as the weakening formation, the length of the non-weakened material remaining between two weakening perforations can be selected in accordance with the desired tensile strength and / or burst strength.

In an advantageous manner, the material weakening provided in the opening layer arrangement is designed in a mechanical manner, for example by blades and / or needles, for example by machining with a roller provided with blades and / or with needles. In this way, complex and expensive perforation or partial slitting of the opening layer arrangement by means of laser beams can be avoided and conventional mechanical tools can be used, which are often used in any case on conventional packaging machines, such as strip packaging systems. A material weakening formation formed by laser should not, however, be excluded.

Preferably, the front wall consists only of the polymer layer arrangement mentioned. Likewise preferably, the rear wall consists only of the polymer layer arrangement mentioned. However, it is also conceivable that the front wall and / or the rear wall has more layers than just the polymer layer arrangement, which, however, are applied separately and subsequently to the front and / or rear wall, for example by arranging a separate label on the outside of the respective wall. The additional layer that is applied subsequently can take up a smaller area than the wall that supports it. The push-through packaging - without filling material - preferably also consists of one or more polymers of the same polymer family, with a separately applied label, to more than 95% by weight.

According to a preferred embodiment of the invention, the material weakening extends over a central region of the receiving space and / or along at least a portion of a receiving space edge laterally delimiting the receiving space. In this way, it can be structurally determined how and at what point the opening layer arrangement delimiting the receiving space, as intended, bursts or tears when pressure is exerted. Advantageously, it can be avoided that the initially packaged object is thrown out of the blister pack when it is removed from the receiving space, as could be the case with previously known blister packs sealed with an aluminum foil.

In this case, the material weakening advantageously extends either over a central region of the receiving space, so that the filled-out product comes to lie directly under the packaging in the case of a novel push-through packaging that is held horizontally, or else directly into the hand of a user due to the pressing-out of a film gap falls.

According to an alternative embodiment, the material weakening extends along at least a portion of a track running adjacent to an edge of the receiving space. In this case, the opening gap resulting from the pushing out is generated at an edge of the receiving space, through which in turn the packaged goods can be removed in a targeted manner. The material weakening can also be designed to be completely closed, so that a section of the opening position arrangement surrounded by it completely can be removed or this section remains connected to the rest of the push-through packaging only along a portion of the boundary of the receiving space.

In principle, variety purity is a helpful prerequisite for the recyclability of packaging made from polymer layers. The recyclability of the push-through packaging presented here can be further improved if not only the packaging as a whole, but that each of its walls is taken on its own, i.e. that both the front wall and the rear wall are taken individually by more than 95% by weight. -% are formed from polymer layers of the same polymer family.

The stated limit of 95% by weight is only a lower limit for the variety purity. Preferably, more than 98% by weight of the front wall and the rear wall are taken together, more preferably the front wall and the rear wall are taken on their own, formed from polymer layers of one and the same family of polymers.

The polymer family can be polyester, for example preferably polyethylene terephthalate, which enables the formation of particularly thin polymer layer arrangements with a given strength of the polymer layer arrangements. However, the polymer family is preferably the family of polyolefins. On the one hand, these are inexpensive and also enable the formation of heat-sealable layers which can be used directly for connection to other polymer layer arrangements to form a push-through packaging. “Polymer layer” in the present application is therefore preferably to be understood as “polyolefin layer” and “polymer film” is preferred as “polyolefin film”. Polyolefin comprises at least polyethylene, polypropylene and / or cyclo-olefin copolymer (COC).

In order to increase the environmental friendliness of the push-through packaging, the push-through packaging, and thus both the front wall and the rear wall, are preferably free of chlorinated polymers, in particular free of frequently in the prior art for Push-through packaging uses plastics such as polyvinyl chloride (PVC) and polyvinylidene chloride (PVDC).

To provide a push-through packaging with a barrier effect against the passage of water vapor and oxygen through the front and rear walls, it can be provided that the polymer layer arrangement of the front wall and / or the rear wall has an oriented polymer film.

Due to the barrier effects that can be achieved with oriented polymer films, push-through packaging, and thus both the front wall and the rear wall, can be free of metal layers and / or metallization layers, in particular free of aluminum layers, to improve their environmental friendliness.

The push-through packaging can be designed with a certain degree of certainty against an undesired opening by children in that the oriented polymer film is a biaxially oriented polymer film. This is particularly relevant if the blister pack contains medication or active pharmaceutical ingredients.

In order to provide consumer information on the push-through packaging, the oriented polymer film can have a printing order layer applied in the straight printing method and / or in the reverse printing method. As a rule, the oriented polymer film will only have one of the two print job layers, although it should not be ruled out that a first piece of information should always be accessible from the outside when the push-through packaging is seen and a second piece of information after the opening of the receiving space.

As indicated above in connection with the childproofing of the push-through packaging, the oriented polymer film, in particular the biaxially oriented polymer film, is generally the polymer film of a polymer layer arrangement with the greatest tear or / and burst strength. Therefore, in order to facilitate opening of the push-through packaging, it is advantageous if the opening layer arrangement has one or has the above-mentioned oriented polymer film, the oriented polymer film having the weakening formation. The material weakening formation can have one or more local reductions in the thickness of the oriented polymer film, for example incisions, and / or one or more local penetrations completely penetrating the oriented polymer film in the thickness direction.

Advantageously, the polymer layer arrangement of the front wall and / or the rear wall can have a non-oriented polymer layer, for example in order to provide a heat-sealable outer polymer layer or / and to provide an extrusion lamination layer arranged between two layers.

The easiest and yet with very high precision, the non-oriented polymer layer can be applied by extrusion coating.

Since the opening layer arrangement should also be able to be connected by heat sealing to a further polymer layer arrangement to form the push-through packaging or, under certain circumstances, should be able to have a further layer laminated on, it is advantageous if the opening layer arrangement has a non-oriented polymer layer. The non-oriented polymer layer is preferably closer to the receiving space than the oriented polymer film.

Advantageously, the non-oriented polymer layer in the area of the receiving space is free from material weaknesses, so that the above-mentioned oriented polymer film can be provided with the material weaknesses and the non-oriented polymer layer can be applied to the entire surface of the latter by means of extrusion coating. The un weakened polymer layer can thus reduce the reduction in the barrier effect caused by the material weaknesses in the oriented polymer film.

In order to compensate as much as possible or at least limit the reduction in the barrier effect caused by the material weaknesses in the oriented polymer film, according to an advantageous further development of the present The present invention material of the non-oriented polymer layer protrude into the material weakening formation and fill the material weakening formation at least partially, preferably completely.

A parameter which is important for the stability and durability of the product accommodated in the receiving space of the blister packaging is the accessibility of the product for water vapor. If only one of the polymer layer arrangements of the front wall and the rear wall forms an opening layer arrangement with a material weakening formation, the barrier effect of the un weakened polymer layer arrangement, which is not an opening layer arrangement, is generally not critical. This can always provide a necessary barrier effect through a suitable choice of material and layer thickness. In contrast, the opening position arrangement, which is at least partially weakened in its integrity by the material weakening formation, is remarkable. In this case, the oriented polymer film and the non-oriented polymer layer should be selected such that the opening layer arrangement has a water vapor transmission rate of not more than 0.7 g / m ² , preferably not more than 0.5 g / m ² , stronger preferably of not more than 0.25 g / m ² , most preferably of not more than 0.15 g / m ² , measured according to ASTM F1249 at 38 ° C. and 90% relative humidity.

A second relevant parameter for the stability and durability of the filling material accommodated in the receiving space is the accessibility of the filling material for oxygen. Here too, as a rule, an un weakened polymer layer arrangement free of material weakening formation is not critical and essentially the opening layer arrangement has to be observed. In this case, the oriented polymer film and the non-oriented polymer layer should be selected such that the opening layer arrangement more preferably gives an oxygen transmission rate of not more than 1 cm ³ / m ² , preferably not more than 0.7 cm ³ / m ² of not more than 0.6 cm ³ / m ² , most preferably not more than 0.4 cm ³ / m ² , measured according to ASTM D3985 at 23 ° C and 50% relative humidity. The amount of the barrier effect of the polymer layer arrangement, which is not an opening layer arrangement, is also in the above-mentioned ranges. It is preferably as good as or better than the barrier effect of the non-opening position arrangement.

Although it can be thought that the polymer layer arrangements of the front wall and the rear wall each have a different layer structure, for example because one or more polymer layers of the opening layer arrangement are formed thicker than in the un weakened polymer layer arrangement due to the material weakening formation provided there, is for simplification In the production of the push-through packaging, it is preferably thought that the polymer layer arrangements of the front wall and the rear wall have an identical layer structure. It is about the layer structure, that is, the sequence of layers of the polymer layer arrangement in the thickness direction with regard to layer material and layer thickness. Any possible weakened material formation is not taken into account when assessing the layer structure.

Although it is preferred that a polymer layer arrangement for exerting force on it is arranged without weakening, in order to locally push through the respective different polymer layer arrangement than the opening layer arrangement due to the application of force, a push-through packaging can also be designed such that it is equally on the front wall as well can be opened on the rear wall. This is particularly advantageous if a product is packed in the push-through packaging, which, if necessary, can be accessed in a very short time and / or without deeper prior considerations. Therefore, it can be seen that the polymer layer arrangements of both the front wall and the rear wall each have a tear or / and burst strength in comparison to an identically constructed, but non-weakened polymer layer arrangement which reduces the material weakening formation, each of the polymer layer arrangements closing one around the material weakening formation encircling un weakened area in which the respective polymer layer arrangement is free of material weakening. Preferably, if both polymer layers Arrangements, both the front wall and the rear wall, each have a weakening formation, both polymer layer arrangements have the same weakening formations. This makes it possible to form both the front wall and the rear wall from one and the same supply roll of polymer layer arrangement.

As an alternative to the above-mentioned case that the non-oriented polymer layer forms an external heat-sealable layer, the non-oriented polymer layer can be arranged as an extrusion lamination layer between the oriented polymer film and a further polymer film for producing a lamination connection of the oriented polymer film with the further polymer film. The further polymer film is also preferably formed from the same family of polymers as the other polymer layers, in order to meet the condition that at least 95% by weight of the front and rear walls are taken together or even that the front wall and the rear wall are taken on their own, from one Polymer of the same family of polymers are formed.

The above-mentioned polyolefin is preferably polypropylene. The non-oriented polymer layer, whether in the un weakened polymer layer arrangement or / and in the opening layer arrangement, can comprise polyethylene or / and polypropylene or / and cyclo-olefin copolymer. If the non-oriented polymer layer has two or more of these materials, these can be in the form of blends and / or coextruded layers.

In principle it applies that in the present application a polymer film is also a polymer layer. In contrast to an extruded polymer layer, which is only produced during its extrusion, the polymer film is integrated into the polymer layer arrangement as a prefabricated polymer layer. The polymer film already existed as a polymer layer before it was included in the polymer layer arrangement. Not every polymer layer is therefore a polymer film.

In order to supply a consumer with a plurality of products packed with it when purchasing a push-through packaging, in a preferred embodiment the push-through packaging can have a plurality of receiving spaces, each with one Have material weakening formation and a surrounding weakened area. In order to be able to separate out a daily requirement or a single recording space individually from such a large push-through packaging with a plurality of connected recording spaces, different separating-material weakenings can be provided between adjacent, non-weakened areas, both in the front wall and in the rear wall, of the material weakening formations of the recording rooms, that at the place of their training, compared to an identically constructed push-through packaging without weakening separating material, reduce the tear strength of the push-through packaging. The separating material weakenings thus add to the material weakening formations in the area of the receiving spaces.

The above-mentioned object is also achieved by a polymer layer arrangement for forming a front wall and / or a rear wall of a push-through packaging as described and developed above. The polymer layer arrangement has a tear or / and the burst strength of the polymer layer arrangement in comparison to an identically constructed, but non-weakened polymer layer arrangement reducing material weakening formation, with the polymer layer arrangement minimizing its loss of strength due to the material weakening formation, a non-weakened area encircling the material weakening formation having. In this non-weakened area, the polymer layer arrangement is free from material weakening. The polymer layer arrangement is formed from polymer layers of the same polymer family to achieve uncomplicated and far-reaching reusability to more than 95% by weight. To provide a desired strength, the polymer layer arrangement comprises an oriented polymer film, which in turn has the material weakening formation. In order to maintain its barrier effect against the passage of oxygen or / and water vapor, the polymer layer arrangement comprises a polymer layer which is not oriented towards material weaknesses, material of the non-oriented polymer layer being used to at least partially compensate for the loss of barrier action caused by the material weakness formation in the material. rial weakening formation protrudes and the material weakening formation at least partially, preferably completely fills.

The invention is described below using exemplary embodiments which are explained in more detail with reference to the figures. Here show:

1 is a schematic plan view of a push-through package according to the invention with, for example, eight receiving spaces,

2 shows a schematic cross-sectional view of the push-through packaging shown in FIG. 1 along the plane II-II in FIG. 1,

3 shows a schematic longitudinal sectional view of the push-through packaging from FIG.

1 along the plane III-III in FIG. 1, with the filling material pressed out,

4 shows a schematic perspective view which illustrates how a piece-like filling material is pressed out of the push-through packaging according to the invention,

5A is a schematic cross-sectional view of a face-printed opening layer assembly of the present invention, and

FIG. 5B is a schematic diagram corresponding fundamentally to the view of FIG. 5A

Cross-sectional view of a further embodiment of an opening layer arrangement of the present invention printed in reverse printing with another polymer film which has been laminated onto it.

In the following description, the same reference numerals are used for the same and equivalent parts.

Fig. 1 shows a schematic representation of a push-through package 100 according to the invention with a total of eight separable packaging compartments 10 in two rows of four arranged side by side. The push-through packaging 100 and thus each packaging compartment 10 has a front wall 20 and a rear wall 30, which are connected to one another by heat sealing within the longitudinal edges 40 and the transverse edges 50 of the packaging compartments 10 in a joining area 52 such that the push-through packaging 100 between the In front of the wall 20 and the rear wall 30 defines a receiving space 60. The viewer of FIG. 1 looks at the front wall 20.

The push-through packaging 100 has in the example shown in one or more layers, but not in all layers, of the polymer layer arrangement 22 forming the front wall 20, a material weakening formation 70 which is formed in a central area 80 of the receiving space 60 of each packaging compartment 10. The area of each material weakening formation 70 is identified by a dashed rectangle.

The material weakening formation 70 can have any shape. In order to keep the extent of an impairment of the material integrity of the polymer layer arrangement 22 of the front wall 20, which is an opening layer arrangement 24 in the sense of the present application, caused by the formation of the material weakening formation 70, the material weakening in the illustrated embodiment is a punctiform perforation of a thickness region of the opening layer arrangement 24 in a regular manner Dot pattern.

An un weakened area 90 surrounds each material weakening formation 70 in a closed manner, so that the material weakening formation 70 does not extend beyond the receiving space 60 in the exemplary embodiment. However, this does not have to be the case. The material weakening formations 70, in deviation from the position shown in FIG. 1, can also extend into the joining area 52. To ensure sufficient strength of the push-through packaging 100, however, there is always an un weakened area 90, which is free of material weakening formations, each a single material weakening formation 70. The individual packaging compartments 10 can be separated along their respective mutually facing edges of the longitudinal edges 40 and the transverse edges 50 by a separating material weakening 54. The separation material weakening 54 completely penetrates the push-through packaging 100 in the joining area 52 as a perforation, that is to say at a distance from the respective receiving spaces 60.

FIG. 2 shows a schematic illustration of the push-through packaging 100 shown in FIG. 1 in a cross-sectional view, it being easy to see how lumpy filling material 62, for example tablets, is arranged in the respective receiving spaces 60 of the push-through packaging 100. The filling material 62 can also be seen in FIG. 1, since the push-through packaging 100 shown in FIG. 1 is shown transparently in the area of its respective receiving spaces 60.

The polymer layer arrangement of the rear wall 30 is designated by 26 in FIG. 2, which preferably has the same layer structure as the opening layer arrangement 24 of the front wall, for the sake of the simplest possible positioning. However, in the example shown, the polymer layer arrangement 26 in the region of the receiving spaces 60 is completely undiminished, that is to say with the exception of the separating material weakening 54 which does not influence the packaged filling material 62 and is free of material weakening.

FIG. 3 shows a schematic illustration of the push-through package 100 shown in FIG. 1 in a longitudinal sectional view, illustrating the manner in which the lumpy filling material 62 can be pressed out of the push-through packaging 100 according to the invention. For this purpose, as shown in FIG. 3, pressure is exerted on a section of the rear wall 30 delimiting the receiving space 60. This is indicated in Fig. 3 by a thick arrow 56. Due to the pressure on the portion of the rear wall 30 delimiting the receiving space 60, there is a force transmission to the lumpy filling material 62, which in turn exerts pressure on a portion of the front wall 20 which delimits the receiving space 60. Since the material weakening formation 70 is formed in the central region 80 of the portion of the front wall 20 delimiting the receiving space 60, bursts as soon as the strength limit of the center weakened by the material weakening formation 70 is reached. central area 80, the front wall 20 in the area of the pressure-loaded receiving space 60. The lumpy filling material 62 is thus accessible.

In Fig. 4 it is shown how such a pressure, which leads to a rupture of the opening space arrangement delimiting the receiving space 60 of the push-through packaging 100, can also be exerted, for example, with a thumb from above onto the receiving space 60, so that the push-through packaging 100 lumpy filling material 62 in turn releases.

FIG. 5A shows an exemplary embodiment of the polymer layer arrangement 22 in the form of the opening layer arrangement 24 of the front wall 20 of the push-through package 100. This opening layer arrangement 24 has a biaxially oriented polyolefin film 32 as a strength-determining layer, preferably as a biaxially oriented polypropylene film 32. This BOPP film 32, which can also be an OPE film, has a thickness of 10 to 60 mm, preferably 20 to 40 pm on. It provides the essential barrier effect against the passage of oxygen and water vapor through the front wall 20. On its side pointing to the consumer, the biaxially oriented polyolefin film 32 is provided with a printing order layer 34 in the straight printing process. This print job layer 34 can have a plurality of printing inks in order to produce a multicolored printing image.

On its side facing the receiving space 60 or the rear wall 30, a non-oriented polyolefin layer 36 is applied to the biaxially oriented polyolefin film 32 in the extrusion process. This extruded polyolefin layer 36 can be formed from PE, PP or / and COC, either as a monolayer, as a non-oriented polyolefin layer 36 with several coextruded layers or as a blend, the blend being both a monolayer and one or more of the called coextruded layers can be applied.

In particular, the use of COC forms a good barrier against the passage of oxygen and water vapor through the opening layer arrangement 24, which complements the barrier effect of the biaxially oriented polyolefin film 32. One from COC formed or COC comprising polyolefin layer 36 can also be used as a heat seal layer for connection to the rear wall 30.

FIG. 5A shows how the material weakening formation 70 is formed only in the area of the biaxially oriented polyolefin film 32, namely as perforation openings 72 penetrating the polyolefin film 32 at regular intervals.

The perforation openings 72, which completely penetrate the biaxially oriented polyolefin film 32 in the thickness direction, would in principle be suitable for significantly reducing the barrier effect of the polyolefin film 32, which is particularly undesirable in the area of the receiving space 60, where the packaged packaged product 62 is located is.

However, by extrusion coating the polyolefin material of the non-oriented polyolefin layer 36, it is possible to fill the perforation openings 72 of the material weakening formation 70 at least partially or even completely with the extrudate when the layer 36 is formed. Thus, at least part of the inevitable reduction in the barrier effect of the polyolefin film 32 due to the formation of the material weakening formation 70 can be compensated for again.

The opening layer arrangement 24 and also the polymer layer arrangement 26, not shown, of the rear wall 30 each consist of at least 95% by weight, preferably at least 98% by weight, of polyolefin, that is to say from one or more polymers of one and the same polymer family. As a result, for example, the poly olefin film 32 and the polyolefin layer 36 can be applied directly to one another without the interposition of adhesion promoters and the like.

The polymer layer arrangement 26 of the rear wall 30 can have the same layer structure as the opening layer arrangement 24, with generally only one of the polymer layer arrangements 22 and 26 having a material weakening formation 70. However, it should not be excluded that the polymer layer arrangement tion 26 of the rear wall 30 also has a material weakening formation 70 beyond the identical layer structure.

With the non-oriented polyolefin layer 36, the opening layer arrangement 24 can be connected to a further polymer layer arrangement, which also has an external polyolefin fleece seal layer, by means of fleece sealing to form the joining area 52 to form a push-through packaging 100.

FIG. 5B shows an alternative embodiment of an opening position arrangement 124. The same and functionally identical components and sections as in FIG. 5A are provided with the same reference numerals in FIG. 5B, but increased by the number 100.

While the material weakening formation 70 cannot be seen from the outside in FIG. 5A, since the composite of polyolefin film 32 and polyolefin layer 36 was only provided with the print application layer 34 after it had been formed by the straight printing process, the biaxially oriented polyolefin film 132 of the opening layer arrangement 124 from FIG. 5B is in the reverse printing process provided with a print job layer 134.

Since the biaxially oriented polyolefin film 132 of FIG. 5B, which was printed in reverse printing, was only provided with the material weakening formation 170 after it had been printed in the counter printing process, the perforation openings 172 of the opening layer arrangement 124 not only penetrate the oriented polyolefin film 132, but also the print application layer 134 and one on top of it from the polyolefin film 132 send away side of the print application layer 134 applied primer layer 137, which is necessary to connect the non-oriented polyolefin layer 136 with the polyolefin film 132 printed in reverse printing on the printed side thereof.

The non-oriented polyolefin layer 136 is in turn applied to the polyolefin film 132 in the extrusion process. In contrast to the illustration in FIG. 5B, it can, as in the embodiment in FIG. 5A, have an external heat-sealable one Form polyolefin sheet. The same applies to the non-oriented polyolefin layer 36 for the polyolefin layer 136 in FIG. 5B.

A further polyolefin film 138 is shown in FIG. 5B only on the side of the non-oriented polyolefin sheet 136 facing away from the polyolefin film 132, in order to illustrate yet another modification. The non-oriented polyolefin film 136 can thus also serve as a lamination adhesive layer in order to permanently connect the polyolefin film 132 to the further polyolefin film 138.

As the external heat-sealable layer, the polyolefin layers 36 and 136 preferably have a thickness in the range from 10 to 100 μm, preferably from 40 to 60 μm.

As a laminating adhesive layer, the polyolefin layer 136 has a thickness of 5 to 80 μm, preferably of 15 to 30 μm.

If the polyolefin layer 136 is a laminating adhesive layer, this is generally formed from a polyolefin, that is to say PP or PE as a monolayer. The further polyolefin information 138 can then in turn be a layer made of polyethylene or / and polypropylene or / and COC, again as a monolayer or as a multilayer coextruded polyolefin film, the materials mentioned being able to be used as a blend or purely coextruded or as a monofilm.

The adhesive-laminated further polyolefin film 138 can then again serve as a heat-sealing gel film or can be connected to the rear wall by using further adhesives.

The opening layer arrangement 124 also consists of at least 95% by weight, preferably at least 98% by weight, of one or more polymers from the same family of polymers, preferably the family of polyolefins. This considerably facilitates the reusability of the polymer layer arrangement 124. The push-through packaging 100 and thus both the front wall and the rear wall or the polymer layer arrangements 22 and 26 forming them are not only formed to at least 95% by weight from one or more polymers of the same polymer family, but are also free of metal layers and metals - Layers and free of chlorinated polymers such as PVC and PVDC. This also considerably facilitates the recycling of the used push-through packaging 100.

At this point, it should be pointed out that all the parts described above are seen on their own and in any combination, in particular the details shown in the drawings, are claimed as essential to the invention. Modifications to this are familiar to the person skilled in the art.

Claims

Expectations

1. push-through packaging (100) with a front wall (20) and a rear wall (30), which are connected to one another with the inclusion of a receiving space (60) between them, a joining area (52) in which the front wall (20) and the rear wall (30) is connected to one another, completely surrounds the receiving space (60), the front wall (20) and the rear wall (30) each being formed from a polymer layer arrangement (22, 26), at least one polymer layer arrangement (22, 26) as an opening layer arrangement (24; 124) in the area of extension of the receiving space (60) which reduces the tear or / and bursting strength of the opening layer arrangement (24; 124) compared to an identically constructed, but non-weakened polymer layer arrangement (22, 26) Material weakening formation (70; 170), wherein the opening position arrangement (24; 124) has a non-weakened area (90) surrounding the material weakening formation (70; 170) in which the opening position arrangement (24; 124) is free from material weaknesses, and wherein the front wall (20) and the rear wall (30) taken together are formed to more than 95% by weight from polymer layers (32, 36; 132, 136, 138) of the same family of polymers.

2. Packaging (100) according to claim 1,

characterized in that both the front wall (20) and the rear wall (30), taken on their own, are formed to more than 95% by weight from polymer layers (32, 36; 132, 136, 138) of the same polymer family.

3. Packaging (100) according to claim 1 or 2,

characterized in that the polymer family is the family of polyols fine.

4. Packaging (100) according to any one of the preceding claims, characterized in that the polymer layer arrangement (22, 26) of the front wall (20) and / or the rear wall (30) has an oriented polymer film (32; 132).

5. packaging (100) according to claim 4,

characterized in that the oriented polymer film (32; 132) is a biaxially oriented polymer film (32; 132).

6. Packaging (100) according to one of claims 4 or 5,

characterized in that the oriented polymer film (32; 132) has a face-to-face printing process and / or a counter-printing process (34; 134).

7. Packaging (100) according to one of claims 4 to 6,

characterized in that the opening layer arrangement (24; 124) has an oriented polymer film (32; 132), the oriented polymer film (32; 132) having the material weakening formation (70; 170).

8. Packaging (100) according to one of the preceding claims,

characterized in that the polymer layer arrangement (22, 26) of the front wall (20) and / or the rear wall (30) has a non-oriented polymer layer (36; 136).

9. packaging (100) according to claim 8,

characterized in that the non-oriented polymer layer (36; 136) is applied by extrusion coating.

10. packaging (100) according to one of claims 8 or 9,

characterized in that the opening layer arrangement (24; 124) has a non-oriented polymer layer (36; 136), the non-oriented Polymer layer (36; 136) in the area of the receiving space (60) is free of material weakenings.

11. Packaging (100) according to one of claims 8 to 10,

characterized in that material of the non-oriented polymer layer (36; 136) protrudes into the material weakening formation (70; 170) and the material weakening formation (70; 170) at least partially, preferably completely, fills up.

12. Packaging (100) according to one of the preceding claims,

characterized in that the opening position arrangement (24; 124) has a water vapor transmission rate of no more than 0.7 g / m ² , preferably no more than 0.5 g / m ² , more preferably no more than 0.25 g / m ² , most preferably not more than 0.15 g / m ² , measured according to ASTM F1249 at 38 ° C and 90% relative humidity.

13. Packaging (100) according to one of the preceding claims,

characterized in that the opening layer arrangement (24; 124) has an oxygen transmission rate of no more than 1 cm ³ / m ² , preferably no more than 0.7 cm ³ / m ² , more preferably no more than 0.6 cm ³ / m ² , most preferably not more than 0.4 cm ³ / m ² , measured according to ASTM D3985 at 23 ° C and 50% relative humidity.

14. Packaging (100) according to one of the preceding claims,

characterized in that the polymer layer arrangements (22, 26) of the front wall (20) and the rear wall (30) have an identical layer structure.

15. Packaging (100) according to one of the preceding claims,

characterized in that the polymer layer arrangements (22, 26) both the front wall (20) and the rear wall (30) each have a tear or / and burst strength in comparison to an identically constructed, but have weakened polymer layer arrangement (22, 26) reducing material weakening formation (70; 170), each of the polymer layer arrangement (22, 26) having a closed around the material weakening formation (70; 170) ge surrounding un weakened area (90) in which the respective Polymer layer arrangement (22, 26) is free of material weaknesses.

16. Packaging (100) according to any one of the preceding claims, including claim 9,

characterized in that the non-oriented polymer layer (136) is arranged as an extrusion lamination layer (136) between the oriented polymer film (132) and a further polymer film (138) for producing a lamination connection of the oriented polymer film (132) with the further polymer film (138) is.

17. Packaging (100) according to one of the preceding claims,

characterized in that the polyolefin is polypropylene.

18. Packaging (100) according to one of the preceding claims,

characterized in that it has a plurality of receiving spaces (60), each with a material weakening formation (70; 170) and one surrounding the non-weakened area (90), preferably between adjacent non-weakened areas (90) both in the front wall (20) as well as in the rear wall (30) of the material weakening formations (70; 170) of the receiving spaces (60) different separating material weakenings (54) are provided, which at the place of their formation, compared to an otherwise similar push-through packaging (100) without separating Material weaknesses (54) reduce the tear strength of the blister pack (100).

19. Polymer layer arrangement (22, 26) for forming a front wall (20) or a rear wall (30) of a push-through packaging (100) according to one of the preceding claims, wherein the polymer layer arrangement (22, 26) is a Tear or / and the burst strength of the polymer layer arrangement (22, 26) in comparison to an identically constructed, but non-weakened polymer layer arrangement (22, 26) reducing material weakening formation (70; 170), the polymer layer arrangement (22, 26) by one Material weakening formation (70; 170) has a closed circumferential, non-weakened area (90) in which the polymer layer arrangement (22, 26) is free from material weakening, the polymer layer arrangement (22, 26) being composed of more than 95% by weight of polymer layers 32, 36; 132, 136, 138) of the same polymer family are formed, the polymer layer arrangement (22, 26) having an oriented polymer film (32; 132) which has the material weakening formation (70; 170) and a polymer layer which is not oriented by material weakening ( 36; 136), the material of the non-oriented polymer layer (36; 136) protruding into the material weakening formation (70; 170) and the material weakening formation (70; 170) less at least partially, preferably completely.