DE102022133751B3 - Collective packaging with a high barrier, containing a plurality of individual packaging with a low barrier - Google Patents

Abstract

A thermally sterilizable packaging system (10) comprises an outer collective packaging (12) which surrounds an outer packaging space (14) in which at least two inner individual packages (16) are accommodated. The collective packaging (12) is formed from a first packaging layer material (18), which comprises at least one polymer layer (44, 48, 52, 54, 56). The individual packaging (16) is formed from a second packaging material (60) that is different from the first, with a packaging material (18, 60) made of first and second packaging material as a high-barrier packaging material having an oxygen permeability of less than 0.5 cm3/(m2 d bar) and a water vapor permeability of less than 0.5 g/(m2 d), and wherein the other packaging material (18, 60) as a low-barrier packaging material has an oxygen permeability of more than 3 cm3/(m2 d bar) and has a water vapor permeability of more than 2 g/(m2 d). According to the invention, the first packaging material (18) has at least two polymer layers (44, 48, 52, 54, 56) and is a high-barrier packaging material, and in that the second packaging material (60) is a packaging layer material (60) with at least one polymer layer (62, 64, 66, 68) and is the low-barrier packaging material.

Description

Thermally sterilizable packaging system, comprising an outer collective packaging which surrounds an outer packaging space in which at least two inner individual packagings are accommodated, each individual packaging surrounding an inner packaging space and being designed to package a product, the collective packaging being formed from a first packaging material, which comprises at least one polymer layer as packaging layer material, and wherein the individual packaging is formed from a second packaging material that is different from the first, wherein a packaging material made of first and second packaging material as a high-barrier packaging material has an oxygen permeability of less than 0.5 cm ³ /(m ² ·d· bar), determined according to DIN 53380-3 at 23°C and 85% relative humidity, and a water vapor permeability of less than 0.5 g/(m ² ·d), determined according to ISO 15106-2 at 23°C and 85% relative humidity, and wherein the other packaging material made of the first and second packaging material as a low-barrier packaging material has an oxygen permeability of more than 3, preferably more than 5 cm ³ / (m ² d bar), determined according to DIN 53380-3 at 23°C and 85% relative humidity, and a water vapor permeability of more than 2 g/(m ² ·d), determined according to ISO 15106-2 at 23°C and 85% relative humidity.

The present invention has as its starting point a shrink-wrapped film packaging as collective packaging, which combines several metal cans, such as tinplate cans, as individual packaging into one container. Such prior art metal cans are the above-mentioned high-barrier packaging material and have high-barrier properties against the passage of water vapor and oxygen. They are therefore suitable for packaging food, especially canned food, with a long shelf life.

Since the metal cans as the second packaging material already have high-barrier properties, the first packaging material does not require any special barrier properties and can be designed as the low-barrier packaging material as a cost-effective thermoplastic shrink-wrapped polymer film.

The packaging system of the present invention, like the multiple cans shrink-wrapped in foil, should preferably also relate to foodstuffs and in particular canned foodstuffs as products packaged in the individual packaging, although other products packaged in the individual packaging as canned foodstuffs or as foodstuffs generally should not be excluded.

Another advantage of the metal cans mentioned, in addition to their very good barrier properties in terms of low oxygen and water vapor transfer rates, is their excellent thermal sterilizability. Metal cans can easily withstand high temperatures of more than 120 °C, such as those achieved in the sterilization of food packaging, for example in retort sterilization with superheated steam, which is common in this field.

One disadvantage of metal cans, however, is their relatively large weight. As the packaged portion sizes become smaller, this own weight takes up an increasingly larger proportion of the total weight of the package containing the packaged goods. Since packaged goods always have to be transported at least from the producer to the point of sale, the high tare value causes a deterioration in the CO ₂ transport balance of the packaged product. Since transport capacities are usually weight-limited, exhausting the transport capacity with a high proportion of packaging weight means a disadvantageously low utilization rate of the transport capacity with regard to the transported product.

Furthermore, it is relatively complex to permanently attach consumer information about origin, contents, weight, shelf life and the like to the outside of metal cans.

The object of the present invention is therefore to further develop the thermally sterilizable packaging system of the type mentioned at the outset with continued good barrier properties against migration of oxygen and water vapor (moisture) in such a way that, with the same total weight of packaging weight and packaged goods, the proportion of the packaging weight in the total weight is lower. Then, for a given transport weight, a larger proportion of products can be transported by weight. The CO ₂ footprint of the product, based on the weight of the packaged product, is therefore reduced.

Film packaging systems with a packaging bag as collective packaging and with individual packaging contained therein are also known in the prior art, for example for sweets in a reduced size compared to their usual retail presentation form, for example so-called “minis”. The individual candy itself is typically packaged in a flowpack made of packaging film as the second packaging layer material. Lots of packaged sweets are repackaged in a packaging bag or in another flow pack made of packaging film. While the packaging of individual sweets is generally opaque, the collective packaging as outer packaging is at least partially transparent. However, such packaging systems do not have any special barrier properties with regard to the migration of oxygen and water vapor through the packaging material. If at all, the individual packaging that can be removed from the collective packaging has metallization, which, in addition to aesthetic effects, also offers a barrier effect.

However, the packaging films used for the individual packaging mentioned are not suitable for thermal sterilization. Thermal sterilization, such as the above-mentioned retort sterilization, is carried out using superheated steam, whereby the packaging with its packaged product must withstand temperatures of over 120 ° C for a long period of time without changing its structure, shape and function. If an individual packaging of the above-mentioned film packaging system has special barrier properties due to a packaging material layer made of known barrier materials, these are greatly reduced or even eliminated by thermal sterilization. If the barrier properties are based, for example, on a metallization of a polymer layer, this will be damaged by the increase in temperature, because the usually axially oriented carrier layer of the metallization shrinks during the strong heating and also imposes its shrinkage deformation on the metallization it supports. If a barrier property is based on vinyl alcohol polymers, such as EVOH or PVOH, the integrity of these moisture-sensitive materials is threatened by the moisture introduced by the superheated steam.

According to the invention, the present invention solves the underlying problem by a packaging system of the type mentioned at the outset, in which the first packaging material has at least two polymer layers and the high-barrier packaging material, and in which the second packaging material is a packaging layer material with at least one polymer layer and the low-barrier packaging material is.

The packaging system according to the invention uses packaging layer materials with one or more polymer layers for both the collective packaging and the individual packaging. The weight of at least the individual packaging is significantly reduced compared to the known metal cans with the same packaged product weight per individual packaging. This means that the weight share of the packaging in the total weight of the packaged product is reduced in the desired manner.

Preferably, the first packaging layer material comprises at least three polymer layers. One of these is preferably a sealable inner layer, another is a carrier polymer layer which carries a barrier layer made of preferably metal or a metallization or metal oxide, and a polymer layer forms an outer layer that is exposed to the outside. The barrier effect can be achieved by a vinyl alcohol polymer layer as an alternative or in addition to the mentioned metallization or metal oxide layer. The number of polymer layers can be increased by adding adhesive layers for adhesion or extrusion lamination.

Also preferably, the second packaging layer material may comprise two or more polymer layers. Again, one of them preferably forms a sealable inner layer and another forms an outer layer. A vinyl alcohol polymer layer can be arranged in between as an at least temporary oxygen barrier layer. Here too, the number of polymer layers can be increased by adhesive layers for adhesion or extrusion lamination.

For reasons of weight saving, at least one polymer layer of the first and/or the second packaging layer material can comprise foamed polymer.

It is advantageously possible to design the individual packaging from the second packaging layer material not only cost-effectively but also thermally sterilizable, because the second packaging layer material can be designed to be robust as a low-barrier packaging material with regard to the thermal load during sterilization, in particular during retort sterilization. The second packaging layer material does not require increased barrier properties against migration of oxygen and water vapor through the second packaging layer material, which can generally only be achieved by selecting load-sensitive materials in generally load-sensitive layer thicknesses. Therefore, every individual packaging can be thermally sterilized without fear of any loss of function, shape or structure of the individual packaging or its packaging material.

The initially apparent disadvantage of a lack of an increased barrier against migration of oxygen and water vapor on the individual packaging can be compensated for by the collective packaging, which has exactly that barrier properties. For this purpose, the collective packaging is formed from the first packaging layer material, which is the high-barrier packaging material.

Oxygen on perishable products allows them to oxidize. Water vapor, i.e. moisture, on products promotes their softening. The latter occurs to an even greater extent if the product reached by moisture contains salts and is therefore hygrophilic to a certain extent.

Thus, the collective packaging, which is particularly easily perceived by the consumer as the external packaging of the packaging system discussed here, can be formed with a high-barrier packaging material. Its sensitivity to elevated temperatures is not affected because the collective packaging does not have to be exposed to any increase in temperature. For this reason, it can also be provided with consumer information, which is visible on the outside presented at the point of sale. It is completely unproblematic to apply a printing ink to a packaging layer material, even if it comprises layers with a particularly low oxygen and/or water vapor permeability as a high-barrier packaging material, whereby “black” is also understood to be a printing ink in this context.

In summary, the collective packaging has the required barrier properties but is not thermally sterilized, while the individual packaging can be thermally sterilized but does not have any barrier properties. However, the overall packaging system arranged around the products packaged in the individual packaging provides both the required barrier properties and the required thermal sterilizability.

The packaged product may be any product, but is preferably a food product, most preferably a canned food product, such as pre-cooked vegetables, pre-cooked meat and the like. The product can be a pourable or a lumpy product. The term “individual packaging” simply indicates that such a designated packaging can be separated from the majority of individual packaging and removed from the collective packaging. The term does not indicate that individual packaging should only be used to package a single product, in the sense of a single piece.

An individual packaging is considered thermally sterilizable within the meaning of the present application if it has a temperature of at least 120 ° C, but not more than 131 ° C, for at least 10 minutes, preferably for 120 minutes, without changes in its size or its function or the Structure of your packaging layer material survives.

The packaging system described here is used to pack several portions, so that after opening the collective packaging, not all of the individual packaging packed in it is usually consumed. In order to be able to bring the remaining individual packaging back into the barrier protection provided by the collective packaging after the collective packaging has been opened, the collective packaging can have a closure device for re-closing a removal opening. The removal opening can be recognized as a target opening point on the collective packaging even in its closed state after it has been filled by the manufacturer, be it by visually identifying a tear or cut line, be it through intended weakenings in the packaging layer material to guide a crack that has once been initiated, or be it through others Measures.

As was already shown at the beginning, permeabilities of a packaging layer material with respect to oxygen and water vapor are given as transfer rates. Experts use the abbreviation “OTR” for the English term “Oxygen Transfer Rate” to designate the oxygen transfer rate and the abbreviation “WVTR” for the English term “Water Vapor Transfer Rate” to designate the water vapor transfer rate.

According to a first preferred embodiment of the present invention, the closure device can comprise a positive locking device, which is known in the art under the term “zipper”. This is a form-fitting device which has a closure strip running along the removal opening on each side of the removal opening. For efficient re-closing of the removal opening, the closure strips preferably extend over the entire length of the removal opening.

One of the closure strips has a male form-fitting formation running in the longitudinal direction of the one closure strip along the removal opening. The other of the closure strips has a female form-fitting formation running in the longitudinal direction of the other closure strip along the removal opening. The female form-fitting formation is designed to positively accommodate the male form-fitting formation. To avoid a weakening caused by the removal opening In order to be able to at least partially compensate for the barrier properties of the collective packaging, each of the closure strips is preferably at least partially formed from a vinyl alcohol polymer. Possible vinyl alcohol polymers are ethylene-vinyl alcohol copolymer (EVOH) and polyvinyl alcohol (PVOH), both of which have advantageously low oxygen transfer rates.

In order to provide at least one of the closure strips, preferably both closure strips, with increased mechanical stability compared to being made exclusively from a vinyl alcohol polymer and/or to at least one of the two closure strips, preferably both closure strips, in addition to a low oxygen transfer rate, also the lowest possible water vapor transfer rate At least one of the closure strips can have a core strip made of a polymer material that deviates from the vinyl alcohol polymer and extends over at least 70% of its longitudinal dimension. The core strip preferably extends over 90% of the longitudinal dimension of the closure strip, particularly preferably over 100% of the longitudinal dimension of the closure strip. It is particularly preferred that both closure strips are initially produced as quasi-endless extrusion profiles and cut to the required length. The core strip can carry a barrier formation made of the vinyl alcohol polymer at least in a section over at least 90%, particularly preferably over 100%, of its longitudinal dimension. Other portions of the core bar may be free of the vinyl alcohol polymer. Both closure strips are preferably designed in the manner mentioned.

The material of the core strip is preferably a thermoplastic polymer. The material is preferably a polyamide. However, it may also include or be a polyester, such as polyethylene terephthalate. For the same layer thickness of a test material sheet, polyamide offers a higher water vapor barrier, i.e. a lower water vapor transfer rate, than, for example, polyethylene or polypropylene. In the combination of polyamide and the vinyl alcohol polymer, a closure strip with overall good barrier effects against migration of both oxygen and water vapor through the closure strip can be provided with a small strip volume.

Then, if each closure strip is designed according to the above description and has a core strip, in order to achieve a high barrier effect after re-closing the once-opened collective packaging, it is preferably provided that in the closed state of the positive locking device, when the male and female positive locking formations are in positive engagement with one another , the barrier formations of the two closure strips are in contact with one another over at least 80%, preferably over at least 95%, of the engagement length of the positive locking formations.

In the circumferential direction around the closure strip, the barrier formation at least partially surrounds the core strip, so that the core strip can be exposed in sections. An exposed section of the core strip preferably forms the positive locking formation. However, it should not be ruled out that the barrier formation completely surrounds the core strip in the circumferential direction. Then the positive locking formation is also formed from the material of the barrier formation.

Preferably, at least one form-fitting formation, particularly preferably both form-fitting formations of the closure strips involved, are formed from the polymer foreign to the vinyl alcohol polymer, i.e. in particular from polyamide or polyethylene terephthalate, in order to provide the form-fitting formations and thus the form-fitting engagement formed between them with increased stability and increased strength to lend. The two form-fitting formations, one of which forms a projection when viewed in a cross-sectional area orthogonal to the longitudinal direction of the closure strips, which engages in a recess of the other form-fitting formation, can thus form a water vapor barrier that is continuous across the removal opening, with a barrier between the projection and the recess formed labyrinth seal.

In addition to the form-fitting formations, the barrier formations can be made of vinyl alcohol polymer with appropriate dimensions so that they touch each other when the closure device is closed and also form an oxygen barrier that is disturbed as little as possible across the removal opening.

In the usual way, a form-fitting engagement between the form-fitting devices of the closure strips can be produced manually by the respective user by locally establishing a form-fitting connection at one end of the removal opening, further manually exerting pressure on the form-locking devices towards one another and by moving their pressure-exerting fingers along the closure strips can slide towards the other longitudinal end of the removal opening.

For a more convenient production of the positive locking engagement, the positive locking device can comprise a sliding slide that can be moved along the closure strips as an actuation aid for actuating the positive locking device. Such Closure device comprising a “zipper” with a sliding slide is also referred to in the professional world as a “slider”.

The sliding slide preferably encompasses the closure strips and, when moved in a direction along the longitudinal dimension of the closure strips, at least supports the production of a positive engagement between the male and the female positive locking formation or completely ensures the production of the positive engagement. When moving in the opposite direction, the sliding slide at least supports the cancellation of a positive engagement between the male and female positive locking formations or causes it to occur completely.

In addition or as an alternative to the above-mentioned “zipper” or “slider” configurations, the closure device can have an adhesive zone with a cold adhesive to achieve the tightest possible re-closure. The cold adhesive is preferably a known pressure-sensitive adhesive, which adheres to every surface section of the collective packaging with its free, sticky surface. The cold adhesive is therefore preferably arranged on a surface of a packaging wall section of the collective packaging for bonding to another packaging wall section of the collective packaging. The adhesive zone preferably forms an adhesive strip which extends over at least 75%, preferably over at least 90%, particularly preferably over 100% or more of the longitudinal dimension of the removal opening in order to enable the removal opening to be re-closed as extensively as possible, preferably completely.

The collective packaging is preferably designed as a collective packaging bag, since bag packaging can generally have a large packaging space relative to its own weight. As a collective packaging bag, the collective packaging has a front packaging wall and a rear packaging wall. This is not intended to exclude the possibility that the collective packaging also has side walls, although side walls are not absolutely necessary. For example, the collective packaging bag can be designed as a three- or four-edge sealed bag or as a flow pack. In the latter case of a flow pack, the rear packaging wall will have a longitudinal sealing seam.

1. i.) auf einer zur jeweils anderen Verpackungswand bzw. zum äußeren Verpackungsraum hinweisenden Innenseite einer Verpackungswand aus vorderer und hinterer Verpackungswand zur adhäsiven Verbindung mit der Innenseite der jeweils anderen Verpackungswand oder/und
2. ii.) auf einer von der jeweils anderen Verpackungswand bzw. vom äußeren Verpackungsraum wegweisenden Außenseite einer Verpackungswand aus vorderer und hinterer Verpackungswand zur adhäsiven Verbindung mit der Außenseite der jeweils anderen Verpackungswand.

Regardless of the specific structural design of the collective packaging bag, the outer packaging space is located between the front and rear packaging walls. According to preferred embodiments, the cold adhesive zone can then be arranged on the collective packaging bag as follows:

1. i.) on an inside of a packaging wall made up of front and rear packaging walls facing the other packaging wall or the outer packaging space for adhesive connection to the inside of the other packaging wall or/and
2. ii.) on an outside of a packaging wall consisting of front and rear packaging walls facing away from the other packaging wall or from the outer packaging space for adhesive connection to the outside of the other packaging wall.

Option i.) simply allows the removal opening to be reclosed by connecting the facing inner sides of the front and rear packaging walls. The reclosure formed in this way is peelable and can be opened and closed again as often as desired.

Option ii.), which can be provided in addition to or as an alternative to option i.), enables the collective packaging bag to be rolled up from the end region carrying the removal opening over the removal opening, so that it is opposite in the roll of material, for example in the manner of a labyrinth seal shielded from the outside environment. To fix the roll of material against renewed unrolling or partial opening driven by the inevitable material elasticity of the packaging materials, an adhesive connection of an outside of the front or rear packaging wall to an outside of the other packaging wall consisting of the front and rear packaging walls is achieved here using the cold adhesive zone.

In order to be able to at least roughly remove unwanted oxygen components from the outer packaging space after individual individual packaging has been removed from the collective packaging and after resealing, according to a preferred development of the invention, a valve can be arranged in a wall section of the collective packaging, through which gas from the external Packaging space can flow into the external environment of the collective packaging, but not in the opposite direction. Then, after re-closing the collective packaging, air that has entered the outer packaging space can be pushed out into the outer packaging space by the valve, which only acts in one direction, namely out of the outer packaging space. With the escape of air from the outside Packaging space through the valve also allows moisture contained in the air to escape.

Additionally or alternatively, the collective packaging can have at least one absorber consisting of an oxygen absorber and a moisture absorber in order to keep the oxygen and moisture content in the outer packaging space as low as possible. Oxygen absorbers and moisture absorbers are basically known in packaging technology.

In a simple embodiment, the oxygen absorber and/or the moisture absorber can be placed in their own absorber packs in the outer packaging space, as is known for silica gel cushions as a drying agent. In order to have to sacrifice as little volume of the outer packaging space as possible to accommodate absorbers, according to a preferred embodiment, at least one absorber made up of the oxygen absorber and the moisture absorber can be pressure-activated and integrated into a polymer layer that is exposed towards the outer packaging space. Both absorbers are preferably integrated in a pressure-activated manner in the manner mentioned. For example, the absorbers can be encapsulated in the exposed polymer layer in microcapsules that are fragile under a predetermined pressure load. By brushing over the area doped with microcapsules, for example with the back of a knife or a fingernail, the bursting strength of the microcapsules can be locally exceeded by the pressure generated and the originally encapsulated absorber can be released and activated.

Then, if an adhesive zone described above is formed on the collective packaging, on which pressure must also be exerted locally in order to adhesively connect two surface sections of different wall sections of the collective packaging bag to one another, the pressure exerted to connect and thus re-close the removal opening can advantageously also be used Activation of the at least one absorber can be used if an absorption zone of the collective packaging formed by incorporating at least one pressure-activated absorber from the oxygen absorber and the moisture absorber into the polymer layer exposed to the outer packaging space overlaps with the adhesive zone.

In addition, the collective packaging can be designed to generate and/or maintain a gas composition that deviates from the normal atmosphere in the outer packaging space even after opening and reclosing. For example, it can be provided that an activatable gas source with an at least oxygen-reduced gas is accommodated in the outer packaging space of the collective packaging. The activatable gas source can be a breakable container, which either contains gas directly or a substance that passes into the gas phase after the container has broken, possibly several substances which, originally separated, enter into a mixture when the container is broken, the mixture entering the Gas phase passes.

In turn, the container can be formed by a plurality of microcapsules, which, in addition to or as an alternative to the absorber microcapsules, are accommodated in a polymer layer of the first packaging layer material of the collective packaging that is exposed towards the outer packaging space. Although the protective gas atmosphere that can be achieved with microcapsules, for example with an atmosphere with an increased content of N ₂ or CO ₂ , is less pronounced than the protective gas atmosphere that can be achieved with a fragile container, less is still better than nothing. In this context, the quasi-inert gases mentioned as examples, nitrogen and carbon dioxide, are referred to as protective gases, which, in the absence of external energy sources, do not normally form compounds with other chemical elements.

To provide the high barrier properties mentioned at the outset, the first packaging layer material can have a metallization layer and/or a metal oxide layer and/or a vinyl alcohol-containing polymer layer as a barrier layer to reduce migration of oxygen and/or moisture through the first packaging layer material. The metallization layer can be physically or chemically deposited from the vapor phase onto a surface of a carrier polymer layer according to a method known per se. The same applies to the metal oxide layer. The metallization can be made of any metal. The metallization is preferably made of aluminum or an aluminum alloy. Suitable materials for the metal oxide layer are, in particular, silicon oxide with the structural designation SiO _x and aluminum oxide with the structural designation Al _u O _v , where x, u and v are integers. The best known aluminum-based metal oxide barrier material is Al ₂ O ₃ .

Carrier polymer layers for vapor deposition or vapor deposition of metal or metal oxide layers thereon are preferably formed from oriented polymer, particularly preferably from biaxially oriented polymer. Polypropylene is particularly suitable for biaxial orientation.

The EVOH and PVOH mentioned above can be considered as vinyl alcohol polymers with a barrier effect.

In order to facilitate recycling of the collective packaging after use, the first packaging layer material is preferably formed of at least 90% by weight, preferably at least 95% by weight, of polymer of one and the same monomer. Then the first packaging layer material can be recycled in a monomaterial recycling stream. This material is preferably a polyolefin, particularly preferably polypropylene. However, it should not be ruled out that the collective packaging is formed from a packaging layer material with different varieties of polyethylene and consists of at least 90% by weight, preferably at least 95% by weight, of polyethylene.

For the same reason, the second packaging layer material can additionally or alternatively be formed from polymer of one and the same monomer to the extent of at least 90% by weight, preferably at least 95% by weight. Since at least the last individual packaging removed and the collective packaging that is then no longer required are often disposed of together, the first and second packaging layer materials are preferably made of at least 90% by weight, preferably at least 95% by weight, of the same polymer.

1. a.) eine Lage aus biaxial orientiertem Polypropylen mit einer Dicke von zwischen 15 und 30 µm, bevorzugt von zwischen 17 und 23 µm, besonders bevorzugt von 20 µm,
2. b.) eine Lage Druckfarbenauftrags im Konterdruck, nach außen geschützt durch die Lage a.),
3. c.) eine Haftmittellage entweder aus Kaschierkleber, beispielsweise auf Polyurethan-Basis, mit einem Flächengewicht von zwischen 2 und 5 g/m², bevorzugt von zwischen 3 und 4 g/m², besonders bevorzugt von 3,5 g/m², oder als Extrusionskaschierlage aus Polypropylen mit einem Flächengewicht von zwischen 12 und 20 g/m², bevorzugt von zwischen 13 und 17 g/m², besonders bevorzugt von 15 g/m²,
4. d.) eine optionale Primerlage, falls die Lage c.) die Extrusionskaschierlage aus Polypropylen ist,
5. e.) eine Metallisierungslage aus Aluminium oder eine Metalloxidlage aus SiO_x oder Al_uO_v, wobei x, u und v ganze Zahlen sind, getragen von
6. f.) einer Trägerpolymerlage aus biaxial orientiertem Polypropylen mit einer Dicke von zwischen 15 und 25 µm, bevorzugt von zwischen 16 und 20 µm, besonders bevorzugt von 18 µm,
7. g.) eine Haftmittellage analog zur Haftmittellage c.) mit identischen Material- und Flächengewichtsbereichen, jedoch mit der Maßgabe das das besonders bevorzugte Flächengewicht im Falle der Ausbildung einer Kaschierkleberlage 3,0 g/m² beträgt, und
8. h.) eine Polypropylen-Lage, bevorzugt aus Cast- oder Blown-Polypropylen. Bevorzugt ist die Lage h.) mit Farbpigmenten versehen, besonders bevorzugt mit weißen Farbpigmenten. Die Dicke der Lage h.) beträgt bevorzugt zwischen 40 und 100 µm, besonders bevorzugt zwischen 50 und 70 µm, noch stärker bevorzugt 60 µm. Die Lage h.) kann aus mehreren Teilschichten coextrudiert sein. Insbesondere kann die Lage h.) an ihrer freiliegenden Oberfläche aus siegelfähigem Polypropylen gebildet sein.

The first packaging layer material can, for example, have the following structure from the outside to the inside, i.e. towards the outer packaging space:

1. a.) a layer of biaxially oriented polypropylene with a thickness of between 15 and 30 µm, preferably between 17 and 23 µm, particularly preferably 20 µm,
2. b.) a layer of printing ink application in reverse printing, protected from the outside by layer a.),
3. c.) an adhesive layer either made of laminating adhesive, for example based on polyurethane, with a basis weight of between 2 and 5 g/m ² , preferably between 3 and 4 g/m ² , particularly preferably of 3.5 g/m ² , or as an extrusion laminating layer made of polypropylene with a basis weight of between 12 and 20 g/m ² , preferably between 13 and 17 g/m ² , particularly preferably of 15 g/m ² ,
4. d.) an optional primer layer if layer c.) is the extrusion lining layer made of polypropylene,
5. e.) a metallization layer made of aluminum or a metal oxide layer made of SiO _x or Al _u O _v , where x, u and v are integers, supported by
6. f.) a carrier polymer layer made of biaxially oriented polypropylene with a thickness of between 15 and 25 µm, preferably between 16 and 20 µm, particularly preferably 18 µm,
7. g.) an adhesive layer analogous to the adhesive layer c.) with identical material and basis weight ranges, but with the proviso that the particularly preferred basis weight in the case of forming a laminating adhesive layer is 3.0 g / m ² , and
8. h.) a polypropylene layer, preferably made of cast or blown polypropylene. Layer h.) is preferably provided with color pigments, particularly preferably with white color pigments. The thickness of the layer h.) is preferably between 40 and 100 μm, particularly preferably between 50 and 70 μm, even more preferably 60 μm. The layer h.) can be coextruded from several partial layers. In particular, the layer h.) can be formed on its exposed surface from sealable polypropylene.

1. a.) eine Lage aus Polypropylen, bevorzugt aus Cast- oder Blown-Polypropylen, mit einer Dicke von zwischen 25 und 40 µm, bevorzugt von zwischen 27 und 33 µm, besonders bevorzugt von 30 µm,
2. b.) eine Haftmittellage entweder aus Kaschierkleber, beispielsweise auf Polyurethan-Basis, mit einem Flächengewicht von zwischen 2 und 5 g/m², bevorzugt von zwischen 3 und 4 g/m², besonders bevorzugt von 3,5 g/m², oder als Extrusionskaschierlage aus Polypropylen mit einem Flächengewicht von zwischen 12 und 20 g/m², bevorzugt von zwischen 13 und 17 g/m², besonders bevorzugt von 15 g/m²,
3. c.) eine Polypropylen-Lage, bevorzugt aus Cast- oder Blown-Polypropylen. Bevorzugt ist die Lage c.) mit Farbpigmenten versehen, besonders bevorzugt mit weißen Farbpigmenten. Die Dicke der Lage c.) beträgt bevorzugt zwischen 40 und 100 µm, besonders bevorzugt zwischen 50 und 70 µm, noch stärker bevorzugt 60 µm. Die Lage c.) kann aus mehreren Teilschichten coextrudiert sein. Insbesondere kann die Lage c.) an ihrer freiliegenden Oberfläche aus siegelfähigem Polypropylen gebildet sein.

The second packaging layer material can, for example, have the following structure from the outside to the inside, i.e. towards the outer packaging space:

1. a.) a layer made of polypropylene, preferably made of cast or blown polypropylene, with a thickness of between 25 and 40 µm, preferably between 27 and 33 µm, particularly preferably 30 µm,
2. b.) an adhesive layer either made of laminating adhesive, for example based on polyurethane, with a basis weight of between 2 and 5 g/m ² , preferably between 3 and 4 g/m ² , particularly preferably of 3.5 g/m ² , or as an extrusion laminating layer made of polypropylene with a basis weight of between 12 and 20 g/m ² , preferably between 13 and 17 g/m ² , particularly preferably of 15 g/m ² ,
3. c.) a polypropylene layer, preferably made of cast or blown polypropylene. Layer c.) is preferably provided with color pigments, particularly preferably with white color pigments. The thickness of layer c.) is preferably between 40 and 100 μm, particularly preferably between 50 and 70 μm, even more preferably 60 μm. Layer c.) can be coextruded from several partial layers. In particular, layer c.) can be formed on its exposed surface from sealable polypropylene.

Layer a.) of the second packaging layer material can carry an EVOH layer on its side facing the inner packaging volume, for example due to coextrusion, in order to also give the second packaging layer material certain barrier effects. If an EVOH Layer is formed between the mentioned layer of polypropylene and the adhesive layer, this layer is between 20 to 50 μm thick.

As has been found, the bursting strength of the collective packaging is greater if at least one of the specified adhesive layers is made of an extruded polypropylene layer for the extrusion-laminated connection of the outer BoPP layer with the metallization on the carrier polymer layer made of BoPP and/or for connecting the carrier polymer layer to the inner layer Cast or blown polypropylene is formed instead of an adhesion-laminated connection by interposing an adhesive layer, for example made of polyurethane. The current theory explains this by the fact that the extrusion-laminated connection made of polypropylene has a higher internal damping than the adhesion-laminated connection using adhesive application. The polypropylene layer for extrusion lamination is generally less inherently rigid or has a lower modulus of elasticity and is thicker than an adhesive application instead of extrusion lamination. The bursting strength is tested by dropping the packaging system from a height of 1 m and 1.5 m onto a flat, hard surface, such as concrete, ceramic or stone.

The collective packaging when first closed after filling contains gas and two or more individual packaging. The gas may be conventional air or may be an inert atmosphere of an inert gas or a relatively inexpensive quasi-inert gas such as nitrogen or carbon dioxide. Tests have shown that, in order to achieve the best possible bursting strength, it is advantageous if a larger part of the volume of the outer packaging space is occupied by individual packaging and only a smaller part of the volume of the outer packaging space is occupied by gas. The volume occupied by the individual packaging in the outer packaging space is preferably 2 to 5 times as large as the volume occupied by gas in the outer packaging space. An even further improvement in the bursting strength can be achieved by providing an overpressure in the outer packaging space compared to the external environment of the collective packaging, the excess pressure preferably being 1.1 to 1.3 times the pressure of the external environment outside the collective packaging. If in doubt, the overpressure situation should be checked at a room temperature of 20 °C. So if there is a pressure of 1013 hPa in the external environment of the collective packaging as a standard atmosphere at 20 ° C room temperature, there is preferably a pressure of 1114 hPa to 1317 hPa in the outer packaging space.

• 1 eine grobschematische perspektivische Ansicht einer erfindungsgemäßen Ausführungsform eines Verpackungssystems der vorliegenden Anmeldung,
• 2 eine grobschematische Querschnittansicht durch die Verschlussleisten der Sammelverpackung von 1,
• 3 eine grobschematische Querschnittansicht durch das erste Verpackungslagenmaterial der Sammelverpackung von 1, und
• 4 eine grobschematische Querschnittansicht durch das zweite Verpackungslagenmaterial der Individualverpackungen von 1.

The present invention is explained in more detail below with reference to the accompanying drawings. It shows:

• 1 a roughly schematic perspective view of an embodiment of a packaging system according to the invention of the present application,
• 2 a roughly schematic cross-sectional view through the closure strips of the collective packaging 1 ,
• 3 a roughly schematic cross-sectional view through the first packaging layer material of the collective packaging 1 , and
• 4 a roughly schematic cross-sectional view through the second packaging layer material of the individual packaging 1 .

In 1 A packaging system of the present invention is shown only roughly schematically and by way of example and is generally designated 10. The packaging system 10 includes an outer collective packaging 12 in the form of a sealed edge bag with a folded bottom at its lower end region 12a, chosen only as an example. In an outer packaging space 14 surrounded by the collective packaging 12, individual packaging 16, indicated by dashed lines, is accommodated in the shape of four-edge sealed bags, chosen only as an example. The individual packaging 16 contains, for example, pre-cooked vegetables, such as carrots, peas, beans, potatoes and the like. The individual packaging 16 was therefore sterilized before its outer packaging in the collective packaging 12 using a known retort sterilization process using superheated steam at a temperature of between 120 ° C and 135 ° C. The individual packaging 16 was exposed to the elevated temperatures over a period of time ranging from 10 minutes to 120 minutes.

The remaining volume of the outer packaging space 14 is filled with a quasi-inert gas, in the present case for example dry nitrogen, in order to delay an attack of oxygen and moisture (water vapor) on the vegetables packed in the individual packaging 16 for as long as possible.

The collective packaging 12 is made from a single piece of first packaging layer material 18, which is folded back on itself in its lower end region 12a and is closed by a circumferential sealing edge 20 to form the outer packaging space 14.

At its head area 12b is on the outside 18a of the first packaging layer material rials 18 graphically shows a target cutting line 22 for forming a removal opening. By cutting along the target cutting line 22, the head area 12b with the transverse section of the sealing edge 20 is separated from the rest of the collective packaging 12. After this separation, the outer packaging space 14 is accessible for removing one or more individual packages 16.

Since, as a rule, only a part of the total individual packaging 16 packed in the collective packaging 12 is removed during a first removal process, while a remaining part of the individual packaging 16 remains in the outer packaging space 14 of the collective packaging 12, the collective packaging 12 has a closure device 24, which has a allows the removal opening formed along the desired cutting line 22 to be closed again.

For example, the closure device 24 has a so-called “zipper” 26 with two opposing closure strips 26a and 26b. The zipper 26 is located between the viewer 1 facing front packaging wall 12c and that of the viewer 1 facing away from the rear packaging wall 12d of the collective packaging 12 and is attached to their respective inner sides facing each other (see also 2 ). The zipper 26 forms a positive locking device mentioned in the introduction to the description.

In addition, in the exemplary embodiment shown, the closure device 24 has an adhesive zone 28 with a cold adhesive applied to the inside of the front packaging wall 12c on the side of the zipper 26 facing the packaging space 14 on the inside of the front packaging wall 12c of the collective packaging 12. In the first closed state, the adhesive zone 28 can initially be covered by a strip of release material in order to prevent its adhesive effect with respect to the opposite inside of the rear packaging wall 12d of the collective packaging 12. After the strip of release material has been removed, the adhesive zone 28 is exposed to the opposite inside of the rear packaging wall 12d. Alternatively, the adhesive zone 28 can be adhesively bonded to the inside of the rear packaging wall 12d in a peelable manner, so that for the first opening of the collective packaging 12, in addition to separating the head area 12b, it is also necessary to separate the front and rear packaging walls 12c and 12d.

The closure device 24 also has a further adhesive zone 30 made of cold glue on the outside, i.e. on the outside of the rear packaging wall 12d facing away from the outer packaging space 14, which makes it possible to roll up the collective packaging 12 from the removal opening to the lower region 12b and the roll thus formed to be fixed “outside to outside” by the additional adhesive zone 30. The further adhesive zone 30, which, like the adhesive zone 28, has a pressure-sensitive cold adhesive on one of the insides of the packaging walls 12c or 12d, is covered by release material until it is activated. The release material can be, for example, a strip of silicone-coated paper or similar. By covering the further adhesive zone 30, it is prevented that an area of the outside of the collective packaging 12 is sticky and that a consumer is undesirably caught with parts of his clothing or his hands by the further adhesive zone 30.

After the collective packaging 12 is opened, the quasi-inert protective gas atmosphere originally contained therein escapes. In order to be able to reduce the absolute content of oxygen and moisture in the outer packaging space 14 after resealing, a valve 32 is arranged in the packaging wall, in the example shown in the front packaging wall 12c of the collective packaging 12, through which gas can escape from the outer packaging space 14 the external environment U of the collective packaging 12 can be displaced, for example by manually compressing the collective packaging 12 while reducing the volume of its outer packaging space 14.

In order to be able to reduce not only the absolute gas content but also the oxygen and moisture content of the gas atmosphere inside the outer packaging space 14, in the example shown the inside of the front packaging wall 12c has or in its polymer layer 54 which is exposed towards the outer packaging space 14 (see 3 ) an absorber zone 34 in which microencapsulated oxygen and moisture absorbers are accommodated. The microcapsules can be broken by local pressure on the absorber zone 34 and the respective absorbers can be released, so that they develop their effect on the gas atmosphere in the outer packaging space 14 and absorb oxygen and moisture.

The absorber zone 34 overlaps with the adhesive zone 28, so that when the collecting packaging 12 is reclosed, pressure is also exerted on the absorber zone 34 by the adhesive zone 28 and thus at least some of the absorbers arranged there are activated.

Additionally or alternatively, at least one gas-permeable bag 36 with an oxygen and/or moisture can be in the outer packaging space 14 Activity absorber can be included in order to permanently remove oxygen and moisture from the gas atmosphere in the outer packaging space 14.

Additionally or alternatively, a container 38 can be accommodated in the outer packaging space 14 as a source of a quasi-inert gas. After the collection packaging 12 has been resealed, the container 38 can be broken and an atmosphere rich in quasi-inert gas and thus a relatively poor oxygen and moisture atmosphere can be created in the outer packaging space 14, at least within certain limits.

In 2 the zipper 26 of the positive locking device 24 is shown in cross section. The drawing layer of 2 runs orthogonally to the direction of the closure strips 26a and 26b of the zipper 26, which are preferably formed by strand extrusion.

The closure strip 26a comprises a core strip 26a1 made of polyamide in the example shown, which is connected to the inside 12e of the front packaging wall 12c, for example by gluing. The core strip 26a1 has a male form-fitting formation 40, which can be inserted into a female form-fitting formation 42 of the core strip 26b1, preferably also made of polyamide, of the closure strip 26b of the zipper 26 connected to the inside 12f of the rear packaging wall 12d and can be latched with it so that it can be overcome.

Along the entire length of the closure strips 26a and 26b, the core strips 26a1 and 26b1 each carry two barrier formations 26a2 and 26a3 or 26b2 and 26b3. These barrier formations are formed from a vinyl alcohol polymer, EVOH in the example shown, and increase the barrier properties of the zipper 26 in the closed state against migration of oxygen through the zipper 26 from the external environment U into the outer packaging space 14. The core strips 26a1 and 26b1 form a moisture barrier, so that the zipper 26 as a whole significantly inhibits both the migration of oxygen and the migration of moisture through the closed zipper 26. The barrier formations 26a2 and 26a3 on the one hand and 26b2 and 26b3 on the other hand are dimensioned such that when the zipper 26 is closed, the barrier formations 26a2 and 26b2 butt against one another and so do the barrier formations 26a3 and 26b3. Thus, only a small gap remains as a barrier-free migration path through the closed zipper 26, which, however, is deflected several times by the design of the positive locking formations 40 and 42 and thus forms a labyrinth seal, which also makes it difficult for oxygen and moisture to migrate through the closed zipper 26 .

In 3 An exemplary cross section through a possible design of the first packaging layer material 18 is shown in rough schematic form. The side 18a of the first packaging layer material 18 is the outside facing the consumer. The opposite side 18b is the side facing the outer packaging space 14 on the finished collective packaging 12.

The outside 18a is formed by a layer of biaxially oriented polypropylene (BoPP) 44, which is counter-printed with a layer 46 of printing inks on its side opposite the outside 18a in order to provide consumer information, protected from the influences of the external environment U by the layer 44 visible to the consumer on the collective packaging 12. The layer 44 has a preferred thickness of 20 μm. The layer 46 of printing inks is considerably thinner than the layer 44 and its thickness depends on the number of printing inks that are printed on the layer 44 in counter-printing.

The first packaging layer material 18 also has a biaxially oriented polypropylene layer 48 as a carrier polymer layer, which has a metallization layer 50 deposited from a vapor phase on its side facing away from the outer packaging space 14. This metallized BoPP layer 48, more precisely: the metallization layer 50 carried by it, is adhesion-laminated with the layer 46 made of printing inks by an intermediate adhesive 52 made of polyurethane. The adhesive layer 52 made of polyurethane has a basis weight of preferably 3.5 g/m ² . The carrier polymer layer 48 has a preferred thickness of 18 μm. The deposited metallization layer 50 usually has a thickness of less than 1 μm.

The inside 18b of the first packaging layer material 18 is formed by a non-stretched layer 54 made of polypropylene. The layer 54 can be formed from cast or blown polypropylene. It has no orientation of its polypropylene that goes beyond the molecular orientation caused by conventional production of a cast or blown polypropylene film, for example by calendering, and is sealable, so that the sealing edge 20 of the collective packaging 12 is heat-sealed in zones by adjacent layers 54 of the folded first Packaging layer material 18 is formed. The layer 54 has a preferred thickness of 60 μm.

The layer 54 is extrusion-coated with the carrier polymer layer 48 made of biaxially oriented polypropylene passes through an interposed extruded layer 56 made of polypropylene. The extrusion lamination of the layer 54 with the layer 48 by the further polypropylene layer 56 with a basis weight of approximately 15 g/m ² increases the bursting strength of the collective packaging 12 or the packaging system 10 when falling from a height of 1 m or 1.50 m significantly on a hard surface. The reason for this is probably the internal friction and damping of the extrusion laminating layer 56 made of polypropylene, which is approximately 5 to 8 times thicker than a similarly effective adhesive layer made of polyurethane, which, however, can be used instead of the extrusion laminating layer 56.

The metallization layer 50 gives the first packaging layer material 18 very good barrier properties with respect to migration of oxygen and moisture through the first packaging layer material 18 with an oxygen transfer rate of less than 0.5 cm ³ / (m ¹ ·d · bar) and with a water vapor transfer rate of less than 0.5 g/(m ² ·d).

In 4 a roughly schematic cross section is shown through a second packaging layer material 60, from which the individual packaging 16 is formed in the illustrated embodiment.

The outside 60a of the second packaging layer material 60 facing away from the inner packaging space 70 is formed by a layer 62 made of polypropylene, preferably made of blown polypropylene. The layer 62 does not have a molecular orientation of its polypropylene that goes beyond the orientation caused by conventional production of a blown polypropylene film, for example by calendering. The layer 62 has a preferred thickness of 30 μm.

The inside 60b facing the inner packaging space 70 is formed by a layer 64 made of cast or blown polypropylene. This layer 64 also has no molecular orientation of its polypropylene that goes beyond the orientation caused by conventional production of a cast or blown polypropylene film, for example by calendering. The layer 64 is preferably 60 μm thick and colored white. It is sealable, so that the individual packaging 16 can be formed by heat sealing adjacent inner sides 60b of the second packaging layer material 60.

In order to be able to produce individual packaging 16 that is as burst-proof as possible, the two outer layers 62 and 64 are preferably connected to one another by an extrusion laminating layer 66 made of polypropylene. The extrusion laminating layer 66 preferably has an application weight of 15 g/m ² .

The layer thicknesses mentioned are preferred layer thicknesses. The thicknesses of the individual layers of first and second packaging layer material can be in the thickness ranges specified in the introduction to the description for the individual layers.

Both the first packaging layer material 18 and the second packaging layer material 60 each have a weight proportion of polypropylene of more than 90%, preferably even more than 95%, which is why each of the packages 12 and 16 formed from them are recycled in a monomaterial recycling stream can.

Alternatively, an oxygen barrier layer 68 made of EVOH with a thickness of between 20 to 50 μm can be arranged between the layer 62 and the extrusion laminating layer 66. The EVOH layer 68 can be created by coextrusion with the polypropylene layer 62.

Although the EVOH layer 68 does not survive a retort sterilization process, which is used in particular for food packaging, unscathed, the optional additional EVOH layer 68 can nevertheless increase the performance of the packaging system 10. The EVOH layer 68 can suffer a so-called “retort shock” during retort sterilization, which reduces its oxygen barrier properties, i.e. increases the overall oxygen transfer rate that can be achieved with the second packaging layer material 60. On the one hand, the oxygen transfer rate is reduced by the second packaging layer material up to the retort shock. On the other hand, a second packaging layer material 60 with EVOH layer 68, but with retort shock, still has lower oxygen transfer rates than the same packaging layer material without EVOH layer 68. Individual packaging formed from the second packaging layer material 60 with EVOH layer 68 thus protects 16 products packaged therein Oxygen access until the individual packaging 16 is packed in the collective packaging 12.

As the term “retort shock” expresses, the oxygen barrier effect, which is initially significantly reduced by retort sterilization, is not permanent. Some of the oxygen barrier effect lost during retort sterilization is regained over time, possibly through plastic flow of EVOH within the layer formed from EVOH. The theory behind the regression of the oxygen barrier effect after retort sterilization and Test tube shock is not completely understood, but can be proven phenomenologically.

Nevertheless, the oxygen transfer rate of the second packaging layer material 60, even with EVOH layer 68, is at least a factor of six higher than the oxygen transfer rate of the first packaging layer material 18.

Claims (15)

Thermally sterilizable packaging system (10), comprising an outer collective packaging (12) which surrounds an outer packaging space (14) in which at least two inner individual packages (16) are accommodated, each individual packaging (16) surrounding an inner packaging space (70) and is designed for packaging a product, wherein the collective packaging (12) is formed from a first packaging material (18), which comprises at least one polymer layer (44, 48, 52, 54, 56) as packaging layer material (18), and wherein the individual packaging ( 16) are formed from a second packaging material (60) that is different from the first, wherein a packaging material (18, 60) made of first and second packaging material as a high-barrier packaging material has an oxygen permeability of less than 0.5 cm ³ / (m ² d bar ), determined according to DIN 53380-3 at 23°C and 85% relative humidity, and a water vapor permeability of less than 0.5 g/(m ² ·d), determined according to ISO 15106-2 at 23°C and 85% relative humidity Moisture, and wherein the respective other packaging material (18, 60) made of first and second packaging material as low-barrier packaging material has an oxygen permeability of more than 3 cm ³ / (m ² d bar), determined according to DIN 53380-3 at 23 °C and 85% relative humidity, and a water vapor permeability of more than 2 g/(m ² ·d), determined according to ISO 15106-2 at 23 °C and 85% relative humidity, characterized in that the first packaging material ( 18) has at least two polymer layers (44, 48, 52, 54, 56) and the high-barrier packaging material, and that the second packaging material (60) is a packaging layer material (60) with at least one polymer layer (62, 64, 66, 68) and is low barrier packaging material. Thermally sterilizable packaging system (10). Claim 1 , characterized in that the collective packaging (12) has a closure device (24) for re-closing a removal opening. Thermally sterilizable packaging system (10). Claim 2 , characterized in that the closure device (24) comprises a positive locking device, wherein the positive locking device has a closure strip (26a, 26b) running along the removal opening on each side of the removal opening, one of the closure strips (26a) having a closure strip (26a) in the longitudinal direction of the one closure strip ( 26a) has a male form-fitting formation (40) running along the removal opening and the other of the closure strips (26a, 26b) has a female form-fitting formation (42) running in the longitudinal direction of the other closure strip (26b) along the removal opening for positively receiving the male form-fitting formation ( 40), each of the closure strips (26a, 26b) being at least partially formed from a vinyl alcohol polymer. Thermally sterilizable packaging system (10). Claim 3 , characterized in that at least one of the closure strips (26a, 26b) has a core strip (26a1, 26b1) which extends over at least 70% of its longitudinal dimension and is made of a polymer material different from the vinyl alcohol polymer, the core strip (26a1, 26b1) being at least in a section over at least 90% of its longitudinal dimension carries a barrier formation (26a2, 26a3, 26b2, 26b3) made of the vinyl alcohol polymer. Thermally sterilizable packaging system (10). Claim 4 , characterized in that each of the two closure strips (26a, 26b) has a core strip (26a1, 26b1) which extends over at least 70% of its longitudinal dimension and is made of a polymer material different from the vinyl alcohol polymer, each core strip (26a1, 26b1) being at least in a section over at least 90% of its longitudinal dimension carries a barrier formation (26a2, 26a3, 26b2, 26b3) made of the vinyl alcohol polymer, wherein in the closed state of the positive locking device, when the male and female positive locking formations (40, 42) are in positive engagement with one another , the barrier formations (26a2, 26a3, 26b2, 26b3) of the two closure strips (26a, 26b) are in contact with one another over at least 80% of the engagement length of the positive locking formations (40, 42). Thermally sterilizable packaging system (10) according to one of Claims 3 until 5 , characterized in that the positive locking device comprises a sliding slide that can be moved along the closure strips (26a, 26b) as an actuation aid for actuating the positive locking device, the sliding slide encompassing the closure strips (26a, 26b) and when moving in a direction along the longitudinal dimension of the closure strips (26a , 26b) the production of a positive locking engagement between the male and female positive locking formation (40, 42) at least supports and, when moving in the opposite direction, at least supports the cancellation of a positive locking engagement between the male and female positive locking formations (40, 42). Thermally sterilizable packaging system (10) according to one of Claims 2 until 6 , characterized in that the closure device (24) has an adhesive zone (28, 30) with a cold adhesive, the cold adhesive being applied to a surface of a packaging wall section (12c) of the collective packaging (12) for bonding to another packaging wall section (12d) of the collective packaging ( 12) is arranged. Thermally sterilizable packaging system (10). Claim 7 , characterized in that the collective packaging (12) as a collective packaging bag has a front packaging wall (12c) and a rear packaging wall (12d), between which the outer packaging space (14) is located, the cold adhesive zone (28, 30) being arranged: i .) on an inside (12e, 12f) of a packaging wall (12c, 12d) facing the other packaging wall (12d, 12c) consisting of the front and rear packaging walls (12c, 12d) for adhesive connection to the inside (12f, 12e) of each other packaging wall (12d, 12c) and/or ii.) on an outside (18a) of a packaging wall (12c, 12d) facing away from the other packaging wall (12d, 12c) consisting of front and rear packaging walls (12c, 12d) for adhesive connection with the outside (18a) of the other packaging wall (12d, 12c). Thermally sterilizable packaging system (10) according to one of the preceding claims, characterized in that a valve (32) is arranged in a wall section of the collecting packaging (12), through which gas from the outer packaging space (14) into the external environment (U) of the Collective packaging (12), but cannot flow in the opposite direction. Thermally sterilizable packaging system (10) according to one of the preceding claims, characterized in that the collective packaging (12) has at least one absorber consisting of an oxygen absorber and a moisture absorber. Thermally sterilizable packaging system (10). Claim 10 , characterized in that at least one absorber from the oxygen absorber and the moisture absorber is pressure-activated and integrated in a polymer layer that is exposed towards the outer packaging space. Thermally sterilizable packaging system (10). Claim 11 , including the Claim 7 , characterized in that an absorption zone (34) of the collective packaging (12) formed by integrating at least one pressure-activated absorber from the oxygen absorber and the moisture absorber into the polymer layer (54) which is exposed to the outer packaging space (14) with the adhesive zone (28, 30) overlapped. Thermally sterilizable packaging system (10) according to one of the preceding claims, characterized in that an activatable gas source (38) with an at least oxygen-reduced gas is accommodated in the outer packaging space (14) of the collective packaging (12). Thermally sterilizable packaging system (10) according to one of the preceding claims, characterized in that the first packaging layer material (18) has a metallization layer (50) and/or a metal oxide layer and/or a vinyl alcohol-containing polymer layer as a barrier layer to reduce migration of oxygen and/or and having moisture through the first packaging layer material (18). Thermally sterilizable packaging system (10) according to one of the preceding claims, characterized in that the first packaging layer material (18) is formed of at least 90% by weight of polymer of one and the same monomer and/or that the second packaging layer material (60) is at least 90% by weight % by weight is formed from polymer of one and the same monomer.

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