EP2285558B2 - Packaging-film section, packaging film, packaging and packaging/product unit - Google Patents

Description

The invention relates to a packaging film according to the preamble of claim 1.

Coatings for food packaging are known which are used to protect the packaged food from attack by microorganisms such as bacteria, fungi or other germs. As can be seen from the WO 2006/133754 A1 results, two fundamentally different functional principles of antimicrobial layers are known.

The first functional principle is characterized by the fact that the antimicrobial active ingredients and inhibitors integrated into the layer are volatile and are released over time from a material of the layer, whereby the antimicrobial effect occurs not only in the vicinity of the coated surface but in the entire packaging volume.

The second functional principle is characterized in that the antimicrobial active ingredients and inhibitors are spatially fixed in the functional layer in such a way that they cannot escape independently from the carrier layer. With functional layers of this type, the antimicrobial effect only develops when the packaged goods come into direct contact with the antimicrobial coated surface.

The WO 2006/133754 A1 describes an advanced process with which a technical surface with an antimicrobial agent-releasing layer can be produced. A solution of polyvinyl acetate, a preservative and a solvent is applied to the technical surface and dried on the technical surface to form the antimicrobial layer.

In addition to the previously described functional layers with an antimicrobial effect, functional layers are known in which chemical compounds are integrated that absorb oxygen and permanently chemically bind it. Such chemical compounds are called oxygen scavengers (oxygen scavengers). The function of these scavengers is often to create and maintain an oxygen-free atmosphere in the packaging in order to ensure an extended shelf life of the packaged goods. For this purpose, the direct connections must on the one hand remove the remaining oxygen that is in the packaging space as quickly as possible, on the other hand, the connections, if they are integrated into the outer packaging material, represent an active barrier for oxygen migrating from the outside into the packaging.

The WO 2007/051860 A1 now describes a new type of lacquer material that has an oxygen-scavenging property. This comprises a matrix consisting of organic polymers and at least one component which, after suitable triggering, is reactive towards oxygen.

The functional layers described above (antimicrobial layers / oxygen-scavenging layers) have proven themselves particularly in food packaging and pharmaceutical packaging. However, the integration of functional layers of this type into packaging material often entails difficulties, especially when the functional layer must have direct contact with the packaged product and / or the packaging volume in order to achieve the desired effect. In order to be able to realize this, the functional layer would have to be sealable in addition to its antimicrobial and / or oxygen-scavenging property in order to be able to close the packaged goods in a moisture-tight and / or airtight manner. In the case of non-sealable functional layers, it would only be possible to cover the entire surface with a sealable layer, which would, however, result in the loss of direct contact with the packaged goods and at least reduce the functional effect of the functional layer.

The invention is therefore based on the object of proposing a packaging film with a packaging film section comprising a functional layer having an antimicrobial and / or oxygen-scavenging property, which at least in sections forms an outer layer of the packaging film and yet does not have to be sealable.

This object is achieved by a packaging film with the features according to claim 1. Here, an annular sealing surface is to be understood as an area encircling, ie endless, sealing surface that runs around the circumferential direction around the section of the functional layer forming an outer layer of the packaging film section or the functional layer forming an outer layer of the packaging film section, the shape of which is not limited to a specific geometric shape is limited. Thus, under an annular sealing surface, in addition to an annular sealing surface, there are also all other geometric shapes, such as, for example, rectangular, square or oval ring shapes to understand.

The invention is based on the idea that in the event that the functional layer of the packaging film section only partially forms an outer layer of the packaging film section, that is, only partially in relation to its surface extent extends up to the outside of the packaging film section, this section forming an outer layer of the packaging film section Functional layer, at least in sections, preferably completely, to be arranged in an area which is enclosed on the outside (outer surface) of the packaging film section by an annular sealing surface, ie around the section. In the event that (based on its surface extension) the entire functional layer extends to the outside of the packaging section, i. H. In the event that the functional layer completely forms an outer layer of the packaging film section, it is provided in a packaging film designed according to the concept of the invention that the functional layer, at least partially, preferably completely, is arranged in an area that is on the outside (outer surface) of the packaging film section by a ring-shaped, ie enclosed around the area encircling sealing surface.

In other words, the essence of the invention is to form the outer surface of the packaging film section only partially with the aid of the entire functional layer or with the aid of a section of the functional layer and to form at least a partial area of the outer surface of the packaging film section with an annular sealing surface that is arranged in this way that it completely surrounds the section of the functional layer or the functional layer, ie encloses it. The sealing surface is preferably formed by a sealable, in particular heat-sealable material which, in a finished packaging formed with the aid of a packaging film designed according to the concept of the invention, forms a sealing seam that seals the packaged goods, in particular airtight and / or moisture-tight. It is within the scope of the invention, as will be explained later, that the packaging film is sealed to itself in the area of the annular sealing surface, for example to produce a bag-shaped packaging, or to another packaging part, in particular another packaging film and the product encloses, the functional layer in this case preferably forming the inside of the packaging facing the product (packaged goods). A packaging film designed according to the concept of the invention places significantly lower demands on the properties of the functional layer, since the functional layer itself does not have to be sealed - the sealing function takes over, preferably exclusively, the sealing surface surrounding the functional layer, i.e. the circumferential sealing surface. The functional layer is preferably a non-sealable or at least poorly sealable layer.

With regard to the formation of the single or multi-layer substrate and the arrangement of the functional layer relative to the substrate, there are the most varied of possibilities. For example, it is possible for the substrate to consist only of a single layer, for example an aluminum layer. Alternatively, it is possible to provide a multilayer substrate as the substrate, which is made up of different functional layers. The functional layer is preferably printed directly onto the single-layer or multilayer substrate. In the case of a multilayer substrate, an embodiment is preferred in which the layer immediately adjacent to the functional layer is a primer layer which serves as an adhesion promoter in order to ensure a better hold of the functional layer. Adhesion improvement can also be achieved by appropriate pretreatment of the substrate, for example by plasma treatment. It is within the scope of the invention to apply the primer layer shortly before the functional layer is printed and thus make it part of the substrate for heating the functional layer.

In a further development of the invention it is advantageously provided that the outer side / outer surface / flat side of the packaging film section does not have a functional layer in an area outside the annular sealing surface - that is, the section of the functional layer forming an outer layer of the packaging film section or the entire functional layer forming an outer layer is exclusively located in the area enclosed by the annular sealing surface. In the case of a packaging film that consists exclusively of a single packaging film section, it is advantageous if no functional layer is provided on the entire outside / outer surface of the packaging film in an area outside the area enclosed by the sealing surface, since this, in particular non-sealable, functional layer is would be outside the actual product space.

There are different possibilities with regard to the relative arrangement between the sealing surface and the functional layer.

In one embodiment, the functional layer is printed on the substrate, preferably on a primer layer of the substrate, and the sealing layer is located above (offset in the direction of the outside) of the functional layer, i.e. covers it in a ring shape and thereby closes an inner and an outer layer of the packaging film section forming section of the functional layer. Here, too, it is conceivable for the sealing layer to be applied directly to the functional layer, preferably to be printed. However, an embodiment is particularly preferred in which the sealing layer is applied, in particular printed, to a suitable primer layer applied to the functional layer to improve adhesion. An embodiment can also be implemented in which both the sealing layer and the functional layer are applied to the substrate, preferably to a corresponding adhesion promoter primer layer. In this case, for example, the functional layer can be applied in an inner region with a first pressure roller and the annular sealing surface around the functional layer with a second pressure roller. In this case, the functional and sealing layers, at least essentially, do not overlap - they possibly run somewhat into one another, but can also specifically have a pressure-free gap between them. The entire functional layer (i.e. the functional layer over its entire surface extension) thus forms an outer layer of the packaging film section. To apply the sealing layer and the functional layer, it can be advantageous to at least partially cure the layer applied first (sealing layer or functional layer) before applying the layer applied thereafter (functional layer or sealing layer), for example by means of heat or radiation.

With regard to the geometric arrangement of the functional layer or the section of the functional layer within the annular sealing surface, there are again several possibilities. Thus, in order to provide a large-area arrangement of the functional layer or a section of the functional layer and thus the largest possible contact area, the functional layer or the section of the functional layer can be applied over the entire area within the annular sealing surface, preferably in such a way that the entire area of the annular sealing surface enclosed area is filled by the functional layer. Alternatively, it is possible to arrange the functional layer only in at least one area within the sealing surface, wherein the functional layer can be applied, for example, as a pattern, preferably as a regular pattern.

An embodiment can also be implemented in which the functional layer or the section of the functional layer is formed from several layer sub-sections arranged next to one another, with at least two layer sub-sections of the functional layer or the section of the functional layer having a different function. For example, layer sections with an antimicrobial effect and layer sections catching oxygen can be arranged in a checkerboard manner within the annular sealing surface.

As explained above, the material forming the functional layer (in particular a material composition) is, for example, a printable material, that is to say can be applied by means of at least one printing process, in particular onto the substrate and / or a sealing layer. This can, for example when using digital printing processes, be in powder form in the manner of a toner for laser printers. However, a liquid version of the material is particularly preferred, so that the material can be applied to the substrate, for example, by roller printing, flexographic printing, inkjet printing, gravure printing or also by a correspondingly designed digital printing process.

In a further development of the invention it is advantageously provided that the substrate is either designed as a barrier layer or has a barrier layer. The barrier layer is preferably a layer that is effective with regard to avoiding oxygen diffusion in order to prevent oxygen, such as oxygen from the ambient air, from penetrating into the packaging or through the substrate into the functional layer. It is particularly suitable here to form the barrier layer from aluminum or an aluminum alloy or to use a barrier layer which is at least aluminum-containing.

Substrates that have a barrier layer can be, for example, foils containing at least one layer or film made of polyvinyl chloride, of ethylene vinyl alcohol or containing at least one metallic layer or a layer of silicon oxides or aluminum oxides vapor-deposited in vacuo. With regard to the antimicrobial effect, a barrier layer in the substrate is less critical and can be omitted in some cases.

With regard to the specific design of the, preferably not or only slightly, sealable functional layer, there are the most varied of possibilities. An embodiment is particularly preferred in which the functional layer as in FIG WO 2006/133754 A1 is designed as described. The WO 2006/133754 A1 is to apply with regard to the formation of the functional layer as part of the disclosure content of the present application disclosed, with the result that at least one feature of the present application with at least one feature of the WO 2006/133754 A1 can be combined and stressed. It is particularly preferred if the functional layer is designed in such a way that it releases antimicrobial active substances such as benzoic acid, sorbic acid, natamycin, bacteriocins, plant extracts or mixtures thereof. Other active ingredients are silver, silver ions, quaternary ammonium compounds or quaternary phosphonium compounds. To achieve an antimicrobial effect, the functional layer can, for example, release antimicrobial active substances (release system). It is also possible that the functional layer contains bound or enclosed antimicrobial compounds (contact toxicity). In addition, the functional layer can form a biophobic and / or anti-adhesive surface.

In addition or as an alternative, the functional layer can, as mentioned at the outset, be designed as an oxygen scavenger layer with at least one chemical compound (scavenger) that is reactive towards oxygen. The functional layer is particularly preferred, at least in sections, as in FIG WO 2007/051860 A1 described trained. The WO 2007 051860 A1 with regard to a possible design variant of the functional layer as disclosed belonging to the subject of the disclosure of the present application, with the result that any feature of the present application with at least any feature of the WO 2007 051860 A1 can be combined and stressed.

The functional layer can contain, for example, antioxidants which self-oxidize in order to scavenge oxygen. Other substances are oxygen adsorbers, which bind the oxygen through physical trapping. Still other modes of action are oxygen scavengers, which chemically bind the oxygen. Catalytic reactions offer further possibilities, with oxygen representing at least one of the reactants.

As indicated at the outset, an embodiment of the packaging film can be implemented in which it has only a single, previously described packaging film section or is formed by only a single packaging film section described above. This is particularly advantageous when the packaging only has a single packaged goods space. Alternatively, the packaging film comprises a plurality of previously described packaging film sections arranged next to one another, in particular in the transverse direction or in the longitudinal direction of the packaging film, with at least two packaging film sections preferably having an annular sealing surface, with each annular sealing surface on the outside of the packaging film preferably enclosing a section of the functional layer. It is possible, and desirable for many application purposes, for adjacent sealing surfaces to merge into one another or to form a common sealing surface, with several functional layer sections of the packaging film which are spaced apart from one another and which are enclosed by the common sealing surface being arranged within the common sealing surface. The packaging film is preferably separated from a large-area packaging film, for example by cutting or punching, it being possible for the large-area packaging film to be stacked in sheets or rolled up on a roll, for example.

Fig. 1:

eine Verpackungsfolie mit einem einzigen Verpackungsfolienabschnitt, umfassend eine ringförmige Siegelfläche, die einen Bereich umschließt, in dem eine gesamte Funktionsschicht des Verpackungsfolienabschnittes oder ein Abschnitt der Funktionsschicht angeordnet ist,

Fig. 2:

ein alternatives Ausführungsbeispiel einer Verpackungsfolie mit mehreren in Längsrichtung sowie in Querrichtung nebeneinander angeordneten Verpakkungsfolienabschnitten,

Fig. 3:

ein weiteres alternatives Ausführungsbeispiel einer Verpackungsfolie mit einer Vielzahl von Verpackungsfolienabschnitten, wobei die Verpackungsfolie als Rolle gerollt ist,

Fig. 4a:

eine geschnittene Darstellung einer möglichen Ausführungsform einer Verpackungsfolie, bei der die Funktionsschicht sich auf einer Siegelschicht befindet und die gesamte Funktionsschicht des Verpackungsabschnittes sich innerhalb einer von der Siegelschicht gebildeten, ringförmigen Siegelfläche angeordnet ist (Stand der Technik),

Fig. 4b:

eine geschnittene Darstellung einer alternativen Ausführungsform einer Verpackungsfolie, bei der sich die Siegelschicht oberhalb der Funktionsschicht befindet und ein Abschnitt der Funktionsschicht innerhalb einer von der Siegelschicht gebildeten ringförmigen Siegelfläche angeordnet ist,

Fig. 4c:

eine geschnittene Darstellung einer weiteren alternativen Ausführungsform einer Verpackungsfolie, bei der die gesamte Funktionsschicht des Verpackungsfolienabschnittes und die Siegelschicht in einer Ebene nebeneinander angeordnet sind,

Fig. 4d:

eine geschnittene Darstellung einer nicht erfindungsgemäßen Ausführungsform einer Verpackungsfolie, bei der die eine äußere Schicht der Verpackungsfolie bildende Funktionsschicht aus mehreren nebeneinander angeordneten Funktionsschichtteilabschnitten gebildet ist, wobei zwei Arten von Funktionsschichtteilabschnitten vorgesehen sind,

Fig. 4e:

eine geschnittene Darstellung einer weiteren nicht erfindungsgemäßen Ausführungsform einer Verpackungsfolie mit einer auf einer Siegelschicht aufgebrachten Funktionsschicht, wobei die Funktionsschicht nicht vollflächig, sondern nur abschnittsweise aufgedruckt ist und

Fig. 5:

eine geschnittene Darstellung einer als Blisterverpackung ausgebildeten Verpackung mit einer als Deckfolie ausgebildeten Verpackungsfolie (nicht erfindungsgemäß).

Further advantages, features and details of the invention emerge from the following description preferred embodiments and with reference to the drawings. These show in:

Fig. 1:

a packaging film with a single packaging film section, comprising an annular sealing surface which encloses an area in which an entire functional layer of the packaging film section or a section of the functional layer is arranged,

Fig. 2:

an alternative embodiment of a packaging film with several packaging film sections arranged next to one another in the longitudinal direction and in the transverse direction,

Fig. 3:

a further alternative embodiment of a packaging film with a plurality of packaging film sections, wherein the packaging film is rolled as a roll,

Fig. 4a:

a sectional view of a possible embodiment of a packaging film in which the functional layer is on a sealing layer and the entire functional layer of the packaging section is arranged within an annular sealing surface formed by the sealing layer (prior art),

Fig. 4b:

a sectional view of an alternative embodiment of a packaging film in which the sealing layer is located above the functional layer and a portion of the functional layer is arranged within an annular sealing surface formed by the sealing layer,

Fig. 4c:

a sectional view of a further alternative embodiment of a packaging film, in which the entire functional layer of the packaging film section and the sealing layer are arranged next to one another in one plane,

Fig. 4d:

a sectional view of an embodiment of a packaging film not according to the invention, in which the functional layer forming an outer layer of the packaging film is formed from several functional layer sub-sections arranged next to one another, two types of functional layer sub-sections being provided,

Fig. 4e:

a sectional view of a further embodiment of a packaging film not according to the invention with a functional layer applied to a sealing layer, the functional layer not being printed over the entire surface but only in sections, and

Fig. 5:

a sectional view of a packaging designed as a blister pack with a packaging film designed as a cover film (not according to the invention).

In the figures, the same components and components with the same function are identified by the same reference symbols.

In Fig. 1 a packaging film 1 is shown in a view of an outer side 2 formed by a flat side. The outer side 2 of the packaging film 1 lying in the plane of the drawing can, in sections, be the inner side of a packaging film 1 that can be produced in Fig. 1 packaging not shown. The thickness extension of the packaging film 1, ie the extension into the plane of the drawing, is preferably less than 1 mm.

In the Fig. 1 The packaging film 1 shown is formed by a single packaging film section 3.

The outside 2 of the packaging film section 3 is partially formed by a rectangularly contoured, annular sealing surface 4 made of a sealable material, such as a sealing wax, a heat sealing lacquer, a sealing layer or a sealing film, made of sealable materials such as polyolefins, e.g. B. polyethylene, polypropylene, or their copolymers or polyacrylic or polymetacrylic polymers or copolymers, etc.

In an area within the rectangular-ring-shaped sealing surface 4 there is a full-surface application of a functional layer 5, which is printed onto a substrate (not shown) and forms an outer layer of the packaging film section 3. This functional layer 5 has antimicrobial and / or oxygen-scavenging, i.e. H. oxygen-binding properties. When the packaging is finished, the functional layer 5 is the innermost layer that delimits the inner volume of the packaging and, depending on the design and arrangement of the packaged goods, either in direct contact with the packaged goods or in direct contact with the atmosphere surrounding the packaged goods. The functional layer 5 is a non-sealable layer which completely fills the entire area 6, which is rectangular in this exemplary embodiment, within the annular sealing surface 4.

A package produced with the aid of the packaging film 1 is closed by sealing the annular sealing surface 4, in particular by heat sealing, with a counter surface of another packaging part, in particular another packaging film. In a simplest embodiment, it is conceivable to fold the packaging film 1 in half, for example, in such a way that one half of the annular sealing surface 4 lies on the other half comes, whereupon the sealing surface sections are sealed together.

In Fig. 2 an alternative packaging film 1 is shown, which has a total of nine packaging film sections 3, the packaging film sections 3 being arranged next to one another in a uniformly distributed manner in the longitudinal direction L and in the transverse direction Q of the packaging film 1. The packaging film 1 according to Fig. 1 can for example by severing a packaging film section 3 from a packaging film 1 according to Fig. 2 be educated. It can be seen that each packaging film section 3 comprises an annular sealing surface 4 on an outer side 2, each annular sealing surface 4 enclosing an area 6 within which a functional layer 5 of the respective packaging section 3 or only a section of this functional layer 5 is arranged, the functional layer 5 Has oxygen scavenging properties and / or antimicrobial properties.

How to continue from Fig. 2 results, adjacent, annular sealing surfaces 4 merge into one another or have common surface sections. Overall, the ring-shaped sealing surfaces 4 form a matrix structure in which areas 6 are enclosed or which surrounds areas 6 which, in the exemplary embodiment shown, are each completely or alternatively only partially occupied by a functional layer 5 or a section of the functional layer of the respective packaging film section . One in Fig. 2 The packaging film 1 shown serves, for example, as a cover film for closing a bottom film of a blister pack, the areas 6 with the functional layers 5 or the sections of the functional layer 5 then closing cavities formed in the bottom film. The annular sealing surfaces 4 or the sealing matrix formed from sealable material serve or serve to connect the packaging film 1 to the bottom film of the blister pack in a moisture-tight and air-tight manner.

It is also conceivable that the packaging film 1 according to Fig. 2 represents a sheet of packaging film from which packaging film units and in each case at least one packaging film section 3, preferably each with a plurality of packaging film sections 3, can be separated, in particular cut out or punched out.

In Fig. 3 a packaging film 1 is shown, which is partially unwound from a roll 7. The packaging film 1 according to Fig. 3 serves as the basis for the production of packaging film units, such as those in Fig. 1 or Fig. 2 are shown. The packaging film 1 according to Fig. 3 is analogous to Fig. 2 and has a multiplicity of packaging film sections 3 arranged next to one another in the longitudinal direction L (unwinding direction) and in the transverse direction Q, each packaging film section 3 having an annular sealing surface 4 which each surrounds an area 6 with functional layer 5.

In the following, the Figures 4a to 4e different embodiments of cut packaging films 1 rotated by 90 ° in comparison to the preceding figures are shown, the in FIGS Figs. 1 to 3 packaging films 1 shown analogous to the exemplary embodiments according to FIGS Figures 4a to 4e can be executed. For reasons of clarity, the packaging films 1 shown each comprise only a single packaging film section 3, it being understood that a large number of such packaging film sections can be arranged next to one another.

The packaging film 1 according to Figure 4a comprises a substrate 8 which, in the exemplary embodiment shown, is formed by a barrier layer 9 made of aluminum, onto which a sealing layer 10 made of a sealable material is applied over the entire surface. If necessary, further layers can be provided between the barrier layer 9 and the sealing layer 10. On the sealing layer 10, in a central area of a packaging film section 3, there is a functional layer 5 of the packaging film section with antimicrobial properties or oxygen-scavenging properties, the functional layer 5, for example, being printed directly on the sealing layer 10. Alternatively, at least one further layer, preferably exclusively one further layer, preferably a primer layer, is provided between the sealing layer 10 and the functional layer 5 to improve adhesion, it being particularly preferred if the surface extent of this primer layer is at least approximately the same as the surface extent the functional layer 5 corresponds. The outer side 2 of the packaging film 1 or the packaging film section 3 is formed by an annular sealing surface 4 and the functional layer 5 enclosed by the sealing surface 4 on the outer side 2 of the packaging film section 3. The annular sealing surface 4 is formed by that which is not covered by the functional layer 5 Section of the sealing layer 10 (prior art).

In Fig. 4 an alternative embodiment of a packaging film 1 is shown. The single or multi-layer substrate 8 can be seen, on which the functional layer 5 is printed directly over the entire surface, which in sections forms an outer layer of the packaging film section. In this case, a side of the substrate 8 facing the functional layer 5 can be formed, for example, by a primer layer with adhesion improvement properties. The functional layer 5 is covered in an edge section of the packaging film section 3 by a sealing layer 10, which is applied in the form of a ring and which forms the annular sealing layer 4 on its outside, which encloses an inner area 6, which in the embodiment shown is covered over the entire surface by a , an outer layer of the packaging film section 3 forming section 18 of the functional layer 5 is formed. If you look at the outside 2 of the packaging film 1, the result is, as in the embodiment according to FIG Figure 4a , this in Fig. 1 shown picture. The edge section of the functional layer 5 covered by the sealing surface 4 does not form an outer but an inner layer of the packaging film section 3.

In the embodiment according to Figure 4c the entire functional layer 5 and the ring-shaped sealing layer 10 are located, at least in sections, in a common plane. Both the functional layer 5 and the sealing layer 10 are printed onto the substrate 8. If necessary, different or a common functional layer, in particular a primer layer, can be located below the sealing layer 10 and the functional layer 5. The functional layer 5 of the packaging film section 3 and the sealing layer 10 of the packaging film section 3 are preferably applied one after the other, with both layers 5, 10 also being applied together, in particular in the digital printing process. How out Figure 4c results, the ring-shaped sealing surface 4, which is formed by the sealing layer 10, encloses the area 6 which is completely filled by the entire functional layer 5 forming an outer layer of the packaging film section. The entire sealing layer 10 also forms an outer layer of the packaging film section 3.

The embodiment according to Figure 4d corresponds essentially to the embodiment according to Figure 4a . The substrate 8 comprises a sealing layer 10 which is covered in a central area by a functional layer 5 of the packaging film section 3. In an area outside the functional layer 5 forming an outer layer, the sealing layer 10 forms an annular sealing surface 4 which surrounds the functional layer 5 and is part of an outer layer of the packaging film section 3. The functional layer 5 in turn is formed by functional layer sub-sections 11, 12 arranged next to one another, the functional layer sub-sections 11 having an antimicrobial function and the functional layer sub-sections 12 having an oxygen-scavenging function, for example. The formation of the functional layer 5, as in Figure 4d shown and described above, can also in the embodiments according to Figures 4b and 4c will be realized.

In the embodiment according to Figure 4e the substrate 8 comprises, inter alia, a sealing layer 10 which, in an outer region, forms an annular sealing surface 4 which surrounds the region 6. In area 6, a functional layer 5 is provided which is not applied over the entire surface of the sealing layer 10, but rather as a pattern consisting of a plurality of functional layer sub-sections 11 spaced apart from one another Figure 4e The illustrated embodiment variant of the functional layer 5 can be combined with any packaging film variants 1 according to FIGS Figures 4a to 4c be combined.

In Fig. 5 a packaging 13 designed as a blister pack (not according to the invention) is shown. This packaging 13 is formed from a bottom film 14, which can be formed in one or more layers. The bottom foil 14 preferably comprises at least one aluminum-containing layer or is designed as an aluminum-containing layer. A cover film 15 is sealed onto the bottom film 14, the cover film 15 being designed as a packaging film 1, which can be designed as described above. In the exemplary embodiment shown, the packaging film 1 comprises a multilayer substrate 8 which, in addition to an outer barrier layer 9, has a sealing layer 10 applied over the entire surface of the barrier layer 9. The sealing layer 10 is covered in sections by functional layers 5 which are part of packaging film sections 3. In the areas outside of the functional layers 5, the sealing layer 10 forms ring-shaped sealing surfaces 4 which, like the functional layer 5, face the base film 14. The cover film 15 or the packaging film 1 is arranged in such a way that the functional layers 5 directly delimit the cavities 16 made in the bottom film 14, so that the functional layers 5 can have direct contact with a product (packaged goods), not shown, received in the cavities 16 . The sealing surfaces 4 lie directly on shape-congruent counter surfaces 17 of the base film 14, which delimit the cavities 16 at the edge. The sealing surfaces 4 are sealed with these mating surfaces 17, preferably by heat sealing.

Claims (9)

1. Packaging film, in particular for the production of a packaging (13), with at least one packaging film section (3) comprising a single- or multilayer substrate (8), a printed functional layer (5) formed of a printable material and forming at least in sections an outer layer of the packaging film section (3), which is configured in such a way that it has antimicrobial and/or oxygen-scavenging properties, wherein the section (18) of the functional layer (5) forming an outer layer of the packaging film section (3) or the functional layer (5) forming the entire outer layer of the packaging film section on an outside (2) of the packaging film section (3) is arranged at least in sections in an area (6) surrounded by an annular sealing surface (4), characterised in that the sealing surface (4) is formed by a sealing layer (10) covering the functional layer (5) in sections or the sealing surface (4) is formed by a sealing layer (10) applied on the substrate (8), wherein the sealing layer (10) does not overlap the functional layer (5) and the functional layer (5) does not overlap the sealing layer (10).
2. Packaging film according to claim 1, characterised in that the section (18) of the functional layer (5) forming an outer layer of the packaging film section (3) or the functional layer (5) forming the entire outer layer of the packaging film section (3) on the outside (2) of the packaging film section (3) is arranged exclusively in an area (6) surrounded by the annular sealing surface (4).
3. Packaging film according to claim 1 or 2, characterised in that the functional layer (5) is applied inside the area (6) surrounded by the annular sealing surface (4) over the full surface or in sections, preferably as a pattern, in particular regular.
4. Packaging film according to any of the preceding claims, characterised in that the functional layer (5) is formed of different part layer sections (11, 12) arranged next to each other, with preferably at least partly different function.
5. Packaging film according to any of the preceding claims, characterised in that the functional layer (5) is printed by digital printing, flexography, rotogravure or ink jet printing.
6. Packaging film according to any of the preceding claims, characterised in that the substrate (8) is formed as a barrier layer (9), in particular for oxygen, or comprises such a barrier layer (9), in particular containing aluminium.
7. Packaging film according to any of the preceding claims, characterised in that the functional layer (5) has antimicrobial properties in that it is formed to release antimicrobially active substances.
8. Packaging film according to any of the preceding claims, characterised in that the functional layer (5) comprises at least one scavenger component which is reactive against oxygen, preferably only after suitable triggering, preferably with at least one organic residue.
9. Packaging film according to any of the preceding claims, characterised in that the packaging film (1) comprises exclusively one packaging film section (3) or several packaging film sections (3) which are arranged next to each other in particular in the transverse direction and/or longitudinal direction of the packaging film (1).

Images