The invention concerns a composite film for production of moulded packaging according to the preamble of claim 1. Furthermore, the invention concerns a method for production of a composite film, a method for production of a moulded packaging and a moulded packaging.

A laminated film for production of moulded packagings according to the preamble of claim 1 is known under the trademark Formpack ^® by the applicant. Such a laminated film which is made up of several layers typically has a first plastic layer of OPA with a layer thickness of 25 μιη, an aluminium layer with thickness of 45 μηι to 60 μηι, and on the side of the aluminium layer opposite the OPA an HDPE, PP or PVC layer joined to the aluminium layer and with a typical thickness of 30 μιη to 100 pm. Such a layer structure, which has connecting layers between the individual layers, can be cold-formed so that recesses for moulded packaging in the form of blisters, in particular for pharmaceutical products such as tablets or capsules, can be formed which are then closed with a sealing film consisting for example of aluminium. This known laminated film has excellent barrier properties from the aluminium layer, in particular against vapour, air, light, oxygen etc., wherein the aluminium layer is not damaged or broken on cold-forming.

However, it has proved disadvantageous in practice that there are applications in which an increased stiffness of the laminated film is desirable in order to avoid bulging of the laminated film e.g. during transport or use of the moulded packaging by the end user.

It is furthermore known from the prior art that e.g. a plastic layer of PET with a thickness of between 500 pm and 700 pm has increased stiffness in comparison with the laminated film according to the preamble of claim 1. However, such a plastic layer has the disadvantage that as a result of its thickness, it can only be moulded into blisters by thermoforming, and in addition does not have the good barrier properties of the laminated film by the applicant cited initially. The object of the invention is therefore to refine a laminated film for production of moulded packaging according to the preamble of claim 1 such that this has increased stiffness in relation to the prior art and at the same time good barrier properties. This object is achieved with a laminated film for production of moulded packaging with the features of claim 1 in essence in that the second plastic layer is joined to a polyester layer by way of a connecting layer, and that the polyester layer has a thickness between 100 pm and 1000 pm, preferably a thickness between 200 pm and 300 pm. It has proved advantageous if the polyester layer comprises polyalkylene terephthalates such as polyethylene terephthalates, where applicable polybutylene terephthalates, polytetramethylene terephthalates or further polyesters, or contains these polymers. Typical polyalkylene terephthalates are A- PET, PETP, GPET or PEN. However, other thermoformable plastic films, such as PVC, PP, COC, nonwovens etc., can also be used.

In comparison with the conventional thicknesses of the PET layer which are known from the prior art, a value range is selected for the polyester layer thickness which lies clearly below the layer thicknesses normally used. In addition, in thermoforming damage to the aluminium layer serving as barrier layer in the laminated film is avoided so that the laminated film, while having a high stiffness, at the same time has unchanged good barrier properties.

Advantageous refinements of the laminated film according to the invention are given in the sub-claims.

It has proved advantageous in practice if the first plastic layer comprises polyolefins such as polyethylene or polypropylene and particularly advantageously HDPE, and has a thickness between 30 pm and 50 pm, in particular a thickness of around 40 pm, if the aluminium layer has a thickness between 25 pm and 100 pm, in particular a thickness of 50 pm, and if the second plastic layer comprises for example polyamides, preferably oriented polyamides (OPA) such as polyamide 6, polyamide 1 1 , polyamide 12, polyamide 6.6, polyamide 6.10 etc., and has a thickness between 15 pm and 35 pm, in particular a thickness of 25 pm. Other films of PP or PET can be used to support the tear-free nature of the aluminium layer.

The invention also comprises a method for production of a laminated film according to the invention. Here it is provided that the first layer structure is joined to the second plastic layer, for example by extrusion laminating, in particular however by means of a laminating or layering process. The surfaces of the individual layers, in particular films or foils, can be pre-treated by corona treatment and/or with a primer. The individual layers can be mutually joined with an adhesion promoting agent, adhesive, lacquer laminating adhesive, as a connecting layer. Typical adhesives are solvent-containing or solvent-free or watery acrylate adhesives or polyurethane adhesive systems.

The individual foils or films can be coloured and/or printed and/or back-printed.

Furthermore, the invention also comprises a method for production of a moulded packaging of a laminated film according to the invention, wherein the laminated film is formed by a thermoforming process into a moulded packaging with recesses to hold objects. Furthermore, it is provided that the recesses which are produced in this way and filled in particular with pharmaceutical products are then closed by sealing with a cover foil.

Further advantages, features and details of the invention arise form the description below of preferred embodiment examples and with reference to the drawing.

These show: Fig. 1 a cross section through a laminated film according to the invention for production of moulded packaging, and

Fig. 2 a partial region of a blister pack using a laminated film according to the invention in longitudinal section.

Figure 1 shows the fundamental structure of a laminated film 10 according to the invention. The laminated film 10 has a first plastic layer 1 1 which preferably comprises HDPE (high density polyethylene) and has a thickness between 30 pm and 50 μητι, in particular a thickness of around 40 pm.

Instead of HDPE as a first plastic layer 1 1 , other sealing layers can be used comprising PCV, PET, PP, modifications thereof and sealable lacquers with a thickness between 1 pm (for lacquers) and 200 pm.

The first plastic layer 1 1 is connected to the aluminium layer 13 acting as a barrier layer by way of a connecting layer 12 which in particular comprises a basis of polyurethane (PUR) and has a thickness for example of 3 pm. The aluminium layer 13 preferably has a thickness between 25 pm and 100 pm, preferably a thickness of around 50 pm. On the side of the aluminium layer 13 opposite the connecting layer 12 is a primer layer 15 with a thickness for example of 1 .6 pm and a connecting layer 16 with a thickness for example of 3.5 pm. The connecting layer 16 is connected to a second plastic layer 17 which preferably comprises OPA (oriented polyamide), wherein the second plastic layer 17 preferably has a thickness between 15 pm and 35 pm, in particular around 25 pm.

Layers 1 1 to 17 form a first layer structure 20 which in particular is connected by way of a laminating process with a PET layer 21 (polyethylene terephthalate) serving to increase the stiffness of the composite film 10, wherein between the PET layer 21 and the second plastic layer 17 is arranged a further connecting layer 22 with a thickness for example of 3.5 pm. The PET layer 21 has a thickness between 100 μιη and 1000 μητι, preferably a thickness between 200 pm and 300 pm. The laminated film 10 which is formed in this way serves for production of the moulded packagings 100 shown in part in figure 2. The moulded packagings 100 are in particular formed as so-called blister packs and serve to hold pharmaceutical products 1 such as tablets or capsules. For production or formation of the moulded packagings 100, the laminated film 10 according to the invention is moulded in a thermoforming process, wherein the laminated film 10 can be preheated for example to a temperature of around 160°C. In thermoforming, in the strip-like laminated film 10, recesses 5 are made in particular with even spacing next to or behind each other to hold the pharmaceutical products 1. After filling the recesses 5 with the pharmaceutical products 1 , the recesses 5 are closed with a sealing film 30 also comprising for example aluminium and acting as a cover film, in that the sealing film 20 is sealed onto the composite film 10 with the aid of heat and pressure. The laminated film 10 according to the invention can be modified or adapted in various ways without deviating from the inventive concept.

In particular the individual components of layers 11 to 17 may vary with regard to material and with regard to the thicknesses used in the embodiment examples described. Furthermore, it is evidently also conceivable that the moulded packagings 100 have a different shape or are suitable for holding objects other than pharmaceutical products 1. The use of connecting layers between the individual functional layers may be omitted, for example by direct extrusion of a plastic layer onto a carrier layer. List of Reference Numerals

1 Pharmaceutical product

5 Recess

10 Laminated film

11 First plastic layer

12 Connecting layer

13 Aluminium layer

15 Primer layer

16 Connecting layer

17 Second plastic layer

20 Layer structure

21 PET layer

22 Connecting layer

30 Sealing film

100 Moulded packaging