PACKAGING BAG COMPRISING A PLASTIC FABRIC COMPOSITE

Abstract

A packaging bag is made of a plastic fabric composite with a tape fabric formed of intersecting film tapes and with an outer film comprising oriented polyolefin. An acrylate coating is incorporated in the plastic fabric composite, wherein the coating is arranged on the outer film, or an inner film of oriented polyolefin is provided between the outer film and the tape fabric, and the coating is arranged at least on one side of the inner film facing the outer film.

Claims

1. A packaging bag comprising a plastic fabric composite with a tape fabric formed of intersecting film tapes and with an outer film comprising oriented polyolefin, wherein an acrylate coating is incorporated in the plastic fabric composite, wherein the coating is arranged on the outer film, or an inner film of oriented polyolefin is provided between the outer film and the tape fabric, and the coating is arranged at least on one side of the inner film.

2. The packaging bag according to claim 1, wherein the acrylate coating is arranged between the outer film and the tape fabric.

3. The packaging bag according to claim 1, wherein the outer film and the tape fabric are extrusion-laminated through at least one intermediate layer.

4. The packaging bag according to claim 1, wherein the outer film has print on a side facing the tape fabric.

5. The packaging bag according to claim 4, wherein the print is arranged on the acrylate coating.

6. The packaging bag according to claim 1, wherein the coating is arranged on both sides of the inner film.

7. The packaging bag according to claim 1, wherein an adhesive layer is arranged between the inner film and the outer film or between the coating and the outer film.

8. The packaging bag according to claim 1, wherein the outer film and the tape fabric are extrusion-laminated through two intermediate layers, wherein a first intermediate layer directly adjoins the tape fabric and a second intermediate layer directly adjoins the coating or the inner film.

9. The packaging bag according to claim 8, wherein the first intermediate layer is formed from a polypropylene copolymer and the second intermediate layer is formed from a terpolymer.

10. The packaging bag according to claim 1, wherein the oriented polyolefin of the inner film and/or of the outer film is biaxially oriented.

11. The packaging bag according to claim 1, wherein the oriented polyolefin of the inner film and/or of the outer film is polypropylene.

12. The packaging bag according to claim 1, wherein the film tapes of the tape fabric are formed from polypropylene.

13. A use of an acrylate layer in a packaging bag for packaging animal foodstuff as barrier layer against the ingress of insects.

14. The use according to claim 13 with the provision that the acrylate layer is the only polar barrier layer.

15. The use according to claim 13 with the provision that the packaging bag is a single-material bag.

16. The use according to claim 13 with the provision that the packaging bag is formed so as to be based on polyethylene or polypropylene.

17. A method for the production of a plastic fabric composite (1) for a packaging bag according to claim 1, wherein a first film is supplied and is coated on at least one side with an acrylate, wherein a tape fabric is supplied subsequently and the one film is extrusion-laminated with the tape fabric via an intermediate layer.

Description

[0039] The invention will be described in the following referring to embodiment examples which are merely exemplary. The drawings show:

[0040] FIG. 1 a packaging bag according to the invention in a perspective schematic view;

[0041] FIG. 2 a layer construction of the plastic fabric composite;

[0042] FIG. 3 a layer construction of an alternative configuration of the plastic fabric composite;

[0043] FIG. 4 a layer construction of a further alternative configuration of the plastic fabric composite.

[0044] FIG. 1 shows, merely by way of example, a packaging bag which is formed from a plastic fabric composite 1 and which is set up and already filled. The detail shows the tape fabric 2 of intersecting film tapes 2a and 2b. This tape fabric 2 is arranged internally in the packaging bag. The packaging bag is tightly sealed against the environment by an outer film 3. The outer film 3 comprises a biaxially oriented polyolefin, e.g., polypropylene or polyethylene. The enlarged view of the detail further shows that, apart from the tape fabric 2 comprising intersecting film tapes 2a and 2b and the outer film 3, the film arranged outwardly over the tape fabric 2 is formed of a plurality of layers, and the outer film 3 is the outwardly terminating layer.

[0045] The layer construction shown already by way of example in FIG. 1 is made particularly clear by a comparison with FIG. 2.

[0046] FIG. 2 shows the layer construction of the plastic fabric composite 1 by a cross section through the material. First, the tape fabric 2 is arranged on the inside, while the outer film 3 is the terminating layer on the outer side. Print 4 is provided on the inner side of the outer film 3 and is applied directly to the outer film 3.

[0047] Due to the fact that the print 4 is arranged on the inner side of the outer film 3, the outer film 3 itself acts as a protective layer for the print 4 to prevent the print 4 from being damaged or worn off. In this way, it is ensured that the visual appearance of the packaging bag is not impaired, for example, as a result of transporting or due to prolonged storage, since this visual appearance is a key aspect in the consumer's purchasing decision.

[0048] Further, an inner film 5 is provided between the outside film 3 with the print 4 and the tape fabric 2. Like the outer film 3, the inner film 5 is also formed from an oriented polyolefin, e.g., polyethylene or polypropylene. This inner film 5 has, on both sides, a coating 6a, 6b with an acrylate so that this inner film 5 acts as carrier material for the coatings 6a, 6b. Acrylate coating 6a is arranged on a side of the inner film 5 facing the outer film 3 and coating 6b is arranged on a side of the inner film 5 facing the tape fabric 2. As a result of acrylate coatings 6a, 6b, the inner film 5 which is itself produced from a nonpolar polymer has a layer of a polar material, namely, acrylate, on both sides. A permeating damage to the plastic fabric composite 1 due to nonpolar solvents can be prevented by means of such a polar coating 6a, 6b of acrylate. That is, as a general rule, only nonpolar solvents can dissolve a nonpolar film layer and only polar solvents can dissolve a polar film layer so that in the case of a nonpolar solvent, for example, the dissolving process would be stopped at the latest at the coating 6a, 6b.

[0049] Therefore, for example, if an insect secretes a nonpolar secretion on the outer film 3, this would result in localized damage to the outer film 3. However, a dissolving of the plastic fabric composite 1 could then be stopped at the latest at coating 6a so that this insect would be prevented from penetrating into the interior of the packaging bag.

[0050] Further, the second coating 6b provides a two-fold protection insofar as, for example, coating 6a would be locally damaged through other influences, e.g., mechanical influences. In this case, the insects could cause damage to the inner film 5, but the dissolving process would be stopped at the latest at coating 6b.

[0051] Further, in order to connect the outer film 3 to the inner film 5 an adhesive layer 7 is provided which connects the two films 3, 5. Since the inner film 5 has a coating 6a, 6b of acrylate on both sides and the outer film 3 has an internal printing 4, the adhesive layer 7 is arranged between the print 4 and the outer acrylate coating 6a.

[0052] After producing the film composite comprising outer film 3, print 4, adhesive layer 7, coating 6a, inner film 5 and coating 6b, this film composite is fastened to the tape fabric 2. For this purpose, an intermediate layer 8 is provided, and an extrusion lamination of the film composite with the tape fabric 2 is carried out via this intermediate layer 8. To this end, the material of the intermediate layer 8 is introduced in molten liquid state between the film composite and the tape fabric 2 and is cooled accompanied by the application of pressure to both sides so that the initially molten liquid material of the intermediate layer 8 solidifies. This results in a laminating adhesion of the film composite to the tape fabric 2 so that the whole plastic fabric composite 1 can be formed in this way. An additional laminating strength is achieved in that the intermediate layer 8 at least partially penetrates into the tape fabric 2 in molten liquid state such that the contact surface between the intermediate layer 8 and the tape fabric 2 is made larger.

[0053] Polypropylene is particularly suitable as material for the intermediate layer 8 so that the outer film 3, inner film 5 and intermediate layer 8 can all be produced from the same material. Polypropylene is also preferably used for the film tapes 2a, 2b of the tape fabric 2 so that a single-material packaging can be formed in principle. Since the print 4, the adhesive layer 7 and the coatings 6a, 6b can be formed particularly thin, they make up only a very small proportion of the total material of the plastic fabric composite 1. Therefore, packaging or a packaging bag of this kind is still defined as single-material packaging. This has special advantages in the recycling process because there is no need to separate the individual polymer constituents. Nevertheless, a polar barrier layer or polar barrier layers which effectively prevent penetration by insects are embedded in the plastic fabric composite 1 by means of the thin coatings 6a, 6b of acrylate.

[0054] In this regard, FIG. 3 shows an alternative embodiment form of the plastic fabric composite 1 which dispenses with an inner film 5 as carrier material for the coatings 6a, 6b. Coating 6a is carried out directly on the outer film 3. Print 4 is first arranged on the outer film 3 and the acrylate coating 6a is then arranged on this print 4. For example, the coating 6a can be a printed, full-surface layer of an acrylate lacquer.

[0055] Because the inner film 5 is absent, an adhesive layer 7 can also be dispensed with so that the outer film 3 with the print 4 and the acrylate coating 6a is extrusion-laminated with the tape fabric 2 directly via an intermediate layer 8.

[0056] However, care must be taken that the intermediate layer 8 does not damage the acrylate coating 6a because, in contrast to the embodiment shown in FIG. 2, there is no second barrier layer or second acrylate coating 6b. However, in contrast to the embodiment shown in FIG. 2, the production process is simpler and there is less material used.

[0057] Further, it is conceivable that the intermediate layer 8 has not one, but two layers with a first intermediate layer and a second intermediate layer, and the individual intermediate layers can then be directly adapted to the material contacting them so that the best possible laminating adhesion is formed between the individual intermediate layers and the contacting material.

[0058] FIG. 4 shows the layer construction of a further alternative embodiment form. The individual layers conform to the embodiment form according to FIG. 3, although the layer sequence differs in the embodiments. Accordingly, the acrylate coating 6a directly adjoins the outer film 3. The print 4 is not provided directly on the outer film 3 but rather on the coating 6a. Therefore, during production, coating 6a is initially applied to the outer film 3. This can be carried out, for example, by applying an acrylate lacquer. Alternatively, the outer film 3 and acrylate coating 6a are coextruded. Only then is the print 4 carried out. The outer film 3 with the acrylate coating 6a and the print 4 is then fastened to the tape fabric 2 via an intermediate layer 8. In this case also, the intermediate layer 8 is an extrusion layer via which the outer film 3 is extrusion-laminated with the tape fabric 2.