DE102022122136A1 - Process for producing a barrier layer laminate, barrier layer laminate and container made from the barrier layer laminate - Google Patents

Abstract

The invention relates to a method for producing a barrier layer laminate, in particular for producing containers, wherein the following steps are carried out: - Providing an extrudable barrier layer material; - Providing a polyolefin; - Providing particles, in particular flakes or pellets, of layered plastic material, which by a comminution of existing or recycled extrudable barrier layer laminate is obtained; - mixing a portion of the polyolefin with the particles to produce a recycled plastic mixture; - feeding the barrier layer material, the polyolefin and the recycled plastic mixture into each extruder; and - performing a coextrusion of barrier layer material, polyolefin and recycled plastic mixture to produce a barrier layer laminate with the following layer sequence: 1) first outermost layer, namely a barrier outer layer; 2) embedded layer, namely layer of recycled plastic mixture; 3) the first outermost Layer arranged opposite the second outermost layer, namely polyolefin outer layer, as well as a barrier layer laminate produced using such a process and a container made from a barrier layer material.

Description

The invention relates to a method for producing a barrier layer laminate according to the preamble of claim 1, a barrier layer laminate according to the preamble of claim 14 and a container with/made of such a barrier layer laminate according to the preamble of claim 15.

Barrier layer laminates have been known from the prior art for some time. The term barrier layer laminates refers to laminates that have a barrier layer that is impermeable to gases. The structure of previous barrier layer laminates is based, according to the current state of the art, on the fact that such laminates have one or more barrier layers that are incorporated into the laminate structure or the layer structure of the remaining base laminate are integrated.

A disadvantage of these previously known barrier layer laminates is that a connection between the one or more barrier layers and the layers arranged adjacent to the barrier layer must, on the one hand, be very strong and stable in order to avoid delamination of the layers, but on the other hand This results in the barrier layers and the other layers of the laminate being practically impossible to separate from one another in a disadvantageous manner. The latter has an extremely disadvantageous effect, particularly when reusing or recycling products manufactured with such a barrier layer laminate, such as packaging or containers or their materials, and prevents effective recycling in most cases. This is essentially because the structuring base materials, such as polyethylene or polypropylene, from which such barrier layer laminates are made, are generally non-polar, while the barrier layer materials themselves, such as polyamide or ethylene vinyl alcohol copolymer, have polar groups.

The invention is based on the object of providing a method as well as a barrier layer laminate and a container produced with such a barrier layer laminate, through which the aforementioned problems are avoided and the reusability and recyclability of products containing such barrier layer laminates is improved compared to the previous state of the art.

This object is achieved by a method according to claim 1, by a barrier layer laminate according to claim 12 and by a container made from such a barrier layer laminate according to claim 13.

• - Bereitstellen eines extrudierbaren Barriereschichtmaterials;
• - Bereitstellen eines Polyolefins;
• - Bereitstellen von Partikeln, insbesondere Flocken oder Pellets, von geschichtetem Kunststoffmaterial, das durch eine Zerkleinerung von vorhandenem oder recyceltem extrudierbaren Schichtlaminat mit Barriereschicht erhalten ist;
• - Vermischen eines Teils des Polyolefins mit den Partikeln, um ein Recycling-Kunststoffgemisch herzustellen;
• - Zuführen des Barriereschichtmaterials, des Polyolefins und des Recycling-Kunststoffgemischs in jeweils einen Extruder; und
• - Durchführen einer Coextrusion von Barriereschichtmaterial, Polyolefin und Recycling-Kunststoffgemisch, um ein Barriereschichtlaminat mit folgender Schichtenfolge zu erzeugen:
  1. 1) erste äußerste Schicht, nämlich eine Barriereaußenschicht;
  2. 2) eingebettete Schicht, nämlich Schicht aus Recycling-Kunststoffgemisch;
  3. 3) der ersten äußersten Schicht gegenüberliegend angeordnete zweite äußerste Schicht, nämlich Polyolefinaußenschicht.

In particular, the object according to the invention is achieved by a method for producing a barrier layer laminate, in particular for producing containers, in which the following steps are carried out:

• - Providing an extrudable barrier layer material;
• - Providing a polyolefin;
• - Providing particles, in particular flakes or pellets, of layered plastic material obtained by comminution of existing or recycled extrudable layered laminate with a barrier layer;
• - Mixing a portion of the polyolefin with the particles to produce a recycled plastic blend;
• - Feeding the barrier layer material, the polyolefin and the recycled plastic mixture into an extruder; and
• - Carrying out a coextrusion of barrier layer material, polyolefin and recycled plastic mixture to produce a barrier layer laminate with the following layer sequence:
  1. 1) first outermost layer, namely a barrier outer layer;
  2. 2) embedded layer, namely layer made of recycled plastic mixture;
  3. 3) second outermost layer arranged opposite the first outermost layer, namely polyolefin outer layer.

An essential point of the invention is that in the method according to the invention for producing a novel barrier layer laminate, particles are used which are obtained by shredding existing or already recycled layer laminate with a barrier layer, such as a barrier layer laminate. An important point of the invention is that these particles, such as flakes or pellets, consist of a layered plastic material that itself already contains or contains a barrier layer.

By intensively mixing the particles with a structuring base material, such as polyethylene or polypropylene, which is used to produce the later desired products, which can be, for example, plastic containers with a barrier layer, and then feeding this mixture into an extruder, which is part of a coextrusion system To produce the desired barrier layer laminate, the different materials, i.e. H. the structuring base materials and the barrier layer material(s) are fused and connected to one another so intimately that, on the one hand, the structuring base material itself is already given a certain barrier layer effect and, on the other hand, polar/non-polar phase separation is effectively avoided.

Another important point of the invention is that the recycled plastic mixture obtained by intimately mixing the particles of existing barrier layer plastic material with original structuring base polymer material is sandwiched between a first outermost layer made of a barrier layer material and a second outermost layer arranged opposite the first outermost layer, which is a polyolefin outer layer made of the structuring base material, is extruded.

According to the invention, the recycled plastic layer thus fulfills several extremely advantageous tasks. The recycled plastic layer extruded between the first outermost barrier outer layer and the second outer layer made of polyolefin material opposite the first outer layer represents a type of compatibility agent between the polar first outer layer and the polar second outer layer, the inner recycled plastic layer simultaneously having the barrier layer effect due to its barrier layer material components first external barrier outer layer reinforced.

Another extremely advantageous effect of the method according to the invention and of the barrier layer laminate produced with it is that both the method according to the invention and the barrier layer laminate produced with it and, of course, in this context also the containers produced from this barrier layer laminate, are simple, very cost-effective and, moreover, extremely enable effective recycling of barrier layer laminates and in particular the barrier layer laminate produced according to the invention.

A further advantage of the method according to the invention and the products produced with it is that the recycled plastic layer is embedded between two pure layer materials, namely the barrier outer layer and the polyolefin outer layer, so that the barrier layer laminate produced according to the invention has precisely defined properties on the outside, namely those of the one used Barrier outer layer material on the one hand and on the other hand that of the polyolefin outer layer material used, and any inhomogeneities or possible impurities that may possibly be present in the recycled plastic layer are irrelevant to the manufactured product and do not appear.

According to one embodiment of the invention, as part of the coextrusion, an adhesion promoter layer is extruded between the barrier outer layer and the layer of recycled plastic mixture in order to produce a 4-layer barrier laminate, i.e. a barrier layer laminate with four layers.

According to this embodiment, the adhesion promoter layer itself represents a layer of the 4-layer barrier laminate, which is extruded from a separate extruder nozzle between the barrier outer layer and the layer of recycled plastic mixture. This adhesion promoter layer advantageously serves to improve adhesion between the outer barrier layer and the layer made of recycled plastic mixture.

According to a further embodiment of the invention, as part of the coextrusion, a further layer of polyolefin, namely a polyolefin intermediate layer, is extruded between the adhesion promoter layer and the layer of recycled plastic mixture in order to produce a 5-layer barrier laminate, i.e. a barrier layer laminate with five layers.

According to the invention, this polyolefin intermediate layer serves to structurally reinforce the barrier layer laminate to be produced.

According to the invention, the recycled plastic mixture has a particle content in the range from 30% by weight to 95% by weight, preferably in the range from 45% by weight to 80% by weight and particularly preferably in the range from 55% by weight to 75% by weight.

Since these particles, which are present in particular in the form of flakes or pellets, themselves already represent recycled plastic material that has barrier layer components, such as ethylene vinyl alcohol copolymer and/or polyamide, a particle proportion in the range of 30% by weight to 95% by weight reflects, preferably in the range from 45% by weight to 80% by weight and particularly preferably in the range from 55% by weight to 75% by weight, the very high recycling capacity of the method according to the invention, since the method according to the invention is suitable for a barrier layer material to produce a product that consists of over half to three quarters of recycled material. By means of the method according to the invention, it is therefore possible to produce a barrier layer material as good as new, which consists mainly of recycled components.

According to a further embodiment of the invention, the polyolefin outer layer can have an additive and/or a dye with the following proportions by weight of the total weight: 4-layer barrier laminate 5-layer barrier laminate Additive 11.2 ± 5% by weight, preferred - 4-layer barrier laminate 5-layer barrier laminate ± 4% by weight and particularly preferably ± 3% by weight dye 10.0 ± 0.5% by weight, preferably ± 0.4% by weight and particularly preferably ± 0.3% by weight 7.4 ± 0.5% by weight, preferably ± 0.4% by weight and particularly preferably ± 0.3% by weight

According to a further embodiment of the invention, the dye content of the polyolefin outer layer can also be in a range from 0 to 10% by weight, preferably in a range from 0.1 to 9% by weight, both in the 4-layer barrier laminate and in the 5-layer barrier laminate. % and particularly preferably in a range from 0.01 to 8% by weight, with a weight percentage of 0% by weight being particularly advantageous for a dye-free polyolefin outer layer and / or a dye-free barrier layer laminate. “Dye-free” is understood to mean a dye-free polyolefin outer layer or the “natural” color of the barrier layer laminate resulting from the layer sequence of the barrier layer laminate and its components, which does not contain any explicitly added dye.

According to a preferred embodiment of the invention, a polyethylene modified with maleic anhydride is used as an additive, the use of such an additive allowing mixing and homogenization of the non-polar base polymer, i.e. H. Polyethylene and/or polypropylene, with the polar barrier layer material, i.e. H. Polyamide and / or ethylene vinyl alcohol copolymer, so that, for example when using HDPE as the base polymer and polyamide or ethylene vinyl alcohol copolymer as the barrier layer material, after an initial mechanical mixing and subsequent heating in the extruder, a unique material mixture is created that is homogeneously mixed and shows no phase separation , so that products made from it have similar characteristics, in particular in terms of their physical, mechanical and other properties, as if pure HDPE had been used to make these products, so that this HDPE barrier layer material mixture can be used as a replacement and/or like HDPE.

According to a further embodiment of the invention, the polyolefin intermediate layer has an additive and/or a dye with proportions by weight of the total weight that are in the following range: 8.6 ± 5% by weight, preferably 6 ± 4% by weight and particularly preferably 2 .3 ± 2% by weight.

According to a further embodiment of the invention, the dye content of the polyolefin intermediate layer can also be in a range from 0 to 9% by weight, preferably in a range from 0.1 to 6% by weight, both in the 4-layer barrier laminate and in the 5-layer barrier laminate. % and particularly preferably in a range from 0.01 to 2% by weight, with a weight percentage of 0% by weight for one dye-free polyolefin intermediate layer and/or a dye-free barrier layer laminate is particularly advantageous. “Dye-free” is understood to mean a dye-free polyolefin intermediate layer or the “natural” color of the barrier layer laminate resulting from the layer sequence of the barrier layer laminate and its components, which does not contain any explicitly added dye.

Furthermore, the barrier layer laminate consists of layers with the following weight proportions of the total weight: layer 4-layer barrier laminate 5-layer barrier laminate Barrier outer layer 12 ± 6% by weight, preferably 10 ± 5.5% by weight and particularly preferably 7 ± 5% by weight 12 ± 6% by weight, preferably 10 ± 5.5% by weight and particularly preferably 7 ± 5% by weight Adhesion promoter layer 12 ± 6% by weight, preferably 10 ± 5.5% by weight and particularly preferably 7 ± 5% by weight 12 ± 6% by weight, preferably 10 ± 5.5% by weight and particularly preferably 7 ± 5% by weight Polyolefin interlayer - 50 ± 20% by weight, preferably 30 ± 15% by weight and particularly preferably 25 ± 10% by weight Layer made of recycled plastic mixture 69.5 ± 40% by weight, preferably 50 ± 40% by weight 69.5 ± 40% by weight, preferably 50 ± 40% by weight layer 4-layer barrier laminate 5-layer barrier laminate and particularly preferably 40 ± 30% by weight and particularly preferably 40 ± 30% by weight Polyolefin outer layer 40 ± 30% by weight, preferably 35 ± 25% by weight and particularly preferably 30 ± 20% by weight 40 ± 30% by weight, preferably 35 ± 25% by weight and particularly preferably 30 ± 20% by weight

According to a further advantageous embodiment of the invention, the polyolefin is a polyethylene with a density in the range from 0.94 g/cm ³ to 0.97 g/cm ³ , preferably in the range from 0.95 g/cm ³ to 0.97 g /cm ³ and particularly preferably in the range from 0.951 g/cm ³ to 0.961 g/cm ³ , and preferably HDPE.

Furthermore, according to one embodiment of the invention, polyamide and/or ethylene vinyl alcohol copolymer (EVOH) is preferably used as the barrier layer material.

Furthermore, according to a preferred embodiment of the invention, a maleic anhydride-modified polyethylene with a density of greater than 0.800 g/cm ³ , preferably with a density in the range from 0.800 g/cm ³ to 0.935 g/cm ³ and optionally as an adhesion promoter is used as an additive Maleic anhydride-modified polyethylene with a density of greater than 0.800 g/cm ³ , preferably with a density in the range of 0.800 g/cm ³ to 0.935 g/cm ³ , particularly preferably with a density in the range of 0.921 ± 0.015 g/cm ³ is used.

Furthermore, the object according to the invention is also achieved by a barrier layer laminate which is produced using a method according to the above statements.

Furthermore, the object according to the invention is also achieved by a container which is made from a barrier layer material according to the above statements.

As part of the method according to the invention, the components of a separate layer of the barrier layer material to be produced are placed in a separate extruder and change into a molten pasty state due to heating, friction and transport in the extruder, so that a homogeneous one is formed within each extruder Mass is created that can be processed into well-distributed and defined layers. The respective layers are combined in a coextrusion machine, which, depending on whether 4-layer barrier laminates or 5-layer barrier laminates are to be produced, has four or five extruders that open into a common coextrusion head, on which a preform with coherent layers of a defined thickness is formed .

To produce a container made of such a barrier layer material, the preform from the previous process is placed in an unmolten state in a steel/aluminum mold, which is cooled with cold water at temperatures between 8 ° C and 15 ° C in order to form the preform with a predetermined Design to form and cool, with the formed container changing from a pasty state to a solid state. The shaping is carried out by blowing compressed air at a pressure in the range of 7 to 10 bar into the preform for a certain time so that the manufactured product undergoes the correct shaping and solidification and thus takes on the shape of the mold.

Barrier layer laminates produced with the method according to the invention and products made therefrom, such as containers, can be crushed after use and ground into flakes or pellets, which can be completely reused for a new production of a barrier layer laminate using the method according to the invention, so that practically no material loss or waste occurs. These flakes or pellets can then be fed directly back into the manufacturing process according to the invention or stored for future use, so that again there is no loss of material or waste and the material of the barrier layer laminate produced can be reused in a closed circuit.

An important point in the process according to the invention is that the flakes produced in the previous process have well-defined, separated and additive-provided layers. In order for homogenization and compatibilization to take place, the materials must be mixed. With the correct heating and pressure, the additive maleic anhydride (MA) reacts with the non-polar residue in polyethylene and the polar part in EVOH and/or polyamide, thereby improving miscibility and reducing surface tension, thereby dispersing the materials together is facilitated and improved and the mixture acquires properties similar to those of an HDPE with dispersed molecules of the amine group, whereby the good recycling properties of the barrier layer laminate according to the invention are achieved.

With the help of an extruder, the material, i.e. the flakes or pellets, is picked up through a hopper so that the extrusion process with the right temperature, the right LD ratio and the right compression can produce the repelletizing material that is used for the next process, i.e. recycling cycle, is ready.

The method according to the invention thus solves the problem of using the pellets produced in the previous method as starting material for the production of a new barrier layer material, or a new packaging. In this case, the granules obtained from the barrier layer laminate are fed to a blower in a proportion of, for example, 70% by weight of the total packaging, while in this example the remaining 30% by weight is virgin HDPE. Since amine groups of polyamide chains and/or hydroxy residues of EVOH are present dispersed in the barrier layer laminate granules, it is possible to mix or homogenize the granules with new HDPE, resulting in a unique mixture without phase separation, which has similar properties to HDPE and thus can be used to produce new packaging with the same physical, mechanical and performance properties as packaging made from new raw material or even PCR-HDPE (Post Consumer Recycled HDPE).

Further embodiments of the invention result from the subclaims.

The invention is described in more detail below using exemplary embodiments.

Barrier layer laminates according to the invention are described below, which can be used in the form of 4-layer barrier laminates and 5-layer barrier laminates for the production of containers, for example with a capacity of four liters, 10 liters or even 20 liters, but also for all other desired volumes.

• • strukturgebendes Basispolymer HDPE (High density Polyethylen) mit einer Dichte im Bereich von 0,951 g/cm³ bis 0,961 g/cm³,
• • Barriereschichtmaterial EVOH (Ethylenvinylalkoholcopolymer) mit einer Dichte von 1,19 g/cm³ oder ein Polyamid mit einer Dichte im Bereich von 1,05 g/cm³ bis 1,06 g/cm³,
• • Haftvermittler ein mit 0,2% modifiziertes LDPE (Low density Polyethylen) mit einer Dichte von 0,921 g/cm³,
• • Additiv ein mit 0,9% modifiziertes VLDPE (Very low density Polyethylen) mit einer Dichte von 0,875 g/cm³,

eingesetzt. Der verwendete Farbstoff liegt hinsichtlich seiner Dichte im Bereich der vorgenannten Substanzen.According to the invention, in the exemplary embodiments described as

• • structural base polymer HDPE (high density polyethylene) with a density in the range of 0.951 g/cm ³ to 0.961 g/cm ³ ,
• • Barrier layer material EVOH (ethylene vinyl alcohol copolymer) with a density of 1.19 g/cm ³ or a polyamide with a density in the range of 1.05 g/cm ³ to 1.06 g/cm ³ ,
• • Adhesion promoter: 0.2% modified LDPE (low density polyethylene) with a density of 0.921 g/cm ³ ,
• • Additive a 0.9% modified VLDPE (very low density polyethylene) with a density of 0.875 g/cm ³ ,

used. The density of the dye used is in the range of the aforementioned substances.

According to the invention, these substances are added to the extruders assigned to them according to the exemplary embodiments mentioned below and extruded at temperatures in the range from 170 ° C to 250 ° C, preferably 190 ° C to 230 ° C, as part of a coextrusion to form the desired barrier layer laminate .

As part of this core extrusion, three-dimensional preforms can be produced, which, after cooling to a temperature in the range of 8 ° C to 15 ° C, are blown in a further step in a blow mold surrounding the preforms with compressed air and a pressure in the range of seven to ten bar be inflated into a desired container with a desired geometry.

The weight proportions in the tables below are given in grams.

Example 1

4-layer barrier laminate extruder raw material Weight share Percentage Extruder 1 Barrier outer layer, namely polyamide 82.6 7.00% Extruder 2 Adhesion promoter layer 47.2 4.00% Extruder 3 ground recycled plastic mixture 821.28 69.60% Extruder 4 pure, i.e. virgin base polymer 173.47 14.70% Additive 31.85 2.70% dye 23.6 2.00% 1180 100.00%

Example 2

4-layer barrier laminate extruder raw material Weight share Percentage Extruder 1 Barrier outer layer, namely polyamide 30.72 6.00% Extruder 2 Adhesion promoter layer 17.92 3.50% Extruder 3 ground recycled plastic mixture 358,912 70.10% Extruder 4 pure, i.e. virgin base polymer 84.48 16.50% Additive 9,728 1.90% dye 10.24 2.00% 512 100.00%

Example 3

4-layer barrier laminate extruder raw material Weight share Percentage Extruder 1 Barrier outer layer, namely polyamide 15.6 6.00% Extruder 2 Adhesion promoter layer 9.1 3.50% Extruder 3 ground recycled plastic mixture 182.39 70.10% Extruder 4 pure, i.e. virgin base polymer 42.8 16.50% Additive 4.91 1.90% dye 5.2 2.00% 260 100.00%

Example 4

4-layer barrier laminate extruder raw material Weight share Percentage Extruder 1 Barrier outer layer, namely EVOH 8.64 8.00% Extruder 2 Adhesion promoter layer 4.32 4.00% Extruder 3 ground recycled plastic mixture 73.47 68.00% Extruder 4 pure, i.e. virgin base polymer 16.75 15.50% Additive 2.66 2.50% dye 2.16 2.00% 108 100.00%

Example 5

5-layer barrier laminate extruder raw material Weight share Percentage Extruder 1 Barrier outer layer, namely polyamide 82.60 7.00% Extruder 2 Adhesion promoter layer 47.2 4.00% Extruder 3 pure, i.e. virgin base polymer 263.14 22.30% Additive 31.86 2.70% Extruder 4 ground recycled plastic mixture 436.6 37.00% Extruder 5 pure, i.e. virgin base polymer 295 25.00% dye 23.6 2.00% 1180 100.00%

Example 6

5-layer barrier laminate extruder raw material Weight share Percentage Extruder 1 Barrier outer layer, namely polyamide 33.72 6.00% Extruder 2 Adhesion promoter layer 19.67 3.50% Extruder 3 pure, i.e. virgin base polymer 129,822 23.10% Additive 10,678 1.90% Extruder 4 ground recycled plastic mixture 216.37 38.50% Extruder 5 pure, i.e. virgin base polymer 140.5 25.00% dye 11.24 2.00% 562 100.00%

Example 7

5-layer barrier laminate extruder raw material Weight share Percentage Extruder 1 Barrier outer layer, namely polyamide 15.60 6.00% Extruder 2 Adhesion promoter layer 9.1 3.50% Extruder 3 pure, i.e. virgin base polymer 60.06 23.10% Additive 4.94 1.90% Extruder 4 ground recycled plastic mixture 100.1 38.50% Extruder 5 pure, i.e. virgin base polymer 65 25.00% dye 5.2 2.00% 260 100.00%

At this point it should be noted that all parts described above are viewed on their own and in any combination, especially the details shown in the drawings, are claimed to be essential to the invention. Modifications to this are familiar to those skilled in the art.

Claims (15)

Method for producing a barrier layer laminate, in particular for producing containers, characterized by the following steps: - Providing an extrudable barrier layer material; - Providing a polyolefin; - Providing particles, in particular flakes or pellets, of layered plastic material obtained by comminution of existing or recycled extrudable layered laminate with a barrier layer; - Mixing a portion of the polyolefin with the particles to produce a recycled plastic blend; - Feeding the barrier layer material, the polyolefin and the recycled plastic mixture into an extruder; and - performing a coextrusion of barrier layer material, polyolefin and recycled plastic mixture to produce a barrier layer laminate with the following layer sequence: 1) first outermost layer, namely a barrier outer layer; 2) embedded layer, namely layer made of recycled plastic mixture; 3) second outermost layer arranged opposite the first outermost layer, namely polyolefin outer layer. Procedure according to Claim 1 , characterized in that , as part of the coextrusion, an adhesion promoter layer is extruded between the barrier outer layer and the layer of recycled plastic mixture in order to produce a 4-layer barrier laminate. Procedure according to Claim 2 , characterized in that , as part of the coextrusion, a further layer of polyolefin, namely a polyolefin intermediate layer, is extruded between the adhesion promoter layer and the layer of recycled plastic mixture in order to produce a 5-layer barrier laminate. Method according to one of the preceding claims, characterized in that the recycled plastic mixture has a particle content in the range from 30% by weight to 95% by weight, preferably in the range from 45% by weight to 80% by weight and particularly preferably in the range of 55% by weight to 75% by weight. Method according to one of the preceding Claims 2 until 4 , characterized in that the polyolefin outer layer has an additive and/or a dye with the following proportions by weight: 4-layer barrier laminate 5-layer barrier laminate Additive 11.2 ± 5% by weight, preferably ± 4% by weight and particularly preferably ± 3% by weight - 4-layer barrier laminate 5-layer barrier laminate dye 10.0 ± 0.5% by weight, preferably ± 0.4% by weight and particularly preferably ± 0.3% by weight 7.4 ± 0.5% by weight, preferably ± 0.4% by weight and particularly preferably ± 0.3% by weight Method according to one of the preceding Claims 2 until 4 , characterized in that the polyolefin outer layer has no added dye. Method according to one of the preceding Claims 3 until 6 , characterized in that the polyolefin intermediate layer has an additive and/or a dye with the following proportions by weight: 8.6 ± 5% by weight, preferably ± 4% by weight and particularly preferably ± 3% by weight. Method according to one of the preceding Claims 3 until 6 , characterized in that the polyolefin intermediate layer has no added dye. Method according to one of the preceding Claims 2 until 8th , characterized in that the barrier layer laminate consists of layers with the following weight proportions: 4-layer barrier laminate 5-layer barrier laminate Barrier outer layer 12 ± 6% by weight, preferably 10 ± 5.5% by weight and particularly preferably 7 ± 5% by weight 12 ± 6% by weight, preferably 10 ± 5.5% by weight and particularly preferably 7 ± 5% by weight Adhesion promoter layer 12 ± 6% by weight, preferably 10 ± 5.5% by weight and particularly preferably 7 ± 5% by weight 12 ± 6% by weight, preferably 10 ± 5.5% by weight and particularly preferably 7 ± 5% by weight 4-layer barrier laminate 5-layer barrier laminate Polyolefin intermediate layer - 50 ± 20% by weight, preferably 30 ± 15% by weight and particularly preferably 25 ± 10% by weight Layer made of recycled plastic mixture 69.5 ± 40% by weight, preferably 50 ± 40% by weight and particularly preferably 40 ± 30% by weight 69.5 ± 40% by weight, preferably 50 ± 40% by weight and particularly preferably 40 ± 30% by weight Polyolefin outer layer 40 ± 30% by weight, preferably 35 ± 25% by weight and particularly preferably 30 ± 20% by weight 40 ± 30% by weight, preferably 35 ± 25% by weight and particularly preferably 30 ± 20% by weight Method according to one of the preceding claims, characterized in that the polyolefin is a polyethylene with a density in the range from 0.94 g/cm ³ to 0.97 g/cm ³ , preferably in the range from 0.95 g/cm ³ to 0 .97 g/cm ³ and particularly preferably in the range from 0.951 g/cm ³ to 0.961 g/cm ³ , and preferably HDPE. Method according to one of the preceding claims, characterized in that polyamide or ethylene vinyl alcohol copolymer (EVOH) is used as the barrier layer material. Method according to one of the preceding Claims 5 until 8th , characterized in that a polyethylene modified with maleic anhydride with a density of greater than 0.800 g/cm ³ , preferably with a density in the range from 0.800 g/cm ³ to 0.935 g/cm ³ , is used as an additive. Method according to one of the preceding Claims 5 until 8th , characterized in that the adhesion promoter is a polyethylene modified with maleic anhydride with a density of greater than 0.800 g/cm ³ , preferably with a density in the range from 0.800 g/cm ³ to 0.935 g/cm ³ , particularly preferably with a density in the range of 0.921 ± 0.015 g/cm ³ is used. Barrier layer laminate produced using a method according to one of the preceding claims. Container made from a barrier layer material Claim 14 .