WO2011047871A1

WO2011047871A1 - Perforated composite with a polyamide layer on the outer face thereof

Info

Publication number: WO2011047871A1
Application number: PCT/EP2010/006461
Authority: WO
Inventors: Michael Wolters; Günther LORENZ; Thomas Dintelmann; Roland Bothor
Original assignee: Sig Technology Ag
Priority date: 2009-10-22
Filing date: 2010-10-22
Publication date: 2011-04-28
Also published as: DE102009050419A1

Abstract

The invention relates to a container (3) that delimits an interior (1) from the surroundings (2), comprising at least one container wall (5) that has at least one edge (4), wherein the at least one container wall (5) is formed at least partly from a substrate (6); the substrate (6) is part of a flat composite (7); the flat composite (7) contains a polyamide layer (8) in addition to the substrate (6), said layer extending from the substrate to the surroundings (2); the polyamide layer (8) has one or more holes (10) along a line (9); the substrate (6) has a lower thickness (11) under said holes (10) than next to the holes (10), no thickness (11), or both. The invention also relates to a method for producing a closed, filled container.

Description

PERFORATED CONNECTION WITH AN EXTERNAL SIDE

POLYAMIDE LAYER

In general, the present invention relates to a container defining an interior to the environment with at least one container wall having at least one edge, wherein the at least one container wall is at least partially formed of a carrier layer, wherein the carrier layer is part of a sheet-like composite, wherein the sheet-like composite in addition to the carrier layer includes a polyamide layer projected from the carrier layer toward the environment. Furthermore, the invention generally relates to a method for producing a closed, filled container with at least one at least one edge-comprising sheet-like composite, comprising the steps: providing a sheet-like composite, comprising al. a carrier layer, and a2. a polyamide layer, forming the sheet-like composite to obtain an open container, filling the container with a food, closing the container to obtain the closed, filled container.

For a long time, the preservation of food, whether food for human consumption or animal food products by storing them in either a can or in a sealed glass with a lid. In this case, the durability on the one hand can be achieved, in each of which the food and the container, here glass or can separately sterilized as much as possible and then filled the food in the container and this is closed. In another approach, the food is filled into the glass or into the can and then sterilized by temperature treatment as far as possible and then closed the glass or can. In another approach, the food is filled into the jar or can and sealed. Subsequently, the sealed can or the closed glass with the food contained therein of a heat treatment, as

CONFIRMATION COPY Pasteurization, sterilizing or autoclaving, preferably autoclaving, usually with superheated steam, exposed to the food as well as the food-facing container inner walls such as the closure of the can or the lid of the glass on its food-facing side as much as possible sterilize. However, these long-term measures to increase the shelf life of food have a number of disadvantages. Cans and glasses have the disadvantage due to their substantially cylindrical shape that a very dense and space-saving storage is not possible. In addition, cans and glasses have a considerable weight, which leads to increased energy consumption during transport. In addition, for the production of glass, tinplate or aluminum, even if the raw materials used for this purpose come from recycling, a fairly high energy consumption is necessary. For glasses, aggravating an increased transport costs added. The glasses are usually prefabricated in a glassworks and then have to be transported using significant transport volumes to the food-filling operation. In addition, glasses and cans can be opened only with considerable effort or with the help of tools and thus rather cumbersome. With cans there is a high risk of injury due to sharp edges created during opening. When it comes to glasses, it often happens that when filling or opening the filled glasses, glass fragments enter the food, which in the worst case can lead to internal injuries when eating the food.

From the prior art another concept for storing long-lasting foods is known. In this case, containers are used, which are made of a multi-layered composite-like composite, often referred to as a laminate, are formed in which in particular stiff paper, cardboard or paperboard forms a relevant for the stability of these packages carrier layer. Such packaging is disclosed, for example, in WO 97/02140, which discloses a production method for a folded, heat and moisture-resistant container, which is produced by the so-called "hot fill" method (cf., Ullmann's Encyclopaedia of Industrial Chemistry, Vol. FOODS ", 2." Food Technology, 1988, pages 549 and 552, VCH Verlagsgesellschaft Weinheim). WO 97/02181 discloses another container made of a two-dimensional composite with cardboard as carrier layer. Here, such a container ter filled with food and autoclaved. Another container concept also belonging to this group of containers made of a laminar composite with cardboard as a carrier layer is disclosed in DE-OS 24 12 447. WO 03/059622 A2 also discloses a container concept comprising a sheet-like composite with cardboard as a carrier layer, which is used for autoclaving , In addition, JP-A-56-041136 describes a substantially composite outdoor polypropylene as a material for a composite which is autoclaved in the food-filled state.

Although laminates comprising polypropylene layers are particularly well suited for containers which are autoclaved in the filled state at temperatures above 120 ° C, such composites have disadvantages in connection with perforations for opening the containers. Thus, a fairly long thermal treatment of these composites is required in order to embrittle the polypropylene to a sufficient extent. As a result, overstretching of the polypropylene layers, which complicate the opening of the container along the perforation, reduced. The avoidance of such overstretching causes the container to open well and easily and, when the container is opened along the perforation, forms the most uniform edge, which in particular is free of plastic threads which adversely affect the pouring properties of the opened container. This long thermal treatment is particularly disturbing for small container sizes, which should be autoclaved as quickly as possible at high temperatures, since, although no longer required by the greatest possible sterilization of the food, quite long autoclaving times are required, which is disadvantageous for the food overcooking to lead.

Furthermore, polypropylene layers, in particular if they are provided in the outer region of a sheet-like composite, which is guided past another sheet-like composite, tend to form abrasion threads. This is disadvantageous in the processing of such composites, since a high cleaning effort of a production plant with production interruption and damage to the outer layer of the sheet-like composite is associated with it. In addition, a polypropylene layer has the disadvantage that only a few color systems can be used in order to achieve a color-fast printing of containers or the flat-bonded composites used for their production. This is in addition to the thread formation especially in the autoclaving under moving the container filled with food adversely.

In general, the object of the present invention is to at least partially overcome the disadvantages resulting from the prior art.

In addition, an object of the invention is to provide a container in which food can be stored as long as possible, which is stackable as possible to save space, which is possible without effort greater forces and use of tools with minimal risk of injury is good and beyond easy and in large quantities as possible without jetting and is suitable for problem-free Aufnahe of food.

In addition, an object of the invention is to provide a method for producing a possible without high force and without the use of a tool or large forces to open container that manages with as few steps and in which the particular associated with the area to be opened work steps itself as far as possible in the process for the preparation of the container incorporate.

Furthermore, an object of the invention is, in particular for single-person households, in which small container sizes of usually less than a liter smaller containers are necessary to provide containers that can be opened in addition to the most efficient method of production for a good and on the other apart from a good shelf life of the Have a good stackability.

A contribution to the solution of at least one of the above objects is afforded by the objects of the category-forming claims. The objects of the category-building Claims dependent dependent claims represent preferred embodiments of this solution contribution.

A contribution to the solution of at least one of the above objects is made by a container delimiting an interior space from the surroundings with at least one container wall having at least one edge,

wherein the at least one container wall is formed at least partially from a carrier layer;

wherein the carrier layer is part of a sheet-like composite;

wherein the sheet-like composite includes, in addition to the carrier layer, a polyamide layer projected from the carrier layer toward the environment;

wherein the polyamide layer has one or more holes along a line;

wherein the carrier layer under these holes has a smaller layer thickness than adjacent to the holes or no layer thickness or both.

The containers according to the invention preferably have between 6 and 16 edges, preferably between 7 and 12 edges. According to the invention, the term "edge" is understood in particular to mean regions which arise when folding a surface, which is the superimposition of two parts of this surface. As exemplary edges, the elongated contact areas of two wall surfaces of a substantially parallelepipedic container may be mentioned. Such a cuboid container usually has 12 edges. In the container according to the invention, the container walls preferably represent the surfaces of the container framed by the edges. The container walls of a container according to the invention are preferably at least 50, preferably at least 70 and more preferably at least 90% of their area from a carrier layer as part of the planar Compound formed.

In general, the carrier layer of the container according to the invention can be made of that material suitable for the purpose for the purpose, which has sufficient strength and rigidity to give stability to the container so that the container, when filled, substantially retains its shape. In addition to a number of plastics are on plants based fibrous materials, in particular pulps, preferably glued, bleached and / or unbleached pulps, with paper and board being particularly preferred.

In the container according to the invention, the carrier layer forms part of a sheet-like composite, which may also be referred to as a laminate and is often used in the form of a sheet, jacket or a long web in the manufacture of the container.

In its layer thickness under one of the holes in an embodiment according to the invention, the carrier layer can be reduced to such an extent that the carrier layer also has a hole. In this case, however, it is preferable that the composite composite is not broken completely under the hole or holes. This is usually achieved in that the layers which are also arranged under the support layer also provided with a hole, in particular a barrier layer of a water vapor or water and gas impermeable plastic or metal, preferably an aluminum layer, remain intact. This is particularly advantageous in connection with the food storage life of the container.

In another embodiment of the container according to the invention, the carrier layer has only a weakening in the areas of lesser layer thickness. In the case of weakening, it is preferred that the layer thickness below the hole or holes is at least 5%, preferably at least 30% or at least 50% or more preferably at least 70% less than the layer thickness of the backing layer adjacent to the weakening. In the case of weakening, it is further preferred that the layer thickness of the carrier layer in the region of the weakening has not less than 1%, preferably not less than 5% and particularly preferably not less than 10%, of the thickness of the carrier layer adjacent to the weakening. The weakening can be determined by cross-sectional images of the composite with subsequent measurement of the layer thicknesses.

In principle, the holes of the polyamide layer or the holes or weakenings in the carrier layer can have any form which appears suitable to the person skilled in the art for designing an area to be opened in the container according to the invention. However, in plan view, circular or oblong holes, which preferably extend along a line, are preferably used. fen, which forms a perforation in a container wall of the container according to the invention. It is also possible for the perforation as a whole to be formed as a linear weakening of the flat-shaped composite which, in the region of the weakening, has groups of sections with a smaller layer thickness compared to the weakening. In particular, this ensures that the container according to the invention can be opened without excessive force or even the aid of a tool with less risk of injury, in which the container wall of the erfiridungsgemäßen container is torn along the perforation thus formed.

Furthermore, in connection with the container according to the invention, it is preferable for it to be closable by a partial region of the container wall. This can be achieved, on the one hand, in that the corresponding area of the container wall can be closed by folding or bendable areas provided therein by pre-filling and creasing and fixing the folded-in portion of the container wall. The fixation for closing can be made so strong in the container according to the invention by sealing or gluing or a combination of these two measures that the container thus closed container is no longer open in this area readily and so a high food storage capacity is obtained. The opening before the use of the food along the perforation can be so much easier.

Furthermore, in connection with the container according to the invention, it is preferred that the holes of the line, which preferably form a linear perforation, are at least partially surrounded by a polyamide layer, the polyamide layer being bonded to at least one of the aluminum layers. This polyamide layer is preferably in the container according to the invention, based on the carrier layer to the outside of the container when it is closed. The polyamide layer, again based on the carrier layer, can be an outer or outermost layer of the container according to the invention. It is preferred that the polyamide layer, again based on the carrier layer, after a carrier layer, is provided as an outer or outermost, preferably as an outermost layer. In another embodiment, it is preferred that the polyamide layer at least 50%, preferably at least 70% and most preferably, the hole or holes of the line surrounds at least 90% of the hole edge. According to another embodiment, it is preferred that the polyamide layer is provided in at least 50%, preferably at least 70% and more preferably at least 90% of the outwardly facing surface in the finished container of the sheet-like composite used for a container according to the invention. In addition, further layers may be provided following the polyamide layer to the outside. These may be sealing layers or color layers of a color system or a combination of at least two of these layers.

In a further embodiment of the container according to the invention, it is preferred that the polyamide layer to at least 70 wt .-%, preferably at least 80 wt .-% and particularly preferably at least 95 wt .-%, each based on the polyamide layer, a thermoplastic polyamide (PA ) on. If the polyamide layer does not consist entirely of PA, the polyamide layer often contains other polymers or fillers, usually in an inorganic form, as a mixture with the PA. Furthermore, it is preferred according to the invention for the PA to be oriented, usually by stretching.

As PA, all PAs suitable for the production of and use in the containers according to the invention are considered. Particular mention should be made here of PA 6, PA 6.6, PA 6.10, PA 6.12, PA 11 or PA 12 or a mixture of at least two thereof, with PA 6 and PA 6.6 being particularly preferred and PA 6 furthermore being preferred, this being known under the trade names Akkulon ^® , Durethan ^® and Ultramid ^® commercially available. The molecular weight of the PA should preferably be selected so that the selected molecular weight range possesses, on the one hand, a good layer extrusion in the production of the laminar composite for the container according to the invention and, on the other hand, sufficiently good mechanical properties such as low elongation at break, high abrasion resistance and rigidity for the container itself , This results in preferred weight-average molecular weights in a range from 3 * 10 to 1 * 10 g / mol, preferably in a range from 5 * 10 to 1 * 10 g mol and more preferably in a range of 6 * 10 ³ to 1 * 10 ⁵ g / mol. In addition, in the context of the processing and mechanical properties, it is preferable that the PA has a density in a range of 1.01 to 1.40 g / cm 3, preferably in a range of 1.05 to 1.3 g / cm 3, and more preferably in a range of 1.08 to 1.25 g / cm ³ .

Furthermore, it is preferable that the polyamide layer has a basis weight in a range of

2 to 120 g / m 2, preferably in a range of 5 to 75 g / m 2 and more preferably in a range of 10 to 55 g / m. Furthermore, it is preferred that the polyamide layer has a thickness in a range from 10 to 100 μm, preferably a range from 15 to 75 μm, and particularly preferably in a range from 20 to 50 μm.

In another embodiment of the container according to the invention, it is preferred that at least 70% by volume, preferably at least 75% by volume and more preferably at least 80% by volume of the interior of the container is a food with an F ₀ value of 0 , 01 to 50 and preferably in the range of 2 to 45.

In addition, in another embodiment of the container according to the invention, the container wall is formed from a single carrier layer as part of the sheet-like composite. In this case, the container may for example also be formed in its side walls of a single carrier layer having flat composite, which is configured on its bottom and top with a lid and a bottom made of a different material. The same applies to the polyamide layer, and here too it is preferred that the container wall is formed from a single polyamide layer.

In another embodiment of the container according to the invention this is completely, preferably in one piece, formed from a single carrier layer as part of the sheet-like composite. The same applies to the polyamide layer, and here too it is preferred that the container according to the invention is formed from a single polyamide layer. This applies in particular to essentially parallelepipedic containers, also referred to as "bricks", as well as parallelepipedic containers which have a so-called "gable-top", usually for opening.

According to a further embodiment, the container according to the invention is particularly suitable in the closed state for the storage of food. Such closed These containers filled with foodstuffs according to the invention make it possible to store these foods for a particularly long time.

A further contribution to the solution of at least one of the objects according to the invention is afforded by a method for producing a closed, filled container having at least one sheet-like composite having at least one edge, comprising the steps:

a) providing a laminar composite comprising

al. a carrier layer; and

a2. a polyamide layer;

b) machining the polyamide layer to obtain at least one hole in the polyamide layer, such that the backing layer under this hole has a smaller layer thickness than adjacent to the hole;

c) forming the laminar composite to obtain an open container, the hole, with respect to the carrier layer, facing the container exterior;

d) filling the container with a food;

e) closing the container to obtain the closed, filled container.

The molding of the laminar composite and the preservation of an open container can be done by any method of operation that appears appropriate to the skilled person. In particular, the molding can take place in which, in its blank already taking into account the shape of the container, sheet-shaped container blanks are folded so that an open inventive container is formed via a jacket. This is usually done in that after folding this container blank whose longitudinal edges sealed to form a side wall or glued and one side of the shell by folding and further fixing, in particular sealing or gluing, is closed.

Another method initially forms by folding and sealing or gluing the overlapping butt edges a tubular structure with a fixed longitudinal seam. This tubular structure is laterally compressed, fixed and separated and also formed into an open container according to the invention by folding and sealing or gluing. Here, the food can be filled already after fixing and before separating.

The open containers thus obtained can be filled with food in a variety of ways. Here, it corresponds to an embodiment of the method according to the invention, that initially the open container and the food are sterilized as far as possible before filling. The closing of the container filled with food preferably takes place by folding and sealing or gluing the partial areas provided for this purpose in the open container, which preferably likewise consist of the carrier layer or the sheet-like composite. Instead of Siegeins means of a sealable plastic, it corresponds to a further embodiment of the method according to the invention, that other forms of attachment, for example by the use of a suitable adhesive, which is usually a functionalized polymer and thus in contrast to the physical binding of the Siegeins also to a chemical Compound contributes to be closed areas of the container according to the invention.

The statements made in connection with the container according to the invention also apply to the above method according to the invention. To the same extent important for the container according to the invention, the following also applies to the method according to the invention.

The provision of the sheet-like composite can be carried out by any measure which appears suitable to the person skilled in the art for the production of the container according to the invention. Thus, the sheet-like composites in the form of a long, mostly unrolled from a roll web, in the form of a tube or in the form of already taking into account the shape of the container in its blank mostly sheet-shaped container blank or shell done. In connection with the fan-shaped composite, it is preferable for the at least one barrier layer to be connected to the carrier layer via an adhesive layer. The sheet-like composite of any method which appears to be suitable for this purpose can be produced. It is particularly preferred in this context to process the individual layers with one another via a coextrusion process to form the sheet-like composite. The production of one or more holes in step b) of the method according to the invention can be carried out by any method suitable to the person skilled in the art for producing holes. Here, for example, punching, scribing, cutting or irradiation may be mentioned, with the irradiation, in particular the irradiation with a laser, being particularly preferred for producing the hole or the holes in the method according to the invention. When producing the holes by means of a laser, basically any laser which appears suitable for the production of the container according to the invention is considered. In this case, it is preferred that the production by means of a laser has at least one, preferably each of the following features:

LI a wavelength in the range of 0.1 to 15 μηι and more preferably in the range of 0.9 to 12 μηι into consideration;

L2 an output power in the range of 1 to 10,000 W, preferably in the range of 50 to 2,500 W.

In a further embodiment of the method according to the invention, the food in the closed, filled container is preserved to a Fo value νοηΟ, ΟΙ to 50 and preferably from 2 to 45. In another embodiment of the method according to the invention, the food in step d) has an F ₀ value of 0.01 to 50 and preferably of 2 to 45.

Furthermore, in one embodiment of the method according to the invention, preserving under a pressure of more than 1 bar, preferably at least 1, 2 bar and was also in a range of 1.3 to 4 bar at a temperature in a range of more 100 to 140 ° C, and preferably in a range of 105 to 135 ° C in the presence of water vapor. The duration of this preservation depends on the type, amount, volume, piece size and acidity of the food. In general, the conditions are chosen by the skilled person so that the desired F ₀ values are achieved. Most preservation takes place with a holding time over a range of 0.5 seconds to 90 minutes, preferably 2 to 60 minutes and more preferably 5 to 40 minutes. It has been particularly advantageous proven in the inventive method that the container is moved during preservation. By this movement, which may be, for example, a turning, tumbling and shaking, it is achieved that the most solid and liquid containing foodstuffs mixed in the container and in this way the best possible and rapid heat distribution in the food contained in the container is achieved and adherence of solidified food in the headspace of the filled closed erfindungemäßen container by local overheating is avoided. Suitable measures and apparatus for moving the container during preservation result, for example, from WO 2009/040347 A2.

The following invention exemplary figures show:

Figure 1 perspective view of a container according to the invention

Figure 2 shows a cross section through a sheet-like composite of an inventive

container

Figure 3 perspective view of an open container according to the invention

4 shows a cross section through a sheet-like composite of an inventive

container

5 shows a cross section through a further sheet-like composite of a container according to the invention

FIG. 1 shows the perspective view of a container 3 according to the invention which has a substantially parallelepipedal configuration and has a multiplicity of edges 4 which delimit the container walls 5 from one another and thus create an interior 1 which is delimited from the environment 2 by the container 3. The container walls 5 have a carrier layer 6, which is shown schematically as a cutout and passes through the entire sheet-like composite 7, which is made of cardboard. On the top of the container 3 along a line 9, a plurality of holes 10 are provided which form a perforation for easy opening of the container 3. The cross-section through a sheet-like composite 7 shown in FIG. 2 has a polyamide layer 8 which faces a first side 2, usually the outside of the container according to the invention, starting from the carrier layer 6. The polyamide layer 8 follows in the direction of the other, the interior 1 of the container 1 according to the invention later side facing carrier layer 4. On the turn, also later to the inside 1 of the container 3 according to the invention, an aluminum layer follows as a barrier layer 13. In the polyamide layer 8, a series of holes 10 is provided. Under these holes 10, the layer thickness 11 and lying within the hole edge 17 under the holes 10 areas of the support layer 6 with respect to the layer thickness outside the hole edges 17 is reduced or the support layer 6 pierced. However, the barrier layer 13 embodied here as an aluminum layer, for example, is intact in the regions of the holes 10, even if no further carrier layer 6 is provided.

Figure 3 shows the perspective schematic view of an open container 14, wherein the container wall 5 has a closable portion 12, which is delimited by a folding edge 18.

FIG. 4 shows a preferred embodiment of a planar composite used for the container according to the invention. A polyamide layer 8, a carrier layer 6, a first adhesion promoter layer 15a, an aluminum layer as the barrier layer 13 follow in the closed container from the outside to the inside. a second adhesion promoter layer 15b and an inner layer 16.

FIG. 5 shows a further embodiment of a sheet-like composite for a container according to the invention. In addition to the layers shown in FIG. 4, this has an additional layer 19 made of a plastic between the carrier layer 6 and the first adhesion promoter layer 15a.

Suitable adhesion promoters include, in particular, thermoplastic polymers, preferably polyolefins, in particular polyethylenes, and polypropylenes or a mixture thereof, which are functionalized in order to react with the respective layers adjacent to them via a chemical process. reaction to establish the strongest possible connection. Preferred adhesion promoters are polyethylene or polypropylene, which are each copolymerized with a functionality-bearing monomer, in particular maleic anhydride. Such adhesion promoters are Orevac ^®, Admer ^®, Lotader ^® or Plexar ^® used under the trade designations. It is also possible to mix different adhesion promoters with one another to form a primer blend.

The inner layer and the additional layer are preferably made of thermoplastic polymers. Here, in principle, all those skilled in the art for the preparation of a sheet-like composite, in particular when it is formed into a container which is a heat and moisture treatment, filled with or without food, into consideration. Suitable thermoplastic polymers are polymers obtained by chain polymerization, in particular polyolefins, preference being given to polycyclic olefin copolymers (POC), polyethylene and polypropylene. Also suitable as thermoplastic polymers are products of polycondensation reactions or polymer opening reactions, among which polyamides, polyesters and polyurethanes are particularly preferred. Preferred polyurethanes are thermoplastic polyurethanes, preferably having a weight average molecular weight in a range from 2,000 to 2,000,000 g / mol and more preferably from 4,000 to 50,000 g / mol. The polyurethanes preferably have a density in a range of from 1.01 to 1.40, and more preferably in a range of from 1.08 to 1.25 g / cm ³ . Such polyurethanes are commercially available under the tradename Elastogran. As the polyester, polybutylene terephthalate, polycarbonate, polyethylene terephthalate, polyethylene naphthalate and, preferably, polyethylene terephthalate are preferable. Polyesters have a weight average molecular weight in a range of 5,000 to 2,000,000 g / mol, and preferably in a range of 8,000 to 100,000 g / mol and densities in a range of 1.25 to 1.70, and preferably in a range of 1, 30 to 1.45 g / cm ³ . A typical commercially available polyester is CLEARTUF P60. In addition, mixtures of the polymers obtained by chain polymerization and the polymers obtained by polycondensation reactions or polymer ring opening reactions are suitable polymers according to the invention. However, polymers obtained by chain polymerization are preferred. In a further modification of the present invention, the adhesion promoters with the thermoplastic polymers are present as a mixture. Among the polyethlylenes, HDPE, LDPE, LLDPE, and PE and mixtures of at least two are preferred. Among the polypropylenes, isotactic, syndiotactic and atactic as well as mixtures of at least two are preferred. Among the polyesters, acrylic based ones are preferred. Generally, the thermoplastic polymers for the various layers of a laminar composite for making a container of the invention are selected to have a melting temperature above the temperature exposure to which the container is exposed in the process of the invention.

The sheet-like composites used for the containers according to the invention can be produced by methods familiar to the person skilled in the art, in particular by layer coextrusion.

Particularly preferred embodiments of sheet-like composites according to the invention result from the following tabular overviews:

Copolymer Copolymer Copolymer Copolymer Copolymer

REFERENCE LIST Interior

Environment / container outside

container

edge

container wall

backing

composite

polyamide layer

line

holes

layer thickness

subregion

barrier layer

Open container

Adhesive a, b, c

inner layer

hole edge

fold

additional layer

Claims

1. An inner space (1) to the environment (2) delimiting container (3) with at least one at least one edge (4) having container wall (5),

wherein the at least one container wall (5) is at least partially formed from a carrier layer (6);

wherein the carrier layer (6) is part of a sheet-like composite (7);

wherein the sheet-like composite (7) in addition to the carrier layer (6) includes a polyamide layer (8) projecting from the carrier layer toward the environment (2);

the polyamide layer (8) having one or more holes (10) along a line (9);

wherein the carrier layer (6) has a smaller layer thickness (11) under these holes (10) than adjacent to the holes (10) or no layer thickness (11) or both.

2. Container according to claim 1, wherein the container by a partial region (12) of the container wall (5) is closable.

3. A container according to claim 1 or 2, wherein the holes (10) of the line (9) are at least partially surrounded by the polyamide layer (8).

4. Container according to one of the preceding claims, wherein the polyamide layer (8) consists of at least 70 wt .-%, based on the polyamide layer (8), of a thermoplastic polyamide.

5. A container according to any one of the preceding claims, wherein at least 70 vol .-% of the interior of the container (3) constitutes a food having a Fo value of 2 to 50.

6. Container according to one of the preceding claims, wherein the container wall (5) from a single carrier layer (6) is formed as part of the sheet-like composite (7).

7. Container according to one of the preceding claims, wherein the container (3) is formed entirely of the carrier layer (6) as part of the sheet-like composite (7).

8. Container according to one of the preceding claims, wherein the container (3) is closed.

9. A method for producing a closed, filled container (3) with at least one at least one edge (4) having sheet-like composite (7), comprising the steps:

a) providing a sheet-like composite (7), including

al. a carrier layer (6); and

a2. a polyamide layer (8);

b) working the polyamide layer (8) to obtain at least one hole (10) in the polyamide layer (8), so that the carrier layer (6) under this hole (10) has a smaller layer thickness (11) than adjacent to the hole (10) ;

c) forming the sheet-like composite (7) to obtain an open container (3), the hole (10), with respect to the carrier layer (6), facing the container outer side (2);

d) filling the container (3) with a food;

e) closing the container (3) to obtain the closed, filled container (3).

10. A container according to claim 9, wherein at least one hole (10) is at least partially surrounded by the polyamide layer (8).

11. A container according to claim 9 or 10, wherein the polyamide layer (8) consists of at least 70 wt .-%, based on the polyamide layer (8), of a thermoplastic polyamide.

12. The method according to any one of claims 9 to 11, wherein the container (3) is formed from a one-piece support layer (6) as part of the fiatch-shaped composite (7).

13. The method according to any one of claims 9 to 12, wherein the container (3) is formed entirely of the carrier layer (6) as part of the sheet-like composite (7).

14. The method according to any one of claims 9 to 13, wherein the food in step d) has an F ₀ value of 0.01 to 50.

15. The method according to any one of claims 9 to 13, wherein the food is preserved in the closed and filled container (3) to an F ₀ -value of 0.01 to 50.

16. The method of claim 15, wherein the preserving is carried out under a pressure of more than 1 bar at a temperature in a range of more than 100 to 140 ° C in the presence of water vapor.

A method according to claim 16, wherein the container (3) is moved during preservation.

18. The method according to any one of claims 9 to 17, wherein the processing is performed by a laser.