SK50152012A3 - Barrier packaging with barrier against external factors and method of manufacture - Google Patents

Abstract

The subject invention provides a barrier packaging with a barrier against such external factors, such as gas, water, odors that can be easily opened and is composed of a plastic support and a film covering cap (I) tightly connected to the edge of the pad (II), particularly by welding, characterized in that the foil covering caps (I) in the form of the film element comprises two layers of the film, the outer layer (1) sheet and a multilayer barrier film (2), wherein at least one surface of the multilayer barrier film (2) to form a first score line ( 3), and the outer surface of the sheet layer (1) is formed a second slot (4). In addition, the surface of the foil seal is a mark (5) for photocells. The subject invention also provides a method of making such containers.

Description

Technical field

The invention provides a barrier envelope with a barrier against external factors and a process for its manufacture. The new packaging can be used mainly in the food industry.

BACKGROUND OF THE INVENTION

In the industry, the barrier packaging is used to isolate the packaged product from the environment so that a closed atmosphere is formed around the product during the packaging process and remains there as long as possible to protect the product and thereby extend its service life (its expiration). The barrier packaging also protects the product against possible odors or environment penetrating from the outside of the packaging from the time it is packaged to the time the product is opened by the end user. Examples of such packages are packaging for meat or bakery products, which are packaged in a modified atmosphere to suppress the growth of bacteria or fungi.

Barrier packaging is known from the prior art and is not easily opened. Additional tools such as a knife or scissors (such as coffee bags) are required. Also known are containers which can be easily opened by a welded joint, such as, for example, containers with a tray for cheese or meat. This technology increases the cost of raw materials and slows down and complicates the packaging process in packaging machines. This also causes an increase in the amount of waste generated during packaging. In addition, the use of raw materials that easily break when welded will weaken the barrier properties of the wrap when welded.

According to the state of the art, there are no packages that provide a complete barrier while being easy to open. This problem is solved by the barrier packaging according to the invention and the method for its production.

SUMMARY OF THE INVENTION

A barrier wrapper according to the invention having a barrier against external factors such as gas, water, odors, which can be easily opened, formed from a plastic backing and a foil sealing cover tightly connected to the edge of the underlay particularly by welding, is characterized in that the foil sealing cover comprises two the film layers joined together, namely the outer film layer and the multilayer barrier film formed from the following layers, which are successively applied from the edge of the backing:

1. a layer of weldable material;

2. a first intermediate layer having a thickness greater than or equal to 0.5 µm, characterized in that it is easy to tear and provides an area necessary to maintain the cutting tolerance to prevent damage to the barrier layer;

3. A barrier layer with a thickness of 0.5 to 1.5 µm made of a material that provides a good barrier and is easily torn;

4. a second intermediate layer having a thickness greater than or equal to 0.5 µm and which can be easily torn and forms an area necessary to maintain the cutting tolerance, preventing damage to the barrier layer;

5. a laminating or printing layer, wherein at least one of the surfaces of the multilayer barrier film is provided with a first notch that does not weaken the barrier layer and a second notch is provided on the outer surface of the outer film layer and is covered with an adhesive coating where the second notch can easily be lifted to form the opening tab, wherein a portion of the multilayer barrier film within the first notch adjoins and is completely enclosed within a portion of the outer film within the second notch, and the surface area of the multilayer barrier film within the first notch is smaller or equally large as a surface area of a portion of the outer film layer within the second slit.

The barrier layer is preferably made of polyethylene, polyamide or ethylene vinyl alcohol, and the other layers are made of polyethylene, polypropylene, polyester and polyamide.

In another aspect, the invention provides a method of making a package, which according to the invention is characterized by:

1. making a multilayer barrier film by extrusion or lamination;

2. by extruding, on the outer foil layer and / or on the laminated or printed layer, preset fingerprints and photocell marks of the notch making machine and / or applying an anti-adhesive coating in the pre-register where the notch can be easily lifted, to form the opening tab;

3. feeding the multilayer barrier foil to the cutting device where a first notch is made according to the mark;

4. bonding the multilayer barrier film to the outer film layer by laminating or gluing;

5. after joining these elements into the film element, feeding the film element to a cutting device, wherein the film element is cut into strips of a preset size; which are then fed to a cutting device where a second indent is produced by means of a mark on the surface of the outer film layer;

6. then shaping, on packaging, welding or gluing machines, the packaging of the substrate and the foil sealing cover, in particular by joining the two elements together.

A printing machine, in particular a flexographic machine, in particular a soft packaging machine, in particular equipped with a pre-register, is preferably used for producing the impressions.

Preferably, a solvent-free laminating machine, a solvent-laminating machine or a coating machine are used to bond the multilayer barrier film to the outer film layer.

A disk cutting machine is preferably used to prepare the strips for cutting.

Rotary mechanical punching machines, flat mechanical punching machines or laser cutters are preferably used for cutting. The method according to claims 3 to 7, characterized in that vertical packaging machines, flowpack horizontal packaging machines and multivac horizontal packaging machines are used to connect the substrate to the foil sealing cover.

BRIEF DESCRIPTION OF THE DRAWINGS

An embodiment of the invention is shown in the drawings, wherein Figure 1 shows a barrier package according to the invention in an axonometric view. Figure 2 shows a cross-sectional view of the film of the foil seal at the point where the notch is made.

DETAILED DESCRIPTION OF THE INVENTION

The barrier package, which can be easily opened, made according to the invention, consists of a plastic backing (II) and a foil sealing cover (I) which is closely connected to the edge of the backing (II). The connection can be made by welding. The foil seal cover (I) comprises two interconnected foil layers, namely an outer foil layer (1) and a multilayer barrier foil (2) composed of the following layers applied successively from the edge of the underlay (II):

1. a layer (2a) of weldable material;

2. a first intermediate layer (2b) having a thickness greater than or equal to 0.5 µm, characterized in that it is easy to tear and provides an area necessary to maintain the cutting tolerance, preventing damage to the barrier layer (2c);

3. A barrier layer (2c) having a thickness of from 0.5 pm to 15 pm, made of a material that creates a good barrier and is easy to tear;

4. a second intermediate layer (2d) with a thickness greater than or equal to 0.5 µm, which is easily torn and forms an area necessary to maintain the cutting tolerance, preventing damage to the barrier layer (2c);

5. a laminating or printing layer (2e);

At least one surface of the multilayer barrier film (2) is provided with a first indent (3) that does not weaken the barrier layer (2c). And on the surface of the outer film layer (1) there is a second notch (4) which is covered with an adhesive coating at a point where the second notch (4) can be easily lifted to form a opening tab. A portion of the multilayer barrier film (2) within the first notch (3) adjoins a portion of the outer film layer (1) within the second notch (4) and is completely enclosed therein and the surface of the portion of the multilayer barrier film (2) within the first notch (3) is less than or equal to the area of a portion of the outer film layer (1) within the second slit (4).

The barrier layer (2c) is made of polyethylene, polyamide or ethylene vinyl alcohol, while the remaining layers are made of polyethylene, polypropylene, polyester and polyamide.

The packaging according to the invention is produced as follows:

1. A multilayer barrier foil (2) is produced by extrusion or lamination.

2. On the outer layer of the film (1) and / or on the laminated or printed layer (2e), preset fingerprints and marks (5) are printed for the photocell of the notch making device (3; 4) and / or for applying an anti-adhesive coating in the pre-register at a point where the notch can be easily lifted to form the opening tab. A flexographic printing machine equipped with a pre-register is used for this purpose. Coatings tested for this purpose and high temperature resistant coatings are applied to food product packaging.

3. The multilayer barrier foil (2) is fed to a cutting device where a first indent (3) is formed according to the mark (5). Rotary mechanical punching machines, flat mechanical punching machines or laser cutters are used for this purpose.

4. The multi-layer barrier film (2) is laminated or glued to the outer film layer (1). For this purpose, solvent-free laminating machines or solvent-laminating machines are used. A coating machine may also be used.

5. After joining these elements (1; 2) into the foil element, it is fed to a cutting device where the foil element is cut into strips of a predetermined size. For this purpose, a circular cutting machine is used. The strips are then fed to a cutting device where a second indent (4) is formed by means of a mark (5) on the surface of the outer film layer (1). Rotary mechanical punching machines, flat mechanical punching machines or laser cutters are used for this purpose.

6. A packaging composed of a support (II) and a foil sealing cover (I) is then formed on packaging, welding or gluing machines, in particular by joining the two elements together. For this purpose, vertical packaging machines, horizontal packaging machines of the flowpack type or horizontal packaging machines of the multivac type are used. The pad (II) can be made e.g. Polyethylene film. This may take the form of a thermoformed plastic tray.

Claims (8)

Patent claims Barrier package with a barrier against external factors such as gas, water, odors, which can be easily opened, consisting of a plastic backing and a foil sealing cover closely connected to the edge of the underlay, in particular by welding, characterized in that the foil sealing member comprises two interconnected film layers, namely an outer film layer (1) and a multilayer barrier film (2) composed of the following layers applied successively from the edge of the substrate (II): 1. a layer (2a) of weldable material; 2. a first intermediate layer (2b) having a thickness greater than or equal to 0.5 µm, characterized in that it is easy to tear and forms an area necessary to maintain the cutting tolerance, preventing damage to the barrier layer (2c); 3. A barrier layer (2c) having a thickness of from 0.5 pm to 1.5 pm, which is made of a material providing a good barrier and which is easy to tear; 4. a second intermediate layer (2d) having a thickness greater than or equal to 0.5 µm, which can be easily torn and forms an area necessary to maintain cutting tolerance, preventing damage to the barrier layer (2c); The laminating or printing layer (2e), wherein at least one of the surfaces of the multilayer barrier film (2) is provided with a first notch (3) that does not weaken the barrier layer (2c) and on the outer surface of the outer film layer (1) there is a second notch (4) which, at the point where the second notch (4) can be easily lifted to form the opening tab, is covered with an adhesive coating, wherein a portion of the multilayer barrier foil (2) within the first notch (3) abuts and wherein the surface area of the multilayer barrier film (2) within the first slit (3) is less than or equal to the surface area of the portion of the outer film layer (1). within the second notch (4). Packaging according to claim 1, characterized in that the barrier layer (2c) is made of polyethylene, polyamide or ethylene vinyl alcohol, and the other layers are made of polyethylene, polypropylene, polyester and polyamide. A method for producing a package according to claim 1, characterized by: 1. forming a multilayer barrier film (2) by extrusion or lamination; 2. by extruding, on the outer film layer (1) and / or on the laminated or printed layer (2e), preset fingerprints or marks (5) for the photocell of the notch making device (3; 4) and / or for applying an anti-adhesive paint in the pre-register at a point where the notch can easily be lifted to form the opening tab; 3. feeding the multilayer barrier film (2) to the cutting device, whereby a first indent (3) is formed by means of a mark (5); 4. bonding the multilayer barrier film (2) to the outer film layer (1) by laminating or gluing; 5. after joining these elements (1; 2) together into the foil element, by feeding the foil element to a cutting machine which cuts the foil element into strips of a predetermined size and these strips are fed to a cutting machine, where by means of a mark (5) on the surface an outer layer of film (1) forming a second indent (4); 6. then forming, wrapping, welding or gluing machines, a wrapper of the support (II) and of the foil seal cover (I), in particular by joining the two elements together. Method according to claim 3, characterized in that a printing machine, in particular a flexographic machine, in particular a machine for soft packaging, in particular a machine equipped with a pre-register, is used for producing the impressions. Method according to claims 3 to 4, characterized in that solvent-free laminating machines or solvent-laminating machines or coating machines are used to bond the multilayer barrier film (2) to the outer film layer (1). Method according to claims 3 to 5, characterized in that a disk cutting machine is used to prepare the strips for cutting. Method according to claims 3 to 6, characterized in that rotary mechanical punching machines, flat mechanical punching machines or laser cutters are used for cutting. Method according to claims 3 to 7, characterized in that vertical packaging machines, horizontal packaging machines of the flowpack type or horizontal packaging machines of the multivac type are used to connect the substrate (II) to the foil sealing cover (I).