Packaging material

FIELD: chemistry.

SUBSTANCE: invention relates to packaging materials and is meant for sealing containers. The container sealing is made from a composite film, having a polyester film/aluminium film/polyester film symmetrical structure.

EFFECT: disclosed container sealing has corrosion resistance, high resistance to puncture and breaking.

10 cl, 3 dwg, 3 ex

 

The invention relates to a packaging material, particularly designed for sealing containers.

Capping, which are used for packaging food products such as dairy products such as yogurt, cheese, cheese, juices, pastes, ground nuts, dip-sandwich spreads, ready-made sauces and the like, converted to the product side must be completed with quality, suitable for use in the food industry (compliance with the statutory regulations for food products).

From WO 98/26931 known packaging materials, which are converted to the Packed product side are coated with a rough surface deposited on a substrate material, and as the substrate material applied polymer material or aluminum, or a two-layer composite materials of aluminum/aluminum, aluminum/polymer material, the polymer material/aluminum, aluminum/paper or the like.

From WO 99/29508 known partially embossed elements closures for containers under the food, made of film material, which, in particular, may consist of the following three-layer composite combinations: aluminum/paper/polymeric material, aluminium/paper/aluminum or aluminum/polymer/aluminum.

However, aluminum is resistant to pack the products, such as, for example, yogurt, processed cheese, dairy products, juices, pastes, ground nuts, dip-sandwich spreads, ready-made sauces and the like.

Therefore, these three-layer composites on converted to the Packed product side in any case, should be provided on the entire surface by coating with a quality suitable for use in the food industry (compliance with the statutory regulations for food products).

In addition, in particular, during transport, packaging, closed aluminium capping, there is a danger of so-called "Flexcrack" (cracks forming under the action of bending), which occurs mainly due to the movement of the Packed product. This raises the bends in the aluminum layer capping capacity. These curves further lead to looseness of the Packed product can go out or deteriorate.

The present invention is the creation of a composite film for packaging material, in particular capping containers, which has improved resistance to puncturing and tearing, as well as excellent resistance to packaged product.

Therefore, the object of the invention is a composite film for packaging material, in particular capping containers, characterized in that the composite film is a symmetric composite of polymeric mater is Ala/aluminum/polymer material.

In addition, this composite film facing toward the product side can have a heat sealable coating.

As the polymer material in the proposed invention the composite is applied film, preferably made of polypropylene, polyethylene, polyamide, in particular, preferably of a tough polyester.

Between the two polymer films duplicated aluminum film with application of glue to duplicate.

It is preferable to use a known adhesive for duplication-based polyurethane.

The thickness of each of the polymer films can range from 3 to 100 μm, preferably from 10 to 30 microns.

The thickness of the aluminum layer, placed between the polymer films may be approximately 3-40 μm, preferably 6 to 15 μm.

Placing aluminum foil in symmetric composite between two polymer films provides the following benefits:

The composite has an absolute corrosion resistance and quality, suitable for use in the food industry (compliance with the statutory regulations for food products). In addition, in comparison with comparable composites or structures equipped with aluminium foil on the outside, the composite has superior resistance to puncturing and tearing.

Damage due to "Flexcrack" (cracks about azusena under the action of bending) are excluded; this damage prevents the polymer film deposited on the outer sides of the composite.

In addition, the aluminum film can be printed, with the use of printing inks as possible on the outside and on the inside, since the surface with printed coated with a polymer film, and the printing ink cannot come into contact with the Packed product.

When applying the staining of printing inks for printing on aluminum foil additionally can be obtained effects matte/gloss.

In addition, the manufacture of the composite film is more economical, as compared with the known compounds, fewer expensive aluminum foil (only one film instead of the previously used as the outer film composite of the two films).

The composite film may not have embossing or, at least, to have a partial embossing, allowing the separation of cutting film, for example, in the form of capping containers. If necessary, the surface can also be performed separators. Such separators in the form of expanding partial coatings are known, for example, from WO 01/68475. But you can also use as delimiters and other partial coatings deposited by a printing method.

The invention concerns also the capping capacity, representing a composite film having a symmetrical structure of the complex of polyester/aluminum/complex polyester, as a complex polyester preferably used polyethylene terephthalate (PET).

Below the invention is explained in more detail using the embodiments, examples, comparisons, and preferred embodiments of the proposed invention the composite film.

As a preferred variant implementation of the invention composite films figure 1 shows the capping 1 capacity of symmetric composite film consisting of a complex of the polyester/aluminum/complex polyester, this print representing the facial seal.

Figure 2 presents alternative 1' implementation of the present invention, the sealing capacity with overprinted 7' represents the interlayer printing.

Figure 3 shows a fragment I heat sealable lacquer layer 6, which is preferably performed by direct printing with a rough surface and consists of separators 8.

For the manufacture of the invention the closure 1 to the container, as shown in figure 1, the applied film of the complex of the polyester, preferably a film 2 made of polyethylene terephthalate with a thickness of the HH in the range from 10 to 30 μm. This PET film 2 on one side is covered with glue for duplication and use of this adhesive layer is connected with the aluminum film 3. The thickness of the aluminum film is, for example, in the range from 6 to 25 μm. On the free side of the aluminum film 3 is put another layer of glue 4 for duplication, joined by another PET film 2 with a thickness in the range from 10 to 30 μm. On the free side of the PET film 2 is applied to a heat sealable lacquer layer 6. On the opposite side is applied, as shown in figure 1, a printed layer 7, which can be applied by known printing methods such as gravure printing, flexographic printing, digital printing.

Capping the container 1', as shown in figure 2, is made as of manufacturing a composite material 5 consisting of an aluminum film 3, the adhesive 4 for duplication and polyester film 2, preferably of PET film. On the free side of the aluminum film 3 is applied with the method interlayer print printed layer 7'. On the free side of the printed layer 7' in turn can be applied with glue 4 for duplication, which is covered with another polyester film, preferably a PET film 2. Then, to provide the function of the capping containers on the side without the press to apply heat sealable lacquer layer 6.

Heat sealable lacquer is Loy 6, as shown in figure 3, may be made in the form of separators 8 with a rough surface. These separators 8 with a rough surface are used for the in between was the air that facilitates stacking usually stored in stacks of youporon containers 1, 1'. To further facilitate this process of stacking in heat sealable lacquer layer preferably added granular additives.

Other help when stacking is embossed as heat sealable lacquer layer 6 and sides 7 printed, with the preferred matrix is embossed. And these are obtained by stamping convexity also serve to facilitate stacking usually stored in stacks of youporon containers 1, 1'. Thanks to multi-layer symmetrical design of youporon containers 1, 1' their appearance does not deteriorate in the process of dot-matrix printing.

After this, the invention seals the container 1, 1' is compared with the known sheet workpiece for cups having a symmetrical structure made of aluminum/PET/aluminum. As can be seen from the table below, tested, respectively breaking load (N/15 mm)elongation (%) and resistance to puncturing in the measurement conditions using mandrel 9.5 mm and the holes 70 mm and the test results are compared with each other.

Design 1 PET 12/Al 15/PET 12 (the invention)

Design 2 PET 12/Al 25/PET 12 (the invention)

Design 3 Al 15/PET 12/Al 15 (prior art)

123
The breaking load, longitudinal73,9to 75.271,0
The breaking load, shear97,7104,771,5
Elongation, longitudinal116,0of 60.519,1
Elongation, shear78,658,022,3
Resistance to puncturing, Dorn 9.5 mm bore 70 mm109,2100,656,0

From the above table it is seen that the invention seals the container 1, 1' has a very high resistance to puncturing and tearing in comparison with the known and, symmetric structures composites. The measured values of the transverse breaking load are proof that prevented also commonly arise curves, the so-called "Flexcracks" (cracks forming under the action of bending). In addition, thanks to the use of a very durable film of polyethylene terephthalate resistance to puncturing in comparison with the known composite structures, such as structure 3 with outside aluminum film is greatly improved.

The invention symmetric composite construction allows also to obtain improved corrosion resistance, if in containers with food products stored aggressive packaged products and acidic compounds, or compounds which form acid gases. In this regard, a test was conducted such foods as cheese and deep-spreads, and the portion was Packed in known containers for food, sealed in a conventional aluminum film, and the other identical portion was useprivacy the invention capping containers 1, 1'. After four weeks of storage on aluminum capping was observed corrosion, in contrast to the invention of capping containers 1, 1' foci corrosion was not.

In addition, had the camping, the proposed invention the capping containers 1, 1' is a convenient way for consumers; thanks to the symmetrical design of composite prevents known susceptibility to twisting, in particular, even when the materials are applied to a relatively small thickness. A fact which is also often considered for disposal.

In addition, the proposed invention the sealing capacity has very good resistance to tearing, which, when opened, prevents the formation of sharp edges on detached pieces of film and therefore significantly reduce the risk of damage.

Because, according to the wishes of customers, often high demands are made to the appearance of the packaging material, such as capping of the containers, with the invention of capping containers 1, 1' it is also possible to perform this requirement, as located outside polyester film, preferably a film of polyethylene terephthalate, in particular, when applied to the print has shiny appearance. This visual effect slightest does not deteriorate even after the dot-matrix printing, because polymeric film is provided with sufficient elasticity during the printing process.

Flawless appearance can also be achieved in the case of interlayer printing ways is which additionally has the advantage he refers to the packaged product intermediate layer consisting of aluminum, glue for duplication, complex polyester and heat sealable lacquer layer, completely prevents the penetration of the printing ink in the packaged product. On the other hand, the printing ink is coated with a complex of the polyester, so often sensitive printing is protected from damage.

Summarizing, we can say that using the proposed invention, capping the container 1, 1' was found corresponding to the wishes of our customers a convenient solution packaging. This effect is achieved by using symmetric construction of a composite consisting of a polyester film, aluminum foil and polyester film. Especially preferred in this regard is to use polyethylene terephthalate (PET). Since the complex polyester, and consequently, a polyethylene terephthalate (PET) have stable tensile adhesion to termosvarivaemaya paints, the proposed invention capping containers are for welding the same properties as already known billet aluminum for cups. And yet, compared with them, it is also possible storage of acidic Packed product, as well as PET film have sufficient stability, in particular, to acids, and the e acidic gases.

1. Capping containers, made of a composite film having a symmetrical structure of the complex film of polyester/aluminum foil/film complex polyester.

2. Capping the container according to claim 1, characterized in that the film of the complex of the polyester comprises polyethylene terephthalate.

3. Capping the container according to claim 1, characterized in that the film thickness of the complex of the polyester is in the range from 3 to 100 μm, preferably from 10 to 30 microns.

4. Capping the container according to claim 1, wherein the aluminum film has a thickness of from 3 to 40 μm, preferably from 6 to 25 μm.

5. Capping the container according to claim 1, characterized in that the sealing capacity converted to the Packed product side provided with a seal representing a facial seal.

6. Capping the container according to claim 1, characterized in that the sealing capacity converted to the Packed product side provided with a seal representing the interlayer printing.

7. Capping the container according to claim 1, characterized in that the sealing capacity converted to the Packed product side provided with thermovalve paint layer.

8. Capping the container according to claim 7, characterized in that the heat sealable lacquer layer has a rough surface and is made in the form of geometrically ordered separators.

9. Capping the container according to claim 7 or 8, characterized in that the heat sealable lacquer layer contains granular additives.

10. Capping the container according to claim 1, characterized in that the sealing capacity is embossed on one or both sides.



 

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23 cl, 1 dwg, 1 tbl

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24 cl, 2 dwg

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18 cl

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7 cl, 2 dwg

FIELD: process engineering.

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11 cl, 2 tbl, 3 dwg, 2 ex

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EFFECT: enhanced adhesion between the polymeric and metallic surfaces.

4cl, 2 ex

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