KR102207230B1 - pouch film for liquor packaging - Google Patents

Abstract

The present invention relates to a pouch film for packaging alcoholic beverages. More particularly, the present invention relates to a pouch film for packaging alcoholic beverages that can store alcoholic beverages for a long period of time by preventing the alcohol component from being discharged to the outside due to excellent gas barrier properties. According to the present invention, the pouch film for packaging alcoholic beverages comprises: an inner cover in contact with a liquid alcoholic beverage containing alcohol; and an outer cover which is coupled to an upper portion of the inner cover and formed thinner than the inner cover and blocks the passage of gas.

Description

Pouch film for liquor packaging {pouch film for liquor packaging}

The present invention relates to a pouch film for liquor packaging, and more particularly, to a pouch film for liquor packaging capable of storing liquor for a long period of time by blocking the discharge of alcohol components to the outside due to excellent gas barrier properties.

With the development of the industry, the demand for films using synthetic resins is rapidly increasing, and is used in many parts of daily life.

Currently, films used for packaging are widely used in general households, restaurants, and distribution packaging of various fruits, vegetables, growth, and processed foods. These films have a variety of uses, but have a function of maintaining freshness by blocking moisture permeation in addition to the function of preventing the introduction of foreign substances, which is a basic use.

Typically, liquors such as soju, wine, and whiskey are filled and distributed in packaging containers such as bottles or cans. Since the material itself is gas impermeable in such a packaging container, it is possible to fundamentally prevent the alcohol component contained in the liquor from being vaporized and discharged to the outside.

However, bottles or cans have a fixed shape and are relatively bulky, so they are difficult to distribute, store, and carry.

In order to solve this problem, in recent years, alcoholic beverages are sold in pouch-type packaging containers made of synthetic resin film materials.

Republic of Korea Utility Model Registration No. 20-0386535 discloses a pouch for packaging alcoholic beverages.

Since the pouch is made of a thin plastic film, there is a problem in that it cannot block the alcohol component from being evaporated and discharged to the outside.

Republic of Korea Utility Model No. 20-0386535: Pouch for packaging alcoholic beverages

The present invention was created to improve the above problems, and to provide a pouch film for liquor packaging capable of storing liquor for a long period of time by effectively blocking the discharge of alcohol components to the outside by enhancing gas barrier properties due to a multilayer structure. There is this.

The pouch film for liquor packaging of the present invention for achieving the above object comprises: an inner skin in contact with a liquid liquor containing alcohol; A first inner layer having a thickness of 15 to 25 μm formed of polyethylene (PE), and the first inner layer having a thickness of 15 to 25 μm, which is bonded to the upper portion of the inner skin and is formed to be thinner than the inner skin and blocks the passage of gas. A second inner layer having a thickness of 20 to 30 μm, which is bonded to the upper part of the inner layer, and a third inner layer having a thickness of 15 to 25 μm, which is bonded to the upper portion of the second inner layer, and formed of polyethylene (PE), , The outer shell is bonded to the upper portion of the third inner layer and formed of a first outer layer having a thickness of 8 to 16 μm formed of polyethylene terephthalate (PET), and a thickness of 5 to formed of a thin film of aluminum material bonded to the upper portion of the first outer layer. A second outer layer having a thickness of 10 μm and a third outer layer having a thickness of 8 to 16 μm are bonded to an upper portion of the second outer layer and formed of polyethylene terephthalate (PET).

In addition, the first outer layer is formed by adding cellulose nanofibers.

And a cover layer is further formed on the top of the outer shell, and the cover layer is an acrylic solution, calcined starfish powder, ethylene tetrafluoroethylene, (3,3,3-trifluoropropyl) trimethoxysilane, fluorine alcohol, It is formed by coating with a coating solution mixed with copper colloid.

As described above, the present invention can effectively block the discharge of alcohol components to the outside by increasing gas barrier properties due to the multilayer structure. Therefore, it has the advantage of being able to store alcoholic beverages for a long time.

1 is a cross-sectional view of a pouch film for packaging alcoholic beverages according to an embodiment of the present invention,
2 is a cross-sectional view showing an extract of the outer skin of a pouch film for packaging alcohol according to another example of the present invention.

Hereinafter, a pouch film for liquor packaging according to a preferred embodiment of the present invention will be described in detail.

1, a pouch film 1 for liquor packaging according to an example of the present invention is largely composed of an inner skin 10 and an outer skin 200. The inner skin 10 and the outer skin 20 are each formed in a multilayer structure.

The endothelium 10 is a part that comes into contact with liquid alcohol containing alcohol. The inner skin 100 may have a thickness of 50 to 80 μm. Since the inner skin 10 serves to protect the object to be packaged, the inner skin 10 is formed thicker than the outer skin 20 to have strength and durability as a packaging film.

In the illustrated example, the endothelium 10 has a three-layer structure. For example, the endothelium is composed of a first inner layer 11, a second inner layer 13 coupled to an upper portion of the first inner layer 11, and a third inner layer 15 coupled to an upper portion of the second inner layer 13 .

The second inner layer 13 is formed thicker than the first inner layer 11 and the third inner layer 15. For example, the first inner layer 11 may have a thickness of 15 to 25 μm, the second inner layer 13 may have a thickness of 20 to 30 μm, and the third inner layer 15 may have a thickness of 15 to It can be formed in 25㎛. The second inner layer 13 positioned in the middle has a great influence on the strength and elongation of the film.

Each layer of the endothelium 10 may be formed of a polyethylene (PE) resin. It is preferable to use linear low density polyethylene (LLDPE) as the polyethylene resin. Linear low-density polyethylene may be used having a density of 0.910 to 0.925 g/cm ³ . Linear low density polyethylene may be a copolymer of ethylene and α-olefin. For example, it may be a copolymer of 80 to 90% by weight of ethylene and 10 to 20% by weight of α-olefin. Here, the α-olefin is a comonomer, and may be any one or a mixture of two or more of propylene, butene, pentene, hexene, octene, nocene, decene, and the like.

Linear low-density polyethylene is preferably polymerized using a metallocene catalyst rather than a Ziegler-Natta catalyst. Polyethylene polymerized using a metallocene catalyst has a more uniform structure than polyethylene polymerized using a Ziegler-Natta catalyst, and can increase elongation and tensile strength.

It goes without saying that each layer of the inner skin 10 may include an appropriate amount of plasticizer, dispersant, stabilizer, pigment, etc., in addition to polyethylene in consideration of moldability, functionality and physical properties.

The three-layered endothelium 10 can be manufactured by coextrusion. For example, while extruding the molten resin from each of the three extruders through a T-die, three layers can be laminated to produce a three-layered inner skin.

The outer skin 20 is coupled to the upper portion of the inner skin 10, that is, outside the inner skin 10 to protect the inner skin 10 and block the passage of gas. The outer skin 20 may be bonded to the upper portion of the inner skin 10 by a binder. As the binder, conventional adhesives such as acrylic, polyurethane, and polyester can be used.

The outer skin 20 is formed to be thinner than the inner skin 10. For example, the outer shell 20 may have a thickness of 21 to 42 μm.

In the illustrated example, the shell 20 has a three-layer structure. The outer skin is bonded to the first outer layer (21) coupled to the upper portion of the third inner layer (15), the second outer layer (23) coupled to the upper portion of the first outer layer (21), and the second outer layer (23). It consists of a third outer layer (25).

The first outer layer 21 and the third outer layer 25 are formed thicker than the second outer layer 23. For example, the first outer layer 21 is formed to have a thickness of 8 to 16 μm, the second outer layer 230 is formed to have a thickness of 5 to 10 μm, and the third outer layer 21 is formed to have a thickness of 8 to 16 μm. .

The first outer layer 21 and the third outer layer 25 may be formed of polyethylene terephthalate (PET) resin. Polyethylene terephthalate may have a density of 1.33 g/cm ³ or about 1.33 g/cm ³ . The first outer layer 21 and the third outer layer 25 protect the second outer layer 23 while maintaining the strength and durability of the outer skin 20.

The second outer layer 23 is formed of a thin aluminum material. This second outer layer 23 serves to block external light, air, and moisture. In particular, it blocks the evaporation of alcohol components generated from alcohol and discharge to the outside.

The second outer layer 23 may be bonded between the first outer layer 21 and the third outer layer 25 by a binder. As the binder, conventional adhesives such as acrylic, polyurethane, and polyester can be used.

The above-described outer shell 20 has excellent gas barrier properties and effectively blocks the discharge of alcohol components to the outside, so that alcoholic beverages can be stored for a long time.

Meanwhile, in order to further improve gas barrier properties and strength, the first outer layer 21 may be formed by adding cellulose nanofibers. For example, the first outer layer 21 may be formed by mixing 95 to 98% by weight of polyethylene terephthalate and 2 to 5% by weight of cellulose nanofibers and then extrusion molding.

Cellulose nano fiber (CNF) refers to nano- or micrometer-sized rod-shaped particles or fibers in which cellulose chains are bundled together. Cellulose nanofibers may have a diameter of 5 to 100 nm and a length of 10 to 100 μm.

Although not shown, as another example of the present invention, a cover layer may be further formed on the outer skin. The thickness of the cover layer may be 4 to 10 μm.

The cover layer is formed by coating with a coating solution in which an acrylic solution, calcined starfish powder, ethylene tetrafluoroethylene, (3,3,3-trifluoropropyl) trimethoxysilane, fluorine alcohol, and copper colloid are mixed. The coating solution is 1 to 6 parts by weight of calcined starfish powder, 0.5 to 5 parts by weight of ethylenetetrafluoroethylene, 0.5 to 5 parts by weight of (3,3,3-trifluoropropyl)trimethoxysilane based on 100 parts by weight of the acrylic solution , 2 to 8 parts by weight of fluorine alcohol, and 0.1 to 2 parts by weight of copper colloid may be mixed to form a composition.

Acrylic emulsion can be used as an acrylic solution. The fired starfish powder means that the starfish is fired at a high temperature (700 to 900°C) and then pulverized to a size of micrometers or nanometers. The fired starfish powder has a porous structure in which countless pores are formed on the surface and inside. The fired starfish powder having such a porous structure improves the releasability of the film and increases gas barrier properties.

Ethylene Tetra Fluoro Ethylene is a fluorine-bonded resin. Ethylene tetrafluoroethylene has a very low surface energy by relatively lowering contact with a material such as water droplets because no hydrogen bonds are formed. For this reason, the antifouling property can be improved, and non-adhesive properties and releasability can be greatly improved. And (3,3,3-trifluoropropyl) trimethoxy silane (Trimethoxy (3,3,3-trifluoropropyl) silane) is a kind of fluorine silane, and serves to increase the bonding strength with the fired starfish powder particles. Since (3,3,3-trifluoropropyl)trimethoxysilane is a fluorine compound such as ethylenetetrafluoroethylene, fired starfish powder by addition of (3,3,3-trifluoropropyl)trimethoxysilane It binds strongly with ethylenetetrafluoroethylene between the particles.

As for fluorine alcohol, fluorine alcohol improves antifouling properties. tetrafluoro-1-propanol) can be used.

Copper colloid is a solution in which nano-copper particles are dispersed in a dispersion medium such as distilled water or alcohol. Copper colloids have an antibacterial role.

The coating solution may be coated on the surface of the outer shell by various methods such as deposition coating, immersion coating, spin coating, and application to form a cover layer.

Meanwhile, according to the present invention, as another example, the second outer layer constituting the shell may be implemented as shown in FIG. 2.

Referring to FIG. 2, a first outer layer 21, a second outer layer 23 coupled to an upper portion of the first outer layer 21, and a third outer layer 25 coupled to an upper portion of the second outer layer 23 Consists of The first outer layer 21 and the third outer layer 25 are the same as those of FIG. 1 described above.

A plurality of first slits 31 are formed at regular intervals on the upper surface of the second outer layer 23 made of an aluminum thin film, and a plurality of second slits 35 are formed at regular intervals on the lower surface of the second outer layer 23 Is formed. The first slit 31 and the second slit 35 promote deformation and restoration of the outer shell 20.

The first slit 31 and the second slit 35 are formed as grooves having a certain depth. The first slit 31 and the second slit 35 may be formed on the second outer layer 23 by pressing the aluminum thin film with a press mold.

The first slit 31 and the second slit 35 are positioned to be offset from each other. That is, the second slit 35 is formed at a position corresponding to the center of the two first slits 31. In addition, the first slit 31 is formed at a position corresponding to the center of the two second slits 35.

The first slit 31 is a first vertical portion 32 extending vertically from the upper surface of the second outer layer 23 to a predetermined depth, and the second outer layer 23 is bent at the end of the first vertical portion 32. It consists of a first inclined portion 33 extending obliquely to the upper surface.

And the second slit 41 is a second vertical portion 36 extending vertically to a predetermined depth from the lower surface of the second outer layer 23, and the second outer layer 23 is bent at the end of the second vertical portion 36 It consists of a second inclined portion 37 extending obliquely to the lower surface of the. The second inclined portion 37 is formed to be inclined in a direction opposite to the first inclined portion 33.

When the above-described outer shell 20 is bent from the outside to the inside, the first slit 31 is opened and the second slit 35 is closed. And when the outer skin is bent from the inside to the outside, the first slit 31 is constricted and the second slit 35 is opened. This morphological change makes it easy to deform the outer shell and has a resilience to return to its original state after deformation.

Hereinafter, the present invention will be described through the following examples. However, the following examples are intended to specifically illustrate the present invention, and are not intended to limit the scope of the present invention to the following examples.

(Example)

As shown in Table 1 below, a pouch film having a total thickness of 96 μm was prepared by configuring the inner and outer skins.

division Material thickness
Endothelium 1st inner layer LLDPE 20㎛ 2nd inner layer LLDPE 25㎛ 3rd inner layer LLDPE 20㎛
coat 1st outer layer PET 12㎛ 2nd outer layer Al 7㎛ 3rd outer layer PET 12㎛

(Comparative example)

The endothelium applied in the examples was used as a pouch film.

<Physical property test>

Physical properties were tested for the pouch films of Examples and Comparative Examples in the following manner.

-Tensile strength: measured according to ASTM D882 standard.

-OTR Barrier property: According to the standard measurement method of ASTM D3985, oxygen permeability (cc/m ² ·day · atm) at 0% relative humidity was measured using a permeability meter, which was added over time after 90 days. Evaluated as. The experimental results are shown in Table 2 below.

division Example Comparative example Tensile strength (gf/mm ² ) 645 236 OTR Barrier
(cc/m ² ·day·atm) 0-10 600~800 After 90 days of OTR Barrier
(cc/m ² ·day·atm) 0-10 1000 or more

Referring to the results of Table 2, the Example was found to be much better than the Comparative Example in strength and gas barrier properties. In Examples, it was confirmed that excellent gas barrier properties were maintained even after 90 days.

In the above, the present invention has been described with reference to an exemplary embodiment, but this is only exemplary, and those of ordinary skill in the art will understand that various modifications and equivalent embodiments are possible therefrom. Therefore, the true scope of protection of the present invention should be determined only by the appended claims.

1: pouch film 10: inner skin
11: 1st inner layer 13: 2nd inner layer
15: third inner layer 20: outer shell
21: first outer layer 23: second outer layer
25: third outer layer

Claims (3)

An endothelium in contact with liquid alcohol containing alcohol;
It is coupled to the upper portion of the endothelium to form a thinner thickness than the endothelium and blocks the passage of gas; and
The inner skin includes a first inner layer having a thickness of 15 to 25 μm formed of polyethylene (PE), a second inner layer having a thickness of 20 to 30 μm formed of polyethylene (PE) and bonded to an upper portion of the first inner layer, and the second inner layer It is bonded to the top of and has a third inner layer having a thickness of 15 to 25 μm formed of polyethylene (PE),
The outer shell is bonded to the upper portion of the third inner layer and is formed of a first outer layer having a thickness of 8 to 16 μm formed of polyethylene terephthalate (PET), and a thickness of 5 to 10 formed of a thin film of an aluminum material bonded to the upper portion of the first outer layer. A second outer layer of µm and a third outer layer having a thickness of 8 to 16 µm formed of polyethylene terephthalate (PET) and bonded to an upper portion of the second outer layer,
A cover layer is further formed on the top of the outer skin,
The cover layer is formed by coating with a coating solution in which an acrylic solution, fired starfish powder, ethylene tetrafluoroethylene, (3,3,3-trifluoropropyl) trimethoxysilane, fluorine alcohol, and copper colloid are mixed. Pouch film for packaging alcoholic beverages. The pouch film for liquor packaging according to claim 1, wherein the first outer layer is formed by adding cellulose nanofibers. delete

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