KR20090062739A - Packaging material having barrier property and method for preparing the same - Google Patents

Abstract

A barrier type packaging material, and its manufacturing method are provided to improve barrier property, to prevent delamination of layers, to lower the manufacturing cost and to enhance storage stability. A barrier type packaging material comprises a first film part(10) which has an outermost film(11), and a barrier layer(12) formed on the surface of the outermost film; and a second film part(20) which is formed at the lower part of the first film part which has a base film(21), and an innermost layer(23) formed at the lower part of the base film.

Description

Packaging material having barrier property and method for preparing the same

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a barrier packaging material and a method for producing the same, and more particularly, to a barrier packaging material for packaging food such as meat products such as beef jerky and dried fish, and a manufacturing method thereof.

Food packaging materials should have a low barrier to oxygen or moisture transmission through high barrier properties and thus protect their contents from outside for a long time.

Conventionally, a packaging material using an aluminum layer or an aluminum thin film technology is known, but such a technique causes environmental problems when disposed.

Moreover, there exist some which used the film which co-extruded ethylene vinyl alcohol between polyethylene resins as a part of packaging material structure.

However, according to the research results of the present inventors, the conventional packaging material including the coextruded film of ethylene vinyl alcohol is still not satisfactory barrier properties.

SUMMARY OF THE INVENTION An object of the present invention is to provide a barrier packaging material having a high product preservation and stability, which not only has a high barrier property but also has no interlayer peeling, a low manufacturing cost, and no other environmental problems. To provide.

In this invention, it consists of a 1st film part and the 2nd film part formed in the said 1st film lower part, The said 1st film part contains the outermost film and the barrier layer formed in the surface of the said outermost film, The said 2nd The film part includes a base film and an innermost layer formed below the base film, and provides a barrier packaging material and a method of manufacturing the same.

The barrier packaging material of the present invention not only has high barrier property, but also no interlayer peeling. In addition, the manufacturing cost is low, there are no other environmental problems, it has a high product preservation and stability.

Hereinafter, a barrier packaging material and a method of manufacturing the same according to an embodiment of the present invention will be described in detail.

In this invention, a packaging material is comprised by a 1st film part and a 2nd film part, and a barrier layer is formed in the outermost film surface of a 1st film.

Further, preferably, the barrier layer may be a transparent deposition layer such as a metal oxide or any one of a coating layer of polyvinyl alcohol, or a two-layer film of a transparent deposition layer and a coating layer of polyvinyl alcohol.

That is, in the present invention, the barrier film is formed by dividing the first film portion and the second film portion when forming the packaging material, and forming a barrier layer for blocking oxygen and moisture on the outermost film surface itself of the first film portion by deposition or coating. In particular, by forming a single layer of a transparent deposition layer or a coating layer of polyvinyl alcohol as the barrier layer, or by further forming two layers of a transparent deposition layer and a polyvinyl alcohol layer, the barrier property of the packaging material can be further improved. Can be.

1 is a schematic view showing a laminated configuration of a barrier packaging material according to an embodiment of the present invention.

As shown in FIG. 1, a packaging material according to an exemplary embodiment of the present invention includes a first film part 10 and a second film part 20 formed under the first film part 10.

The first film part 10 includes an outermost film 11 and a barrier layer 12 formed under the outermost film 11.

As the outermost film 11, a resin film such as polyethylene terephthalate, polyethylene naphthalate, polyolefin, polyamide, ethylene vinyl alcohol and the like can be used.

The barrier layer 12 serves to block oxygen and moisture. The barrier layer 12 is not formed as a separate barrier film, but is formed by coating or depositing on an inner surface of the outermost film 11. As a result, the barrier property can be further improved.

In addition, the barrier layer 12 includes any one layer or two or more layers of a transparent deposition layer such as a metal oxide or a coating layer of polyvinyl alcohol. It is preferable to form two layers of a transparent vapor deposition layer and polyvinyl alcohol from a barrier property. However, stacking three or more layers of the transparent deposition layer and the polyvinyl alcohol coating layer is not preferable because the cost is increased without further improving the barrier property.

The metal oxide of the transparent deposition layer is, for example, a deposition layer such as aluminum, silicon oxide or magnesium oxide. Here, physical vapor deposition (PCVD), for example, vacuum deposition, sputtering, ion plating, ion cluster beam, etc. may be used for the deposition.

The polyvinyl alcohol coating layer is formed by mixing polyvinyl alcohol with a solvent, for example, by comma coating or gravure coating.

Further, the polyvinyl alcohol is preferably used to further include nano clay, wherein the nano clay is preferably used within 10% by weight relative to the total weight of the total composition of the polyvinyl alcohol coating liquid.

When forming the coating layer of the polyvinyl alcohol, the coating amount is preferably applied so that the average 10g / m ² in the range of 5 ~ 20g / m ² .

On the lower surface of the barrier layer 12 formed as described above, desired printing may be performed to further form the printed layer 13.

The base film 21 and the innermost layer 23 under the base film 21 are formed in the second film part 20.

In constructing the base film 21, between each film (between the base film 21 of the first film part 10 and the second film part or of the base film 21 of the second film part and its lower part). It is preferable to use the three-layer laminated film which co-extruded polypropylene, polypropylene, and polyethylene, for example as said base film 21 so that interlayer peeling may not occur between innermost layers 23].

At this time, the resin layer of the base film 21 in contact with the first film portion 10 may be a copolymer polypropylene (copolymer PP) or a homo polypropylene (homo PP) in order to have a strong adhesion between the printing layer 13 and the interlayer Preference is given to using terpolymer PP. The copolymer polypropylene is polymerized into a copolymer using any one monomer of ethylene, butylene or hexene in addition to propylene, and the terpolymer polypropylene is any two monomers selected from ethylene, butylene or hexene in addition to propylene. It is polymerized by terpolymer using.

In addition, in order to maintain the adhesion between the base film 21 and the innermost layer 23, the resin layer in contact with the innermost layer 23 of the base film 21 uses polyethylene rather than polypropylene, more preferably Linear low density polyethylene is used.

The innermost layer 23 is a single layer or a laminated film of two or more layers of a polyolefin such as polyethylene or polypropylene, and particularly preferably includes a linear low density polyethylene layer.

An adhesive layer or a melt extrusion resin layer 22 may be further formed between the innermost layer 23 and the base film 21. That is, the innermost layer 23 and the base film 21 may be laminated with an adhesive, and in particular, polyethylene is used to melt-extrude the innermost layer 23 and the base film 21 from a tee die. It is preferable.

As the adhesive, it is preferable to use a two-component curable polyurethane resin, a polyisocyanate resin, and ethyl acetate. Accordingly, the adhesive may satisfy a standard of 6 mg / m ² or less, which is a standard residual solvent.

An anti-fogging agent or slip agent may be further added to the innermost layer 23 as described above.

In view of the antifogging function, the antifogging agent is preferably one or two or more alkanol amines. In particular, the antifogging agent using any one or two or more of ethanol amine, diethanol amine, triethanolamine, N-methylethanolamine, N-ethylethanolamine, N-butyl monoethanolamine or N-butylethanolamine It is preferable.

For reference, the anti-fog function means to prevent condensation by increasing the critical wetting tension of the film, such as forming a thin water film on the surface of the film, thereby preventing the decay of the contents, increasing the freshness and making the contents visible. .

It is preferable to add such an antifogging agent at 5 weight% or less with respect to the weight of the innermost layer whole resin composition so that it may not affect a film.

The first film part 10 and the second film part 20 are laminated using an adhesive.

Here, the adhesive is preferably a two-component curing type polyurethane resin, polyisocyanate resin, ethyl acetate as described above.

Hereinafter, the present invention will be described in more detail with reference to the following examples and comparative examples, but these examples and comparative examples are for illustrative purposes only and should not be construed as limiting the protection scope of the present invention. In particular, the following comparative examples are merely classified under the name comparative example for the purpose of contrasting with a specific group set in the following examples.

[First Experiment-Experiments on Barrier Properties and Interlayer Adhesive Strength]

Example  One

As shown in FIG. 1, the outermost film 11 is a polyethylene terephthalate film in the first film part 10, and a polyvinyl alcohol is coated on the lower part of the outermost film to form a coating layer 12. And the printing layer 13 was formed in the lower part. In the second film portion 20, a stretched polypropylene film was used as the base film 21, polyethylene was used as the adhesive layer 22, and a linear low density polyethylene film was formed on the innermost layer 23.

Example  2

Example 2 is the same as that of Example 1 except the base film 21. In the base film 21, Example 2 used the three-layer coextrusion film of a polypropylene layer, a polypropylene layer, and a polyethylene layer instead of the single | mono layer of a stretched polypropylene film.

Example  3

Example 3 has the same configuration as Example 1 except for the outermost film 11 lower layer 12. In the lower layer 12 of the outermost film 11, Example 3 is made of polyvinyl alcohol. A deposition layer of silicon oxide (thickness: 300 Pa) was formed instead of the coating layer.

Comparative example  One

In the film according to the first comparative example, the outermost film was used as a polyethylene terephthalate film, and a printing layer was directly formed on the lower part of the outermost film. A polypropylene film coated with polyvinyl alcohol was formed at the bottom of the printed layer. Polyethylene was used as an adhesive layer at the bottom of the polypropylene film, and a linear low density polyethylene film was formed at the innermost layer.

Comparative example  2

In the film according to the second comparative example, the outermost film was a polyethylene terephthalate film, and a coating layer of polyvinylidene chloride was formed on the lower part of the outermost film, and a printing layer was formed on the lower part of the outermost film. A co-extruded three-layer film of polyethylene, ethylene vinyl alcohol and polyethylene was formed in the lower portion thereof, and a linear low density polyethylene film was formed as the innermost layer in the lower portion thereof.

<Experiment>

Barrier

In order to measure the gas barrier property, a sample film was placed in an oxygen permeability measuring machine (OXTRAN 2-20 manufactured by MOCON) and oxygen permeability was measured under measurement conditions (temperature: 25 ° C., humidity: RH 50% ± 20%). If, based on the oxygen 100%, oxygen transmission rate less than 5cc / ㎡ / 24 hours (hereinafter expressed as "X") good, and ( "○" as represented by), if it exceeds 5cc / m ^2/24 of time and is not satisfactory .

In order to measure the moisture permeability, the sample film was put in the moisture permeability measuring machine (PERMATRAN-W3 / 31 by MOCON), and the moisture permeability was measured under measurement conditions (temperature: 37.8 ° C, humidity: RH 100%). Good moisture permeability of 3 gm / m 2/24 hours or less (marked with "○"), medium to 3 gm / m 2/24 hours or less of 5 gm / m 2/24 hours (marked with "△"), 5 gm / m 2 Poor if greater than / 24 hours (indicated by "X").

Interlayer Bonding Strength

The end of the packaging material of the 15mm wide sample was separated by layering and fixed to both sides in a tensile strength machine (AGI-100D of SHIMADZU, Japan), and the interlayer adhesion strength was measured.

As the tape attached to the packaging material is peeled off, the adhesive strength of 400gf / 15mm or more between layers is required as the adhesive strength between layers so as not to tear the packaging material itself.

Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Oxygen permeability (cc / m ² / day)  ○ (1.81) ○ (2.02) ○ (1.58) X (35) X (5.68) Breathability (gm / m ² / day) ○ (2.0) ○ (2.8) ○ (0.18) ○ (1.9) △ (4.47) Interlayer Adhesive Strength (gf / 15mm) 350-400 400-450 350-400 100-150 330-350

As can be seen from Table 1, Examples 1 to 3 showed high barrier properties in both oxygen permeability and moisture permeability. In Example 3, a transparent deposition layer (a silicon oxide layer) was used instead of a polyvinyl alcohol layer. In this case, not only the oxygen permeation was reduced but also the degree of moisture permeability was greatly reduced.

On the other hand, Comparative Example 1, in which the coating layer of polyvinyl alcohol was not formed on the lower surface of the outermost film, unlike Example, had very high oxygen permeability.

In Comparative Example 2, a coating layer of polyvinylidene chloride was formed on the outer surface of the outermost film, but both oxygen permeability and moisture permeability were higher than those of the embodiments in which the coating layer or the transparent deposition layer of polyvinyl alcohol was formed.

The films of the examples were superior to the comparative examples also in the interlayer adhesion strength. Among the comparative examples, Comparative Example 1 in which the barrier layer (polyvinyl alcohol coating layer) was formed on the lower portion of the base film instead of the outermost film was particularly poor in interlayer adhesion strength. On the other hand, while the barrier layer was formed under the outermost film, and in particular, Example 2 using the three-layer coextrusion film of the polypropylene layer, the polypropylene layer, and the polyethylene layer as the base film was more excellent in the interlayer adhesion strength.

[2nd experiment-anti-fogging experiment]

Previously, the high temperature of the Example 1 film in the first experiment was added to the innermost layer of the antifogging agent (ethanol amine) (Example 1 of the present experiment) and not added (Comparative Example 1 of the present experiment), respectively. Antifogging and low temperature antifogging were measured.

Specifically, the high temperature anti-fogging property was placed in a cup of 100 ℃ water, and then covered with a cup of each film, the water vapor condensation phenomenon was visually confirmed.

In addition, the low-temperature antifogging property was put into a cup of room temperature water, and then covered with each film and stored in the refrigerator and refrigerated after 1 minute and 1 hour, it was visually confirmed.

Example 1 Comparative Example 1 High temperature antifogging No vapor condensation Water vapor partially weak Low temperature antifogging (after 1 minute) No vapor condensation Water vapor partially badly Low temperature antifogging (after 1 hour) No vapor condensation Severe vapor condensation

1 is a schematic view showing a laminated configuration of a barrier packaging material according to an embodiment of the present invention.

* Description of Major Reference Marks *

10: first film portion 11: outermost film

12 barrier layer 13 printed layer

20: second film portion 21: base film

22: adhesive layer or melt-extruded resin layer 23: innermost layer

Claims (25)

As a packaging material, The packaging film is composed of a first film portion and a second film portion formed below the first film portion, The first film portion includes an outermost film and a barrier layer formed on the outermost film surface, The second film portion is a barrier packaging material, characterized in that it comprises a base film and the innermost layer formed under the base film. The method of claim 1, The barrier layer is a barrier packaging material, characterized in that the coating layer of polyvinyl alcohol. The method of claim 1, The barrier layer is a barrier packaging material, characterized in that the transparent deposition layer. The method of claim 1, The barrier layer is a barrier packaging material, characterized in that consisting of two layers of a coating layer of polyvinyl alcohol and a transparent deposition layer. The method according to claim 2 or 4, The coating layer of the polyvinyl alcohol barrier packaging material, characterized in that it further comprises nanoclay. The method according to claim 3 or 4, The transparent deposition layer is a barrier packaging material, characterized in that the deposition layer of a metal oxide. The method of claim 6, The metal oxide is a barrier packaging material, characterized in that any one or two or more of aluminum oxide, silicon oxide or magnesium oxide. The method of claim 1, The first film portion is a barrier packaging material, characterized in that further comprising a printing layer under the barrier layer. The method of claim 1, The said innermost layer consists of a single layer or two or more layers of a polyolefin resin layer, The barrier packaging material characterized by the above-mentioned. The method of claim 9, The innermost layer is a barrier packaging material, characterized in that it comprises a linear low density polyethylene layer. The method of claim 1, Barrier packaging material, characterized in that the anti-fogging agent or slip agent is added to the innermost layer. The method of claim 11, The antifogging agent is any one or a mixture of two or more of ethanol amine, diethanol amine, triethanol amine, N-methyl ethanol amine, N-ethylamine, N-butyl monoethanolamine or N-butyl diethanolamine Barrier Packaging. The method of claim 1, The base film is a barrier packaging material, characterized in that it comprises a polyolefin resin layer. The method of claim 1, The base film is a barrier packaging material, characterized in that the three-layer film of polypropylene resin, polypropylene resin and polyethylene resin layer. The method of claim 14, The barrier film packaging material of the said base film in which the 1st film part and the polypropylene resin layer contact | connect, and the polypropylene resin layer which contact | connects a 1st film part consists of copolymer polypropylene or terpolymer polypropylene. The method of claim 14, The innermost layer and the polyethylene resin layer in contact with the base film, the polyethylene resin layer in contact with the innermost layer is a barrier packaging material, characterized in that made of polyethylene-based resin. The method of claim 16, The polyethylene resin is a barrier packaging material, characterized in that the linear low density polyethylene. As a manufacturing method of a packaging material, Forming a first film portion for depositing or coating a barrier layer on a lower surface of the outermost film; Forming a second film portion to form an innermost layer under the base film; And And a packing material forming step of laminating the second film part on the lower part of the first film part. The method of claim 18, In the first film portion forming step, a method for producing a barrier packaging material, characterized in that to deposit a metal oxide on the lower surface of the outermost film. The method of claim 19, And depositing a metal oxide on the lower surface of the outermost film and then coating polyvinyl alcohol on the deposited metal oxide. The method of claim 18, In the first film portion forming step, the manufacturing method of the barrier packaging material, characterized in that the polyvinyl alcohol is coated on the lower surface of the outermost film. The method of claim 21, Method of manufacturing a barrier packaging material, characterized in that by depositing a metal oxide on the coated polyvinyl alcohol after coating the polyvinyl alcohol on the lower surface of the outermost film. The method of claim 18, In the first film portion forming step, the method of manufacturing a barrier packaging material, characterized in that further forming a printing layer below the barrier layer. The method of claim 18, In the second film portion forming step, the innermost layer is laminated with the base film using a polyethylene resin adhesive, characterized in that the manufacturing method of the barrier packaging material. The method of claim 18, In the second film portion forming step, the method of producing a barrier packaging material, characterized in that the innermost layer and the base film by melt extrusion using a polyethylene-based resin.

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