KR20170104797A

KR20170104797A - Package film

Info

Publication number: KR20170104797A
Application number: KR1020160027658A
Authority: KR
Inventors: 김영한; 김영재; 이영노
Original assignee: 대륭포장산업 주식회사
Priority date: 2016-03-08
Filing date: 2016-03-08
Publication date: 2017-09-18

Abstract

Provided is a packaging film with oxygen impermeability and gas release functions. To this end, the packaging film with oxygen impermeability and gas release functions comprises: a multilayered film (10) in which an aluminium foil layer (14) and an outer skin layer (12) are sequentially laminated on a base layer (16); a permeation groove (16G) having a recessed groove-like shape provided on the multilayered film (10); and a barrier membrane (16R) having a thin film form provided on the inside of the permeation groove (16G). The permeation groove (16G) penetrates the aluminium foil layer (14) from the outer skin layer (12), and is extended in a form of a recessed groove with specific depth from an outer surface of the base layer (16) on the multilayered film (10) toward an inner surface. The remaining thick portions of the base layer (16) form the barrier membrane (16R).

Description

Film for packaging having oxygen permeation prevention function and gas discharge function {Package film}

The present invention relates to a packaging film having an oxygen permeation preventing function and a gas discharging function. More particularly, the present invention relates to a novel oxygen permeation film which prevents external oxygen from entering the inside of a wrapping paper, And a gas discharge function.

In general, food wrapping papers such as Kimchi, Kochujang, and Doenjang are made of single-layer polyethylene, polypropylene, and PET / AL / LLDPE, NY / AL / LLDPE, NY / LLDPE and the like are used. In addition to LLDPE, they may be used as CPP. In the case of food wrapping paper made of an envelope by film, a wrapping paper is formed by sealing an opening portion by heat fusion or the like.

In recent years, households that purchase cooked foods from marts are increasing, rather than eating them at home. As a result, companies are introducing various foods that have been cooked in packaging have. Of course, kimchi is also included in the foods that are cooked and sold by the companies.

On the other hand, pouch-type packaging materials made of plastic films are widely used as packaging materials for packaging foods. Fermented foods such as kimchi, kochujang, soybean paste, and fermented foods are continuously fermented and aged during the distribution process. The pressure inside the wrapping paper is increased to expand the wrapping paper, resulting in breakage and leakage of the contents. In addition, the fermentation gas generated from the packaged fermented food often causes a problem of deterioration or deterioration of freshness.

As an alternative to solve the problems associated with such fermented food packaging, a method of enclosing a gas adsorbent (gas absorbent) together with a food so as to absorb or adsorb gas in a wrapping paper has been proposed. When the package is sealed together, the gas adsorbent adhered on the food is visually immediately exposed when the package is opened, which damages the taste of the consumer, and there is a possibility that the gas adsorbent is severely damaged and leaked to the food, The process is complicated and inefficient.

Accordingly, in order to solve the above-mentioned problems, a wrapping paper which can form a through hole for discharging the fermentation gas in the wrapping paper, and a film for discharging the fermentation gas is provided separately for covering the through hole, have.

Recently, various attempts have been made to improve the barrier properties of polymer films. However, on the contrary, the demand for the production of a film excellent in gas permeability is also increasing.

There have been various processes for manufacturing some films requiring a film excellent in gas permeability and a method of making a small hole or thinly using a film having good gas permeability has been used.

However, if a hole is made in the film, the contents can not prevent the outflow of the liquid, and the contents of the liquid as well as the gas are leaked out. The process of producing a thin film having excellent gas permeability is disadvantageous in that the film is blown or torn when the impact is received due to the mechanical strength deterioration.

Korean Registered Patent No. 10-0291468 (registered on March 12, 2001) Korean Registered Utility Model No. 20-0299006 (registered on Dec. 10, 2002)

SUMMARY OF THE INVENTION The present invention has been developed in order to solve the above-mentioned problems, and it is an object of the present invention to provide a food packaging method and a food packaging method which can prevent outside oxygen from entering the inside of a wrapping paper, Which is capable of preventing the formation of molds and the like, and also to provide a packaging film having a novel oxygen permeation prevention function and a gas discharge function.

According to an aspect of the present invention, there is provided a multilayer film comprising: an aluminum foil layer and an outer layer sequentially laminated on a base layer; A permeable groove formed in the multilayer film in a concave groove shape; And a barrier film formed as an inner thin film of the permeable groove. The film for packaging includes the oxygen permeation prevention function and the gas evacuation function.

The packaging sheet is formed by the multilayer film, and the gas permeability of the packaging sheet is changed in accordance with the thickness of the barrier film.

In the present invention, the gas generated inside the wrapping paper is smoothly discharged to the outside of the package through the permeation groove through the barrier membrane inside the permeation groove, while the barrier film prevents the oxygen from penetrating into the inside of the wrapping paper When the food inside the wrapping paper is broken due to the external oxygen, for example, there is an effect of preventing occurrence of mold or the like.

FIG. 1 is a photograph showing an enlarged view of a state where a laser is set to 3 pulses on a LLDPE single-layer film to form a transmission groove
FIG. 2 is a photograph showing an enlarged view of a state in which a transmission groove is formed by introducing a laser into a LLDPE single layer film with four pulses
FIG. 3 is a photograph showing an enlarged view of a state in which a transmission groove is formed by introducing a laser into a LLDPE single layer film in five pulses
4 is a graph showing the oxygen permeability of the 50 占 퐉 -thick LLDPE single-layer film itself
5 is a graph showing oxygen permeability in the state where two permeation grooves are formed in a 50 占 퐉 thick LLDPE single-layer film
6 is a graph showing oxygen permeability in a state where three permeation grooves are formed in a 50 占 퐉 thick LLDPE single-layer film
7 is a graph showing oxygen permeability in a state where four permeation grooves are formed in a 50 占 퐉 thick LLDPE single-layer film
8 is a graph showing the oxygen permeability in the state where five permeation grooves are formed in a 50 占 퐉 thick LLDPE single-layer film
9 is a perspective view showing a part of a state in which a permeation groove is formed in a film for wrapping with oxygen permeation prevention and gas discharge function according to the present invention
FIG. 10 is a cross-sectional view of a wrapping paper produced using a wrapping film having an oxygen permeation preventing function and a gas discharging function according to the present invention, and showing an enlarged view of a state in which a permeation groove and a barrier film are formed in a multilayer film
11 is a partially enlarged photograph of a film for packaging with oxygen permeation prevention and gas discharging function according to the present invention. FIG. 11 is a photograph showing an enlarged view of a state of forming a transmission groove and a barrier film by setting three pulses of laser in a multilayer film.
12 is a partially enlarged photograph of a film for packaging with oxygen permeation prevention and gas discharging function according to the present invention. FIG. 12 is a photograph showing an enlarged view of a state of forming a permeation groove and a barrier film by setting four pulses of laser in a multilayer film.
FIG. 13 is a photograph showing a film for packaging with oxygen permeation prevention and gas discharging function according to the present invention in an enlarged scale. FIG. 13 is a photograph showing an enlarged view of a state of forming a permeation groove and a barrier film by setting 5 pulses of laser on a multilayer film.
FIG. 14 is a partially enlarged photograph of a film for packaging with oxygen permeation prevention and gas discharge function according to the present invention. FIG. 14 is a photograph showing an enlarged view of a state in which a laser is set to 6 pulses on a multilayer film,
FIG. 15 is a photograph showing a film for a wrapping paper having an oxygen permeation prevention function and a gas discharge function according to the present invention in enlarged view, showing a state in which a laser is set to 7 pulses in a multilayer film and a permeation groove and a barrier film are formed
16 is a partially enlarged photograph of a film for packaging with oxygen permeation prevention and gas discharging function according to the present invention. FIG. 16 is a photograph showing an enlarged view of a state in which a laser is set to 8 pulses on a multilayer film,
17 is a photograph showing a partially enlarged photograph of a film for packaging with oxygen permeation prevention and gas discharging function according to the present invention. FIG. 17 is a photograph showing an enlarged view of a state in which a laser is set to 9 pulses in a multilayer film,
FIG. 18 is a photograph showing a partially enlarged photograph of a film for packaging with oxygen permeation prevention and gas discharge function according to the present invention. FIG. 18 is a photograph showing an enlarged view of a state in which a laser is set to 10 pulses in a multilayer film,
19 is a graph showing the oxygen permeability in a state where one permeation groove and a barrier film are formed in the multilayered film
20 is a graph showing oxygen permeability in a state where two permeation grooves and a barrier film are formed in a multilayered film
21 is a graph showing oxygen permeability in a state where three permeation grooves and a barrier film are formed in a multilayered film
22 is a graph showing oxygen permeability in a state where four permeation grooves and a barrier film are formed in a multilayered film
23 is a graph showing oxygen permeability in a state where five permeation grooves and a barrier film are formed in the multilayered film
24 is a graph showing oxygen permeability in a state where six transmission grooves and a barrier film are formed in the multilayered film
25 is a graph showing oxygen permeability in a state where seven transmission grooves and a barrier film are formed in a multilayered film
26 is a graph showing oxygen permeability in a state where eight transmission grooves and a barrier film are formed in a multilayered film
27 is a graph showing oxygen permeability in a state where nine permeation grooves and a barrier film are formed in a multilayered film
28 is a graph showing oxygen permeability in a state where ten transmission grooves and a barrier film are formed in a multilayered film

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The objects, features and advantages of the present invention will be more readily understood by reference to the accompanying drawings and the following detailed description. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. For example, if a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected or connected to the other component, It is to be understood that other components may be "connected "," coupled "

Referring to the drawings, a film for packaging with oxygen permeation prevention and gas discharge function according to the present invention comprises a multilayer film 10 in which an aluminum foil layer 14 and an outer covering layer 12 are sequentially laminated on a base layer 16 The permeation groove 16G and the barrier film 16R are provided so that the gas generated inside the wrapping paper can be transmitted to the outside of the wrapping paper while preventing the external oxygen from being transmitted into the wrapping paper. In an embodiment of the present invention, the base layer 16 of the multilayer film 10 may be made of an LLDPE sheet, an aluminum foil layer 14 is laminated on the base layer 16, 12 are stacked, and the outer covering layer 12 may be made of PET or Nylon sheet. In one embodiment of the present invention, the multilayer film 10 may be a composite material. In other words, in one embodiment of the present invention, the multilayered film 10 is a multilayered film 10, which is a composite film of PE, AL, PE, PET or Nylon based on an inner LLDPE.

A permeation groove 16G is formed in the multilayer film 10 in a concave groove shape. At this time, the transmission grooves 16G are formed by irradiating the multilayer film 10 with a laser. The permeation grooves 16G are formed to pass through the outer layer 12 and the aluminum foil layer 14 and the permeation grooves 16G may end up on the outer surface of the base layer 16, It may lead to a concave groove to a certain depth from the outer surface of the base layer 16 toward the inner surface.

The barrier film 16R is formed as an inner thin film of the transmission groove 16G. If the permeation groove 16G is formed so as to penetrate only from the outer skin layer 12 to the aluminum foil layer 14, the base layer 16 forms the barrier film 16R, and the permeation groove 16G forms the multilayer film 10 The remaining thickness portion (film portion) of the base layer 16 forms the barrier film 16R. The thickness of the barrier layer 16R is the thickness of the base layer 16,

The wrapping paper of the present invention having the above-described structure can be made into a wrapping paper by using a conventional wrapping paper producing apparatus. The wrapping paper is packed with a fermented food such as kimchi. The packaging paper produced by the packaging film of the present invention has a structure including the permeation groove 16G and the barrier film 16R. At this time, in the present invention, the permeation groove 16G refers to a structure in which a gas (generated mainly by fermentation of fermented food such as kimchi) generated inside a wrapping paper containing food (mainly fermented food such as kimchi) And the barrier film 16R is a thin film which prevents external oxygen from permeating (penetrating) into the wrapping paper. The permeable groove 16G and the barrier film 16R are formed so as to penetrate at least the aluminum foil layer 14 so that the permeation groove 16G and the barrier film 16R are formed so as to penetrate at least the aluminum foil layer 14, To have the release function of the main effect.

The permeation groove 16G and the barrier film 16R are provided at a predetermined interval along one side end portion of the multilayer film 10 along the other side end portion. In this case, the gas permeability inside the wrapping paper can be further increased, which is more preferable. More preferably, the permeation groove 16G and the barrier film 16R are formed in a lattice pattern on both sides of the wrapping paper. Then, the gas permeability inside the wrapping paper can be further increased, which is more preferable.

As a comparative example in which the transmission groove 16G and the barrier film 16R are formed in the multilayered film of the present invention, the correlation between the number of pulses and the oxygen permeability during laser processing of various films is shown in Table 1. [

&Lt; Correlation of number of pulses and oxygen permeability in processing single layer film according to kind of polymer resin >

1 to 3 are photographs of the single-layer film after perforation (i.e., after perforation of the permeation groove 16G). SEM measurement data per pulse.

Table 2 below shows the result of gas permeability analysis of each resin according to the number of holes (number of penetration grooves (16G)) per laser processing group.

It can be confirmed that two, four, six, and eight holes (the transmission grooves 16G) of the film according to the respective resin types are processed to increase the gas permeability analysis result, but it is not increased by a multiple of one hole gas permeability The result came out.

On the other hand, Figs. 4 to 8 are the results of simulating the oxygen permeability according to the number of the permeation grooves 16G and the barrier film 16R of the single-layer film. And the oxygen permeability was simulated using an oxygen permeability analyzer. In the figure, OTR means oxygen permeability. As the number of the permeation grooves 16G and the barrier layer 16R increases, the oxygen permeability increases.

Unlike the above comparative example, in the present invention, a packaging paper is formed by the multilayer film 10, and the gas permeability of the packaging paper is changed in accordance with the thickness of the barrier film 16R.

The multilayer film (10), which is the most commonly used packaging material, was fabricated and the gas permeability according to the laser pulse was analyzed.

The multilayered film 10 is composed of a composite layer (A multilayer film) of PET 12 μm / PE 20 μm / AL 7 μm / PE 20 μm / LLDPE 70 μm, and Nylon 12 μm / PE 20 μm / AL 7 μm / PE 20 Mu m / LLDPE 70 mu m (B multilayer film) was used.

&Lt; Gas permeability according to pulse for each multilayer film (10) >

11 to 18 show pulse SEM photographs of the multilayer film 10 (composite material). And is a photograph showing an enlarged view of the transmission groove 16G (hole) and the barrier film 16R by a microscope.

Multilayer film 1 pulse 2 pulses 3 pulses 4 pulses 5 pulses A multilayer film 1.37 4.50 42 143 620 B multilayer film 1.41 4.79 49.5 156 776 Multilayer film 6 pulses 7 pulses 8 pulses 9 pulses 10 pulses A multilayer film 1056 1209 1726 2741 4241 B multilayer film 893 1418 1811 2747 4676 The unit of the value according to the number of holes is cc

&Lt; Analysis of gas permeability according to hole group of pulsed laser processing >

19 to 29 show results of gas permeability analysis according to the hole group of the pulsed laser processing of the multilayer film 10 (composite material). Multilayer Film (10) (Composite Material) This is the result of summarizing the transmittance per pulse. In the present invention, analysis of oxygen permeability according to the hole group of pulsed laser processing through an oxygen permeability analyzer is shown. This is a result of summarizing the transmittance of the multilayer film (composite material) per pulse. OTR means oxygen permeability. It can be seen that the oxygen permeability is lowered by the gas permeation groove and the barrier film of the present invention. On the other hand, the equipment of the applicant of the present invention in the laboratory is an oxygen permeability analyzer of illinos, and there are CELL (A) and CELL (B) capable of measuring two samples in such equipment. In the figure, CELL (A) and CELL (B) have FLO-B and FLO-T, FLO-B is BOTTOM, and FLO-T is TOP. That is, the sample is squeezed to measure the OTR value, the bottom space is the BOTTOM, and the upper space of the sample is the TOP. Here, this space was again squeezed to make a vacuum state, where the amount of oxygen permeated through the gas cylinder was measured. For reference, the oxygen permeability analyzer of illinos was also used in the test of the single layer film. OTR means the gas permeability. As the number of the permeation grooves 16G and the barrier film 16R increases, the gas permeability increases.

Therefore, in the case of the film for wrapping according to the present invention, the gas generated inside the wrapping paper is smoothly discharged to the outside of the wrapping paper through the permeation groove 16G through the barrier film 16R inside the permeation groove 16G , The barrier film 16R prevents external oxygen from penetrating into the inside of the wrapping paper, thereby preventing occurrence of, for example, mold when the food inside the wrapping paper is broken due to external oxygen . It is possible to maintain the fresh state of the food (especially the fermented food such as kimchi) contained in the wrapping paper without being damaged by the gas generated inside the wrapping paper or oxygen outside. Particularly, in the present invention, the multilayered film 10 is provided with a permeation groove 16G penetrating to the aluminum foil layer 14 to reliably maintain the freshness of food inside the wrapping paper by the aluminum foil layer 14, 16G and the barrier film 16R exhibit a combination of the gas discharging function and the external oxygen permeation preventing function in the inside of the wrapping paper as described above.

In the case of the single layer film, the gas permeability is higher than that of the present invention, but the outer oxygen permeability is too high as compared with the present invention, so that the food is excessively washed due to external oxygen penetration into the wrapping paper, There is a problem that it can not be taken or the kimchi is too hot to eat.

On the other hand, in the present invention, the gas permeability in the wrapping paper is lower than that of the single-layer film, but the gas inside the wrapping paper can sufficiently escape so that the wrapping paper is too full of gas to prevent the wrapping paper from being excessively blown or popped Oxygen permeability of the outside is significantly lower than that of the existing one, so that the oxygen penetrates into the inside of the wrapping paper and the food becomes too washable, or the kimchi becomes too hot so that the food can not be consumed or the kimchi becomes too hot It is different from the existing one in that it can prevent problems from occurring in advance.

The barrier film 16R is formed to have a thickness of about half of the total thickness of the base layer 16 so that the gas inside the package can be surely discharged to the outside of the package through the barrier film 16R, The blocking function is assured. The depth of the permeation groove 16G is formed so as to extend from the shell layer 12 to half the depth of the thickness of the base layer 16 (one-half of the thickness of the thickness) to ensure the gas discharge function and oxygen penetration prevention function . The depth of the permeation groove 16G is in a range of one-half to one-half of the thickness between the upper and lower surfaces of the base layer 16, and when less than one-half, the oxygen barrier function is deteriorated, If the ratio exceeds 2/1, it is necessary to adjust the depth of the permeation groove 16G to the above range since the function of discharging gas from the inside of the package to the outside is lowered and the desired gas discharge effect can not be obtained.

Meanwhile, in the present invention, it is also possible to attach an auxiliary sticker which can be attached and detached separately on the multilayer film 10, and the transmission groove 16G may be formed in the multilayer film 10 by passing the auxiliary sticker through the laser. In this case, the strength of the permeation groove 16G is reinforced by the auxiliary sticker to more reliably prevent occurrence of a phenomenon that the barrier film 16R formed by the permeation groove 16G is broken by an external pulling force or the like can do. The portion of the barrier film 16R is relatively weaker than the other portion due to the permeation groove 16G. Since the auxiliary sealer reinforces the strength around the barrier film 16R, It is possible to more reliably prevent occurrence of a phenomenon of breakage caused by the breakage. On the other hand, since the hole communicated with the permeation groove 16G is formed in the auxiliary sticker, it can be prevented that the external oxygen permeation prevention and the gas discharge function inside the wrapping paper are affected.

The specific embodiments of the present invention have been described above. It is to be understood, however, that the scope and spirit of the present invention is not limited to these specific embodiments, and that various modifications and changes may be made without departing from the spirit of the present invention. If you have, you will understand.

Therefore, it should be understood that the above-described embodiments are provided so that those skilled in the art can fully understand the scope of the present invention. Therefore, it should be understood that the embodiments are to be considered in all respects as illustrative and not restrictive, The invention is only defined by the scope of the claims.

10. Multi-layer film 12. Shell layer
14. Aluminum foil layer 16. Base layer
16G. Permeable groove 16R. Barrier film

Claims

A multilayer film (10) in which an aluminum foil layer (14) and an outer covering layer (12) are sequentially laminated on a base layer (16);
A permeation groove 16G provided in the multilayer film 10 in a concave groove shape;
And a barrier film (16R) formed as an inner thin film of the permeation groove (16G). The film for packaging with oxygen permeation prevention and gas discharge function.

The method according to claim 1,
The permeable groove 16G is formed to penetrate the aluminum foil layer 14 in the shell layer 12 and the base layer 16 is configured to form the barrier film 16R. Film for packaging with gas discharge function.

3. The method of claim 2,
The permeable groove 16G is configured to extend from the outer surface of the base layer 16 of the multilayer film 10 to a groove having a predetermined depth in the direction of the inner surface and the remaining thickness portion of the base layer 16, (16R). &Lt; RTI ID = 0.0 > 16. < / RTI >

The method of claim 3,
Wherein the permeation groove (16G) and the barrier film (16R) are provided at a predetermined interval along one side end portion of the multilayer film (10) along the other side end portion. Film for packaging.

The method according to claim 1,
Wherein a packaging paper is formed by the multilayer film (10), and the gas permeability of the packaging paper is changed in accordance with the thickness of the barrier film (16R).