KR20210085854A - Gas-barrier Sheet Having Function of Preventing Browning, Container Using the Same and Manufacturing Method thereof - Google Patents

Abstract

The present invention relates to a gas barrier sheet with an anti-browning function that can prevent oxygen from penetrating into the interior, effectively preventing browning of meat, and retaining a shape in a lightweight structure during the distribution period; a container using the same; and a method for manufacturing the same. The gas barrier sheet according to the present invention comprises: a base layer disposed at the bottommost part; a gas barrier layer having excellent gas barrier properties; first and second protective layers for protecting the gas barrier layer in a sandwich structure from upper and lower portions; a surface layer disposed on the uppermost layer and in contact with a meat product; a first adhesive layer for adhering the surface layer and the first protective layer; and a second adhesive layer for bonding the base layer and the second protective layer.

Description

Gas-barrier Sheet Having Function of Preventing Browning, Container Using the Same and Manufacturing Method thereof

The present invention relates to a container, and more particularly, to a gas barrier sheet having a function of preventing browning of meat, a container using the same, and a manufacturing method thereof.

Packaging (packaging) is one of the most important processes for end use or for maintaining the quality of food during storage and transportation. The four basic functions of packaging are protection function, sealing function, information function and convenience function. The quality of most food products deteriorates due to mass transfer phenomena such as moisture absorption, oxygen penetration, flavor loss, odor absorption, and migration of packaging material components into the food. These phenomena can occur between food and its surrounding materials, between food and its packaging, or between heterogeneous ingredients in food.

Oxygen is one of the major factors in food damage. Several side effects caused by oxygen penetration into food and beverages include rancid odor of unsaturated fats, loss of vitamin C, browning of fresh meat, oxidation of aromatic flavor oils and pigments, and accelerated growth of aerobic putrefactive microorganisms. These undesirable effects on product quality indicate that the removal or exclusion of oxygen is one of the main goals for food and beverage preservation.

For over 20 years, active atmosphere gas conversion packaging (active MAP), including _{N 2} , O ₂ , and CO _{2 gas flushing, has been used for food preservation.} The varied compositional ratio of these gases provides an extension of shelf life. Decreasing the O ₂ level and raising the CO ₂ level to a certain concentration can delay the ripening of fresh fruits and vegetables.

Although the use of plastics as packaging materials has increased rapidly, plastics used for various purposes have not replaced glass and metal. Plastic polymer packaging systems based solely on passive diffusion cannot always provide adequate barrier properties for gases such as oxygen. Oxygen must be excluded from some foods and beverages in order to maintain freshness and not change the taste and texture.

Some foods and beverages undergo oxidative or other aerobic degradation processes that are harmful even to oxygen present at very low ppm levels. There is considerable interest in the partial use of reactive polymer membranes for oxygen scavenging systems. Currently, beer is packaged in plastic containers such as poly(ethylene terephthalate) (PET) as a plastic container packaging material. As a method, if a packaging material containing an oxygen-removing material is applied to a gas barrier polymer with a simple passive function, the oxygen permeability can be significantly reduced. With the application of oxygen-removing polymer packaging materials, the shelf life of oxygen-sensitive food and beverage products can be increased to a degree corresponding to that of glass and metal packaging materials.

Meanwhile, the use of LDPE, a polyolefin-based general-purpose material, in the flexible packaging market has increased significantly in recent decades due to its low cost, chemical inertness, excellent mechanical properties and light weight.

Korean Patent Publication No. 10-1911284 (Patent Document 1) discloses a resin composition for an oxygen adsorption packaging film containing polyethylene-based resin, polyisoprene, polybutadiene, cobalt chloride and benzophenone, and an oxygen adsorption film for packaging manufactured using the same Disclosed is a technology used for packaging foodstuffs, electronic products or pharmaceuticals.

The oxygen adsorption film for packaging of Patent Document 1 not only blocks oxygen diffusion and inflow from the external environment, but also greatly reduces the amount of oxygen present inside the container, thereby maintaining the physical properties of the packaging object sensitive to oxygen concentration and greatly increasing the storage period. A packaging composition is disclosed.

The oxygen adsorption film for packaging manufactured according to Patent Document 1 is for packaging products that require freshness maintenance, such as processed meat food or vegetables. Since it can be used for sealing and packing by pressing, it is used for vacuum packaging, but there is a problem that the oxygen adsorption film cannot be used to manufacture a container.

Therefore, when manufacturing a container for accommodating processed meat food, etc., it is easy to manufacture at a low cost during mass production, and it has the strength to maintain its shape in a lightweight structure while suppressing browning during transport and storage of packaged products. A multilayer film and a container with which it is not proposed.

When oxygen penetrates into the vacuum packaging film during the distribution period, it decomposes and generates gas, and browning of livestock products, especially meat, occurs.

The vacuum packaging film of Korean Patent No. 10-1036754 (Patent Document 2) is from the bottom layer of ethylene vinyl alcohol copolymer, nylon, adhesive resin, and ethylene-vinyl acetate copolymer resin (Ethylene-Vinyl). It consists of a multi-layered film stacked in the order of Acetate Copolymer, so it cannot prevent browning of meat due to its low gas barrier properties (gas barrier performance) that can effectively prevent oxygen from penetrating into the inside during the distribution period.

The vacuum packaging film of Patent Document 2 also has a problem in that it cannot be manufactured into a container having strength that can maintain its shape in a lightweight structure while blocking the occurrence of browning of livestock products, particularly meat.

: Korean Patent Publication No. 10-1911284 : Korean Patent Publication No. 10-1036754

Accordingly, the present invention has been proposed to solve the problems of the prior art, and its purpose is to prevent oxygen from penetrating into the interior, thereby effectively preventing the browning of meat and maintaining the shape in a lightweight structure during the distribution period. An object of the present invention is to provide a gas barrier sheet having an anti-browning function having high strength, a container using the same, and a method for manufacturing the same.

Another object of the present invention is to protect the gas barrier layer that is weak against moisture and is strong against contamination on the base layer that can maintain the basic strength of the container, and is a gas barrier layer weak against moisture as a pair of protective layers with excellent tensile strength, durability and gas barrier properties An object of the present invention is to provide a gas barrier sheet having an anti-browning function, a container using the same, and a manufacturing method thereof, by laminating a gas barrier multilayer film that protects the layer in a sandwich structure at the upper and lower portions.

In order to achieve the above object, a gas barrier sheet according to an aspect of the present invention includes a base layer disposed at the lowermost portion; a gas barrier layer having excellent gas barrier properties; first and second protective layers protecting the gas barrier layer in a sandwich structure from upper and lower portions; a surface layer disposed on the uppermost layer and in contact with the meat product; a first adhesive layer for adhering the surface layer and the first protective layer; and a second adhesive layer for adhering the base layer and the second protective layer.

In addition, the container having an anti-browning function according to the present invention is characterized in that it is obtained by hot forming the gas barrier sheet.

A method of manufacturing a container having an anti-browning function according to the present invention includes: manufacturing a gas barrier sheet by laminating a base layer disposed at the bottom and a gas barrier multilayer film; forming a container on the gas barrier sheet by hot forming; and cutting and separating the container from the gas barrier sheet on which the container is formed.

As described above, the gas barrier sheet and the container using the same according to the present invention can prevent oxygen from penetrating into the interior, thereby effectively preventing the browning of meat and maintaining the strength to maintain the shape in a lightweight structure during the distribution period. have

In addition, in the present invention, a gas barrier layer weak to moisture is formed as a pair of protective layers that are strong against contamination and have excellent tensile strength, durability and gas barrier properties on the base layer that can maintain the basic strength of the container while protecting the gas barrier layer that is weak against moisture. By laminating a gas barrier multilayer film that protects the upper and lower parts with a sandwich structure, it has anti-browning, light weight and durability.

1A and 1B are a plan view and a perspective view of a container having an anti-browning function, respectively, according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along line XX of FIG. 1A .
3 is an enlarged view of part A of FIG. 2 .
4 is a schematic process diagram showing a manufacturing process of a container having a browning prevention function according to an embodiment of the present invention.
5 is a process diagram illustrating a process of laminating a base layer and a gas barrier multilayer film.
6 is a cross-sectional view illustrating a use state of a container having a browning prevention function according to an embodiment of the present invention.

Hereinafter, preferred embodiments according to the present invention will be described with reference to the accompanying drawings.

In this process, the size or shape of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, terms specifically defined in consideration of the configuration and operation of the present invention may vary depending on the intention or custom of the user or operator. Definitions of these terms should be made based on the content throughout this specification.

The container of the present invention is a pair of protective layers that are strong against contamination and have excellent tensile strength, durability, and gas barrier properties. By protecting the gas barrier layer, which is weak against moisture, in a sandwich structure from the top and bottom, long-term preservation of processed meat products is possible, resulting in browning of meat can be effectively prevented, so it can be used for vacuum packaging of meat products.

1A and 1B are respectively a plan view and a perspective view showing a container having an anti-browning function according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line XX of FIG. 1A, and FIG. 3 is an enlarged portion A of FIG. It is also

As shown in FIGS. 1A to 3 , the container 100 having an anti-browning function according to an embodiment of the present invention has an open space 15 capable of accommodating the meat product 20 therein. made up of shapes. To this end, the container 100 extends from the bottom surface 11 in a state in which the opposite two side walls 12 in the longitudinal direction are opened at a predetermined angle, and the opposite second side walls 16 in the width direction are also opened at a predetermined angle. state is extended.

In addition, the container 100 has a flange portion 14 extending through the bent portion 13 having a flat surface at the upper end. The flat bent portion 13 is, for example, as shown in FIG. 6 , when the meat product 20 is accommodated and packaged in the receiving space 15 inside the container 100 , the vacuum skin film 30 is formed. It serves as a sealing part that is sealed after being covered.

The container 100 according to the present invention has a protrusion line at a distance from the four side walls 12 and 16 so that a concave line 17 is formed at the boundary between the bottom surface 11 and the fourth side walls 12 and 16 as needed. 18) can be formed. In this case, even when the liquid extract flows out of the processed meat product 20 accommodated in the receiving space 15 inside the container 100, it collects in the concave line 17 and comes into contact with the meat product 20. can be kept to a minimum.

The container 100 is manufactured using a gas barrier sheet 10 having a gas barrier layer 6 having excellent gas barrier properties (gas blocking performance) so as to have a browning prevention function.

The gas barrier sheet 10 is a gas barrier multilayer film 99 on the base layer 9 that can maintain the basic strength of the container while protecting the gas barrier layer 6 weak to moisture, as shown in FIG. 5 . It is obtained by laminating using a pair of rollers 91 and 92, and is wound on a roll shaft in the form of a roll to form the winding body 10a. In this case, the lamination between the base layer 9 and the gas barrier multilayer film 99 may be performed by thermocompression bonding using an adhesive. The adhesive forms the second adhesive layer (8).

The base layer 9 may be formed of, for example, a polypropylene (PP) sheet having a thickness of about 500 μm to maintain the basic strength of the container while blocking moisture.

The gas barrier multilayer film 99 is, for example, made of a thickness of about 30 μm, a gas barrier layer 6 excellent in gas barrier properties (gas blocking performance), and the gas barrier layer 6 is formed in upper and lower portions first and second protective layers 5 and 7 to protect in a sandwich structure, a three-layered surface layer 1-3 and the surface layer 1-3 disposed on the surface side to make contact with the processed meat product 1 It includes a first adhesive layer (4) for adhering the protective layer (5).

First, for the gas barrier layer 6, for example, EVOH having excellent gas-barrier properties, chemical resistance, surface glossiness, and very high rigidity may be used. EVOH is a thermoplastic resin obtained by copolymerizing (copolymerization) of ethylene and vinyl alcohol under high pressure, and is also called EVOH resin.

Because EVOH (ethylene vinyl alcohol) resin is thermoplastic, extrusion molding is possible. In addition, EVOH resins are often used for other thermoforming applications such as engineering plastics and fibers, or for materials that improve the properties of other resins. In addition, it is widely used as a building material such as wallpaper or pipes for ondol.

EVOH resin is used in the container 100 of the present invention to block external oxygen from being sucked into the container by using high gas barrier properties, and has the best oxygen barrier properties among existing chemical resins. .

The first and second protective layers 5 and 7 block the passage of moisture while protecting the gas barrier layer 6 in a sandwich structure from the top and bottom in consideration of, for example, that the EVOH resin is weak to moisture and has a weak tensile force. A polyamide (PA) film that is strong against contamination and has excellent tensile strength, durability and gas barrier properties can be used.

Nylon, an alias of polyamide (PA), is a generic term for synthetic polymer polyamides, connected by amide bonds (-CONH-), and is a chain-shaped polymer. As the strongest fiber among synthetic fibers, many types of products can be made using this nylon fiber. Nylon is thin and light, tough, stain-resistant, and durable, so it is widely used as a material for mountaineering clothing and various mountaineering equipment.

Polyamide (PA) improves the performance of the tensile strength in the container of the present invention, improves the durability of the container, and has good gas barrier properties, so it is suitable for food storage. It serves to protect the EVOH resin layer.

Moreover, the three-layered surface layer 1-3 may use a polyethylene (PE) film, and it is located on the uppermost part of the gas barrier multilayer film 99 of the present invention and softens the gas barrier multilayer film 99 of the container. It plays a role in making the molding work well.

The container 100 according to the present invention may be manufactured using an automatic molding machine and a press using the gas barrier sheet 10 having a 9-layer structure.

The gas barrier sheet 10 may be composed of a single layer instead of the surface layer 1-3 having a three-layer structure. In the case of using a multilayer film laminated in a 9-layer structure as the only characteristic of the molding machine, two layers of PE film may be added as a dummy layer.

Hereinafter, a method of manufacturing a container according to the present invention will be described with reference to FIG. 4 .

First, a gas barrier multilayer film 99 having a seven-layer structure is prepared by laminating (S11). The gas barrier multilayer film 99 according to the present invention has a second protective layer 7, a gas barrier layer 6, a first protective layer 5, a first adhesive layer 4, and a surface layer (1-) from the inner layer to the uppermost layer. It is composed of a 7-layer structure film laminated in the order of 3).

In this case, the first adhesive layer 4 is formed by injecting an adhesive between the surface layer 3 and the first protective layer 5 . The first adhesive layer 4 forms an adhesive layer by putting an adhesive resin in it to prevent interlayer peeling of the film, and any adhesive resin for a film that is harmless to the human body can be used.

Thereafter, the polypropylene (PP) sheet used as the base layer 9 and the gas barrier multilayer film 99 are laminated by thermocompression bonding using an adhesive to prepare the gas barrier sheet 10 ( S12 ).

Next, the gas barrier sheet 10 is put into the molding machine (S13), the laminated sheet is heated, and a printing operation required for the container is performed (S14).

After that, the gas barrier sheet 10 on which the printing operation has been made is transferred to the mold part of the molding machine by a certain length, and the upper mold is lowered in a state in which the sheet is brought into contact with the lower mold in a vacuum method to form a container in a hot manner ( S15).

When the hot forming is completed, it is cooled, the upper mold is raised, and the gas barrier sheet 10 on which the container molded article is molded is taken out from the lower mold (S16).

Thereafter, the gas barrier sheet 10 in which the container is formed on the sheet is advanced by a predetermined length, and the container formed by the press is cut and separated by punching (S17).

Accordingly, the gas barrier sheet 10 is continuously manufactured while advancing through the entire process by a predetermined length.

As shown in FIG. 6, the container 100 manufactured as described above accommodates the meat product 20 in the accommodating space 15, and then includes a bent part ( 13) and can be used for vacuum packaging.

In the above, the present invention has been illustrated and described with examples of specific preferred embodiments, but the present invention is not limited to the above-described embodiments, and within the scope of not departing from the spirit of the present invention, common knowledge in the technical field to which the present invention belongs Various changes and modifications will be possible by those who have

The present invention is a pair of protective layers that are strong against contamination and have excellent tensile strength, durability, and gas barrier properties. By protecting the gas barrier layer, which is weak against moisture, in a sandwich structure from the top and bottom, it is possible to prevent oxygen from penetrating into the meat during the distribution period. It can be applied to the manufacture of containers that can effectively prevent the browning of

1-3: surface layer 4,8: adhesive layer
5,7: protective layer 6: gas barrier layer
9: base layer 10: gas barrier sheet
10a: winding body 11: bottom surface
12,16: side wall 13: bent part
14: flange portion 15: space
17: groove line 18: protrusion line
20: meat products 30: vacuum skin film
91,92: roller 99: gas barrier multilayer film
100: courage

Claims (3)

a base layer disposed at the bottom;
a gas barrier layer having excellent gas barrier properties;
first and second protective layers protecting the gas barrier layer in a sandwich structure from upper and lower portions;
a surface layer disposed on the uppermost layer and in contact with the meat product;
a first adhesive layer for adhering the surface layer and the first protective layer; and
A gas barrier sheet comprising a; a second adhesive layer for bonding the base layer and the second protective layer. A container having an anti-browning function obtained by hot forming the gas barrier sheet according to claim 1 . Preparing a gas barrier sheet by laminating the base layer and the gas barrier multilayer film disposed at the bottom;
forming a container on the gas barrier sheet by hot forming; and
A method of manufacturing a container comprising a; cutting and separating the container from the gas barrier sheet on which the container is formed.

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