KR100404708B1 - Aseptic Food Packing Material - Google Patents

Abstract

Sterile food packaging material of the present invention is produced by heating and thermoforming a multi-layer sheet (Sheet) laminated, composed of a plurality of thermoplastic synthetic resins having different physical properties as shown in Figure 1 packaging container 20 to receive the contents of food And the upper container lid film 1 for sealing the contact surface with the spore container.

The packaging container includes a surface layer composed of the container inner surface layers 21 and 22 forming the inner surface of the container and the container outer surface layers 26 and 27 forming the outer surface, and an oxygen barrier layer for preventing the penetration of oxygen into the container after extrusion molding. (24) and adhesive layers 23 and 25 for adhering the surface layer and the oxygen barrier layer. On the other hand, the lid film 10 of the packaging container is opened after thermal bonding with the printing layer 12 capable of printing, the oxygen barrier layer 14 to block oxygen transmission from the outside after heat bonding with the printing layer and the packaging container. It consists of this easily bonding layer 16.

The container inner surface layer of the packaging container of the present invention is composed of an outer container inner surface layer 21 and an inner container inner surface layer 22, and the container outer surface layer is again an outer container outer surface layer 27 and an inner container outer surface layer 26. It consists of.

The sterile food packaging material of the present invention not only has the heat resistance, water barrier property, and impact resistance properties that are inevitably required in the sterile food manufacturing process, but also has an oxygen barrier layer that can block oxygen, so that even when the food is stored at room temperature for a long time, It is possible to prevent food spoilage or deterioration due to air inflow.

Description

Aseptic Food Packing Material

The present invention relates to a sterile food packaging material, and more particularly to a sterile food packaging material comprising a packaging container having physical properties and food hygiene required in the aseptic food manufacturing process and a container lid that is easy to open and has undergone a special sterilization process. will be.

The sterile food packaging material of the present invention is to provide a method for producing a sterile food packaging material having heat resistance during high temperature treatment during the sterilization process of food containers in a sterile food manufacturing plant.

For long-term preservation of food at room temperature, sterilization process is inevitably included in the food manufacturing process, so it is heat-resistant and fungus such as yeast and mold, E. coli, Salmonella, Listeria, Lactobacillus (Lactobacillus), Bacillus, Streptococose Efforts have been made to develop packaging materials that can block the possibility of spoilage or deterioration of foods caused by bacterial bacteria such as Protozoa, Clostridium, Pseudomonas and Staphylococcus.

Sterilization in the food manufacturing process is a generalization of boiling sterilization that sterilizes by wrapping food contents in hot water below 100 ℃ for a certain time and sterilization by applying heat and constant pressure of 120 ℃. There is a conventional sterilization method and a sterile packaging method for producing food using sterile packaging materials in a sterile sterile chamber.

In general, a packaging material that can be applied to boiling water and retort sterilization is a known generalized technology and does not have technical difficulties in applying it in a food process.

As a packaging material used in conventional sterile packaging, three basic materials such as metal, glass, and synthetic resin have been used. The double metal container is expensive and has a disadvantage in that only certain container forms are possible because of limitations in the molding method.

Glass bottles also have the disadvantage that they are easily broken and heavy, so synthetic resins are used to compensate for these disadvantages. Generalized synthetic resin packaging materials include proper heat resistance, moisture and oxygen barrier properties, heat adhesiveness, and food hygiene, which are required in aseptic food packaging processes. Did not satisfy.

Meanwhile, many studies and papers have been published for the development of packaging containers that can safely store food. Korean Patent Publication No. 1998-49251 discloses an antimicrobial polyvinyl chloride (PVC) wrap film for food packaging. This wrap film is made of PVC wrap material and mixed with inorganic antimicrobial material made of silver, zinc, copper, etc. which can be ion exchanged to inorganic carriers of zeolite. It provides a PVC wrap film that prevents contamination and decay and further strengthens freshness through deodorization and organic gas adsorption.

Korean Patent Laid-Open Publication No. 1999-78895 describes a method for producing a polystyrene film for food spores to which an antibacterial agent is added. The patent is to add and mix the antimicrobial master batch powder having antimicrobial to the polystyrene powder to form a polystyrene film, thereby inhibiting the growth of bacteria in contact with the polystyrene film to suppress the bacteria caused by bacteria, fungi, and other viruses The present invention relates to a polystyrene film.

However, the patents do not have the properties of heat resistance, water barrier and impact that are inevitably required in the aseptic food manufacturing process, and do not have an oxygen barrier layer that can block oxygen, so that air from outside can be stored for a long time at room temperature. There was a problem that can not prevent corruption or deterioration of foods due to inflow.

Accordingly, the present inventors have been able to solve the above problems by using a packaging material that is properly arranged, laminated and sterilized various synthetic resins as a result of a long study.

An object of the present invention is to provide a sterile food packaging material consisting of a packaging container and a packaging lid capable of withstanding high temperatures applied in the sterilization process of the food packaging container applied during the sterile food packaging process.

It is another object of the present invention to provide a sterile packaging container which can prevent the decay of food and the growth of bacteria by preventing direct contact with foods that may be harmful to the human body in the material composition of the sterile packaging container.

Another object of the present invention is to maintain the function in the γ-ray irradiation for packaging film sterilization, the lid film of the sterile packaging container laminated to prevent the decay of food and the growth of bacteria by laminating an oxygen barrier layer like a container To provide.

1 is a cross-sectional view of the sterile food packaging material of the present invention.

Figure 2 is an enlarged cross-sectional view of the main line AA 'of the present invention.

Figure 3 is an enlarged cross-sectional view of the main line B-B 'of the present invention.

<Description of Symbols for Main Parts of Drawings>

1: food packaging container 10: spore container lid film

20: packaging container 12: printed layer

14: oxygen barrier layer 16: adhesive layer

21: inner container inner surface layer 22: inner container inner surface layer

23: adhesive layer 24: oxygen barrier layer

26: inner container outer surface layer 27: outer container outer surface layer

Sterile food packaging material of the present invention is produced by heating and thermoforming a multi-layer sheet (Sheet) laminated, composed of a plurality of thermoplastic synthetic resins having different physical properties as shown in Figure 1 packaging container 20 to receive the contents of food And the upper container lid film 1 for sealing the contact surface with the spore container.

The packaging container includes a surface layer composed of a container inner surface layer (21, 22) forming an inner surface of the container and a container outer surface layer (26, 27) forming an outer surface thereof, and an oxygen barrier layer (200) for preventing the penetration of oxygen into the container after molding ( 24) and adhesive layers 23 and 25 for adhering the surface layer and the oxygen barrier layer. On the other hand, the lid film 10 of the packaging container is a printing layer 12 capable of printing, the oxygen barrier layer 14 to block the oxygen transmission from the outside after the thermal bonding with the printing layer and the opening after the thermal bonding with the packaging container. It consists of an easily bonding layer 16.

The container inner surface layer of the packaging container of the present invention is composed of an outer container inner surface layer 21 and an inner container inner surface layer 22, and the container outer surface layer is again an outer container outer surface layer 27 and an inner container outer surface layer 26. It consists of.

Since the shape or shape of the sterile food packaging container of the present invention is not defined separately, it may be manufactured in a square, rectangular, polygonal form or cup or tray form according to the demand of the consumer.

As the material of the inner surface layer and the outer surface layer of the container, polyolefin-based resins such as high density polyethylene (HDPE), low density polyethylene (LDPE), polyethylene, and polypropylene, which impart strength of the container and have water barrier properties, may be used. Melt index is 0.5 ~ 5.0g / 10min, heat deformation temperature is over 100 ℃, moisture barrier property is less than 10g / 30㎛.m².atm.24hr and less than 10kg.cm to improve heat resistance, water barrier and impact resistance. It is preferable to use polypropylene having an IZOD impact strength value of at least / cm. This is because it must withstand the high temperature of sterile packaging and must use a material that can prevent the moisture from the outside of the container to enable long-term storage of food.

The container inner surface layers 21 and 22 should not contain any components other than the polyolefin resin used as the surface layer material for food hygiene. Synthetic resin additives, such as antioxidants, plasticizers, UV stabilizers, antistatic agents, pigments such as MASTER BATCH, which are added as needed, are preferably added to the outer surface layer of the container. The content of the additive to be added is preferably used less than 20% by weight based on the total weight of the packaging container. This is to prevent the additive from eluting into the packaging container to contaminate the food contents or to the outside when a high temperature heat is applied, such as sterilizing the container at a high temperature of 140 ℃.

In addition, the oxygen barrier agent permeated from the outside of the container may be a polyolefin or a derivative thereof, an ethylene vinyl alcohol (EVOH) copolymer, and the like, and the oxygen permeability of these oxygen barrier agents is less than 5.0 cc / 20 μm.m 2 .atm.24hr. It is preferable to use because it increases the long-term storage capacity of the food.

In the structure of the sterile food packaging container of the present invention, the combination of the container surface layer and the oxygen barrier layer is not an important technical component. As shown in FIG. 3, a sterile packaging container preferably has a thickness of 100 to 1,000 mu m, an oxygen barrier layer of 10 to 200 mu m, and an adhesive layer of 5 to 100 mu m. . This is to prevent the unevenness of the thickness distribution of the container and the roughness of the container surface due to the heat applied in the extrusion of the food container.

The lid film 10 of the sterile packaging container of the present invention is an oxygen barrier layer 14 to block oxygen transmission from the outside after thermal bonding of the printing layer 12 and the container capable of printing as shown in Figure 2, It is composed of an adhesive layer 16 that can be easily opened after thermal bonding with the container, and the adhesion between the layers is by adhering the film of each layer by dry lamination method or extrusion coating by melting point of each resin ( It can be processed by Extrusion Coating method.

It is preferable to use polyethylene terephthalate (PET) and nylon (NY) as the said print layer 12, or to mix and laminate these films, and it is preferable that the thickness of a printed layer shall be 10-30 micrometers. In order to reinforce the interlayer adhesion strength in the printed layer, primer coating may be applied to the inner surface of the film and the printed surface.

The oxygen barrier layer 14 is selected from the group consisting of ethylene vinyl alcohol (EVOH) having an oxygen permeability of 5.0 cc / 20 μm. Atm. 24 hr or less, polyvinylidene chloride (PVDC), aluminum vapor-deposited PET, aluminum foil, and the like. It can be selected and used as described above, and can be biaxially stretched or unstretched depending on the manufacturing process of the film.

In addition, it is preferable to use a polyolefin-based synthetic resin for the adhesive layer 16. Preferably, the thermal bonding temperature is 150 to 220 ° C., the thermal bonding pressure is 2 to 7 kg / cm 2, and the thermal bonding time is 0.5 to 2.0. Preference is given to polypropylenes having a container adhesive strength of 0.8 to 2.0 kg / 15 mm at the beginning.

The sterile packaging container lid film 10 according to the present invention should not have bacteria in the film itself. For this purpose, after manufacturing the film food packaging container, it must be sealed with aluminum and then remain in the packaging container by irradiating γ-ray. Remove any germs that may be present. At this time, the irradiation amount of γ-ray is 5 ~ 30kGy and not only does not change the physical properties in the film by γ-ray but also should not be cured or discolored.

Example 1 Molding of a Packaging Container

In the coextrusion method, a sheet having the following thickness and material was extruded to form a container having a width × length × height (154 mm × 135 mm × 25 mm).

A: B: C: D: E: F: G = 150: 190: 15: 40: 15: 190: 150 (μm)

A: outer container inner surface layer

Material: Polypropylene

Melt Index: 0.5 g / 10min

Heat Deflection Temperature: 110 ℃

Moisture permeability 2 g / 30㎛.㎡.atm.24hr

IZOD impact strength: 60 kg.cm/cm

B: inner container inner surface layer

Material: Polypropylene

Melt Index: 0.5 g / 10min

Heat Deflection Temperature: 110 ℃

Moisture permeability: 2g / 30㎛.㎡.atm.24hr

IZO D Impact Strength: 60 kg.cm/cm

C, E: adhesive layer

Material: Polypropylene

D: oxygen barrier layer

Material: Ethylene Vinyl Alcohol (EVOH)

Oxygen permeability 0.5 cc / 20㎛.㎡.atm.24hr

F: inner container outer surface layer

Material: Polypropylene

Melt Index: 0.5 g / 10min

Heat Deflection Temperature: 110 ℃

Moisture permeability: 2g / 30㎛.㎡.atm.24hr

IZOD impact strength: 60 kg.cm/cm

G: Outer container outer surface layer: polypropylene and master batch

Material: Polypropylene (90% by weight)

Melt Index: 0.5 g / 10min

Heat Deflection Temperature: 110 ℃

Moisture permeability: 2 g / 30㎛.㎡.atm.24hr

IZOD impact strength: 60 kg.cm/cm

Antimicrobial and Masterbatch White (10% by weight)

Example 2 Molding of the Packaging Film Lid Film

After drying the lid film as described in the dry lamination (DRY LAMINATION) method, 15kGy γ-ray was irradiated to sterilize all remaining bacteria.

A: B: C = 25: 15: 40 (μm)

A: Printed layer (Nylon film is used and the inner surface is primer coated)

-8 degree print processing

B: oxygen barrier layer

Material: Ethylene vinyl alcohol (EVOH) with oxygen permeability of 0.2 cc / 20㎛.m2.atm.24hr is used.

C: adhesive layer

Material: CPP (Casted Polypropylene)

Example 3 Food Stability Test

Using a packaging container and a lid film molded in Examples 1 and 2 put a small amount of rice and water in a food packaging container in a sterile chamber, and then heated for 8 seconds at a temperature of 140 ℃ continuously for 8 seconds at 100 ℃ for 30 minutes After heating, it was thermally bonded for 1 second at a temperature of 185 ° C. and a pressure of 5 Kg / ㎠ to obtain an adhesive strength of 1.2Kg / 15㎜. After 6 months of storage at room temperature, no food corruption occurred.

The sterile food packaging material of the present invention not only has the heat resistance, water barrier property, and impact resistance properties that are inevitably required in the sterile food manufacturing process, but also has an oxygen barrier layer that can block oxygen, so that even when the food is stored at room temperature for a long time, It is possible to prevent food spoilage or deterioration due to air inflow.

Claims (10)

Aseptic food packaging container for storing food, A surface layer composed of the container inner surface layers 21 and 22 forming the inner surface of the packaging container and the container outer surface layers 26 and 27 forming the outer surface, an oxygen barrier layer 24 for preventing the penetration of oxygen into the container after extrusion molding, And packaging container 20 consisting of an adhesive layer (23, 25) for adhering the surface layer and the oxygen barrier layer; It consists of a lid film (10) consisting of a print layer (12), an oxygen barrier layer (14) that blocks oxygen transmission from the outside after thermal adhesion with the print layer, and an adhesive layer (16) that is easy to open after thermal adhesion with a packaging container. Sterile food packaging material characterized in that. The aseptic food packaging material according to claim 1, wherein the container surface layer is polypropylene and the oxygen barrier layer is ethylene vinyl alcohol (EVOH). The aseptic food packaging material according to claim 2, wherein the polypropylene has a heat deformation temperature of 100 ° C or higher. The sterile food packaging material according to claim 2, wherein the ethylene vinyl alcohol has an oxygen permeability of 5.0 cc / 20 µm.m2.atm.24hr or less. A sterile food packaging material according to claim 1, wherein a master batch of resin additive is used only for the outer surface layers (26, 27) of the container. The sterile food packaging material according to claim 1, wherein the lid film (10) is sterile sterilized so as not to change the physical properties even in γ-ray sterilization and not to be hardened or discolored. The sterile food packaging material according to claim 1, wherein the printed layer (12) is selected from nylon (NY) or polyethylene terephthalate. Sterile food packaging material according to claim 1, characterized in that the oxygen barrier layer (14) is selected from ethylene vinyl alcohol (EVOH) or polyvinylidene chloride (PVDC). 2. The sterile food packaging material according to claim 1, wherein the adhesive layer (16) maintains an adhesive strength of 0.8 to 2.0 kg / 15 mm after thermal bonding with the container as a polyolefin series. Sterile food packaging material according to claim 1, characterized in that the oxygen barrier layer (14) is selected from aluminum vapor-deposited polyethylene terephthalate (PET) or aluminum foil.