JPH07257634A - Food packing material and package for high pressure treatment - Google Patents

Abstract

PURPOSE:To prevent interlayer peeling from occuring between paper and films when a wrapping material with plastic films adhered on both surfaces of the paper is used to sterilize food with pressure applied by high pressure treatment. CONSTITUTION:In a food wrapping material 1 for high pressure treatment with plastic films 3, 4 adhered to both surfaces of paper 2 which is a shape retaining core, a film 5 having numerous air holes 5A is interposed between the paper 2 and at least one of the surface and rear plastic films 3, 4 for overlapping.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a food packaging material for high pressure treatment and a packaging container.

[0002]

2. Description of the Related Art Conventionally, a heating method has been the main method for sterilizing foods. However, since this heating method involves loss of value peculiar to food, that is, loss of vitamins and flavors or change in color tone, a pressure method by high pressure treatment has been proposed in place of heat sterilization treatment, and it has already been proposed. Used for sterilization.

A method generally used in such a pressure treatment is to fill a flexible packaging material (for example, a polyethylene bag) with a target food, heat-seal it, and seal it. It is immersed in water, which is a medium, and pressure-treated. A flexible packaging material and a container for which a plastic film is adhered to both the front and back sides of the paper that serves as the shape-retaining core material, and the paper portion is not exposed on the inner surface that contacts liquid (food). With the structure, liquid foods can be processed, and if the container of the same structure is sealed in a polyethylene bag and pressure-treated, the processing efficiency can be improved. It is a place proposed by a person (see Japanese Patent Application No. 4-300044).

[0004]

However, when high-pressure processing of food is performed using a packaging material in which a plastic film is adhered to both front and back surfaces of the above-mentioned paper and a packaging container made of this packaging material, the paper is treated with pressure. The existing voids (voids that are unavoidably formed between the entanglement of the fibers of the paper) are crushed, and then the air originally present in the voids expands in unspecified areas when the pressure is reduced. Local swelling due to swelling is observed in the surface layer of the plastic film after treatment, which may cause expansive tearing of the paper or local peeling between the paper and plastic film layers, which not only impairs the packaging function. In addition, it was found to be unfavorable because the commercial value of the appearance was damaged.

Therefore, an object of the present invention is to provide a food packaging material for high pressure treatment and a packaging container which are free from expansion tearing of paper or local peeling between the paper and the plastic film.

[0006]

DISCLOSURE OF THE INVENTION The present invention provides a food packaging material 1 for high pressure treatment in which plastic films 3 and 4 are adhered to both front and back surfaces of a paper 2 which is a shape-retaining core material. The following technical measures are taken to achieve it. That is, the food packaging material 1 according to claim 1 is superposed on at least one of the paper 2 and the front and back plastic films 3 and 4 with the film body 5 having a large number of air retention holes 5A interposed therebetween. It is characterized by being present.

The food packaging material 1 according to claim 2 is characterized in that the film body 5 having the air reservoir holes 5A is made of a plastic film. A food packaging material 1 according to a third aspect is characterized in that a large number of minute holes 2A are dispersed and perforated in a paper 2 which is a shape-retaining core material. The food packaging container 8 according to claim 4 is formed into a container 8 having a shape having an internal space 7 capable of filling and sealing food by using the packaging material 1 according to claim 1, 2 or 3. It is a feature.

[0008]

When the packaging container 8 in which the interior space 7 is filled with food and hermetically sealed by the packaging material 1 according to the present invention is subjected to high pressure, the air-containing void originally present in the paper 2 is crushed by pressure. Then, when the pressure is reduced, the film body 5 preferentially disperses and collects in the air reservoir holes 5A, and local expansion and tear of the paper 2 or the paper 2 and the plastic film 3 or 4
Avoid local delamination with.

[0009]

EXAMPLES Examples of the present invention will be described below with reference to the drawings. In FIGS. 1 (A) and 1 (B) showing a first example of a packaging material 1 according to the present invention, a shape-retaining material is used. Paper as core material 2
Has a void containing air originally in the entangled portion of the fibers, and plastic films 3 and 4 made of polyethylene, polypropylene or the like are adhered over the entire surface to both sides of the paper 2 for flexibility. It has a plate-like body.

Both the front and back surfaces of the plastic films 3 and 4 are smooth, and a large number of air retention holes 5 are provided between the films 3 and 4, and in the embodiment, between the film 3 and the paper 2.
The film body 5 having A is interposed and stacked. Film body 5
Can be composed of a film or sheet of polyethylene, polypropylene or the like, or can be composed of aluminum foil, and is inserted at both interfaces of the paper 2 and the films 3 and 4, and at least one interface of the paper 2 and the films 3 and 4. And the air when the paper 2 is crushed by pressure is preferentially applied to the film body 5
Are dispersed and gathered in the air collecting holes 5A to prevent local expansion and tear of the paper 2 or local peeling of the paper 2 and the plastic film 3.

The air reservoir holes 5A of the film body 5 are regularly formed at a constant pitch as shown in the drawing, and the shape thereof is arbitrary, but it is desirable to make it into a circle, a sill circle, or the like. Figure 2
FIG. 4 shows the second embodiment of the present invention, in which a large number of minute holes 2A are dispersedly perforated in the paper 2, and at this time, as shown in FIG. The holes 2A may be formed facing each other, or a plurality of micro holes 2A may be formed facing each other as shown in FIG.
It is not necessary to make A and 2A face each other.

The second embodiment is common to the above-described first embodiment except for the configuration in which a large number of minute holes 2A are perforated in the paper 2, and therefore common parts are designated by common reference numerals.
In the second embodiment, when the paper 2 is crushed (compressed), the air existing in the fiber entangled portion of the paper 2 preferentially passes through the minute holes 2A to the air reservoir holes 5A of the film body 5. Can be dispersed and gathered in.

FIG. 5 shows a third embodiment of the present invention.
An aluminum film 6 is interposed between a film body 5 having a large number of air retention holes 5A and a film 3. At this time, the film body 5 is preferably a plastic film or sheet. By interposing 6 in the container, the function of the container can be improved. In addition, in this 3rd Example, except having interposing the aluminum film 6, it can be made into the same structure as the 1st and 2nd Example mentioned above, and the common part is shown with the common code.

FIGS. 6 and 7 show liquid foods or puddings such as fruit juice and milk using the packaging materials 1 of the first to third embodiments described above.
A container 8 having an internal space 7 capable of filling and sealing a viscous food such as yogurt is shown. That is,
7, which is an enlarged cross-sectional view taken along the line aa of FIG. 6, has a rectangular cross-section formed by using the packaging material 1 described above, and the plastic films 3 and 4 adhered to both front and back surfaces of the paper 2 are indicated by X portions. It is heat-bonded to retain its shape and is sealed, and a plastic tape 9 for sealing is provided inside to heat-bond the film 3 to prevent food from entering the paper 2.

Further, the end portion in the direction vertical to the paper surface of FIG. 7 is sealed by heat-sealing the plastic film 3 on the inner surface and the tape 9 and folded to form a container 8 having the shape shown in FIG. This container 8 is independently immersed in a liquid which is a pressure medium for high pressure treatment, or the containers 8 are stacked in multiple stages as shown in FIG. 8 and further sealed in a polyethylene bag to be immersed in the liquid. Then, it is sterilized or sterilized by high-pressure treatment.

Referring to FIG. 9, there is illustrated a high pressure processing technique for foods which can improve the processing efficiency. In FIG.
Reference numeral 10 denotes a cylindrical high-pressure container, the opening of which is closed by a lid 11 to form a high-pressure chamber 12. The lid 11 is an upper lid 13 that is detachably attached to close the upper opening of the high-pressure container 10,
It comprises a lower outer lid 14 and a lower inner lid 15 that close the lower opening, and the axial force acting on the lid 11 is supported by a swivel-type and dolly-type press frame (not shown).

Inside the high-pressure chamber 12, cylindrical flexible partition walls 17 and 18 are provided inside and outside so that lateral pressure can be applied by feeding the pressure medium from the passage 16. With the above structure, A high-pressure processing apparatus capable of so-called dry CIP (dry cold isostatic pressing) is formed. The liquid food to be subjected to pressure treatment using the high-pressure treatment device is filled and sealed in the treatment container 8 made of the packaging material 1 described above without any gap.

Reference numeral 19 denotes a flexible holder, which is a cylindrical body portion 2.
0 and a lid 2 which is fitted in the upper and lower openings so as to be freely inserted and removed.
The holder 19 has an outer shape of the plurality of aggregates as an inner space shape 19A and has an outer shape 19B that fits inside the flexible partition wall 18. In the internal space shape, the aggregate of the processing containers 8 is housed without a gap, and the holder 19 is placed inside the partition wall 18 to perform the desired lateral pressure application.

In this case, in the flexible holder 19, at least the body portion 20 is arranged in advance inside the flexible partition wall 18 in the high-pressure chamber 12, and the assembly of the processing vessels 8 is housed therein. Alternatively, the container 8 or the like may be stored outside the high pressure chamber 12 and then brought into the high pressure chamber 12. In addition, the flexible holder 1
9 may be a body portion 20 divided into a plurality in the axial direction. Further, it is also possible to omit the 8 with only the flexible partition wall 17.

At room temperature, 400 MPa, 30 min
When the CIP treatment is performed in step 2, the air-containing voids originally present in the paper 2 are crushed by the pressurization, and then when the pressure is reduced, the air is removed from the paper 2 and the plastic film 3.
Or 4 or both 3 and 4, preferentially dispersed and gathered in the air reservoir holes 5A of the film body 5 to avoid expansion and tear of the paper 2 or local peeling of the paper 2 and the plastic film 3 or 4. Therefore, the packaging function is not impaired, and the appearance of a specific portion is not damaged.

[0021]

As described in detail above, according to the present invention, it is possible to surely prevent local breakage and breakage of paper or local delamination between the paper and the plastic film, and thus the paper packaging which is already on the market. It is possible to provide food packaging materials and containers for high-pressure processing in the form of diverting the functional form of materials or containers, promote industrial use of high-pressure food processing, and economically implement it. Is immeasurably large.

[Brief description of drawings]

1A and 1B show a packaging material according to a first embodiment of the present invention, in which FIG. 1A is an exploded perspective view and FIG. 1B is a sectional view.

FIG. 2 is an exploded perspective view showing a packaging material according to a second embodiment of the present invention.

FIG. 3 is a sectional view showing a packaging material according to a second embodiment of the present invention.

FIG. 4 is a sectional view showing a packaging material according to a second embodiment of the present invention.

FIG. 5 is an exploded perspective view showing a packaging material according to a third embodiment of the present invention.

FIG. 6 is a perspective view showing a packaging container according to an embodiment of the present invention.

7 is an enlarged cross-sectional view taken along the line aa of FIG.

FIG. 8 is a perspective view showing an assembly of packaging containers.

FIG. 9 is a sectional view showing an example of a high-pressure processing apparatus.

[Explanation of symbols]

 1 Packaging Material 2 Paper 3 Plastic Film 4 Plastic Film 5 Membrane 5A Air Reservoir 8 Packaging Container

Claims (4)

[Claims] 1. A food packaging material (1) for high-pressure treatment, comprising plastic films (3) and (4) adhered to both front and back surfaces of a paper (2) which is a shape-retaining core material. And front and back plastic film (3) (4)
A large number of air trap holes (5A) between at least one of
A food packaging material for high-pressure treatment, characterized in that the food packaging material is heavy-weighted with a film body (5) having 2. A film body (5) having air retention holes (5A)
The food packaging material for high-pressure treatment according to claim 1, wherein the food packaging material is a plastic film. 3. The food packaging material for high-pressure treatment according to claim 1, wherein a large number of micropores (2A) are dispersed and perforated in the paper (2) serving as a shape-retaining core material. . 4. A container (8) having a shape having an internal space (7) in which food can be filled and sealed using the packaging material (1) according to claim 1, 2, or 3. Food packaging container for high-pressure treatment.