JP2552552Y2 - Package - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a package, and more particularly to a package which is used for food packaging and which foams at a predetermined portion by heating.

[0002]

2. Description of the Related Art In recent years, preference has been increased for high-quality meat processed products such as ham. For example, ham is a boom of handmade products, and block-shaped hams, which are so-called irregular types, have become the mainstream, and for the purpose of differentiation and giving a sense of quality, it is practiced to wind ham on the ham or cover it with a net .
However, such a bobbin and net coating are difficult to mechanize, requiring a lot of manpower and increasing the production cost of ham.

[0003]

For this purpose, the wound state and the net covering state are printed on a package with a foaming ink obtained by converting microcapsules containing a foaming agent such as an acrylate resin into an ink using a suitable vehicle. It has been practiced to heat the ham after wrapping the ham to foam the foamed ink to make it three-dimensional. However, foaming inks have residual carcinogenic acrylic monomers and vinylidene chloride monomers, which are eluted in hot water during heat sterilization of packaged ham, and if there is a pinhole in the sealed part of the package, There is a possibility that the ham which is the contents may be contaminated through this pinhole. Further, when eating ham at home, there is a problem that if the ham is cut together with the package, the carcinogenic acrylic monomer and vinylidene chloride monomer transfer to the ham from the cut surface of the package and become contaminated.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a package that enables safe food packaging and allows a desired portion to be foamed three-dimensionally.

[0005]

In order to achieve the above object, the present invention provides a heat-shrinkable resin layer, a heat-sealing layer, and a predetermined distance between the heat-shrinkable resin layer and the heat-sealing layer. A foamed layer formed on a portion thereof, wherein the foamed layer contains calcium carbonate as a foaming agent, and the calcium carbonate reacts with water having passed through the heat-shrinkable resin layer by heating to generate carbon dioxide gas. And foamed.

[0006]

The foamed layer formed at a predetermined portion between the heat-shrinkable resin layer and the heat-sealing layer contains calcium carbonate as a foaming agent. To generate carbon dioxide gas. Then, the generated carbon dioxide gas remains in the predetermined portion, increases the gap between the heat-shrinkable resin layer and the heat seal layer, and shrinks the heat-shrinkable resin layer. Thereby, the foamed layer is made three-dimensional. Further, since calcium carbonate is used as a foaming agent and the three-dimensional foaming layer is formed by carbon dioxide gas, a carcinogenic monomer does not remain in the package, thus enabling safe food packaging.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic sectional view showing the configuration of the package of the present invention. In FIG. 1, a package 1 has a heat-shrinkable resin layer 2 and a heat-sealing layer 3, and a foam layer 4 is provided at a predetermined portion between the heat-shrinkable resin layer 2 and the heat-sealing layer 3.
Are formed. FIG. 2 is a partial plan view of the package 1 shown in FIG.
Has a foam layer 4 with a pattern in which the yarn is stretched in a mesh.
Are formed.

By heating such a package 1 in the presence of water, the foam layer 4 generates carbon dioxide gas and foams as shown in FIG. 3, and heat shrinks to lift the heat seal layer 3. In addition to increasing the gap between the conductive resin layer 2 and the heat seal layer 3, the heat-shrinkable resin layer 2 shrinks and the package 1
Will be lifted in an arch shape.

The heat-shrinkable resin layer 2 has a moisture permeability of 100 to 800 g / m ² measured at 25 ° C. for 24 hours, particularly 200 to 5 g / m ² .
It is preferable to be composed of a heat-shrinkable resin of 00 g / m ² . Specific examples of such a heat-shrinkable resin include polyamide resins such as nylon 6 and nylon 66, polyethylene terephthalate resin, and polypropylene resin.

The thickness of the heat-shrinkable resin layer 2 is 12 to 3
About 0 μm is preferable. The heat seal layer 3 is preferably selected in consideration of the adhesiveness of the contents, the releasability, etc., and includes a linear low-density polyethylene (LLDP), an ethylene-methyl-acrylic acid copolymer (EMAA), and an ethylene-acrylic acid copolymer. Coalescence (EAA), ionomer, ethylene vinyl acetate copolymer (EVA), low density polyethylene (LD
P) and the like.

The foamed layer 4 is formed by printing on a resin film constituting the heat-shrinkable resin layer 2 with a foamed ink in which calcium carbonate and an acid catalyst are added to a binder and mixed. As the acid catalyst, an organic acid such as citric acid can be used. Then, the calcium carbonate and the acid catalyst are added and mixed in the binder immediately before printing. The amount of calcium carbonate contained in the foamed ink is preferably 5 to 40% by weight, and the amount of the acid catalyst is preferably about 1 to 10% by weight. Further, as the binder used for the foaming ink, urethane-based resin,
Examples thereof include a mixture of polyvinyl chloride-based resin, acrylic resin, and polyester-based resin, and a copolymer. Further, an arbitrary color can be provided by adding an appropriate pigment to the foamed ink.

Printing using such a foamed ink can be performed by a known printing method such as gravure printing, silk printing, or flexographic printing. When the foamed layer 4 is heated in the presence of moisture, carbon dioxide is generated by the following chemical reaction. CaCO ₃ + H ₂ O → Ca (OH) ₂ + CO _{2 The} generated carbon dioxide gas is heat-shrinkable resin layer 2 and heat seal layer 3 so as to lift heat seal layer 3 as described above.
And acts to increase the gap between them. In this case, the moisture that has passed through the heat-shrinkable resin layer 2 and reached the foamed layer 4 is used. In the illustrated example, the print pattern of the foam layer 4 is a pattern in which yarns are stretched in a mesh pattern, but the print pattern is not limited to this and can be arbitrarily selected. However, a foam layer 4 is provided at a portion where the package is heat-sealed.
Is unfavorable because swelling may occur in the heat-sealed portion and cause pinholes.

As described above, the present invention is characterized in that the foamed layer 4 is foamed by generating carbon dioxide gas by heating in the presence of moisture such as boil sterilization, and the foamed layer 4 is made three-dimensional. is there. Calcium carbonate is used as a foaming agent for the foaming layer 4 and the foaming layer 4 is made three-dimensional by carbon dioxide gas, so that carcinogenic monomers do not remain in the package and safe food packaging is possible. Become.

Next, the present invention will be described in more detail with reference to experimental examples. (Experimental Example 1) The following two types of shrinkable nylon resin films were used for the heat shrinkable resin layer, and a foaming ink manufactured by Morohoshi Ink Co., Ltd. (FORM ink for HAM and citric acid in a weight ratio of 100/5) Gravure plate (plate depth 100 μm)
And two types of gravure plates having a thickness of 150 μm), and a foamed layer was formed by printing with a predetermined pattern as described above.

(Shrinkable Nylon Resin Film) Boneal S manufactured by Kojin Co., Ltd., heat shrinkage = 20%, thickness =
15 μm ・ Mitsubishi Kasei Polytech Co., Ltd. Santo Nyl SS, heat shrinkage = 15%, thickness = 20 μm Next, a urethane anchor coating agent (ester isocyanate cross-linking type) is applied to the foam layer forming surface of the shrinkable nylon resin film. Is applied by a roll coat, and a heat sealant (Ultzex 2081 manufactured by Mitsui Oil Co., Ltd.) is applied on the anchor coat layer using an extrusion coater.
C) was applied to form a heat-sealing layer having a thickness of 40 μm, thereby preparing four types of packages of the present invention.

The package prepared as described above is
The package was cut to a size of m square, boiled for 10 minutes at three temperature conditions of 70, 80, and 95 ° C., and the degree of swelling of the foam layer portion of the package after cooling was measured. The measurement results are shown in Table 1. Good swelling of the foam layer was confirmed in each package.

[0017]

[Table 1]

Incidentally, the shrinkable nylon resin film and the heat seal layer were maintained in a good laminated state in the portion where the foam layer was not formed in the package. (Experimental Example 2) A shrinkable nylon resin film (Bonille S) manufactured by Kojin Co., Ltd. was used for the heat-shrinkable resin layer, and a gravure plate having a plate depth of 100 μm was used. A package (one type) was prepared.

Next, the formed package is formed into a tubular shape so that the foamed ink printing surface faces inside (the heat seal layer faces the inner surface), and the end surfaces a, a of the package are abutted as shown in FIG. , Heat seal layer 11 and stretched nylon resin layer 12
A bag body A made by a tape seal method, which is fixed from the inside with a heat seal tape 10 which is a laminate of the above, and a tubular shape so that the foamed ink printing surface is on the outside (the heat seal layer is directed to the outside); A bag B made by a tape sealing method in which the end faces of the package were butted from outside with abutting heat sealing tape was prepared. Bag A was filled with 500 g of ham, and the top and bottom were heat-sealed and packaged. In addition, bag B
Was packed with 500 g of ham, and the top and bottom were sealed with metal clips 15 and 15, as shown in FIG. Each package was boiled at 95 ° C. for 10 minutes, and the degree of swelling of the foam layer portion of the package after cooling was measured. as a result,
A rise of 400 μm was confirmed in the foam layer portion of the package. (Experimental Example 3) A shrinkable nylon resin film (Konil S) manufactured by Kojin Co., Ltd. was used for the heat-shrinkable resin layer, and a gravure plate having a plate depth of 100 μm was used, as shown in FIG. A package (one type) of the present invention was prepared in the same manner as in Experimental Example 1, except that the foam layer 4 was not formed in the portion (heat seal portion) 5.

The package is printed with the foamed ink printed side facing inward (with the heat seal layer facing the inside).
g of ham was pillow packaged. Then, the package was boiled at 95 ° C. for 10 minutes, and the degree of swelling of the foam layer portion of the package after cooling was measured. As a result, 4
A bulge of 00 μm was confirmed. (Comparative Example 1) A package was formed in the same manner as in Experimental Example 1 using a shrinkable nylon resin film (Bonyl S) manufactured by Kojin Co., Ltd. for the heat-shrinkable resin layer. An urethane-based anchor coating agent (ester-based isocyanate cross-linking type) is applied to the non-foamed layer non-formed surface of the conductive nylon resin film by roll coating, and a heat sealing agent (Mitsui Oil (Mitsui Oil ( Co., Ltd. (Ultzex 2081C) is applied to form a heat-seal layer having a thickness of 50 μm, and a package (two types) is formed.
I got

The package produced as described above is
The package was cut to a size of m square, boiled for 10 minutes at three temperature conditions of 70, 80, and 95 ° C., and the degree of swelling of the foam layer portion of the package after cooling was measured. The measurement results are shown in Table 2.

[0022]

[Table 2]

Since the heat-sealing layer is formed on the surface of the shrinkable nylon resin film on which the foam layer is not formed, the amount of water that passes through the shrinkable nylon resin film and reaches the foam layer during boiling is greatly reduced. In each package, the swelling of the foam layer was insufficient. (Comparative Example 2) A shrinkable nylon resin film coated with the following polyvinylidene chloride (K coating) was used for the heat shrinkable resin layer, and the side of the shrinkable nylon resin film coated with polyvinylidene chloride (K coat) was used. Then, a foam layer was formed on the non-coated (non-K coated) surface side of polyvinylidene chloride in the same manner as in Experimental Example 1, and a heat seal layer was further formed via an anchor coat layer to prepare a package (four types). did.

(Shrinkable nylon resin film) UTT manufactured by Unitika Ltd., heat shrinkage = 20%, thickness =
20 μm The package prepared as described above is cut into a 10 cm square size, boiled at 70, 80, and 95 ° C. for three minutes and cooled, and the degree of swelling of the foam layer portion of the package after cooling. Was measured. Table 3 shows the measurement results.

[0025]

[Table 3]

Since polyvinylidene chloride is applied to the shrinkable nylon resin film, the amount of water that passes through the shrinkable nylon resin film and reaches the foam layer during boiling is greatly reduced. The climax was inadequate.

[0027]

As described in detail above, according to the present invention, a foamed layer formed at a predetermined portion between a heat-shrinkable resin layer and a heat seal layer generates carbon dioxide gas by heating in the presence of moisture. The carbon dioxide gas remains in the predetermined portion and increases the gap between the heat-shrinkable resin layer and the heat seal layer, and the heat-shrinkable resin layer contracts to form a three-dimensional foam layer.
In addition, since calcium carbonate is used as a foaming agent for the foam layer, carcinogenic monomers do not remain in the package, and safe food packaging is possible.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing the configuration of a package of the present invention.

FIG. 2 is a partial plan view of the package shown in FIG. 1 as viewed from a heat seal layer side.

FIG. 3 is a schematic sectional view showing a foamed state of the package shown in FIG. 1;

FIG. 4 is a diagram showing a state in which a bag is formed by a tape sealing method using the package of the present invention.

FIG. 5 is a diagram showing a state in which the top and the ground of the bag body are sealed.

FIG. 6 is a plan view showing an example of the package of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Package 2 Heat-shrinkable resin layer 3 Heat seal layer 4 Foam layer

Claims (2)

(57) [Scope of request for utility model registration] 1. A heat-shrinkable resin layer, a heat-sealing layer,
A foam layer formed at a predetermined portion between the heat-shrinkable resin layer and the heat seal layer, wherein the foam layer is a foaming agent
Wherein the calcium carbonate reacts with the moisture transmitted through the heat-shrinkable resin layer by heating to generate carbon dioxide gas and foam . 2. The heat-shrinkable resin layer has a moisture permeability of 100 to 100.
Package of claim 1, wherein it is 800 g / m ^2.