JP2003327269A - Packaging material with oxygen indicator and packaged body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a packaging material with an indicator and a packaged body using the same, of which the indicator has a sufficient sealing capability and quickly changes its color upon detecting oxygen, for a packaging material with an oxygen indicator which comprises the oxygen indicator made by printing an ink part having an oxygen detecting function on a base film and a heat seal layer, composed of a thermally weldable resin, that is formed on the same surface of the base film printed with the oxygen indicator. <P>SOLUTION: The packaging material with the oxygen indicator that is not coated with a heat seal layer is provided. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a packaging material with an oxygen indicator for detecting retention of a gas substitution state or a deoxygenation state in a nitrogen or carbon dioxide gas substitution packaging or a deoxygenation packaging of foods and pharmaceuticals, and the same. Regarding packaging.

[0002]

2. Description of the Related Art Nitrogen or carbon dioxide gas replacement packaging and deoxygenation packaging are used for the purpose of preventing deterioration of foods and pharmaceuticals due to oxygen. For this purpose, when the contents such as foods and pharmaceuticals are hermetically packaged with a gas barrier packaging material, the headspace gas in the package can be sealed with nitrogen gas by blowing hermetically while blowing nitrogen gas or carbon dioxide gas into the package. A method of substituting with carbon dioxide gas, a method of deoxidizing by encapsulating an oxygen absorbent together with the contents in the package, and the like are adopted.

In such packaging, it is necessary to maintain a gas replacement state or a deoxygenated state from the time the contents are packaged until the contents are opened. Due to various factors such as reduced capacity of oxygen agent, reduced barrier properties of packaging materials, pinholes, incomplete sealing, etc., gas replacement or deoxidation may occur. May not be retained. Moreover, even if the gas state inside the package changes in this way, it is often impossible to detect it visually.

Therefore, in order to make it possible to visually recognize that the gas replacement state or the deoxidized state is maintained, an oxygen indicator that changes color with or without oxygen, that is, has an oxygen detection function is used. . Most of the conventionally used oxygen indicators are tablet-type, and the tablet-type oxygen indicator was put in the package together with the contents for use.

However, when such a tablet-type indicator is used, it takes time and effort for a maker who packs and packs foods and pharmaceuticals to prepare and pack a separate indicator in addition to the packing material. However, there is a problem that the indicator may be accidentally swallowed or eaten by mistake. Therefore, the inventors have been earnestly researching and developing a packaging body in which an oxygen indicator is integrally provided on the packaging material, in which an ink having an oxygen detection function is printed on the base material film of the packaging material. It was

On the other hand, as a packaging form for foods and pharmaceuticals at present, a flexible plastic film is used as a pouch, or a hard container molded by injection molding or vacuum molding is covered with a plastic film and hermetically sealed. Although the form is becoming mainstream, it is essential that the plastic film used for such a packaging form can be heat-sealed (heat-sealed). Therefore, as a constitution of such a plastic film packaging material, characters and designs are printed on the inner surface (inner surface of the packaging material) of the base film having barrier properties and printability, and heat is applied on top of it. A general structure is one in which a heat-fusible resin layer is provided as the seal layer.

[0007]

Therefore, in the case of a packaging body in which an oxygen indicator is integrated with a packaging material, that is, a packaging body in which an indicator ink is printed on a base material film, the constitution is a base material having a gas barrier property. The indicator ink is generally printed on the inside of the film (the inner surface when the package is formed), and the heat-fusible resin layer is provided thereon.

However, in order for the oxygen indicator to detect the presence or absence of oxygen and to change the color quickly, it is ideal that the oxygen indicator is in contact with the space in the package in this case. If the heat-fusible resin layer is provided between the indicator and the space inside the package, the detection speed will inevitably slow down.

[0009]

In order to solve the above problems, the present invention has the following constitution. According to the invention of claim 1, an oxygen indicator portion formed by partially printing an ink having an oxygen detecting function on a base film, and a surface of the base film on which the indicator is printed are provided with a thermal adhesive property. A packaging material with an oxygen indicator, comprising a heat-sealing layer formed by laminating a resin, wherein the oxygen indicator portion is not covered with the heat-sealing layer.

According to the second aspect of the present invention, the heat-sealing layer made of a heat-fusible resin is pattern-coated with a heat-sealing coating agent which is a solution in which a resin component is dissolved or dispersed in a solvent. The packaging material with an oxygen indicator according to claim 1, which is a layer.

A third aspect of the present invention is a packaging body, which is produced by using the packaging material with an oxygen indicator according to the first or second aspect.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be specifically described. The packaging material with an oxygen indicator in the present invention is a heat-fusible resin layer having a pattern in which an ink having an oxygen detection function is partially printed on a base film having an oxygen barrier property and the ink portion is avoided on the same surface. Is a packaging material film having a structure coated with, and a pouched form using the packaging material film, or a form using the packaging material film as a lid material for a plastic container, and other sealing property using the packaging material film. Any form of packaging may be used as long as it can maintain

The base film used for the packaging material is
It is necessary to be able to recognize the discoloration of the indicator from the outside,
Further, since it is necessary to have a gas barrier property in order to prevent oxygen from entering the package from the outside, a silica vapor deposition film, vinylidene chloride coated film or other transparent barrier film is preferable. Further, when it is difficult to directly print the indicator ink on the transparent barrier substrate, the indicator ink may be once printed on the printing substrate, and then the barrier substrate and the adhesive may be attached using an adhesive.

The oxygen indicator ink has a basic composition in which a redox dye and a reducing agent are the main components of the oxygen detection function, and a binder resin and a solvent, which are the basic constituent materials of the printing ink, are combined, and a moisturizer and a color tone adjustment are also added. A coloring pigment for use was added. As the redox dye, methylene blue, new methylene blue, neutral red, indigo carmine, safranin T, phenosafranine, capri blue, nile blue, diphenylamine, xylene cyanol, nitrodiphenylamine, ferroin, N-phenylanthranilic acid and the like can be used. Particularly preferred is methylene blue. Examples of the reducing agent include ascorbic acid, erythorbic acid and salts thereof, ascorbate, D-arabinose, D-erythrose, D-galactose, D-xylose, D-glucose, D-mannose, D-fructose, D-lactose. Reducing sugars such as and metal salts such as stannous salt and ferrous salt can be used. The binder resin is used to fix each ink component on the substrate, and is preferably a resin having both a hydrophilic group and a hydrophobic group. Specific examples thereof include polyvinyl acetal resin, methyl cellulose, ethyl cellulose, hydrophilic group-introduced polyester resin, and the like, and polyvinyl acetal resin is particularly preferable. As the solvent, those capable of uniformly or stably dissolving or dispersing each of the above-mentioned ink components are desirable. Specifically, an aromatic hydrocarbon, an aliphatic hydrocarbon, esters, alcohols, water, etc., which are suitable for the selected ink component, are selected and used.

As the coating agent for pattern-coating the heat-fusible resin layer, ethylene vinyl acetate copolymer resin, vinyl chloride resin, polyester resin, acrylic resin, polyolefin resin, etc. are used as the main component and these are mixed with water and others. The coating solution dispersed or dissolved in the solvent can be used. The pattern coating method using such a coating solution can be carried out using an existing printing device or coating device, and therefore the present invention can be easily carried out.

As a method of printing the indicator ink and a method of coating the coating agent, it is preferable to use a gravure printing machine or a roll coater suitable for printing or coating on a flexible film substrate.

[0017]

EXAMPLES Examples of the present invention will be specifically described below, but the present invention is not limited thereto. The materials used in the examples are as follows. Transparent barrier base material film Silica vapor-deposited polyethylene terephthalate film Printing base material Polyethylene terephthalate film Oxygen indicator ink Methylene blue ... 1.0 copy Red No. 106 ...・ ・ ・ ・ ・ ・ ・ ・ ・ 0.2 parts Ascorbic acid ・ ・ ・ ・ ・ ・ ・ ・ ・ 2.5 parts Polyvinyl acetal resin ・ ・ ・ ・ ・ 10 parts n-Propanol ・ ・······· 36.3 parts Water ········ 50 parts Heat-sealable coating agent Ethylene vinyl acetate-based water-soluble coating Agent

<Example> FIG. 1 is a partial explanatory view showing a cross section of a packaging material film with an oxygen indicator of the present embodiment, and FIG. 2 is a partial explanatory view showing a plane. Oxygen indicator ink with a diameter of 1 cm on the base film for printing
With the pattern pattern of No. 2, the indicator part 2 is printed at a pitch such that one indicator can be inserted per pouch when it is formed into a pouch, and the transparent barrier substrate film is attached to the indicator part 2 on the side opposite to the printed surface. The substrate film 1 having the indicator portion 2 printed thereon was used. Next, the surface of the base film 1 on which the indicator is printed is pattern-coated with the above heat-seal coating agent only on a portion to be heat-sealed when forming a pouch to form the heel sheet layer 3, and a packaging material with an oxygen indicator. I got a film.

Comparative Example 1 Using the oxygen indicator-printed substrate film obtained in the same manner as in Example, the surface of the substrate on which the indicator was printed was coated with the heat seal coating agent.

<Comparative Example 2> Using the oxygen indicator-printed substrate film obtained in the same manner as in Example, a thickness of 30 μm was formed on the surface of the substrate on which the indicator was printed.
The low density polyethylene film of No. 1 was attached using an adhesive.

Using the packaging material films with oxygen indicators of the above-mentioned Examples and Comparative Examples, this was measured at 10 cm × 2.
The bag is made into a 0 cm pouch, an oxygen absorbent is put into the pouch, the inside of the pouch is replaced with nitrogen, and the bag is sealed, and the discoloration speed of the indicator to anoxic color is measured. Was introduced and the rate of color change of the indicator to an aerobic color was confirmed.

As a result, as shown in Table 1, the discoloration speed in the examples was faster than that of the comparative examples in both the oxygen-free color and the aerobic color, and the discoloration was completed within 1 day.

In order to confirm the influence of the pattern coating of the heat-sealing agent on the sealing performance, the strength of the sealed portion of the pouch made into a bag was evaluated, and at the same time, the pouch of the above size was filled with 100 g of peanuts. Packing these 50 pieces into a cardboard box, 1,000 km round trip
Transport tests were also conducted. Seal strength measurement condition is 15m
m width, pulling speed 300 mm / min, using a tensile tester.

As a result, as shown in Table 2, it was confirmed that the pattern coats of the examples also had a practically satisfactory sealing performance.

[0025]

[Table 1]

[0026]

[Table 2]

[0027]

As described above, according to the packaging material with an indicator of the present invention and the packaging using the same, even if the heat-fusible resin layer is provided, the sealing performance is sufficient. It is possible to provide a packaging material with an indicator that detects the presence or absence of oxygen and quickly discolor, and a packaging body using the packaging material.

[Brief description of drawings]

FIG. 1 is a partial explanatory view showing a cross section of a packaging material film with an oxygen indicator of the present embodiment.

FIG. 2 is a partial explanatory view showing a plane of the packaging material film with an oxygen indicator of the present embodiment.

[Explanation of symbols]

1 ... Base film 2 ... Indicator section 3 ... Heel seat layer

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Toshiyuki Maeda             1-5-1 Taito, Taito-ku, Tokyo Toppan stamp             Imprint Co., Ltd. F-term (reference) 2G042 AA01 BB09 CA01 CB01 DA03                       DA08 FA05 FA13 FB07 FC02                       HA07                 3E067 AB01 AB81 CA24 CA30 EA06                       EB01 EE42 EE47 FC01                 3E086 AB01 AD01 BA04 BA15 BA24                       BB51 CA01 CA28                 4F100 AA20C AK01B AK42A AT00A                       BA02 BA03 BA10A BA10B                       BA44B DB18 EH66C GB16                       GB23 GB66 HB31B JD02                       JL12B

Claims (3)

[Claims] 1. An oxygen indicator part formed by partially printing an ink having an oxygen detecting function on a base film,
In a packaging material with an oxygen indicator, which is composed of a heat-sealing layer formed by laminating a heat-fusible resin on the same surface as the printed surface of the indicator of the base film,
A packaging material with an oxygen indicator, characterized in that the oxygen indicator part is not covered by the heat seal layer. 2. A heat-sealing layer made of a heat-fusible resin is a layer formed by pattern coating using a heat-sealing coating agent which is a solution in which a resin component is dissolved or dispersed in a solvent. The packaging material with an oxygen indicator according to claim 1, which is characterized in that. 3. A packaging body produced by using the packaging material with an oxygen indicator according to claim 1 or 2.