JP2003267450A - Gas barrier adhesive label - Google Patents

Abstract

(57) [Abstract] (with correction) [Problem] In addition to being able to effectively maintain the gas filling effect for a long period of time, it is also possible to prevent the inflow of oxygen from outside the container, prevent oxidation of the contents, and preserve food. Provided is an adhesive label whose properties can be dramatically improved. A gas-barrier adhesive label (3) comprising a gas-barrier substrate layer and an adhesive layer, wherein the adhesive is an acrylic adhesive or a rubber-based adhesive, and has an adhesive strength of 0.1 to 10N. / Cm, and the oxygen gas permeation amount is 1.0
A gas-barrier adhesive label having a density of １９1974.0 ml / m ² · day / MPa.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adhesive label having a gas barrier property, and more particularly to a gas barrier adhesive label suitable for sealing a gas-filled container.

[0002]

[Prior Art] In addition to the conventional form of purchasing foodstuffs at supermarkets and cooking and eating the purchased foodstuffs at each home, there is no time for cooking because of working together recently With the intention of doing household chores simply because of wanting to take them, with regard to cooking, there is an increasing number of ways to purchase pre-prepared food prepared in the backyard of a supermarket or central kitchen and eat it at home. .

On the other hand, in cooked foods in supermarkets and convenience stores, product development is actively carried out to suit the taste, quantity, etc. of individual foods for the convenience of cooked foods, and various kinds of foods are available. It has been put on the market. Also,
Even for products of the same type, supermarkets and convenience store companies can maximize the display effect by maximizing the display effect by changing the shape and design of the packaging container, resulting in various sizes of food. There are pod-shaped containers on the market.

In the field of prepared foods in particular, the amount of prepared foods that one wants to eat (the amount suitable for a small number of people or one time, etc.) and the seasoning (Kyoto-flavored food) that is desired to be eaten these days are not the same as the conventional mass sales of the same products. Etc.) is becoming available. In addition, in order to maximize the display effect in terms of design, the color of the container is changed for each food, and the market is flooded with containers of various sizes, shapes, and colors. Therefore, for prepared food sellers such as supermarkets and convenience stores, it is complicated to switch the device when packaging foods in small quantities and many kinds, and the production efficiency is reduced due to the complexity. However, the complexity of parts management of the packaging machine has been a problem.

In order to solve this problem, prepared food sellers such as supermarkets and convenience stores extend the life of prepared foods such as prepared foods to reduce the expiration date (so-called loss) of products.
We are seeking to improve productivity by reducing production brand switching. So-called gas-filled packaging, in which food is stored in a gas atmosphere suitable for it, has been known and studied as a method of storing products for a long period of time. Since the storage period of products is extended by using gas-filled packaging for food products, it is expected that production efficiency will be improved by extending the distribution of products and reducing the number of products whose storage period has expired.

Various gas filling and packaging methods have been studied so far. For example, JP-A-9-2956
Japanese Patent Publication No. 77 is characterized in that it comprises a tray portion on which contents are placed and a lid portion covering the tray, and a gas inlet is provided on the top surface of the lid and a gas outlet is provided around the lid. There is disclosed a gas filling and packaging method in which a heat-shrinkable film having a gas barrier property is used to cover the entire circumference using a tray for gas filling and packaging. In this gas filling and packaging method, the gas inlet port provided on the top surface of the lid and the exhaust port provided around the lid are covered with the gas barrier heat-shrinkable film, so that the filled gas is reliably sealed. It is excellent in that it can be done.

However, the method typified by Japanese Patent Laid-Open No. 9-295677 discloses that the gas inlet on the top surface of the lid and the gas outlet around the lid are made into a heat-shrinkable film having a gas barrier property. Since it covers the entire circumference, when heated by a microwave oven, the heat shrink film that has been wrapped begins to shrink further due to heat, and the problem of crushing the package due to the heat shrink stress of the heat shrink film remains. ing. By further heat-treating the package, the moisture contained in the food in the packaging container, the filled gas, etc. thermally expands, the internal pressure inside the package rises, the wrapped heat-shrinkable film tears with a loud noise, and the package In addition to the problem of scattering the contents of the body into the microwave oven, the container and lid are double-wrapped with a heat-shrinkable film having gas barrier properties, and the packaging material used for packaging increases, so the Container Recycling Law There is a problem that the burden on businesses based on the above will increase.

[0008]

SUMMARY OF THE INVENTION The present invention addresses the above problems by providing an adhesive label, which is a sealing method capable of accommodating various diversified sizes and shapes of containers, and particularly a gas barrier adhesive for sealing gas-filled packages. It is intended to provide a label.

[0009]

The present inventors have completed the present invention as a result of intensive studies to achieve the above object. That is, the present invention is as follows. 1) A gas barrier adhesive label comprising a gas barrier substrate layer and an adhesive layer. 2) The gas-barrier adhesive label according to 1) above, wherein the gas-barrier substrate layer is a resin layer containing a gas-barrier resin or a resin layer having a layered inorganic substance. 3) The gas barrier adhesive label as described in 1) or 2) above, wherein the adhesive is either an acrylic adhesive or a rubber adhesive.

4) The adhesive strength is 0.1 to 10 N / cm, and the oxygen gas permeation rate is 1.0 to 19744.0 ml / m.
² · day / MPa, which is characterized in that the above 1) to
The gas barrier adhesive label according to any one of 3). 5) The gas barrier adhesive label according to any one of 1) to 4) above, wherein the gas barrier adhesive label is provided with a knob portion. 6) The contents are contained in a container made of resin and a lid leaving at least one air passage, and after sealing the container and the lid, air in the container is filled with other gas through the air passage, A method for producing a gas-filled package, characterized in that the ventilation passage of the lid is sealed with the gas-barrier adhesive label described in 1) above.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, preferred embodiments of the present invention will be described in detail. The present invention is most different from the prior art in that the gas filling packaging sealing method of the prior art is a heat shrinkable film having gas barrier properties, and when heated by a microwave oven or the like, the heat shrinkage stress of the encapsulated heat shrinkable film. By crushing the package, the heat-shrinkable film covered by the internal pressure rise in the package is broken together with the sound of explosion, and the contents in the package are scattered in the microwave oven, whereas the present invention has a gas barrier property. The point is that the adhesive label can be used for heating without impairing the appearance of the package. Above, the effect based on the constituent elements in the present invention which is different from the prior art is to prevent the inflow of oxygen from the outside of the container by the gas filling effect by the gas barrier property of the adhesive label, and utilize the gas filling effect by the adhesive label. The contents can be prevented from being oxidized, the storability of food can be dramatically improved, and when the package is heated in a microwave oven or the like, the package can be heated without deteriorating the appearance of the package and the internal pressure is increased. That is, the gas in the package can be safely discharged.

The gas-barrier adhesive label referred to in the present invention has the function of sealing the gas-filled container and preventing gas from entering and exiting the inside and outside of the container (gas barrier property).
An adhesive label having The container referred to in the present invention may be anything as long as the contents can be put therein and sealed, but examples thereof include a bag and a closed container. In the case of a sealed container, after sealing the overlapping flange portion of the container and the lid, the air in the container is filled with other gas from the ventilation passage provided in the lid, and the ventilation passage of the lid is sealed with the label. is there. In the case of a sealed container, the lid covers the upper part of the container, and if the material is resin, it can be anything as long as it can cover the container containing the content, but it covers the upper part from the viewpoint of visually confirming the content. It is preferable that the lid is transparent and that the resin is transparent and has excellent gloss from the viewpoint of beauty. Further, regarding the relationship between the height of the container and the lid, it is preferable that the height of the container is lower than the height of the lid that covers the upper portion, from the viewpoint that the display effect of the container exerts a feeling of volume of contents. The shape of the container in the present invention may be a rectangular parallelepiped, a cylinder, a cone, a polygon, a polyhedron, a cylinder, or a combination thereof, without any problem. Further, the sealing of the ventilation passage provided in the lid by the label means that the label is adhered while straddling the ventilation passage (hole) provided in the lid.

The resin used for the container or the lid means a thermoplastic resin or a thermosetting resin, but any resin generally used for the container or the lid may be used. For example, as the thermoplastic resin, polyethylene resin, polypropylene resin, polystyrene resin, methacrylic resin, polyvinyl chloride resin, polyamide resin, polycarbonate resin, polyethylene terephthalate resin, polybutylene terephthalate resin, cellulose acetate resin, ethylene-vinyl alcohol copolymer Examples thereof include resins (EVOH and the like), and examples of thermosetting resins include urea resins, melanin resins, xylene resins, phenol resins, unsaturated polyester resins and the like, and homopolymers or copolymer resins thereof. The bag, the container, and the lid are made of a film or sheet having a single-layer structure or a multi-layer structure made of these resins.

The gas-barrier adhesive label according to the present invention has a planar shape, and an adhesive agent is present on the surface that comes into contact with the lid, and the ventilation passage provided in the lid is sealed through the adhesive agent without any gap. It can be (sealed), and may have any shape as long as it can be hermetically sealed so as not to dissipate the gas in the packaging container, and the planar shape of the adhesive label is a square (A in FIG. 4) or a rectangle (A in FIG. 4). B), a quadrangle with corners having R (C in FIG. 4), a polygon (D in FIG. 4),
Circle (E in FIG. 4), semicircle (F in FIG. 4), ellipse (G in FIG. 4), semi-ellipse (H in FIG. 4), star (I in FIG. 4), indeterminate (J in FIG. 4) ), Circle + knob (K in FIG. 4), rectangle + knob (L in FIG. 4), ellipse + knob (M in FIG. 4), square +
A knob (N in FIG. 4) and the like can be mentioned.

As a material for the gas barrier adhesive label,
A single layer or a multi-layered structure composed of paper, a metal thin film, a resin and the like can be mentioned, but it is more preferably composed of a resin which is the same material as the container from the viewpoint of separation and collection. Further, a material containing no metal such as a metal thin film or metal vapor deposition from the viewpoint of preventing sparks due to the collision of electrons during heating in a microwave oven,
From the viewpoint of preventing the dissipation of gas, a gas barrier resin is more preferable. Further, the gas-barrier adhesive label of the present invention preferably has a certain level of strength from the viewpoint of preventing breakage due to piercing from the outside. In the measurement based on Article 10 of the Agriculture and Forestry Standard, the puncture strength is preferably 2.0 N or more, more preferably 2.5 N or more, and further preferably 3.0 N or more.

The gas barrier adhesive label referred to in the present invention is
There are two types of gas barrier substrate layer and adhesive layer.
Divided into layers. The gas barrier substrate layer referred to in the present invention is
It is necessary to have a barrier property and carbon dioxide
Elementary gas permeation rate 1.0 to 4935.0 ml / m²・ Da
y / MPa, oxygen gas permeation amount is 1.0 to 3948.0 m
l / m²・ Day / MPa (0.1 to 400 cc / m²・
24 hr.atm), nitrogen gas permeation amount is 1.0 to 148
0.5 ml / m²・ Preferable one having day / MPa
And more preferably, the carbon dioxide gas permeation amount is 10.0.
~ 4500.0 ml / m²・ Day / MPa, oxygen gas
Permeation rate is 10.0 to 2500.0 ml / m²・ Day /
MPa, nitrogen gas permeation rate 10.0-1300.0 ml
/ M²・ Has a value of day / MPa
More preferably, the carbon dioxide gas permeation amount is 20.0 to 4000.
0 ml / m ²・ Day / MPa, oxygen gas permeability is 2
0.0 to 1300.0 ml / m²・ Day / MPa, Nitrogen
Elementary gas permeation rate is 20.0 to 1000.0 ml / m²・ D
It has ay / MPa. Even more preferred
Has a carbon dioxide gas permeation rate of 20.0 to 1000.0 ml
/ M²・ Day / MPa, oxygen gas permeation amount is 20.0 ~
300.0 ml / m²・ Day / MPa, nitrogen gas permeation
Volume is 20.0 to 250.0 ml / m²・ Day / MPa
Is to have.

Of the gas barrier substrate layer used in the present invention
The thickness depends on the oxygen gas permeation amount of the resin used.
The above-mentioned oxygen gas permeation amount is 1.0 to 19744.0 ml.
/ M ²・ It is preferable to secure a thickness of day / MPa.
Good For example, ethylene-vinyl chloride, which has a low oxygen gas permeability,
In the case of nyl alcohol copolymer resin (EVOH), acid
Oxygen gas permeation amount is about several μm from the viewpoint of elementary gas permeation amount
It is possible to achieve the waist as an adhesive label
Because the label is scarce
Poor rate, and has a different attitude from the viewpoint of handling the label
Resins such as polypropylene resin (PP),
It is necessary to laminate with a polyester resin (PET). P
In the case of a gas barrier substrate layer having a laminated structure of P and EVOH
In this case, the oxygen gas permeation rate is 1.0 to 19744.0 ml / m²
・ Day / MPa is preferable, gas barrier
The thickness of the base material layer is 20 to 150 from the viewpoint of the waist of the adhesive label.
μm is preferred. Further, more preferably 30 to 120 μ
m, and more preferably 35 to 115 μm.

The resin used in the gas barrier substrate layer used in the adhesive label of the present invention preferably has an oxygen gas permeation amount of 1.0 to 1974.0 ml / m ² · day / MPa, and food packaging There is no problem as long as it is a resin used for the purpose, and it is not particularly limited as long as a film using the resin is cut into a band shape. For example, polyethylene resin (HDPE, LLDPE, etc.), polypropylene resin (PP), polybutene-1 resin (PB),
Polyolefin resin (PO) including poly-4-methylpentene-1 resin, ethylene-vinyl acetate copolymer resin (EVA), ethylene-methyl methacrylate copolymer resin (EMA, etc.), ethylene- Polyolefin resin modified products (PO modified products) including vinyl alcohol copolymer resins (EVOH etc.), polyethylene terephthalate (modified) resins (PET etc.),
Polybutylene terephthalate-based (modified) resin (PBT
Etc.) as a part, or a polyester resin (PET) of a polylactic acid resin, an aliphatic component such as a polyglycolic acid resin, or a polyglycolic acid resin, polyvinylidene chloride resin (PVDC), poly Vinyl chloride resin (P
VC) and other chlorine-based resins, α-olefin-carbon monoxide copolymer resin (containing hydrogenated resin), α-olefin (ethylene, etc.)-Styrene copolymer resin (containing hydrogenated resin),
A single layer or a multilayer of these resin compositions selected mainly from at least one of ethylene-cyclic hydrocarbon compound copolymer resin (containing hydrogenated resin), polyamide resin (Ny), caprolactone resin, etc. Examples thereof include those obtained by laminating a resin different from this layer, or stretched or unstretched labels made of these resins. Among them, polyethylene resin (especially HDPE), polypropylene resin (PP) from the viewpoint of heat resistance and gas barrier property. ), Ethylene-vinyl alcohol copolymer resin (EVOH, etc.),
Polylactic acid-based resin partially containing aromatic components such as polyamide-based resin (Ny), polyethylene terephthalate-based (modified) resin (PET, etc.), polybutylene terephthalate-based (modified) resin (PBT, etc.) Polyester resin (PET), which is an aliphatic component such as polyglycolic acid resin, is preferable. Further, within a range that does not impair the effects of the present invention, known additives such as antioxidants, light stabilizers, antistatic agents, antifogging agents, colorants, lubricants, and the like, known surface treatment. For example, a gas barrier coating treatment such as corona discharge treatment, flame treatment, irradiation treatment including electrons / plasma, ion etching treatment, vinylidene chloride or the like may be performed.

As the gas barrier substrate layer used in the adhesive label of the present invention in the present invention, a resin layer having a layered inorganic substance may be provided to form the gas barrier substrate layer. For example, a low density polyethylene resin layer having a poor gas barrier property may be provided with a gas barrier property by an evaporation treatment of an inorganic substance of silica and / or alumina. Next, the adhesive layer of the gas barrier adhesive label for enclosing a gas filled package according to the present invention will be described. First, the term “adhesion” as used in the present invention means that a gas barrier adhesive label for sealing gas-filled packaging and a bag, a container or a lid are attached. Adhesive strength may be appropriately selected, and the kind of adhesive, coating amount, etc. may be selected according to the desired adhesive strength, and even if the adhesive has weak adhesive strength, it is a gas barrier adhesive label and bag for gas filling packaging encapsulation. It suffices if the container and lid can be attached and sealed. Typical adhesives include solvent type, hot melt type, reactive type, etc., but there is no problem as long as they have adhesive properties, for example, rubber adhesive, acrylic adhesive, vinyl ether adhesive. Agent,
Examples thereof include silicone adhesives and resin compositions selected mainly from at least one of these. From the viewpoint of easily setting a desired adhesive strength, a rubber adhesive, an acrylic adhesive, a vinyl ether adhesive, and more preferably a rubber adhesive or an acrylic adhesive. Further, acrylic adhesives are even more preferable from the viewpoint of less solvent extract and less impurities. Further, these adhesives are known additives, for example, antioxidants, light stabilizers, within a range that does not impair the effects of the present invention.
It may contain an antistatic agent, an antifogging agent, a coloring agent and the like.
Further, in order to intentionally cause partial peeling between the gas barrier base material layer and the adhesive layer of the gas barrier adhesive label for gas filling packaging and sealing of the present invention, silicone or the like having a peeling effect on the gas barrier base material layer is previously prepared. It may be provided with so-called tamper-proof printing in which printing is performed and the adhesive layer is peeled off from the gas barrier base material layer and remains on the bag, container or lid that is the adherend.

Examples of rubber adhesives include cis-
Natural rubber containing 1,4-polyisoprene as a main component, styrene-butadiene rubber (SBR), polyisobutylene,
At least one type is selected from synthetic rubber containing butyl rubber or the like as a main component, or block rubber containing styrene / butadiene / styrene copolymer rubber (SBS) or styrene / isoprene / styrene copolymer rubber (SIS) as a main component. Adhesive elastomer, rosin resin, terpene resin, petroleum resin, which is a thermoplastic resin of amorphous oligomer (dimer or higher medium molecular weight polymer) having a molecular weight of several hundred to about 10,000 in liquid or solid at room temperature. Resins, adhesion promoters such as chroman-indene resin, and softeners such as mineral oil, liquid polybutene, liquid polyisobutylene, and liquid polyacrylic acid ester are included.

As the acrylic adhesive, for example, a main monomer that gives an adhesive property, which is typically represented by a homopolymer having a low Tg, such as an acrylic acid alkyl ester, a lower alkyl group acrylic acid ester, a methacrylic acid alkyl ester, and vinyl acetate. Adhesion of comonomers that can be copolymerized with main monomers such as styrene, acrylonitrile, etc. to give cohesiveness to increase Tg, carboxyl group-containing monomers such as acrylic acid or methacrylic acid (acrylate etc.), hydroxyl groups, epoxy groups, amino groups, etc. The adhesive reaction product of the functional group-containing monomer that gives properties and serves as a cross-linking point may be blended with the above-mentioned adhesion-imparting agent, softening agent and the like in some cases.

The vinyl ether-based adhesive is, for example, a homopolymer such as vinyl methyl ether, vinyl ethyl ether, vinyl isobutyl ether or a copolymer with acrylate (adhesive elastomer), and in some cases, the above-mentioned adhesion-imparting agent, softening agent, etc. The thing which mix | blended is mentioned. Examples of the silicone-based adhesive include a polymer (or an adhesive elastomer) having a residual silanol group (SiOH) at the end of a polymer chain represented by high molecular weight polydimethylsiloxane or polydimethyldiphenylsiloxane, and the above-mentioned adhesion-imparting agent, Some include a softening agent.

Acrylic adhesives are preferred from the viewpoints of gas barrier properties, particularly gas filling packaging, since the adhesive strength can be widely set, and from the viewpoint of food hygiene. The adhesive strength in the present invention is preferably 0.1 to 10 N / cm in the measuring method by the 180-degree peeling method of JIS-Z-0237 from the viewpoint of the adhesive strength at the time of adhesion and the peel strength at the time of peeling. More preferably 0.2 to 9.5 N / c
m, and even more preferably 0.3 to 7.5 N / cm.

The thickness of the adhesive layer used in the present invention varies depending on the adhesive used, but the adhesive strength is 0.1 to 1.
It may be 0 N / cm and does not depend on the thickness of the adhesive layer. For example, in the case of an acrylic adhesive, the thickness of the adhesive layer is preferably 3 to 50 μm from the viewpoint of adhesive strength. Further, it is more preferably 5 to 40 μm, further preferably 8 to 35 μm. The gas barrier adhesive label of the present invention may be provided with a knob to impart easy opening property. For example, it is preferable to provide the gas barrier adhesive label with a semi-circular knob and provide easy opening such as easy opening by pulling up the knob from the lid in order to prevent the package from bursting when heated. More preferable. Further, by using an acrylic emulsion as the adhesive of the label, the adhesive strength of the adhesive is weakened by the steam from the contents when the package is heated, and a part of the label is automatically changed by the internal pressure in the package. It may be opened to prevent bursting.

The gas-filled packaging referred to in the present invention will be described. The gas-filled packaging referred to in the present invention means a packaging in which a desired gas is filled with air in a hermetically-sealed container, and effects such as appearance improvement relating to the preservation quality of the contents and the color of the product can be mentioned. Etc. in an inert gas to prevent oxidation of oils and fats, preservation of active ingredients such as vitamins, prevention of decay due to fungus, fungi and yeast breeding, prevention of discoloration and discoloration of pigments, prevention of fragrance scattering, etc. The effect is obtained. Further, it may be possible to further improve the storability of the contents by filling with a gas having a bacteriostatic action such as carbon dioxide.

Any known gas may be used as the above gas. Examples thereof include nitrogen, carbon dioxide (carbon dioxide gas), oxygen, and argon, which can be used alone or in combination. In addition, ozone or natural and synthetic antibacterial substances (for example, hinokitiol, etc.) generally known for the purpose of sterilizing molds, fungi and yeasts may be used. Generally, the gas filling method of the gas filling device includes a chamber type and a gas flush type. The chamber-type gas filling method is a method in which the entire interior of the chamber is temporarily degassed to a vacuum state and then the filling gas is sent to fill the gas, and generally the chamber-type gas filling is performed by filling the filling gas. High rate,
It has a feature that gas can be reliably filled. On the other hand, in the gas flush type gas filling method, the filling gas is directly flushed into the container containing the contents, and the air in the container is expelled by the filling gas to perform the gas filling. It is generally said that the gas flush type has a lower filling rate than the chamber type, but a desired gas filling rate can be obtained by adjusting the gas flush time. The gas flush type is cheaper than the chamber type in terms of equipment, and it is possible to suppress the capital investment cost of the vendor. The gas filling method of the gas filling device according to the present invention depends on the content (type and shape) in the container, the packaging speed, the installation space, the gas filling rate, etc. by the gas filling method described above or any other method. It may be selected as appropriate.

The brim-shaped connecting portion that overlaps when the space between the container and the lid is superposed is called a flange portion of the container. A fitting function may be added to the flange portion. The fitting function has a shape in which a groove for fitting between the container and the lid is provided in a flange portion of the container and the lid, and exerts an effect of fastening (fitting) the lid and the container. The fitting shape is roughly divided into three types, namely outer fitting, inner fitting, and inner outer fitting. The outer fitting is a shape that does not require much precision of a mold for molding a container and can be easily manufactured at low cost. On the other hand, inner fitting requires higher mold precision when molding the container than outer fitting, and it is costly, but if the contents are prepared foods containing juice, etc. Can be prevented from flowing out. In addition, the inner and outer mating requires a high precision of the mold for molding the container and is quite effective in terms of cost, but the mating strength of the mating part is strong, and the container and lid can be removed even if some impact is applied. It is the highest quality fitting shape without

The contents in the present invention are mainly foods, and in addition to fresh fish called 3 fresh products, raw meat and raw vegetables, side dishes (boiled, grilled, steamed, stir-fried) sold at supermarkets, convenience stores and the like. Items), bento, etc. (1) Adhesive strength Measured by the 180-degree peeling method of JIS-Z-0237. The outline of the measuring method is shown below. A label having a width of 25 mm was attached to a stainless steel plate, and the force required for peeling one end of the label from the test plate toward the other end in a 180 degree direction at a peeling speed of 300 m / min was used.

(2) Puncture strength Based on Article 10 of the Agriculture and Forestry Standard, the label is fixed to a 125 mm square frame, the center of which has a diameter of 1.0 mm and a tip shape of 0.
A 5 mmR needle was pierced at a speed of 50 mm / min, the maximum load until the needle penetrated was measured, and the value was taken as the strength. (3) Oxygen gas permeation amount measurement Measured according to ASTM-D-3985 (measurement temperature 2
3 ° C).

(4) Oxygen composition ratio measurement in container space The oxygen composition ratio (%) in the container space at 23 ° C. and 50% RH was measured using a checkpoint manufactured by PBI Dansensor Co., Ltd. ◯: The oxygen composition ratio in the container after 30 days is less than 1%. Δ: The oxygen composition ratio in the container after 30 days is 1% or more and less than 2%. X: The oxygen composition ratio in the container after 30 days is 2% or more.

[Example] Polypropylene resin (PP) and ethylene-vinyl alcohol copolymer resin (EVOH)
800 μm sheet of PP / EVOH / PP (oxygen permeability 4.9 ml / m ² · day / MPa)
Was molded into the shape shown in FIG. 1 (container) and FIG. 2 (lid), and each flange was sealed by heat sealing. The inside volume of the container was 200 cm ³ , and high-purity nitrogen gas (purity 99.99%) was filled in the container through a ventilation path, and the ventilation path of the container (diameter 15 mm circle-E in FIG. 4).
Was sealed using the gas barrier adhesive label shown in Table 1 (FIG. 3). Then, the oxygen composition ratio in the container was measured immediately after sealing and 30 days after the sealing, and the results are shown in Table 1.

[0032]

[Table 1]

[0033]

EFFECTS OF THE INVENTION The present invention is an adhesive label having a gas barrier property, whereas the conventional adhesive label has a poor gas barrier property and is not suitable for sealing a gas-filled package. In addition to being able to effectively maintain the gas filling effect for a long time, it can prevent the inflow of oxygen from the outside of the container, prevent the oxidation of the contents, and dramatically improve the preservability of food. Moreover, it is a sealing method that makes it easy to open the lid from the container even for elderly people.

[Brief description of drawings]

FIG. 1 is a perspective view of a lid used in an example. An air passage 4 is provided on the top plate surface of the lid.

FIG. 2 is a perspective view of a container used in an example.

FIG. 3 is a perspective view showing a state in which the container used in the embodiment and the lid are overlapped with each other and the ventilation passage 4 is sealed with the label of the present invention.

FIG. 4 is an example showing a shape of a label.

[Explanation of symbols]

1 lid 2 containers 3 Gas barrier adhesive label 4 air passage

Claims (6)

[Claims] 1. A gas barrier adhesive label comprising a gas barrier substrate layer and an adhesive layer. 2. The gas-barrier adhesive label according to claim 1, wherein the gas-barrier substrate layer is a resin layer containing a gas-barrier resin or a resin layer having a layered inorganic substance. . 3. The gas barrier adhesive label according to claim 1 or 2, wherein the adhesive is either an acrylic adhesive or a rubber adhesive. 4. The adhesive strength is 0.1 to 10 N / cm, and the oxygen gas permeation rate is 1.0 to 19744.0 ml / m ^2.
-Day / MPa, Claims 1-3 characterized by the above-mentioned.
5. A gas barrier adhesive label according to any one of 1. 5. The gas barrier adhesive label according to any one of claims 1 to 4, wherein the gas barrier adhesive label is provided with a knob portion. 6. A container made of resin and a lid in which at least one air passage is left, the contents are contained, and after sealing the container and the lid, air in the container is replaced with other gas from the air passage. A method for producing a gas-filled package, which comprises filling and sealing the air passage of the lid with the gas-barrier adhesive label according to claim 1.