JP2003246973A - Gas-barrier adhesive tape - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gas-barrier adhesive tape capable of effectively retaining a gas-substitution effect for a long time. <P>SOLUTION: The gas-barrier tape comprises a gas-barrier substrate layer and an adhesive layer. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Conventionally, as a material for sealing a container containing a food or the like, a resin container and a resin film or lid are generally used. The general sealing method is to put the contents in a container, cover the opening of the container with a film (or a lid) and fix it, and then seal the part to be sealed, that is, the flange part of the container. Place the device so that it fits into the seal mold of the device, and while the contact plate corresponding to the seal mold descends from the upper surface and clamps the flange part, heat (or press) the flange part from both or one of the contact plate and the seal mold. Then, the container and the lid are sealed by heat sealing. Also, do not heat seal,
For example, in the case of an adhesive seal, apply adhesive or the like to the flange portion between the container and the lid before sandwiching,
Similarly, the container and lid are sealed by pressing with a sealing tool.

Japanese Unexamined Patent Publication No. 4-189721 discloses an insulating base plate in which a heating element is arranged at the edge of a hole formed in a plate-shaped body, and a flange portion of a container is provided on the plate-shaped body. Then place the container, insert the contents, cover with a mount (lid),
Disclosed is a method of transporting with a conveyor device, then a pressing plate descends from the upper part to sandwich the flange part between the upper and lower parts, and heat-sealing the container and the mount (lid) with a heated mold tool of the sealing device. Has been done. Since this method does not heat the mount (lid) side, deformation (distortion) due to heat of the lid material does not occur,
The advantage is that it can be packaged nicely.

However, in the method and apparatus represented by Japanese Patent Laid-Open No. 4-189721, there is provided a seal type tool in which heating elements corresponding to various containers of different sizes and designs are arranged. It is necessary, and there is a problem that it costs a lot of money to make such a dedicated seal mold for each container, and it takes time and labor to replace them, and
It is also difficult to store and manage. In this way, the burden on the trader is considerable, both financially, in terms of location and personnel, and there is a problem that it is not possible to deal with various types of containers that are becoming more and more diversified in the future.

Therefore, a method of sealing the opening of the container with an adhesive tape has been implemented. However, conventionally,
The adhesive tape used for sealing is an adhesive tape with poor gas barrier properties such as paper tape, vinyl chloride tape, polypropylene tape, cellophane tape, etc. As a result, the replacement gas flows out, or oxygen flows in from the outside of the container to impair the gas replacement effect.

[0006]

SUMMARY OF THE INVENTION The present invention addresses the above problems by providing an adhesive tape, which is a sealing method capable of accommodating diversifying containers of various sizes and shapes, and more particularly, a gas barrier adhesive for sealing gas displacement packaging. Intended to provide tape.

[0007]

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 tape comprising a gas barrier substrate layer and an adhesive layer. 2) The gas barrier adhesive tape according to 1) above, wherein the gas barrier substrate layer is a resin layer containing a gas barrier resin or a resin layer having an inorganic substance in a layered form. 3) The gas barrier adhesive tape according to 1) or 2) above, wherein the adhesive is an acrylic adhesive or a rubber adhesive. 4) Adhesive strength is 0.1 to 10 N / cm, and oxygen gas permeation rate is 1.0 to 19744.0 ml / m ² · day / M.
Pa is the gas barrier adhesive tape according to any one of 1) to 3) above. 5) The gas barrier adhesive tape according to any one of 1) to 4) above, which comprises a cut tape in the longitudinal direction of the gas barrier adhesive tape. 6) Put the contents in a container and lid made of resin,
A method for producing a gas replacement package, characterized in that the air in the container is replaced with another gas, and the flange portions of the container and the lid are sealed with the gas barrier adhesive tape described in 1) above.

[0008]

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 adhesive tape of the prior art has a poor gas barrier property and is not suitable for sealing a gas displacement package, whereas the present invention is an adhesive tape having a gas barrier property. Above, the effect based on the constituent elements in the present invention, which is different from the prior art, is that the gas replacement effect can be effectively maintained for a long time, oxygen inflow from the outside of the container can be prevented, and the content can be oxidized. It is possible to prevent the above-mentioned problems, to dramatically improve the storability of foods, and to make it easier to open the lid from the container even for elderly people.

The gas-barrier adhesive tape referred to in the present invention has a function of sealing the gas-displacement packaged container and preventing gas from entering and exiting the inside and outside of the container (gas barrier property).
An adhesive tape 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. As an example of the case of a bag, the contents and the replacement gas are introduced into the bag through the opening of the bag, the opening of the bag is sealed with the tape, and the outside air and the replacement gas inside the bag are sealed. Cut off.
Further, in the case of a sealed container, the overlapping flange portion of the container and the lid is sealed with the tape. 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, in relation to 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 covering the upper part, from the viewpoint that the display effect of the container can give a feeling of volume of contents. The term "flange portion" as used in the present invention means the edge of the container opening surface, and there is no problem whether the edge has a straight or curved shape. Further, the shape of the container opening of the present invention may be a circle, a triangle, a quadrangle (rectangle, a square), or other polygons, but a rhombus, an ellipse, and an amorphous shape consisting of a curved line,
But there is no problem. Further, the polymerization means that the flange portion of the container overlaps, the sides of the flange portion of the container and the lid are polymerized, sealed by the gas barrier adhesive tape of the present invention, if the inside of the container can be sealed,
The entire side of the flange portion does not necessarily have to overlap.

For example, even in a so-called food pack in which one side of the container and the lid are joined via a hinge part, if the sides of the flange part of the container and the lid are polymerized and sealed with a band tape, the inside of the container can be sealed. There is no. Further, the sealing with the tape means that the tape is adhered to both the container and the lid while straddling them. The resin used for the bag, the container, and the lid refers to 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 Resin (EV
OH and the like), and the thermosetting resin is a urea resin,
Examples thereof include melanin resin, xylene resin, phenol resin, unsaturated polyester resin, and the like, and homopolymer resins 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 tape according to the present invention has a shape that extends long with a width, and an adhesive agent is present on the surface contacting the container and the lid, and the container and the lid are separated by the adhesive agent. As long as the tape can be sealed (sealed) without any problems, the width of the gas-barrier adhesive tape does not matter even if the tape has a constant width, or if there is a thick portion or a thin portion. In addition, if a thin portion (cut or the like) is intentionally formed in the gas barrier adhesive tape, the thin portion has poor mechanical strength, and the difference in strength can be used to provide easy opening. Further, examples of the material of the gas barrier adhesive tape include a single layer or a multi-layered structure composed of paper, a metal thin film, a resin, etc., but from the viewpoint of separate collection, it is more preferable that the resin is the same material as the container. preferable. Further, a metal-free material such as a metal thin film or metal vapor deposition is preferable from the viewpoint of preventing sparks due to collisions of electrons during heating in a microwave oven, and a gas barrier resin is more preferable from the viewpoint of preventing gas dissipation.

The gas barrier adhesive tape of the present invention preferably has a certain strength and elongation from the viewpoint of mechanical suitability when the tape is attached by a machine. J
In the measurement based on the adhesive tape test method of IS-Z-0237, the tensile strength is preferably 10 to 120 N / 10 mm, more preferably 20 to 110 N / 10 m.
m, and more preferably 25 to 95 N / 10 mm. Furthermore, the elongation when a load of 0.1 N is applied per 10 mm length of 10 mm wide adhesive tape is 1 to 50%.
Is more preferable, 2 to 45% is more preferable, and 2 to 40% is still more preferable.

The gas-barrier adhesive tape referred to in the present invention can be broadly classified into a gas-barrier substrate layer and an adhesive layer.
Divided into layers. The gas barrier substrate layer referred to in the present invention is required to have gas barrier properties and has a carbon dioxide gas permeation amount of 1.0 to 4935.0 ml / m ² · da.
y / MPa, oxygen gas permeation amount is 1.0 to 3948.0 m
1 / m ² · day / MPa, nitrogen gas permeation amount is 1.0 to
It preferably has 1480.5 ml / m ² · day / MPa, more preferably a carbon dioxide gas permeation amount of 1
0.0 to 4500.0 ml / m ² · day / MPa, oxygen gas permeation rate 10.0 to 2500.0 ml / m ² · d
ay / MPa, nitrogen gas permeation amount is 10.0 to 1300.
0 ml / m ² · day / MPa, and more preferably a carbon dioxide gas permeation amount of 20.0 to 40.
00.0 ml / m ² · day / MPa, oxygen gas permeation amount is 20.0 to 1300.0 ml / m ² · day / MP
a, Nitrogen gas permeation rate is 20.0 to 1000.0 ml / m
^{It has 2} · day / MPa. Even more preferably, the carbon dioxide gas permeation amount is 20.0 to 1000.
0 ml / m ² · day / MPa, oxygen gas permeability is 2
0.0 to 300.0 ml / m ² · day / MPa, nitrogen gas permeation rate is 20.0 to 250.0 ml / m ² · day
/ MPa.

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 tape
Poor working efficiency of the tape,
From the viewpoint of handling, it is a resin that has a different elasticity, such as
It is necessary to laminate with a polypropylene resin (PP). 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 15 to 100 from the viewpoint of the waist of the adhesive tape.
μm is preferred. In addition, more preferably 20 to 90μ
m, and more preferably 25 to 85 μm.

The resin used in the gas barrier substrate layer used in the adhesive tape 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), polypropylene resin (PP), polybutene-1 resin (PB), poly-4-methylpentene-1 resin and other polyolefin resins (P
O), or ethylene-vinyl acetate copolymer resin (EV
A), ethylene-methyl methacrylate copolymer resins (EMA, etc.), ethylene-vinyl alcohol copolymer resins (EVOH, etc.) and other polyolefin resin modified products (PO modified products), polyethylene terephthalate (including). Modified resins (PET, etc.), polybutylene terephthalate-based (modified) resins (PBT, etc.), and some aromatic components, or polylactic acid-based resins, polyglycolic acid-based resins and other aliphatic compounds Component polyester resin (PEST), polyvinylidene chloride resin (PV
DC), chlorine-based resins such as polyvinyl chloride resin (PVC), α-olefin-carbon monoxide copolymer resin (including hydrogenated resin), α-olefin (ethylene, other) -styrene copolymer resin (including A hydrogenated resin), an ethylene-cyclic hydrocarbon compound copolymer resin (containing hydrogenated resin), a polyamide resin (Ny), a caprolactone resin, and the like. Examples include layers, multilayers of these or layers of resins different from this layer, and stretched or unstretched tapes made of these resins. Among them, polyethylene-based resins (especially HDPE) from the viewpoint of heat resistance and gas barrier properties. , Polypropylene resin (PP), ethylene-vinyl alcohol copolymer resin (EVOH, etc.), polyamide resin (Ny), polyethylene Terephthalate-based (modified) resin (PET, etc.), polybutylene terephthalate-based (modified) resin (PBT, etc.) and other aromatic components, or polylactic acid-based resin, polyglycolic acid-based resin Aliphatic polyester resin (PES)
T) and the like are preferable.

Further, known additives such as antioxidants, light stabilizers, antistatic agents, antifogging agents, colorants, lubricants, etc. may be mixed in or known within a range that does not impair the effects of the present invention. The surface treatment such as corona discharge treatment, flame treatment, radiation treatment including electron / plasma, etc., ion etching treatment, etc., vinylidene chloride, etc. may be subjected to gas barrier coating treatment. As the gas barrier base material layer used in the adhesive tape of the present invention in the present invention, a resin layer having a layered inorganic substance may be provided to form the gas barrier base material 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 tape for sealing gas replacement according to the present invention will be described. First, the term “adhesion” as used in the present invention means that a gas barrier adhesive tape for sealing a gas replacement package is bonded to a bag, a container or a lid. The adhesive strength may be appropriately selected, and the kind of adhesive, the coating amount, etc. may be selected according to the desired adhesive strength. Even if the adhesive has weak adhesive strength, it is a gas barrier adhesive tape and bag for gas displacement packaging encapsulation. And stick containers and lids together,
It only needs to be sealed.

Typical adhesives include solvent type, hot melt type, reactive type, etc., but there is no problem as long as they have adhesiveness, for example, rubber type adhesive, acrylic type adhesive, Examples thereof include vinyl ether adhesives, silicone adhesives, and resin compositions mainly selected 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.

From the viewpoint of less solvent extract and less impurities, acrylic adhesives are even more preferred.
Further, these adhesives contain known additives, such as antioxidants, light stabilizers, antistatic agents, antifogging agents, and colorants, within a range that does not impair the effects of the present invention. Good. Further, in order to intentionally cause partial peeling between the gas barrier base material layer and the adhesive layer of the gas barrier adhesive tape for gas replacement packaging encapsulation of the present invention, silicone or the like having a peeling effect on the gas barrier base material layer is previously prepared. After printing, the adhesive layer is peeled off from the gas barrier substrate layer to form a bag, a container, or an adherend.
It may be provided with so-called tamper-proof printing that remains on the lid.

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 an acrylic acid alkyl ester which is a homopolymer having a low Tg, an acrylic acid ester having a lower alkyl group, an alkyl methacrylic acid 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, etc.

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 standpoint of gas barrier property, especially from the viewpoint of gas displacement 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 tape for gas replacement packaging encapsulation of the present invention may be provided with a cut tape to impart easy opening property. For example, a so-called cut tape in the shape of a string is provided in the center of the width of the gas barrier adhesive tape for sealing gas replacement packaging in parallel with the longitudinal direction of the tape, and the center of the band-shaped tape that seals between the flange portion of the container and the lid. The part is torn with a cut tape in two (the torn upper and lower ends of the band-shaped tape are still attached to the container and the lid), and it is easier to open the container. It is more preferable from the viewpoint of ease of use.

The gas displacement packaging referred to in the present invention will be described. The gas replacement packaging referred to in the present invention means a packaging in which air in a sealed container is replaced with a desired gas, and examples thereof include effects such as appearance improvement relating to storage quality improvement of products and color of products, such as foods. 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 substituting with a gas having a bacteriostatic action such as carbon dioxide.

Any known gas may be used as the above gas. For example, nitrogen, carbon dioxide (carbon dioxide), oxygen, argon and the like,
They 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 replacement method of the gas replacement device includes a chamber type and a gas flush type. The chamber-type gas replacement method is a method in which the entire interior of the chamber is once degassed to a vacuum state and the replacement gas is sent in that state to perform gas replacement,
Generally, the chamber type gas replacement has a feature that the replacement gas has a high replacement rate and can reliably perform gas replacement.

On the other hand, in the gas flush type gas replacement method, the replacement gas is directly flushed into the container containing the contents, and the air in the container is expelled by the replacement gas to replace the gas. It is generally said that the gas flush type has a lower substitution rate than the chamber type, but a desired gas substitution 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 replacement method of the gas replacement device according to the present invention depends on the contents (type and shape) in the container, the packaging speed, the installation space, the gas replacement rate, etc. by the gas replacement method mentioned 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, raw meat, and raw vegetables called three fresh products, side dishes (boiled, grilled, steamed, stir-fried) sold at supermarkets, convenience stores, etc., for example. 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 tape having a width of 25 mm was attached to a stainless steel plate, and the force required for peeling one end of the tape from the test plate toward the other end in a 180 degree direction at a peeling speed of 300 m / min was used.

(2) Functional test for adhesive strength The layer structure of polypropylene resin (PP) and ethylene-vinyl alcohol copolymer resin (EVOH) is PP.
/ EVOH / PP 800μm sheet was used to seal the container as shown in Fig. 4 in a container with a substantially vertical flange (Fig. 3), and a variety of gas replacement packaging gas barrier adhesive tapes were applied. I peeled it off. The adhesive strength at the time of peeling was evaluated in three levels. ◯: It adheres firmly, but it can be peeled off without deforming the container. Δ: Adhesion is present but weak. Alternatively, too much adhesion causes deformation of the container at the time of peeling. X: Insufficient adhesive strength. Or it is too tightly adhered and does not come off.

(3) Oxygen gas permeation amount measurement Measured according to ASTM-D-3985 (measurement temperature 2
3 ° C). (4) Oxygen composition ratio measurement in the 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.

[0034]

Examples 1 to 9 Layer structure consisting of polypropylene resin (PP) and ethylene-vinyl alcohol copolymer resin (EVOH) PP / EVOH / PP 800 μm sheet (oxygen permeability 4.9 ml / m ² · day) / MPa) into a shape shown in FIG. 1 (container), FIG. 2 (lid), and FIG. 3 (figure in which the container is covered with the lid), and a substantially vertical flange portion thereof is used in the gas displacement packaging shown in the examples. It sealed as shown in FIG. 4 using the gas barrier adhesive tape for sealing. Container capacity is 20
It is 0 cm ³ and the inside of this container is filled with high purity nitrogen gas (purity 9
(9.99%) was subjected to gas replacement, and the flange portion of the container was sealed using the gas barrier adhesive tape for gas replacement packaging closure described in Table 1. Then, the oxygen composition ratio in the container was measured immediately after sealing and 30 days after the sealing. A sensory test of adhesive strength was conducted separately from the oxygen composition ratio measurement, and the results are shown in Tables 1 and 2.

[0035]

[Table 1]

[0036]

[Table 2]

[0037]

EFFECTS OF THE INVENTION The present invention is an adhesive tape having a gas barrier property, whereas the adhesive tape of the prior art has a poor gas barrier property and is not suitable for sealing a gas replacement package. Is capable of effectively maintaining the gas replacement effect for a long time, preventing the inflow of oxygen from the outside of the container, preventing the oxidation of the contents, and dramatically improving the preservability of food, Furthermore, it is a sealing method that makes it easy for the elderly to open the lid from the container.

[Brief description of drawings]

FIG. 1 is a perspective view of a lid used in Examples and Comparative Examples.

FIG. 2 is a perspective view of a container used in Examples and Comparative Examples.

FIG. 3 is a perspective view showing a state in which a container and a lid used in Examples and Comparative Examples are stacked.

FIG. 4 is an enlarged cross-sectional view taken along the line AB of FIG.

[Explanation of symbols]

1 lid 2 containers 3 Gas-barrier adhesive tape for sealing gas replacement packaging 4 Flange part

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) C09J 121/00 C09J 121/00 133/00 133/00 F term (reference) 3E053 AA02 BA05 DA02 DA03 DA04 FA10 JA04 3E067 AB01 BA01A EA24 GA19 GD10 3E094 AA02 BA12 CA33 DA02 HA08 4J004 AA04 AA05 AA08 AA10 AA11 AB03 CA03 CA04 CA05 CA06 CA07 CC02 FA06 4J040 CA001 CA011 CA081 CA091 DA01 DD011 DE021 DF041 DF091 DA091 DA011

Claims (6)

[Claims] 1. A gas barrier adhesive tape comprising a gas barrier substrate layer and an adhesive layer. 2. The gas barrier adhesive tape 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 tape according to claim 1 or 2, wherein the adhesive is 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.
The gas barrier adhesive tape according to any one of 1. 5. The cut tape is provided in the longitudinal direction of the gas barrier adhesive tape.
The gas barrier adhesive tape according to any one of 1. 6. The container is made of resin and the contents are housed in the container, the air in the container is replaced with another gas, and the flange portion of the container and the lid is sealed with the gas barrier adhesive tape according to claim 1. A method for producing a gas displacement package, comprising: