JP2010260565A - Inner seal material for sealing the mouth and a sealed container using the inner seal material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inner sealing material for sealing a mouth part capable of forming stably an opened taking-out opening even when there exists a constitution so that a sealing material has such a material that is hardly separated and removed. <P>SOLUTION: In the inner sealing material for sealing the mouth part in which a sealing material having at least a sealing layer, a water content absorbing functional layer, a moisture-proof material layer, a second releasing layer, adhesive layer and a substrate layer, and a resealing material having at least an elastic sheet layer are laminated through a first releasing layer, a notch for opening which reaches the sealing layer, the water content absorbing functional layer and the moisture-proof material layer is provided from the sealing layer side of the sealing material, to make the first releasing layer more easily releasable than the second releasing layer. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

The present invention relates to an inner seal material for sealing a container mouth and a container mouth sealed container using the inner seal. More specifically, the present invention relates to a container for food, medicine, cosmetics, etc., in particular, an inner seal material that is suitably used as a lid for a plastic container, and a sealed container that is hermetically sealed with the inner seal material.

In containers that contain instant coffee, creaming powder, dashi stock, health food, sprinkles, powdered cosmetics, toner and other foods, medicines, cosmetics, etc. In order to prevent deterioration due to contact with air or moisture, the container mouth is sealed with an inner seal material.

Such an inner seal material is generally formed by laminating a relatively thick reseal material mainly composed of paperboard and the like and a relatively thin seal material obtained by laminating a metal foil such as an aluminum foil and glassine paper so that a release layer can be formed. Laminated body.

When the cap is removed, the reseal material and the seal material are delaminated at the interface between them or in the release layer interposed between them, and the reseal material remains inside the cap, and the seal material is the container mouth. The container mouth is sealed as a lid material that remains in the state of being attached to the container.

Prior to use, some or all of the lid material (seal material) is peeled off and removed by the user, but even after the lid material is removed, the reseal material remains inside the cap. By mounting, the reseal material closes the container mouth and can exhibit a certain quality-preventing effect.

Moreover, as a desiccant loaded inside the cap, a case where an inorganic compound having a drying function is made together with various inorganic binders to form a tablet-like molded body can be seen. However, these molded bodies are often destroyed by a slight stress or vibration, and in the worst case, there is a possibility that a problem of foreign matter mixing into the contents may occur.

In order to avoid the problem, a type in which this tablet-like molded product is wrapped with thin paper has been seen, but in this case, the thin paper that wraps the tablet-like desiccant removes moisture in the container. It has become regarded as a problem to have an adverse effect on doing so.
In order to solve the above problems, a desiccant layer formed by laminating a resin kneaded with a desiccant has the same diameter as the diameter of the mouth of the container, and is disposed on the lower surface of the sealing material. An inner seal material having a combination is disclosed (see Patent Document 1).

In addition, an opening line for opening is provided in advance in the sealing material, and the sealing material is separated from the opening line by rotating the cap, and the separating portion is separated together with the lily sealing material. It has been proposed to form an opening for taking out the contents (see Patent Document 2).
As described above, in order to form the opening simultaneously with the rotation of the cap, it is preferable that the thickness of the sealing material is reduced, and the sealing material is made of a material that can be cut as easily as possible.
However, for example, when a multi-layer structure is provided in which a resin in which a desiccant is kneaded is provided in a sealing material, there is a risk that opening may be difficult.
In addition, as the moisture-proof material layer, for example, there is a configuration using an inorganic oxide vapor-deposited film, but since a plastic film is used as described above, even if a cut is formed, it can be opened only by rotating the cap. Was difficult.

JP 2002-186657 A Japanese Utility Model Publication No. 61-166944

The present invention improves the above-mentioned problems, and even if the sealing material has a material that is difficult to separate and remove, an inner seal for sealing a mouth that can stably form an extraction port that is open The purpose is to provide materials.
It is another object of the present invention to provide a sealed container using the inner seal material and sealing the mouth of the container body.

The invention according to claim 1 includes a sealing material having at least a sealing layer, a moisture absorption functional layer, a moisture-proof material layer, a second release layer, an adhesive layer and a base material layer, and a resealing material having at least an elastic sheet layer. 1 is an inner sealing material for sealing a mouth laminated through a release layer, the opening of the sealing material reaching the moisture absorption functional layer and the moisture-proof material layer from the sealing layer side. An inner seal material for sealing a mouth, wherein one release layer is easier to peel than the second release layer.

According to the second aspect of the present invention, a sealing material having at least a sealing layer, a moisture-proof material layer, a second peeling layer, an adhesive layer and a base material layer, and a resealing material having at least an elastic sheet layer are interposed via the first peeling layer. An inner sealing material for sealing a mouth portion, wherein an opening cut reaching the moisture-proof material layer from the sealing layer side of the sealing material is provided, and the first release layer is peeled off from the second release layer It is an inner seal material for sealing the mouth characterized by being easy to

According to a third aspect of the present invention, there is provided an inner seal material for sealing a mouth, wherein a moisture absorption function layer is provided on the reseal material.

According to a fourth aspect of the present invention, there is provided an inner seal material for sealing a mouth, wherein the moisture-proof material layer includes a plastic material.

According to a fifth aspect of the present invention, there is provided an inner seal material for sealing a container mouth, wherein the moisture absorption function layer provided in the seal layer and the reseal layer has a moisture absorption function of different moisture absorption types.

The invention according to claim 6 is an inner seal material for sealing a container mouth, wherein one of the moisture absorption functional layers is a humidity control type.

The invention according to claim 7 is an inner seal material for sealing a container mouth, wherein one of the moisture absorption functional layers is an absolutely dry type.

The invention according to claim 8 is an inner seal material for sealing a container mouth, wherein the moisture-proof material layer includes an aluminum foil.

The invention according to claim 9 is a sealed container characterized in that the mouth of the container body is sealed by the inner seal material for sealing a container mouth described in any one of the above.

The invention according to claim 10 is the sealed container characterized in that the container body is a plastic container.

Since the inner seal material for sealing the container mouth portion of the present invention peels the reseal material from the seal material, it is possible to confirm the opening of the cap, and when the first release layer is opened, the separating portion of the seal material is At the same time, it is difficult to open the sealing material because the separation part is removed when the base material is removed from the sealing material and then from the second peeling layer. Even if the material is contained, the opening can be stably performed.

In addition, since the sealing material is provided with a moisture absorption function layer, the contents remain in the container body from the start of storage until the start of use, and the moisture remaining in the container body enters from the side wall of the container body. Moisture can be reliably absorbed, and the preservation atmosphere can be kept constant.
Therefore, it is possible to provide a sealed container that does not cause quality deterioration of contents due to moisture.

When the moisture absorption recording functional layer is of a humidity control type, the humidity in the container body can be maintained within a certain range, and an atmosphere that matches the contents can be maintained.
By making the moisture absorption recording functional layer an absolutely dry type, the humidity in the container body can be made as small as possible, and a constant dry state can be maintained.

  In addition, a stable opening can be formed even when the moisture-proof material layer in the seal portion uses a vapor deposition film having a vapor deposition layer of aluminum, metal oxide or the like on the plastic film.

It is sectional drawing which shows one Example of the inner seal material of this invention. It is sectional drawing which shows the other example of the inner seal material of this invention. It is sectional drawing which shows the other example of the inner seal material of this invention. It is a cross-sectional explanatory drawing which shows the state which loaded the inner seal material in the cap and sealed the opening part of the container main body. FIG. 5 is an explanatory cross-sectional view showing a state where the cap of the container shown in FIG. 4 is opened.

As shown in FIG. 1, the inner seal material 1 for sealing a container mouth of the present invention has a seal layer 101, a moisture absorption functional layer 102, a moisture-proof material layer 103, a second release layer 104, and an adhesive layer 106 from the lower surface side. The laminated sealing material 2 having the base material layer 107 and the resealing material 3 having the first release layer 201 and the elastic sheet layer 205 are laminated via the adhesive layer 300.
The sealing material 2 has a notch 303 reaching the moisture absorption functional layer 102 and the moisture-proof material layer 103 from the seal layer 101 side, and a separation part 304 surrounded by the notch 303, and the separation part 304 It is laminated | stacked with the contact bonding layer 108 via the 2nd peeling layer 104 which has releasability with respect to the upper surface of the sealing material except an upper surface, or the lower surface of a base material.
Further, the base material 107 of the sealing material 2 is an inner sealing material for sealing a mouth, which is laminated on the lower surface of the resealing material 3 with an adhesive layer 300 via a first peeling layer 209.
Here, the peel strength of the second release layer 104 is greater than the peel strength of the first release layer 209.

FIG. 2 shows a laminated sealing material 2 having a sealing layer 101, a moisture-proof material layer 103, a second release layer 104, an adhesive layer 106, and a base material layer 107, a moisture absorbing function layer 202, and an elastic sheet from the lower surface side. The sealing material 3 on which the layer 205 is laminated is laminated with the adhesive layer 300 via the first peeling layer 201.
The sealing material 2 has a notch 303 reaching the moisture-proof material layer 103 from the seal layer 101 side, a separation part 304 surrounded by the notch 303, and the second release layer 104 is composed of the separation part 304 is configured to be provided on the lower surface of the base material 107 excluding the upper surface. Here, the peel strength of the second release layer 104 is greater than the peel strength of the first release layer 201.

FIG. 3 is a cross-sectional view showing another inner seal material 1.
Specifically, the reseal material 3 having the configuration shown in FIG. 1 is an inner seal material for sealing a mouth in which a moisture absorption functional layer 202, a moisture-proof material layer 203, and an elastic sheet layer 205 are laminated.

Then, as shown in FIG. 4, the inner seal material 1 shown in FIG. 3 is loaded into the cap 5 with the reseal material 3 side as the cap side and capped with the container body 4, and then the mouth of the container body 2. In addition, the inner seal material is in close contact, and the mouth of the container body 4 is sealed.

In FIG. 5, by rotating the cap 5 of the sealed container in the state shown in FIG. 4, the first release layer 209 and the adhesive layer 300 are peeled from the interface, and the sealing material 2 and the resealing material 3 are separated.
When the base material 107 of the sealing material 2 is peeled off, the separation part 304 surrounded by the notch 303 of the sealing material 2 separates together with the base material 107, thereby taking out the contents to the sealing material 2. For this purpose, an opening 309 can be formed.

Among the configurations of the inner seal material 1, the moisture absorption functional layers 102 and 202 may include a configuration in which protective layers are provided on both sides of a resin layer containing an inorganic compound having hygroscopic performance.
The inorganic compound used for the resin layer containing the inorganic compound having moisture absorption performance used for the moisture absorption functional layers 102 and 202 is an absolutely dry type in which the humidity in the bottle is kept dry (relative humidity of 10% or less), or The components differ depending on the humidity control type in which the environment is adjusted to a constant humidity (relative humidity 20 to 70%).

In the former case, a desiccant that does not absorb or desorb moisture adsorbed by the desiccant or is difficult to absorb or desorb is used.
Examples of the desiccant include calcium oxide, zeolite, and silica gel.

In the latter case, a desiccant that can absorb and desorb moisture is preferable in order to keep the moisture (vapor pressure) in the packaging container and the moisture (vapor pressure) absorbed by the desiccant.
The desiccant is preferably selected from at least one of sulfate compounds such as magnesium sulfate and baked baked alum, activated alumina, activated carbon, and clay mineral.

By blending a desiccant composed of an inorganic compound having hygroscopic performance into various thermoplastic resins, the moisture absorbing layer 302 using a resin having moisture absorbing ability can be obtained.
Examples of the thermoplastic resin blended with the desiccant include α-olefins (butene-1, hexene-1, octene-1, etc.) using a multisite catalyst such as low density polyethylene, medium density polyethylene, high density polyethylene, and Ziegler-Natta catalyst. 4-methylpentene-1, etc.)-Alpha olefin copolymers such as polypropylene, polybutene-1, polyalphaolefins such as poly-4-methylpentene-1, random polypropylene, block polypropylene, etc. Coalescence can be used.
Resins obtained by copolymerization of two or more α-olefins such as ethylene-propylene-butene copolymer, butene-propylene copolymer, and propylene-butene-hexene copolymer can also be used.
A polyolefin resin such as an ethylene-cyclic olefin copolymer can also be used.
Further, esterified products of ethylene-α, β-unsaturated carboxylic acid, especially ethylene-methyl (meth) acrylate, ethylene-ethyl (meth) acrylate, ethylene- (meth) acrylate n-butyl, ethylene- (meth) I-butyl acrylate, t-butyl ethylene- (meth) acrylate, and the like can also be used.

Next, as a method for producing a resin layer in which an inorganic compound having hygroscopic performance is blended, a material prepared by adjusting the inorganic compound having hygroscopic performance according to the purpose to 1 to 50 wt% and thermoplastic resin to 50 to 99 wt% Are dry blended using a ribbon mixer, a tumbler mixer, a Henschel mixer or the like.
Next, using a kneader such as a single screw extruder or twin screw extruder or a Banbury, for example, kneading at a melting point of 280 ° C. or less, preferably 260 ° C. or less, more preferably 240 ° C. or less. It is obtained by.
In that case, you may surface-treat various functional phases with dispersing agents, such as an olefin type wax, as needed. The obtained strand is cooled by air cooling or water cooling, and after pelletizing, it is stored in a packaging form such as an aluminum bag.
And it can manufacture by film-forming by a T-die method, an inflation method, etc.

However, a resin layer alone containing an inorganic compound having hygroscopic performance is likely to be quickly absorbed and saturated when a packaging material is produced. Therefore, it is composed of a thermoplastic resin layer on at least one side, preferably on both sides. It is preferable to provide a protective layer.
The material of the protective layer is preferably selected from various thermoplastic resins that contain the above-described inorganic compound having hygroscopic performance.
In this case, it is possible to form a film by a technique such as a T-die method or an inflation method by co-extrusion of a resin layer and a protective layer containing an inorganic compound having hygroscopic performance.

Examples of the moisture-proof material layer 103 include an aluminum foil, a metal vapor-deposited film, and an inorganic oxide vapor-deposited film, and an aluminum foil having a thickness of 5 to 30 μm is most preferable from the viewpoint of moisture-proof and the thickness to be used.
The moisture-proof material layer 103 can be laminated on the opposite side of the moisture absorption functional layer 104 from the container body to prevent moisture from being transmitted from the outside.

The base material layer 107 may be a paper base material such as single-side coated paper or glassine paper, or a plastic base material such as polyethylene terephthalate (PET) or stretched polypropylene (OPP).
Further, the base material layer 107 may be used as the moisture-proof material layer by using a material having excellent moisture resistance or a composite material.
Specifically, a composite material in which an aluminum foil is laminated on a plastic substrate such as polyethylene terephthalate (PET) or expanded polypropylene (OPP), or a material used for the moisture-proof material layer may be used as the substrate layer.

The first release layer 209 and the second release layer 104 have a lower adhesion strength than the adhesion between other layers, and the second release layer 104 has a higher peel strength than the first release layer. The selection should be as follows.
Materials used for the release layer include, for example, polyolefins such as polyethylene and polypropylene, chlorinated rubber, nitrulose cellulose, polyamide, chlorinated polyolefin, urethane, acrylic cellulose, ethylene vinyl alcohol, vinyl acetate, vinyl acetate, chlorinated polyolefin, chlorine A resin selected from at least one resin such as fluorinated polypropylene, cellulose acetate, maleic acid, melamine, and alkyd, or a resin containing wax or wax can be used.

The sealing layer and the adhesive layers 105 and 300 are not coated on the entire surface but are made of dots (points) in order to maintain the interlayer strength when the inner sealing material is formed and to be peeled off by the turning force when the cap is opened. Or a pattern such as a dotted line.
The sealing layer and the adhesive layer include, for example, polyolefins such as polyethylene and polypropylene, chlorinated rubber, nitrulose cellulose, polyamide, chlorinated polyolefin, urethane, acrylic cellulose, ethylene vinyl alcohol, vinyl acetate, vinyl acetate, and chlorinated polyolefin. , At least one resin such as chlorinated polypropylene, cellulose acetate, maleic acid, melamine, and alkyd. A hot melt obtained by mixing a resin such as ethylene vinyl alcohol or ethylene acrylate with a wax such as paraffin or a tackifier such as rosin can also be used.

The release layer may be an easy-peeling polyolefin layer having a polymer alloy layer mixed with at least a polyolefin-based elastomer instead of the release varnish.

The elastic sheet layer 205 has a sealing function as a packing function, and specifically, an eight-way sheet such as a paperboard, a foamed polyethylene sheet, and a foamed polypropylene sheet, or a combination thereof can be used. At this time, the elastic sheet layer preferably has a thickness of 100 μm to 2000 μm.

DESCRIPTION OF SYMBOLS 1 ... Inner seal material 2 ... Seal material 3 ... Reseal material 4 ... Container main body 5 ... Cap 101 ... Seal layer 102, 202 ... Moisture absorption functional layer 103, 203- .... Moisture-proof material layer 104 ... second release layer 107 ... base material 106, 108, 300 ... adhesive layer 205 ... elastic sheet layer 209 ... first release layer 303 ... cut 304 ... separation part

Claims (10)

A sealing material having at least a sealing layer, a moisture absorption functional layer, a moisture-proof material layer, a second peeling layer, an adhesive layer and a base material layer, and a resealing material having at least an elastic sheet layer were laminated via the first peeling layer. An inner seal material for sealing a mouth portion, wherein an opening cut reaching the moisture absorption functional layer and the moisture-proof material layer from the seal layer side of the seal material is provided, and the first release layer is the second release layer An inner seal material for sealing a mouth, which is more easily peeled off. A sealing material having at least a sealing layer, a moisture-proof material layer, a second peeling layer, an adhesive layer and a base material layer, and a resealing material having at least a moisture absorption functional layer and an elastic sheet layer were laminated via the first peeling layer. It is an inner seal material for sealing a mouth, and an opening cut reaching the moisture-proof material layer from the seal layer side of the seal material is provided, and the first release layer is more easily peeled off than the second release layer. An inner sealant for sealing the mouth, characterized by The inner seal material for sealing a mouth according to claim 1 or 2, further comprising a moisture absorption function layer provided on the reseal material. The inner sealant for sealing a container mouth according to claim 1 or 2, wherein the moisture-proof material layer includes an aluminum foil. The mouth seal inner seal material according to any one of claims 1 to 3, wherein the moisture-proof material layer includes a plastic material. The inner sealing material for sealing a container mouth according to any one of claims 3 to 5, wherein the moisture absorption function layers provided in the seal layer and the reseal layer have moisture absorption functions of different moisture absorption types. 7. The inner sealing material for sealing a container mouth according to claim 1, wherein one of the moisture absorption functional layers is a humidity control type. 7. The inner sealing material for sealing a container mouth according to claim 1, wherein one of the moisture absorption functional layers is an absolutely dry type. A sealed container, wherein the mouth of the container body is sealed with the container seal for sealing the mouth of the container according to any one of claims 1 to 8. The sealed container according to claim 9, wherein the container body is a plastic container.

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