JPH072452Y2 - Inner seal material for container mouth sealing - Google Patents

Description

[Detailed Description of the Invention] "Industrial field of application" The present invention is, for example, an inner seal material for sealing the mouth of a container filled with coffee powder, cream powder, taste salt, chemical seasoning and the like. It is about.

"Prior art" For example, at the mouth of a container such as a glass bottle filled with coffee powder or cream powder, an inner seal material for sealing the mouth of the container is attached to protect the filling from moisture. Has been.

The inner seal material comprises a reseal layer and a seal layer having a surface layer made of a releasable resin layer having releasability with respect to the back surface of the reseal layer, the back surface of the reseal layer and the surface of the seal layer. It is formed by a laminated sheet adhered between the caps, and the step of locking the inner seal material on the inner surface of the back surface of the cap and the step of locking the inner seal material on the inner surface of the back surface of the cap while fitting the cap into the mouth of the container The inner sealing material is fixed to the container mouth by the step of adhering the back surface to the container mouth.

As described above, the inner seal material adhered to the container mouth is such that the metal foil such as aluminum present in the seal layer has a moisture-proofing effect on the filler inside the container. By the operation of removing the cap fitted to the portion, separation is made at the interface between the back surface of the reseal layer and the surface of the seal layer, and only the seal layer remains adhered to the container mouth. .

For example, as illustrated in FIGS. 2 to 3, a reseal layer 24 in which a front surface layer 21 made of paperboard and a back surface layer 22 made of a polyolefin resin are laminated via a wax layer 23, and the reseal layer 24. In the case of the inner seal material 27 which is a laminate with a seal layer 26 having a releasable resin layer 25 having a releasability for the back surface layer 22 as a surface layer, the seal layer 26
The glassine paper 28 forming the back surface of the container is bonded to the container mouth 29 with a water-based glue so that the glassine paper 28 is on the side of the inner filler in the container.

The inner seal material 27 adhered to the container mouth 29 is separated at the interface between the back surface of the reseal layer 24 and the surface of the seal layer 26 by the operation of removing the cap 30 fitted to the container mouth 29. Then, the seal layer 26 composed of the peelable resin layer 25, the metal foil 31 such as an aluminum foil, and the glassine paper 28 forming the back surface layer remains in the container opening 29.

The reseal layer 24 is still locked to the back surface of the cap 30, and even after the seal layer 26 is peeled from the container mouth portion 29 when the internal filler is taken out, the reseal layer 24 performs the function of packing in the cap and the inside of the container. Seal the filling inside.

"Problems to be solved by the invention" In a container in which the above-mentioned inner seal material 27 is adhered to the container mouth portion 29, after the cap 30 is removed by the consumer's hand, it is adhered to the container mouth portion 29. The existing seal layer 26 is removed, and the filling material in the container is taken out.

By the way, in the container with the inner seal material 27, since the glassine paper 28 forming the back surface layer of the seal layer 26 is adhered to the container mouth portion 29 with a water-based adhesive, the seal in the inner seal material 27 is reduced. After removing the layer 26, a part of glassine paper remains together with the glue on the upper edge of the container mouth 29, and for example, unsightly which is not suitable for a container for food and drink such as coffee powder or cream powder remains. .

On the other hand, in the inner seal material for sealing the container mouth of the present invention, the adhesion between the inner seal material and the container mouth can be made by thermal bonding by high frequency induction heating. Provided is an inner seal material for sealing the mouth of a container, which does not deteriorate the easy peelability between the reseal layer and the seal layer due to the heat generation of the metal foil due to the high frequency induction heating when bonding the mouth. Is.

Further, in a container using the inner sealing material for sealing the container mouth of the present invention, when the seal layer that remains adhered to the container mouth by opening the container is removed, There is no unsightly appearance that a part of the seal layer remains with the glue, and for example, for sealing the mouth of the container that provides a clean opening edge suitable for a container for food and drink such as coffee powder or cream powder. It provides an inner seal material.

It should be noted that the method of adhering the inner seal material by the high frequency induction heating method is superior to other thermal adhesion methods in that there is no risk of degrading the contents due to local heat generation, and that the finish is quick. It has characteristics.

[Means for Solving the Problem] The inner seal material for sealing the container mouth portion of the first invention is a reseal layer mainly composed of paperboard or a soft synthetic resin layer, and a releasability to the back surface of the reseal layer. And a seal layer having a surface layer made of a peelable resin layer having a peeling resin layer, which is laminated so that the back surface of the reseal layer and the surface of the seal layer are in contact with each other.

In the laminated body, the back surface layer of the seal layer is formed of a heat-adhesive resin layer, and further, in the seal layer, the metal foil and the metal foil are located on the side closer to the reseal layer. The paper layers are laminated.

The inner sealing material for sealing the container mouth portion of the second invention is the same as the inner sealing material for sealing the container mouth portion of the first invention, except that the peelable resin layer forming the surface layer of the sealing layer is a part. It is formed of a print layer.

In the inner seal material for sealing the container mouth portion of the first and second inventions having the above-mentioned configuration, the reseal layer mainly composed of paperboard or soft synthetic resin is engaged with the inner peripheral surface of the back surface of the cap to seal the packing. Those which bring about an action, for example, paper, a polyolefin-based synthetic resin layer, a foamed resin layer,
Furthermore, it is formed by these laminated bodies and the like.

The back surface of the seal layer is adhered to the mouth of the container, and has a moisture-proof effect on the filler inside the container.
A laminated body of a heat-adhesive resin layer forming a back surface layer of the seal layer, a metal foil, a paper laminated on the side closer to the reseal layer with respect to the metal foil, and a synthetic resin film or the like is used. .

In the inner sealing material for sealing the mouth of the container according to the present invention, the back surface layer of the seal layer is formed of a resin having a heat-welding property, and heat generation of the metal foil in the seal layer by high frequency induction heating and the back surface layer. By utilizing the heat-welding ability of the heat-welding resin layer that constitutes the container, the container mouth and the inner seal material are bonded.

In the case where the back layer and the metal foil are adjacent to each other in the seal layer, the heat-adhesive resin layer as the back layer is an acid-modified polyethylene resin having excellent properties in adhesion to the metal foil, for example, A terpolymer resin, ethylene-vinyl acetate copolymer resin, and ethylene, a carboxylic acid monomer such as acrylic acid or methacrylic acid, and ethyl (meth) acrylate, butyl (meth) acrylate, etc. Acid-modified ethylene-based copolymer resin such as ionomer resin, that is, 3 in terms of carboxyl group
It is preferably formed of a heat-adhesive resin whose main component is an acid-modified ethylene-based copolymer resin having about 25 mol% of carboxyl groups.

The back surface layer of the seal layer, from the viewpoint of the stability of the heat-adhesive resin layer itself, and the stability of the bonding portion between the inner sealing material and the container mouth that are bonded by the high frequency induction heating method,
The thickness is preferably about 20-100 μm.

Further, the back surface of the reseal layer mainly composed of paperboard or soft synthetic resin, and the peelable resin layer forming the surface layer of the seal layer are bonded with an adhesive strength such that they can be easily peeled, By rotating the cap normally when removing the cap from the container, the interface between the back surface of the reseal layer and the peelable resin layer that forms the surface layer of the seal layer separates, and the seal layer remains adhered to the mouth of the container. , The reseal layer remains on the inner peripheral surface of the cap while being attached inside the cap.

Since the adhesive strength between the backside layer of the reseal layer and the peelable resin layer that forms the surface layer of the seal layer differs depending on the combination of the resins, the peelable resin layer that forms the surface layer of the seal layer should be entirely solid. It is preferable to adjust the adhesive strength between the backside layer of the reseal layer and the peelable resin layer forming the surface layer of the seal layer by using a resin layer or a resin layer having a partial spot shape. .

The back surface layer of the reseal layer is usually formed of a polyolefin resin such as polyethylene or polypropylene, so that the back surface layer can protect the reseal layer remaining on the inner peripheral surface of the cap. It is preferable that the entire surface be formed of a solid resin layer.

Further, in the peelable resin layer, since the back surface layer in the reseal layer is usually formed of a polyolefin resin, a resin having easy peelability with respect to the polyolefin resin layer, for example, a polyamide resin, Acrylic resin, silicone resin, nitrified cotton, urethane resin, chlorinated rubber resin, vinyl chloride resin, chlorinated polypropylene,
A vinyl chloride-vinyl acetate copolymer resin, a mixed resin thereof, or the like is used.

The paper layer laminated on the side closer to the reseal layer with respect to the metal foil in the seal layer is a process in which the inner seal material for sealing the container mouth of the present invention is thermally bonded to the container mouth by the high frequency induction heating method. The heat generated from the metal foil serves to prevent the inner surface of the resealing layer of the inner sealing material from firmly adhering to the back surface of the sealing layer, and normally has a basis weight of 20 to 200 g / m ^2. Some paper is used.

"Inventive action" The inner sealing material for sealing the container mouth portion of the present invention is a resealing layer mainly composed of paperboard or a soft synthetic resin layer, and a releasable resin layer having releasability from the back surface of the resealing layer. The sealing layer having a surface layer according to 1. is a laminate in which the back surface of the resealing layer and the surface of the sealing layer are in contact with each other, and the back surface layer of the sealing layer is a thermoadhesive resin. It is formed of layers, and the sealing layer has a laminated structure in which a metal foil and a paper layer laminated on the metal foil side closer to the resealing layer are provided.

The inner sealing material for sealing the container mouth portion according to the present invention having the above-mentioned structure is superior to other heat-bonding methods in that there is no risk of degrading the contents due to local heat generation and the finish is quick. It is bonded to the container mouth by thermal bonding by the high frequency induction heating method having the above characteristics.

Therefore, the inner seal material for sealing the container mouth portion of the present invention is attached to the container mouth portion by thermal bonding utilizing the heat generation of the metal foil in the seal layer in the bonding process between the inner seal material and the container mouth portion. Although being adhered, since the paper layer is provided in the seal layer on the reseal layer side with respect to the metal foil, the paper layer exerts a heat insulating action on the adhesive interface between the reseal layer and the seal layer. .

[Examples] Hereinafter, a specific configuration of the inner sealing material for sealing the container mouth portion of the present invention will be described with reference to the drawings.

Example 1 In FIG. 1, after forming a picture print pattern m on the surface of a biaxially stretched polyethylene terephthalate film 2 having a thickness of 12 μ, a releasable resin layer 3 covering the picture print pattern m was formed.
Nitrified cotton that has releasability from the polyethylene resin layer
The mixed resin of polyamide was formed to a thickness of 2 μm.

Next, the back surface of the above-mentioned biaxially stretched polyethylene terephthalate film 2 and the paper 4 having a basis weight of 50 g / m ² are laminated with a melt-extruded resin layer 5 of polyethylene resin having a thickness of 15 μ interposed therebetween, Then, a piece of paper 4 and an aluminum foil with a thickness of 30 μ, which is indicated by reference numeral 6, are provided between the two with a thickness of 15 μm.
It was laminated while interposing the melt-extruded resin layer 7 of μ polyethylene resin.

Further, an ionomer resin film [HM 04c (Tamapoly)] 8 having a thickness of 50 μm was adhered to the surface of the aluminum foil 6 by dry lamination to obtain a seal layer indicated by reference numeral 9.

Subsequently, the surface of the releasable resin layer 3 covering the surface of the above-mentioned biaxially stretched polyethylene terephthalate film 2 and the cardboard 10 having a basis weight of 230 g / m ² and a thickness of 20
By laminating the polyethylene resin melt-extruded resin layer 11 while interposing, a molding material for an inner seal material for sealing a container mouth was obtained.

Subsequently, the molding material is punched into a disk shape with a diameter of 7.51 cm, and the 1 of the present invention indicated by reference numeral 1 in FIG.
An inner seal material for sealing the container mouth was obtained as an example product.

The portion indicated by reference numeral 12 in FIG. 1 is the reseal layer in the inner seal material 1.

The obtained inner seal material 1 is used as the inner seal material 1
10 of the thick paper in contact with the inner peripheral surface of the cap and engage with the back surface of the cap, and after fitting this into the container mouth, the magnetic field [anode voltage: 5KV, anode current: 0.55A, grid The current was 330 mA, the sealing time was 15 seconds, and the inner sealing material 1 was heat-bonded to the mouth of the container by the heat sealing method accompanying the heat generation of the aluminum foil 6 in the sealing layer of the inner sealing material 1.

After cooling, removing the cap from the container,
By the normal operation, the inner seal material 1 becomes the seal layer 9
The peelable resin layer 3 forming the front surface layer and the polyethylene resin layer 11 forming the back surface layer of the reseal layer 12 were easily separated.

That is, the seal layer 9 remained adhered to the container mouth, and the inside of the container was completely sealed. Further, the reseal layer 12 was engaged and held as the packing of the cap on the inner peripheral surface of the cap.

[Advantage of the Invention] The inner sealing material for sealing the container mouth of the present invention comprises a resealing layer mainly composed of paperboard or a soft synthetic resin layer, and a releasable resin layer having releasability to the back surface of the resealing layer. The seal layer having a surface layer is a laminate in which the back surface of the reseal layer and the surface of the seal layer are in contact with each other, and the back surface layer of the seal layer has a thermal adhesive property. The seal layer is formed of a resin layer, and the seal layer includes a metal foil and a paper layer laminated on the metal foil side closer to the reseal layer.

The inner sealing material for sealing the mouth of the container according to the present invention having the above-mentioned structure is formed by the presence of the metal foil in the sealing layer and the heat-welding property of the heat-adhesive resin layer which is the back layer of the sealing layer. Adhesion of the sealing material to the mouth of the container is carried out by using a high-frequency induction heating method, which has no risk of deteriorating the contents due to local heat generation and has a quick finish.

Therefore, when the cap is removed from the container in which the inner seal material is adhered to the container mouth and the seal layer adhered to the container mouth is removed, the peeling of the seal layer is complete, A part of the seal layer does not remain on the upper edge of the portion, and a clean state suitable for a container for food and drink such as coffee powder or cream powder can be obtained, for example.

In addition, since the inner sealing material for sealing the container mouth portion of the present invention has the paper interposed at the position close to the resealing layer with respect to the metal foil existing in the sealing layer, it can be heat-bonded by the high frequency induction heating method. The heat generated by the heat generated by the metal foil when it is adhered to the container mouth does not increase the adhesive strength of the adhesive interface between the reseal layer and the seal layer, that is, between the reseal layer and the seal layer. The inner seal material that is adhered to the container mouth without easily degrading peels easily at the interface between the reseal layer and the seal layer by the rotation of the cap, and Provides a state in which the surface layer of the seal layer is neatly exposed.

[Brief description of drawings]

FIG. 1 is a model cross-sectional view showing an example of an inner seal material for sealing a container mouth portion according to the present invention, and FIG. 2 is a model cross-sectional view of a conventional inner seal material for sealing a container mouth portion, FIG. [Fig. 4] is a model cross-sectional view showing a state in which the cap is removed from the container in which the inner seal material shown in Fig. 2 is adhered to the container opening. 1 ... Inner seal material for sealing container mouth, 3 ... Releasable resin layer, 4 ... Paper layer in seal layer, 6 ... Metal foil in seal layer, 8 ... Back surface layer in seal layer Thermal adhesive resin layer, 9 …… Seal layer, 10 …… Cardboard in reseal layer,
12 …… Reseal layer.

Claims (2)

[Scope of utility model registration request] 1. A reseal layer comprising a paperboard or a soft seal resin layer as a main component, and a seal layer having a surface layer of a releasable resin layer having releasability from the back surface of the reseal layer. In the inner sealing material for sealing the container mouth portion, which is formed by a laminated body in which the back surface of and the surface of the sealing layer are in contact with each other, the back surface layer in the sealing layer is
It is formed of a heat-adhesive resin layer, and further, a metal foil and a paper layer positioned on the side closer to the reseal layer of the metal foil are laminated in the seal layer. Inner seal material for sealing the mouth of a container. 2. The inner seal material for sealing the mouth of a container according to claim 1, wherein the peelable resin layer forming the surface layer of the seal layer is formed of a partially printed layer.