JPH072453Y2 - 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.

The inner seal material adhered to the mouth of the container as described above, the metal foil such as the aluminum foil present in the seal layer has a moisture-proof effect on the filling in the container, By the operation of removing the cap fitted in the mouth portion, the reseal layer is separated at the interface between the back surface and the surface of the seal layer so that only the seal layer remains adhered to the mouth portion of the container. There is.

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 is In the case of the inner seal material 27, which is a laminate with the seal layer 26 having the releasable resin layer 25 having the releasability for the back surface layer 22 as the surface layer, it forms the back surface layer of the seal layer 26. The glassine paper 28 is adhered to the container mouth 29 with a water-based adhesive 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 including 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, and the reseal layer 24 is locked on the back surface of the cap 30. As it is, even after the seal layer 26 is peeled off from the container mouth portion 29 when the inner filler is taken out, it still functions as a packing of the cap and seals the inner filler inside the container.

"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, since the glassine paper 28 forming the back surface layer of the seal layer 26 is adhered to the container mouth portion 29 with an aqueous glue, the seal layer 26 in the inner seal material is After removing the container
On the upper edge of 29, a part of glassine paper remains together with the paste, and it is unsightly that is not suitable for a container for food and drink such as coffee powder or cream powder.

On the other hand, in the inner seal material of the present invention, the adhesion between the inner seal material and the container mouth part can be made by thermal adhesion by high frequency induction heating, and the seal layer adhered to the container mouth part After removing, there is no unsightly appearance that part of the sealing layer remains with the glue on the upper edge of the container mouth, for example, a clean state suitable for containers for food and drink such as coffee powder and cream powder. The present invention provides an inner seal material for sealing the mouth of a container, in which the opening edge of the above can be obtained.

Further, since the inner seal material of the present invention uses the hot-melt type adhesive layer to bond the main paperboard in the reseal layer of the inner seal material, curling of the inner seal material is prevented. The present invention is to provide an inner seal material for sealing a container mouth portion having a laminated structure suitable for high-mix low-volume production because it is good and has a simple equipment for the adhesion process and an easy adhesion operation.

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 sealing material for sealing the container mouth portion of the first invention is formed by bonding a paperboard to a sheet laminated on the back surface of the paperboard with a hot-melt adhesive layer. And a resealing layer mainly composed of the paperboard, and a backside layer composed of a heat-adhesive resin layer and a surface layer formed of a releasable resin having releasability to the backside of the resealing layer. The sealing layer is made of a laminated material in which the back surface of the resealing layer and the front surface of the sealing layer are in contact with each other.

In the resealing layer mainly composed of a paperboard of the inner sealing material for sealing the container mouth portion, the paperboard and the sheet laminated on the back surface of the paperboard have an adhesive force due to the hot-melt type adhesive layer located between them. In addition, in the reseal layer, a paper layer is laminated on the back side of the paperboard on the side closer to the seal layer with respect to the hot melt adhesive layer, and a metal foil is included in the seal layer. It is 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 printing layer.

In the inner seal material for sealing the container mouth portion according to the first and second inventions having the above-described configuration, the reseal layer mainly composed of the paperboard is engaged with the inner surface of the back surface of the cap, and the action of packing the cap is performed. A hot melt adhesive layer on the back side of the paperboard and the paperboard, and a paper layer located on the seal layer side with respect to the hot melt adhesive layer,
Further, a laminate with a polyolefin synthetic resin layer or the like is used.

In addition, the back surface of the sealing layer is adhered to the mouth of the container,
A releasable resin that retains moisture resistance against the filling in the container and that has releasability with respect to the back surface of the resealing layer, the thermal adhesive resin layer that forms the back surface layer of the sealing layer, the metal foil, and the resealing layer. A laminate with layers etc. is utilized.

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.

When the back surface layer of the seal layer and the metal foil are adjacent to each other, the heat-adhesive resin layer as the back surface layer is an acid-modified polyethylene resin having excellent adhesiveness to the metal foil, for example, ethylene. And a carboxylic acid-based monomer such as acrylic acid or methacrylic acid and ethyl (meth) acrylate, butyl (meth) acrylate, etc.
Original copolymer resin, ethylene-vinyl acetate copolymer resin, and further acid-modified ethylene copolymer resin such as ionomer resin, 3 to 25 mol% 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 a certain degree of carboxyl group.

The back layer of the seal layer is thick in terms of the stability of the heat-adhesive resin layer itself and the stability of the heat-bonded portion between the inner seal material and the container mouth, which are bonded by the high frequency induction heating method. It is preferable that the thickness is about 20 to 100 μm.

In addition, the back surface of the reseal layer mainly composed of paperboard and the releasable resin layer forming the surface layer of the seal layer are bonded with an adhesive strength such that they can be easily peeled off, and the cap is removed from the container. By turning the cap normally when removing it,
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, the seal layer remains adhered to the container mouth, and the inner circumference of the cap remains attached to the reseal layer inside the cap. Remain on the surface.

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, for example, 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, the back surface layer in the reseal layer is, as described above, usually formed of a polyolefin resin, and therefore, a resin having an easy peeling property with respect to the polyolefin resin layer, for example, , Polyamide resin, acrylic resin, silicone resin, nitrification cotton, urethane resin, chlorinated rubber resin, vinyl chloride resin, chlorinated polypropylene, vinyl chloride-vinyl acetate copolymer resin, and mixed resin of these. Used.

The paper layer laminated on the back side of the paperboard, which is the main component of the reseal layer, with respect to the hot melt adhesive layer, is the inner seal material for sealing the container mouth of the present invention by the high frequency induction heating method. Due to the heat generated by the metal foil in the sealing layer during the process of heat-bonding to the mouth, the hot-melt adhesive layer on the back surface of the paperboard melts and has a heat insulation function to prevent it from penetrating into the paperboard. This is achieved, and paper having a basis weight of 20 to 200 g / m ² is usually used.

A low-density polyethylene or a cotton-like low-density polyethylene resin is mainly used for the hot-melt adhesive layer for adhering the back surface of the paper board which is the main body of the reseal layer and the sheet laminated on the back surface of the paper board. It

[Advantage of the Invention] The inner sealing material for sealing the mouth of the container of the present invention has a resealing layer composed mainly of paperboard and a surface layer made of a releasable resin having a releasability with respect to the back surface of the resealing layer and thermal adhesiveness. A seal layer having a back surface layer made of a resin layer is made of a laminated material laminated such that the back surface of the reseal layer and the front surface of the seal layer are in contact with each other. The eggplant paperboard is adhered to the sheet laminated on the back surface of the paperboard by a hot-melt adhesive layer, and the resealing layer seals the hotmelt adhesive layer on the back surface of the paperboard. A paper layer is laminated on the side closer to the layers, and a metal foil is further laminated in the seal layer.

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, 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 is adhered to the container mouth by high frequency induction heating utilizing the heat generation of the metal foil in the seal layer. However, the heat generated in the metal foil at this time is due to the heat insulation effect of the paper layer laminated on the side closer to the seal layer with respect to the hot melt type adhesive layer on the back surface of the paperboard. The initial predetermined lamination strength is maintained between the paperboard and the sheet laminated on the back surface of the paperboard without reaching the hot-melt adhesive 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 30 μm-thick aluminum foil 2 and 50 μm-thick ionomer resin film [HM04c (Tamapoly)] 3 were bonded by dry lamination, a pattern printing pattern m was printed on the surface of the aluminum foil 2. Further, the peelable resin layer 4 having a thickness of 2 μm, which covers the pattern printed pattern m, is formed of a mixed resin of nitrified cotton / polyamide resin having releasability with respect to the polyethylene resin layer, and a reference numeral 5 A seal layer represented by was obtained.

Furthermore, the polyethylene resin layer 7 surface of a laminated sheet in which polyethylene resin layers 7 and 8 having a thickness of 20 μ are laminated on both upper and lower surfaces of a high-quality paper 6 having a basis weight of 52.3 g / m ² and the above-mentioned sealing layer 5 The polyethylene resin layer 8 having a thickness of 20 μ is laminated between the peelable resin layer 4 surface and the peelable resin layer 4 surface, and the polyethylene resin layer 8 surface and the basis weight of the obtained laminate are measured. An amount of 230 g / m ² of paperboard 10 was pasted together with a hot-melt type adhesive layer 11 made of a low-density polyethylene resin interposed therebetween to obtain a material for forming an inner sealing material for sealing the mouth of a container. It was

Subsequently, the molding material is punched into a disk shape having a diameter of 7.51 cm to form an inner sealing material for sealing the mouth of the container, which is one embodiment of the present invention and is indicated by reference numeral 1 in FIG. Got

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
The 10 side of the paperboard in is in contact with the inner surface side of the cap and engages with the back side of the cap, and after fitting this into the container mouth, the magnetic field [anode voltage: 5KV, anode current: 0.55A, grid Current of 330 mA, sealing time: 15 seconds], and the inner seal material 1 was heat-bonded to the container opening by the heat sealing method accompanying the heat generation of the aluminum foil 2 in the seal layer 5 of the inner seal material 1. .

After cooling, removing the cap from the container,
By the normal operation, the inner seal material 1 becomes the seal layer 5
The peelable resin layer 4 forming the front surface layer and the polyethylene resin layer 9 forming the back surface layer of the reseal layer 10 were easily separated.

That is, the seal layer 5 remained fixedly attached to the container mouth, and the inside of the container was completely sealed. Further, the reseal layer 10 was engaged and held on the inner peripheral surface of the cap as a packing of the cap.

In addition, on the surface of the seal layer 5 which remained fixed to the mouth portion of the container, the brilliance of the metal due to the aluminum foil 2 in the seal layer 5 was beautifully exposed.

[Advantage of the Invention] The inner sealing material for sealing the mouth of the container of the present invention is heat-bonded to the resealing layer mainly composed of paperboard and the surface layer of the releasable resin layer having releasability to the back surface of the resealing layer. A sealing layer having a back surface layer made of a flexible resin layer, and a backing layer of the resealing layer and a front surface of the sealing layer are laminated so as to be in contact with each other. It is adhered to the sheet laminated on the back surface by a hot-melt type adhesive layer, and
In the reseal layer, a paper layer is laminated on the back surface of the paperboard on the side closer to the seal layer with respect to the hot melt adhesive layer, and the seal layer is provided with a metal foil.

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.

The inner sealing material for sealing the container mouth portion of the present invention is located at a position close to the seal layer with respect to the hot-melt adhesive layer that bonds the main paperboard in the reseal layer and the sheet on the back surface of the paperboard. Since the paper layers are laminated, the heat generated in the metal foil when the inner seal material is adhered to the container mouth by the high frequency induction heating method does not affect the above-mentioned hot melt adhesive layer. , That is, the heat generated by the metal foil when the inner seal material is adhered to the container mouth portion by thermal adhesion by the high frequency induction heating method, the hot-melt adhesive layer on the back surface of the paperboard is melted and penetrates into the paperboard, The inner seal material adhered to the container mouth does not decrease the adhesive force between the paperboard and the sheet on the back side of the paperboard, and the cap is rotated to reseal and seal the inner seal material. It was easily peeled with a predetermined interface between, on the container opening, a state in which the surface layer of the sealing layer is cleanly exposed is formed.

[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. 6 is a model cross-sectional view showing a state in which the cap is removed from the container in which the inner seal material of FIG. 1 ... Inner seal material for sealing container mouth, 2 ... Metal foil in seal layer, 3 ... Thermoadhesive resin layer forming back surface layer of seal layer, 4 ... Peelable resin layer (surface of seal layer Layers), 5 ... seal layer, 6 ... paper layer, 10 ... paperboard which is the main component of the reseal layer, 11 ... hot melt adhesive layer, 12 ... reseal layer.

Claims (2)

[Scope of utility model registration request] 1. A main board of a resealing layer is adhered to a sheet laminated on the back surface of the paperboard by a hot-melt type adhesive layer, and is separated from the back surface of the resealing layer. A seal layer having a surface layer formed of a releasable resin having moldability and a back surface layer formed of a heat-adhesive resin layer, the reseal layer, and the back surface of the reseal layer and the surface of the seal layer. In the inner sealing material for sealing the container mouth portion made of laminated materials laminated so as to be in contact with each other, in the reseal layer, a paper layer is provided on the side closer to the seal layer than the hot melt adhesive layer on the back surface of the paperboard. An inner seal material for sealing a container mouth, wherein the inner seal material is laminated, and a metal foil is laminated in the seal layer. 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.