JPS6132759Y2 - - Google Patents

Description

[Detailed description of the invention] This invention has excellent sealing properties, moisture-proofing properties, releasability, etc., and when the reseal layer is removed along with the cap, the container opening is sealed only with the sealing layer. An object of the present invention is to provide an inner sealing material for sealing the mouth of a container with a novel structure that allows the contents inside the container to be visually recognized through the sealing layer.

Generally, an inner sealing material is attached to the mouth of a container filled with instant coffee powder, food cream powder, etc. for the purpose of protecting the contents from moisture. A conventional inner sealing material of this kind, as illustrated by reference numeral 1 in FIG. 1, consists of a paperboard 2 and an aluminum foil on which a glassine paper 4 is laminated via an extrusion coat layer 3 of polyolefin resin on the back side. etc. metal foil 5
A multilayer laminated sheet is used in which the caps are adhered using a wax adhesive layer 6, and when the cap is removed from the container, the wax adhesive in the multilayer laminated sheet is removed as shown in FIG. The layer 6 is torn off in the middle, and the reseal layer 8, which is mainly made of paperboard 2, remains inside the cap 7, and the other seal layer 9, which is mainly made of metal foil 5, remains on the container opening 10, leaving the inside of the container It functions to protect the internal filling material from moisture.

In FIGS. 1 and 2, the part indicated by the reference numeral 11 is the printing anchor coat layer provided on the surface of the metal foil 5, and the part indicated by the reference numeral 12 is the anchor coat layer 11. This is the printed pattern part printed on the surface.

Conventional inner seal material 1 having the above-mentioned configuration
When a customer removes the cap of a container loaded with the same at a store, a sealing layer 9 mainly made of metal foil 5 remains on the container opening 10.
For containers to be filled with items in which the contents inside the container cannot be visually recognized and the customer must be able to see the contents by simply removing the container cap, such as containers for cosmetic creams, etc. I couldn't use it.

Furthermore, when using a container loaded with the conventional inner seal material 1 having the above-mentioned structure, the cap is removed by the consumer's hands, and then the seal is sealed from the container opening 10. Since the layer 9 is removed, when the cap 7 is reattached to the container opening 10, only the reseal layer 8, which is mainly made of paperboard 2, will remain on the container opening 10, and the moisture-proofing function thereafter will not be sufficient. It also had drawbacks.

Furthermore, in the inner sealing material 1 having the above structure, when the inner sealing material 1 having the above structure is applied to a container having a one-touch type cap, the sealing layer that should remain on the inner surface of the cap and the sealing layer that should remain on the mouth of the container. The peel strength between the inner seal material 1 and
There was a drawback that the adhesive layer 6 did not peel off, and the reseal layer 8 remained integrated with the seal layer 9 at the mouth of the container. In particular, in order to eliminate this drawback, if the peeling strength of the adhesive layer 6 made of wax is made weaker and the peelability of this layer is increased, the resealing layer and sealing material can be bonded together before applying the inner sealing material to the container opening. Some peeling may occur between the layers,
Furthermore, there have been other problems such as separation of both layers and wrinkles.

The present invention does not have the above-mentioned drawbacks by configuring the scope of the utility model registration claims.
It has excellent properties such as moisture resistance, sealability, and removability.
Moreover, the reseal layer is removed along with the cap,
It is possible to provide an inner sealing material for sealing the mouth of a container, which allows the contents inside the container to be visually recognized through the sealing layer when the mouth of the container is sealed only with the sealing layer.

Hereinafter, the structure of the inner sealing material for sealing the mouth of a container according to the present invention will be explained based on the drawings.

FIG. 3 is a partial cross-sectional view showing an example of the inner seal material for sealing the container mouth of the present invention. 32 and the paper layer 3
A reseal layer 35 consisting of a polyolefin synthetic resin layer 34 laminated and formed on one side of 2 with an adhesive layer 33 interposed therebetween, and a hydrophilic film layer 36 having a cellophane or polyvinyl alcohol layer as a hydrophilic layer. laminated on one side of the hydrophilic film layer 36 with a transparent adhesive layer 37 interposed therebetween;
The formed sealing layer 39 consisting of the stretched film layer 38 made of thermoplastic synthetic resin is a synthetic resin having an affinity for the polyolefin-based synthetic resin forming the polyolefin-based synthetic resin layer 34 in the resealing layer 35. The stretched film layer 38 surface of the seal layer 39 is coated with resin,
With the adhesive layer 40 formed in a spot shape, the surface of the polyolefin synthetic resin layer 34 in the resealing layer 35 and the surface of the stretched film layer 38 made of thermoplastic synthetic resin in the sealing layer 39 are bonded and laminated so as to be in contact with each other. It consists of a multi-layered structure.

In the illustrated embodiment, a transparent adhesive layer 37 is provided between the hydrophilic film layer 36 of the seal layer 39 and the stretched film layer 38 made of thermoplastic synthetic resin, and a transparent adhesive layer 37 is provided on one side of the hydrophilic film layer 36. A sealing layer 39 is shown in which a stretched film layer 38 made of thermoplastic synthetic resin is laminated with an adhesive layer 37 in between. In the case where the polyvinyl alcohol layer 36, which is a film layer, is formed by a direct coating operation, the adhesive layer 37 is not necessarily required. However, if the lamination strength between both layers is increased, or if the hydrophilic film layer 36
In the case where the adhesive layer 37 is made of cellophane, an adhesive layer 37 is required. In this case, in the inner sealing material for sealing the container mouth of the present invention, it is essential that the contents inside the container be visible through the sealing layer 39, so the adhesive layer 37 is necessarily It is necessary to use a transparent adhesive.

In the inner sealing material for sealing the container mouth of the present invention having the above-described structure, the stretched film layer 3 made of thermoplastic synthetic resin in the sealing layer 39
Reference numeral 8 serves to provide moisture resistance to the seal layer 39, and is made of a stretched film made of a hydrophobic thermoplastic synthetic resin such as polypropylene, polyamide, or polyester. In addition, the hydrophilic film layer 36 serves to improve the adhesion of a water-soluble adhesive when adhering the inner sealing material 31 to the container opening, and is a cellophane or polyvinyl alcohol layer alone or a cellophane or polyvinyl alcohol layer. It is composed of a vinylidene chloride resin-coated film in which one side of the film is coated with vinylidene chloride resin, but when it is composed of a vinylidene chloride resin-coated film, the cellophane or polyvinyl alcohol layer of the coated film is directly attached to the container mouth side. It is necessary to place it so that it is in contact with the

Furthermore, the paper layer 32 in the reseal layer 35 provides the reseal layer 35 with sufficient cushioning properties to seal the mouth of the container and the necessary rigidity to support the reseal layer 35 inside the cap. The polyolefin synthetic resin layer 34 is
This serves to impart moisture-proofing performance to the reseal layer 35.

The partial adhesive layer 40 is made of, for example, chlorinated polypropylene, ethylene-vinyl acetate copolymer, or any of these materials, which has an affinity for the polyolefin synthetic resin layer 34 in the resealing layer 35 and also has thermal bonding performance. It is made of mixed resin or the like. The adhesive strength provided by the partial adhesive layer 40 is sufficient to maintain the sealing layer 39 even in the case of a cap removal operation in the case of a container equipped with a cap of the type such as a one-touch type cap that requires a small rotation angle of the cap for removal. In order for the adhesive strength to be such that the reseal layer 35 and the reseal layer 35 can be easily peeled off, the partial adhesive layer 40 must be formed in a spot shape within an area range of about 5 to 15% of the interface between the two layers. That's fine.

The inner sealing material of the present invention having the above structure is placed in such a way that the hydrophilic film layer side of the inner sealing material is in contact with the mouth of the container in which the filler such as instant coffee or cream powder is filled. The containers are then bonded together using an adhesive such as POVAL to seal the mouth of the container.
When the cap attached to the container opening is removed from the container opening on the outer side of the inner sealing material, the inner sealing material 31 is generally a seal having a partial adhesive layer 40 on its surface. layer 3
9 and the remaining reseal layer 35, the former leaves the removed cap and remains at the mouth of the container, sealing the contents inside the container, and the latter remains inside the cap while remaining inside the cap. removed along with the

The mechanism of the inner seal material having the above structure will be explained based on FIG. 4.

FIG. 4 shows the case where the cap 51 is removed from a container in which the inner sealing material 31 having the structure shown in FIG. 3 is bonded to the container opening 50 with an adhesive.

The inner sealing material used is a spot-shaped adhesive layer in which the sealing layer 39 and the resealing layer 35 in the sealing material are formed at a ratio of 5 to 15% of the total area between both layers. By 40,
Since the structure is bonded and laminated with extremely weak adhesive strength of about 20 to 50 g/30 mm, the stretched film layer 38 made of thermoplastic synthetic resin in the sealing layer 39 and the polyolefin synthetic resin in the resealing layer 35. The structure is such that peeling from the layer 34 can be easily performed, although not easily separated. Therefore, the cap 51, such as a screw type cap, twist cap, or one-touch type cap, which is mounted on the outer side of the inner sealing material, is rotated, and the cap 51 is attached to the container opening 5.
When removed from 0, the inner sealing material 31 separates into both a sealing layer 39 having an adhesive layer 40 and a resealing layer 35. Therefore, after that, the sealing layer 39 seals the container opening 50, and the resealing layer 35 is separated from the container opening 50 while being loaded on the inner surface of the cap 51.

Next, after the sealing layer 39 is peeled off by the consumer's hands and a portion of the filling inside the container is consumed, the resealing layer 35 loaded on the inner surface of the cap 51 removes the filling inside the container. It functions to seal things.

The inner seal material for sealing the container mouth of the present invention is
The structure is as described above, and the sealing layer and resealing layer of the inner sealing material are bonded with adhesive strength that is neither too strong nor too weak. This prevents the two layers from separating during the process of loading the inner seal material inside the cap, and it can also be applied to one-touch type caps where the rotation angle of the cap is small when removing the cap. When the cap is removed, the seal layer and reseal layer are sufficiently peeled off.
The reseal layer is integrated with the seal layer and does not remain at the container mouth until after the cap is removed from the container mouth, allowing it to perform its original function as an inner seal material and making it easy to handle. It has functions and effects such as.

In addition, since the inner seal material of the present invention includes a paper layer and a polyolefin synthetic resin layer in the reseal layer, the reseal layer is provided with sufficient cushioning properties and rigidity, and the reseal layer is provided with sufficient cushioning properties and rigidity. The polyolefin synthetic resin layer in the layer provides sufficient moisture resistance. Therefore, even after the sealing layer is removed by the consumer's hands, the product still provides excellent sealing and moisture-proofing effects after being re-capped.

Furthermore, the inner seal material of the present invention can be used after removing the cap attached to the mouth of the container.
Since the sealing layer remaining at the mouth of the container is transparent, customers can visually check the contents inside the container before purchasing the product at the store.
It is also effective.

[Brief explanation of the drawing]

Fig. 1 is a partial cross-sectional view showing the structure of a conventional inner seal material, and Fig. 2 is a partial cross-sectional view showing the state in which the inner seal material shown in Fig. 1 is applied to the mouth of a container, and then the cap is removed. , FIG. 3 is a partial cross-sectional view showing an example of the structure of the inner seal material of the present invention, and FIG. It is a partial sectional view showing a removed state. 31: Inner seal material, 32: Paper layer, 34:
polyolefin synthetic resin layer, 35: reseal layer, 36: hydrophilic film layer, 38: stretched film layer made of thermoplastic synthetic resin, 39: seal layer,
40: Adhesive layer.

Claims (1)

[Scope of utility model registration request] A reseal layer has a paper layer made of paperboard or milk balls, a polyolefin synthetic resin layer formed on one side of the paper layer via an adhesive layer, and a cellophane or polyvinyl alcohol layer as a hydrophilic layer. A sealing layer having a hydrophilic film layer and a stretched film layer made of a thermoplastic synthetic resin laminated on one side of the hydrophilic film layer is a synthetic resin having an affinity for the polyolefin synthetic resin layer. The container opening is partially sealed by an adhesive layer formed in a spot shape between the polyolefin synthetic resin layer in the reseal layer and the stretched film layer in the seal layer. Inner seal material for