JPH08156934A - Material to seal spout - Google Patents

Abstract

PURPOSE: To assuredly detect the missing of an affixing of a sealing film at a spout, and prevent a boring due to welding from generating by laminating a surface resin layer which is fused with the internal side of a container with a base layer consisting of a resin in-between, as an opaque layer, and a surface resin layer which comes into contact with a content, as a coloring layer. CONSTITUTION: For a container, blanks on which a spout is provided are formed of a laminated material of which the base material is a paper layer, and a container main body is formed by bending the blanks. When the container is formed, an external film 2 is welded so as to cover the peripheral edge of the spout. Also, a sealing film consists of a laminated material being constituted of a surface resin layer which is welded to the peripheral edge of the spout so as to cover the spout from the inside of the container, and welded to the inside of the container, as an opaque layer 3, and a surface resin layer which comes into contact with a content, as a coloring layer 5. Then, by sensing the color of the coloring layer 5, the missing of the affixing of the sealing film is assuredly inspected. Also, the heat of a heater when a plug is welded is not absorbed by the opaque layer 3 being exposed to the outside, and a boring due to a fusion of the sealing film is prevented from generating.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated material for sealing a spout of a liquid paper container having a laminated structure without using aluminum foil.

[0002]

2. Description of the Related Art Conventionally, a plastic container has been used as a container for filling a liquid, but in recent years, the disposal of the container after the contents have been used causes environmental problems. Paper containers are beginning to be used. For the liquid paper container, a laminated material in which aluminum foil having a gas barrier property against oxygen, water vapor, etc. is laminated may be used depending on the use condition. However, since aluminum foil becomes a lump when incinerated, environmental problems occurred when it was discarded, as with plastic containers. Therefore, instead of the aluminum foil, a laminated material in which an inorganic compound such as silicon oxide having a gas barrier property against oxygen and water vapor which is almost equal to that of the aluminum foil is provided by a method such as vapor deposition and sputtering has been used.

Further, the liquid paper container is provided with a spout for the liquid content, and the spout is covered with a sealing film. In order to provide the sealing film with gas barrier properties, it is necessary to use a laminated material containing aluminum foil, which causes the same environmental problems as the container body. Therefore, for the above-mentioned sealing film, a laminated material which does not have an aluminum foil laminated and which has a gas barrier property similar to the container has begun to be used. As a specific laminated constitution of this laminated material, a laminated material composed of a gas barrier resin film / black resin film having at least a vapor deposition layer of silicon oxide or the like was used.

As described above, the reason why the above laminated material is used as the sealing film is that it is possible to inspect by light whether or not the sealing film is surely provided in the container molding process. Here, the base layer itself having a gas barrier property may be colored, but due to problems such as strength of the sealing film, hygiene problems with contents, price problems, and adhesion strength between laminated layers, it is usually Such laminated materials are used.

Polyethylene resin is used as a material for the black resin film. This is because when the spout is opened, it can be easily opened, and there is no hygiene problem. In addition to polyethylene resin, polypropylene resin or the like may be used depending on the content.

[0006]

However, when the above-mentioned laminated material containing no aluminum foil is used, the so-called window bonding process suitability, in which the spout of the liquid paper container is covered with a sealing film, does not cause any problem. There is a problem in the process of attaching the spout to the spout. That is, the spout is attached to the spout from the outside, and therefore heat is applied to the outer surface of the spout by a heat heater or the like, but this heat is absorbed by the black resin film of the sealing film and the sealing film melts. Occasionally there were holes.

On the other hand, without using a black resin film,
For example, when a layered material composed of an opalescent layer / base material layer is used as a layered material for spouting, there is no problem of perforation due to melting of the sealing film, but there is a problem that the window sticking of spouting cannot be inspected. That is, this is because the color of the sealing film made of a laminated material that does not use aluminum foil and the color inside the container are very similar to each other, so that even if the sealing film is forgotten attached to the spout, it cannot be confirmed.

Therefore, the present invention is capable of reliably inspecting for forgetting to stick the sealing film at the spout of a liquid paper container made of a laminated material which does not use aluminum foil, and is capable of piercing due to melting at the time of welding the spigot. The present invention provides a sealing material for a spout that can prevent the above.

[0009]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and covers a spout provided in a liquid paper container made of a laminated material having a paper layer as a base material. In the sealing film that is welded from the inside of the container,
It is a material for sealing a spout which is made of a laminated material in which a base material layer made of a resin is provided in between, a surface resin layer which is welded to the inside of the container is an opalescent layer, and a surface resin layer which is in contact with the contents side is a colored layer.

Further, the above-mentioned material for sealing a spout, which uses a black layer as the colored layer.

[0011] Further, in the above-mentioned material for sealing the pouring outlet, a polyethylene resin is used as the resin of the opacifying layer and the coloring layer.

Further, in the sealing film which is welded from the inside of the container so as to cover the spout provided in the liquid paper container made of the laminated material including the paper layer as the base material and including the gas barrier layer, the base material layer is used as the gas barrier. The above-mentioned material for sealing a spout, which is molded from a resin having properties.

[0013]

As described above, the structure of the laminated material for spout according to the present invention is such that the base material layer made of resin is provided between the surface resin layer which is welded to the inside of the container and the surface resin layer which is in contact with the contents side. Since it is a laminated material that is a colored layer, by knowing the color of the colored layer, it is possible to reliably inspect whether the sealing film is left unattached, and the heat of the heater used to weld the spout is exposed to the outside. It is not absorbed by the milky white layer and prevents perforation due to melting of the sealing film.

Further, by using the gas barrier layer as the base material, the container body can be provided with a gas barrier property and the deterioration of the contents can be prevented.

[0015]

EXAMPLES Paper is used as the base material of the laminated material of the liquid container of the present invention. Further, as the gas-barrier layer of the container body, for example, a film deposited with an inorganic compound such as silicon oxide, a barrier film such as ethylene-vinyl alcohol copolymer is used. Depending on the item, it is appropriately selected and used.

The shape of the container using the pouring spout laminated material of the present invention as a sealing film welded from the inside of the container may be a gobel top type or brick shape at the ceiling of the container body, regardless of the shape of the container body. It suffices that a spout for discharging the contents is provided, and the spout may have a round shape, a square shape, or the like. An outer film for welding the spout is provided near the outer periphery of the spout. As the outer film, a film that can be welded to the container body and the spout may be used, and the shape may be a donut shape having an inner diameter slightly smaller than the shape of the spout, and A circular shape that covers the outlet may be used.

The spouting laminated material of the present invention is a laminated material in which a base material layer made of a resin is provided in between, a surface resin layer welded to the inside of the container is an opalescent layer, and a surface resin layer in contact with the contents side is a colored layer. Consists of. The colored layer is a layer used for confirming that the sealing film is left unattached, and is provided for inspection by the presence or absence of passage of inspection light, reflection, color difference, or the like.

The opalescent layer is a layer provided to prevent perforation of the sealing film without absorbing the heat of the heater used for welding the spout to the spout. As the sealing film that seals the spout from the inside of the container by welding, when the content is food, a film that does not cause food hygiene problems is used.
When a resin having a gas barrier property is used for the substrate, polyethylene terephthalate, stretched polypropylene, stretched nylon or the like can be used, and further, an inorganic compound layer such as a silicon oxide layer or a magnesium oxide layer in the above film, The barrier property can be improved by providing a metal layer such as an alumina layer.

As the milky white layer, titanium white,
A white pigment such as calcium carbonate may be contained in a resin such as polyethylene, or the resin film may be white-printed to whiten the material to be used as a resin film. Further, for the colored layer in contact with the contents, the resin may contain a coloring pigment such as carbon black, as in the case of the opalescent layer. The colored layer can also be formed by providing colored printing on the surface of the resin film. However, when the coloring layer is provided by the printing layer, it cannot be used when the printing ink dissolves in the content.

The resins used as the colored layer and the opalescent layer are polyethylene, polypropylene, nylon,
Polyester or the like, and particularly polyethylene is used. The layer thickness of the spout laminated material is preferably about 40 to 80 μm, and the thickness of each layer is 20 in the opalescent layer.
The thickness is about 40 to 40 μm, and the thickness of the colored layer is 10 to 40 μm.

An embodiment of the present invention will be described below with reference to the drawings. The laminated material of the container body used in this example is
It is a material in which a film obtained by vapor-depositing silicon oxide on polyethylene terephthalate using a paper layer as a base material is laminated as a barrier film. A blank provided with a spout is formed from this laminated material, and the blank is bent to form a container body.

During molding of the container, the outer film 2 is welded so as to cover the periphery of the spout. The outer film 2 has a circular shape, and the layer structure is polyethylene (40 μm) / polyethylene terephthalate (12 μm) / polyethylene (40 μm).
μm). Further, the sealing film is welded to the periphery of the spout so as to cover the spout from the inside of the container, and has a circular shape. The layer structure is milk white polyethylene 3 (30 μm) made of polyethylene mixed with titanium white / polyethylene terephthalate 4 (1) deposited with silicon oxide.
Black polyethylene 5 (40 μm) made of polyethylene mixed with 2 μm) / carbon black.

FIG. 1 shows a container molded as described above, filled with contents, and heat-sealed and sealed at the top. Next, the outer film 2 is heated by a heater to weld the spout 6 to form a container as shown in FIG. Further, the spout 6 may be attached after filling the contents.

The present invention and the conventional example will be compared below. <Laminated Structure> Sealing Film of Examples It is milky polyethylene (30 μm) / polyethylene terephthalate (12 μm) deposited with silicon oxide / black polyethylene (40 μm). Sealing Film of Comparative Example A polyethylene terephthalate (12 μm) / black polyethylene (40 μm) vapor-deposited with silicon oxide.

As the outer film, the same film as that of the example having a skin is used in both the examples and the comparative examples. <Experimental Method> The number of holes in the sealing film when heating the outer film in 200 containers is compared using the heater used for welding the spout.

Table 1 shows the experimental results.

[0027]

[Table 1]

As shown in Table 1, when sealing the outer film by heating the outer film in order to apply the spout, holes are formed in the sealing film in the comparative example, but such a problem occurs in the examples of the present invention. Absent. Since both of them use the black resin film on the inner side, it is possible to reliably perform the inspection for forgetting to attach the sealing film at the time of molding the container.

[0029]

As described above, in the spout-sealing material of the present invention, even if it is heated by the heater for welding the spout, no hole is formed in the sealing film.

Further, since the colored layer is provided, it is possible to surely inspect whether the sealing film is forgotten when forming the container.

Further, by coloring the gas barrier layer on the material for sealing the spout, a gas barrier layer similar to that of the container can be provided and deterioration of the contents can be prevented.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing a liquid paper container using an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view showing a state after the spigot is welded to the liquid paper container of FIG.

[Explanation of symbols]

 1 ... Container body 2 ... Outer film 3 ... Milky layer 4 ... Base material layer 5 ... Black layer 6 ... Plug

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Noriyuki Sasaki Inventor Noriyuki Sasaki 1-5-1 Taito, Taito-ku, Tokyo Toppan Printing Co., Ltd.

Claims (4)

[Claims] 1. A sealing film which is welded from the inside of a container so as to cover a spout provided in a liquid paper container made of a laminated material having a paper layer as a base material, and a base material layer made of a resin is provided between them. A material for sealing a spout, comprising a layered material in which a surface resin layer that is welded to the inside of the container is an opalescent layer, and a surface resin layer that contacts the contents side is a colored layer. 2. The spout-sealing material according to claim 1, wherein a black layer is used as the colored layer. 3. The spout sealing material according to claim 1, wherein a polyethylene resin is used as the resin of the opacifying layer and the colored layer. 4. A sealing film which is welded from the inside of a container so as to cover a spout provided in a liquid paper container made of a laminated material including a paper layer as a base material and including a gas barrier layer, wherein the base material layer is a gas barrier. The spout-sealing material according to any one of claims 1 to 3, which is formed of a resin having a property.