JPH092464A - Structure of mouth part of paper container for liquid and method for forming the mouth part - Google Patents

Abstract

PURPOSE: To prevent the deterioration of contents stored in a container due to oxidation by restraining oxygen delivered from the inner periphery in a through hole from penetrating into the container by providing an inside waterproof film on one inner side of the container and a window bonding film bonded to the container from the outside thereof. CONSTITUTION: A through hole 3 is formed through a base material 2 and an outside waterproof layer 5 and an inside waterproof film 17 having gas- barrier property is bonded to one container inside surface 6 of the base material 2. And a window bonding film 19 having gas-barrier property is bonded to a container outside surface 4 to cover the inner periphery end surface of the through hole with the film 17 and the film 19. Further a mouth part 11 is formed in a bonding area of the film 19 and film 17 and a tab tape 12 is releasably bonded to the film 19 to cover the mouth 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid paper container having a drinking portion sealed with a tab tape, and more specifically, a paper container having a drinking portion protecting the inner peripheral end surface of a through hole of a base material. The present invention relates to a method for forming the mouth part.

[0002]

2. Description of the Related Art In recent years, in the field of liquid foods such as fruit juice drinks, coffee, liquid soups and lactic acid drinks, for example, as shown in FIG.
A liquid in which a body member a as shown in (b), a top member d having a drinking portion c sealed with a tab seal b, and a bottom member e are provided by a base material made of a laminated material and heat-sealed to each other. Paper containers f have come to be used in a wide range.

The laminated material used as the base material of this liquid paper container is a laminate of a synthetic resin layer, a paper layer, a metal foil layer, a metal vapor deposition thin film layer, and the like. A synthetic resin layer having a heat melting property and a waterproof property was provided on one surface and one surface on the outside of the container. At the mouth of this paper container, it is necessary to devise a method to prevent the contents from permeating the inner peripheral end surface of the through hole that serves as the mouth.
Various proposals have been made as disclosed in Japanese Patent Publication No. 9496. One of them is shown in FIG. In this technique, the mouthpiece 1 has a base material (laminated material) 2 having a hole of a predetermined shape to obtain a through hole 3, and further, a thermoplastic resin material or the like is provided on one outer surface 4 of the container of the base material 2. Laminate the outer waterproof layer 5
And an inner waterproof film 9 in which a barrier layer 7 having a gas barrier property and a synthetic resin layer 8 are laminated on the one inner surface 6 side of the container, and an inner waterproof layer 10 is laminated. A drinking port 11 is formed in the bonded portion of the through holes 3 of the waterproof layers 5 and 10 inside and outside. Then, the tab tape 12 is detachably attached to the outer waterproof layer 5. Tab tape 12
Is a laminate of a barrier layer 13 made of aluminum foil or the like and having a gas barrier function, and an adhesive resin layer 14 for facilitating bonding with the outer waterproof layer 5.

Further, as shown in FIG. 5, a structure of a drinking portion using a window pasting film has also been proposed. In the drinking mouth part 1 of this technique, the outer waterproof layer 5 is laminated and formed on the one outer surface 4 of the container of the base material 2, and the outer waterproof layer 5 and the base material 2 are punched out.
The inner waterproof film 9 is laminated on the one inner surface 6 of the container of the base material 2 after obtaining the through hole 3 penetrating through the inner waterproof layer 9 and the inner waterproof film 9 exposed by the through hole 3 is formed. To the outer waterproof layer 5, the window sticking film 15 is stuck so as to cover the through hole 3, and the drinking port 11 is opened in the stuck part in the through hole 3, and this is covered with the tab tape 12 in the same manner as described above. It was. The inner waterproof film for obtaining the inner water resistant layer has a layered structure in which a metal foil or the like is selected and laminated. Depending on the selection of those materials, contents such as gas barrier property and light shielding property are selected. It has a protection function.

[0005]

However, the synthetic resin material and the resin film forming the outer waterproof layer and the inner waterproof layer shown in FIG. 4 are stuck together in the through hole, and FIG. In the case of using the window pasting film, the following problems occurred. That is, in the structures of the above two examples, the outer waterproof layer formed by laminating the synthetic resin material sufficiently fulfills its waterproof function, the window sticking film improves the tab sheet sticking, and protects the inner peripheral edge of the through hole. However, the outer waterproof layer and the window sticking film cannot prevent the permeation of oxygen. As shown in the figure, oxygen 16 permeates the outer waterproof layer 5 and the base material 2 from the outside, and the oxygen permeates through the through holes. From the inner peripheral edge of the hole, it penetrates through the outer waterproof layer 5 (Fig. 4) and the window sticking film 15 (Fig. 5) and enters the container, and the oxygen that has entered may cause the contents to be oxidatively deteriorated. there were.

For this reason, it is considered that the synthetic resin material forming the outer waterproof layer of the base material has gas barrier properties similar to the inner waterproof film, but the problem of increasing the member cost of the paper container. There is. In addition, as the film having a gas barrier property to be laminated on the surface of the base material, an aluminum foil, a laminated film in which a stretched polyester film is laminated is selected because of its gas barrier property, strength against bending and the like. In general, these films have low heat-sealing properties, and therefore, the laminated film is used in the drinking part having a structure in which the resin films forming the outer waterproof layer and the inner waterproof layer are bonded to each other as shown in FIG. Cannot be used as an outer waterproof layer.

Therefore, according to the present invention, the oxygen leaking from the inner peripheral edge of the through hole enters the inside of the container so that the inner waterproof film provided on one side of the inside of the container and the window sticking film attached from the outside of the container. The object is to prevent the contents stored in the container from being oxidized and deteriorated.

[0008]

The present invention has been made in view of the above problems, and penetrates a base material of a paper container and an outer waterproof layer made of a synthetic resin laminated on one outer surface of the base material. An inner waterproof film having a gas barrier property, which is bulged inward from the inner side of the container to the inside of the container in the through hole formed in a smaller size than the through hole. A window corresponding to the inner waterproof film through hole, which is formed by adhering around the through hole of the outer waterproof layer and protruding over the inner side of the through hole and having a gas barrier property having a smaller size than the through hole. A drinking hole formed by sticking the inner waterproof film through hole and the inner edge of the window sticking film through hole to each other is provided inside the through hole, and the inner edge is stuck to each other. The inner waterproof film and the window sticking film cover the inner peripheral end surface of the through hole of the base material, To solve the above-mentioned problems, by providing a tab tape to a window sticking film so that the tab tape can be peeled off, and the drinking tape is covered with the drinking tape, the structure of the drinking mouth part of a liquid paper container is provided. is there.

Another aspect of the present invention is to provide a base material of a paper container having an outer waterproof layer made of a synthetic resin on one outer surface of the container with a through hole penetrating the base material and the outer waterproof layer, An inner waterproof film having a gas barrier property and overhanging inward of the through hole is attached to one side of the inside of the container of the holed hole, and the inner waterproof film exposed in the through hole is transparent. A window sticking film, which is larger than the through hole and has a gas barrier property, is attached to the outer waterproof layer at the periphery of the hole, and the inner waterproof film and the window sticking film cover the inner peripheral end surface of the through hole of the base material to attach the window. In the area where the film and the inner waterproof film are attached,
A drinking port penetrating the window sticking film and the inner waterproof film, a tab tape is releasably attached to the window sticking film, and the drinking tap is covered with the tab tape. The present invention provides a method for forming a mouthpiece, which solves the above problems.

[0010]

In the present invention, the inner peripheral edge of the through hole of the base material is covered with the window barrier film having the gas barrier property and the inner waterproof film having the gas barrier property as well, and permeates the outer waterproof layer and the base material. The oxygen that comes in suppresses entering the container.

[0011]

EXAMPLES The present invention will be described in detail with reference to the examples shown in FIGS. First, the base material of the liquid paper container is a laminated material in which a synthetic resin material or a synthetic resin film is laminated with paperboard as a main material, and a metal thin film layer and a metal vapor deposition layer are provided depending on the application. From inside to inside of the container, paperboard layer (220 g / m ² ) / polyethylene layer (20 μm thickness) / polyethylene layer (15 μm thickness) / biaxially stretched polyethylene terephthalate film layer (12 μm)
Thickness) / silicon oxide vapor deposition thin film layer (400 Å thickness). In the case of the container of the form shown in FIG. 3, the body member, the top member, and the bottom member each have a synthetic resin material laminated on one outer surface of the container of the base material to form an outer waterproof layer. The inner waterproof film having a gas barrier property is laminated on one surface of the inner side of the container.

FIG. 1 (G) shows an example in which the present invention is applied to the drinking portion 1 of the top member of the liquid paper container,
In the structure of the drinking portion 1, the through hole 3 is opened through the base material 2 and the outer waterproof layer 5 laminated on the one outer surface 4 of the container of the base material 2. Inside the through hole 3,
An inner waterproof film 17 which is formed by laminating and is formed as an inner waterproof layer 10 is bulged inward of the through hole 3 and is formed in a smaller size than the through hole 3, and an inner waterproof film through hole 18 is arranged and the outer waterproof film is provided. A window sticking film 19 is stuck around the through hole of the layer 5, and the window sticking film 19 projects to the inside of the through hole and is made smaller than the through hole 3 so as to correspond to the inner waterproof film through hole 18 The film through holes 20 are arranged so as to overlap each other. Further, inner edges 18a of the inner waterproof film through hole 18 and the window sticking film through hole 20 are provided.
A drinking port 11 formed by pasting together 0a is opened inward of the through hole 3, and an inner circumferential end face 21 of the through hole is covered by pasting the inner edges 18a, 20a together.

At the mouth part 1, one side 6 of the base material 2 inside the container
The inner waterproof film 17, which is to be laminated on the inner waterproof layer 10 to form the inner waterproof layer 10, is formed as shown in FIG.
It is a laminated film in which an adhesive resin layer 22, a barrier layer 23 having a gas barrier property, and a synthetic resin film layer 24 are laminated from the side, and the barrier layer 23 is composed of a silicon oxide vapor deposition thin film, an aluminum thin film and the like. Further, the window pasting film 19 is also a laminated film, and the adhesive resin layer 25 and the barrier layer 2 having a gas barrier property from the base material 2 side.
6. The synthetic resin film layer 27 has a layer structure, and the barrier layer 26 is composed of a silicon oxide vapor-deposited thin film, an aluminum thin film, etc., like the barrier layer 23. Then, the adhesive resin layer 22 of the inner waterproof film 17 and the adhesive resin layer 25 of the window sticking film 19 are welded inside the through hole 3, whereby the inner waterproof film 17 and the window sticking film 19 are passed through. It covers the inner peripheral end face 21.

In this way, the inner peripheral end surface 21 of the through hole is covered with the protruding portion of the inner waterproof film 17 and the protruding portion of the window sticking film 19, and these protruding edges, that is, the inner edges 18a, 20a.
Are adhered to each other, the contents of the container do not soak into the edge of the base material 2. A tab tape 1 formed by laminating a barrier layer 13 and an adhesive resin layer 14 on the window sticking film 19 in the same manner as the above-mentioned conventional example.
2 is releasably attached to the outer peripheral portion (the portion attached to the outer waterproof layer 5) of the window attachment film 19, and the drinking tape 11 is covered with the tab tape 12 (FIG. 1 (G)). Since both the inner waterproof film 17 covering the inner peripheral end face 21 of the base material and the window sticking film 19 both have gas barrier properties, they penetrate the outer waterproof layer 5 and the base material 2 and the inner peripheral surface of the base material. Oxygen reaching the end surface 21 does not pass through the inner waterproof film 17 and the window sticking film 19, and therefore oxygen can be prevented from entering the inside of the container. Of course, since the tab tape 12 itself also has a gas barrier property, it is provided so that oxygen does not permeate the tab tape 12.

To obtain the drinking portion 1 having the above structure,
As shown in FIG. 1, first, a base material 2 is supplied in the form of a sheet (A), and a desired synthetic resin material or a synthetic resin film is laminated on one outer surface 4 of the container of the base material 2 to provide external waterproofing. Form layer 5 (B). After the outer waterproof layer 5 is formed, a through hole 3 penetrating the base material 2 and the outer waterproof layer 5 is formed at a required location (C). Next, the required inner waterproof film 17 is formed on the container inner surface 6 of the base material 2 in which the through holes 3 are formed.
Is laminated to form the inner waterproof layer 10 so that the inner waterproof film 17 is exposed in the through holes 3 (D). Then, from the inner waterproof film 17 exposed in the through hole 3 to the outer waterproof layer 5 at the periphery of the through hole 3, the window sticking film 19 which is larger than the through hole 3 and can cover the through hole 3 is heat-sealed. Attach it at (E). The window-bonding film 19 and the inner waterproof film 17 are thermoplastic resin layers typified by polyethylene resin on the surfaces in contact with each other, so that heat sealing with the inner waterproof film 17 is improved.

After the window sticking film 19 and the inner waterproof film 17 are stuck to each other, the sticking portion 18 is obtained inside the through hole 3, and then the window sticking film 19 and the inner waterproof film are provided inside the sticking portion 18. Open a drinking spout 11 that penetrates 17 and 17 (F). Since the inner edge 20a of the window sticking film 19 and the inner edge 18a of the inner waterproof film 17 are heat-sealed to each other, the periphery of the drinking port 11 does not have a gap, therefore,
The contents do not soak into the inner peripheral end surface 21 of the through hole. As described above, a paper container is manufactured from the top member from which the drinking mouth 11 is obtained, other body members, and the bottom member. Then, the contents are filled in these with a filling machine, and after the filling is completed, as shown in (G), the tab tape 12 is located on the outer waterproof layer 5 of the window sticking film 19 (the window sticking film). The outer periphery 11) is heat-sealed to cover the drinking spout 11, whereby the drinking spout 1 having an openable structure is obtained and the paper container is completed.

In the embodiment shown in FIG. 1, an inner waterproof film is laminated on one side of the base material inside the container to form an inner waterproof layer and is exposed in the through hole. There is something. However, the inner waterproof film may be provided on one side of the inside of the container in the same manner as the window sticking film attached to the through hole from the outside of the container. An example is shown in FIG. In the embodiment shown in FIG. 2, an outer waterproof layer 5 is laminated on one outer surface 4 of the container on the base material 2 for forming the drinking mouth 1, and one inner surface of the container is formed. The inner waterproof film 10 having a gas barrier property is laminated on the inner layer 6 to form the inner waterproof layer 10. The through-hole 3 is opened through the outer waterproof layer 5, the base material 2, and the inner waterproof layer 10, and the inner waterproof film 30 is provided so as to cover the through-hole 3 from the one inner surface side of the container.

The inner waterproof film 30 comprises an adhesive resin layer 31 and a barrier layer 3 having a gas barrier property from the base material 2 side.
2. The synthetic resin film layer 33 is laminated,
It is a laminated film having gas barrier properties. And
The inner waterproof film 30 is used as a window sticking film, is supplied to the opened through-hole side, is stuck to the above-mentioned inner-sticking film 29 around the through-hole, and is provided so as to project to the through-hole 3. Inside the through hole 3, the inner waterproof film 30 is attached to the window attachment film 19 attached from the outside of the container as in the above-mentioned embodiment, and the drinking port 11 is provided in the attachment portion. . Similar to the above-mentioned embodiment, the window barrier film 19 having a gas barrier property and the above-mentioned inner waterproof film 3
Since the inner peripheral end surface of the through hole is covered with 0, penetration of the contents into the base material can be prevented, and at the same time, the inner peripheral end surface 21 of the through hole permeates the outer waterproof layer 5 and the base material 2. Oxygen reaching to the inside of the container will be suppressed. The tab tape 12 is attached to the window attaching film 19 as in the above embodiment.

[0019]

The present invention has the configuration described above. In this way, since the window sticking film and the inner waterproof film, both of which have gas barrier properties, are stuck inside the through hole and cover the inner peripheral end surface of the through hole, the contents are the inner peripheral end surface of the through hole of the drinking portion. In addition, it prevents oxygen that has penetrated the outer waterproof layer and the base material and has reached the inner peripheral end surface of the through hole from entering the inside of the container, preventing oxidative deterioration of the contents. can do. And since it is not necessary to form the outer waterproof layer of the substrate from a film having a gas barrier property,
It is highly practical in that it does not increase the material cost of the paper container.

[Brief description of drawings]

FIG. 1 shows a manufacturing sequence of a mouthpiece structure of a liquid paper container according to the present invention, in which (A) is an explanatory view showing a base material, and (B).
Is an explanatory view showing a state in which an outer waterproof layer is formed, (C) is an explanatory view showing a state in which a through hole is formed, (D) is an explanatory view showing a state in which an inner waterproof layer is formed, and (E) is a window sticking It is explanatory drawing which shows the state which stuck the film, (F) is explanatory drawing which shows the state which formed the drinking mouth, (G) is explanatory drawing which shows the state which stuck the tab tape.

FIG. 2 is an explanatory view showing another embodiment in section.

3A and 3B show a paper container, in which FIG. 3A is an explanatory view showing the outer appearance of the container, and FIG. 3B is an explanatory view showing a cross section.

FIG. 4 is an explanatory view showing a conventional example in cross section.

FIG. 5 is an explanatory view showing another conventional example in section.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Drinking part 2 ... Base material 3 ... Through hole 5 ... Outer waterproof layer 10 ... Inner waterproof layer 11 ... Drinking mouth 12 ... Tab tape 19 ... Window sticking film 17,30 ... Inner waterproof film 19 ... Window sticking film 21 ... Transparent Inner edge of hole

Claims (6)

[Claims] 1. A through hole formed through a base material of a paper container and an outer waterproof layer made of a synthetic resin laminated on one surface of the base material outside the container. An inner waterproof film through-hole formed by opening an inner waterproof film having a gas barrier property that is bulged inward from the through-hole in a smaller size than the through-hole, and by adhering around the through-hole of the outer waterproof layer to the inside of the through-hole. A window sticking film having an overhanging gas barrier property is made smaller than the through hole to provide the inner waterproof film through hole and the corresponding window sticking film through hole, and the inner waterproof film through hole and the window. The drinking hole formed by sticking the inner edges of the sticking film through hole to each other is located inside the through hole, and the inner waterproof film and the window sticking film stuck to each other of the inside edges are the inner peripheral end surface of the through hole of the base material. Cover, and attach the tab tape to the window sticking film in a peelable manner, A drinking mouth part structure of a liquid paper container, wherein the drinking tape is covered with the tab tape. 2. The liquid mouth container structure according to claim 1, wherein the inner waterproof film is an inner sticking film laminated on one side of the inner side of the container of the base material. 3. The liquid paper container according to claim 1, wherein the inner waterproof film is a window sticking film stuck to a through hole of a base material having an inner sticking film laminated on one side of the container in advance. Drinking part structure. 4. A through hole that penetrates the base material and the outer waterproof layer is formed in a base material of a paper container having an outer waterproof layer made of a synthetic resin on one side of the container, and the through hole is formed. On one side of the inner side of the container of the base material, an inner waterproof film having a gas barrier property and protruding to the inner side of the through hole is adhered, and the inner waterproof film exposed in the through hole is provided on the periphery of the through hole. A window sticking film, which is larger than the through hole and has gas barrier properties, is stuck to the outer waterproof layer, and the inner waterproof film and the window sticking film cover the inner peripheral end surface of the through hole of the base material. To provide a drinking hole that penetrates the window sticking film and the inner waterproof film in the area where the waterproof film is stuck, and to attach the tab tape to the window sticking film in a peelable manner, and to cover the drinking mouth with the tab tape. Shape of the mouth of a liquid paper container characterized by Method. 5. The method for forming a drinking mouth portion of a liquid paper container according to claim 4, wherein the inner waterproof film is an inner sticking film laminated on one inner surface of the container of the base material. 6. The liquid paper container according to claim 4, wherein the inner waterproof film is a window sticking film stuck to a through hole of a base material in which an inner sticking film is previously laminated on one inner surface of the container. Method of forming the mouth part.