JP2000229630A - Paper container with spout - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paper container with a spout wherein the spout joined from the inside can be easily separated. SOLUTION: The paper container is formed of a paperboard 1 mainly comprising a paper layer and having a thermoplastic resin layer as the innermost layer, wherein a hole 2 as a spout is provided on a predetermined position and a spout 10 with a flange which is molded of a thermoplastic resin is inserted from the inside of the hole to be hot-bonded to an internal surface of the paperboard 1 at the flange 11. In this case, the flange 11 of the spout 10 is joined with the innermost layer of the paperboard 1 via a peelable film F. Since the spout 10 can be removed after use by peeling at the peelable film F, the paperboard 1 can be easily recycled with the spout 10 separated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper container for storing liquids such as beverages, seasonings, detergents, pharmaceuticals, industrial chemicals and the like, and more particularly, to a paper container having a resin molded product spout. Belongs to the technical field.

[0002]

2. Description of the Related Art Conventionally, when manufacturing a paper container with this kind of spout, a hole for a spout is provided at a predetermined position of the paper container, and a spout provided with a flange at a lower portion is formed from the inside of the hole. A method is employed in which the flange is inserted into the inner surface of the paperboard by thermal bonding using an ultrasonic seal. In other words, the paper container is made of paperboard with a thermoplastic resin laminated on the innermost layer, and the spout is also made of a molded product of thermoplastic resin, so the spout is thermally bonded to the inner surface of the paperboard at its flange. Is brought into a joined state.

[0003]

In the above-mentioned conventional paper container with a spout, the spout is firmly joined to the inner surface of the paperboard at the flange portion by thermal bonding. Therefore, there is a problem that it is not easy to remove the spout when trying to recycle the paperboard.Currently, the only way to dispose of it is to dispose of it. In contrast.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a paper container with a spout capable of easily detaching a spout joined from the inside. To provide.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is made of a paperboard having a paper layer as a main body and a thermoplastic resin layer as an innermost layer. In a paper container with a spout provided with a hole and having a flanged spout formed of a thermoplastic resin inserted from the inside of the hole and joined to the inner surface of the paperboard at the flange portion by heat bonding, Is bonded to the innermost layer of the paperboard via a release film.

[0006]

1 shows an example of a paper container with a spout according to the present invention, and is a partial cross-sectional view passing through a center line of the spout. As shown in the drawing, a paperboard 1 constituting a paper container is provided with a hole 2 for a spout at a predetermined position, and a spout 10 is inserted from the inside of the hole 2 to form a paperboard at its flange 11. 1, the flange 11 of the spout 10 is joined to the innermost layer of the paperboard 1 via a release film F in the present invention. The release film F has a donut shape, the inner hole has a size through which the cylindrical portion 12 of the spout 10 passes, and the outer diameter is larger than the flange 11.
In this case, the portion of the release film F protruding from the flange 11 is not adhered to the paperboard 1. In the figure, reference numeral 13 denotes a sealing portion provided at the bottom of the cylindrical portion 12 and has a pull ring 15 for tearing the thin portion 14 to form an opening. Reference numeral 16 denotes a thread for engaging a cap (not shown).

[0007] As the paperboard forming the paper container, any known layer configuration corresponding to the type of the content liquid to be stored may be used as long as the paperboard is mainly used and the thermoplastic resin layer is the innermost layer. It is possible. Specifically, PE / paper / P
E, PE / paper / PE / PET, PE / paper / PE / evar / PE, PE / paper / PE / Al / PE, PE / paper / P
E / Al / PET / PE, PE / paper / PE / Al / Ny
/ PE, PE / paper / PE / Ny / PE and the like.

As the spout, a molded product obtained by injection molding a thermoplastic resin such as polyethylene is used. In terms of shape, it has a flange for attachment at the bottom, what kind of type as long as it can be inserted from the inside into the hole provided in the paper container and the flange part can be thermally bonded and joined to the inner surface of the container It may be one piece as shown in FIG. 1 or a known two piece.

There are three types of release films: a type that peels off at the interface with the innermost layer or spout of the paperboard, a type that peels off between those layers in a multilayer structure, and a type that peels off by cohesive failure of the film itself. Any of them may be used. Specific examples of the release film that peels off at the interface include ionomer / PE. Specific examples of the type of delamination include PE / PP / PE. PE + PS / PE, PE + P as cohesive failure type
B / PE, PE + PP / PE. These release films have a thickness of about 30 to 50 μm. This film may be used alone, but may be laminated with a biaxially stretched film of polypropylene, nylon, polyester or the like. In this case, a PE film is laminated on the other surface.

The mounting of the release film and the spout is as follows. First, a release film cut into a donut shape is prepared, and this release film is affixed to the periphery of the inside of the spout hole provided at a predetermined position of the paperboard by heat sealing. Next, in the course of assembling the paper container, a spout is inserted from the inside of the hole, and is joined to the periphery of the hole at the flange portion, that is, to the release film by ultrasonic sealing.

In order to remove the spout from the paper container as shown in FIG. 2, first, the paper container is developed, and then the release film is peeled off by holding the protruding portion where the adhesive film is not adhered. Alternatively, the spout is pushed from the outside or the spout is impacted from the outside. When the latter method is adopted, the release film may be hidden by the spout flange, but it is preferable to provide a protruding portion as shown in FIG. FIG. 2 shows a case where the release film F of the type that causes cohesive failure is peeled off.

[0012]

(Example 1) As a paperboard constituting a paper container,
PE (30 μm) / paper (400 g / m ² ) / ethylene-
Methacrylic acid copolymer (30 μm) / Al (7 μm) /
A laminate consisting of dry lami / PET (12 μm) / dry lami / low-density polyethylene film (60 μm) was prepared, and a circular hole for attaching a spout was punched out at a predetermined position on the paperboard. Next, a release film having the following layer structure A was heat-sealed around the circular hole, and then the body end was covered with skive hemming and bonded to the other end. Then, the container was formed into a goebel top shape by a filling machine, and a spout made of polyethylene was inserted from the inside, and the flange portion was joined by ultrasonic waves to produce a paper container with a spout.

<Layer Structure A> Low density polyethylene (2 μm)
m) / polypropylene (30 μm) / polypropylene 6
0 parts by weight and 40 parts by weight of ethylene butene-1 copolymer (10 μm) / low density polyethylene (20 μm)

(Example 2) The following layer structure B was formed on a release film.
A paper container with a spout was prepared in the same manner as in Example 1 except that the release film was used.

<Layer Structure B> Zn-based ionomer (40 μm)
m) / Low density polyethylene (60 μm)

After unsealing and unfolding any of the paper containers manufactured in Examples 1 and 2, the spout is easily detached from the paperboard by pulling on the unbonded protruding portion of the release film. Was completed.

[0017]

As described above, in the paper container with a spout according to the present invention, the spout is connected to the innermost layer of the paperboard via the release film at the flange portion. It can be peeled off at the release film and removed. Accordingly, the spout can be detached to facilitate the recycling of the paperboard.

[Brief description of the drawings]

FIG. 1 shows an example of a paper container with a spout according to the present invention, and is a partial cross-sectional view passing through a center line of the spout.

FIG. 2 is an explanatory view showing a state where a spout is removed from the paper container of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Paperboard 2 hole 10 Outlet 11 Flange 12 Tube part 13 Sealing part 14 Thin part 15 Pull ring 16 Thread 20 Film

Continued on the front page F-term (reference) 3E060 BC01 BC04 CF06 DA30 EA03 EA13 EA14 EA20 3E067 AA03 AB26 AB28 AB81 AB96 BB01A BB14A BB25A CA24 EA06 EB34 EC25 GD08 3E084 AA34 AA37 AB01 BA03 CA01 CB01 CC04 DB01 CB01 DB04 GB08 GB17 KB01 LA03 LA17

Claims (5)

[Claims] 1. A spout is formed of a paperboard having a paper layer as a main component and a thermoplastic resin layer as an innermost layer, a hole for a spout at a predetermined position, and a spout with a flange formed of a thermoplastic resin. In a paper container with a spout that is inserted from the inside of the hole and is bonded to the inner surface of the paperboard by thermal bonding at the flange portion, the flange of the spout is bonded to the innermost layer of the paperboard via a release film. A paper container with an outlet. 2. The paper container with a spout according to claim 1, wherein the release film has a multilayer structure. 3. The paper container with a spout according to claim 1, wherein a release film of a type that peels off at the interface with the innermost layer of the paperboard or the spout is used. 4. The paper container with a spout according to claim 1, wherein the release film is a film capable of delamination. 5. The paper container with a spout according to claim 1, wherein the release film is a type of film that peels off by cohesive failure.