JP2001058666A - Pour-out port - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve gas barrier property of a pour-out port and prevent environmental problems from occurring. SOLUTION: This pour-out port employs, as a gas barrier film 2 placed on a rear face of the port 1, a film having a base material resin film including a thin layer of a metal, an inorganic oxide or a metal oxide formed by vapor deposition or sputtering on the surface. Excellent gas barrier property is exhibited by the film layer and also a much thinner layer than an aluminum foil or the like is used, thereby greatly reducing an amount of embers left.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to milk, juice,
The present invention relates to a spout attached to a paper container for accommodating alcohol or the like, and particularly to a spout provided with a film having high gas barrier properties.

[0002]

2. Description of the Related Art It has been widely practiced to attach a resin spout to a paper container. A typical example of this spout is a cylindrical nozzle, a shielding part for closing the bottom of the nozzle, a flange formed on the outer periphery of the bottom of the nozzle, and the shielding part easily opened. It was made of polyethylene having an opening groove formed in the shielding portion so as to be able to be provided, and a pull tab connected to a region of the shielding portion surrounded by the opening groove.

[0003] However, there is a problem that the spout made of polyethylene has a low gas barrier property. Therefore, in order to improve the gas barrier property of the spout, the spout has a configuration in which a gas barrier film such as PVDC, EVOH, MX nylon, or aluminum foil having a high gas barrier property is disposed on the back surface of the shielding part and the flange part of the polyethylene spout. Was developed,
(For example, see Japanese Utility Model Publication No. Hei 6-21858 and Japanese Utility Model Publication No. Hei 7-16592).

[0004]

However, PVDC and EVO used as gas barrier films
Although resin films such as H and MX nylon have high gas barrier properties among resin materials, they are considerably smaller than aluminum foil, and thus cannot always be said to exhibit satisfactory gas barrier properties. Moreover, among these resin materials, the one having the highest gas barrier property is PVDC.
C also has a problem that it may cause environmental problems because it contains chlorine. On the other hand, although aluminum foil has high gas barrier properties, there is a problem that even if it is incinerated after use, it remains unburned, and also requires a lot of energy at the time of manufacture, which is not environmentally desirable. Further, when the contents contained in the paper container are acidic, there is a problem that the aluminum foil is eluted by the contents.

[0005] The present invention has been made in view of such problems, and has as its object to provide a spout having high gas barrier properties without causing environmental problems.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned conventional problems, the present invention relates to a gas barrier film used for improving the gas barrier property of a spout, comprising metal or inorganic oxide formed on the surface by vapor deposition or sputtering. A material having a base resin film provided with a thin film layer of a material or a metal oxide. The gas barrier film of this configuration has a metal, inorganic oxide or metal oxide thin film layer formed by vapor deposition or sputtering on the surface of the base resin film, and is far superior to a resin gas barrier film conventionally used. Gas barrier properties,
For this reason, gas barrier properties are not required for the base resin film itself. Therefore, it is not necessary to use a resin containing chlorine (PVDC) which has been conventionally used as the base resin film. Excellent gas barrier properties can be exhibited during use. In addition, since the metal, inorganic oxide, or metal oxide thin film layer formed by evaporation or sputtering is extremely thin, almost no burning occurs even when incinerated, and this does not cause an environmental problem.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The spout of the present invention comprises a cylindrical nozzle portion, a shielding portion for closing a bottom portion of the nozzle portion, a flange portion formed on an outer periphery of a bottom portion of the nozzle portion, and a shielding portion. An opening groove formed in the shielding portion so as to be easily opened, a pull tab connected to a region surrounded by the opening groove of the shielding portion, and a gas barrier provided on the back surface of the shielding portion and the flange portion. In the spout provided with a film, the gas barrier film, a metal formed on the surface by vapor deposition or sputtering, having a configuration having a base resin film with a thin film layer of an inorganic oxide or metal oxide, I do. And, by using a gas barrier film having a thin film layer of a metal, an inorganic oxide or a metal oxide formed by vapor deposition or sputtering on the surface of a base resin film, it is much more than a conventional resin film such as a PVDC film. Excellent gas barrier properties (oxygen barrier properties are improved by 30 to 50%), and
Compared to a gas barrier film using aluminum foil, the amount of cinders generated during incineration can be significantly reduced, and excellent gas barrier properties can be exhibited without causing environmental problems.

Hereinafter, a more detailed description will be given with reference to the drawings. FIG. 1 is a schematic sectional view showing a spout according to an embodiment of the present invention, FIG. 2 is a schematic plan view thereof, and FIG. 3 is a schematic sectional view showing a part of the spout shown in FIG. The spout, which is generally designated by reference numeral 1, includes a cylindrical nozzle portion 1a, a flange portion 1b for attaching to a paper container, and a nozzle portion 1a.
Part 1c, which is closed, and an opening groove 1d, which is formed in a substantially circular shape so that the shielding part 1c can be opened by tearing it in a circular shape.
, A pull tab 1e connected to one end of a region surrounded by the opening groove 1d, and a gas barrier film 2 disposed on the back surface of the shielding portion 1c and the flange portion 1b.

The portion of the spout 1 other than the gas barrier film 2 is made of resin.
A polyolefin-based resin is used, and preferably, low-density polyethylene is used. The gas barrier film 2 is
As shown in FIG. 3 in an enlarged manner, it is attached so as to fit into a concave portion 3 formed on the back surface of the resin portion of the spout 1. This configuration is preferable because the gas barrier film 2 can be prevented from shifting or peeling.
Further, in the illustrated embodiment, the lower surface of the region surrounded by the opening groove 1d of the shielding portion 1c is the concave portion 4, and the gas barrier film 2 is bent at the bottom of the opening groove 1d. This configuration,
It is preferable because the gas barrier film 2 can be easily torn. The present invention is not limited to the case where the concave portions 3 and 4 are formed, and the concave portions 3 and / or the concave portions 4 may be omitted. For example, the back surface of the spout 1 (the back surface of the flange portion 1b and the shielding portion 1c) may be flattened, and the gas barrier film 2 may be attached to the flat surface.

Gas barrier film 2 provided at outlet 1
Has at least a base resin film provided with a thin film layer of a metal, an inorganic oxide or a metal oxide formed on the surface by vapor deposition or sputtering. Specifically, as shown in FIG. 4, a base resin film 12 having a thin film layer 11 formed on its surface, and a laminated film 2A having a resin layer 13 disposed on the thin film layer 11, or FIG.
As shown in FIG. 2B, a base resin film 12 having a thin film layer 11 formed on the surface thereof, a resin layer 13 disposed on the thin film layer 11, and a resin layer 14 disposed on the opposite side are provided. The laminated film 2B thus obtained can be suitably used as the gas barrier film 2. These laminated films 2A, 2A
B is the spout 1 on the side of the thin film layer 11 of the base resin film 12.
Is mounted so as to face the flange portion 2b and the shielding portion 2c.

Here, the base resin film 12 may be a resin film having a strength capable of forming a thin layer of metal, inorganic oxide or metal oxide on its surface by vapor deposition or sputtering. There is no need to prepare. For this reason, it is not necessary to use PVDC conventionally used as a material excellent in gas barrier as the base resin film 12, and a resin containing no element (for example, chlorine) causing an environmental problem is appropriately selected and used. it can. Specific examples of the base resin film 12 include various biaxially stretched resin films, and among them, a PET film, an ON (stretched nylon) film, an OPP (stretched polypropylene) film, and the like are preferable. If the thickness of the base resin film 12 becomes too thin, the strength becomes insufficient,
On the other hand, if the thickness is too large, it is difficult to break and the opening of the spout becomes difficult.
The thickness is set to about 30 μm, preferably 5 to 20 μm.

The thin film layer 11 formed on the surface of the base resin film 12 is formed to impart gas barrier properties, and is formed by depositing or sputtering metal, inorganic oxide or metal oxide. Formed by adhering to the surface of The metals used here include aluminum, titanium, tin, iron, gold, silver,
Copper, chromium, nickel, magnesium and the like can be mentioned, and metal oxides can be oxides of these metals. Among them, aluminum and alumina are preferred in terms of gas barrier properties and cost. Also,
Examples of the inorganic oxide include silicon oxide (SiO _x ). The thickness of the thin film layer 11 is usually 10 to 3
Set to about 00 nm, preferably 30 to 150 n
m. When the thickness is too thin, the gas barrier property is reduced. On the other hand, when the thickness is more than a certain level, the gas barrier property is not so much improved even if the thickness is increased more. Occurs, and the cost is undesirably high. The above range is preferable in consideration of these. These thin film layers 11
Has an oxygen barrier property improved by 30 to 50% as compared with conventionally used PVDC, and can exhibit excellent gas barrier properties.

The resin layer 13 provided on the thin film layer 11 is provided for improving the adhesiveness of the gas barrier film 2 to the resin portion of the spout 1, whereby
When the gas barrier film 2 is insert-molded, the gas barrier film 2 can be reliably integrated with the resin portion of the spout 1, and the gas barrier film 2 can be heat-sealed to the resin portion of the spout 1. Here, as the resin layer 13, from the viewpoint of ensuring good adhesion to the resin portion of the spout 1,
It is preferable to use the same resin as the resin part of the spout 1. As described above, since a polyolefin-based resin is often used as the resin forming the spout 1, a polyolefin-based resin is also used as the resin layer 13.
When polyethylene is used as the resin of the spout 1, it is preferable that the resin layer 13 be polyethylene.
The thickness of the resin layer 13 is usually selected to be about 10 to 30 μm, preferably about 20 μm.

When the laminated film 2A shown in FIG. 4A is used as the gas barrier film 2 in the spout 1,
The base resin film 12 is exposed in the container to which the spout 1 is attached. However, since the base resin film 12 is made of resin, deterioration, deterioration and the like hardly occur, and there is almost no occurrence of contamination of the contents or deterioration due to the contents, and there is no problem. Depending on the contents, there is a case where the base resin film 12 is required not to be exposed. The laminated film 2B shown in FIG. 4B is used in such a case. That is, in the laminated film 2B, the resin layer 14 disposed on the back surface of the base resin film 12 is disposed such that the base resin film 12 does not directly contact the contents of the container. Generally, in the paper container to which the spout 1 is attached, the inner surface of the container is usually made of a polyethylene layer, and depending on the contents of the container, it is required that the contents do not come into contact with anything other than the same resin as the polyethylene layer. There is. In such a case, polyethylene is used as the resin forming the spout 1 and polyethylene is used as the resin layer 14 of the laminated film 2B.
The exposed portion of the inner surface of the container including the spout 1 can be made entirely of polyethylene, so that the chance of the contents coming into contact with other substances can be eliminated. In addition, the material of the resin layer 14 is not limited to polyethylene, and can be appropriately changed according to the contents and the material of the resin layer on the inner surface of the paper container. Similarly to the resin layer 13, the thickness of the resin layer 14 is generally selected to be about 10 to 30 μm, preferably about 20 μm.

Next, a method of manufacturing and using the spout 1 having the above configuration will be described. The method for manufacturing the spout 1 may be a method in which a resin portion is manufactured in advance by injection molding, and then the gas barrier film 2 is manufactured by attaching the gas barrier film 2 to the molded body by heat sealing or the like. Alternatively, the gas barrier film 2 may be set in a mold having a space having the same shape, and then a molten resin may be injected to form a spout 1 in which the gas barrier film 2 is integrally embedded, thereby manufacturing by insert molding. Among these manufacturing methods, the method using insert molding is preferable because the advantage that the spout 1 in which the gas barrier film 2 is surely integrated at a predetermined position can be manufactured with high productivity is obtained.

The spout 1 is made of a paper container 20 (see FIGS. 1 and 3) in the same manner as a conventional spout described in Japanese Utility Model Publication No. Hei 6-21858 and Japanese Utility Model Publication No. Hei 7-16592. Used to be attached to. As the paper container 20 to which the spout 1 is attached, a container having a high gas barrier property is used. As the base material constituting the paper container 20, it is preferable to use a material that exhibits high gas barrier properties and does not cause environmental problems. For this reason, as shown in FIG. 3, the gas barrier film 2 is formed on the inner surface of the paper layer 20a.
It is preferable to use a gas barrier film 20b having the same configuration as described above, and a resin layer 20c and 20d for adhesion laminated on the entire front and back surfaces. In the paper container 20 provided with the spout 1 of the present embodiment, as can be clearly understood from FIGS. 1 and 3, the gas barrier film 2 provided in the spout 1 not only covers the shielding portion 1 c of the spout 1, It is also located on the lower surface of the outer flange portion 1b and overlaps the paper container 20 having high gas barrier properties. For this reason, the entire surface of the paper container 20 including the attachment portion of the spout 1 is covered with the film having high gas barrier properties, and the excellent gas barrier properties of the entire paper container can be exhibited. When opening,
As in the case of the conventional spout, pulling the pull tab 1e tears off the shielding portion 1c and the gas barrier film 2 along the opening groove 1d, so that the gas barrier film 2 can be opened.

In the embodiment shown in the drawings, as can be clearly understood from FIG. 3, the resin portion is left at the bottom of the opening groove 1d, and the gas barrier film 2 is joined under the resin portion. The present invention is not limited to this configuration,
The bottom of the opening groove 1d may be formed with the gas barrier film 2 without leaving the resin portion at the bottom of the opening groove 1d. With this configuration, opening can be further facilitated. The spout of this configuration can be manufactured by insert molding using a mold having a configuration in which resin can be injected into both sides of the opening groove 1d.

[0018]

As described above, the spout of the present invention is a gas barrier film having a base resin film provided with a thin film layer of metal, inorganic oxide or metal oxide formed on the surface by vapor deposition or sputtering. By using
Compared to conventional resin-made gas barrier films, it can demonstrate much better gas barrier properties, and can reduce the amount of incineration caused by incineration compared to gas barrier films with aluminum foil, without causing environmental problems. This has the effect of exhibiting improved gas barrier properties.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a spout according to an embodiment of the present invention.

FIG. 2 is a schematic plan view of the spout shown in FIG.

FIG. 3 is a schematic sectional view showing a part of the spout shown in FIG. 1 in an enlarged manner.

4A and 4B are schematic cross-sectional views each showing a configuration of a laminated film that can be used as a gas barrier film at the spout shown in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Spout 1a Nozzle part 1b Flange part 1c Shield part 1d Opening groove 1e Pull tab 2 Gas barrier film 2A, 2B Laminated film (gas barrier film) 3, 4 Depression 11 Thin film layer 12 Base resin film 13, 14 Resin layer 20 Paper container

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Tatsuya Nozaki 1-1-1, Ichigaya-Kagacho, Shinjuku-ku, Tokyo Inside Dai Nippon Printing Co., Ltd. (72) Inventor Kenichi Endo 1-chome, Ichigaya-cho, Shinjuku-ku, Tokyo No. 1 Dai Nippon Printing Co., Ltd. F-term (reference) 3E084 AA05 AA12 AA34 AB01 BA03 CA01 CB01 CB02 CB04 CC03 CC08 DB12 DC03 EA01 EB01 EB02 EB04 EC09 FA09 FB02 FD13 GA01 GB01 GB08 GB12 GB13 GB17 HA01 HB15 HC03 HD01 LA LB02

Claims (4)

[Claims] 1. A cylindrical nozzle part, a shielding part for closing a bottom part of the nozzle part, a flange part formed on an outer periphery of a bottom part of the nozzle part, and the shielding part so that the shielding part can be easily opened. An opening groove formed in the portion, a pull tab connected to a region surrounded by the opening groove of the shielding portion, and a spout provided with a gas barrier film provided on the back surface of the shielding portion and the flange portion. An outlet, wherein the gas barrier film has a base resin film provided with a thin film layer of a metal, an inorganic oxide or a metal oxide formed on the surface by vapor deposition or sputtering. 2. A portion of the spout except for a gas barrier film is formed of a polyolefin-based resin, and the gas barrier film is a polyolefin forming a spout on a thin film layer on a surface of the base resin film. 2. The spout according to claim 1, wherein the spout is formed of a laminated film having a polyolefin resin layer of the same quality as the resin. 3. The method according to claim 1, wherein the base resin film is PET, ON,
Or an OPP.
Or the spout described in 2. 4. The spout according to claim 1, wherein the gas barrier film is integrated with the spout by insert molding.