JPH05635U - Paper container spout plug - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a spout stopper for a paper container capable of preventing oxidation of contents such as foods for a long period of time. [Structure] A spout spout attached to a paper container made of a laminated sheet containing aluminum foil, characterized by being made of an oxygen-absorbing composition containing a polyolefin and a metal compound.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 TECHNICAL FIELD The present invention relates to a spout stopper attached to an opening of a paper container.

[0002]

[Prior Art]

 Paper containers are widely used in sake, soft drinks, seasoning liquids, and other fields because they are not broken and are lighter than glass bottles. For contents that are particularly susceptible to oxidation and for long-term storage, a paper container with a laminated sheet structure laminated with aluminum foil is used as an oxygen barrier material. Such a paper container, especially a paper container having a large content volume, is generally equipped with a spout plug for the ease of opening the container and the convenience of pouring, and is particularly composed of a laminated sheet as described above. For paper containers, it has been proposed that the flange of the spout plug be made of a laminate containing aluminum foil.

[0003]

[Problems to be solved by the device]

 However, as described above, even if the paper container and the spout plug have a structure including aluminum foil, if the pull ring of the spout plug is pulled and once opened, oxygen will mix into the head space in the container. When the pull ring is pulled out, the aluminum layer of the spout plug is also pulled out, so oxygen permeates through the cap of the spout plug into the container. For this reason, there was a problem that when the contents that were easily oxidized such as cooking oil were stored in the opened state for a long period of time, the taste changes.

[0004] Therefore, an object of the present invention is to provide a spout for a paper container that can prevent the oxidation of the contents such as foods for a long period of time.

[0005]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention is a spout stopper attached to a paper container made of a laminated sheet containing aluminum foil, which is composed of an oxygen-absorbing composition containing polyolefin and a metal compound. Provided is a pouring spout for a paper container.

The present invention will be described in more detail below.

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

According to FIG. 1, a spout 1 of the present invention has a cap 3 and a pull ring 4, and is inserted into an opening of a paper container 5 in which a laminated sheet containing an aluminum foil 6 is boxed. The flange portion 2 of the outlet plug is heat-welded to the inner surface of the paper container by ultrasonic sealing or the like.

The spout plug can be formed by an injection molding method and is made of a composition containing polyolefin (PO) and a metal compound.

In addition to physically preventing the permeation of oxygen, PO is considered to have a role of binding to and absorbing oxygen by the action of a metal compound. As PO, not only homopolymers such as polyethylene, polypropylene, polybutene and polymethylpentene, but also copolymers of two or more monomers selected from olefins such as ethylene, propylene, butene and methylpentene are used.

The metal compound promotes the reaction between oxygen and PO. A transition metal is preferable as the metal constituting the metal compound. This is because it is presumed that the metal ion is involved in the reaction between oxygen and PO in the process of changing from the oxidized state to the reduced state and from the reduced state to the oxidized state. As such a transition metal element, Co, Fe, Cu, Ni, Mn, or the like can be used, and in addition, metals such as Al can be used. For example, Co is considered to combine oxygen and PO when changing from a trivalent Co ion to a divalent Co ion.

As the metal compound, a metal salt of an organic acid or an inorganic acid can be used. Preferred are salts of organic acids. This is because it can be presumed that the organic acid is decomposed by the heat generated when the spout plug is molded to generate a radical, which accelerates the reaction initiation of oxygen and PO.

As the organic acid, stearic acid, dimethyldithiocarbamic acid, linoleic acid, naphthenic acid and the like can be used.

The spout of the present invention may be made of a composition containing various other thermoplastic resins, and the metal element is 1.0 × 10 ⁻⁵ to 1.0 × with respect to 1 part by weight of PO. It can also be obtained by mixing a metal compound in an amount of 10 ⁻³ parts by weight and 0 to 500 parts by weight of another thermoplastic resin and injection molding.

[0015]

[Action]

 When the spout of the present invention is used, it is possible to absorb the oxygen in the head space mixed when the spout is opened, and also to absorb the oxygen that permeates the cap of the spout. Oxidation of the contents can be prevented for a long time after opening.

[0016]

【Example】

A composition obtained by mixing cobalt stearate (trivalent) in an amount of 2.0 × 10 ⁻⁴ parts by weight of cobalt element with 1 part by weight of polypropylene was injection-molded to produce a spout plug as shown in FIG. .. The weight of the spout plug is 7 g (excluding the weight of the cap), the flange diameter is 5 mm, and the flange thickness is 1.5 mm. This spout plug was inserted into the opening of a paper container made of a laminated sheet containing 12 μm aluminum foil, and the spout plug flange was fixed with an ultrasonic seal to obtain a paper container with a spout plug. The above box making process was performed in the atmosphere. The capacity of the paper container was 500 ml and was stored at 25 ° C, and the oxygen concentration in the container was measured.

The results are shown in Table 1.

[0018]

【effect】

 The spout of the present invention makes it possible to absorb the oxygen in the headspace mixed in when the spout is opened, and also to absorb the oxygen that permeates the cap of the spout. Can be prevented for a long period of time after opening. Further, the aluminum foil laminated on the flange portion of the spout plug is also unnecessary, so that the process can be simplified and the cost can be reduced.

Further, since a polyolefin resin that has been used conventionally can be used as a base material, there is no difficulty in moldability, and the thin-walled portion has good breakability when the pull ring is pulled.

[Brief description of drawings]

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

[Explanation of symbols]

 1 spout plug 2 flange part 3 cap 4 pull ring 5 paper container 6 aluminum foil

Claims (1)

[Claims for utility model registration] Claims: 1. A spout spout attached to a paper container made of a laminated sheet containing aluminum foil, comprising an oxygen-absorbing composition containing polyolefin and a metal compound. A spout for paper containers.