JP2013086856A - Oxygen absorbing cap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oxygen absorbing cap which is given oxygen absorbing performance, and can be visually confirmed whether oxygen is absorbed.SOLUTION: This oxygen absorbing cap 1 mounted and fixed to a mouth part of a container body 2 is composed by including 90-99 wt.% of a base material resin, and 1-10 wt.% of titanium oxide having oxygen loss, and discolors by absorbing oxygen.

Description

  The present invention relates to an oxygen absorbing cap that is attached and fixed to the mouth of a container body that contains contents such as dressing and dripping.

  If the container body is filled with the contents and the container body is left for a long time, oxygen permeates into the container body and the contents are oxidized and deteriorated. For this reason, in recent years, container bodies having oxygen absorption performance have been developed in order to prevent oxidative deterioration of the contents.

  The cap that is attached and fixed to the mouth of the container main body is mainly formed of a polyolefin resin such as polyethylene (PE) or polypropylene (PP). However, since polyolefin resin does not have oxygen absorption performance, it cannot prevent oxygen from entering the container body from the cap. As a result, the contents are oxidized and deteriorated by oxygen that has entered the container body from the cap. For this reason, it is necessary to provide the cap with oxygen absorption performance to prevent oxygen from entering the container body from the cap.

  Note that Patent Document 1 uses an oxygen-absorbing laminated material having a laminated structure including an oxygen-absorbing layer to which titanium oxide having oxygen vacancies is added as a cover material for a package to improve oxygen absorption performance. The point to be disclosed is disclosed.

JP 2006-95832 A

  The oxygen absorption layer disclosed in Patent Document 1 absorbs oxygen when titanium oxide having oxygen deficiency added to the oxygen absorption layer is combined with oxygen. However, since there is a limit to the amount of titanium oxide having oxygen vacancies added to the oxygen absorbing layer, the amount and period during which oxygen can be absorbed is also limited. That is, the oxygen absorption capacity of the oxygen absorption layer has a lifetime. In addition, since the cover material currently disclosed by the said patent document 1 is comprised using said oxygen absorption layer, it can absorb oxygen. However, even if the lid material of Patent Document 1 absorbs oxygen, it cannot be visually confirmed whether or not the lid material has absorbed oxygen. As a result, with the lid material of Patent Document 1, it is impossible to visually grasp the lifetime of the oxygen absorption capacity of the lid material.

  This invention is made | formed in view of the said situation, While providing oxygen absorption performance, it aims at providing the oxygen absorption cap which can confirm visually whether oxygen was absorbed or not. .

  In order to achieve this object, the present invention has the following features.

  An oxygen absorption cap according to the present invention is an oxygen absorption cap that is attached and fixed to the mouth of a container body, and includes 90 to 99% by weight of a base resin and 1 to 10% by weight of titanium oxide having oxygen deficiency. It is configured to absorb oxygen and change color.

  According to the present invention, it is possible to visually confirm whether or not oxygen is absorbed and whether oxygen is absorbed.

It is a figure which shows the structural example of the container of this embodiment. It is the state which opened the upper cover of the oxygen absorption cap of this embodiment, (a) is a top view, (b) is sectional drawing.

<Configuration example of container 100>
First, the container 100 of this embodiment is demonstrated, referring FIG.
The container 100 of this embodiment includes an oxygen absorption cap 1 and a container body 2.

  The oxygen absorption cap 1 includes a base resin and titanium oxide having oxygen deficiency, and is attached and fixed to the mouth of the container body 2.

  The container main body 2 accommodates contents such as oil and dressing. The material which comprises the container main body 2 is not specifically limited, A well-known material is applicable. Moreover, the container main body 2 can be comprised with a single layer structure or a multilayer structure. In addition, when giving the container main body 2 gas barrier property, it is preferable to comprise by gas barrier resin. Examples of the gas barrier resin include polyester, polyamide, polyacrylonitrile, polyvinyl alcohol, ethylene-vinyl alcohol copolymer, and polyvinylidene chloride.

<Configuration example of oxygen absorbing cap 1>
Next, a configuration example of the oxygen absorption cap 1 of the present embodiment will be described with reference to FIG. FIG. 2 shows a configuration example of the pull open cap.
The oxygen absorption cap 1 of this embodiment includes a cap body 3 that is attached and fixed to the mouth of the container body 2, and an upper lid 4 that is connected to the cap body 3 via a hinge portion 3a. The cap body 3 includes an outer cylinder part 9 and an inner cylinder part 10, and has a top wall 5 that seals the mouth of the container body 2 inside the inner cylinder part 10. A thin weakened portion 6 is formed in the top wall 5 to form a dispensing opening. When the oxygen absorption cap 1 of the present embodiment is constituted by the pull open cap shown in FIG. 2, the oxygen absorption cap 1 is attached and fixed to the mouth portion of the container body 2 by a stopper. At that time, the inner cylinder portion 10 of the cap body 3 is press-fitted into the mouth portion of the container body 2 (not shown).

  The weakening portion 6 is provided on the top surface wall 5, extends on the top surface wall 5, and defines a planned opening portion 7. A pull ring 8, which is an example of a tearing means for the planned opening portion 7, is integrally provided on the surface of the planned opening portion 7 so that the outer wall of the column portion is continuous with the weakened portion 6. The weakened portion 6 is torn off so that the planned opening portion 7 can be removed.

  The oxygen absorption cap 1 of this embodiment includes a base resin and titanium oxide having oxygen vacancies.

  As the base resin, it is possible to use polyolefin resins such as low density polyethylene, medium density polyethylene, high density polyethylene, linear low density polyethylene, linear ultra low density polyethylene, polypropylene, and propylene-ethylene copolymer. preferable. In addition, thermoplastic elastomers such as styrene-butadiene-styrene block copolymers and styrene-ethylene-butylene-styrene block copolymers can also be used.

  As the titanium oxide having oxygen deficiency, it is preferable to use a crystal form such as rutile or brookite, an amorphous form, a crystal form of anatase, or the like. Titanium oxide having oxygen vacancies can be easily kneaded into the base resin. Also, there is no risk of sparking or ignition even when heated in a microwave oven. Moreover, since it whitens when oxygen is absorbed, it has an indicator function. Further, when there is moisture without reacting with the metal inspection machine, oxygen absorption is promoted, and oxygen absorption performance at low humidity is high as compared with iron-based.

  The oxygen absorption cap 1 of this embodiment preferably includes 90 to 99% by weight of the base resin and 1 to 10% by weight of titanium oxide having oxygen deficiency. When the titanium oxide is less than 1% by weight, the oxygen absorption performance of the oxygen absorption cap 1 is lowered, and even if the oxygen absorption cap 1 absorbs oxygen, the oxygen absorption cap 1 does not change color, and the oxygen absorption cap 1 is oxygen. This is because it is impossible to visually confirm whether or not the water is absorbed. Moreover, when there is more titanium oxide than 10 weight%, it is because the intensity | strength as a cap cannot be maintained but the tolerance of a cap falls. For this reason, it is preferable that the oxygen absorption cap 1 includes titanium oxide having oxygen deficiency in the range of 1 to 10% by weight.

  As described above, since the oxygen absorption cap 1 of the present embodiment includes 1 to 10% by weight of titanium oxide having oxygen vacancies, the oxygen absorption cap 1 itself has oxygen absorption performance. Oxygen intrusion into the container body 2 can be prevented.

  Note that the container 100 of the present embodiment opens the upper lid 4 of the oxygen absorption cap 1 when the contents flow out from the container body 2, and closes the upper lid 4 after the contents flow out to the outside. . For this reason, when the upper lid 4 is closed, oxygen in the air enters between the contents in the container body 2 and the oxygen absorption cap 1. However, since the oxygen absorption cap 1 of this embodiment has oxygen absorption performance, it can absorb oxygen and prevent oxidative deterioration of the contents. Further, when oxygen is absorbed, the oxygen absorption cap 1 itself is discolored, so it can be visually confirmed whether or not the oxygen absorption cap 1 has absorbed oxygen. As a result, the lifetime of the oxygen absorption capacity of the oxygen absorption cap 1 can be grasped visually.

  Next, examples of the oxygen absorption cap 1 of the present embodiment will be described. In addition, the Example shown below is an example and the oxygen absorption cap 1 of this embodiment is not limited to the following Example.

Example 1
In Example 1, polyethylene (PE) was used as the base resin constituting the oxygen absorption cap 1.

  First, a master batch (a mixing ratio of LDPE and TiOx is LDPE: TiOx = 7: 3) composed of titanium oxide having oxygen deficiency (TiOx (x is a value less than 2)) and low-density polyethylene (LDPE) is used. 2 is mixed with PE to form a mixed resin in which the mixing ratio of PE, LDPE, and TiOx is PE: LDPE: TiOx = 90: 7: 3, and oxygen absorption shown in FIG. 2 is performed using the mixed resin. Cap 1 was formed by injection molding.

  When the oxygen absorption capacity of the oxygen absorption cap 1 containing 3% by weight of titanium oxide having oxygen vacancies was measured, the oxygen absorption capacity was 22.6 cc / g. The oxygen absorption capacity was measured by the following method.

  A part of the molded oxygen absorption cap 1 was used as a test piece, and the test piece was put into a 260 ml bottle together with 50 mg of water, sealed with a lid, and allowed to stand at 55 ° C. for 5 days. The oxygen absorption performance of was measured by gas chromatography (GC). The test piece left for 5 days turned white and discolored. For this reason, it was able to confirm visually that the oxygen absorption cap 1 absorbed oxygen.

(Example 2)
In Example 2, polypropylene (PP) was used as the base resin constituting the oxygen absorption cap 1. The rest is the same as in the first embodiment.

  When the oxygen absorption capacity of the oxygen absorption cap 1 of Example 2 was measured, the oxygen absorption capacity was 22.6 cc / g as in Example 1. The method for measuring the oxygen absorption capacity is the same as in Example 1. The oxygen absorption cap 1 of Example 2 was also whitened and discolored in the same manner as Example 1. For this reason, it was able to confirm visually that the oxygen absorption cap 1 absorbed oxygen.

  The above-described embodiments and examples are preferred embodiments and examples of the present invention, and the scope of the present invention is not limited only to the above-described embodiments and examples, and does not depart from the gist of the present invention. Implementation in a form in which various changes are made in the range is possible.

  For example, in the present embodiment, the pull-open cap shown in FIG. 2 has been described as an example of the oxygen absorption cap 1, but the oxygen-absorbing cap 1 is not limited to the pull-open cap shown in FIG. It is also possible to do.

100 Container 1 Oxygen absorption cap 2 Container body 3 Cap body 4 Upper lid

Claims (3)

An oxygen absorption cap that is attached and fixed to the mouth of the container body,
An oxygen-absorbing cap comprising 90 to 99% by weight of a base resin and 1 to 10% by weight of titanium oxide having oxygen deficiency, which absorbs oxygen and changes color.   2. The oxygen absorbing cap according to claim 1, wherein the base resin is a polyolefin resin.   3. The oxygen absorbing cap according to claim 1, wherein the oxygen absorbing cap is a pull-open cap.

Images