JPH0536845Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Industrial Application Field] The present invention relates to a cap containing an oxygen scavenger. More specifically, it is a cap for sealing the mouth of a container, which has a hollow part and is fixed with a molded body that is impermeable to liquid but gas permeable.
This is an idea related to a cap containing an oxygen absorber. Confectionery, fruits and vegetables, luxury goods, alcoholic beverages, soy sauce, nutritional drinks, photographic developers, etc. contain nutrients and reducing substances from microorganisms, and oxygen is present in the air, so they are susceptible to spoilage by microorganisms. Alternatively, deterioration, discoloration due to oxidation of reducing substances, or a decrease in functionality may occur. These phenomena can be prevented by removing oxygen from the system, but the present invention provides a cap containing an oxygen scavenger for use in preserving various substances, especially liquid or semi-liquid substances. It is related to. [Prior Art] Conventionally, the following methods are known for preserving various liquid substances including foods. For alcoholic beverages, the temperature is set to 60 to 80 degrees before filling the container.
The effect has been improved by raising the temperature to ℃ and killing microorganisms (sterilization method). However, this method had the disadvantage that the taste of the sake changed. In the preservation of liquid or semi-liquid foods and other substances, replacing the air in closed containers with nitrogen has been adopted, but this method has the disadvantage that oxygen permeating through the walls of the container cannot be removed. Furthermore, it is difficult to reduce the oxygen concentration to 0.1% or less for cost reasons, and the preservation effect of this method has a practical limit. A method of adding a preservative to the liquid has also been adopted, but the reality is that this method may alter the taste or have various effects on the human body in terms of health and safety. [Problems to be solved by the invention] Recently, as the most effective method of preserving food, a method of placing food in a sealed container and applying an oxygen absorber has been attracting attention. However, conventional oxygen absorbers are used by filling small bags made of breathable packaging materials such as paper or nonwoven fabric with powder that reacts with oxygen. When applied to containers containing substances, the following problems arise. (1) Some of the ingredients in the oxygen scavenger may dissolve into the liquid or semi-liquid that is being stored, resulting in coloring of the material to be stored or a change in taste or odor. be. (2) Packaging materials filled with oxygen scavengers become wet with liquid or semi-liquid substances and oxygen absorption stops. (3) It is often difficult to include oxygen scavengers in small spaces. As a result of various studies to solve the above problems, the present inventors fixed a molded body with a hollow part in the structure of the cap and had a certain gas permeability, and deoxidized it inside it. The present invention was completed based on the discovery that by storing the deoxidizing agent, oxygen can be effectively removed and that the components of the deoxidizing agent do not migrate into the liquid or semi-liquid substance to be stored. [Means for solving the problem] That is, the present invention is a cap for sealing the mouth of a container, which has a hollow part, does not allow liquid to pass through, and has an oxygen permeability coefficient (P) of 5 at 25°C. ×
A molded body having a gas permeability of 10 ^-10 cm ³ (STP) cm/cm ² sec cmHg or more is fixed to the side of the cap facing the container, and an oxygen scavenger is stored in the hollow part of the molded body, This cap is capable of absorbing oxygen within the container through the molded body. The molded body used in this invention is impermeable to liquid and has an oxygen permeability coefficient (P) of 5× at 25°C.
The molded article has a gas permeability of 10 ^-10 cm ³ (STP) cm/cm ² sec cmHg or more. Examples of the resin or polymer used in the molded article of the present invention include silicone resins such as polydimethylsiloxane, polyphenylene oxide resins such as poly2,6-dimethylphenylene oxide,
Examples include synthetic rubber such as polymethylpentene and polybutadiene, and natural rubber. These may be used in combination with other resins or in copolymerization with other resins. Molding is achieved by extrusion molding, heating vacuum forming or hot press forming of the sheet. The thickness of the molded body used in the present invention is 10 μm or more and 2 mm or less, preferably 10 μm or more and 1 mm or less at its thinnest part. As shown in the drawings, the cap of the present invention utilizes the shape of a conventional screw cap or crown for sake bottles as is. 1 to 5 are sectional views of an example applied to a screw cap, and FIGS. 6 and 7 are sectional views of an example applied to a crown for a sake bottle. The molded body 2 may be attached to the cap body 1 as shown in Fig. 1, and an oxygen absorber 3 may be placed inside to seal the cap body 1 and the opening 4 of the container body, but the airtightness can be improved. Therefore, as shown in Fig. 2, Fig. 3, or Fig. 5, an elastic sealing material 5 is inserted between the molded body 2 and the mouth part 4 of the container body, or as shown in Fig. 5 or Fig. It is also a preferred embodiment to insert a sheet or film 6 between the molded body 2 and the molded body 2. The cap body 1 is made of metal such as iron or aluminum, or various molded plastics. The elastic sealing material 5 may be a ring-shaped sheet made of polyethylene, polypropylene, polystyrene, etc. or a foamed sheet, or SBR,
Sealing materials such as natural rubber and polyvinyl chloride are used. Although crimping may be sufficient for fixing the cap body 1 and the molded body 2 and the molded body 2 and the elastic sealing material 5, an appropriate adhesive may be used as necessary. In particular, the embodiment shown in FIG. 4 is an example in which the cap body 1 and the molded body 2 are fixed with an adhesive, and the airtightness between the cap body 1 and the opening 4 of the container body is achieved by an elastic sealing material 5. . The oxygen permeability of the sheet or film 6 in the present invention is preferably 100 ml/m ² Datm or less, and 50
Particularly preferred is ml/m ² Datm or less. Film types include nylon, polyester, polypropylene,
Sheets or films of polyethylene, polyvinyl chloride, etc., low-foamed products thereof, composite films of these as base materials, sheets or films coated with polyvinylidene chloride, and/or aluminum foil, A sheet or film coated with aluminum is used. The oxygen scavengers used in this invention include metal powders including iron powders, ferrous salts such as ferrous sulfate and ferrous chloride, reducing sulfur compounds such as dithionite, ascorbic acid, and/or or its salt, erythorbic acid and/or its salt, catechol, a reducing organic compound such as hydroquinone, etc. are used as the main ingredient. Among these, oxygen scavengers using iron powder, ascorbic acid and/or its salts, and erythorbic acid and/or its salts as main ingredients are particularly preferred. The shape of the oxygen scavenger used in this invention is as follows:
For example, in addition to powder, granular, spherical, or tablet-shaped products, or those stored in air-permeable containers such as blister packaging, etc., can be used. In particular, a tablet-shaped oxygen absorber is preferred from the viewpoint of ease of manufacturing the cap of the present invention. [Example] A polymethylpentene film with a thickness of 0.2 mm is heated and vacuum formed to have a brim diameter of 28 mm as shown in 2 in Fig. 5.
A molded body with a bottom diameter of 18 mm and a height of 6 mm was obtained. A tablet molded product (12 mm in diameter and 3 mm thick) containing an oxygen absorbing composition containing iron as a main ingredient is placed in the concave part of this molded product.
3 and the upper brim part is polyvinylidene chloride coated stretched nylon/polyethylene/polytrimethylbentene (TPX, manufactured by Mitsui Petrochemical Co., Ltd.) with a thickness of 0.2 m.
The films 6 were combined and heat-sealed to obtain an oxygen absorber storage body. Furthermore, as shown in Fig. 5, the oxygen scavenger storage body is placed in an aluminum screw cap 1, and a ring 5 made of polyethylene foam with a thickness of 1 mm (foaming ratio: 2 times) is inserted into the lower surface of the brim. It was loaded into a bottle containing 300ml of sake and sealed. This at 25℃
After 6 months, the gas inside the bottle was collected from the cap using a gas sampler, and the oxygen concentration was analyzed using gas chromatography.The bottle was opened and the sake was tested for quality. The results are shown in Table 1. A test similar to the above example was conducted except that the screw cap was not loaded with an oxygen scavenger. The results are shown in Table 1 as a comparative example together with the examples.

[Functions and effects of invention]

When the cap of the present invention is applied to a container and used to prevent deterioration of a liquid or semi-liquid substance, the liquid-soluble components generated when the oxygen scavenger absorbs oxygen are transferred to the liquid or semi-liquid substance to be stored. Since migration is prevented, the stored items in the container are not contaminated at all, and oxygen is effectively removed and the quality of the liquid is suitably maintained. In addition, especially in the case where the upper part of the cap of the present invention is covered with a film with low air permeability, the infiltration of oxygen from the outside is extremely reduced, and the quality inside the sealed container is effectively maintained without impairing the effectiveness of the oxygen scavenger composition. It is possible to hold the The object to be preserved according to the present invention is not particularly limited to liquids, but can be suitably used in any form of slurry, jelly, sol, or solid having high water activity.

[Brief explanation of the drawing]

The drawings (FIGS. 1 to 7) are cross-sectional views of the cap. DESCRIPTION OF SYMBOLS 1... Cap body, 2... Molded object, 3... Oxygen absorber, 4... Mouth of container body, 5... Elastic sealing material, 6... Sheet or film.

Claims (1)

[Scope of utility model registration request] A cap for sealing the mouth of a container, which is made of a material selected from silicone resin, polyphenylene oxide resin, polymethylpentene, and polybutadiene, has a hollow part, is impermeable to liquid, and is made of a material selected from silicone resin, polyphenylene oxide resin, polymethylpentene, and polybutadiene. Oxygen permeability coefficient (P) is 5
×10 ^-10 cm ³ (STP) cm/cm ² sec A molded body having a gas permeability of at least cmHg is fixed to the side of the cap facing the container, and an oxygen scavenger is stored in the hollow part of the molded body. , a cap capable of absorbing oxygen within the container through the molded body.