JP2020117304A - Container, and method for improving hydrogen holding property of container - Google Patents

Abstract

To provide a container for storing a content containing hydrogen such as hydrogen water exhibiting not only an excellent sealing property but also a high hydrogen holding property.SOLUTION: According to the present invention, a container 10 for storing a content containing hydrogen comprises: a container body 1 having a mouth 11 as an inlet/outlet of the content; an inner cap 2 attached to an end edge part of the mouth 11 so as to seal the mouth 11; and an outer cap 3 screwed to the mouth 11 to which the inner cap 2 is attached.SELECTED DRAWING: Figure 2

Description

The present invention relates to containers, and more particularly to containers for containing hydrogen-containing contents.

In recent years, the demand for drinking water containing hydrogen gas, so-called hydrogen water, has increased, and various companies have provided hydrogen water products packaged with hydrogen water filled in bottle cans, aluminum pouches, and the like. Generally, hydrogen water refers to water in which hydrogen molecules (hydrogen gas) are dissolved by 1 ppm or more. However, according to the Molecular Hydrogen Medical Study Group, hydrogen containing 0.2 ppm (200 ppb) or more of hydrogen is hydrogen. It is defined as water.

As the container for storing the hydrogen water as described above, a metal container, particularly an aluminum container is preferably used. The aluminum material has a higher hydrogen retention property than the plastic material, and the permeation of hydrogen gas from the wall surface of the container can be extremely reduced.

The aluminum container used to store hydrogen water has a high hydrogen retention property, but it does not contain sufficient hydrogen under long-term storage beyond the expiration date or in harsh environments such as high temperature and high pressure. Maintainability may be difficult to maintain. And because of the structure of the container mainly composed of the container body and the cap that seals the mouth of the container, the degree of sealing of the cap with respect to the container body greatly affects the hydrogen retention of the hydrogen water as the content. It is becoming important to ensure the sealing performance of the cap with respect to the container body when the container is closed. In fact, it has been found that hydrogen easily leaks from a slight gap between the mouth of the container body and the cap.

In order to reduce the gap between the cap of the aluminum container body and the cap, there is a method of thinning the liner material adhered to the inside of the top plate of the cap. However, if the liner material is made thin, there is a problem that the buffering property between the cap and the container main body is lowered, so that it becomes weak against impact, and further, the unsealing property is lowered, so that there is a problem that it becomes difficult to open the cap.

The present invention has been made based on the above-mentioned circumstances, and an object thereof is to provide a container for accommodating a content containing hydrogen such as hydrogen water having excellent sealing performance and high hydrogen retention. ..

In order to solve the above-mentioned problems, firstly, the present invention is a container for accommodating a content containing hydrogen, the container main body having a mouth part that serves as an entrance and exit of the contents, and the mouth part is sealed. Thus, there is provided a container including an inner cap that is capped on an edge portion of the mouth portion, and an outer cap that is screwed into the mouth portion that is capped with the inner cap (invention 1).

According to this invention (Invention 1), the mouth of the container body is sealed with the inner cap, and the mouth capped with the inner cap is further sealed by screwing with the outer cap. It is possible to suppress the release of hydrogen from the mouth.

In the said invention (invention 1), it is preferable that the said inner cap is an aluminum foil attached to the edge part of the said opening part (invention 2).

According to this invention (Invention 2), the inner cap is an aluminum foil having a higher hydrogen retaining property than a plastic material, so that it is possible to further suppress release of hydrogen from the mouth of the container body. ..

In the said invention (invention 1 and 2), it is preferable that the said outer cap is provided with the liner material fitted in the edge part of the said opening part (invention 3).

Here, the "liner material" in the present invention means a flexible member provided around the inner side of the top plate portion of the outer cap so as to be fitted to the end edge portion of the mouth portion of the container body.

According to this invention (Invention 3), since the liner material provided around the inner side of the top plate portion of the outer cap fits into the edge portion of the mouth portion of the container body, the hermeticity of the outer cap with respect to the container body is ensured. Therefore, high hydrogen retention can be realized.

In the said invention (invention 3), it is preferable that the said liner material has a fitting groove with which the edge part of the said opening part fits (invention 4).

According to the invention (Invention 4), the liner material has the fitting groove into which the edge portion of the mouth portion of the container body is fitted, so that the sealing performance of the outer cap with respect to the container body is further improved.

In the said invention (invention 4), it is preferable that the outer peripheral wall of the said fitting groove is formed higher than an inner peripheral wall (invention 5).

According to this invention (Invention 5), since the outer wall of the fitting groove of the liner member is formed higher than the inner wall, the sealing performance of the outer cap with respect to the container body is further improved. In addition, when the mouth portion coated with aluminum foil as the inner cap is further sealed with the outer cap, the aluminum foil crowned along the edge of the mouth portion of the container body is Since the outer wall presses the inner edge in the radial direction of the edge portion of the mouth portion, the sealing property of the aluminum foil with respect to the container body is further improved.

Secondly, the present invention is a method for improving the hydrogen retaining property of a container containing a content containing hydrogen, wherein the mouth of the container body, which serves as an entrance and exit of the content, is sealed, Provided is a method for improving hydrogen retention of a container, which comprises a step of capping an inner cap on an edge portion of a mouth part and a step of screwing an outer cap on the mouth part to which the inner cap is capped ( Invention 6).

According to this invention (invention 6), the mouth of the container body is sealed with the inner cap, and the mouth capped with the inner cap is further sealed by screwing with the outer cap. The release of hydrogen from the mouth can be suppressed, and the hydrogen retention of the container is improved.

According to the container of the present invention, the mouth of the container body is sealed with the inner cap, and the mouth capped with the inner cap is further sealed by screwing with the outer cap. It is possible to suppress the release of hydrogen from the hydrogen.

It is a schematic diagram which shows the container which concerns on one Embodiment of this invention, (a) is a side view of the whole container, (b) is a bottom view of the outer cap in the state which applied the liner material, (c) is an inner It is a bottom view of a cap. FIG. 2 is a partially enlarged sectional view taken along the line AA of FIG. 1.

Hereinafter, embodiments of the container of the present invention will be described with reference to the drawings as appropriate. The embodiments described below are for facilitating the understanding of the present invention and do not limit the present invention in any way.

〔container〕
FIG. 1 is a schematic view showing a container 10 according to an embodiment of the present invention, and FIG. 2 is a partially enlarged sectional view taken along the line AA of FIG. The container 10 is a container for containing the content containing hydrogen, and is attached to the container body 1 having the mouth portion 11 and the end edge portion of the mouth portion 11 so as to seal the mouth portion 11. An inner cap 2 and an outer cap 3 that is screwed into a mouth portion 11 to which the inner cap 2 is attached are provided.

In the present embodiment, the inner cap 2 is an aluminum foil 21 attached to the end edge of the mouth 11, as shown in FIG. Also. In the present embodiment, the outer cap 3 includes a liner material 4 that fits into the edge of the mouth 11.

[Container body]
The container body 1 is for accommodating contents containing hydrogen such as hydrogen water. The content is not limited to a liquid, and may be, for example, a jelly food containing hydrogen. The container body 1 has a mouth portion 11 serving as an entrance and exit for contents, and a screw groove 111 is formed in the mouth portion 11 in advance. The shape of the container body 1 is not particularly limited as long as it can accommodate the contents, and may be, for example, a bottle shape or a pouch shape. As for the mouth portion 11, a part of the container body 1 may be formed as the mouth portion 11 as in the present embodiment, or another member may be attached to the container body 1 to form the mouth portion 11. As the material of the container body 1, for example, a resin such as a polyolefin resin or a polystyrene resin, or a metal such as aluminum or an aluminum alloy can be used, but since it has a high hydrogen retaining property, it is an aluminum material or a material partially containing aluminum. It is preferable to have.

[Inner cap]
In this embodiment, as shown in FIG. 2, the inner cap 2 is an aluminum foil 21 that is attached to the edge of the mouth 11 so as to seal the mouth 11. Since the aluminum material has a higher hydrogen retaining property than the plastic material, the inner cap 2 made of the aluminum foil 21 can more effectively suppress the release of hydrogen from the opening 11 of the container body 1. it can.

The size of the aluminum foil 21 is not particularly limited as long as it has an outer diameter larger than the outer diameter of the mouth 11 so that the mouth 11 of the container body 1 can be sealed. However, in consideration of hermeticity, it is preferable that the length of the skirt portion 211 bonded to the vertical portion of the outer wall of the mouth portion 11 is about 2 to 3 mm. The thickness of the aluminum foil 21 is not particularly limited as long as the mouth 11 of the container body 1 can be sealed, but considering the fact that it is hard to tear and easy to peel off, it is about 0.1 mm. It is preferable to have. The aluminum foil 21 may be provided with a tab portion serving as a handle so that the aluminum foil 21 can be easily grasped and peeled off. As the aluminum foil 21, for example, a well-known cover material with an adhesive seal can be preferably used.

[Outer cap]
As shown in FIGS. 1 and 2, the outer cap 3 has a bottomed cylindrical shape as a whole, and can seal the mouth 11 of the container body 1 by screwing, and the top plate 31 and the top plate. The tubular portion 32 hangs from the peripheral edge of the portion 31. As the outer cap 3, for example, one molded from a resin such as polyolefin resin or polystyrene resin, or one processed from a metal plate such as aluminum or aluminum alloy can be used. Are preferred. As shown in FIG. 2, the outer cap 3 of the present embodiment includes a liner material 4 provided around the inside of the top plate portion 31.

[Liner material]
The “liner material” means a flexible member that is provided around the inside of the top plate portion 31 of the outer cap 3 so as to be fitted to the edge portion of the mouth portion 11 of the container body 1, and is usually a synthetic material. Resin is used. As the synthetic resin for the liner material, for example, an olefin resin, a vinyl chloride resin or the like can be used, but a mixed resin of an olefin resin and another elastomer is preferable from the viewpoint of gas barrier properties, heat resistance and the like.

After the contents are stored in the container body 1 and the aluminum foil 21 as the inner cap 2 is applied to the mouth portion 11 of the container body 1, the outer cap 3 is attached to the mouth portion 11 of the container body 1 when the outer cap 3 is attached. By adhering the liner material 4 to the inner periphery of the top plate portion 31 of No. 3, the liner material 4 is embossed and molded along the shape of the upper end of the mouth portion 11 of the container body 1 in the outer cap 3. As a result, the liner member 4 is formed with the fitting groove 41 having the outer side wall 41a and the inner side wall 41b which are fitted to the end edge of the mouth 11 of the container body 1. Vertical portions of the outer side wall 41a and the inner side wall 41b of the fitting groove 41 having this flexibility, and the mouth portion 11 of the container body 10 (the mouth portion on which the aluminum foil 21 as the inner cap 2 is fitted) are fitted. By fitting with the upper end of 11), the inside of the container body 1 is sealed and the container 10 is obtained.

As for the size of the liner material 4, the outer diameter may be slightly larger than the outer diameter of the mouth portion 11 so that the edge portion of the mouth portion 11 fits into the fitting groove 41 formed.

The fitting groove 41 of the liner material 4 is preferably formed so that the outer wall 41a is higher than the inner wall 41b. When the outer side wall 41a is formed higher than the inner side wall 41b, the aluminum foil 21 as the inner cap 2 capped along the edge of the mouth 11 of the container body 1 is the liner member 4 This is because the outer wall 41a pushes the inner edge of the mouth portion 11 inward in the radial direction, so that the sealing performance of the aluminum foil 21 with respect to the container body 1 is further improved.

[Method of sealing container]
Next, a method for sealing the container 10 of the above-described embodiment will be described. The method for sealing the container 10 of the above-described embodiment is not particularly limited as long as it can seal the mouth portion 11 of the container body 1, but generally, using a winding machine, A method is adopted in which the outer cap 3 is tightly wound around the container body 1 in which is sealed.

The specific winding method using the winding machine is as follows. First, the contents are stored in the container body 1 in which the screw groove 111 is formed in the mouth portion 11 in advance, and the aluminum foil 21 as the inner cap 2 is attached to the mouth portion 11 of the container body 1. Next, the container body 1 in this state is set on the winding machine, and is screwed into the tubular portion 32 of the outer cap 3 provided with the liner material 4 in alignment with the screw groove 111 of the mouth portion 11 of the container body 1. Form the groove 321 and tighten. At this time, by adhering the liner material 4 around the inside of the top plate portion 31 of the outer cap 3, the liner material 4 is stamped and molded along the shape of the upper end 11 of the container body 1 inside the outer cap 3. Along with the vertical portion of the outer wall 41a of the fitting groove 41 formed in the liner material 4, the liner material 4 is attached to the mouth portion 11 of the container body 1 (the mouth portion 11 to which the aluminum foil 21 as the inner cap 2 is attached). ) Is fitted to the upper end.

The cap 2 that is wound around the container body 1 in this manner is called ROPP (Roll On Pilfer Proof).

Although the present invention has been described above with reference to the drawings, the present invention is not limited to the above embodiment, and various modifications can be made. For example, in the above-described embodiment, as the content, a content containing hydrogen such as hydrogen water is targeted, but the container according to the present invention has a larger molecular size than hydrogen, for example, a content containing carbon dioxide ( It can also be applied to carbonated water).

Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not limited to the following examples.

[Evaluation 1 of hydrogen retention]
Using the container 10 shown in FIG. 1, an evaluation test of hydrogen retention was performed. The conditions are as follows.
<container>
Container body: 38Φ bottle can 300 ml (manufactured by Universal Can Co., Ltd.)
Outer cap:
・38ΦDP2 (the inner wall of the liner is higher than the outer wall; made by Nippon Closure Co.)
・38Φ flat (no liner; made by Nippon Closure Co.)
Inner cap: Aluminum tape S (aluminum foil; manufactured by Nitoms)
<Hydrogen measurement method>
A needle type hydrogen concentration measuring device (manufactured by Unisense) was used.
<Device conditions, etc.>
The hydrogen water to be stored was manufactured by dissolving hydrogen in water. The produced hydrogen water was stored in a bottle can and filled with liquid nitrogen (LN ₂ ), and then an aluminum foil was attached to the mouth of the container body and the outer cap was tightened. The pressure inside the bottle can was unknown, and post sterilization was not performed.

In Example 1, when the outer cap (DP2) in which the inner wall of the liner is higher than in the outer wall is used in combination with the aluminum foil, in Example 2, the outer cap (flat) without liner is used in combination with the aluminum foil. In that case, Comparative Example 1 is a case where only the outer cap (DP2) in which the inner wall of the liner is higher than the outer wall is used and the aluminum foil is not used.

For Examples 1 and 2 and Comparative Example 1, the hydrogen concentration up to 2 months after the production (25°C) and the hydrogen remaining rate from 6 days after the production to 2 months after the production (25°C) are shown in Table 1. Shown in. In Tables 1 and 2, "head space" means the upper side of the bottle can to prevent the bottle can body from expanding or contracting due to heating or cooling after sealing the bottle can with an outer cap or the like. It means the space provided.

〔result〕
The hydrogen retention rate from 6 days after production to 2 months after production (25°C) is higher when the aluminum foil is attached, and in particular, the outer cap (DP2) where the inner wall of the liner is higher than the outer wall is used. It was better to be there.

[Evaluation of hydrogen retention 2]
A hydrogen retention evaluation test was performed under the same conditions as in the above hydrogen retention evaluation 1 except that DP3A (the outer wall of the liner was higher than the inner wall) was used as the outer cap with liner.

In Example 1, when the outer cap (DP3A) in which the outer wall of the liner is higher than in the inner wall is used in combination with the aluminum foil, in Example 2, the outer cap (flat) without liner is used in combination with the aluminum foil. In that case, Comparative Example 1 is a case where only the cap (DP3A) in which the outer wall of the liner is higher than the inner wall is used and the aluminum foil is not used.

Regarding Examples 1 and 2 and Comparative Example 1, from the hydrogen concentration up to 2 months after production (25°C and 45°C) and from 7 days after production to 2 months after production (25°C and 45°C). Table 2 shows the residual hydrogen ratio.

〔result〕
The hydrogen residual rate from 7 days after production to 2 months after production (25°C and 45°C) is higher when the aluminum foil is attached, and especially when the outer wall of the liner is higher than the inner wall (DP3A). ) Was higher.

Moreover, with respect to Example 1, Example 2 and Comparative Example 1 described in Table 2, Example 3, Example 4 and Comparative Example 2 were performed under the same conditions except that the container body was changed to a pouch container including an aluminum layer. Was manufactured. As a result of evaluating the hydrogen retention after 2 months of production in the same manner as in the above test, it was confirmed that the hydrogen retention of Examples 3 and 4 was higher than that of Comparative Example 2.

Further, as a reference, as a result of evaluating hydrogen retention properties of commercially available hydrogen water A (PET container, manufactured by Oku Nagara Meimizu Co., Ltd.) and hydrogen water B (PET container, manufactured by Hita Tenryosui Co., Ltd.) in the same manner as the above test, both results were obtained. The hydrogen concentration within the expiration date was 0 ppm, and hydrogen retention was not confirmed.

As described above, according to the container of the present invention, the mouth of the container body is sealed with the inner cap, and the mouth capped with the inner cap is further sealed with the outer cap by screwing. The release of hydrogen from the mouth of the container body can be suppressed.

Container 10
Container body 1
Mouth 11
Screw groove 111
Inner cap 2
Aluminum foil 21
Skirt part 211
Outer cap 3
Top plate part 31
Tubular part 32
Screw groove 321
Liner material 4
Mating groove 41
Outer wall 41a
Inner wall 41b

Claims (6)

A container for storing contents containing hydrogen,
A container body having a mouth serving as an entrance and exit for the contents,
An inner cap that is capped on the edge of the mouth to seal the mouth,
An outer cap that is screwed into the mouth portion to which the inner cap is attached. The container according to claim 1, wherein the inner cap is an aluminum foil attached to an edge portion of the mouth portion. The container according to claim 1 or 2, wherein the outer cap includes a liner material that fits into an edge portion of the mouth portion. The container according to claim 3, wherein the liner material has a fitting groove into which an edge portion of the mouth portion fits. The container according to claim 4, wherein the outer peripheral wall of the fitting groove is formed higher than the inner peripheral wall. A method for improving hydrogen retention of a container containing a content containing hydrogen, comprising:
A step of capping an inner cap on the edge of the mouth portion so as to seal the mouth portion serving as the entrance and exit of the contents provided in the container body,
And a step of screwing an outer cap onto the mouth portion to which the inner cap is attached.

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