JP2607049Y2 - Plastic plug for carbonated beverage bottle - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin plug for inserting into a bottle of a carbonated beverage bottle such as sparkling wine and closing the bottle. The present invention relates to a synthetic resin plug for a glass bottle for carbonated beverages to be obtained.

In the present invention, the bottom of the plug is
It includes not only the bottom at the tip but also the side near the bottom that does not come into contact with the inner surface of the bottle when the barrel is fitted.

[0003]

2. Description of the Related Art Generally, in the production of glass bottles, it is difficult to control the molding inside the bottle bottle, and the shape of the bottle varies, so that the plug body has appropriate elasticity to ensure sealing performance in order to cope with this. There is a need to. Therefore, the plug body for the glass bottle uses a soft synthetic resin having elasticity. The soft synthetic resin is generally selected from polyethylene, a copolymer mainly composed of ethylene, or a synthetic resin composition mainly composed of these.

A conventional plastic plug of this kind is formed by injection-molding the above-mentioned soft synthetic resin. The plug is formed around the upper part of a cylindrical body which is open at the top and can be fitted into a bottle having a bottom. In addition, the plug body is formed of a plug body formed with a flange that presses against the rim of the bottle, and a top cap formed so as to be fitted to an open portion of the upper part of the plug body. In addition, in the injection molding operation, the gate of the injection molding machine is inevitably positioned corresponding to the center of the bottom of the body in consideration of the shape of the plug body.

[0005]

The conventional synthetic resin plug has a disadvantage that the soft synthetic resin used does not have a very high gas barrier property, and the center of the bottom corresponding to the gate of the injection molding machine is a resin crystal. Gas barrier properties are lower than other parts due to poor properties, gas escape phenomenon increases under predetermined conditions, for example, in a high-temperature atmosphere, and the life of a product is easily shortened.

An object of the present invention is to provide a synthetic resin plug which solves the problem by reducing the amount of gas released from a carbonated beverage bottle.

[0007]

As a result of various experiments, the present inventor has found that the portion related to the amount of gas escaped from the plug body when the plug is closed is mainly the bottom portion 4 of the body portion 5 and the portion of the body portion 5. From the side, it was found that the gas escaping phenomenon hardly occurred, and it was concluded that if the gas escaping amount at the bottom 4 was reduced, the initial purpose could be achieved. One of the causes of the large amount of gas escaped from the bottom 4 is as follows.
It was considered that the gas barrier property of the bottom center 9 corresponding to the gate of the injection molding machine was low.

In view of the above, the present invention has, for example, a flange 6 which is formed by injection molding a soft synthetic resin and which is pressed into contact with the edge of the bottle opening 2, and which has an upper portion 3 opened and a bottom portion 4.
A synthetic resin plug 1 for a carbonated beverage bottle having a cylindrical shape and having a body 5 formed so as to fit tightly into the bottle mouth 2 is provided, and only the bottom portion 4 or the upper surface side of the bottom portion 4 is provided with a gas bag.
A rear layer was provided.

The specific surface area of the bottom 4 is set to 25
It is preferable to form it so as to be 0 mm or less. The specific surface area is a ratio between the surface area and the average thickness.

Further, a gas barrier layer 10 having a high gas barrier property using a thin film of a synthetic resin is provided on the bottom 4 of the body 5.

[0011]

According to the synthetic resin plug 1 of the carbonated beverage bottle, the thickness of the bottom 4 is increased, and the specific surface area of the bottom 4 is set to 250 mm or less.
The gas barrier property of the bottom part 4 is high and the amount of carbon dioxide gas escaping from the bottle is small.

Gas barrier layer 10 using thin film of synthetic resin
Is provided, the gas barrier property of the bottom portion 4 is high and the amount of carbon dioxide gas escaping from the bottle is small.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described in detail with reference to FIGS. Here, FIG. 1 is a partially longitudinal front view showing a state attached to the bottle mouth,
FIG. 2 is a bottom view.

As shown in FIGS. 1 and 2, a synthetic resin plug 1 is a hollow cylindrical body 5 having an open top 3 and a bottom 4, which can be fitted tightly into a bottle opening 2. The upper part 3
A flange 6 formed around the periphery of the bottle opening 2 so as to be in contact therewith.
And a top cap 8 formed so as to be fitted into the open portion of the upper part 3. The center of the flange 6 has an open shape integrally with the open portion of the upper portion 3 of the body portion 5. By fitting the top cap 8 to the open portion,
The plug 1 made of synthetic resin is formed.

In the production of a glass bottle, the shape of the inner surface of the bottle 2 is difficult to control and tends to fluctuate. It is necessary to secure the sealing property by making the contact of the seal tight. Therefore, the plug body 7 is made of a soft synthetic resin having elasticity. This soft synthetic resin is
Specifically, it is selected from polyethylene, a copolymer containing ethylene as a main component or a synthetic resin composition containing these as a main component. A gate (not shown) of the machine is located, and after the processing, the plug body 7 is detached from the injection mold by shearing outside the center 9 of the bottom.

Incidentally, in the case of the synthetic resin plug 1, even if there is no abnormality in the seal between the bottle mouth 2 and the plug body 7, the property that carbon dioxide gas passes through the soft synthetic resin and escapes to the outside, that is, It has gas permeability. This gas escape phenomenon occurs mainly at the bottom 4 of the body 5 and hardly occurs at the side. Then, the gas permeation amount is extremely increased in this portion because the crystallinity of the resin at the bottom center 9 is poor. Therefore, as shown in FIG. 1, the bottom portion 4 in the present embodiment is formed thicker than the side portion in order to enhance the gas barrier property of the synthetic resin plug 1.
As a gas barrier layer, the gas escape rate is reduced. In addition, the thickness of the bottom 4 is determined by the gas permeation amount of the bottom 4 ξ
(Theoretical value).

The gas permeation amount ξ of the bottom 4 is proportional to the surface area A and inversely proportional to the average thickness t.
It can be obtained by the following equation. ξ = (K · P · D · A / t) / 10 where K: carbon dioxide gas permeability coefficient of resin P: average gas pressure D: days A / t: specific surface area The specific surface area A / t is
This is one important factor that determines the gas permeation amount に お け る at the bottom 4.

Table 1 below shows the size of each bottom portion having the same outer shape (different in inner shape) and the specific surface area A / t obtained therefrom in order to compare the first embodiment with the conventional example. It is. In addition, used in Table 1 (thickness center surface area)
Means (surface area of the virtual solid covered by a plane passing through the center of the bottom thickness), and (average thickness) is (volume of resin at the bottom) divided by (thickness center surface area). And (specific surface area) is the value obtained by dividing (surface area) by (average wall thickness), that is, A / t.

According to Table 1, the plug body 7 of the first embodiment is shown.
Has a specific surface area A / t of 227 mm.
It turns out that it is much lower than mm.

The converted values (theoretical value ξI) and the measured values 従 来 R of the gas permeation amounts of the plug body 7 of the first embodiment and the plug body of the conventional example obtained by the equation for obtaining the gas permeation amount ξ are shown in Table 2. Shown in Table 2 shows the ratio and difference between the theoretical value ΔI and the actually measured value ΔR.

As is apparent from Table 2 (comparison of gas permeation amounts), the gas permeation amount of the plug body 7 of the first embodiment is larger than that of the conventional example in both theoretical value ΔI and measured value ΔR. It can be confirmed that it is extremely low. Note that the theoretical value {I and the measured value}
Looking at the ratio and difference of R, it can be seen that the deviation is larger in the conventional example than in the first embodiment. That is, in the present embodiment, the bottom 4 is formed as a thick gas barrier layer as compared with the conventional example.
Thus, it is supported that the gas barrier property at the bottom center 9 corresponding to the gate of the injection molding machine is prevented from lowering.

As described above, in this embodiment, since the specific surface area of the bottom 4 of the body 5 is smaller than that of the conventional example, the bottom 4
Has a high gas barrier property and a small amount of carbon dioxide gas escaping from the bottle, so that there is an advantage that the life of the product can be extended.

Table 3 shows the measured values of the amount of carbon dioxide gas released from the bottles closed using the plug bodies of the conventional example and the first embodiment. As is clear from these numerical values, the amount of escape in the present embodiment is significantly smaller than that in the conventional example.

[Table 3]

Next, a second embodiment of the present invention will be described with reference to FIG. In describing the second embodiment, only the characteristic configuration will be described in detail, and the description of the same configuration as that of the above embodiment will be omitted, and only the reference numeral in FIG. The same reference numerals are used as in the above embodiment. FIG. 3 is a partially longitudinal front view showing a state of being attached to the bottle opening 2.

As shown in FIG. 3, the feature of the second embodiment is that a gas barrier layer 10 having a high gas barrier property is formed on the upper side within the thickness of the bottom portion 4 by using a thin film of a synthetic resin. is there. The thin film is made of a material which is compatible with the soft synthetic resin used for molding the plug body 7 (the same as that used in the above-described embodiment) in a molten state.

The method of providing the gas barrier layer 10 is such that when the plug body 7 is injection-molded, the gap between the bottom of the cavity provided with the gate of the injection mold and the tip of the core is substantially equal to the inner diameter of the cavity of the portion. The thin film 10 is supported and arranged on the opposite side of the side of the gate of the disk piece having a slightly smaller diameter, and a molten synthetic resin is injected from the gate to melt the disk piece. And

As a first modification (not shown) of the second embodiment, there is a method in which a thin film is arranged on the side of the gate of a disk piece to form a gas barrier layer in the same process as in the second embodiment. is there.

Further, as a second modification (not shown) of the second embodiment, there is a method in which thin films are arranged on both sides of a disk piece and a gas barrier layer is formed in the same process as in the second embodiment.

Further, as a modification (not shown) of the second embodiment or the first modification or the second modification, the disk piece carrying the thin film is a foam, and the same process as in the second embodiment is performed. There is a method of forming a gas barrier layer by using

As described above, in the above-described second embodiment, the first modification, the second modification, and these modifications, the gas barrier properties of the bottom portion 4 are improved by the respective gas barrier layers, so that the gas barrier property is improved from the inside of the bottle. There is an advantage that the amount of released carbon dioxide gas is small and the life of the product can be extended.

Table 3 shows the measurement results of the amount of carbon dioxide gas released from the bottles closed by using the plugs of the conventional example and the second embodiment. As is clear from these numerical values, the amount of escape in the present embodiment is significantly smaller than that in the conventional example.

[0030] In addition, the present invention is, have a high gas barrier property
The present invention is not limited to the above-described first and second embodiments or modifications as long as it has a bottom provided with a gas barrier layer .

[0031]

[Effect of the invention] As described above, according to the invention, the bottom,
In particular, the gas barrier property at the center of the bottom corresponding to the gate of the injection molding machine is high, and it is possible to reduce the escape amount of carbon dioxide from the inside of the bottle.

[Brief description of the drawings]

FIG. 1 is a partially longitudinal front view showing a state of being attached to a bottle mouth in a first embodiment.

FIG. 2 is a bottom view of the plug body in the first embodiment.

FIG. 3 is a partially longitudinal front view of a plug body showing a state of being attached to a bottle mouth in a second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Synthetic resin plug 2 Bottle mouth 3 Top 4 Bottom 5 Body 7 Plug body 9 Center of bottom 10 Gas barrier layer

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Hiroyuki Yamaguchi 1-17-16 Shinkawa, Chuo-ku, Tokyo Inside National Crown Co., Ltd. (56) References JP-A-49-36487 (JP, A) −56548 (JP, U) Japanese Utility Model Application No. 2-129024 (JP, U) Japanese Utility Model Application No. 1-158458 (JP, U) (58) Fields surveyed (Int. Cl. ⁷ , DB name) B65D 39/00

Claims (3)

(57) [Scope of request for utility model registration] 1. A synthetic resin plug for a carbonated beverage bottle obtained by injection-molding a soft synthetic resin, comprising a cylindrical body having a bottom formed to fit tightly into a bottle mouth,
A synthetic resin plug for a carbonated beverage bottle, wherein a gas barrier layer is provided only on the bottom part. 2. A synthetic resin plug for a carbonated beverage bottle obtained by injection molding a soft synthetic resin, comprising a cylindrical body having a bottom formed to fit tightly into a bottle mouth,
A synthetic resin plug for a carbonated beverage bottle, wherein a gas barrier layer is provided on the upper surface side of the bottom portion. 3. A gas barrier layer having high gas barrier properties.
2. A thin film of a synthetic resin that is used.
Or the synthetic resin plug of the bottle for carbonated drinks according to claim 2 .