JPH06547B2 - Synthetic resin container stopper - Google Patents
Synthetic resin container stopperInfo
- Publication number
- JPH06547B2 JPH06547B2 JP59173469A JP17346984A JPH06547B2 JP H06547 B2 JPH06547 B2 JP H06547B2 JP 59173469 A JP59173469 A JP 59173469A JP 17346984 A JP17346984 A JP 17346984A JP H06547 B2 JPH06547 B2 JP H06547B2
- Authority
- JP
- Japan
- Prior art keywords
- synthetic resin
- container stopper
- water
- resin
- resin container
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Description
本発明はシール性能が特にすぐれた合成樹脂製容器栓に
関する。The present invention relates to a synthetic resin container stopper having particularly excellent sealing performance.
【従来の技術】 従来酒、飲料水等を入れる各種瓶に使用されるキャップ
としては高価で開栓時に手の損傷の恐れのあるアルミニ
ウム製キャップに替って、近年低コストで安全な合成樹
脂で成型された容器栓が広く普及している。2. Description of the Related Art Conventionally, as a cap used for various bottles containing liquor, drinking water, etc., which is expensive and may cause hand damage when opened, a synthetic resin which is low cost and safe in recent years The container stopper molded in is widely used.
しかし合成樹脂で形成された容器栓はシール性に問題が
あり、特に内圧が高くなるガスを有する液体、例えばソ
ーダ水、トニックウォーター等を密封するのに対しては
シール性が特に悪い。すなわち合成樹脂製容器栓は熱等
により内圧が高くなると容器栓の頂部が内圧に押されて
持ち上り、頂部内面のシールリングを離間させる。離間
したシールリングはその役割を果さず瓶口への密封性が
悪化する。また、熱を含んだ内圧により変形した場合、
その変形は復元力を失ないさらにシール性の悪いものと
なってしまう。このためシールリングの形状を種々考案
して対処しているが、いまだ有効なものは考えられてい
ない。 このシール不良を防止するためには容器栓の内厚を増し
て対処しなければならず、大きく重いものが実用化され
ているのが実情である。 この欠点を解消すべく考案された一例として、硬質合成
樹脂で成形された容器栓本体で変形に対処し、半硬質合
成樹脂で成形された中栓をシール材として用い、これを
一体にして容器栓を構成したものが有るが、該容器栓は
個別の基材料を必要とし、さらにこの両部を嵌合する面
倒な作業を要し、嵌合不備、または寸法の微少の相違で
容器栓本体と中栓間に隙間を生じ易く密封を不完全にす
るなど根本的な洩れ防止の解決方法とはなりえなかっ
た。However, a container stopper formed of a synthetic resin has a problem in sealing property, and particularly has a poor sealing property for sealing a liquid having a gas whose internal pressure becomes high, such as soda water and tonic water. That is, when the internal pressure of the synthetic resin container stopper increases due to heat or the like, the top of the container stopper is pushed up by the internal pressure and lifts up, and the seal ring on the inner surface of the top is separated. The separated seal rings do not play their role, and the sealing property to the bottle mouth deteriorates. When deformed by internal pressure containing heat,
The deformation does not lose the restoring force and further deteriorates the sealing property. For this reason, various shapes of the seal ring have been devised and dealt with, but an effective one has not been considered yet. In order to prevent this sealing failure, it is necessary to increase the inner thickness of the container stopper to deal with it, and the fact is that a large and heavy one is put into practical use. As an example devised to eliminate this drawback, the container stopper body made of hard synthetic resin copes with the deformation, and the inner stopper made of semi-rigid synthetic resin is used as a sealing material, which is integrated into a container. There are some plugs configured, but the container stopper requires separate base materials, and the bothersome work of fitting both parts is required, and the container stopper main body may be formed due to improper fitting or a slight difference in size. It could not be a fundamental solution to prevent leakage such as a gap between the inner plug and the inner plug is likely to occur and the sealing is incomplete.
本考案は、この様な欠点を解消し、高い内圧を有する液
体に対してもすぐれた密封効果を発揮する合成樹脂製容
器栓を提供するものである。 本発明は二層構造よりなる合成樹脂製の容器栓であっ
て、該二層構造の合成樹脂の容器栓の内層になる合成樹
脂に吸水性樹脂を含有せしめたことを特長とした合成樹
脂製容器栓である。 該吸水性樹脂としては、デンプン系樹脂、セルロース系
樹脂、および合成ポリマー系として、ポリアクリル酸系
樹脂、ポバール系樹脂、ポリオキシエチレン系などがあ
るが、その何れを選択しても良いが、物性、膨張率など
を考慮すればアクリル酸系樹脂が望ましい。また合成樹
脂への添加量は５〜５０部程度であるが、望ましくは１
０〜２０部の範囲で使用するのが良い。これは添加量が
少ないと発泡度が少なくシール性が発揮出来ず、かつ多
すぎると吸水しすぎて強度的に問題となり、これまたシ
ール性が低下するからである。 また、内層の合成樹脂は吸水性樹脂による膨張を容易に
するため、硬度の低いつまり柔い樹脂が適しており、さ
らに食品用に用いられることも考慮に入れれば、ポリエ
チレン、ポリエチレン−酢酸ビニル重合樹脂、エチレ
ン、プロピレン系エラストマー、その他一般に熱可塑性
エラストマーといわれるものが良いが、中でもポリエチ
レン系樹脂が吸水性の点で有利であり、さらにはポリエ
チレン−酢酸ビニル共重合体のものが最適である。The present invention solves such drawbacks and provides a synthetic resin container stopper that exhibits an excellent sealing effect even for a liquid having a high internal pressure. The present invention relates to a synthetic resin container stopper having a two-layer structure, characterized in that a water-absorbing resin is contained in the synthetic resin which is the inner layer of the two-layer structure synthetic resin container stopper. It is a container stopper. The water-absorbent resin includes starch-based resins, cellulose-based resins, and synthetic polymer-based resins such as polyacrylic acid-based resins, poval-based resins, and polyoxyethylene-based resins, but any of them may be selected. Considering the physical properties and the expansion coefficient, acrylic resin is preferable. The amount added to the synthetic resin is about 5 to 50 parts, preferably 1 part.
It is preferable to use it in the range of 0 to 20 parts. This is because if the amount of addition is small, the degree of foaming is small and the sealing property cannot be exhibited, and if it is too large, it absorbs too much water and causes a problem in strength, and also the sealing property is deteriorated. Further, since the synthetic resin of the inner layer facilitates expansion by the water-absorbing resin, a resin having low hardness, that is, a soft resin is suitable, and in consideration of being used for food, polyethylene, polyethylene-vinyl acetate polymerization is also taken into consideration. Resins, ethylene, propylene-based elastomers and others generally called thermoplastic elastomers are preferable. Among them, polyethylene-based resins are advantageous in terms of water absorption, and polyethylene-vinyl acetate copolymers are most preferable.
この合成樹脂製容器栓を得る方法として、該吸水性樹脂
を含有した合成樹脂層を内層とし、比較的硬度ある合成
樹脂を外層として、これを二色インジェクション成型を
利用して所望の形状の容器栓に成型して得ることによ
り、二種の材料で一度に完全なシール性を有する容器栓
が出来、コスト的にも非常に有利である。しかもシール
部の脱落の全く心配のない一体形の容器栓が得られる。 この様に内層側に吸水性樹脂を含有した合成樹脂を有す
る合成樹脂製容器栓を内容物を充填した瓶の瓶口に打栓
すると、吸水性樹脂は吸水してその体積を膨張せしめ、
しっかりと瓶口に密着して完全なシール性能を発揮す
る。 なお容器栓を瓶口に打栓してから合成樹脂層の吸水を速
やかに行わせしめるためには、吸水性樹脂ができるだけ
表面に配列することが望ましく、このためには、合成樹
脂層の所定の配合に脂肪族系の溶剤を添加し、オルガノ
ゾルにしてやることにより、より効果的なシール性を得
る。 また、合成樹脂層の硬度はJIS硬度計Ａで７０未満であ
ることが望ましく、最適には６０程度が良い。これは硬
度が高いと吸水が遅れるからである。しかし、これも用
途によっては硬い場合も必要で特に限定はしない。 また、外層の合成樹脂は、ポリエチレン、ポリアロピレ
ン、ポリエチレンテレフタレート、ポリブチレンテレフ
タレートなどの熱可塑性合成樹脂であれば良いが、成型
性、経済性、安全性などの点からポリエチレン樹脂が望
ましい。 さらに吸水性樹脂を含有する内層の合成樹脂は全面に設
けたものに限らず、容器栓の頂部のみに設けても良く、
さらには瓶口と接する部分に凸出するライナー形状のも
のを成型することにより、よりシール効果を高めること
も可能である。 この様に二色インジェクション成型等で所望の容器栓に
成型して得られた容器栓を内容物を充填した瓶の瓶口に
打栓すると、合成樹脂層は厚み方向に1.5〜３倍膨張し
すぐれたシール性能を発揮した。なお瓶口は新しいもの
と、傷つき瓶口の両方のものを用意し、これに容器栓を
打栓したが、いずれも内容物の漏れは見られずすぐれた
シール性能を発揮した。これは特に傷つき瓶口に対して
も、他のシールライナーと異って打栓後にシールが膨張
して傷の部分をうめてしまうためで、瓶口に沿って理想
的にシールするため、すぐれたシール性能を発揮するも
のである。また打栓後震動、落下等の外的衝撃や変形に
対してもつねに対応できすぐれたシール性を保持する。As a method for obtaining this synthetic resin container stopper, a synthetic resin layer containing the water-absorbent resin is used as an inner layer and a relatively hard synthetic resin is used as an outer layer, and a container having a desired shape is formed by using two-color injection molding. By molding into a stopper, a container stopper having a perfect sealing property can be formed with two kinds of materials at one time, which is very advantageous in terms of cost. In addition, an integrated container stopper can be obtained without any worry of the seal portion falling off. In this way, when the synthetic resin container stopper having the synthetic resin containing the water absorbent resin on the inner layer side is plugged into the bottle mouth of the bottle filled with the contents, the water absorbent resin absorbs water to expand its volume,
It firmly adheres to the bottle mouth and exhibits perfect sealing performance. In order to promptly absorb water in the synthetic resin layer after the container stopper is plugged into the bottle mouth, it is desirable that the water absorbent resin is arranged on the surface as much as possible. A more effective sealing property can be obtained by adding an aliphatic solvent to the composition to form an organosol. The hardness of the synthetic resin layer is preferably less than 70 as measured by JIS hardness tester A, and optimally about 60. This is because water absorption is delayed when the hardness is high. However, this is also necessary depending on the application and is not particularly limited. The synthetic resin for the outer layer may be a thermoplastic synthetic resin such as polyethylene, polyalopylene, polyethylene terephthalate, polybutylene terephthalate, but is preferably a polyethylene resin from the viewpoint of moldability, economy, safety and the like. Further, the synthetic resin of the inner layer containing the water absorbent resin is not limited to the one provided on the entire surface, and may be provided only on the top of the container stopper,
Further, it is possible to further enhance the sealing effect by molding a liner shape projecting at a portion contacting the bottle mouth. In this way, when the container stopper obtained by molding into a desired container stopper by two-color injection molding or the like is plugged into the bottle mouth of the bottle filled with the contents, the synthetic resin layer expands 1.5 to 3 times in the thickness direction. Demonstrated excellent sealing performance. Both the new bottle mouth and the scratched bottle mouth were prepared, and the container stoppers were plugged into these bottles. However, none of the contents leaked and exhibited excellent sealing performance. This is because even with a damaged bottle mouth, unlike other seal liners, the seal expands and fills the scratched part after plugging, and because it seals ideally along the bottle mouth, it is excellent. It exhibits excellent sealing performance. In addition, it retains excellent sealability by always being able to respond to external shocks and deformations such as shaking and dropping after plugging.
この様に、本発明は従来の弾性のあるシールライナーで
打栓圧でライナーを押付けてシールする方法と全く異
り、打栓後シール部分が水分を吸収して膨張し空隙を完
全に密封するので、従来ではどうしても漏れの心配があ
った傷つき瓶口に対してもすぐれたシール性能を発揮し
特に内圧のかかる瓶口に対してもすぐれたシール性能を
発揮する理想的合成樹脂製容器栓が得られる。As described above, the present invention is completely different from the conventional method in which the liner is pressed by the capping pressure with the elastic seal liner to seal it, and after the plugging, the sealing part absorbs moisture and expands to completely seal the gap. Therefore, there is an ideal synthetic resin container stopper that exhibits excellent sealing performance even for scratched bottle mouths that have inevitably leaked in the past and especially for bottle mouths that are subject to internal pressure. can get.
Claims (3)
て、該容器栓の内層になる合成樹脂に吸水性樹脂を含有
せしめることを特長とした合成樹脂製容器栓。1. A synthetic resin container stopper having a two-layer structure, characterized in that a synthetic resin forming an inner layer of the container stopper contains a water-absorbing resin.
塑性エラストマー、ポリエチレン系樹脂である特許請求
の範囲第１項記載の合成樹脂製容器栓。2. The synthetic resin container stopper according to claim 1, wherein the synthetic resin inner layer containing the water-absorbent resin is a thermoplastic elastomer or a polyethylene resin.
エチレン−酢酸ビニル共重合体である特許請求の範囲第
１項または第２項記載の合成樹脂製容器栓。3. The synthetic resin container stopper according to claim 1 or 2, wherein the synthetic resin inner layer containing a water-absorbent resin is a polyethylene-vinyl acetate copolymer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59173469A JPH06547B2 (en) | 1984-08-20 | 1984-08-20 | Synthetic resin container stopper |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59173469A JPH06547B2 (en) | 1984-08-20 | 1984-08-20 | Synthetic resin container stopper |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6160455A JPS6160455A (en) | 1986-03-28 |
| JPH06547B2 true JPH06547B2 (en) | 1994-01-05 |
Family
ID=15961055
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59173469A Expired - Lifetime JPH06547B2 (en) | 1984-08-20 | 1984-08-20 | Synthetic resin container stopper |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06547B2 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57194959A (en) * | 1981-05-22 | 1982-11-30 | Kishimoto Akira | Vessel cover |
-
1984
- 1984-08-20 JP JP59173469A patent/JPH06547B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6160455A (en) | 1986-03-28 |
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