JP2003118767A - Packing for container - Google Patents
Packing for containerInfo
- Publication number
- JP2003118767A JP2003118767A JP2001314482A JP2001314482A JP2003118767A JP 2003118767 A JP2003118767 A JP 2003118767A JP 2001314482 A JP2001314482 A JP 2001314482A JP 2001314482 A JP2001314482 A JP 2001314482A JP 2003118767 A JP2003118767 A JP 2003118767A
- Authority
- JP
- Japan
- Prior art keywords
- packing
- container
- polypropylene
- foamed sheet
- lid
- 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.)
- Pending
Links
Landscapes
- Gasket Seals (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Closures For Containers (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、容器とその蓋との
密封性を高めるために蓋の内頂面に使用する容器用パッ
キングに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a container packing used for the inner top surface of a lid in order to enhance the tightness between the container and its lid.
【0002】[0002]
【従来の技術】従来、この種の容器用パッキングはポリ
オレフィンを原料とする発泡シートが使用されていた。
このポリオレフィンの中でも低密度ポリエチレンが多用
されている。即ち、低密度ポリエチレンを原料とする発
泡シートは、微細セルを有し、表面が平滑で柔軟性があ
り、焼酎、日本酒、ウイスキー、ワイン等のアルコール
飲料の容器とその蓋とのパッキング材として、或いは化
粧品、シャンプー等の容器とその蓋とのパッキング材と
して広く利用されている。2. Description of the Related Art Conventionally, a foamed sheet made of polyolefin has been used for this kind of container packing.
Among these polyolefins, low density polyethylene is often used. That is, the foamed sheet made of low-density polyethylene as a raw material has fine cells, has a smooth and flexible surface, and shochu, sake, whiskey, as a packing material for the lid and its container for alcoholic beverages such as wine, Alternatively, it is widely used as a packing material for a container for cosmetics, shampoo, etc. and its lid.
【0003】ところが、低密度ポリエチレンを原料とす
る発泡シートは、耐熱性が低く、温度が80°Cを超え
ると復元性が低下するため、密封性が悪くなるという欠
点があった。従って、80°Cを超える内容物を充填す
るか、あるいは充填後レトルト殺菌する場合には使用で
きなかった。However, the foamed sheet made of low-density polyethylene has a low heat resistance and has a drawback that the sealing property is deteriorated because the restorability is lowered when the temperature exceeds 80 ° C. Therefore, it could not be used when filling contents exceeding 80 ° C. or when performing retort sterilization after filling.
【0004】そこで、ポリオレフィンの中で低密度ポリ
エチレンより耐熱性の高いポリプロピレンを原料とする
発泡シートの製造が試みられた。また、ポリプロピレン
とポリエチレンとを一定割合で混合して発泡させる方法
やポリプロピレンを架橋させる方法が試行された。Therefore, an attempt has been made to produce a foamed sheet using polypropylene, which has higher heat resistance than low-density polyethylene among polyolefins, as a raw material. Further, a method of mixing polypropylene and polyethylene in a fixed ratio to foam and a method of crosslinking polypropylene were tried.
【0005】[0005]
【発明が解決しようとする課題】しかしながら、低密度
ポリエチレンより耐熱性の高いポリプロピレンは、結晶
化し易く、発泡に適性な成形条件幅が狭く、良好な発泡
シートを安定的に生産することができなかったし、ポリ
プロピレンとポリエチレンとを一定割合で混合発泡させ
る方法にて作られたものは耐熱性に欠け、連続気泡率が
高くなり過ぎた。また、架橋させる方法では工程数が増
加しコスト的に満足が得られなかった。However, polypropylene, which has higher heat resistance than low-density polyethylene, is easy to crystallize, has a narrow range of molding conditions suitable for foaming, and cannot stably produce a good foamed sheet. However, those produced by a method of mixing and foaming polypropylene and polyethylene at a constant ratio lacked heat resistance and the open cell ratio became too high. In addition, the method of cross-linking increases the number of steps and is not satisfactory in terms of cost.
【0006】そこで、本発明者は、流動特性を改善した
発泡成形に適したポリプロピレンが開発されたことに伴
い、そのポリプロピレンを原料とする発泡シートについ
て鋭意研究を行った結果、特定の条件下にある発泡シー
トには容器用のパッキング材として優れた性能があるこ
とを見出し、遂に、本発明を完成した。[0006] Therefore, as a result of the development of polypropylene suitable for foam molding with improved flow characteristics, the present inventor has conducted earnest research on a foam sheet made of the polypropylene, and as a result, under certain conditions. It was found that a certain foamed sheet has an excellent performance as a packing material for a container, and finally the present invention was completed.
【0007】しかして、本発明の目的とするところは、
80°Cを超える内容物を充填する場合でも密封性が低
下せず、しかも、充填後レトルト殺菌する場合にも使用
可能である容器用パッキングを提供することにある。However, the object of the present invention is to
It is an object of the present invention to provide a container packing that does not deteriorate in sealing property even when filling contents exceeding 80 ° C and can be used even when performing retort sterilization after filling.
【0008】[0008]
【課題を解決するための手段】上記の目的を達成するた
め、本発明に係る容器用パッキングは、高溶融張力を有
するポリプロピレンを原料とし、連続気泡率が10%以
下の発泡シートを容器の蓋の内頂面に使用することを特
徴とし、ポリプロピレンの特性を備える上に、表面にス
キン層が形成されるように構成した。In order to achieve the above object, the container packing according to the present invention is made of polypropylene having a high melt tension as a raw material, and a foamed sheet having an open cell rate of 10% or less is used as a container lid. It is characterized in that it is used for the inner top surface of the above, and has the characteristics of polypropylene and has a skin layer formed on the surface.
【0009】また、請求項2に記載の発明に係る容器用
パッキングは、前記発泡シートの原料であるポリプロピ
レンが、メルトフローレート3〜6g/10min、溶
融張力4〜8cN、ロックウエル硬度95〜103であ
り、前記発泡シートの見掛け密度が0.3〜0.6g/
cm3 、厚さが0.5〜3mmの範囲内にあることを
特徴とし、低密度ポリエチレンと同等な微細セルを有
し、表面平滑性にして柔軟性が得られるように構成し
た。In the container packing according to the second aspect of the present invention, the polypropylene as the raw material of the foamed sheet has a melt flow rate of 3 to 6 g / 10 min, a melt tension of 4 to 8 cN, and a Rockwell hardness of 95 to 103. And the apparent density of the foamed sheet is 0.3 to 0.6 g /
It is characterized by having a cm 3 and a thickness within a range of 0.5 to 3 mm, has fine cells equivalent to low-density polyethylene, and is configured to have surface smoothness and flexibility.
【0010】[0010]
【発明の実施の態様】次に、本発明の実施の態様を添付
図面に基づいて説明する。図1は本願パッキングの使用
状態を示す一部切欠斜視図、図2は本願パッキングを構
成する発泡シートの製造装置の略示的説明図、図3は本
願パッキングを構成する発泡シートの電子顕微鏡写真を
表す図、図4は密封性試験結果表を示す図である。図1
において、1は本願パッキングで、該本願パッキング1
は容器(瓶)2の口部2′に螺合する蓋3との密封性を
高めるために、該蓋3の内頂面3′に使用される。DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a partially cutaway perspective view showing a usage state of the present packing, FIG. 2 is a schematic explanatory view of an apparatus for producing a foam sheet constituting the present packing, and FIG. 3 is an electron micrograph of a foam sheet constituting the present packing. FIG. 4 is a view showing a sealability test result table. Figure 1
In FIG. 1, 1 is the present packing, and the present packing 1
Is used on the inner top surface 3'of the lid 3 in order to enhance the hermeticity with the lid 3 screwed into the mouth 2'of the container (bottle) 2.
【0011】前記本願パッキング1を構成する発泡シー
トSは、図2の如く、高溶融張力を有するポリプロピレ
ンaと発泡助剤bとをブレンダー4で均一に混合し、こ
れを原料として押出機5のホッパー6に投入し、押出経
路5′を通してダイス7より連続して押出すが、該押出
経路5′の途中でボンベ8に高圧封入されている発泡剤
cを注入することにより得られる。The foamed sheet S constituting the packing 1 of the present application, as shown in FIG. 2, is obtained by uniformly mixing polypropylene a having a high melt tension with a foaming aid b in a blender 4, and using this as a raw material for an extruder 5. It is put into the hopper 6 and continuously extruded from the die 7 through the extrusion path 5 ', but it can be obtained by injecting the foaming agent c which is high-pressure sealed in the cylinder 8 in the middle of the extrusion path 5'.
【0012】前記高溶融張力を有するポリプロピレンa
の物性は、メルトフローレート3〜6g/10min
(JIS K6758、温度230°C、荷重21.2
N)、溶融張力4〜8cN(温度230°C、オリフィ
ス径2mmφ、押出速度20mm/min、引取速度
3.14mm/min)、ロックウエル硬度95〜10
3(JIS K6758)の範囲内にある。Polypropylene a having the high melt tension
The physical properties of melt flow rate are 3-6g / 10min
(JIS K6758, temperature 230 ° C, load 21.2
N), melt tension 4 to 8 cN (temperature 230 ° C, orifice diameter 2 mmφ, extrusion speed 20 mm / min, take-up speed 3.14 mm / min), Rockwell hardness 95 to 10
It is within the range of 3 (JIS K6758).
【0013】前記高溶融張力を有するポリプロピレンa
は、チッソ石油化学株式会社にて開発されたもので、従
来のポリプロピレンの優れた特性(剛性、耐熱性、耐薬
品性等)を損なうことなく、発泡成形に適するように流
動特性を改善してなるものである。Polypropylene a having the high melt tension
Was developed by Chisso Petrochemical Co., Ltd. and improved the flow characteristics to be suitable for foam molding without impairing the excellent characteristics (rigidity, heat resistance, chemical resistance, etc.) of conventional polypropylene. It will be.
【0014】前記発泡助剤bとして使用できるものに
は、例えば、クエン酸、酒石酸、リンゴ酸、修酸等の有
機酸、また、重炭酸ソーダ、炭酸ソーダ、重炭酸カリ等
の無機塩がある。この発泡補助bには発泡の核となるタ
ルクなどの無機物やアゾジカルボンアミド等の化学発泡
剤も含まれることは勿論である。Examples of the foaming aid b that can be used include organic acids such as citric acid, tartaric acid, malic acid and oxalic acid, and inorganic salts such as sodium bicarbonate, sodium carbonate and potassium bicarbonate. It goes without saying that the foaming auxiliary b contains an inorganic substance such as talc which becomes a core of foaming and a chemical foaming agent such as azodicarbonamide.
【0015】次に、本願パッキング1を構成する発泡シ
ートSの製造方法を具体的に説明すると、先ず、高溶融
張力を有するポリプロピレン(チッソ石油化学株式会社
製)100重量部と、発泡助剤のタルク0.5重量部と
をブレンダー(リボンブレンダー)4を使用して均一に
ブレンドする。Next, the method of manufacturing the foamed sheet S constituting the packing 1 of the present application will be described in detail. First, 100 parts by weight of polypropylene (manufactured by Chisso Petrochemical Co., Ltd.) having a high melt tension and a foaming auxiliary agent are used. 0.5 parts by weight of talc are blended uniformly using a blender (ribbon blender) 4.
【0016】次いで、上記ブレンドした原料を、押出機
5のホッパー6に投入し、該押出機5の押出経路5′の
途中でボンベ8より炭酸ガス(発泡剤)を注入しながら
連続して押出して発泡シートSを得る。Next, the blended raw materials are charged into the hopper 6 of the extruder 5 and continuously extruded while injecting carbon dioxide gas (foaming agent) from the cylinder 8 in the middle of the extrusion path 5'of the extruder 5. The foamed sheet S is obtained.
【0017】このようにして、ダイス7より厚さ1.0
mmで押出された発泡シートSは、見掛け密度0.45
g/cm3 の微細セル(空孔)を有するものとなる。
ここに得た発泡シートSの電子顕微鏡写真を図3に示
す。図3において、符合Tで示す寸法=500μmで、
該寸法Tを基準に測ると、各空孔Kは300μm程度の
大きさにあることが判る。尤も、図面上の大きさは断面
であり、空孔自身の大きさは直に反映されていない。In this way, the thickness of the die 7 is 1.0
The foamed sheet S extruded in mm has an apparent density of 0.45.
It has fine cells (holes) of g / cm 3.
An electron micrograph of the foamed sheet S obtained here is shown in FIG. In FIG. 3, when the dimension indicated by the code T = 500 μm,
When the dimension T is measured as a reference, it can be seen that each hole K has a size of about 300 μm. However, the size in the drawing is a cross section, and the size of the hole itself is not directly reflected.
【0018】前記発泡シートSの連続気泡率を直径32
mmの円盤を15枚打ち抜いて空気比重計(東京サイエ
ンス社製1000型)で測定したところ、10%以下
(具体的には平均8%)であった。表裏面には、図示の
如く、スキン層1a、1bが形成されている。The open cell ratio of the foamed sheet S is determined to be 32
It was 10% or less (specifically, 8% on average) as a result of punching out 15 mm discs and measuring with an air hydrometer (1000 type, manufactured by Tokyo Science Co., Ltd.). As shown, skin layers 1a and 1b are formed on the front and back surfaces.
【0019】次に、上記連続気泡率10%以下の発泡シ
ートS′と、比較例として高溶融張力を有するポリプロ
ピレンとポリエチレンとを100対25で混合し、連続
気泡率40%の発泡シートS″と、低密度ポリエチレン
発泡シート(ハイシート工業株式会社製S100T)と
を、直径24.5mmの容器用パッキングとして打ち抜
き、密封性試験を行った。Next, the foamed sheet S'having an open cell rate of 10% or less and 100 to 25 of polypropylene and polyethylene having a high melt tension as a comparative example were mixed to obtain a foamed sheet S "having an open cell rate of 40%. And a low-density polyethylene foam sheet (S100T manufactured by High Sheet Industry Co., Ltd.) were punched out as a packing for a container having a diameter of 24.5 mm, and a sealability test was conducted.
【0020】密封性試験の試験方法は、前述の如く直径
24.5mmの容器用パッキングを直径30mmのポリ
プロピレン製の蓋の内頂面に装填し、この蓋を、80°
Cの恒温水槽中に浸漬してあった容積110mlのガラ
ス瓶に80°Cの温水100mlを充填した後、その口
部に20kg・cmのトルクで締め、オートクレープに
より所定温度(120°C、130°C)で約30分加
熱殺菌する。As a test method for the hermeticity test, as described above, a container packing having a diameter of 24.5 mm is loaded on the inner top surface of a polypropylene lid having a diameter of 30 mm, and the lid is set at 80 °.
A glass bottle with a volume of 110 ml that had been immersed in a constant temperature water bath of C was filled with 100 ml of warm water at 80 ° C, and then the mouth was tightened with a torque of 20 kg · cm, and a predetermined temperature (120 ° C, 130 ° C) was set by an autoclave. Sterilize by heating at 30 ° C for about 30 minutes.
【0021】加熱殺菌後、前記ガラス瓶を23°Cの雰
囲気中に、24時間放置した後、バキュームゲージを蓋
に刺して瓶内の減圧状態を調べるとともに、上述したよ
うに蓋を締めた後、加熱殺菌しないで、23°Cの雰囲
気中に24時間放置した後、バキュームゲージを蓋に刺
して瓶内の減圧状態を調べたところ、図4の結果を得
た。After heat sterilization, the glass bottle was left in an atmosphere of 23 ° C. for 24 hours, and then a vacuum gauge was pierced into the lid to check the depressurized state in the bottle, and after the lid was closed as described above, After leaving it in an atmosphere of 23 ° C. for 24 hours without heat sterilization, a vacuum gauge was pierced into the lid to check the reduced pressure state in the bottle, and the result of FIG. 4 was obtained.
【0022】図4によると、加熱殺菌しない場合には、
実施例の発泡シートS′と、比較例のポリエチレン製発
泡シートは共に、減圧を維持し、密封性が認められた
が、比較例の発泡シートS″は減圧が維持できずに常圧
になっていた。また、120°C、130°Cで加熱殺
菌した場合には、実施例の発泡シートS′からなる容器
用パッキングは減圧を維持し、密封性が認められたが、
比較例の発泡シートからなる容器用パッキングはポリエ
チレン製の容器用パッキングは減圧が維持できずに常圧
になっていた。加熱殺菌しない場合に減圧を維持できな
かった発泡シートS″は当然に減圧を維持できないとし
て測定はしなかった。According to FIG. 4, when heat sterilization is not carried out,
Both the foamed sheet S'of the example and the polyethylene foamed sheet of the comparative example maintained the reduced pressure and were confirmed to have hermeticity, but the foamed sheet S "of the comparative example could not maintain the reduced pressure and became normal pressure. When heat-sterilized at 120 ° C. and 130 ° C., the container packing made of the foamed sheet S ′ of the example maintained a reduced pressure and was confirmed to be hermetically sealed.
In the container packing made of the foamed sheet of the comparative example, the container packing made of polyethylene could not maintain the reduced pressure and was at normal pressure. The foamed sheet S ″, which could not maintain the reduced pressure without heat sterilization, was of course not measured because the reduced pressure could not be maintained.
【0023】[0023]
【発明の効果】以上の如く、本発明に係る容器用パッキ
ングは、高溶融張力を有するポリプロピレンを原料と
し、連続気泡率が10%以下の発泡シートを容器の蓋の
内頂面に使用することを特徴としているから、80°C
を超える高温殺菌性が得られる上に、表面に形成される
スキン層により高い密封性が確保できるという優れた効
果を奏する。As described above, in the container packing according to the present invention, polypropylene having a high melt tension is used as a raw material, and a foamed sheet having an open cell ratio of 10% or less is used for the inner top surface of the lid of the container. Is characterized by 80 ° C
In addition to the high temperature sterilization property exceeding the above range, the skin layer formed on the surface has an excellent effect of ensuring high sealing property.
【0024】また、請求項2に記載の発明に係る容器用
パッキングは、前記発泡シートの原料であるポリプロピ
レンが、メルトフローレート3〜6g/10min、溶
融張力4〜8cN、ロックウエル硬度95〜103であ
り、前記発泡シートの見掛け密度が0.3〜0.6g/
cm3 、厚さが0.5〜3mmの範囲内にあることを
特徴としているから、低密度ポリエチレンと同等な微細
セルを有し、表面平滑性にして柔軟性が得られ、容器と
蓋との間の高い密封性が図られるという優れた効果を奏
する。In the container packing according to the second aspect of the present invention, polypropylene as a raw material of the foamed sheet has a melt flow rate of 3 to 6 g / 10 min, a melt tension of 4 to 8 cN and a Rockwell hardness of 95 to 103. And the apparent density of the foamed sheet is 0.3 to 0.6 g /
Since it is characterized by having a cm 3 and a thickness within a range of 0.5 to 3 mm, it has fine cells equivalent to low-density polyethylene, has surface smoothness and flexibility, and can form a container and a lid. It has an excellent effect that a high sealing property is achieved.
【図1】本願パッキングの使用状態を示す一部切欠斜視
図である。FIG. 1 is a partially cutaway perspective view showing a usage state of the present packing.
【図2】本願パッキングを構成する発泡シートの製造装
置の略示的説明図である。FIG. 2 is a schematic explanatory view of an apparatus for manufacturing a foamed sheet that constitutes the packing of the present application.
【図3】本願パッキングを構成する発泡シートの電子顕
微鏡写真を表す図である。FIG. 3 is a view showing an electron micrograph of a foamed sheet that constitutes the packing of the present application.
【図4】密封性試験結果表を示す図である。FIG. 4 is a view showing a sealability test result table.
1 本願パッキング 2 容器(瓶) 2′ 容器の口部 3 蓋 3′ 蓋の内頂面 4 ブレンダー 5 押出機 5′ 押出経路 6 ホッパー 7 ダイス 8 ボンベ S 発泡シート a 高溶融張力を有するポリプロピレン b 発泡助剤 c 発泡剤 1 This application packing 2 containers 2'container mouth 3 lid 3'Inner top surface of lid 4 blender 5 extruder 5'extrusion path 6 hopper 7 dice 8 cylinders S foam sheet a Polypropylene with high melt tension b Foaming aid c foaming agent
───────────────────────────────────────────────────── フロントページの続き Fターム(参考) 3E084 AA02 AA12 AB01 AB02 BA01 CA01 CC05 DA01 DB12 DC05 FA09 FB02 GA01 GB01 HA02 HB05 HC03 HD01 3J040 BA01 EA16 FA08 HA06 4F074 AA24 AB00 AB05 BA02 BA03 BA13 BA20 BA84 CA22 CE25 CE46 CE96 DA02 DA09 DA13 DA17 DA20 DA23 DA39 ─────────────────────────────────────────────────── ─── Continued front page F-term (reference) 3E084 AA02 AA12 AB01 AB02 BA01 CA01 CC05 DA01 DB12 DC05 FA09 FB02 GA01 GB01 HA02 HB05 HC03 HD01 3J040 BA01 EA16 FA08 HA06 4F074 AA24 AB00 AB05 BA02 BA03 BA13 BA20 BA84 CA22 CE25 CE46 CE96 DA02 DA09 DA13 DA17 DA20 DA23 DA39
Claims (2)
料とし、連続気泡率が10%以下の発泡シートを容器の
蓋の内頂面に使用することを特徴とする容器用パッキン
グ。1. A container packing, characterized in that a polypropylene sheet having a high melt tension is used as a raw material, and a foamed sheet having an open cell ratio of 10% or less is used for an inner top surface of a lid of the container.
レンが、メルトフローレート3〜6g/10min、溶
融張力4〜8cN、ロックウエル硬度95〜103であ
り、前記発泡シートの見掛け密度が0.3〜0.6g/
cm3 、厚さが0.5〜3mmの範囲内にあることを
特徴とする請求項1に記載の容器用パッキング。2. The polypropylene as a raw material of the foamed sheet has a melt flow rate of 3 to 6 g / 10 min, a melt tension of 4 to 8 cN and a Rockwell hardness of 95 to 103, and an apparent density of the foamed sheet of 0.3 to 0. 0.6 g /
The packing for containers according to claim 1, wherein the packing has a size of cm 3 and a thickness of 0.5 to 3 mm.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001314482A JP2003118767A (en) | 2001-10-11 | 2001-10-11 | Packing for container |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001314482A JP2003118767A (en) | 2001-10-11 | 2001-10-11 | Packing for container |
Publications (1)
Publication Number | Publication Date |
---|---|
JP2003118767A true JP2003118767A (en) | 2003-04-23 |
Family
ID=19132792
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2001314482A Pending JP2003118767A (en) | 2001-10-11 | 2001-10-11 | Packing for container |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2003118767A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005238760A (en) * | 2004-02-27 | 2005-09-08 | Shin Etsu Polymer Co Ltd | Hygroscopic packing material |
JP2006123970A (en) * | 2004-10-28 | 2006-05-18 | Yoshino Kogyosho Co Ltd | Seal member for container |
JP2015193393A (en) * | 2014-03-31 | 2015-11-05 | 大和製罐株式会社 | Gasket |
-
2001
- 2001-10-11 JP JP2001314482A patent/JP2003118767A/en active Pending
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005238760A (en) * | 2004-02-27 | 2005-09-08 | Shin Etsu Polymer Co Ltd | Hygroscopic packing material |
JP4583780B2 (en) * | 2004-02-27 | 2010-11-17 | 信越ポリマー株式会社 | Hygroscopic packing material |
JP2006123970A (en) * | 2004-10-28 | 2006-05-18 | Yoshino Kogyosho Co Ltd | Seal member for container |
JP4698202B2 (en) * | 2004-10-28 | 2011-06-08 | 株式会社吉野工業所 | Container seal |
JP2015193393A (en) * | 2014-03-31 | 2015-11-05 | 大和製罐株式会社 | Gasket |
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