JPS6040966B2 - Method for manufacturing multilayer containers - Google Patents
Method for manufacturing multilayer containersInfo
- Publication number
- JPS6040966B2 JPS6040966B2 JP58116834A JP11683483A JPS6040966B2 JP S6040966 B2 JPS6040966 B2 JP S6040966B2 JP 58116834 A JP58116834 A JP 58116834A JP 11683483 A JP11683483 A JP 11683483A JP S6040966 B2 JPS6040966 B2 JP S6040966B2
- Authority
- JP
- Japan
- Prior art keywords
- container
- resin
- layer
- coextrusion die
- moisture permeability
- 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/22—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor using multilayered preforms or parisons
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
- B29K2023/04—Polymers of ethylene
- B29K2023/06—PE, i.e. polyethylene
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
- B29K2023/04—Polymers of ethylene
- B29K2023/08—Copolymers of ethylene
- B29K2023/083—EVA, i.e. ethylene vinyl acetate copolymer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2031/00—Use of polyvinylesters or derivatives thereof as moulding material
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Laminated Bodies (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
- Packages (AREA)
Description
【発明の詳細な説明】
本発明は、園壁で内部に収容空間を構成して共押出ブロ
ー成形にて成形したガス遮断性の優れた多層容器の製造
方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a multilayer container with excellent gas barrier properties, which is formed by coextrusion blow molding and has a storage space formed inside by a garden wall.
エチレン−酢酸ビニル共重合体けん化物は酸素ガス等の
ガス透過性が極めて小さい反面透緑性が大きく、またこ
れのガス透過性は湿度依存性が大きく、高湿度領域では
ガス透過性が増大する欠点がある。Saponified ethylene-vinyl acetate copolymer has extremely low permeability to gases such as oxygen gas, but has high green permeability, and gas permeability is highly dependent on humidity, and gas permeability increases in high humidity areas. There are drawbacks.
この欠点を補うため、エチレン−酢酸ビニル共重合体け
ん化物(以下これをけん化物という)を用いたガス透過
性の小さい容器を作ろうとする場合、けん化物の表面に
透湿性の小さい樹脂を成層する必要があり、これまでに
共押出ブロー成形により、中間層にけん化物を、両外層
にそれぞれ異質の低透緑性の合成樹脂を積層してなる3
層容器が提案されている。To compensate for this drawback, when trying to make a container with low gas permeability using saponified ethylene-vinyl acetate copolymer (hereinafter referred to as saponified material), a resin with low moisture permeability is layered on the surface of the saponified material. Until now, coextrusion blow molding has been used to laminate a saponified material in the middle layer and different low-transparency synthetic resins in both outer layers.
Layered containers have been proposed.
ところで上記従釆の3層容器において、中間層のけん化
物層はその壁厚が1ミクロン以上で充分のガス遮断性能
を有すること、壁厚が薄くなるに従って両外層との層間
接勉強度が増大すること、またけん化物は非常に高価で
あることなどから中間層のけん化物層の壁厚を極力薄く
することがあらゆる面で有利である。By the way, in the above-mentioned subordinate three-layer container, the intermediate saponified layer has sufficient gas barrier performance when its wall thickness is 1 micron or more, and as the wall thickness becomes thinner, the degree of interlayer interaction with both outer layers increases. Since saponified materials are very expensive, it is advantageous in all respects to make the wall thickness of the intermediate saponified material layer as thin as possible.
しかしながら中間層のけん化物の壁厚を極端に薄くすれ
ば、共押出ダィ内のウヱルドーこ起因する膜切れ(ピン
ホール)が生じやすく、折角のけん化物層にピンホール
が生じると逆に容器のガス透過性が増大することとなり
、このため従釆の3層容器ではピンホール発生の危険性
を考慮して中間層のけん化物層を比較的肉厚に構成する
ことを余儀なくされていた。However, if the wall thickness of the saponified material in the intermediate layer is made extremely thin, film breakage (pinholes) due to welds in the coextrusion die will easily occur, and if pinholes occur in the saponified material layer, the container will be damaged. As a result, in conventional three-layer containers, the intermediate saponified material layer had to be made relatively thick in consideration of the risk of pinhole formation.
本発明は上記のことにかんがみなされたもので、低透緑
性の合成樹脂にて構成した囲壁主体層内に、エチレン−
酢酸ビニル共重合体けん化物よりなる複数層の中間層を
、厚み方向に独立離間して各中間層間に上記低透池性の
合成樹脂を介在させて園壁全体にわたって介在させるよ
う多層状に合流させ、この多層状に合流させる際に、中
間層の樹脂をマンドレルの円周方向にずれた位置より供
給して合流させることにより、上記中間層を構成する複
数のけん化物層を共押出ダィ内でのウェルドを気にする
ことなく極めて薄くすることができ、これによって各層
間接着強度が強く、また安価に、さらにガス遮断性に対
する安全率が極めて高い多層容器の製造方法を提供しよ
うとするものである。The present invention was conceived in view of the above, and includes an ethylene-
A plurality of intermediate layers made of saponified vinyl acetate copolymer are independently spaced apart in the thickness direction, and the low-permeable synthetic resin is interposed between each intermediate layer, and they are joined together in a multilayered manner so as to be interposed over the entire garden wall. By supplying the resin of the intermediate layer from a position shifted in the circumferential direction of the mandrel and merging it into the multilayered form, the plurality of saponified material layers constituting the intermediate layer are coextruded through a coextrusion die. To provide a method for manufacturing a multilayer container that can be made extremely thin without worrying about internal welds, has strong interlayer adhesive strength, is inexpensive, and has an extremely high safety factor in terms of gas barrier properties. It is something.
以下本発明の実施態様を図面に基づいて説明する。Embodiments of the present invention will be described below based on the drawings.
図中1は本発明に係る製造方法にて製造された多層容器
であって、囲壁で内部に収容空間を構成して共押出ブロ
ー成形にて形成してある。In the figure, reference numeral 1 indicates a multilayer container manufactured by the manufacturing method according to the present invention, which is formed by coextrusion blow molding with a housing space defined inside by a surrounding wall.
そしてこの多層容器1は、低密度、中密度および高密度
ポリエチレンあるいはポリプロピレン等の低透湿性の合
成樹脂によりその園壁主体2が構成され、この囲壁主体
2内に、エチレン含量25〜60モル%、けん化度90
%以上のエチレン−酢酸ピニル共重合体けん化物よりな
る2層の中間層3,4が函壁主体2の厚み方向に独立離
間し、かつ囲壁全体にわたって介在させてある。第2図
は本発明に係る多層容器の製造方法を示すもので、囲壁
を各層毎にわけて多層として共押出用ダィ5からパリス
ン6を押出し、この多層パリスン6を成形型7にて被持
して正圧の流体を吹込むことによりブロー成形する。The main wall 2 of this multilayer container 1 is made of a synthetic resin with low moisture permeability such as low density, medium density, and high density polyethylene or polypropylene, and the main wall 2 has an ethylene content of 25 to 60 mol%. , saponification degree 90
% or more of ethylene-pinyl acetate copolymer are independently spaced apart in the thickness direction of the main body 2 of the box wall, and are interposed over the entire surrounding wall. FIG. 2 shows a method for manufacturing a multilayer container according to the present invention, in which the surrounding wall is divided into layers, a parison 6 is extruded from a coextrusion die 5, and this multilayer parison 6 is covered with a mold 7. Blow molding is performed by holding the mold and blowing fluid under positive pressure.
上記多層パリスン6を構成する各層の樹脂は2台もしく
はそれ以上の押出機より共押出用ダィ5へ供給され、マ
ンドレル8の周囲方向にかつ軸方向に位置をずらせて設
けた流入口5a,5b,5c,5d,5eから供給され
る。The resin of each layer constituting the multilayer parison 6 is supplied to a coextrusion die 5 from two or more extruders, and inlets 5a are provided at positions shifted in the circumferential direction and axial direction of the mandrel 8. It is supplied from 5b, 5c, 5d, and 5e.
そしてこのとき、特に両中間層3,4は極端に薄くする
と、流入口5b,5dから流入した中間層用の樹脂はマ
ンドレル8の周方向に分流した後流入口と反対側で合流
するゥェルド部で膜切れによるピンホールが発生する恐
れがある。このためこの両中間層3,4用の樹脂流入口
5b,5dをマンドレル8の円周方向に位置をずらせて
おく。これにより、たとえ、両中間層3,4のウェルド
部にピンホールが生じたとしてもこれが互いに円周方向
に位置がずれることになってガス遮断性が低下すること
がなくなる。以下に本発明の実施例と従来例の多層容器
の構成を示し、これの比較をする。At this time, especially when both the intermediate layers 3 and 4 are made extremely thin, the resin for the intermediate layer that flows in from the inlets 5b and 5d is divided in the circumferential direction of the mandrel 8 and then merges at the weld portion on the opposite side of the inlet. Pinholes may occur due to film breakage. For this reason, the positions of the resin inlets 5b and 5d for both intermediate layers 3 and 4 are shifted in the circumferential direction of the mandrel 8. As a result, even if pinholes are formed in the weld portions of both intermediate layers 3 and 4, the positions of these pinholes will not shift in the circumferential direction and the gas barrier properties will not deteriorate. The configurations of multilayer containers according to an embodiment of the present invention and a conventional example will be shown below and compared.
実施例
内容量300cc、重量12夕の多層容器を、囲壁主体
2を低密度ポリエチレンで、2層の中間層3,4をけん
化物(エチレン含量35モル%、けん化度99%)で構
成し、それぞれの胴部平均肉厚が、囲壁主体のうち各中
間層3,4より外側で0.8凧、内側で0.7柵、中間
層3,4の間で0.5肌であり、また各中間層3,4の
うち外側に位置する中間層3で0.002肌、内側に位
贋する中間層4で0.003豚とあるようにして共押出
ブロー成形により作った。Example: A multilayer container with an internal capacity of 300 cc and a weight of 12 mm, the main wall 2 being made of low density polyethylene, and the two intermediate layers 3 and 4 being made of saponified material (ethylene content 35 mol%, degree of saponification 99%), The average wall thickness of each torso is 0.8 thick on the outside of each middle layer 3 and 4 of the surrounding wall main body, 0.7 thick on the inside, and 0.5 thick between middle layers 3 and 4, and Each of the intermediate layers 3 and 4 was made by coextrusion blow molding so that the outer intermediate layer 3 had a thickness of 0.002 mm, and the inner intermediate layer 4 had a thickness of 0.003 mm.
比較例
上言己実施例と同一形状の多層容器を、低密度ポリエチ
レンで構成した囲壁主体内に上記実施例に用いたものと
同一のけん化物で1層の中間層を介在させて構成し、そ
れぞれの胸部平均肉厚が中間層で0.008肋、囲壁主
体のうちこの中間層の外側で1.仇帆、内側1.仇肋と
なるようにしてて共押出ブロー成形により作った。Comparative Example A multilayer container having the same shape as the above embodiment was constructed by interposing an intermediate layer of the same saponified material as that used in the above embodiment within the surrounding wall main body made of low density polyethylene, The average wall thickness of each chest is 0.008 ribs in the middle layer, and 1.08 ribs outside of this middle layer in the surrounding wall main body. Vengeance, inside 1. It was made using co-extrusion blow molding to make it more durable.
比較結果
本発明の実施例により作った多層容器は酸素ガス遮断度
、耐透湿度、層間剥離強度のいずれにも従来の比較例に
より作った多層容器より優れていた。Comparison Results The multilayer container made according to the example of the present invention was superior to the multilayer container made according to the conventional comparative example in terms of oxygen gas barrier, moisture permeation resistance, and interlayer peel strength.
なお本発明における多層容器とは、共押出ブロー成形に
より得られる中空体の総称のことであり食料品、調味料
、化粧品、工業薬品等の容器やガソリンタンク等の工業
部品をも含む。Note that the multilayer container in the present invention is a general term for hollow bodies obtained by coextrusion blow molding, and also includes containers for foods, seasonings, cosmetics, industrial chemicals, etc., and industrial parts such as gasoline tanks.
また各層を構成するけん化物と低透緑性樹脂にはその特
性を損なわない範囲で、層間接着性や成形加工性を向上
する目的で、適宜の熱可塑性プラスチックや添加剤およ
び着色剤、帯電防止剤、紫外線防止剤等を配合してもよ
い。さらに本発明の実施例で中間層を2層設けたところ
の5層容器について説明したが、中間層を3層以上とし
全体を7層以上にしてもよい。本発明は以上のようにな
るから、中間層を構成する複数のけん化物層を共押出ダ
ィ内でのウェルドを気にすることなく極めて薄くするこ
とができ、これによって各層間接着強度が強くなり、ま
たけん化物層が極めて薄いことにより安価になり、さら
にガス遮断性に対する安全率が極めて高い多層容器を得
ることができる。In addition, appropriate thermoplastics, additives, colorants, and antistatic materials are added to the saponified materials and low-transparency resins that make up each layer in order to improve interlayer adhesion and moldability without impairing their properties. A UV protection agent, ultraviolet ray inhibitor, etc. may be added. Further, in the embodiment of the present invention, a five-layer container having two intermediate layers has been described, but the intermediate layer may be three or more layers, making the total seven or more layers. Since the present invention is as described above, the plurality of saponified layers constituting the intermediate layer can be made extremely thin without worrying about welding in the coextrusion die, thereby increasing the adhesive strength between each layer. Moreover, since the saponified material layer is extremely thin, it is possible to obtain a multilayer container that is inexpensive and has an extremely high safety factor in terms of gas barrier properties.
第1図は本発明に係る製造方法で製造した多層容器の一
部破断正面図、第2図は本発明に係る容器の製造方法を
示す説明図である。
1は容器、2は園壁主体、3,4は中間層。
第1図第2図FIG. 1 is a partially cutaway front view of a multilayer container manufactured by the manufacturing method according to the present invention, and FIG. 2 is an explanatory view showing the method for manufacturing a container according to the present invention. 1 is the container, 2 is the main garden wall, and 3 and 4 are the middle layers. Figure 1 Figure 2
Claims (1)
−酢酸ビニル共重合体けん化物を、それぞれ2台もしく
はそれ以上の押出機にて溶融混練し、ついで、それぞれ
の樹脂を共押出ダイ5へ供給し、この共押出ダイ5内に
おいて、上記低透湿性の合成樹脂にて構成した囲壁主体
層内に、エチレン−酢酸ビニル共重合体けん化物よりな
る複数層の中間層3,4を、厚み方向に独立離間して各
中間層間に上記低透湿性の合成樹脂を介在させて囲壁全
体にわたつて介在させるよう多層状に合流させ、この多
層状に合流させる際に、中間層3,4の樹脂流入口をマ
ンドレル8の円周方向に位置をずらせて、中間層の樹脂
をマンドレル8の円周方向にずれた位置より供給して合
流させ、ついで共押出ダイ5より多層状のパリスン6を
押出し、これをブロー成形して成形したことを特徴とす
る多層容器の製造方法。1. A synthetic resin with low moisture permeability such as polyethylene and a saponified ethylene-vinyl acetate copolymer are each melt-kneaded using two or more extruders, and then each resin is supplied to a coextrusion die 5. In this coextrusion die 5, a plurality of intermediate layers 3 and 4 made of saponified ethylene-vinyl acetate copolymer are added in the thickness direction within the surrounding wall main layer made of the above-mentioned low moisture permeability synthetic resin. The synthetic resin with low moisture permeability is interposed between each of the intermediate layers, which are separated independently, and are merged in a multilayered manner so as to be interposed over the entire surrounding wall. By shifting the position of the inlet in the circumferential direction of the mandrel 8, the intermediate layer resin is supplied from a position shifted in the circumferential direction of the mandrel 8 and merged, and then the multilayer parison 6 is extruded from the coextrusion die 5, A method for manufacturing a multilayer container, characterized in that the container is formed by blow molding.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP58116834A JPS6040966B2 (en) | 1983-06-30 | 1983-06-30 | Method for manufacturing multilayer containers |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP58116834A JPS6040966B2 (en) | 1983-06-30 | 1983-06-30 | Method for manufacturing multilayer containers |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5964333A JPS5964333A (en) | 1984-04-12 |
JPS6040966B2 true JPS6040966B2 (en) | 1985-09-13 |
Family
ID=14696774
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP58116834A Expired JPS6040966B2 (en) | 1983-06-30 | 1983-06-30 | Method for manufacturing multilayer containers |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6040966B2 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4337491A1 (en) * | 1993-11-03 | 1995-05-04 | Kautex Werke Gmbh | Container manufactured using the co-extrusion blow molding process |
KR100404708B1 (en) * | 2000-10-30 | 2003-11-07 | 주식회사 이생 | Aseptic Food Packing Material |
JP4735808B2 (en) * | 2004-03-29 | 2011-07-27 | 東洋製罐株式会社 | Multilayer resin molding and method for producing the same |
CA2794706C (en) * | 2010-03-31 | 2018-05-22 | Kuraray Co., Ltd. | Multilayered structure and laminate, and method for production of the same |
-
1983
- 1983-06-30 JP JP58116834A patent/JPS6040966B2/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS5964333A (en) | 1984-04-12 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP2615191B2 (en) | Blocking stretch film | |
EP4029802A1 (en) | Sheet material container | |
JP6976032B2 (en) | Tube container | |
CN108602334A (en) | Aluminium for container obstructs layered product and in the barrier lining of shoulder | |
JP4974893B2 (en) | Packaging laminate material | |
JPH0617136B2 (en) | Biaxially oriented container with excellent gas barrier properties | |
CN103237653A (en) | Tube laminate film having at least one oriented barrier layer and tube packaging formed at least partially from such a tube laminate film | |
JP5151463B2 (en) | Composite sheet material for paper container and paper container molded using the composite sheet material | |
JPS6040966B2 (en) | Method for manufacturing multilayer containers | |
JP2021138458A (en) | Tube container | |
JP3921883B2 (en) | Laminated film for laminated tube | |
US20040071904A1 (en) | Thermoformable sheet and fuel tank incorporating same | |
JP6216373B2 (en) | Butt-welded tubular packaging (packagingbody) | |
FI80401C (en) | FLEXIBLE SKIVSTRUKTUR I FLERA SKIKT OCH DESS ANVAENDNING I EN UTMATNINGSTUB. | |
JPS5924506Y2 (en) | container | |
JP2006527127A (en) | Plastic extrusion blow molding injection tube | |
JPH0515177B2 (en) | ||
JP2019135094A (en) | Laminate for vacuum heat insulation material, and vacuum heat insulation material | |
JPH0891397A (en) | Laminated tube container | |
JPS6052945B2 (en) | Tube-shaped composite film | |
JP7255346B2 (en) | Laminated sheets and paper containers | |
US20240200692A1 (en) | Multilayer pipeline | |
KR200351945Y1 (en) | The Tube use lntercaption Gas | |
EP1108592A2 (en) | Permeation barrier fuel tank | |
JP3071684B2 (en) | Chemical packaging |