JPH0615198B2 - Method for manufacturing multi-layer container - Google Patents
Method for manufacturing multi-layer containerInfo
- Publication number
- JPH0615198B2 JPH0615198B2 JP62116965A JP11696587A JPH0615198B2 JP H0615198 B2 JPH0615198 B2 JP H0615198B2 JP 62116965 A JP62116965 A JP 62116965A JP 11696587 A JP11696587 A JP 11696587A JP H0615198 B2 JPH0615198 B2 JP H0615198B2
- Authority
- JP
- Japan
- Prior art keywords
- layer
- polypropylene resin
- container
- gas barrier
- injection
- 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
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- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、高強度で透明性に優れたガスバリヤ性を有す
る多層容器の製造方法に関するものであり、特に食品の
鮮度保持や品質変化を防止するための多層容器の製造方
法であり、ポリプロピレン系樹脂を主構成とするガスバ
リヤ性を有する多層容器を１つの射出装置を用いて製造
することが出来る射出延伸多層容器の製造方法である。Description: TECHNICAL FIELD The present invention relates to a method for producing a multi-layer container having high strength and gas barrier properties with excellent transparency, and particularly to prevent food freshness and quality change. A method for producing an injection stretched multi-layered container, which is capable of producing a multi-layered container mainly composed of polypropylene resin and having a gas barrier property using a single injection device.
従来、ポリプロピレン系樹脂を主構成とするガスバリヤ
性を有する多層容器の製造方法としては、ガスバリヤ性
を有するポリプロピレン系樹脂を主構成とする積層シー
トを真空成形方法或いは真空圧空成形方法等により、容
器形状に成形する方法が行なわれている。しかし、これ
等の成形方法において得られた多層容器は、その強度が
弱かったり、透明性が悪く、容器としては充分に満足し
て使用出来るものではなかった。Conventionally, as a method for producing a multi-layer container having a gas barrier property mainly composed of polypropylene resin, a laminated sheet mainly composed of polypropylene resin having a gas barrier property is formed into a container shape by a vacuum forming method or a vacuum pressure forming method. The method of molding into is used. However, the multilayer containers obtained by these molding methods are weak in strength and poor in transparency, and cannot be used as a container with sufficient satisfaction.
他方、射出成形と延伸、延伸吹込みを行なう容器の成形
方法は行なわれてはいるが、射出装置を２つ以上有する
射出延伸多層容器成形方法は、機構が複雑となること
や、装置費用が高価になる等問題があり、ポリプロピレ
ン系樹脂を主構成とするガスバリヤ性を有する多層容器
は得られないものであった。On the other hand, although a method of molding a container that performs injection molding, stretching, and stretch blowing has been performed, the method of molding an injection stretched multi-layer container having two or more injection devices has a complicated mechanism and requires a high equipment cost. Due to problems such as high cost, a multi-layer container having a polypropylene resin as a main component and having a gas barrier property cannot be obtained.
本発明者等は、高強度で透明性に優れたガスバリヤ性を
有する多層容器の製造方法について種々検討を行ない、
ポリプロピレン系樹脂を主構成とするガスバリヤ性を有
する積層シートと射出、延伸容器成形方法とを組み合わ
せ、且つ、該蓄積シートの外層に該シート厚みより0.5
倍以上の厚さの該外層と同種の樹脂を射出整形した積層
整形された平板プリフォームが有効であることを見い出
し、ポリプロピレン系樹脂を主構成とする射出、延伸容
器成形方法において、高強度で透明性に優れたガスバリ
ヤ性を有する多層容器の製造方法を提供することが出来
た。The present inventors have conducted various studies on a method for producing a multi-layer container having a gas barrier property with high strength and excellent transparency,
A laminated sheet having a gas barrier property mainly composed of polypropylene resin and a method of injection and stretching container molding are combined, and the outer layer of the accumulation sheet has a thickness of 0.5 from the sheet thickness.
It was found that a laminated shaped flat plate preform obtained by injection-molding the same kind of resin as the outer layer having a thickness of more than twice is effective, and in the injection and stretch container molding method mainly composed of polypropylene resin, with high strength. It has been possible to provide a method for producing a multi-layer container having excellent transparency and gas barrier properties.
本発明は、外層及び内層はポリプロピレン系樹脂、中間
層はエチレン・酢酸ビニル共重合体けん化樹脂から成る
積層シートを金型に挿入し、該シートの外層に該シート
厚みより0.5倍以上の厚さの該外層と同種の樹脂を射出
成形し、その積層成形された平板ポリフォールを延伸、
延伸吹込みを行なうことを特徴とする多層容器の製造方
法に関する。The present invention, the outer layer and the inner layer is a polypropylene-based resin, the intermediate layer is a laminated sheet of ethylene-vinyl acetate copolymer saponified resin is inserted into the mold, the outer layer of the sheet 0.5 times or more thickness than the sheet thickness Injection molding a resin of the same type as the outer layer, and stretching the laminated flat plate polyfol,
The present invention relates to a method for manufacturing a multi-layer container, which is characterized in that drawing and blowing are performed.
本発明の要点は、ポリプロピレン系樹脂を主構成とする
ガスバリヤ性を有する積層シートと射出装置が１つであ
る射出、延伸容器成形方法とを組み合わせたこと且つ該
シートの外層に該シート厚みより0.5倍以上の厚さの該
外層と同種の樹脂を射出成形した積層成形された平板プ
リフォームを見い出したことである。The main point of the present invention is to combine a laminated sheet having a polypropylene resin as a main component and having a gas barrier property with an injection / stretching container molding method having one injection device, and an outer layer of the sheet having a thickness of 0.5 or less than the sheet thickness. This is to find a laminated flat plate preform in which a resin of the same type as the outer layer having a thickness of twice or more is injection-molded.
上記の相乗効果により、高強度で透明性に優れたガスバ
リヤ性を有する多層容器が得られものである。Due to the above synergistic effect, a multi-layer container having a gas barrier property with high strength and excellent transparency can be obtained.
以下、詳細に説明を行なう。第１図は、本発明の製造方
法により得られたポリプロピレン系樹脂を主構成とする
ガスバリヤ性多層容器の正断面図、第２図は本発明を製
造工程中に積層成形された平板プリフォームの正断面図
である。The details will be described below. FIG. 1 is a front sectional view of a gas barrier multi-layer container mainly composed of a polypropylene resin obtained by the manufacturing method of the present invention, and FIG. 2 is a flat plate preform laminated and molded during the manufacturing process of the present invention. FIG.
第１図において、本発明により得られた多層容器１は、
フランジ部２、薄肉の胴部３及び底部４を有し、ポリプ
ロピレン系樹脂を主構成とするガスバリヤ性を有する積
層シート部５及び射出成形されたポリプロピレン系樹脂
層６を示す。第２図は、ポリプロピレン系樹脂を主構成
とするガスバリヤ性を有する積層シート部５と射出形成
されたポリプロピレン系樹脂層６との積層成形された平
板プリフォームを示し、ポリプロピレン系樹脂を主構成
とするガスバリヤ性を有する積層シート部５の構成の一
例を示し、外層７はポリプロピレン系樹脂、内層８はポ
リプロピレン系樹脂、中間層９はエチレン・酢酸ビニル
共重合体けん化物樹脂であり、ポリプロピレン系樹脂と
エチレン・酢酸ビニル共重合体けん化物樹脂は熱融着を
しないので、それらの接着樹脂層として１０及び１１の
構成を有する積層シート部５である。In FIG. 1, the multilayer container 1 obtained by the present invention is
A laminated sheet portion 5 having a flange portion 2, a thin body portion 3 and a bottom portion 4 and having a gas barrier property mainly composed of polypropylene resin and an injection molded polypropylene resin layer 6 are shown. FIG. 2 shows a laminated flat plate preform composed of a laminated sheet portion 5 mainly composed of polypropylene resin and having gas barrier properties, and a polypropylene resin layer 6 formed by injection molding. Shows an example of the structure of the laminated sheet portion 5 having a gas barrier property, wherein the outer layer 7 is a polypropylene resin, the inner layer 8 is a polypropylene resin, and the intermediate layer 9 is an ethylene / vinyl acetate copolymer saponified resin. Since the saponified ethylene / vinyl acetate copolymer resin does not undergo heat fusion, it is the laminated sheet portion 5 having the configurations of 10 and 11 as the adhesive resin layers thereof.
本発明は、ポリプロピレン系樹脂を主構成とするガスバ
リヤ性を有する積層シート部５を射出成形用金型に挿入
し該シートの外層７に該シート厚みより、0.5倍以上の
厚さの該外層７と同種のポリプロピレン系樹脂を射出成
形し、その積層成形された平板プリフォームを延伸、延
伸吹込みを行なうことを特徴とする多層容器の製造方法
である。According to the present invention, a laminated sheet portion 5 mainly composed of polypropylene resin and having a gas barrier property is inserted into an injection molding die, and the outer layer 7 of the sheet is 0.5 times or more thicker than the sheet thickness. The method for producing a multi-layer container is characterized in that the same type of polypropylene resin is injection-molded, and the laminated flat plate preform is stretched and stretch-blown.
第１図及び第２図において、ポリプロピレン系樹脂を主
構成とするガスバリヤ性を有する積層シート部５及び射
出成形されたポリプロピレン系樹脂層６が、多層容器と
しては必要な層間接着強度を得る熱接着をするために
は、予め金型に挿入するポリプロピレン系樹脂を主構成
とするガスバリヤ性を有する積層シートの該シート厚み
より、0.5倍以上の厚さの該外層と同種のポリプロピレ
ン系樹脂層を射出することが必要である。In FIG. 1 and FIG. 2, the laminated sheet portion 5 mainly composed of polypropylene resin and having a gas barrier property and the injection-molded polypropylene resin layer 6 are heat-bonded to obtain the interlayer adhesive strength required for a multilayer container. In order to do so, a polypropylene resin layer of the same kind as the outer layer having a thickness of 0.5 times or more is injected from the sheet thickness of the laminated sheet having a gas barrier property, which is mainly composed of polypropylene resin to be inserted into a mold in advance. It is necessary to.
即ち、第２図において、ポリプロピレン系樹脂を主構成
とするガスバリヤ性を有する積層シートの厚みをｘとす
るとそのシートの外層に射出成形する同種のポリプロピ
レン系樹脂層の厚さｙは0.5ｘ以上の肉厚が必要である
ことが判明し、ポリプロピレン系樹脂層の厚さｙが0.5
ｘ未満の場合には、ポリプロピレン系樹脂を主構成とす
るガスバリヤ性を有する積層シートとそのシートの外層
に射出成形する同種のポリプロピレン樹脂層とが充分に
接着しないので、ガスバリヤ性を有する多層容器として
は不都合であることが判明した。That is, in FIG. 2, assuming that the thickness of the laminated sheet having a polypropylene resin as a main component and having a gas barrier property is x, the thickness y of the polypropylene resin layer of the same kind to be injection-molded on the outer layer of the sheet is 0.5x or more. It was found that a wall thickness is required, and the thickness y of the polypropylene resin layer is 0.5
When it is less than x, the laminated sheet having a gas barrier property mainly composed of polypropylene resin and the polypropylene resin layer of the same kind which is injection-molded on the outer layer of the sheet are not sufficiently adhered to each other, so that a multilayer container having a gas barrier property is obtained. Turned out to be inconvenient.
尚、第２図の積層成形された平板プリフォームの形状
は、多層容器の形状により異なり、円盤、正方形、長方
形、楕円形等種々の形状を有するものである。The shape of the laminated flat plate preform shown in FIG. 2 varies depending on the shape of the multilayer container and has various shapes such as a disc, a square, a rectangle, and an ellipse.
第３図は本発明の製造方法の積層成形された平板プリフ
ォーム製造の説明用正断面図、第４図は本発明の延伸工
程説明用正断面図、第５図は本発明の延伸吹込み工程説
明用断面図である。FIG. 3 is a front sectional view for explaining the production of the laminated flat plate preform of the manufacturing method of the present invention, FIG. 4 is a front sectional view for explaining the stretching step of the present invention, and FIG. 5 is a stretch blowing of the present invention. It is sectional drawing for process description.
第３図において、金型キャビテイ１２内へ外層及び内層
がポリプロピレン系樹脂、中間層は、エチレン・酢酸ビ
ニル共重合体けん化物樹脂から成る積層シート即ちポリ
プロピレン系樹脂を主構成とするガスバリヤ性を有する
積層シート部５を挿入する。In FIG. 3, an outer layer and an inner layer are polypropylene resins in the mold cavity 12, and an intermediate layer is a laminated sheet of ethylene / vinyl acetate copolymer saponified resin, that is, a gas barrier property mainly composed of polypropylene resin. The laminated sheet portion 5 is inserted.
その後、該シートの外層側へ同種のポリプロピレン系樹
脂層６をポリプロピレン系樹脂を主構成とするガスバリ
ヤ性を有する積層シートの厚みより0.5倍以上の厚みに
て射出成形を行なう。Thereafter, the same type of polypropylene resin layer 6 is injection-molded on the outer layer side of the sheet at a thickness of 0.5 times or more than the thickness of the laminated sheet having a gas barrier property mainly composed of polypropylene resin.
射出成形は、ポリプロピレン系樹脂１３を溶融させたも
のを射出シリンダー１４にて、ゲート１５から金型キャ
ビティ１２内へ射出を行ない、射出成形されたポリプロ
ピレン系樹脂層６とするが、射出成形時に溶融樹脂の所
有する熱量にて予め金型内へ挿入したポリプロピレン系
樹脂を主構成とするガスバリヤ性を有するシート部５と
熱接着し、その積層成形されたものは平板プリフォーム
１６となる。金型キャビテイ１２の温度は、70〜 120℃
に設定しておき、射出成形されたポリプロピレン系樹脂
層６が冷却固化された段階で、次工程の延伸を行なう。In injection molding, a melted polypropylene resin 13 is injected from the gate 15 into the mold cavity 12 by the injection cylinder 14 to form the injection molded polypropylene resin layer 6, which is melted at the time of injection molding. The sheet part 5 having a gas barrier property mainly composed of polypropylene resin, which is inserted into the mold in advance by the amount of heat possessed by the resin, is heat-bonded to form a flat plate preform 16. The temperature of the mold cavity 12 is 70 ~ 120 ℃
And when the injection-molded polypropylene resin layer 6 is cooled and solidified, the stretching in the next step is performed.
第４図において、70〜90℃に温度設定された多層容器形
状金型１７の上へ平板プリフォームを置き、プリフォー
ム固定具１９にて平板プリフォームを固定した後、延伸
プラグ１８にて、平板プリフォーム内層部を押して延伸
を行なう。延伸プラグ１８の先端は半球状であることが
望ましいが、かならずしも固執するものではない。その
後第５図に示す如く延伸吹込みを行なうが、延伸吹込み
は、第４図に示す延伸とほぼ同タイミングで行なうこと
が望ましい。延伸吹込みは、圧力を有する熱風を吹込む
が、熱風温度は70〜 140℃が望ましい。熱風圧力は、延
伸の状況に応じて適宜変更可能である。延伸吹込み後、
延伸プラグ１８を抜き取り、プリフォーム固定具１９を
取り除き、多層容器形状金型１７から成形加工された多
層容器１を取り出す。この多層容器は、高強度で透明性
に優れたガスバリヤ性を有する多層容器となる。In FIG. 4, the flat plate preform is placed on the multilayer container-shaped mold 17 whose temperature is set to 70 to 90 ° C., the flat plate preform is fixed by the preform fixture 19, and then the stretch plug 18 is used. Stretching is performed by pressing the inner layer portion of the flat plate preform. It is desirable that the tip of the extension plug 18 be hemispherical, but it is not always adhered. Thereafter, as shown in FIG. 5, stretch blowing is performed, but it is desirable that the stretch blowing be performed at substantially the same timing as the stretching shown in FIG. In the drawing blow, hot air having a pressure is blown, and the hot air temperature is preferably 70 to 140 ° C. The hot air pressure can be appropriately changed depending on the stretching condition. After stretching and blowing,
The drawn plug 18 is pulled out, the preform fixture 19 is removed, and the molded multilayer container 1 is taken out from the multilayer container shape mold 17. This multi-layer container is a multi-layer container having high strength and excellent gas transparency with excellent transparency.
本発明の製造方法により得られた多層容器は、前述した
ように高強度で透明性に優れ、且つガスバリヤ性を有す
ることから種々の内容物に対する容器として有用であ
り、例えばビール、コーラー、サイダー、炭酸入り果汁
飲料、炭酸入り酒精飲料等の容器として利用することが
出来る。The multilayer container obtained by the production method of the present invention is useful as a container for various contents because it has high strength and excellent transparency as described above, and has gas barrier properties, for example, beer, cola, cider, It can be used as a container for carbonated fruit juice beverages, carbonated alcoholic beverages and the like.
以下実施例及び比較例（第１表）で説明する。実施例１
〜２及び比較例１において、外層及び内層はポリプロピ
レン系樹脂、中間層はエチレン・酢酸ビニル共重合体け
ん化物樹脂から成る積層シートを４台の押出機を使用し
て、共押出成形方法にて、積層シートをつくる。Examples and comparative examples (Table 1) will be described below. Example 1
2 and Comparative Example 1, the outer layer and the inner layer were made of polypropylene resin, and the intermediate layer was made of ethylene / vinyl acetate copolymer saponified resin. , Make a laminated sheet.
次いで、この積層シートを、内容積300cc のコップ容器
形状の金型を有する射出延伸容器成形機の金型に挿入
し、該シートの外層に所定の樹脂にて所定の厚さの樹脂
量を射出成形を行ない平板プリフォームを得る。Then, this laminated sheet is inserted into a die of an injection stretch container molding machine having a cup container-shaped die having an inner volume of 300 cc, and a predetermined amount of resin is injected into the outer layer of the sheet with a predetermined resin. Molding is performed to obtain a flat plate preform.
さらに、その平板プリフォームを延伸及び延伸吹込みを
行ないコップ形状の多層容器を得る。その後性能評価を
行なう。性能評価は、光線透過率（ＪＩＳ−Ｋ６７１
４）及び酸素ガスバリヤ性（ＡＳＴＭ−Ｄ−１４３４に
準拠し、２０℃乾燥状態での測定値）及び落下衝撃試験
（炭酸飲料を充填し、高さ１ｍから床面への落下衝撃）
を行なう。Further, the flat plate preform is stretched and stretch-blown to obtain a cup-shaped multilayer container. After that, performance evaluation is performed. Performance evaluation is based on light transmittance (JIS-K671).
4) and oxygen gas barrier property (measured value in a dry state at 20 ° C. according to ASTM-D-1434) and drop impact test (filling carbonated beverage, drop impact from height 1 m to floor surface).
Do.
なお実施例及び比較例に使用した樹脂は、 PP-1ポリプロピレン 住友化学・ノ-ブレンD-501 PP-2 〃 住友化学・ノ-ブレンS-101 PP-3 〃 三井石油化学・ポリプロB200 PP-4 〃 三井石油化学・ポリプロB230 PP-5 〃 三井石油化学・ポリプロJ730 Ad-1接着性ポリマー 三菱油化・モデイックE-200H Ad-2 〃 三菱油化・モデイックL-400H EVOHエチレン酢酸ビニルクラレ・エバール 共重合体けん化物 実施例１及び実施例２において得られ多層容器は、光線
透過率90％以上、酸素ガスバリヤ性１．０cc／M2・24hr
・atm 以下（シート換算）であり、落下衝撃試験におい
ても、容器の層間剥離及び底部破損は認められず、これ
らの多層容器は、高強度で透明性に優れたガスバリヤ性
を有する多層容器である。The resins used in the examples and comparative examples were PP-1 polypropylene Sumitomo Chemical No-Blen D-501 PP-2 〃 Sumitomo Chemical No-Blen S-101 PP-3 〃 Mitsui Petrochemical Polypro B200 PP- 4 〃 Mitsui Petrochemical / Polypro B230 PP-5 〃 Mitsui Petrochemical / Polypro J730 Ad-1 Adhesive Polymer Mitsubishi Petrochemical / Modic E-200H Ad-2 〃 Mitsubishi Petrochemical / Modic L-400H EVOH Ethylene Vinyl Acetate Kuraray / Eval Saponified Copolymer The multilayer containers obtained in Examples 1 and 2 have a light transmittance of 90% or more and an oxygen gas barrier property of 1.0 cc / M 2 · 24 hr.
・ Atm or less (sheet equivalent), no delamination or bottom damage of the container was observed even in the drop impact test, and these multi-layer containers are high-strength, highly transparent multi-layer containers with gas barrier properties. .
比較例１において得られた多層容器は、光線透過率及び
酸素ガスバリヤ性は良好であるが、落下衝撃試験では、
容器に層間剥離が認められ、多層容器としては不都合で
ある。The multilayer container obtained in Comparative Example 1 has good light transmittance and oxygen gas barrier property, but in the drop impact test,
Delamination was observed in the container, which is inconvenient for a multilayer container.
比較例２においては、ガスバリヤ性を有するポリプロピ
レン系樹脂を主構成とする複合シートを４台の押出機に
より、共押出成形方法でつくり、該複合シートを真空成
形方法にて内容積300cc のコップ容器形状の多層容器を
成形し、その後上述の性能評価を行なう。光線透過率は
70％、酸素ガスバリヤ性5.0cc／M2・24hr・atm と悪
く、落下衝撃試験においても容器に底部破損が認めら
れ、多層容器としては、不都合である。In Comparative Example 2, a composite sheet mainly composed of polypropylene resin having gas barrier property was made by four extruders by a coextrusion molding method, and the composite sheet was vacuum formed by a cup container having an internal volume of 300 cc. A shaped multi-layer container is molded, and then the above performance evaluation is performed. The light transmittance is
70%, oxygen gas barrier property is 5.0cc / M 2 · 24hr · atm, which is bad, and damage to the bottom of the container was observed even in the drop impact test, which is inconvenient for a multilayer container.
第１図は、本発明の製造方法により得られたポリプロピ
レン系樹脂を主構成とするガスバリヤ性多層容器の正断
面図、第２図は本発明の製造工程中に積層成形された平
板プリフォームの正断面図、第３図は本発明の製造方法
の積層成形された平板プリフォーム製造の説明用正断面
図、第４図は本発明の延伸工程説明用正断面図、第５図
は本発明の延伸吹込み工程説明用正断面図である。 １……本発明により得られた多層容器 ２……フランジ部 ３……薄肉の胴部 ４……底部 ５……ポリプロピレン系樹脂を主構成とするガスバリヤ
性を有する積層シート部 ６……射出成形されたポリプロピレン系樹脂層 ７……ポリプロピレン系樹脂外層 ８……ポリプロピレン系樹脂層内層 ９……エチレン・酢酸ビニル共重合体けん化物樹脂層 １０、１１……接着樹脂層 １２……射出成形金型キャビティ １３……ポリプロピレン系樹脂 １４……射出スクリュー １５……ゲート １６……平板プリフォーム １７……多層容器形状金型 １８……延伸プラグ １９……プリフォーム固定具FIG. 1 is a front sectional view of a gas barrier multi-layer container mainly composed of a polypropylene resin obtained by the production method of the present invention, and FIG. 2 is a flat plate preform laminated and molded during the production process of the present invention. Front sectional view, FIG. 3 is a front sectional view for explaining the production of the laminated flat plate preform of the manufacturing method of the present invention, FIG. 4 is a front sectional view for explaining the stretching step of the present invention, and FIG. 5 is the present invention. FIG. 3 is a front cross-sectional view for explaining the stretching and blowing step of FIG. 1 ... Multilayer container obtained by the present invention 2 ... Flange part 3 ... Thin body part 4 ... Bottom part 5 ... Laminated sheet part mainly composed of polypropylene resin and having gas barrier property 6 ... Injection molding Polypropylene resin layer 7 …… Polypropylene resin outer layer 8 …… Polypropylene resin layer inner layer 9 …… Ethylene / vinyl acetate copolymer saponified resin layer 10, 11 …… Adhesive resin layer 12 …… Injection mold Cavity 13 Polypropylene resin 14 Injection screw 15 Gate 16 Flat plate preform 17 Multilayer container shape mold 18 Extending plug 19 Preform fixture
Claims (1)
間層はエチレン・酢酸ビニル共重合体けん化物樹脂から
成る積層シートを金型に挿入し、該シートの外層に該シ
ート厚みより０．５倍以上の厚さの該外層と同種のポリ
プロピレン系樹脂層を射出成形し、その積層成形された
平板プリフォームを延伸、延伸吹込みを行なうことを特
徴とする多層容器の製造方法。1. A laminated sheet comprising a polypropylene resin as an outer layer and an inner layer and an ethylene / vinyl acetate copolymer saponified resin as an intermediate layer is inserted into a mold, and the outer layer of the sheet is 0.5 times as thick as the sheet thickness. A method for producing a multi-layer container, characterized in that a polypropylene resin layer of the same thickness as the outer layer having the above thickness is injection-molded, and the laminated flat plate preform is stretched and stretch-blown.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62116965A JPH0615198B2 (en) | 1987-05-15 | 1987-05-15 | Method for manufacturing multi-layer container |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62116965A JPH0615198B2 (en) | 1987-05-15 | 1987-05-15 | Method for manufacturing multi-layer container |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63281825A JPS63281825A (en) | 1988-11-18 |
| JPH0615198B2 true JPH0615198B2 (en) | 1994-03-02 |
Family
ID=14700131
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62116965A Expired - Lifetime JPH0615198B2 (en) | 1987-05-15 | 1987-05-15 | Method for manufacturing multi-layer container |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0615198B2 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5337766A (en) * | 1976-09-20 | 1978-04-07 | Dainippon Printing Co Ltd | Method of producing multiiwall container |
| JPS5339377A (en) * | 1976-09-22 | 1978-04-11 | Sekisui Chemical Co Ltd | Process for making containers |
| GB2070504A (en) * | 1980-02-29 | 1981-09-09 | Huhtamaeki Yhthymae Oy | Procedure for manufacturing a plastics container |
-
1987
- 1987-05-15 JP JP62116965A patent/JPH0615198B2/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5337766A (en) * | 1976-09-20 | 1978-04-07 | Dainippon Printing Co Ltd | Method of producing multiiwall container |
| JPS5339377A (en) * | 1976-09-22 | 1978-04-11 | Sekisui Chemical Co Ltd | Process for making containers |
| GB2070504A (en) * | 1980-02-29 | 1981-09-09 | Huhtamaeki Yhthymae Oy | Procedure for manufacturing a plastics container |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63281825A (en) | 1988-11-18 |
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