JPS63281825A - Manufacture of multilayered container - Google Patents
Manufacture of multilayered containerInfo
- Publication number
- JPS63281825A JPS63281825A JP11696587A JP11696587A JPS63281825A JP S63281825 A JPS63281825 A JP S63281825A JP 11696587 A JP11696587 A JP 11696587A JP 11696587 A JP11696587 A JP 11696587A JP S63281825 A JPS63281825 A JP S63281825A
- Authority
- JP
- Japan
- Prior art keywords
- layer
- outer layer
- polypropylene resin
- gas barrier
- laminated sheet
- 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.)
- Granted
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 17
- 229920005989 resin Polymers 0.000 claims abstract description 53
- 239000011347 resin Substances 0.000 claims abstract description 53
- 238000000034 method Methods 0.000 claims abstract description 20
- 238000007664 blowing Methods 0.000 claims abstract description 9
- 238000001746 injection moulding Methods 0.000 claims abstract description 7
- 239000004743 Polypropylene Substances 0.000 claims description 44
- 229920001155 polypropylene Polymers 0.000 claims description 44
- -1 polypropylene Polymers 0.000 claims description 43
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims description 4
- 239000005977 Ethylene Substances 0.000 claims description 4
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 claims description 4
- 229920006026 co-polymeric resin Polymers 0.000 claims description 4
- 230000004888 barrier function Effects 0.000 abstract description 34
- 238000002347 injection Methods 0.000 abstract description 22
- 239000007924 injection Substances 0.000 abstract description 22
- 239000005038 ethylene vinyl acetate Substances 0.000 abstract description 4
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 abstract description 4
- 229920005673 polypropylene based resin Polymers 0.000 abstract 4
- 239000010410 layer Substances 0.000 description 37
- 239000007789 gas Substances 0.000 description 28
- 238000000465 moulding Methods 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 5
- 238000009863 impact test Methods 0.000 description 4
- 239000003348 petrochemical agent Substances 0.000 description 4
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 3
- 229910001882 dioxygen Inorganic materials 0.000 description 3
- 238000002834 transmittance Methods 0.000 description 3
- 239000004840 adhesive resin Substances 0.000 description 2
- 229920006223 adhesive resin Polymers 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 241000512259 Ascophyllum nodosum Species 0.000 description 1
- 229920001342 Bakelite® Polymers 0.000 description 1
- 235000016795 Cola Nutrition 0.000 description 1
- 235000011824 Cola pachycarpa Nutrition 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000002998 adhesive polymer Substances 0.000 description 1
- 235000013334 alcoholic beverage Nutrition 0.000 description 1
- 235000013405 beer Nutrition 0.000 description 1
- DQXBYHZEEUGOBF-UHFFFAOYSA-N but-3-enoic acid;ethene Chemical compound C=C.OC(=O)CC=C DQXBYHZEEUGOBF-UHFFFAOYSA-N 0.000 description 1
- 235000014171 carbonated beverage Nutrition 0.000 description 1
- 235000019987 cider Nutrition 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 210000004709 eyebrow Anatomy 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 235000015203 fruit juice Nutrition 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 239000002648 laminated material Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000007666 vacuum forming Methods 0.000 description 1
Landscapes
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Abstract
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、ポリプロピレン系用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。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method for manufacturing a multilayer container having high strength, excellent transparency, and gas barrier properties, and is particularly useful for maintaining the freshness of foods and preventing quality changes. This is a method for manufacturing a multilayer container for injection-stretched containers, which can manufacture a multilayer container mainly composed of polypropylene resin and having gas barrier properties using one 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 manufacturing method for a multilayer container with gas barrier properties mainly composed of polypropylene resin, a laminated sheet mainly composed of polypropylene resin with gas barrier properties is formed into a container shape by vacuum forming method or vacuum pressure forming method. A method of molding is being used. However, the multilayer containers obtained by these molding methods have low strength and poor transparency, and cannot be used satisfactorily as containers.
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つ以上存する
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 container molding methods that involve injection molding, stretching, and stretch blowing have been used, the injection stretch multilayer container molding method that uses two or more injection devices requires a complicated mechanism and high equipment costs. There are problems such as high cost, and it has not been possible to obtain a multilayer container with gas barrier properties mainly composed of polypropylene resin.
（発明の目的〕
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、該積層シートの外層に１亥シート厚みより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。(Purpose of the Invention) The present inventors have conducted various studies on a method for manufacturing a multilayer container with high strength, excellent transparency, and gas barrier properties.
A laminated sheet with gas barrier properties mainly composed of polypropylene resin is combined with injection and stretch container molding methods, and the outer layer of the laminated sheet is made of 100% less than the sheet thickness.
．． It was discovered that a laminated flat plate preform made by injection molding of the same type of resin as the outer layer with a thickness of 5 times or more is effective. We were able to provide a method for manufacturing a multilayer container with 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
造方法に関する。In the present invention, a laminated sheet consisting of a polypropylene resin for the outer and inner layers and a saponified ethylene/vinyl acetate copolymer resin for the intermediate layer is inserted into a mold, and the outer layer of the sheet is 0.5 times or more thicker than the sheet thickness. The present invention relates to a method for producing a multilayer container, which comprises injection molding the same type of resin as the outer layer, and stretching and stretch blowing the laminated flat plate preform.
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 key points of the present invention are that a laminated sheet with gas barrier properties mainly composed of polypropylene resin is combined with an injection and stretch container molding method using one injection device, and that the outer layer of the sheet has a thickness that is less than 0. We have discovered a laminated flat plate preform in which the same type of resin as the outer layer is injection molded and is 5 times or more thick.
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たものである。Due to the synergistic effect described above, a multilayer container having high strength, excellent transparency, and gas barrier properties was 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
である。A detailed explanation will be given below. FIG. 1 is a front cross-sectional view of a gas barrier multilayer container mainly composed of polypropylene resin obtained by the manufacturing method of the present invention, and FIG. FIG. 3 is a front cross-sectional view of a laminated flat plate preform.
第１図において、本発明により得られた多層容器ｌ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存する積
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と射出成形
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、それらの接着樹脂層としてｌ
Ｏ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 l obtained by the present invention is
FIG. 2 shows a laminated sheet part 5 having a flange part 2, a thin body part 3 and a bottom part 4, and having gas barrier properties mainly composed of polypropylene resin, and an injection molded polypropylene resin layer 6. It shows a flat plate preform formed by laminating a laminated sheet part 5 having gas barrier properties mainly composed of polypropylene resin and an injection molded polypropylene resin layer 6, which has gas barrier properties mainly composed of polypropylene resin. An example of the structure of the laminated sheet portion 5 is shown, in which the outer layer 7 is made of polypropylene resin, the inner layer 8 is made of polypropylene resin, and the intermediate layer 9 is made of saponified ethylene/vinyl acetate copolymer resin, and l is used as an adhesive resin layer for them.
This is a laminated sheet portion 5 having a configuration of O and 11.
本発明は、ポリプロピレン系樹脂を主構成とするガスバ
リヤ性を育する積層シート部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。The present invention involves inserting a laminated sheet part 5 mainly composed of polypropylene resin and developing gas barrier properties into an injection mold, and forming an outer layer 7 of the sheet with a thickness 0.5 times or more thicker than the sheet thickness. Injection molding the same type of polypropylene resin as the outer layer 7, stretching the laminated flat plate preform,
This is a method for manufacturing a multilayer container characterized by performing stretch blowing.
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 FIGS. 1 and 2, a laminated sheet portion 5 mainly composed of polypropylene resin and having gas barrier properties and an injection molded polypropylene resin layer 6 are bonded together by thermal bonding to obtain the interlayer adhesive strength necessary for a multilayer container. In order to
It is necessary to inject a polypropylene resin layer of the same type as the outer layer that is 0.5 times or more thicker than the sheet thickness of the laminated sheet with gas barrier properties mainly composed of polypropylene resin inserted into the mold in advance. It is.
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
．５ｘ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, if the thickness of a laminated sheet with gas barrier properties mainly composed of polypropylene resin is X, then the thickness y of the same type of polypropylene resin layer injection molded on the outer layer of the sheet is 0.5x or more. It was found that the thickness of the polypropylene resin layer was 0.
．． If it is less than 5x, the laminated sheet with gas barrier properties mainly composed of polypropylene resin and the same type of polypropylene resin layer injection molded on the outer layer of the sheet will not adhere sufficiently, so it will not be possible to use it as a multilayer container with gas barrier properties. proved 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
、楕円形等積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 a stacked shape such as a disk, square, rectangle, and oval.
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図は本発明の詳細な
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。FIG. 3 is a front cross-sectional view for explaining the production of a laminated flat plate preform according to the manufacturing method of the present invention, FIG. 4 is a front cross-sectional view for detailed explanation of the present invention, and FIG. It is a front sectional view for process explanation.
第３図において、金型キャビティ１２内へ外層る積層シ
ート部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 laminated sheet portion 5 having gas barrier properties mainly composed of polypropylene resin is inserted into the mold cavity 12.
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, a polypropylene resin layer 6 of the same type is injection molded onto the outer layer side of the sheet to a thickness that is 0.5 times or more greater than the thickness of the laminate sheet having gas barrier properties 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。金型キャビティ１２の温度は、７０〜１２
０℃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 polypropylene resin 13 is melted and injected into the mold cavity 12 through a gate 15 using an injection cylinder 14 to form an injection molded polypropylene resin layer 6. It is thermally bonded to a sheet portion 5 having gas barrier properties mainly composed of a polypropylene resin which has been inserted into a mold in advance using the amount of heat possessed by the resin, and the resulting laminated material becomes a flat plate preform 16. The temperature of the mold cavity 12 is between 70 and 12
The temperature is set at 0° C., and the next step of stretching is performed when the injection molded polypropylene resin layer 6 is cooled and solidified.
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図に示す延伸プラグでの延伸とほぼ同タイ
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１
７から成形加工された多層容器ｌ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, a flat plate preform is placed on a multilayer container-shaped mold 17 whose temperature is set at 70 to 90°C, and after fixing the flat plate preform with a preform fixture 19,
The stretching plug 18 pushes the inner layer of the flat plate preform to perform stretching. The tip of the stretching plug 18 is preferably semispherical, but it is not necessarily fixed.
Thereafter, stretch blowing is performed as shown in FIG. 5. It is desirable to perform stretch blowing at approximately the same timing as the stretching with the stretch plug shown in FIG. 4. However, the hot air temperature is preferably 70 to 140°C, and the hot air pressure can be changed as appropriate depending on the stretching situation. After stretching and blowing, the stretching plug 18 is pulled out, the preform fixture 19 is removed, and the multilayer container shape mold 1 is removed.
The molded multilayer container l is taken out from step 7. This multilayer container has high strength, excellent transparency, and gas barrier properties.
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−、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。Due to its barrier properties, it is useful as a container for various contents, such as beer, cola, cider,
It can be used as a container for carbonated fruit juice drinks, carbonated alcoholic beverages, etc.
（実 施 例〕 以下実施例及び比較例（第１表）で説明する。(Example〕 This will be explained below using Examples and Comparative Examples (Table 1).
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
。In Examples 1 to 2 and Comparative Example 1, a laminated sheet consisting of a polypropylene resin for the outer and inner layers and a saponified ethylene/vinyl acetate copolymer resin for the intermediate layer was coextruded using four extruders. A laminated sheet is made using this method.
次いで、この積層シートを、内容積３００ｃｃのコツプ
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。Next, this laminated sheet was inserted into the mold of an injection stretch container molding machine having a mold in the shape of a pot with an internal volume of 300 cc, and a predetermined amount of resin was injected into the outer layer of the sheet to a predetermined thickness. 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
行ないコツ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−に６７１４
）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から床面への落下面ｌりを
行なう。Further, the flat preform is stretched and stretch-blown to obtain a cup-shaped multilayer container. After that, performance evaluation is performed.The performance evaluation is based on the light transmittance (JIS-6714
), oxygen gas barrier property (according to ASTM-D-1434, measured value in a dry state at 20°C) and drop impact test (
Fill the container with carbonated beverages and drop it from a height of 1 m to the floor.
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・ｌ−ブレンＤ−５０１ＰＰ−２
＃ 住友化学・ノーブレンＳ−１０１
ＰＰ−３三井石油化学・ギリブｎＢ２００ＰＰ−４三井
石油化学・ボリブｏＢ２３０ＰＰ−５三井石油化学・ポ
リブＩＩＩＪ７３０Ａｄ−１接着性ポリマー 三菱油化
・壬ディマクＥ−２００ＨＡｄ−２＃
三菱油化・毫ダイフクＬ−４００ＥＶＯＨ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において得られた多層容器は、光
線透過率９０％以上、酸素ガスバリヤ性１、０ ｃｃ／
Ｍ” ・２４ｈｒ−ａｔ＋ｍ以下（シート換算）であ
り、落下衝撃試験においても、容器の眉間剥離及び底部
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 resin used in the examples and comparative examples was PP-1 polypropylene Sumitomo Chemical l-Blen D-501PP-2
# Sumitomo Chemical Noblen S-101
PP-3 Mitsui Petrochemicals/Giribu nB200PP-4 Mitsui Petrochemicals/Bolibu oB230PP-5 Mitsui Petrochemicals/Polibu IIIJ730Ad-1 Adhesive polymer Mitsubishi Petrochemicals/Mibu Dimac E-200HAd-2#
Mitsubishi Yuka/Kadaifuku L-400EVOH ethylene vinyl acetate Kuraray/Eval copolymer saponified product The multilayer containers obtained in Examples 1 and 2 had a light transmittance of 90% or more and an oxygen gas barrier property of 1.0 cc/
M"・24hr-at+m or less (sheet equivalent), and no peeling or damage to the bottom of the container was observed in the drop impact test, and these multilayer containers have high strength and gas barrier properties with excellent transparency. It is a multilayer container.
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、
容器に眉間剥離が認められ、多層容器としては不都合で
ある。The multilayer container obtained in Comparative Example 1 had good light transmittance and oxygen gas barrier properties, but in the drop impact test,
Peeling between the eyebrows was observed on the container, which is inconvenient as 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のコンブ容器形状の多層容
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５．０ ｃｃ／ Ｍ”
・２４ｈｒ−ａｔｅ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 properties was produced using a co-extrusion molding method using four extruders, and the composite sheet was molded into a kelp container with an internal volume of 300 cc using a vacuum molding method. A multilayer container with a shape of
・The container had a poor shelf life of 24 hours, 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図は本発明の詳細な説明用正断面図、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
１Ｏ２１１・・・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
特許出願人 住友ベークライト株式会社第１図
第２図
第３図
第４図Figure 1 is a front cross-sectional view of a gas barrier multilayer container mainly composed of polypropylene resin obtained by the manufacturing method of the present invention, and Figure 2 is a cross-sectional view of a flat plate preform laminated during the manufacturing process of the present invention. 3 is a front sectional view for explaining the production of a laminated flat plate preform by the manufacturing method of the present invention, FIG. 4 is a front sectional view for explaining the present invention in detail, and FIG. 5 is a front sectional view for explaining the present invention. It is a front sectional view for explaining the stretch blowing process. 1...Multilayer container obtained by the present invention 2...Flange part 3...Thin body part 4...Bottom part 5...Laminated sheet part having gas barrier properties mainly composed of polypropylene resin 6... Injection molded polypropylene resin layer 7... Polypropylene resin outer layer 8... Polypropylene resin inner layer 9... Ethylene-vinyl acetate copolymer saponified resin layer 1O211... Adhesive resin Layer 12...Injection mold cavity 13...Polypropylene resin 14...Injection screw 15...Gate 16...Flat preform 17...Multilayer container-shaped mold 18...Stretch plug 19... Preform fixing device patent applicant Sumitomo Bakelite Co., Ltd. Figure 1 Figure 2 Figure 3 Figure 4
Claims (1)
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。A laminated sheet consisting of a polypropylene resin for the outer and inner layers and a saponified ethylene/vinyl acetate copolymer resin for the middle layer is inserted into a mold, and the outer layer of the sheet is coated with a layer having a thickness of at least 0.5 times the thickness of the sheet. A method for manufacturing a multilayer container, which comprises injection molding a polypropylene resin layer of the same type as the outer layer, stretching the laminated flat plate preform, and performing stretch blowing.
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 true JPS63281825A (en) | 1988-11-18 |
| JPH0615198B2 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 |
|---|---|
| JPH0615198B2 (en) | 1994-03-02 |
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