JP2004345300A - Method for manufacturing high barrier plastic cup-like container - Google Patents

Method for manufacturing high barrier plastic cup-like container Download PDF

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Publication number
JP2004345300A
JP2004345300A JP2003147325A JP2003147325A JP2004345300A JP 2004345300 A JP2004345300 A JP 2004345300A JP 2003147325 A JP2003147325 A JP 2003147325A JP 2003147325 A JP2003147325 A JP 2003147325A JP 2004345300 A JP2004345300 A JP 2004345300A
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JP
Japan
Prior art keywords
container
heat
high barrier
peripheral wall
label
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
Application number
JP2003147325A
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Japanese (ja)
Inventor
Tadasuke Kojima
忠祐 小嶋
Tsutomu Tsuchida
勉 土田
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Toppan Printing Co Ltd
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Toppan Printing Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toppan Printing Co Ltd filed Critical Toppan Printing Co Ltd
Priority to JP2003147325A priority Critical patent/JP2004345300A/en
Publication of JP2004345300A publication Critical patent/JP2004345300A/en
Pending legal-status Critical Current

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14778Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the article consisting of a material with particular properties, e.g. porous, brittle
    • B29C45/14811Multilayered articles

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a high barrier plastic cup-like container which does not spoil appearance and barrier properties, has heat resistance and pressure resistance, and can be used in a microwave oven. <P>SOLUTION: The plastic cup-like container 100b with a shape of an inverted truncated cone has a flange 110 for heat-fusing a sealing film on the upper end outer periphery and heat-fuses high barrier labels 140 on the outer peripheral face of the peripheral wall 120 and the underside of a bottom wall 130. The method of manufacturing the container 100b comprises the first stage wherein a high barrier label 140a for the peripheral wall is temporarily stuck on the peripheral wall cavity face in advance in a mold for injection molding, and at the same time when the container is injection-molded, the high barrier label for the peripheral wall is heat-fused on the outer face of the peripheral wall, and the second stage wherein a high barrier label 140b for the bottom wall is heat-fused by a heat-fusion method on the underside of the bottom wall of the container on the outer face of the peripheral wall of which the high barrier label is heat-fused. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【0001】
【発明の属する技術分野】
本発明は、飲料、食品などに用いるハイバリヤ性プラスチックカップ状容器の製造方法に関するものである。
【0002】
【従来の技術】
従来、酸素により色、風味、香りなどが変化しやすい内容物に用いられるプラスチックカップ状容器には、インサート射出成形法により容器を射出成形すると同時に、容器の周壁外周や底壁下面にハイバリヤ性ラベルを熱融着したハイバリヤ性プラスチックカップ状容器が使用されていた。
【0003】
【発明が解決しようとする課題】
しかしながら、上述の従来のハイバリヤ性プラスチックカップ状容器においては、容器が大きくなるにつれて、発明者らのこれまでの経験的な知見によると、例えば口径が71mmで、全高が105mm以上では、容器のインサート射出成形時に、ハイバリヤ性ラベルの巻き込み、折れ、曲がり、樹脂被りなどが発生しやすく、この結果、外観性やバリヤ性が損なわれ、生産収率や商品価値が著しく低下した。また、内容物を高温高圧殺菌する場合には、耐熱及び耐圧性が著しく低下することがあった。なお、最近では、電子レンジ適性も求められるようになってきた。
【0004】
本発明は、上述の従来のハイバリヤ性プラスチックカップ状容器の製造方法における問題を解決したものであり、大型でも外観性やバリヤ性を損なうことがなく、耐熱及び耐圧性があり、電子レンジでも使用可能なハイバリヤ性プラスチックカップ状容器の製造方法を提供するものである。
【0005】
【課題を解決するための手段】
すなわち、本発明の第1の発明は、上端外周に封止フィルムを熱融着するためのフランジを有し、周壁外周面と底壁下面にハイバリヤ性ラベルを熱融着した倒立切断直円錐状のプラスチックカップ状容器の製造方法において、第一段階で、前もって射出成形用金型内に周壁用ハイバリヤ性ラベルを周壁キャビティー面に仮接着し、容器を射出成形すると同時に、前記容器の周壁外周面に前記周壁用ハイバリヤ性ラベルを熱融着し、第二段階で、前記周壁外周面に周壁用ハイバリヤ性ラベルを熱融着する容器の底壁下面に、底壁用ハイバリヤ性ラベルを熱融着法により熱融着したことを特徴とするハイバリヤ性プラスチックカップ状容器の製造方法である。
【0006】
そして、本発明の第2の発明は、前記ラベルのバリヤ層が、蒸着フィルム層であることを特徴とする請求項1記載のハイバリヤ性プラスチックカップ状容器の製造方法である。
【0007】
【発明の実施の形態】
次に、本発明のハイバリヤ性プラスチックカップ状容器の製造方法の実施の形態について、図を用いて詳細に説明する。
図1(a)は、本発明の一実施形態のハイバリヤ性プラスチックカップ状容器の製造方法の第一段階で作製した容器の断面図であり、図1(b)は、第二段階で作製した容器の断面図である。図2は、他の一実施形態のハイバリヤ性プラスチックカップ状容器の断面図であり、図3は、ハイバリヤ性ラベルの一実施形態の構成を示す説明図である。
【0008】
本発明の製造方法により作製されるハイバリヤ性プラスチックカップ状容器は、上端の開口部の外周に、内容物を充填したのち、封止フィルムをヒートシール法などで熱融着して容器を封止するためのフランジを有し、周壁外周面と底壁下面にハイバリヤ性ラベルを熱融着した倒立切断直円錐状のプラスチックカップ状容器で、容器の大きさが、ほぼ、口径が71mmで、全高が105mm以上の大型容器を対象としている。容器の材質は、通常、適正な剛性をもつポリプロピレンなどの熱可塑性樹脂である。
【0009】
本発明の製造方法は、製造工程が2段階に分かれており、第1段階は、インサート射出成形法で、容器の射出成形用金型内に、前もって、周壁用ハイバリヤ性ラベルを周壁キャビティー面に仮接着し、ゲートより溶融樹脂をキャビティー内へ射出して、容器を射出成形すると同時に、図1(a)に示すように、容器の周壁(120)外周面に周壁用ハイバリヤ性ラベル(140a)を熱融着して中間段階のプラスチックカップ状容器(100a)を作製するものである。第2段階は、超音波シールや高周波シールなどの熱融着法で、第1段階で作製された周壁外周面に周壁用ハイバリヤ性ラベルを熱融着する容器の底壁(130)下面に、図1(b)に示すように、底壁用ハイバリヤ性ラベル(140b)を熱融着法で熱融着して最終段階のハイバリヤ性プラスチックカップ状容器(100b)を作製するものである。
【0010】
ゲート位置は、通常では、図1(a)に示すように、底壁の上面中央位置であるが、必要に応じては、底壁の下面中央位置でもよい。この場合には、容器の底壁の下面中央位置にゲート跡が残るため、このゲート跡を避けるために、図2に示すように、中央位置に貫通孔をもつハイバリヤ性ラベルを底壁下面に熱融着するとよい。
【0011】
ハイバリヤ性ラベルの構成は、バリヤ層として蒸着フィルム層を構成層中にもち、容器側層に容器の材質と熱融着する樹脂フィルム層(シーラント層)をもつものである。容器の材質がポリプロピレンの場合には、例えば図3に示すような<外面側>ポリプロピレン印刷フィルム層(141)(印刷基材フィルム)/印刷層(142)/蒸着層(143)/ポリエチレンテレフタレートフィルム層(144)(蒸着基材フィルム)/ポリプロピレンフィルム層(145)(シーラント層)構成のハイバリヤ性ラベルを用いるものである。なお、蒸着層としては、酸化ケイ素蒸着層やアルミナ蒸着層などである。また、印刷層は、必要に応じて設けるものである。
【0012】
上述した本発明のハイバリヤ性プラスチックカップ状容器の製造方法においては、第1段階で、周壁の外周面にハイバリヤ性ラベルを熱融着するカップ状容器をインサート射出成形法で作製し、第2段階で、第1段階で作製したカップ状容器の底壁下面にハイバリヤ性ラベルを熱融着法で熱融着したものであるので、従来のハイバリヤ性ラベルを周壁の外周面と底壁下面とに同時にインサート射出成形法で熱融着するものとは異なり、大型容器を作製しても、インサート射出成形時のハイバリヤ性ラベルの巻き込み、折れ、曲がり、樹脂被りなどの発生が極めて少なくなり、容器の外観性やバリヤ性が良好で、耐熱及び耐圧性があり、ハイバリヤ性ラベルのバリヤ層に金属箔を用いずに蒸着フィルムを用いているため、電子レンジでも使用が可能となる。
【0013】
【発明の効果】
本発明のハイバリヤ性プラスチックカップ状容器の製造方法においては、第1段階で、周壁の外周面にハイバリヤ性ラベルをインサート射出成形法により熱融着し、第2段階で、底壁の下面にハイバリヤ性ラベルを熱融着法で熱融着するものであり、比較的に大型のプラスチックカップ状容器を作製しても、ハイバリヤ性ラベルを容器に熱融着するときのラベルの巻き込み、折れ、曲がり、樹脂被りなど不良の発生が極めて少なく、容器の外観性やバリヤ性が損なわれず、また、耐熱及び耐圧性が良好である。
【0014】
また、本発明のハイバリヤ性プラスチックカップ状容器は、ハイバリヤ性ラベルのバリヤ層として、酸化ケイ素蒸着フィルムやアルミナ蒸着フィルムを使用しているため、電子レンジでの使用が可能である。
【図面の簡単な説明】
【図1】(a)は、本発明の一実施形態のハイバリヤ性プラスチックカップ状容器の製造方法の第一段階で作製した容器の断面図であり、(b)は、第二段階で作製した容器の断面図である。
【図2】他の一実施形態のハイバリヤ性プラスチックカップ状容器の断面図である。
【図3】一実施形態のハイバリヤ性ラベルの構成を示す説明図である。
【符号の説明】
100a,100b……プラスチックカップ容器
110……フランジ
120……周壁
130……底壁
140……ハイバリヤ性ラベル
140a……周壁用ハイバリヤ性ラベル
140b……底壁用ハイバリヤ性ラベル
141,145……ポリプロピレンフィルム層
142……印刷層
143……蒸着層
144……ポリエチレンテレフタレートフィルム層
146……貫通孔
G……ゲート位置
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for producing a high-barrier plastic cup-shaped container used for beverages, foods, and the like.
[0002]
[Prior art]
Conventionally, for plastic cup-shaped containers used for contents whose color, flavor, fragrance, etc. are easily changed by oxygen, the containers are injection-molded by insert injection molding, and at the same time, a high barrier label is attached to the outer periphery of the container and the lower surface of the bottom wall. Was used in a high-barrier plastic cup-shaped container.
[0003]
[Problems to be solved by the invention]
However, in the above-mentioned conventional high-barrier plastic cup-shaped container, as the container becomes larger, according to the empirical knowledge of the inventors, for example, when the bore is 71 mm and the total height is 105 mm or more, the insert of the container is At the time of injection molding, the high barrier label is likely to be entangled, bent, bent, covered with resin, and the like, and as a result, the appearance and barrier properties are impaired, and the production yield and commercial value are significantly reduced. Further, when the contents are subjected to high-temperature and high-pressure sterilization, heat resistance and pressure resistance may be significantly reduced. In recent years, the suitability for a microwave oven has also been required.
[0004]
The present invention solves the above-mentioned problems in the conventional method for manufacturing a high-barrier plastic cup-shaped container, and does not impair the appearance and barrier properties even in a large size, has heat resistance and pressure resistance, and is used in a microwave oven. A method for producing a possible high barrier plastic cup-shaped container is provided.
[0005]
[Means for Solving the Problems]
That is, the first invention of the present invention has an inverted cut right conical shape having a flange for heat-sealing a sealing film on the outer periphery of the upper end, and a high-barrier label being heat-sealed on the outer peripheral surface of the peripheral wall and the lower surface of the bottom wall. In the method for producing a plastic cup-shaped container of the present invention, in the first step, the high barrier label for the peripheral wall is temporarily bonded to the surface of the peripheral wall cavity in the injection molding die in advance, and the container is injection-molded at the same time. The high barrier label for the peripheral wall is thermally fused to the surface of the container, and in a second step, the high barrier label for the bottom wall is thermally fused to the lower surface of the bottom wall of the container to which the high barrier label for the peripheral wall is thermally fused to the outer peripheral surface of the peripheral wall. A method for producing a high-barrier plastic cup-shaped container, characterized by being thermally fused by a bonding method.
[0006]
The second invention of the present invention is the method for producing a high-barrier plastic cup-shaped container according to claim 1, wherein the barrier layer of the label is a vapor-deposited film layer.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of a method for producing a high-barrier plastic cup-shaped container of the present invention will be described in detail with reference to the drawings.
FIG. 1A is a cross-sectional view of a container manufactured in a first step of the method for manufacturing a high-barrier plastic cup-shaped container according to one embodiment of the present invention, and FIG. 1B is manufactured in a second step. It is sectional drawing of a container. FIG. 2 is a cross-sectional view of a high-barrier plastic cup-shaped container according to another embodiment, and FIG. 3 is an explanatory diagram showing a configuration of one embodiment of a high-barrier label.
[0008]
The high-barrier plastic cup-shaped container manufactured by the manufacturing method of the present invention, after filling the contents around the opening at the upper end, sealing the container by heat-sealing a sealing film by a heat sealing method or the like. This is an inverted-cut, right-conical plastic cup-shaped container that has a flange for carrying out, and a high-barrier label is heat-sealed to the outer peripheral surface of the peripheral wall and the lower surface of the bottom wall. The container size is almost 71 mm, Is intended for large containers of 105 mm or more. The material of the container is usually a thermoplastic resin such as polypropylene having appropriate rigidity.
[0009]
In the manufacturing method of the present invention, the manufacturing process is divided into two steps. The first step is to insert the high barrier label for the peripheral wall into the injection molding die of the container in advance by the insert injection molding method. 1A, the molten resin is injected into the cavity from the gate, and the container is injection molded. At the same time, as shown in FIG. 1A, a high barrier label for the peripheral wall (120) is formed on the outer peripheral surface of the peripheral wall (120) of the container. 140a) is heat-sealed to produce an intermediate-stage plastic cup-shaped container (100a). The second step is a heat sealing method such as an ultrasonic seal or a high-frequency seal, and the lower surface of the bottom wall (130) of the container for heat-sealing the high barrier label for the peripheral wall to the outer peripheral surface of the peripheral wall produced in the first step is As shown in FIG. 1 (b), the high barrier label (140b) for the bottom wall is heat-sealed by a heat fusion method to produce a final high barrier plastic cup-shaped container (100b).
[0010]
The gate position is normally at the center of the upper surface of the bottom wall as shown in FIG. 1A, but may be at the center of the lower surface of the bottom wall as needed. In this case, a gate mark remains at the center of the lower surface of the bottom wall of the container. To avoid this gate mark, a high barrier label having a through hole at the center position is attached to the lower surface of the bottom wall as shown in FIG. It is good to perform heat fusion.
[0011]
The configuration of the high barrier label has a vapor deposited film layer as a barrier layer in the constituent layers, and has a resin film layer (sealant layer) which is thermally fused to the material of the container on the container side layer. When the material of the container is polypropylene, for example, as shown in FIG. 3, <outer surface> polypropylene print film layer (141) (print base film) / print layer (142) / vapor deposition layer (143) / polyethylene terephthalate film A high barrier label having a layer (144) (vapor-deposited base film) / polypropylene film layer (145) (sealant layer) configuration is used. Note that the deposition layer is a silicon oxide deposition layer, an alumina deposition layer, or the like. The printing layer is provided as needed.
[0012]
In the method for manufacturing a high-barrier plastic cup-shaped container of the present invention described above, in the first step, a cup-shaped container for heat-sealing a high-barrier label on the outer peripheral surface of the peripheral wall is produced by an insert injection molding method. Since the high-barrier label is thermally fused to the lower surface of the bottom wall of the cup-shaped container manufactured in the first step by a heat fusion method, the conventional high-barrier label is attached to the outer peripheral surface of the peripheral wall and the lower surface of the bottom wall. At the same time, unlike heat sealing by insert injection molding, even if a large container is manufactured, the occurrence of entanglement, folding, bending, resin covering, etc. of the high barrier label during insert injection molding is extremely reduced, It has good appearance and barrier properties, has heat resistance and pressure resistance, and uses a vapor-deposited film instead of metal foil for the barrier layer of the high barrier label. The ability.
[0013]
【The invention's effect】
In the method for manufacturing a high-barrier plastic cup-shaped container according to the present invention, in a first step, a high-barrier label is heat-sealed to the outer peripheral surface of the peripheral wall by insert injection molding, and in a second step, a high barrier is attached to the lower surface of the bottom wall. This is a method for heat-sealing high-performance labels by heat-sealing.Even if a relatively large plastic cup-shaped container is manufactured, the label is entangled, bent, or bent when the high-barrier label is heat-sealed to the container. In addition, the occurrence of defects such as resin covering is extremely small, the appearance and barrier properties of the container are not impaired, and the heat resistance and pressure resistance are good.
[0014]
Further, the high-barrier plastic cup-shaped container of the present invention uses a silicon oxide-deposited film or an alumina-deposited film as a barrier layer of the high-barrier label, so that it can be used in a microwave oven.
[Brief description of the drawings]
FIG. 1A is a cross-sectional view of a container manufactured in a first step of a method for manufacturing a high-barrier plastic cup-shaped container according to an embodiment of the present invention, and FIG. It is sectional drawing of a container.
FIG. 2 is a cross-sectional view of a high-barrier plastic cup-shaped container according to another embodiment.
FIG. 3 is an explanatory diagram showing a configuration of a high barrier label of one embodiment.
[Explanation of symbols]
100a, 100b ... plastic cup container 110 ... flange 120 ... peripheral wall 130 ... bottom wall 140 ... high barrier label 140a ... peripheral wall high barrier label 140b ... bottom wall high barrier label 141, 145 ... polypropylene Film layer 142 Print layer 143 Deposition layer 144 Polyethylene terephthalate film layer 146 Through hole G Gate position

Claims (2)

上端外周に封止フィルムを熱融着するためのフランジを有し、周壁外周面と底壁下面にハイバリヤ性ラベルを熱融着した倒立切断直円錐状のプラスチックカップ状容器の製造方法において、第一段階で、前もって射出成形用金型内に周壁用ハイバリヤ性ラベルを周壁キャビティー面に仮接着し、容器を射出成形すると同時に、前記容器の周壁外周面に前記周壁用ハイバリヤ性ラベルを熱融着し、第二段階で、前記周壁外周面に周壁用ハイバリヤ性ラベルを熱融着する容器の底壁下面に、底壁用ハイバリヤ性ラベルを熱融着法により熱融着したことを特徴とするハイバリヤ性プラスチックカップ状容器の製造方法。A method for manufacturing an inverted cut right-cone plastic cup-shaped container having a flange for heat-sealing a sealing film on an upper end outer periphery and heat-sealing a high barrier label on a peripheral wall outer peripheral surface and a bottom wall lower surface. In one step, the peripheral barrier label is temporarily bonded to the peripheral cavity surface in the injection mold in advance, and the container is injection molded. In the second step, the high barrier label for the bottom wall is heat-fused to the lower surface of the bottom wall of the container to which the high barrier label for the peripheral wall is heat-fused to the outer peripheral surface of the peripheral wall by a heat fusion method. For producing a high barrier plastic cup-shaped container. 前記ラベルのバリヤ層が、蒸着フィルム層であることを特徴とする請求項1記載のハイバリヤ性プラスチックカップ状容器の製造方法。The method according to claim 1, wherein the barrier layer of the label is a vapor-deposited film layer.
JP2003147325A 2003-05-26 2003-05-26 Method for manufacturing high barrier plastic cup-like container Pending JP2004345300A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008062396A1 (en) * 2006-11-26 2008-05-29 Keter Plastic Ltd. Injection molding method and system, and molded products manufactured thereby
EP2011739A1 (en) * 2007-07-02 2009-01-07 Superfos A/S Injection moulded packaging article with a barrier layer
TWI424916B (en) * 2009-08-14 2014-02-01 Chung Shan Inst Of Science Fabrication of thick walled high density polyethylene container
CN103817943A (en) * 2013-11-19 2014-05-28 浙江祥邦科技有限公司 Microwave treatment method for shrinkage rate of thin films or packaging adhesive films

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008062396A1 (en) * 2006-11-26 2008-05-29 Keter Plastic Ltd. Injection molding method and system, and molded products manufactured thereby
US8246895B2 (en) 2006-11-26 2012-08-21 Keter Plastic Ltd. Injection molding method
EP2011739A1 (en) * 2007-07-02 2009-01-07 Superfos A/S Injection moulded packaging article with a barrier layer
TWI424916B (en) * 2009-08-14 2014-02-01 Chung Shan Inst Of Science Fabrication of thick walled high density polyethylene container
CN103817943A (en) * 2013-11-19 2014-05-28 浙江祥邦科技有限公司 Microwave treatment method for shrinkage rate of thin films or packaging adhesive films

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