JP2019171604A - Coating laminate, composite molded container and manufacturing method of the composite molded container - Google Patents
Coating laminate, composite molded container and manufacturing method of the composite molded container Download PDFInfo
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Abstract
Description
本発明は、複合成形容器および複合成形容器の製造方法に関する。 The present invention relates to a composite molded container and a method for producing a composite molded container.
従来から、ガスバリア性を付与したカップ状の容器として、例えば特許文献１に記載されているように、ガスバリア性樹脂層と熱可塑性樹脂層とを有する透明多層シートを熱可塑性樹脂層が外面側になるようにシート成形法によって容器形状に成形してなる容器内面部構成体と、該容器内面部構成体の外面側に熱可塑性樹脂層と接着性を有する熱可塑性樹脂を射出成形して容器内面部構成体と一体に形成した容器外面部構成体とからなる透明容器が知られている。 Conventionally, as a cup-shaped container having a gas barrier property, for example, as described in Patent Document 1, a transparent multilayer sheet having a gas barrier resin layer and a thermoplastic resin layer is formed on the outer surface side of the thermoplastic resin layer. A container inner surface portion formed by forming into a container shape by a sheet molding method, and a container inner surface by injection molding a thermoplastic resin layer and an adhesive resin on the outer surface side of the container inner surface portion structure 2. Description of the Related Art A transparent container including a container outer surface part structure formed integrally with a part structure is known.
上記の特許文献１の例では、ガスバリア性樹脂層が容器の内面側、すなわち内容物側に位置する。この場合、容器内面部構成体と容器外面部構成体との接着性には問題がないものの、レトルト殺菌などで内容物が加熱された場合に、容器内面部構成体の表面に凹凸が生じて外観不良になる場合があった。これは、内容物の加熱時に容器内が高温高湿の雰囲気になることによって、例えばエチレン−ビニルアルコール共重合体（ＥＶＯＨ）のような吸湿性のあるガスバリア性樹脂層が吸湿および膨潤するためである。 In the example of said patent document 1, a gas barrier resin layer is located in the inner surface side of a container, ie, the content side. In this case, there is no problem in the adhesion between the container inner surface component and the container outer surface component, but when the contents are heated by retort sterilization, the surface of the container inner surface component is uneven. In some cases, the appearance was poor. This is because a gas barrier resin layer having a hygroscopic property, such as an ethylene-vinyl alcohol copolymer (EVOH), absorbs and swells when the contents are heated to a high temperature and high humidity atmosphere. is there.
そこで、本発明は、射出成形容器とその内容物側を被覆する被覆積層体とを含む複合成形容器において、内容物の加熱時の高温高湿の容器内雰囲気が被覆積層体のバリア層に与える影響を低減することが可能な複合成形容器、および複合成形容器の製造方法を提供することを目的とする。 Accordingly, the present invention provides a composite molded container including an injection molded container and a coated laminate that covers the contents side thereof, and a high-temperature and high-humidity atmosphere in the container when the contents are heated gives the barrier layer of the coated laminate. It is an object of the present invention to provide a composite molded container capable of reducing the influence and a method for producing the composite molded container.
本発明のある観点によれば、射出成形容器と、射出成形容器の内容物側を被覆する被覆積層体とを含む複合成形容器において、被覆積層体が、少なくとも１層のバリア層と、バリア層に対して内容物側に形成される第１の基材層と、バリア層に対して射出成形容器側に形成される第２の基材層とを含み、第１の基材層が第２の基材層よりも厚く形成される。
本発明の別の観点によれば、上記の複合成形容器の製造方法であって、被覆積層体を金型内に装着する工程と、金型内に射出成形容器を形成する樹脂材料を射出する工程とを含む複合成形容器の製造方法が提供される。
本発明のさらに別の観点によれば、上記の複合成形容器の製造方法であって、被覆積層体を、射出成形容器の内容物側に沿う形状に成形する工程と、成形された被覆積層体を金型内に配置する工程と、金型内に射出成形容器を形成する樹脂材料を射出する工程とを含む複合成形容器の製造方法が提供される。
上記の構成では、第２の基材層によって射出成形容器と被覆積層体の樹脂とを溶着するための必要最低限の厚みを確保する一方で、第１の基材層によってバリア層を内容物から十分に離隔させることができる。従って、上記の構成では、内容物の加熱時の高温高湿の容器内雰囲気がバリア層に与える影響が低減され、バリア層に含まれるＥＶＯＨなどの吸湿性があるガスバリア性樹脂が吸湿及び膨潤することによって生じる外観不良を防止することができる。
According to an aspect of the present invention, in a composite molded container including an injection molded container and a coated laminate that covers the contents side of the injection molded container, the coated laminate includes at least one barrier layer, and a barrier layer A first base material layer formed on the content side and a second base material layer formed on the injection molding container side with respect to the barrier layer, the first base material layer being the second It is formed thicker than the base material layer.
According to another aspect of the present invention, there is provided a method for producing the above composite molded container, the step of mounting the coated laminate in a mold, and the injection of a resin material that forms the injection molded container in the mold. And a process for producing a composite molded container.
According to still another aspect of the present invention, there is provided a method for manufacturing the above composite molded container, the step of molding the coated laminate into a shape along the content side of the injection molded container, and the molded coated laminate There is provided a method for manufacturing a composite molded container, which includes a step of placing a mold in a mold and a step of injecting a resin material for forming an injection molded container in the mold.
In the above configuration, the second base material layer secures the minimum necessary thickness for welding the injection molded container and the resin of the covering laminate, while the first base material layer contains the barrier layer. Can be separated sufficiently from Therefore, in the above configuration, the influence of the high-temperature and high-humidity atmosphere in the container when the contents are heated on the barrier layer is reduced, and the hygroscopic gas barrier resin such as EVOH contained in the barrier layer absorbs and swells. Appearance defects caused by this can be prevented.
本発明では、射出成形容器とその内容物側を被覆する被覆積層体とを含む複合成形容器において、内容物の加熱時の高温高湿の容器内雰囲気が被覆積層体のバリア層に与える影響を低減することができる。 In the present invention, in a composite molded container including an injection-molded container and a coated laminate covering the contents side, the influence of the high-temperature and high-humidity atmosphere in the container upon heating of the contents on the barrier layer of the coated laminate Can be reduced.
以下に添付図面を参照しながら、本発明の好適な実施形態について詳細に説明する。なお、本明細書および図面において、実質的に同一の機能構成を有する構成要素については、同一の符号を付することにより重複説明を省略する。 Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the present specification and drawings, components having substantially the same functional configuration are denoted by the same reference numerals, and redundant description is omitted.
（第１の実施形態）
図１は、本発明の第１の実施形態に係る複合成形容器の断面図である。図１に示されるように、複合成形容器１０は、射出成形容器１１と、被覆積層体１２と、加飾ラベル１３とを含む。複合成形容器１０には、例えばヒートシールなどによって蓋体１４が接合される。以下、各部の構成についてさらに説明する。
(First embodiment)
FIG. 1 is a cross-sectional view of a composite molded container according to the first embodiment of the present invention. As shown in FIG. 1, the composite molded container 10 includes an injection molded container 11, a coating laminate 12, and a decorative label 13. A lid 14 is joined to the composite molded container 10 by, for example, heat sealing. Hereinafter, the configuration of each unit will be further described.
射出成形容器１１は、例えばポリオレフィン系樹脂で形成され、複合成形容器１０に必要な機械的強度、耐熱性、および耐衝撃性などを発揮する。ポリオレフィン系樹脂としては、ホモポロプロピレン（ＨＰＰ）、ランダムポリプロピレン（ＲＰＰ）もしくはブロックポリプロピレンなどのポリプロピレン系樹脂、高密度ポリエチレン（ＨＤＰＥ）もしくは低密度ポリエチレン（ＬＤＰＥ）などのポリエチレン系樹脂、ポリブチレン系樹脂、ポリスチレン系樹脂、または直鎖状エチレン−α−オレフィン共重合体などが用いられる。射出成形容器１１は、後述するように金型内に上記のような樹脂材料を射出する、いわゆるインモールド射出成形によって形成される。図示された例において、射出成形容器１１は、底面部１１１、側面部１１２およびフランジ部１１３を含む形状に成形されているが、この例には限られず容器として利用可能な各種の形状に成形されうる。 The injection-molded container 11 is formed of, for example, a polyolefin-based resin, and exhibits mechanical strength, heat resistance, impact resistance, and the like necessary for the composite molded container 10. Examples of polyolefin resins include polypropylene resins such as homopolypropylene (HPP), random polypropylene (RPP) or block polypropylene, polyethylene resins such as high density polyethylene (HDPE) or low density polyethylene (LDPE), polybutylene resins, A polystyrene resin, a linear ethylene-α-olefin copolymer, or the like is used. The injection-molded container 11 is formed by so-called in-mold injection molding in which the resin material as described above is injected into a mold as will be described later. In the illustrated example, the injection-molded container 11 is molded into a shape including a bottom surface portion 111, a side surface portion 112, and a flange portion 113, but is not limited to this example and is molded into various shapes that can be used as a container. sell.
被覆積層体１２は、例えばエチレン−ビニルアルコール共重合体（ＥＶＯＨ）で形成されるバリア層と、例えばポリオレフィン系樹脂で形成される少なくとも２層の基材層とを含む積層体であり、射出成形容器１１の内容物側を被覆する。本実施形態において、被覆積層体１２は射出成形容器１１の底面部１１１、側面部１１２およびフランジ部１１３を含むほぼ全体を被覆し、フランジ部１１３において蓋体１４に接合される。被覆積層体１２は、後述するように金型内に予め装着または配置され、そこに射出成形容器１１の樹脂材料が射出されることによって射出成形容器１１の内容物側に接着される。後述するように、被覆積層体１２においてバリア層の両側にある基材層の厚さを調節することによって、本実施形態では内容物の加熱時の高温高湿の容器内雰囲気が被覆積層体１２のバリア層に与える影響を低減している。 The covering laminate 12 is a laminate including a barrier layer formed of, for example, an ethylene-vinyl alcohol copolymer (EVOH) and at least two base layers formed of, for example, a polyolefin-based resin, and is injection molded. The contents side of the container 11 is covered. In the present embodiment, the covering laminate 12 covers substantially the entire surface including the bottom surface portion 111, the side surface portion 112, and the flange portion 113 of the injection molded container 11, and is joined to the lid body 14 at the flange portion 113. As will be described later, the coating laminate 12 is mounted or placed in advance in a mold, and the resin material of the injection molding container 11 is injected into the coating laminate 12 to be adhered to the content side of the injection molding container 11. As will be described later, by adjusting the thickness of the base material layer on both sides of the barrier layer in the coating laminate 12, in this embodiment, the high-temperature and high-humidity atmosphere in the container at the time of heating the contents is the coating laminate 12. The effect on the barrier layer is reduced.
加飾ラベル１３は、例えばポリプロピレン系樹脂で形成される印刷基材層や表面保護層などを含み、射出成形容器１１の内容物側とは反対側を少なくとも部分的に被覆する。本実施形態では被覆積層体１２によってガスバリア性が提供されるため、加飾ラベル１３は必ずしもバリア性を有さなくてもよく、従って射出成形容器１１を部分的に覆っていてもよい。例えば、加飾ラベル１３は、射出成形容器１１の底面部１１１および側面部１１２の平坦面だけを覆っていてもよい。加飾ラベル１３は、後述するように金型内で被覆積層体１２とは反対側に予め装着または配置され、そこに射出成形容器１１の樹脂材料が射出されることによって射出成形容器１１に接着される。なお、本実施形態において加飾ラベル１３は複合成形容器１０の意匠性を高めることを目的としており、ガスバリア性などの機能を提供するものではないため、省略することも可能である。 The decorative label 13 includes, for example, a printing base layer formed of a polypropylene-based resin, a surface protective layer, and the like, and at least partially covers the side opposite to the content side of the injection molded container 11. In this embodiment, since the gas barrier property is provided by the covering laminate 12, the decorative label 13 does not necessarily have the barrier property, and thus may partially cover the injection molded container 11. For example, the decorative label 13 may cover only the flat surfaces of the bottom surface portion 111 and the side surface portion 112 of the injection molded container 11. As will be described later, the decorative label 13 is mounted or disposed in advance on the opposite side of the coating laminate 12 in the mold, and the resin material of the injection molded container 11 is injected into the decorative label 13 so as to adhere to the injection molded container 11. Is done. In the present embodiment, the decorative label 13 is intended to enhance the design of the composite molded container 10 and does not provide functions such as gas barrier properties, and thus can be omitted.
蓋体１４は、例えばＥＶＯＨで形成されるバリア層と、例えばポリオレフィン系樹脂で形成される基材層とを含むシート状、またはフィルム状の積層体であり、射出成形容器１１のフランジ部１１３で、射出成形容器１１の内容物側を被覆する被覆積層体１２に接合される。蓋体１４と被覆積層体１２との間は、例えばヒートシール、超音波シール、または接着剤を用いた接合など公知の各種の手法で接合される。いずれもバリア層を含む被覆積層体１２および蓋体１４が互いに接合されて内容物が収納される収納空間Ｓを密封することによって、内容物に対するガスバリア性を提供することができる。なお、他の例では、射出成形容器１１および被覆積層体１２と同様に構成された成形容器（射出成形容器でなくてもよい）および被覆積層体が蓋体１４の代わりに配置されてもよい。 The lid 14 is a sheet-like or film-like laminate including a barrier layer formed of, for example, EVOH and a base material layer formed of, for example, a polyolefin-based resin. Then, it is joined to the covering laminate 12 that covers the contents side of the injection molded container 11. The lid 14 and the cover laminate 12 are bonded by various known methods such as heat sealing, ultrasonic sealing, or bonding using an adhesive. In either case, the covering laminate 12 including the barrier layer and the lid body 14 are joined to each other to seal the storage space S in which the contents are stored, thereby providing gas barrier properties to the contents. In another example, a molded container (not necessarily an injection molded container) configured similarly to the injection molded container 11 and the covering laminated body 12 and the covering laminated body may be arranged instead of the lid body 14. .
図２は、図１に示される複合成形容器に含まれる被覆積層体の積層構造を示す模式的な断面図である。図２に示されるように、被覆積層体１２は、バリア層１２１と、バリア層１２１に対して内容物側（図中の上側）に形成される内容物側基材層１２２（第１の基材層）と、バリア層１２１に対して射出成形容器側（図中の下側）に形成される容器側基材層１２３（第２の基材層）とを含む。バリア層１２１は、例えばＥＶＯＨ、またはポリキシリレンジアミンジパミドなどのガスバリア性に優れる材料で形成される。図示された例では１層のバリア層１２１が形成されているが、２層以上のバリア層が形成されてもよい。バリア層１２１の両側には、接着層１２１Ａ，１２１Ｂが形成される。 FIG. 2 is a schematic cross-sectional view showing a laminated structure of a coated laminated body included in the composite molded container shown in FIG. As shown in FIG. 2, the covering laminate 12 includes a barrier layer 121 and a content-side base material layer 122 (first base) formed on the content side (upper side in the drawing) with respect to the barrier layer 121. Material layer) and a container-side base material layer 123 (second base material layer) formed on the injection-molded container side (lower side in the figure) with respect to the barrier layer 121. The barrier layer 121 is formed of a material having excellent gas barrier properties such as EVOH or polyxylylenediamine dipamide. In the illustrated example, one barrier layer 121 is formed, but two or more barrier layers may be formed. Adhesive layers 121 </ b> A and 121 </ b> B are formed on both sides of the barrier layer 121.
内容物側基材層１２２は、第１の樹脂材料によって形成される樹脂層１２２Ａと、第２の樹脂材料によって形成される樹脂層１２２Ｂと、第３の樹脂材料によって形成される樹脂層１２２Ｃとを含む。容器側基材層１２３は、第１の樹脂材料によって形成される樹脂層１２３Ａと、第２の樹脂材料によって形成される樹脂層１２３Ｂとを含む。内容物側基材層１２２および容器側基材層１２３の各層を形成する第１の樹脂材料、第２の樹脂材料、および第３の樹脂材料は、ポリプロピレン系樹脂またはポリエチレン系樹脂などのポリオレフィン系樹脂である。例えば、第１の樹脂材料として再生材料を用いてもよい。 The content-side base material layer 122 includes a resin layer 122A formed of a first resin material, a resin layer 122B formed of a second resin material, and a resin layer 122C formed of a third resin material. including. The container side base material layer 123 includes a resin layer 123A formed of a first resin material and a resin layer 123B formed of a second resin material. The first resin material, the second resin material, and the third resin material that form each of the content-side base material layer 122 and the container-side base material layer 123 are polyolefin-based resins such as polypropylene-based resins or polyethylene-based resins. Resin. For example, a recycled material may be used as the first resin material.
本実施形態では、内容物側基材層１２２（第１の基材層）および容器側基材層１２３（第２の基材層）で同じ樹脂材料（第２の樹脂材料）によって形成される樹脂層１２２Ｂ，１２３Ｂについて、容器側基材層１２３に含まれる樹脂層１２３Ｂが内容物側基材層１２２に含まれる樹脂層１２２Ｂよりも薄く形成される。このような構成は、例えば、被覆積層体１２の各層を共押出によって形成するときに、内容物側基材層１２２側および容器側基材層１２３側にそれぞれ第２の樹脂材料を供給する経路のうち、容器側基材層１２３側の経路を絞り、容器側基材層１２３側に供給される第２の樹脂材料を内容物側基材層１２２側よりも少なくすることによって可能になる。 In this embodiment, the content side base material layer 122 (first base material layer) and the container side base material layer 123 (second base material layer) are formed of the same resin material (second resin material). About resin layer 122B, 123B, resin layer 123B contained in the container side base material layer 123 is formed thinner than resin layer 122B contained in the content side base material layer 122. FIG. In such a configuration, for example, when each layer of the coated laminate 12 is formed by coextrusion, a route for supplying the second resin material to the content side base material layer 122 side and the container side base material layer 123 side, respectively. Among them, the path on the container side base material layer 123 side is narrowed, and the second resin material supplied to the container side base material layer 123 side is made smaller than that on the content side base material layer 122 side.
他の例では、第１の樹脂材料によって形成される樹脂層１２２Ａ，１２３Ａについて、容器側基材層１２３に含まれる樹脂層１２３Ａを内容物側基材層１２２に含まれる樹脂層１２２Ａよりも薄く成形してもよい。このような構成は、例えば、被覆積層体１２の各層を共押出によって形成するときに、内容物側基材層１２２側および容器側基材層１２３側にそれぞれ第１の樹脂材料を供給する経路のうち、容器側基材層１２３側の経路を絞り、容器側基材層１２３側に供給される第１の樹脂材料を内容物側基材層１２２側よりも少なくすることによって可能になる。 In another example, for the resin layers 122A and 123A formed of the first resin material, the resin layer 123A included in the container-side base material layer 123 is thinner than the resin layer 122A included in the content-side base material layer 122. You may shape | mold. In such a configuration, for example, when each layer of the coated laminate 12 is formed by coextrusion, a route for supplying the first resin material to the contents side base material layer 122 side and the container side base material layer 123 side, respectively. Among them, the path on the container-side base material layer 123 side is narrowed, and the first resin material supplied to the container-side base material layer 123 side is made smaller than the content-side base material layer 122 side.
本実施形態では、内容物側基材層１２２（第１の基材層）が容器側基材層１２３（第２の基材層）よりも厚く形成される結果、バリア層１２１から内容物までの距離ｄ１が、バリア層１２１から射出成形容器１１までの距離ｄ２に比べて大きくなる。それゆえ、距離ｄ２によって射出成形容器１１と被覆積層体１２の樹脂とを溶着するための必要最低限の厚みを確保する一方で、距離ｄ１を大きくしてバリア層１２１を内容物から離隔させることが可能であり、従って内容物の加熱時の高温高湿の容器内雰囲気によってバリア層１２１に含まれるＥＶＯＨなどの吸湿性があるガスバリア性樹脂が吸湿および膨潤して被覆積層体１２の表面に凹凸が生じるのを防止することができる。 In this embodiment, as a result of the content-side base material layer 122 (first base material layer) being formed thicker than the container-side base material layer 123 (second base material layer), from the barrier layer 121 to the content The distance d 1 is larger than the distance d 2 from the barrier layer 121 to the injection molded container 11. Spaced Therefore, the distance d 2 while ensuring the minimum necessary thickness for welding a resin injection molded container 11 with the coating stack 12, the barrier layer 121 from the contents of the distance d 1 is increased to Accordingly, the gas barrier resin having a hygroscopic property such as EVOH contained in the barrier layer 121 absorbs and swells due to the atmosphere in the high-temperature and high-humidity container when the contents are heated, so that the surface of the coated laminate 12 As a result, it is possible to prevent unevenness from occurring.
（複合成形容器の製造方法）
図３は、本発明の第１の実施形態に係る複合成形容器の製造方法について説明するための図である。図示されているように、複合成形容器１０は、シート状、またはフィルム状の被覆積層体１２を金型１５内に装着し、その上で金型１５内に射出成形容器１１を形成する樹脂材料１６を射出することによって製造される。あるいは、被覆積層体１２を真空成形、圧空成形、またはプレス成形などによって射出成形容器１１の内容物側に沿う形状に成形する工程が先に実行され、成形された被覆積層体１２を金型１５内に配置した上で、金型１５内に射出成形容器１１を形成する樹脂材料１６を射出してもよい。なお、図示されているように、複合成形容器１０が加飾ラベル１３を含む場合、加飾ラベル１３も樹脂材料１６を射出する前に金型１５内に装着または配置される。
(Production method of composite molded container)
Drawing 3 is a figure for explaining the manufacturing method of the composite fabrication container concerning a 1st embodiment of the present invention. As shown in the drawing, the composite molding container 10 is a resin material in which a sheet-like or film-like covering laminate 12 is mounted in a mold 15 and then an injection molding container 11 is formed in the mold 15. Manufactured by injecting 16. Alternatively, the step of forming the coated laminate 12 into a shape along the contents side of the injection-molded container 11 by vacuum forming, compressed air forming, press forming, or the like is executed first, and the formed coated laminate 12 is molded into the mold 15. The resin material 16 for forming the injection molding container 11 may be injected into the mold 15 after being disposed inside. As shown in the figure, when the composite molded container 10 includes a decorative label 13, the decorative label 13 is also mounted or placed in the mold 15 before the resin material 16 is injected.
（第２の実施形態）
次に、図４を参照して、本発明の第２の実施形態について説明する。本実施形態に係る複合成形容器は、被覆積層体２２の構成について第１の実施形態とは異なるものの、それ以外の構成および製造方法については第１の実施形態と同様であるため、以下では被覆積層体２２の構成について説明し、それ以外の重複した説明については省略する。
(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG. The composite molded container according to the present embodiment is different from the first embodiment in the configuration of the covering laminate 22, but the other configuration and manufacturing method are the same as those in the first embodiment. The configuration of the laminated body 22 will be described, and other redundant description will be omitted.
図４は、本発明の第２の実施形態に係る複合成形容器に含まれる被覆積層体の積層構造を示す模式的な断面図である。図４に示されるように、被覆積層体２２は、バリア層１２１と、バリア層１２１に対して内容物側（図中の上側）に形成される内容物側基材層２２２（第１の基材層）と、バリア層１２１に対して射出成形容器側（図中の下側）に形成される容器側基材層２２３（第２の基材層）とを含む。バリア層１２１は第１の実施形態と同様にガスバリア性に優れる材料で形成され、バリア層１２１の両側には接着層１２１Ａ，１２１Ｂが形成される。 FIG. 4 is a schematic cross-sectional view showing the laminated structure of the coated laminated body included in the composite molded container according to the second embodiment of the present invention. As shown in FIG. 4, the coating laminate 22 includes a barrier layer 121 and a content-side base material layer 222 (first substrate) formed on the content side (upper side in the drawing) with respect to the barrier layer 121. Material layer) and a container-side base material layer 223 (second base material layer) formed on the injection-molded container side (lower side in the figure) with respect to the barrier layer 121. The barrier layer 121 is formed of a material having excellent gas barrier properties as in the first embodiment, and adhesive layers 121A and 121B are formed on both sides of the barrier layer 121.
内容物側基材層２２２は、第１の樹脂材料によって形成される樹脂層２２２Ａと、第２の樹脂材料によって形成される樹脂層２２２Ｂとを含む。容器側基材層２２３は、第１の樹脂材料によって形成される樹脂層２２３Ａと、第３の樹脂材料によって形成される樹脂層２２３Ｃとを含む。内容物側基材層２２２および容器側基材層２２３の各層を形成する第１の樹脂材料、第２の樹脂材料、および第３の樹脂材料は、ポリプロピレン系樹脂またはポリエチレン系樹脂などのポリオレフィン系樹脂である。例えば、第１の樹脂材料として再生材料を用いてもよい。 The content-side base material layer 222 includes a resin layer 222A formed of the first resin material and a resin layer 222B formed of the second resin material. The container side base material layer 223 includes a resin layer 223A formed of a first resin material and a resin layer 223C formed of a third resin material. The first resin material, the second resin material, and the third resin material that form each of the content-side base material layer 222 and the container-side base material layer 223 are a polyolefin-based resin such as a polypropylene-based resin or a polyethylene-based resin. Resin. For example, a recycled material may be used as the first resin material.
本実施形態では、内容物側基材層２２２（第１の基材層）が第１の樹脂材料によって形成される樹脂層２２２Ａと、第２の樹脂材料によって形成される樹脂層２２２Ｂとを含むのに対して、容器側基材層２２３（第２の基材層）は第１の樹脂材料によって形成される樹脂層２２３Ａを含み、第２の樹脂材料によって形成される樹脂層を含まない。このような構成は、例えば、被覆積層体２２の各層を共押出によって形成するときに、内容物側基材層２２２側および容器側基材層２２３側にそれぞれ第２の樹脂材料を供給する経路のうち、容器側基材層２２３側の経路を遮断することによって、容器側基材層２２３側に第２の樹脂材料を供給しないことによって可能になる。 In the present embodiment, the content-side base material layer 222 (first base material layer) includes a resin layer 222A formed of the first resin material and a resin layer 222B formed of the second resin material. On the other hand, the container-side base material layer 223 (second base material layer) includes the resin layer 223A formed of the first resin material, and does not include the resin layer formed of the second resin material. In such a configuration, for example, when each layer of the coated laminate 22 is formed by coextrusion, a route for supplying the second resin material to the contents side base material layer 222 side and the container side base material layer 223 side, respectively. Among these, by blocking the path on the container-side base material layer 223 side, it is possible not to supply the second resin material to the container-side base material layer 223 side.
他の例では、内容物側基材層２２２が第１の樹脂材料によって形成される樹脂層２２２Ａと、第２の樹脂材料によって形成される樹脂層２２２Ｂとを含むのに対して、容器側基材層２２３が第１の樹脂材料によって形成される樹脂層を含まず、第２の樹脂材料によって形成される樹脂層を含んでもよい。このような構成は、例えば、被覆積層体２２の各層を共押出によって形成するときに、内容物側基材層２２２側および容器側基材層２２３側にそれぞれ第１の樹脂材料を供給する経路のうち、容器側基材層２２３側の経路を遮断することによって、容器側基材層２２３側に第１の樹脂材料を供給しないことによって可能になる。 In another example, the content side base material layer 222 includes a resin layer 222A formed of the first resin material and a resin layer 222B formed of the second resin material, whereas the container side base layer 222 includes The material layer 223 may include a resin layer formed of the second resin material without including the resin layer formed of the first resin material. In such a configuration, for example, when each layer of the coated laminate 22 is formed by coextrusion, a route for supplying the first resin material to the contents side base material layer 222 side and the container side base material layer 223 side, respectively. Among these, by blocking the path on the container-side base material layer 223 side, it is possible not to supply the first resin material to the container-side base material layer 223 side.
本実施形態でも、内容物側基材層２２２（第１の基材層）が容器側基材層２２３（第２の基材層）よりも厚く形成される結果、バリア層１２１から内容物までの距離ｄ１が、バリア層１２１から射出成形容器１１までの距離ｄ２に比べて大きくなる。それゆえ、第１の実施形態と同様に、距離ｄ２によって射出成形容器１１と被覆積層体２２の樹脂とを溶着するための必要最低限の厚みを確保する一方で、距離ｄ１を大きくしてバリア層１２１を内容物から離隔させることが可能であり、従って内容物の加熱時の高温高湿の容器内雰囲気によってバリア層１２１に含まれるＥＶＯＨなどの吸湿性があるガスバリア性樹脂が吸湿および膨潤して被覆積層体２２の表面に凹凸が生じるのを防止することができる。 Also in this embodiment, as a result of the content-side base material layer 222 (first base material layer) being formed thicker than the container-side base material layer 223 (second base material layer), from the barrier layer 121 to the content The distance d 1 is larger than the distance d 2 from the barrier layer 121 to the injection molded container 11. Therefore, as in the first embodiment, the distance d 2 while ensuring the minimum necessary thickness for welding the injection molding container 11 and the resin of the coating stack 22, to increase the distance d 1 Thus, the barrier layer 121 can be separated from the contents, and accordingly, the gas barrier resin having a hygroscopic property such as EVOH contained in the barrier layer 121 is absorbed by the atmosphere in the high-temperature and high-humidity container when the contents are heated. It is possible to prevent the surface of the covering laminate 22 from swelling and unevenness from occurring.
上記で説明した本発明の第１および第２の実施形態では、バリア層１２１に含まれるＥＶＯＨなどの吸湿性があるガスバリア性樹脂の吸湿および膨潤を防止する観点から、内容物側基材層１２２，２２２の厚みを２７０μｍ以上とすることが好ましい。この場合、バリア層１２１から内容物までの距離ｄ１は２７０μｍよりも大きくなる。また、上記で説明した本発明の第１および第２の実施形態では、射出成形容器１１と被覆積層体１２，２２の樹脂とを十分に溶着させる観点から、容器側基材層１２３，２２３の厚みを６０μｍ以上とすることが好ましい。これによって、この場合、バリア層１２１から射出成形容器１１までの距離ｄ２は６０μｍよりも大きくなる。 In the first and second embodiments of the present invention described above, the content-side base material layer 122 is used from the viewpoint of preventing moisture absorption and swelling of a gas barrier resin having a hygroscopic property such as EVOH contained in the barrier layer 121. , 222 is preferably 270 μm or more. In this case, the distance d 1 from the barrier layer 121 to the contents is greater than 270 μm. In the first and second embodiments of the present invention described above, the container-side base material layers 123 and 223 are formed from the viewpoint of sufficiently welding the injection-molded container 11 and the resin of the covering laminates 12 and 22. The thickness is preferably 60 μm or more. Thus, in this case, the distance d 2 from the barrier layer 121 to the injection molding container 11 is greater than 60 [mu] m.
（適用可能な構造）
図５は、本発明の実施形態において適用可能な構造の第１の例を示す断面図である。図５（Ａ）に示すように、複合成形容器３０は、射出成形容器１１、被覆積層体３２、および加飾ラベル１３を含む。被覆積層体３２は表面層３２１および表面下層３２２を含み、表面層３２１に切り込み３２３が形成される。フランジ部１１３に形成された接合領域１１３Ａにおける表面層３２１と蓋体１４との接合強度は、被覆積層体３２における表面層３２１と表面下層３２２との層間接合強度よりも強い。これによって、図５（Ｂ）に示すように、開封時には接合領域１１３Ａで表面層３２１と表面下層３２２との間が層間剥離する。層間剥離した表面層３２１は切り込み３２３で破断し、それによって蓋体１４が被覆積層体３２および射出成形容器１１から分離される。
(Applicable structure)
FIG. 5 is a cross-sectional view showing a first example of a structure applicable in the embodiment of the present invention. As shown in FIG. 5A, the composite molded container 30 includes an injection molded container 11, a covering laminate 32, and a decorative label 13. The covering laminate 32 includes a surface layer 321 and a surface lower layer 322, and a cut 323 is formed in the surface layer 321. The bonding strength between the surface layer 321 and the lid body 14 in the bonding region 113 </ b> A formed in the flange portion 113 is stronger than the interlayer bonding strength between the surface layer 321 and the surface lower layer 322 in the covering laminate 32. As a result, as shown in FIG. 5B, delamination occurs between the surface layer 321 and the surface lower layer 322 in the bonding region 113A at the time of opening. The delaminated surface layer 321 is broken at the notch 323, whereby the lid body 14 is separated from the coating laminate 32 and the injection molded container 11.
上記のような被覆積層体３２と蓋体１４との接合構造は、例えば特開昭６３−７８号公報などの文献に記載されている。切り込み３２３の代わりに、表面層３２１が薄く成形された部分、または表面層３２１が途切れた部分を形成してもよい。表面層３２１と表面下層３２２との層間接合強度を弱めることによって開封を容易にすることができる一方で、接合領域１１３Ａでの接合強度を強くすることによって耐内圧性を高めることができる。本発明の実施形態では、複合成形容器が射出成形容器と被覆積層体とを含んで構成されることによって、上記のような被覆積層体３２と蓋体１４との接合構造を採用することができる。例えば、第１の実施形態で上記の接合構造を採用した場合、被覆積層体１２の樹脂層１２２Ｃを表面層３２１とし、それ以外の層を表面下層３２２としてもよい。 The joint structure between the covering laminate 32 and the lid 14 as described above is described in documents such as Japanese Patent Application Laid-Open No. 63-78. Instead of the notches 323, a portion where the surface layer 321 is formed thin or a portion where the surface layer 321 is interrupted may be formed. Opening can be facilitated by weakening the interlayer bonding strength between the surface layer 321 and the surface lower layer 322, while the internal pressure resistance can be increased by increasing the bonding strength in the bonding region 113A. In the embodiment of the present invention, the composite molded container includes the injection molded container and the coated laminate, so that the above-described joining structure of the coated laminate 32 and the lid body 14 can be employed. . For example, when the above-described bonding structure is employed in the first embodiment, the resin layer 122C of the cover laminate 12 may be the surface layer 321 and the other layers may be the surface lower layer 322.
図６は、本発明の実施形態において適用可能な構造の第２の例を示す断面図である。図６（Ａ）に示すように、複合成形容器４０は、射出成形容器１１、被覆積層体４２、および加飾ラベル１３を含む。被覆積層体４２は表面層４２１および表面下層４２２を含み、表面層４２１および表面下層４２２を形成する樹脂によって樹脂溜まり部４２３が形成される。一方、蓋体４４は、シール層４４１および外層４４２を含み、シール層４４１を形成する樹脂によって樹脂溜まり部４４３が形成される。被覆積層体４２の表面層４２１の凝集強度は、フランジ部１１３に形成された接合領域１１３Ａにおける表面層４２１と表面下層４２２との接合強度よりも弱く、また被覆積層体４２および蓋体４４の各層の間の層間接合強度、および被覆積層体４２と射出成形容器１１との間の接合強度よりも弱い。これによって、図６（Ｂ）に示すように、開封時には接合領域１１３Ａで表面層４２１が凝集破壊される。表面層４２１の凝集破壊は樹脂溜まり部４２３で途切れ、それによって蓋体４４が被覆積層体４２および射出成形容器１１から分離される。 FIG. 6 is a cross-sectional view showing a second example of a structure applicable in the embodiment of the present invention. As shown in FIG. 6A, the composite molded container 40 includes an injection molded container 11, a covering laminate 42, and a decorative label 13. The covering laminate 42 includes a surface layer 421 and a surface lower layer 422, and the resin reservoir 423 is formed by a resin that forms the surface layer 421 and the surface lower layer 422. On the other hand, the lid body 44 includes a seal layer 441 and an outer layer 442, and a resin reservoir 443 is formed by a resin that forms the seal layer 441. The cohesive strength of the surface layer 421 of the covering laminate 42 is weaker than the joining strength of the surface layer 421 and the surface lower layer 422 in the joining region 113A formed in the flange 113, and each layer of the covering laminate 42 and the lid 44 is provided. It is weaker than the interlayer bonding strength between the two and the bonding strength between the coating laminate 42 and the injection molded container 11. As a result, as shown in FIG. 6B, the surface layer 421 is coherently broken in the bonding region 113A at the time of opening. The cohesive failure of the surface layer 421 is interrupted at the resin reservoir 423, whereby the lid body 44 is separated from the coating laminate 42 and the injection molded container 11.
上記のような被覆積層体４２と蓋体４４との接合構造は、例えば特許第５００１９６２号公報などの文献に記載されている。図７の第３の例に示すように、被覆積層体４２の表面層４２１ではなく蓋体４４のシール層４４１を凝集破壊させてもよい。表面層４２１またはシール層４４１の凝集強度を弱めることによって開封を容易にすることができる一方で、接合領域１１３Ａでの接合強度を強くすることによって耐内圧性を高めることができる。本発明の実施形態では、複合成形容器が射出成形容器と被覆積層体とを含んで構成されることによって、上記のような被覆積層体４２と蓋体４４との接合構造を採用することができる。例えば、第１の実施形態で上記の接合構造を採用した場合、被覆積層体１２の樹脂層１２２Ｃを表面層４２１とし、それ以外の層を表面下層４２２および基材層４２３としてもよい。 The joint structure between the covering laminate 42 and the lid 44 as described above is described in documents such as Japanese Patent No. 5001962. As shown in the third example of FIG. 7, the sealing layer 441 of the lid 44 may be coherently broken instead of the surface layer 421 of the covering laminate 42. Opening can be facilitated by weakening the cohesive strength of the surface layer 421 or the seal layer 441, while the internal pressure resistance can be enhanced by increasing the joint strength in the joint region 113A. In the embodiment of the present invention, the composite molded container includes the injection molded container and the coating laminate, so that the joint structure of the coating laminate 42 and the lid 44 as described above can be employed. . For example, when the above-described bonding structure is employed in the first embodiment, the resin layer 122C of the covering laminate 12 may be the surface layer 421, and the other layers may be the surface lower layer 422 and the base material layer 423.
以上、添付図面を参照しながら本発明の好適な実施形態について詳細に説明したが、本発明はかかる例に限定されない。本発明の属する技術の分野における通常の知識を有する者であれば、特許請求の範囲に記載された技術的思想の範囲内において、各種の変形例または修正例に想到し得ることは明らかであり、これらについても、当然に本発明の技術的範囲に属するものと了解される。 The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to such examples. It is obvious that a person having ordinary knowledge in the technical field to which the present invention pertains can come up with various variations and modifications within the scope of the technical idea described in the claims. Of course, it is understood that these also belong to the technical scope of the present invention.
１０，２０…複合成形容器、１１…射出成形容器、１２，２２…被覆積層体、１３…加飾ラベル、１４…蓋体、１５…金型、１６…樹脂材料、１２１…バリア層、１２２，２２２…内容物側基材層、１２３，２２３…容器側基材層。 DESCRIPTION OF SYMBOLS 10,20 ... Composite molding container, 11 ... Injection molding container, 12, 22 ... Covering laminated body, 13 ... Decorating label, 14 ... Lid body, 15 ... Mold, 16 ... Resin material, 121 ... Barrier layer, 122, 222: Contents-side base material layer, 123, 223 ... Container-side base material layer.
本発明は、被覆積層体、複合成形容器および複合成形容器の製造方法に関する。 The present invention relates to a coated laminate, a composite molded container, and a method for producing a composite molded container.
そこで、本発明は、射出成形容器とその内容物側を被覆する被覆積層体とを含む複合成形容器において、内容物の加熱時の高温高湿の容器内雰囲気が被覆積層体のバリア層に与える影響を低減することが可能な被覆積層体、複合成形容器、および複合成形容器の製造方法を提供することを目的とする。 Accordingly, the present invention provides a composite molded container including an injection molded container and a coated laminate that covers the contents side thereof, and a high-temperature and high-humidity atmosphere in the container when the contents are heated gives the barrier layer of the coated laminate. It is an object of the present invention to provide a coated laminate, a composite molded container, and a method for producing a composite molded container capable of reducing the influence.
本発明のある観点によれば、射出成形容器と、射出成形容器の内容物側を被覆する被覆積層体とを含む複合成形容器に用いられる被覆積層体は、少なくとも１層のバリア層と、バリア層に対して内容物側に形成される第１の基材層と、バリア層に対して射出成形容器側に形成される第２の基材層とを含み、第１の基材層が第２の基材層よりも厚く形成される。
本発明の別の観点によれば、射出成形容器と、射出成形容器の内容物側を被覆する上記の被覆積層体とを含む複合成形容器が提供される。
本発明の別の観点によれば、上記の複合成形容器の製造方法であって、被覆積層体を金型内に装着する工程と、金型内に射出成形容器を形成する樹脂材料を射出する工程とを含む複合成形容器の製造方法が提供される。
本発明のさらに別の観点によれば、上記の複合成形容器の製造方法であって、被覆積層体を、射出成形容器の内容物側に沿う形状に成形する工程と、成形された被覆積層体を金型内に配置する工程と、金型内に射出成形容器を形成する樹脂材料を射出する工程とを含む複合成形容器の製造方法が提供される。
上記の構成では、第２の基材層によって射出成形容器と被覆積層体の樹脂とを溶着するための必要最低限の厚みを確保する一方で、第１の基材層によってバリア層を内容物から十分に離隔させることができる。従って、上記の構成では、内容物の加熱時の高温高湿の容器内雰囲気がバリア層に与える影響が低減され、バリア層に含まれるＥＶＯＨなどの吸湿性があるガスバリア性樹脂が吸湿及び膨潤することによって生じる外観不良を防止することができる。
According to an aspect of the present invention, a coated laminate used for a composite molded container including an injection molded container and a coated laminate that covers the contents side of the injection molded container includes at least one barrier layer, A first base material layer formed on the content side with respect to the layer, and a second base material layer formed on the injection molding container side with respect to the barrier layer, wherein the first base material layer is It is formed thicker than the two base material layers.
According to another aspect of the present invention, there is provided a composite molded container including an injection molded container and the above-mentioned coated laminate that covers the contents side of the injection molded container.
According to another aspect of the present invention, there is provided a method for producing the above composite molded container, the step of mounting the coated laminate in a mold, and the injection of a resin material that forms the injection molded container in the mold. And a process for producing a composite molded container.
According to still another aspect of the present invention, there is provided a method for manufacturing the above composite molded container, the step of molding the coated laminate into a shape along the content side of the injection molded container, and the molded coated laminate There is provided a method for manufacturing a composite molded container, which includes a step of placing a mold in a mold and a step of injecting a resin material for forming an injection molded container in the mold.
In the above configuration, the second base material layer secures the minimum necessary thickness for welding the injection molded container and the resin of the covering laminate, while the first base material layer contains the barrier layer. Can be separated sufficiently from Therefore, in the above configuration, the influence of the high-temperature and high-humidity atmosphere in the container when the contents are heated on the barrier layer is reduced, and the hygroscopic gas barrier resin such as EVOH contained in the barrier layer absorbs and swells. Appearance defects caused by this can be prevented.
Claims (8)
前記被覆積層体が、
少なくとも１層のバリア層と、
前記バリア層に対して前記内容物側に形成される第１の基材層と、
前記バリア層に対して前記射出成形容器側に形成される第２の基材層と
を含み、
前記第１の基材層が前記第２の基材層よりも厚く形成される、複合成形容器。 In a composite molded container comprising an injection molded container and a coated laminate that covers the contents side of the injection molded container,
The coating laminate is
At least one barrier layer;
A first base material layer formed on the content side with respect to the barrier layer;
A second base material layer formed on the injection molding container side with respect to the barrier layer,
A composite molded container in which the first base material layer is formed thicker than the second base material layer.
前記第２の基材層に含まれる前記樹脂層は、前記第１の基材層に含まれる前記樹脂層よりも薄く形成される、請求項１に記載の複合成形容器。 The first base material layer and the second base material layer include a resin layer formed of the same resin material,
The composite molded container according to claim 1, wherein the resin layer included in the second base material layer is formed thinner than the resin layer included in the first base material layer.
前記第２の基材層は、前記第１の樹脂材料によって形成される樹脂層を含み、前記第２の樹脂材料によって形成される樹脂層を含まない、請求項１または請求項２に記載の複合成形容器。 The first base material layer includes a resin layer formed of a first resin material and a resin layer formed of a second resin material,
The said 2nd base material layer contains the resin layer formed with the said 1st resin material, and does not contain the resin layer formed with the said 2nd resin material. Composite molded container.
前記被覆積層体を金型内に装着する工程と、
前記金型内に前記射出成形容器を形成する樹脂材料を射出する工程と
を含む複合成形容器の製造方法。 A method for producing a composite molded container according to any one of claims 1 to 6,
Mounting the coated laminate in a mold;
And a step of injecting a resin material for forming the injection molded container into the mold.
前記被覆積層体を、前記射出成形容器の内容物側に沿う形状に成形する工程と、
前記成形された被覆積層体を金型内に配置する工程と、
前記金型内に前記射出成形容器を形成する樹脂材料を射出する工程と
を含む複合成形容器の製造方法。 A method for producing a composite molded container according to any one of claims 1 to 6,
Molding the coated laminate into a shape along the contents side of the injection molded container;
Placing the molded covering laminate in a mold;
And a step of injecting a resin material for forming the injection molded container into the mold.
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