JP2007015751A - Laminated material for liquid paper container - Google Patents

Laminated material for liquid paper container Download PDF

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JP2007015751A
JP2007015751A JP2005201286A JP2005201286A JP2007015751A JP 2007015751 A JP2007015751 A JP 2007015751A JP 2005201286 A JP2005201286 A JP 2005201286A JP 2005201286 A JP2005201286 A JP 2005201286A JP 2007015751 A JP2007015751 A JP 2007015751A
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layer
polyethylene
polyester
liquid
liquid paper
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JP4797472B2 (en
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Yukihiro Nakamura
行宏 中村
Minoru Kawasaki
実 川崎
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Toppan Inc
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Toppan Printing Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a laminated material for liquid paper container which shows a superior heat sealing adaptability on a filling machine and not deteriorates any taste, flavor or odor of the stored content. <P>SOLUTION: The laminated material for liquid paper container 100 comprises an outer layer 110, a laminated middle layer 120 having a main paper layer and an inner sealant layer 130. The outer layer is a polyethylene layer, the sealant layer has a laminated configuration consisting of a polyester layer 131 as a middle layer side layer, a polyethylene layer 132 as a liquid-contacting side layer and a blended layer 133 comprised of polyester and polyethylene arranged between the middle layer side layer and the liquid-contacting side layer. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、含有成分が容器の接液層であるシーラント層に吸着され易い内容物又は容器臭が内容物に移行しやすい内容物を収納する液体紙容器を製袋するための液体紙容器用積層材に関するものである。   The present invention is for a liquid paper container for making a liquid paper container that contains a content that is easily adsorbed by a sealant layer, which is a liquid contact layer of the container, or a content in which a container odor is easily transferred to the content. It relates to a laminated material.

従来、酒類、果汁飲料などの長期保存を必要とする常温流通タイプの液体食品の容器として、液体紙容器が広い用途範囲に亙って大量に使用されてきた。これらの液体紙容器ととしては、頂部が切り妻屋根形で胴部が四角柱状の容器や、レンガ状の容器などがある。これらの液体紙容器を製袋している液体紙容器用積層材は、適性な適正な剛性とバリア性を必要とするため、紙層を主体層として、プラスティックフィルム層、アルミニューム箔層、蒸着フィルム層などを積層する液体紙容器用積層材を使用していた。この液体紙容器用積層材は、容器の外側となる最外層と、紙層を主体層とする積層の中間層と、接液する最内層のシーラント（ヒートシール材）層とからなる。そして、シーラント層としては、例えば６０μｍ厚のポリエチレン層が、一般的に用いられていた。また、含有成分がシーラント層に吸着され易い内容物の場合には、例えば６０μｍ厚のポリエステル層が用いられていた。   Conventionally, liquid paper containers have been used in large quantities over a wide range of applications as containers for liquid foods of the normal temperature distribution type that require long-term storage such as alcoholic beverages and fruit juice drinks. As these liquid paper containers, there are a container having a gable roof shape at the top and a quadrangular prism shape at the trunk, and a brick-shaped container. Since the liquid paper container laminates that make these liquid paper containers require appropriate and appropriate rigidity and barrier properties, the paper layer is the main layer, plastic film layer, aluminum foil layer, vapor deposition The laminated material for liquid paper containers which laminates a film layer etc. was used. This laminated material for a liquid paper container is composed of an outermost layer that is the outside of the container, an intermediate layer that is a main layer of the paper layer, and an innermost sealant (heat seal material) layer that is in contact with the liquid. As the sealant layer, for example, a polyethylene layer having a thickness of 60 μm is generally used. Further, in the case of a content in which the contained component is easily adsorbed to the sealant layer, for example, a polyester layer having a thickness of 60 μm has been used.

しかしながら、上述した従来の液体紙容器用積層材は、シーラント層に６０μｍ厚のポリエチレン層を用いた場合には、ヒートシール性がよく、容器としての密封性が良好であるが、シーラント層の低分子量のポリエチレン成分が内容物に溶出して、ポリエチレン臭が内容物に移行したり、又、逆に、内容物に含有する有効成分を、例えば、ジュースの香気成分であるリモネン（Ｃ10Ｈ16）などをシーラント層が吸着して、内容物の味覚や香り変化してしまうことがあった。また、シーラント層に６０μｍ厚のポリエステル層を用いた場合には、内容物の味覚や香り変化は少ないが、例えば、充填機上でのヒートシール適性が劣り、容器としての密封性に漏れなどの問題を生じることがあった。これは、充填機の製袋工程において加熱と加圧とが別セクションになっており、結晶化スピードの早いポリエステル層が、加圧時に流動性が低下しており、ヒートシール性が低下するためである。また、３層共押出しで、中間層のポリエステル層に、接着樹脂層を設けてシーラント層のポリエチレン層を接着した場合には、接着樹脂層に起因する低分子量成分により、内容物の味覚や風味が損なわれることがあった。 However, the conventional laminate for liquid paper containers described above has good heat sealability and good sealing performance as a container when a polyethylene layer having a thickness of 60 μm is used as the sealant layer. The polyethylene component of molecular weight elutes in the contents, and the polyethylene odor shifts to the contents. Conversely, the active ingredient contained in the contents is, for example, limonene (C 10 H 16 which is an aroma component of juice). ) Or the like may be adsorbed by the sealant layer, which may change the taste or scent of the contents. In addition, when a 60 μm thick polyester layer is used for the sealant layer, the taste and fragrance change of the contents are small. For example, the heat sealability on the filling machine is inferior, and the sealing performance as a container leaks. There was a problem. This is because heating and pressurization are separate sections in the bag making process of the filling machine, and the polyester layer with a high crystallization speed has reduced fluidity during pressurization and heat sealability. It is. In addition, when the adhesive resin layer is provided on the polyester layer of the intermediate layer and the polyethylene layer of the sealant layer is adhered to the polyester layer of the intermediate layer by three-layer coextrusion, the taste and flavor of the contents are reduced by the low molecular weight component resulting from the adhesive resin layer. May be damaged.

本発明は、上述の従来の液体紙容器用積層材における問題点を解決したものであり、充填機上におけるヒートシール適性が良好であり、また、内容物の味覚、風味や香りなどを損なうことがない液体紙容器用積層材を提供するものである。   The present invention solves the problems in the above-mentioned conventional laminated materials for liquid paper containers, has good heat sealability on the filling machine, and impairs the taste, flavor, fragrance, etc. of the contents. The present invention provides a laminated material for a liquid paper container that does not have any.

すなわち、本発明の第１の発明は、外層と、紙層を主体とする積層の中間層と、内層のシーラント層とからなる液体紙容器用積層材において、外層がポリエチレン層で、シーラント層が積層構成で、中間層側層がポリエステル層で、接液側層がポリエチレン層で、中間層側層と接液側層との間にポリエステルとポリエチレンとのブレンド層を設けたことを特徴とする液体紙容器用積層材である。   That is, the first invention of the present invention is a laminate for a liquid paper container comprising an outer layer, a laminated intermediate layer mainly comprising a paper layer, and an inner sealant layer, wherein the outer layer is a polyethylene layer and the sealant layer is In the laminated structure, the intermediate layer side layer is a polyester layer, the liquid contact side layer is a polyethylene layer, and a blend layer of polyester and polyethylene is provided between the intermediate layer side layer and the liquid contact side layer. It is a laminated material for liquid paper containers.

次に、本発明の第２の発明は、ポリエステルとポリエチレンとのシーラント層のブレンド層が単層であることを特徴とする第１の発明に記載の液体紙容器用積層材である。   Next, a second invention of the present invention is the laminated material for a liquid paper container according to the first invention, wherein the blend layer of the sealant layer of polyester and polyethylene is a single layer.

次に、本発明の第３の発明は、シーラント層のポリエステルとポリエチレンとのブレンド層が２層以上の積層構成で、中間層側層に近い層ほどポリエチレンに対するポリエステルのブレンド比率を多くしたことを特徴とする第１の発明に記載の液体紙容器用積層材である。   Next, the third invention of the present invention is that the blend layer of polyester and polyethylene in the sealant layer is a laminated structure of two or more layers, and the blend ratio of polyester to polyethylene is increased in the layer closer to the intermediate layer side layer. A laminated material for a liquid paper container according to the first aspect of the invention.

次に、本発明の第４の発明は、シーラント層を共押出しラミネーションで製膜し、ポリエステル層とポリエチレン層とを、ポリエステルとポリエチレンとのブレンド層で接着したことを特徴とする第１乃至第３の発明に記載の液体紙容器用積層材である。   Next, according to a fourth aspect of the present invention, the sealant layer is coextruded to form a film by lamination, and the polyester layer and the polyethylene layer are bonded with a blend layer of polyester and polyethylene. 3. A laminated material for a liquid paper container according to the invention of 3.

そして、本発明の第５の発明は、接液側層のポリエチレン層の厚みが、５０μｍ以下であることを特徴とする第１乃至第４の発明に記載の液体紙容器用積層材である。   A fifth invention of the present invention is the laminated material for liquid paper containers according to the first to fourth inventions, wherein the thickness of the polyethylene layer of the liquid contact side layer is 50 μm or less.

本発明の液体紙容器用積層材は、最外層がポリエチレン層で、積層構成のシーラント層の接液側層つまり最内層がポリエチレン層であるため、充填機上の製袋工程におけるヒートシール適性が良好であり、本発明の液体紙容器用積層材を用いて作製した容器は、密封性が良好である。   Since the outermost layer is a polyethylene layer and the liquid contact side layer of the laminated sealant layer, that is, the innermost layer is a polyethylene layer, the laminated material for a liquid paper container of the present invention has heat sealability in the bag making process on the filling machine. The container produced using the laminated material for a liquid paper container of the present invention has good sealing properties.

また、本発明の液体紙容器用積層材は、シーラント層が積層構成で、中間層側層がポリエステル層で、接液側層が５０μｍ以下の厚みのポリエチレン層で、中間層側層のポリエステル層と接液側層のポリエチレン層とを、共押出しラミネーションでポリエステルとポリエチレンとのブレンド層を単層又は多層で設けて接着しており、接着のために接着剤や接着樹脂を使用していないため、内容物への積層材からの低分子量成分の移行が極めて少なく、また、シーラント層の内容物の有効成分の吸着が極めて少ないため、内容物の味覚、風味や香りなどを損なうことがない。   Further, the laminate for a liquid paper container of the present invention has a sealant layer laminated structure, an intermediate layer side layer is a polyester layer, a liquid contact side layer is a polyethylene layer having a thickness of 50 μm or less, and an intermediate layer side layer polyester layer The polyester layer and the polyethylene layer on the liquid contact side are bonded to each other by coextrusion lamination with a single layer or multiple layers of polyester and polyethylene blended, and no adhesive or adhesive resin is used for bonding. In addition, the migration of the low molecular weight component from the laminated material to the content is extremely small, and the adsorption of the active component of the content of the sealant layer is extremely small, so that the taste, flavor, aroma and the like of the content are not impaired.

次に、本発明の液体紙容器用積層材の実施の形態について、図を用いて詳細に説明する。   Next, an embodiment of the laminate for a liquid paper container of the present invention will be described in detail with reference to the drawings.

本実施形態の液体紙容器用積層材（１００）は、図１（ａ）に示すように、ヒートシール可能な外層（１１０）と、紙層を主体とする積層構成の中間層（１２０）と、内層のヒートシール性が良好なシーラント層（１３０）とからなる積層材である。外層は、ポリエチレン層であり、中間層は、紙層を主体に 各種合成樹脂層、プラスティックフィルム層、アルミニューム箔層、蒸着フィルム層などを、容器の使用目的に合わせて、各種のラミネーション加工法を用いて積層するものである。そして、シーラント層は、図１（ｂ）に示すように、積層構成であり、中間層側がポリエステル層（１３１）で、接液側がポリエチレン層（１３２）であり、中間層側のポリエステル層と接液側のポリエチレン層との間に、ポリエステルとポリエチレンとのブレンド層（１３３）を共押出しラミネーションにより製膜して、ポリエステル層とポリエチレン層を接着するものである。ブレンド層は、単層に限るものではなく、必要に応じて、２層以上の積層構造にすることができる。この場合には、中間層側層に近い層ほどポリエチレンに対するポリエステルのブレンド比率を多くするものである。ポリエチレンとポリエステルのブレンド比率としては、ポリエチレン／ポリエステルを９／１〜１／９とする範囲で設定可能である。また、ポリエステル層の厚みは、５〜５０μｍの範囲で設定可能であり、ブレンド層の厚みは、５ｍ〜５０μｍの範囲で設定可能であり、ポリエチレン層の厚みは、５〜５０μｍの範囲で設定可能である。   As shown in FIG. 1 (a), a laminated material (100) for a liquid paper container according to this embodiment includes an outer layer (110) that can be heat-sealed, and an intermediate layer (120) having a laminated structure mainly composed of paper layers. The laminated material is composed of a sealant layer (130) having good heat sealability of the inner layer. The outer layer is a polyethylene layer, and the intermediate layer is mainly a paper layer. Is used to laminate. As shown in FIG. 1B, the sealant layer has a laminated structure, the intermediate layer side is a polyester layer (131), the liquid contact side is a polyethylene layer (132), and the intermediate layer side is in contact with the polyester layer. A polyester-polyethylene blend layer (133) is coextruded between the liquid-side polyethylene layer and formed into a film by lamination to bond the polyester layer and the polyethylene layer. The blend layer is not limited to a single layer, and can have a laminated structure of two or more layers as necessary. In this case, the layer closer to the intermediate layer side layer increases the blend ratio of polyester to polyethylene. The blend ratio of polyethylene and polyester can be set within a range of 9/1 to 1/9 of polyethylene / polyester. The thickness of the polyester layer can be set in the range of 5 to 50 μm, the thickness of the blend layer can be set in the range of 5 to 50 μm, and the thickness of the polyethylene layer can be set in the range of 5 to 50 μm. It is.

以下に、本発明の具体的実施例について説明する。   Specific examples of the present invention will be described below.

＜実施例＞
まず、ラミネート加工法により、ポリエチレン層（２０μｍ厚）／紙層（坪量４００ｇ／ｍ2 ）／エチレン・メタアクリル酸共重合体層（２５μｍ厚）／アルミニューム箔層（７μｍ厚）／接着剤層（３ｇ／ｍ2 ）／ポリエチレンテレフタレートフィルム層（１２μｍ厚）構成の積層材を作製し、次に、 この積層材のポリエチレンテレフタレートフィルム層側に、接着剤層を設けて、ポリエステル層、ポリエチレンとポリエステルのブレンド層、ポリエチレン層を共押出しラミネーションにより積層して、図２に示すように、〔容器外側〕ポリエチレン層（１１１）（２０μｍ厚）／紙層（１２１）（坪量４００ｇ／ｍ2 ）／エチレン・メタアクリル酸共重合体層（１２２）（２５μｍ厚）／アルミニューム箔層（１２３）（７μｍ厚）／接着剤層（１２５）／ポリエチレンテレフタレートフィルム層（１２４）／接着剤層（１２６）／ポリエステル層（１３１）（２０μｍ厚）／ポリエチレンとポリエステルのブレンド層（１３３）（２０μｍ厚）／ポリエチレン層（１３２）（２０μｍ厚）〔容器内側〕構成の実施例の液体紙容器用積層材（１００）を作製した。なお、接着剤層の接着剤の塗布量は、３ｇ／ｍ2 であり、ブレンド層のブレンド比率は、ポリエチレン／ポリエステル＝１／１であった。 <Example>
First, a polyethylene layer (20 μm thickness) / paper layer (basis weight 400 g / m 2 ) / ethylene / methacrylic acid copolymer layer (25 μm thickness) / aluminum foil layer (7 μm thickness) / adhesive by laminating method Layer (3 g / m 2 ) / polyethylene terephthalate film layer (12 μm thick) laminated material is prepared, and then an adhesive layer is provided on the polyethylene terephthalate film layer side of the laminated material to form a polyester layer, polyethylene and Polyester blend layer and polyethylene layer were laminated by co-extrusion lamination, and as shown in FIG. 2, [outside of container] polyethylene layer (111) (20 μm thickness) / paper layer (121) (basis weight 400 g / m 2 ) / Ethylene / methacrylic acid copolymer layer (122) (25 μm thickness) / Aluminum foil layer (123) (7 μm thickness) / Adhesive (125) / polyethylene terephthalate film layer (124) / adhesive layer (126) / polyester layer (131) (20 μm thickness) / polyethylene and polyester blend layer (133) (20 μm thickness) / polyethylene layer (132) (20 μm) A laminate (100) for a liquid paper container of an example having a structure of (thickness) [inner side] was prepared. The coating amount of the adhesive of the adhesive layer is 3 g / m 2, the blend ratio of the blend layer was polyethylene / polyester = 1/1.

次に、本発明の比較例について説明する。   Next, a comparative example of the present invention will be described.

＜比較例１＞
ラミネート加工法により、図３に示すように、〔容器外側〕ポリエチレン層（１１１）（２０μｍ厚）／紙層（１２１）（坪量４００ｇ／ｍ）／エチレン・メタアクリル酸共重合体層（１２２）（２５μｍ厚）／アルミニューム箔層（１２３）（７μｍ厚）／接着剤層（１２５）／ポリエチレンテレフタレートフィルム層（１２４）／接着剤層（１２６）／ポリエチレン層（１３６）（６０μｍ厚）〔容器内側〕構成の比較例１の液体紙容器用積層材（１００）を作製した。なお、接着剤層の接着剤の塗布量は、３ｇ／ｍ2 であった。 <Comparative Example 1>
By the laminating method, as shown in FIG. 3, the [outside of the container] polyethylene layer (111) (20 μm thickness) / paper layer (121) (basis weight 400 g / m) / ethylene / methacrylic acid copolymer layer (122 ) (25 μm thickness) / aluminum foil layer (123) (7 μm thickness) / adhesive layer (125) / polyethylene terephthalate film layer (124) / adhesive layer (126) / polyethylene layer (136) (60 μm thickness) [ A laminate (100) for a liquid paper container of Comparative Example 1 having the configuration of the inside of the container was prepared. In addition, the application quantity of the adhesive agent of an adhesive bond layer was 3 g / m < 2 >.

＜比較例２＞
ラミネート加工法により、図４に示すように、〔容器外側〕ポリエチレン層（１１１）（２０μｍ厚）／紙層（１２１）（坪量４００ｇ／ｍ）／エチレン・メタアクリル酸共重合体層（１２２）（２５μｍ厚）／アルミニューム箔層（１２３）（７μｍ厚）／接着剤層（１２５）／ポリエチレンテレフタレートフィルム層（１２４）／接着剤層（１２６）／ポリエステル層（１３７）（６０μｍ厚）〔容器内側〕構成の比較例２の液体紙容器用積層材（１００）を作製した。なお、接着剤層の接着剤の塗布量は、３ｇ／ｍ2 であった。 <Comparative example 2>
By the laminating method, as shown in FIG. 4, [outside of the container] polyethylene layer (111) (20 μm thickness) / paper layer (121) (basis weight 400 g / m) / ethylene / methacrylic acid copolymer layer (122 ) (25 μm thickness) / aluminum foil layer (123) (7 μm thickness) / adhesive layer (125) / polyethylene terephthalate film layer (124) / adhesive layer (126) / polyester layer (137) (60 μm thickness) [ Container Laminate] A laminated material (100) for a liquid paper container of Comparative Example 2 having a configuration was prepared. In addition, the application quantity of the adhesive agent of an adhesive bond layer was 3 g / m < 2 >.

＜評 価＞
上述の実施例、比較例１及び比較例２の３種類の液体紙容器用積層材について、充填機適性、吸着性、低分子量成分溶出及び味覚変化について比較評価をした。なお、評価方法は次の通りである。充填機適性については、各構成の液体紙容器用積層材を充填機で製箱し、液漏れチェック液を充填して密封し、液漏れ状態を調べた。評価は、液漏れ数／総サンプル数である。吸着性については、各構成の液体紙容器用積層材で１００ｍｍ×１００ｍｍのパウチを作製し、リモネンを１００ｍｌ封入して、４０℃で１週間保管したのちに、パウチ自体の重量変化量を測定した。評価は、比較例１を１．０としたときの比率で表した。低分子量成分溶出については、各構成の液体紙容器用積層材で１５０ｍｍ×１５０ｍｍの三方シールパウチを作製し、蒸留水を充填して密封し、６０℃で２４時間保管したのち、常温に戻し、ＧＣ−ＭＳ評価で低分子量成分の定量を行った。評価は、比較例１を
１．０としたときの比率で表した。味覚変化については、各構成の液体紙容器用積層材で１５０ｍｍ×１５０ｍｍの三方シールパウチを作製し、蒸留水を充填して密封し、６０℃で２４時間保管したのち、常温に戻して官能評価を行った。なお、パネラー数は１０名であった。比較評価の結果を表１に示す。 <Evaluation>
The three types of laminates for liquid paper containers of Examples, Comparative Example 1 and Comparative Example 2 described above were comparatively evaluated for filling machine suitability, adsorptivity, elution of low molecular weight components, and taste change. The evaluation method is as follows. As for the suitability of the filling machine, the laminated materials for liquid paper containers of each configuration were boxed with a filling machine, filled with a liquid leak check solution and sealed, and the liquid leak state was examined. Evaluation is the number of liquid leaks / total number of samples. Regarding the adsorptivity, a pouch of 100 mm × 100 mm was prepared with a laminated material for liquid paper containers of each configuration, 100 ml of limonene was sealed, and after storing at 40 ° C. for 1 week, the weight change amount of the pouch itself was measured. . Evaluation was represented by the ratio when the comparative example 1 was set to 1.0. For elution of low molecular weight components, a 150 mm × 150 mm three-sided seal pouch is prepared with a laminated material for liquid paper containers of each constitution, filled with distilled water, sealed, stored at 60 ° C. for 24 hours, and then returned to room temperature. The low molecular weight component was quantified by GC-MS evaluation. Evaluation was represented by the ratio when the comparative example 1 was set to 1.0. For taste changes, a 150 mm x 150 mm three-sided seal pouch is made with a liquid paper container laminate of each configuration, filled with distilled water, sealed, stored at 60 ° C for 24 hours, and then returned to room temperature for sensory evaluation. Went. The number of panelists was 10. Table 1 shows the results of the comparative evaluation.

Figure 2007015751
表１に示すように、充填機適性については、比較例１と実施例の積層材は、充填機で製箱した容器に液漏れを発生したものがなかったが、比較例２の積層材は、充填機で製箱した容器のほぼ半数箇に液漏れが発生し、充填機適性に問題があった。吸着性については、リモネンの積層材の吸着量が、比較例１の積層材と比較して、比較例２の積層材は少なく、更に実施例の積層材は比較例２の積層材よりも少なかった。低分子量成分溶出については、比較例１の積層材と比較して、比較例２の積層材は少なく、更に実施例の積層材は比較例２の積層材よりも少なかった。味覚変化については、１０名のパネラーの官能評価では、比較例１の積層材は不要で、実施例及び比較例２の積層材は良好であった。上述の評価結果から総合評価してみると、実施例の積層材は良好であり、比較例１及び比較例２の積層材は不良であった。
Figure 2007015751
 As shown in Table 1, regarding the suitability of the filling machine, the laminated materials of Comparative Example 1 and Example did not cause any liquid leakage in the containers made by the filling machine, but the laminated material of Comparative Example 2 was Liquid leakage occurred in almost half of the containers made by the filling machine, and there was a problem in suitability of the filling machine. Regarding the adsorptivity, the amount of adsorption of the laminate of limonene is less than that of the laminate of Comparative Example 1, and the laminate of Comparative Example 2 is less than that of Comparative Example 2. It was. Regarding the elution of low molecular weight components, the laminate material of Comparative Example 2 was less than the laminate material of Comparative Example 1, and the laminate materials of Examples were less than the laminate material of Comparative Example 2. Regarding the taste change, in the sensory evaluation of 10 panelists, the laminated material of Comparative Example 1 was unnecessary, and the laminated materials of Examples and Comparative Example 2 were good. When comprehensive evaluation was performed from the above evaluation results, the laminated materials of the examples were good, and the laminated materials of Comparative Example 1 and Comparative Example 2 were poor.

（ａ）は、本発明の液体紙容器用積層材の構成を示す説明図であり、（ｂ）は、シーラント層の一例の構成を示す説明図であり、（ｃ）は、シーラント層の他の一例の構成を示す説明図である。(A) is explanatory drawing which shows the structure of the laminated material for liquid paper containers of this invention, (b) is explanatory drawing which shows a structure of an example of a sealant layer, (c) is other than a sealant layer. It is explanatory drawing which shows the structure of an example. 実施例の液体紙容器用積層材の構成を示す説明図である。It is explanatory drawing which shows the structure of the laminated material for liquid paper containers of an Example. 比較例１の液体紙容器用積層材の構成を示す説明図である。It is explanatory drawing which shows the structure of the laminated material for liquid paper containers of the comparative example 1. 比較例２の液体紙容器用積層材の構成を示す説明図である。6 is an explanatory view showing a configuration of a laminated material for a liquid paper container of Comparative Example 2. FIG.

符号の説明Explanation of symbols

１００……液体紙容器用積層材
１１０……外層
１１１，１３２，１３６……ポリエチレン層
１２０……中間層
１２１……紙層
１２２……エチレン・メタアクリル酸共重合体層
１２３……アルミニューム箔層
１２４……ポリエチレンテレフタレートフィルム層
１２５，１２６……接着剤層
１３０……シーラント層
１３１，１３７……ポリエステル層
１３３，１３４，１３５……ブレンド層 DESCRIPTION OF SYMBOLS 100 ... Laminate material 110 for liquid paper containers ... Outer layer 111,132,136 ... Polyethylene layer 120 ... Intermediate layer 121 ... Paper layer 122 ... Ethylene-methacrylic acid copolymer layer 123 ... Aluminum foil Layer 124 ... Polyethylene terephthalate film layer 125, 126 ... Adhesive layer 130 ... Sealant layer 131, 137 ... Polyester layer 133, 134, 135 ... Blend layer

Claims (5)

外層と、紙層を主体とする積層の中間層と、内層のシーラント層とからなる液体紙容器用積層材において、外層がポリエチレン層で、シーラント層が積層構成で、中間層側層がポリエステル層で、接液側層がポリエチレン層で、中間層側層と接液側層との間にポリエステルとポリエチレンとのブレンド層を設けたことを特徴とする液体紙容器用積層材。   In a liquid paper container laminate comprising an outer layer, a laminated intermediate layer mainly comprising a paper layer, and an inner sealant layer, the outer layer is a polyethylene layer, the sealant layer is a laminated structure, and the intermediate layer side layer is a polyester layer A laminate for a liquid paper container, wherein the liquid contact side layer is a polyethylene layer, and a blend layer of polyester and polyethylene is provided between the intermediate layer side layer and the liquid contact side layer. シーラント層のポリエステルとポリエチレンとのブレンド層が単層であることを特徴とする請求項１記載の液体紙容器用積層材。   The laminate for a liquid paper container according to claim 1, wherein the blend layer of polyester and polyethylene of the sealant layer is a single layer. シーラント層のポリエステルとポリエチレンとのブレンド層が２層以上の積層構成で、中間層側層に近い層ほどポリエチレンに対するポリエステルのブレンド比率を多くしたことを特徴とする請求項１記載の液体紙容器用積層材。   2. The liquid paper container according to claim 1, wherein the blend layer of polyester and polyethylene in the sealant layer is a laminated structure of two or more layers, and the layer closer to the intermediate layer has a higher blend ratio of polyester to polyethylene. Laminated material. シーラント層を共押出しラミネーションで製膜し、ポリエステル層とポリエチレン層とを、ポリエステルとポリエチレンとのブレンド層で接着したことを特徴とする請求項１乃至３のいずれかに記載の液体紙容器用積層材。   The laminate for a liquid paper container according to any one of claims 1 to 3, wherein the sealant layer is formed by coextrusion lamination, and the polyester layer and the polyethylene layer are bonded with a blend layer of polyester and polyethylene. Wood. 接液側層のポリエチレン層の厚みが、５０μｍ以下であることを特徴とする請求項１乃至４のいずれかに記載の液体紙容器用積層材。   The laminated material for a liquid paper container according to any one of claims 1 to 4, wherein the polyethylene layer of the liquid contact side layer has a thickness of 50 µm or less.
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05213337A (en) * 1992-01-24 1993-08-24 Dainippon Printing Co Ltd Multilayer paper container
JPH0615784A (en) * 1992-06-30 1994-01-25 Toppan Printing Co Ltd Paper container for liquid
JPH07205972A (en) * 1994-01-18 1995-08-08 Dainippon Printing Co Ltd Paper container
JP2000043854A (en) * 1998-07-29 2000-02-15 Dainippon Printing Co Ltd Paper container, and its manufacture
JP2001278265A (en) * 2000-03-27 2001-10-10 Toppan Printing Co Ltd Container

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05213337A (en) * 1992-01-24 1993-08-24 Dainippon Printing Co Ltd Multilayer paper container
JPH0615784A (en) * 1992-06-30 1994-01-25 Toppan Printing Co Ltd Paper container for liquid
JPH07205972A (en) * 1994-01-18 1995-08-08 Dainippon Printing Co Ltd Paper container
JP2000043854A (en) * 1998-07-29 2000-02-15 Dainippon Printing Co Ltd Paper container, and its manufacture
JP2001278265A (en) * 2000-03-27 2001-10-10 Toppan Printing Co Ltd Container

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