JP2022104378A - Laminate for paper cup, and paper cup - Google Patents
Laminate for paper cup, and paper cup Download PDFInfo
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- 229920013716 polyethylene resin Polymers 0.000 claims abstract description 57
- 239000002028 Biomass Substances 0.000 claims abstract description 46
- 239000010410 layer Substances 0.000 claims abstract description 23
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- 239000011347 resin Substances 0.000 claims description 13
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 4
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 4
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 4
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- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 3
- 239000005977 Ethylene Substances 0.000 description 3
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 3
- 229910001882 dioxygen Inorganic materials 0.000 description 3
- 239000006260 foam Substances 0.000 description 3
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- 238000012360 testing method Methods 0.000 description 3
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 239000004372 Polyvinyl alcohol Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 239000002390 adhesive tape Substances 0.000 description 2
- 239000012298 atmosphere Substances 0.000 description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
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- 239000000126 substance Substances 0.000 description 2
- 239000004408 titanium dioxide Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229920002799 BoPET Polymers 0.000 description 1
- 240000003183 Manihot esculenta Species 0.000 description 1
- 235000016735 Manihot esculenta subsp esculenta Nutrition 0.000 description 1
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 description 1
- MXRIRQGCELJRSN-UHFFFAOYSA-N O.O.O.[Al] Chemical compound O.O.O.[Al] MXRIRQGCELJRSN-UHFFFAOYSA-N 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 1
- 240000000111 Saccharum officinarum Species 0.000 description 1
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- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 description 1
- 235000002017 Zea mays subsp mays Nutrition 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- SXYCCJAPZKHOLS-UHFFFAOYSA-N chembl2008674 Chemical compound [O-][N+](=O)C1=CC=C2C(N=NC3=C4C=CC=CC4=CC=C3O)=C(O)C=C(S(O)(=O)=O)C2=C1 SXYCCJAPZKHOLS-UHFFFAOYSA-N 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
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- 238000003475 lamination Methods 0.000 description 1
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 1
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- 238000005259 measurement Methods 0.000 description 1
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- 229920006284 nylon film Polymers 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
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- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
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- 229920002401 polyacrylamide Polymers 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000004626 polylactic acid Substances 0.000 description 1
- 229920006381 polylactic acid film Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
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- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 1
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Abstract
Description
本発明は、バイオマス由来のポリエチレン樹脂層を備えた紙カップ成型用積層体、及び紙カップに関するものである。 The present invention relates to a laminate for molding a paper cup provided with a polyethylene resin layer derived from biomass, and a paper cup.
持続可能な開発目標（ＳＤＧｓ）を達成すべく、化石燃料からの脱却が望まれており、その一つの手段としてバイオマス素材の活用が提案されている。 In order to achieve the Sustainable Development Goals (SDGs), it is desired to break away from fossil fuels, and the use of biomass materials has been proposed as one of the means.
バイオマス樹脂としては、ポリ乳酸（ＰＬＡ）が知られているが、ポリオレフィン、PETなどの汎用樹脂とは性質が大きく異なるため、広く普及するには至っていない。このため、再生可能な植物原料からエチレンを製造し、これを用いてバイオマス由来のポリエチレン樹脂（以下「バイオマスポリエチレン樹脂」という）を合成する取り組みが進められている（特許文献１）。 Polylactic acid (PLA) is known as a biomass resin, but it has not been widely used because its properties are significantly different from those of general-purpose resins such as polyolefin and PET. For this reason, efforts are underway to produce ethylene from renewable plant raw materials and use it to synthesize a polyethylene resin derived from biomass (hereinafter referred to as "biomass polyethylene resin") (Patent Document 1).
ところが、ポリエチレン樹脂の用途は多岐に渡るため、それぞれの用途においてバイオマスポリエチレン樹脂の最適な使用態様は明らかになっていなかった。特に、本発明の対象である紙カップ用途においては、カップにとって重要な物性である成型時のポリエチレン樹脂間で起こる界面剥離や、液漏れについては何ら考慮されていないのが実態であった（特許文献２～４）。 However, since the polyethylene resin has a wide variety of uses, the optimum usage mode of the biomass polyethylene resin has not been clarified in each use. In particular, in the paper cup application which is the object of the present invention, the fact is that no consideration is given to interfacial peeling and liquid leakage that occur between polyethylene resins during molding, which are important physical characteristics for cups (Patent Documents). 2-4).
本発明は、上記のような事情に鑑みてなされたものであり、環境負荷が小さく、成型時の界面剥離や、液体を注いだ際に液漏れしにくい紙カップ用積層体および紙カップを得ることを目的とする。 The present invention has been made in view of the above circumstances, and it is desired to obtain a laminated body for a paper cup and a paper cup which have a small environmental load and are resistant to interfacial peeling during molding and liquid leakage when a liquid is poured. The purpose.
本発明者らは、少なくとも、紙基材層と、バイオマスポリエチレン樹脂からなる内面層とを備える紙カップ成型用積層体であって、バイオマスポリエチレン樹脂の密度が0.92g/cm3以上、0.95g/cm3以下であることを特徴とする紙カップ成型用積層体により、前記課題を解決し得ることを見出した。 The present inventors are a laminate for molding a paper cup including at least a paper base material layer and an inner layer made of a biomass polyethylene resin, and the density of the biomass polyethylene resin is 0.92 g / cm 3 or more and 0.95 g / cm. It has been found that the above-mentioned problems can be solved by a laminated body for molding a paper cup, which is characterized by having 3 or less.
本発明の完成により、環境負荷が小さく、優れた物性を有する紙カップ用積層体および紙カップを製造することが可能となった。 With the completion of the present invention, it has become possible to manufacture a laminate for a paper cup and a paper cup having a small environmental load and excellent physical characteristics.
本発明は、少なくとも、紙基材層と、バイオマスポリエチレン樹脂からなる内面層とを備える紙カップ成型用積層体に関するものである。以下、詳細について説明を行う。 The present invention relates to a laminate for molding a paper cup including at least a paper base material layer and an inner surface layer made of a biomass polyethylene resin. The details will be described below.
紙基材
本発明の積層体を構成する紙基材には特に限定はないが、非塗工紙、塗工紙などを使用することができる。また、容器としての強靭さを実現する観点から紙基材の坪量は150～400g/m2とすることが好ましく、250～350g/m2とすることがより好ましい。
Paper base material The paper base material constituting the laminate of the present invention is not particularly limited, but uncoated paper, coated paper, or the like can be used. Further, from the viewpoint of realizing toughness as a container, the basis weight of the paper base material is preferably 150 to 400 g / m 2 , and more preferably 250 to 350 g / m 2 .
非塗工紙は、原料パルプにクレー、タルク、二酸化チタン、炭酸カルシウム、水酸化アルミニウム粉末等の填料を加え、必要に応じてサイズ剤、紙力増強剤、定着剤等を添加して製造することができる。また、紙面強度を向上させるため、スチレン系樹脂、スチレン・マレイン酸樹脂、澱粉、カルボキシメチル化セルロース、ポリビニルアルコール、ポリアクリルアミド等の薬品を表面に塗工してもよい。 Uncoated paper is manufactured by adding fillers such as clay, talc, titanium dioxide, calcium carbonate, aluminum hydroxide powder, etc. to the raw material pulp, and adding sizing agents, paper strength enhancers, fixing agents, etc. as necessary. be able to. Further, in order to improve the paper surface strength, a chemical such as a styrene resin, a styrene / maleic acid resin, starch, carboxymethylated cellulose, polyvinyl alcohol, or polyacrylamide may be applied to the surface.
塗工紙としては、炭酸カルシウム、二酸化チタン、水酸化アルミニウム等の顔料と、ポリビニルアルコール、スチレン・ブタジエンラテックス、メチルメタクリレート・ブタジエンラテックス等の接着剤とを含む塗工液を調整し、表面に塗工することで得ることができる。 As the coated paper, a coating liquid containing a pigment such as calcium carbonate, titanium dioxide, aluminum hydroxide and an adhesive such as polyvinyl alcohol, styrene / butadiene latex, and methylmethacrylate / butadiene latex is prepared and applied to the surface. It can be obtained by working.
内面層
本発明では、バイオマスポリエチレン樹脂からなる内面層を備えることが必要である。詳細なメカニズムは明らかではないが、内面層にバイオマスポリエチレン樹脂を用いることで、カップ強度やラミネート強度が向上することが明らかになってきた。なお、カップ強度とは、胴部と底部の接着力を指し、カップ強度を高めることで、水などを注いだ際の液漏れを防止できる。また、ラミネート強度とは、紙基材と内面層間のラミネート強度を指し、ラミネート強度を高めることで、界面剥離などの成型時のトラブルを防止できる。
Inner surface layer In the present invention, it is necessary to provide an inner surface layer made of a biomass polyethylene resin. Although the detailed mechanism is not clear, it has become clear that the use of biomass polyethylene resin for the inner layer improves the cup strength and the laminating strength. The cup strength refers to the adhesive strength between the body and the bottom, and by increasing the cup strength, it is possible to prevent liquid leakage when water or the like is poured. Further, the laminating strength refers to the laminating strength between the paper base material and the inner surface layer, and by increasing the laminating strength, troubles during molding such as interface peeling can be prevented.
ここで、バイオマスポリエチレン樹脂とは、植物由来のエチレンから合成されたポリエチレン樹脂を指す。植物由来のエチレンは、植物（トウモロコシ、サトウキビ、タピオカ等）を発酵させて得られたエタノール等を原料として、周知の方法により製造することができる。なお、本発明では、化石燃料由来のポリエチレン樹脂を石化ポリエチレン樹脂と称し、バイオマスポリエチレン樹脂と区別して扱う。 Here, the biomass polyethylene resin refers to a polyethylene resin synthesized from plant-derived ethylene. Plant-derived ethylene can be produced by a well-known method using ethanol or the like obtained by fermenting a plant (corn, sugar cane, tapioca, etc.) as a raw material. In the present invention, the polyethylene resin derived from fossil fuel is referred to as fossil polyethylene resin and is treated separately from biomass polyethylene resin.
また、「バイオマス度」（ポリオレフィン樹脂中のバイオマス由来の炭素濃度）とは、放射性炭素（Ｃ１４）測定によりバイオマス由来の炭素の含有量を測定した値であり、より具体的には、バイオベース濃度試験規格「ＡＳＴＭ－Ｄ６８６６－２０」に従った測定によって算出された、全炭素中におけるバイオマス起源の炭素の含有量（質量％）をいう。大気中の二酸化炭素にはＣ１４が一定量含まれており、大気中の二酸化炭素を取り入れて成長する植物のＣ１４の含有量も同程度である。一方、化石燃料にはＣ１４が殆ど含まれていない。したがって、ポリオレフィン樹脂に含まれるＣ１４の割合を測定することにより、ポリオレフィン樹脂中のバイオマス由来の炭素濃度「バイオマス度」を算出することができる。 The "biomass degree" (carbon concentration derived from biomass in the polyolefin resin) is a value obtained by measuring the carbon content derived from biomass by measuring radioactive carbon (C14), and more specifically, the biobase concentration. It refers to the carbon content (% by mass) of biomass origin in the total carbon calculated by the measurement according to the test standard "ASTM-D6866-20". Carbon dioxide in the atmosphere contains a certain amount of C14, and the content of C14 in plants that grow by taking in carbon dioxide in the atmosphere is about the same. On the other hand, fossil fuel contains almost no C14. Therefore, by measuring the ratio of C14 contained in the polyolefin resin, the carbon concentration "biomass degree" derived from biomass in the polyolefin resin can be calculated.
なお、本発明では、バイオマス度１００％である必要は無く、バイオマス度５％以上のポリエチレン樹脂をバイオマスポリエチレン樹脂と称する。ポリエチレン樹脂の一部をバイオマス由来の素材に置き換えれば、化石燃料の使用量を削減するという目的を達成できるためである。 In the present invention, the biomass degree does not have to be 100%, and the polyethylene resin having a biomass degree of 5% or more is referred to as a biomass polyethylene resin. This is because if a part of the polyethylene resin is replaced with a material derived from biomass, the purpose of reducing the amount of fossil fuel used can be achieved.
また、本発明では、バイオマスポリエチレン樹脂として、密度が0.93g/cm3以上、0.97g/cm3以下の高密度バイオマスポリエチレン樹脂を含むことが好ましく、0.945g/cm3以上、0.960g/cm3以下の高密度バイオマスポリエチレン樹脂を含むことがより好ましい。高密度バイオマスポリエチレン樹脂を含むことにより、カップ強度が向上し、液体を注いだ際の液漏れを防止できる。 Further, in the present invention, the biomass polyethylene resin preferably contains a high-density biomass polyethylene resin having a density of 0.93 g / cm 3 or more and 0.97 g / cm 3 or less, preferably 0.945 g / cm 3 or more and 0.960 g / cm 3 . It is more preferable to contain the following high-density biomass polyethylene resin. By containing the high-density biomass polyethylene resin, the cup strength is improved and liquid leakage can be prevented when the liquid is poured.
さらに、バイオマスポリエチレン樹脂として、密度が0.90g/cm3以上、0.93g/cm3未満の低密度バイオマスポリエチレン樹脂を含むことが好ましく、0.910g/cm3以上、0.925g/cm3以下の低密度バイオマスポリエチレン樹脂を含むことがより好ましい。低密度バイオマスポリエチレン樹脂を含むことによりラミネート強度が向上し、界面剥離を防止することができる。 Further, the biomass polyethylene resin preferably contains a low density biomass polyethylene resin having a density of 0.90 g / cm 3 or more and less than 0.93 g / cm 3 , and has a low density of 0.910 g / cm 3 or more and 0.925 g / cm 3 or less. It is more preferable to contain a biomass polyethylene resin. By containing the low density biomass polyethylene resin, the laminating strength can be improved and interfacial peeling can be prevented.
さらに、高密度バイオマスポリエチレン樹脂と低密度バイオマスポリエチレン樹脂を含むだけでなく、内面層を構成するバイオマスポリエチレン樹脂（高密度バイオマスポリエチレン樹脂と低密度バイオマスポリエチレン樹脂の混合物）の平均密度が0.92g/cm3以上、0.95g/cm3以下であることが必要であり、0.935g/cm3以上、0.945g/cm3以下であることがより好ましい。内面層を構成するバイオマスポリエチレン樹脂の平均密度をこの範囲に調整することで、液漏れや界面剥離を防止することができる。 Furthermore, the average density of the biomass polyethylene resin (mixture of the high-density biomass polyethylene resin and the low-density biomass polyethylene resin) constituting the inner layer as well as containing the high-density biomass polyethylene resin and the low-density biomass polyethylene resin is 0.92 g / cm. It is necessary to have 3 or more and 0.95 g / cm 3 or less, and more preferably 0.935 g / cm 3 or more and 0.945 g / cm 3 or less. By adjusting the average density of the biomass polyethylene resin constituting the inner layer within this range, liquid leakage and interfacial peeling can be prevented.
さらに、紙基材層と、内面層の間に、中間層を設けない方が好ましい。中間層を設けると使用する資材が増加し、環境負荷が大きくなるためである。なお、やむを得ず中間層を設ける場合には、ポリ乳酸フィルム、PETフィルム、CPPフィルム、OPPフィルムおよびナイロンフィルム等、並びにこれらのフィルムに酸化アルミニウム等を蒸着したバリアフィルムなどを適宜選択して用いることができる。なお、これらのフィルムは、バイオマス由来の原料であるか、化石燃料由来の原料であるかに係わらず使用することができる。 Further, it is preferable not to provide an intermediate layer between the paper base material layer and the inner surface layer. This is because the provision of an intermediate layer increases the amount of materials used and increases the environmental burden. If it is unavoidable to provide an intermediate layer, polylactic acid film, PET film, CPP film, OPP film, nylon film, etc., and a barrier film in which aluminum oxide or the like is vapor-deposited on these films may be appropriately selected and used. can. It should be noted that these films can be used regardless of whether they are raw materials derived from biomass or fossil fuels.
外面層
本発明では、紙基材を挟んで内面層とは反対の面に外面層を有していてもよい。外面層を設けることで、防水性や断熱性を高めることができる。
Outer surface layer In the present invention, the outer surface layer may be provided on the surface opposite to the inner surface layer with the paper base material interposed therebetween. By providing the outer surface layer, waterproofness and heat insulation can be improved.
本発明では、外面層として発泡層を設けてもよい。この際、発泡層には、密度0.91g/cm3以上、0.93g/cm3未満の低密度ポリオレフィン樹脂を用いることが好ましい。発泡層に融点の低い低密度ポリオレフィン樹脂を用いることで、発泡加工の際に内面層を発泡させることなく、外面層のみを発泡させることができる。 In the present invention, a foam layer may be provided as the outer surface layer. At this time, it is preferable to use a low-density polyolefin resin having a density of 0.91 g / cm 3 or more and less than 0.93 g / cm 3 for the foam layer. By using a low-density polyolefin resin having a low melting point for the foamed layer, it is possible to foam only the outer surface layer without foaming the inner surface layer during the foaming process.
外面層を防水層として利用する場合には、外面層の素材に特に限定はなく、ポリエチレン樹脂、ポリプロピレン樹脂、ポリエステル樹脂などを適宜利用することができる。 When the outer surface layer is used as the waterproof layer, the material of the outer surface layer is not particularly limited, and polyethylene resin, polypropylene resin, polyester resin and the like can be appropriately used.
製造方法
内面層及び外面層の形成方法には特に限定はないが、押出ラミネート等を用いることができる。
Manufacturing method The method for forming the inner surface layer and the outer surface layer is not particularly limited, but an extruded laminate or the like can be used.
押出ラミネート条件
押出ラミネートの方法としては、シングルラミネート法、タンデムラミネート法、サンドウィッチラミネート法、共押出ラミネート法などを適宜選択することができる。
Extrusion Laminating Conditions As the extrusion laminating method, a single laminating method, a tandem laminating method, a sandwich laminating method, a coextrusion laminating method, or the like can be appropriately selected.
ラミネート時のポリエチレン樹脂の（Tダイ直下）温度としては、260～350℃が好ましく、280～330℃がより好ましい。この範囲であれば、ポリエチレン樹脂層と紙基材間のラミネート強度や、を好適なものとすることができる。また、冷却ロールの表面温度は10～50℃の範囲で制御することが好ましい。 The temperature of the polyethylene resin (immediately below the T die) at the time of laminating is preferably 260 to 350 ° C, more preferably 280 to 330 ° C. Within this range, the laminating strength between the polyethylene resin layer and the paper substrate can be made suitable. Further, it is preferable to control the surface temperature of the cooling roll in the range of 10 to 50 ° C.
ラミネート後のポリエチレン樹脂層の厚みには特に限定はないが、30～150μmが好ましく、40～100μmがより好ましい。この範囲であれば、カップ成型後に充分なカップ強度を実現できる。 The thickness of the polyethylene resin layer after laminating is not particularly limited, but is preferably 30 to 150 μm, more preferably 40 to 100 μm. Within this range, sufficient cup strength can be achieved after cup molding.
また、引取速度が遅すぎると、生産性が悪いため、引取速度は40m/分以上が好ましく、60m/分がより好ましい。
一方、引取速度が速すぎると、ポリエチレン樹脂がネックインしやすく生産性が低下しやすい。したがって、引張速度は130m/分以下が好ましく、110ｍ/分以下がより好ましい。
Further, if the pick-up speed is too slow, the productivity is poor, so the pick-up speed is preferably 40 m / min or more, more preferably 60 m / min.
On the other hand, if the pick-up speed is too fast, the polyethylene resin tends to neck in and the productivity tends to decrease. Therefore, the tensile speed is preferably 130 m / min or less, more preferably 110 m / min or less.
次に、エアギャップについて説明する。ここで、エアギャップとはTダイの押出口からニップロールまでの距離を指す。 Next, the air gap will be described. Here, the air gap refers to the distance from the T-die extrusion port to the nip roll.
ラミネート加工時のエアギャップを広げすぎるとポリエチレン樹脂がネックインして生産性が低下すため、エアギャップは250mm以下が好ましく、200mm以下がより好ましい。 If the air gap during laminating is widened too much, the polyethylene resin will neck in and productivity will decrease. Therefore, the air gap is preferably 250 mm or less, more preferably 200 mm or less.
本発明では、ポリエチレン樹脂がエアギャップを通過している間に、オゾンガス及び／又は酸素ガスで表面処理することが好ましい。オゾンガス及び／又は酸素ガスで表面処理することにより、酸化被膜の形成を促進し、基材層とポリエチレン樹脂間のラミネート強度を向上させることができる。オゾンガス及び／又は酸素ガスの処理量には特に限定はないが、ポリエチレン樹脂の酸化を促進する観点で0.5mg/m2以上が好ましい。 In the present invention, it is preferable to surface-treat the polyethylene resin with ozone gas and / or oxygen gas while passing through the air gap. By surface-treating with ozone gas and / or oxygen gas, the formation of an oxide film can be promoted and the laminating strength between the base material layer and the polyethylene resin can be improved. The amount of ozone gas and / or oxygen gas to be treated is not particularly limited, but 0.5 mg / m 2 or more is preferable from the viewpoint of promoting the oxidation of the polyethylene resin.
試作例１
（工程１）紙基材の片面に、ポリエチレン樹脂（SBC818：SHC7260LS-L＝９０：１０）を押出ラミネートによって積層し、厚さ40μmの内面層を設けて積層体（試作例１）を製造した。加工条件は以下の通りである。
Prototype example 1
(Step 1) A polyethylene resin (SBC818: SHC7260LS-L = 90: 10) was laminated on one side of a paper substrate by extrusion laminating, and an inner layer having a thickness of 40 μm was provided to manufacture a laminated body (prototype example 1). .. The processing conditions are as follows.
（ラミネート加工条件）
紙基材：水分量23g/m2、坪量320g/m2
押出温度（Tダイ出口温度）：320℃
引取速度（ラミネート速度）：60ｍ/分
エアギャップ：80mm
(Laminating conditions)
Paper substrate: Moisture content 23 g / m 2 , Basis weight 320 g / m 2
Extrusion temperature (T die outlet temperature): 320 ° C
Pick-up speed (lamination speed): 60m / min Air gap: 80mm
試作例２～２４
内面層に用いるポリエチレン樹脂を表１－１、表１－２の通り変更して、試作例１と同様のラミネート条件で積層体（試作例２～２４）を製造した。本実施例で使用したポリエチレン樹脂は表２の通りである。なお、表１～３において、”LDPE”は低密度ポリエチレン樹脂、”HDPE”は高密度ポリエチレン樹脂を指す。また、バイオマスポリエチレン樹脂を”バイオ”、石化ポリエチレン樹脂を”石化”と略して表示している。
Prototype examples 2 to 24
The polyethylene resin used for the inner surface layer was changed as shown in Table 1-1 and Table 1-2 to manufacture laminated bodies (Prototype Examples 2 to 24) under the same laminating conditions as those of Prototype Example 1. Table 2 shows the polyethylene resins used in this example. In Tables 1 to 3, "LDPE" refers to a low-density polyethylene resin and "HDPE" refers to a high-density polyethylene resin. In addition, biomass polyethylene resin is abbreviated as "bio" and petrified polyethylene resin is abbreviated as "petrified".
試作例１から胴部材と底部材を切り出し、公知の紙カップ成形機を使用して紙カップ（実施例１）を作製した。また、実施例１と同様の方法で、試作例２～２４から紙カップ（実施例２～１６、比較例1～８）を作製した。
紙カップの形状は以下の通りである。
高さ；107mm（脚部の高さ：9mm）
口径；95mm（口緑部あり）
底径；64mm
テーパー角度；6.5°
A body member and a bottom member were cut out from Prototype Example 1, and a paper cup (Example 1) was produced using a known paper cup molding machine. Further, paper cups (Examples 2 to 16 and Comparative Examples 1 to 8) were produced from
The shape of the paper cup is as follows.
Height: 107 mm (leg height: 9 mm)
Caliber; 95 mm (with green mouth)
Bottom diameter; 64 mm
Taper angle; 6.5 °
評価：密度
密度勾配法によるプラスチックの密度の標準試験法（ＡＳＴＭ Ｄ１５０５－１０）に従って測定した。なお、事前に試験片(ペレットサンプルから作製)を23℃で40時間静置し、試験片の温度を安定させておいた。
Evaluation: Density Measured according to the standard test method for the density of plastics by the density gradient method (ASTM D1505-10). The test piece (prepared from the pellet sample) was allowed to stand at 23 ° C. for 40 hours in advance to stabilize the temperature of the test piece.
評価：ラミネート強度
試作例の内面層（樹脂層側）にカッターで十字の切込み（大きさ：一片約30mm、深さ：約50μm（※切込みが紙基材に達するが、基材を貫通していない程度）を入れ、当該箇所を覆うように粘着テープ（布テープ50mm、25mm巻121-50、ニチバン社製）を貼り付けて、勢いよく粘着テープを剥がした。この際の剥離界面に基づいて以下のように評価した。
なお、紙剥けしている場合と比較して、界面剥離している場合にはラミネート強度も低いため、成型時の不良が起こりやすい。
○（良好）：全面的に紙剥けしている。
※紙剥け・・・紙基材が基材破壊を起こしている状態
○△：紙剥けと紙基材/樹脂間の界面剥離が混在しており、紙剥けしている面積が大きい。
△：紙剥けと紙基材/樹脂間の界面剥離が混在しており、界面剥離している面積が大きい。
×（不良）：全面的に紙基材/樹脂間の界面剥離が起こっている。
Evaluation: Laminate strength <br /> A cross cut in the inner layer (resin layer side) of the prototype example with a cutter (size: about 30 mm per piece, depth: about 50 μm (* The cut reaches the paper base material, but the base material) The adhesive tape (cloth tape 50 mm, 25 mm roll 121-50, manufactured by Nichiban Co., Ltd.) was attached so as to cover the relevant part, and the adhesive tape was vigorously peeled off. The evaluation was made as follows based on the interface.
It should be noted that, as compared with the case where the paper is peeled off, the laminating strength is lower when the interface is peeled off, so that defects during molding are likely to occur.
○ (Good): The paper is completely peeled off.
* Paper peeling: The state where the paper base material is destroyed ○ △: Paper peeling and interface peeling between the paper base material / resin are mixed, and the area where the paper is peeled off is large.
Δ: Paper peeling and interfacial peeling between the paper base material / resin are mixed, and the area of interfacial peeling is large.
× (Defective): Interfacial peeling between the paper substrate / resin has occurred on the entire surface.
評価：液漏れ
紙カップ（実施例１～１６、比較例１～８）をそれぞれ50個用意し、ここにスコアロール液300mL充填して、30分間静置後に液漏れが発生した紙カップの個数を数えた。
スコアロール液：水1000mL、スコアロールコンク（スコアロール７００、北広ケミカル） 1mL、エリオクロムブラックT 0.5ｇ
Evaluation: Liquid leakage 50 paper cups (Examples 1 to 16 and Comparative Examples 1 to 8) were prepared, filled with 300 mL of score roll liquid, and allowed to stand for 30 minutes before the liquid leaked. I counted the number of.
Scoreroll liquid: 1000 mL of water, Scoreroll Conch (Scoreroll 700, Kitahiro Chemical) 1 mL, Eriochrome Black T 0.5 g
本実施例によれば、バイオマスポリエチレン樹脂の方が液漏れしにくい傾向であることがわかる。なお、本発明の検討過程で、カップ強度の低下、及び液漏れは以下のような理由で発生することが解ってきた。
先ず、脚部を形成する際には、熱と圧力が掛かり、ポリエチレン樹脂が少なからず流動する。ポリエチレン樹脂の厚みが多少薄くなる程度であれば液漏れには影響しないが、流動性が高い場合には、局所的にポリエチレン樹脂がほとんど存在せず、紙基材同士が相対してしまうような部位（ピンホール）が生じる。そして、ピンホールの発生した紙カップに液体を注いでしばらく静置すると、当該ピンホールから液体が紙基材に浸透して液漏れが起こる。なお、ピンホールが多いほどカップ強度が低下する傾向があるため、カップ強度の強さと液漏れには相関性が認められる。
According to this embodiment, it can be seen that the biomass polyethylene resin tends to be less likely to leak. In the process of studying the present invention, it has been found that a decrease in cup strength and liquid leakage occur for the following reasons.
First, when forming the legs, heat and pressure are applied, and the polyethylene resin flows not a little. If the thickness of the polyethylene resin is slightly thin, it does not affect the liquid leakage, but if the fluidity is high, there is almost no polyethylene resin locally, and the paper substrates face each other. A site (pinhole) is created. Then, when the liquid is poured into the paper cup in which the pinhole is generated and allowed to stand for a while, the liquid permeates the paper substrate from the pinhole and a liquid leak occurs. Since the cup strength tends to decrease as the number of pinholes increases, there is a correlation between the strength of the cup strength and the liquid leakage.
１・・・紙基材
２・・・内面層
１１・・・胴部紙基材
１２・・・胴部内面層
２１・・・底部紙基材
２２・・・底部内面層
３１・・・液漏れのルート
1 ...
Claims (4)
バイオマスポリエチレン樹脂の密度が0.92g/cm3以上、0.95g/cm3以下であることを特徴とする紙カップ成型用積層体。 A laminate for molding a paper cup including at least a paper base material layer and an inner surface layer made of a biomass polyethylene resin.
A laminate for molding paper cups, characterized in that the density of the biomass polyethylene resin is 0.92 g / cm 3 or more and 0.95 g / cm 3 or less.
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