JP6771813B2 - Heat-shrinkable tubular laminated film and container with film - Google Patents
Heat-shrinkable tubular laminated film and container with film Download PDFInfo
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Description
本発明は一般に熱収縮性筒状積層フィルムに関するものであり、より特定的には、熱収縮時に接着層部分で剥がれないように改良された熱収縮性筒状積層フィルムに関する。この発明は、さらにそのような熱収縮性筒状積層フィルムが装着されたフィルム付き容器に関する。 The present invention generally relates to a heat-shrinkable tubular laminated film, and more specifically, to a heat-shrinkable tubular laminated film improved so as not to be peeled off at an adhesive layer portion during heat shrinkage. The present invention further relates to a film-attached container to which such a heat-shrinkable tubular laminated film is mounted.
清涼飲料、アルコール飲料、トイレタリー商品等は、瓶、缶、ペットボトル、ポリプロピレン製、ポリエチレン製等の容器に入れてラベルを付けて販売されている。ラベルには、室温において剛性があり、耐熱性や耐溶剤性に優れ、かつ自然収縮が小さい等の様々な特性を付与する目的で、樹脂組成の異なる異種材フィルムを積層した異種積層フィルムが用いられる。例えば表層（ポリエステル）／接着層／中間層（ポリスチレン）／接着層／裏層（ポリエステル）の積層構造を有するポリエステル系熱収縮性筒状積層フィルムが使用されている。 Soft drinks, alcoholic drinks, toiletry products, etc. are sold in bottles, cans, PET bottles, polypropylene, polyethylene, and other containers with labels. For the label, a different type laminated film in which different material films having different resin compositions are laminated is used for the purpose of imparting various characteristics such as rigidity at room temperature, excellent heat resistance and solvent resistance, and small natural shrinkage. Be done. For example, a polyester-based heat-shrinkable tubular laminated film having a laminated structure of a surface layer (polyester) / adhesive layer / intermediate layer (polystyrene) / adhesive layer / back layer (polyester) is used.
図５（Ａ）に示すように、従来の熱収縮性筒状積層フィルム１は、一方の端部２ａと他方の端部２ｂを有する熱収縮性基材フィルム２を備え、チューブを形成するように他方の端部２ｂの上に一方の端部２ａを重ね合わせ、重ね合わせた部分１１を溶剤シールによって溶着させてなる。これをセンターシールという。このセンターシールによって、溶着部３が形成される。熱収縮性基材フィルム２の裏面には、図示しないが印刷層が設けられている。図５（Ｂ）に示すように、熱収縮性筒状積層フィルム１を、例えばＰＥＴボトル４などの容器の側部を包むように配置し、加熱炉を通過させて、矢印Ｐ方向に熱収縮させると、図５（Ｃ）に示すように、ＰＥＴボトル４の側部に熱収縮性筒状積層フィルム１が密着して装着される。 As shown in FIG. 5A, the conventional heat-shrinkable tubular laminated film 1 includes a heat-shrinkable base film 2 having one end 2a and the other end 2b to form a tube. One end 2a is superposed on the other end 2b, and the superposed portion 11 is welded by a solvent seal. This is called the center seal. The welded portion 3 is formed by this center seal. A printing layer (not shown) is provided on the back surface of the heat-shrinkable base film 2. As shown in FIG. 5B, the heat-shrinkable tubular laminated film 1 is arranged so as to wrap the side portion of a container such as a PET bottle 4, and is passed through a heating furnace to be heat-shrinked in the direction of arrow P. As shown in FIG. 5C, the heat-shrinkable tubular laminated film 1 is closely attached to the side portion of the PET bottle 4.
しかしながら、従来の熱収縮性筒状積層フィルム１を容器に装着し、熱収縮させると、以下に述べる問題点があった。 However, when the conventional heat-shrinkable tubular laminated film 1 is attached to a container and heat-shrinked, there are problems described below.
すなわち、図６に示すように、熱収縮性基材フィルム２が、表層５（ポリエステル）／接着層６ａ／中間層７（ポリスチレン）／接着層６ｂ／裏層８（ポリエステル）で構成される場合、熱収縮性筒状積層フィルム１の熱収縮時、重ね合わせ部分１１に矢印Ｐの方向に収縮する応力が働くと、それに引っ張られて一方の端部２ａ側の接着層６ｂが剥がれ、反りあがった部分が発生し、外観が損なわれるという問題点があった。 That is, as shown in FIG. 6, when the heat-shrinkable base film 2 is composed of a surface layer 5 (polyester) / adhesive layer 6a / intermediate layer 7 (polystyrene) / adhesive layer 6b / back layer 8 (polyester). When the heat-shrinkable tubular laminated film 1 is heat-shrinked, when a stress that shrinks in the direction of the arrow P acts on the overlapped portion 11, the adhesive layer 6b on the one end portion 2a side is peeled off and warped. There was a problem that the appearance was spoiled due to the occurrence of the part.
溶着部３は、表層５（ポリエステル）と裏層８（ポリエステル）の溶け合った部分、すなわち、同種の樹脂成分の溶け合ったものであり接着力が強力であるのに対し、中間層７（ポリスチレン）と裏層８（ポリエステル）とを接着する接着層６ｂの部分は、ポリスチレンとポリエステルという異種の樹脂の接着であり、接着力が弱かったり、センターシール溶剤の局所的な液だまりやセンターシール溶剤による膨潤により、両者の接着力の不均衡が、一方の端部２ａ側の接着層６ｂの剥がれの原因と考えられる。 The welded portion 3 is a portion where the surface layer 5 (polyester) and the back layer 8 (polyester) are fused, that is, the same type of resin component is fused and has strong adhesive strength, whereas the intermediate layer 7 (polystyrene) The portion of the adhesive layer 6b that adheres the back layer 8 (polyester) to the adhesive layer 6b is an adhesion of different types of resins such as polystyrene and polyester, and the adhesive strength is weak, or due to a local pool of the center seal solvent or the center seal solvent. Due to the swelling, the imbalance of the adhesive force between the two is considered to be the cause of the peeling of the adhesive layer 6b on the one end 2a side.
このような剥がれの問題点を解決するために、特許文献１は、基材フィルムの樹脂成分を変えることによって、この問題を解決する方法を提案している。 In order to solve such a problem of peeling, Patent Document 1 proposes a method of solving this problem by changing the resin component of the base film.
特許文献２は、センターシール部にレーザーを用い貫通孔を設けることによって、この問題を解決する方法を提案している。 Patent Document 2 proposes a method for solving this problem by providing a through hole in the center seal portion using a laser.
しかしながら、発明者らは、基材フィルムの樹脂成分を変えるという解決方法や貫通孔の位置が限定される解決方法ではなく、既存の基材フィルム、既存の設備を用いて、もっと簡単な方法で上記問題を解決できないかと鋭意検討を行い、本発明を完成するに到った。 However, the inventors do not use the solution of changing the resin component of the base film or the solution of limiting the position of the through hole, but by using the existing base film and the existing equipment in a simpler method. We have earnestly investigated whether the above problems can be solved, and have completed the present invention.
すなわち、この発明の目的は、簡単な方法で上記問題を解決する、接着層剥がれのない、優れた外観を与える熱収縮性筒状積層フィルムを提供することにある。 That is, an object of the present invention is to provide a heat-shrinkable tubular laminated film that solves the above problems by a simple method, does not peel off the adhesive layer, and gives an excellent appearance.
この発明に係る熱収縮性筒状積層フィルムは、一方の端部と他方の端部を有する熱収縮性積層基材フィルムを備える。上記熱収縮性積層基材フィルムがチューブを形成するように、上記他方の端部の上に上記一方の端部を重ね合わせ、上記一方の端部の縁部付近を除いて、上記重ね合わせた部分を溶着させてなる。熱収縮性積層基材フィルムは、表層、接着層、中間層、接着層、裏層が積層されており、その表層と裏層とが同種の樹脂材料からなり、溶着部は、センターシール溶剤によって表層および裏層を構成する同種の樹脂材料が溶け合ってなり、一方の端部の縁部分で溶着されない部分の範囲は０．０ｍｍを超えて２．０ｍｍ以下である。一方の端部の縁部付近の熱収縮性積層基材フィルムの裏層と、これに重ね合わされた部分の熱収縮性積層基材フィルムの表層と、の間に、他の層が存在していない。
The heat-shrinkable tubular laminated film according to the present invention includes a heat-shrinkable laminated base film having one end and the other end. The one end was overlapped on the other end so that the heat-shrinkable laminated base film formed a tube, and the overlap was performed except for the vicinity of the edge of the one end. The parts are welded together. The heat-shrinkable laminated base film has a surface layer, an adhesive layer, an intermediate layer, an adhesive layer, and a back layer laminated, and the surface layer and the back layer are made of the same type of resin material, and the welded portion is made of a center seal solvent. The same type of resin material constituting the surface layer and the back layer is melted together, and the range of the unwelded portion at the edge portion of one end is more than 0.0 mm and 2.0 mm or less. Another layer is present between the back layer of the heat-shrinkable laminated base film near the edge of one end and the surface layer of the heat-shrinkable laminated base film in the overlapped portion. Absent.
また、上記一方の端部の縁部分で溶着されない部分の範囲は０．０ｍｍを超えて２．０ｍｍ以下である事が好ましい。０．０ｍｍであると熱収縮時に反り上がった部分が発生しやすく、２．０ｍｍを超えると重ね合せ部付近の外観が損なわれやすい。更に好ましい範囲は０．０ｍｍを超えて１．５ｍｍ以下である。 Further, the range of the non-welded portion at the edge portion of the one end portion is preferably more than 0.0 mm and 2.0 mm or less. If it is 0.0 mm, a warped portion is likely to occur during heat shrinkage, and if it exceeds 2.0 mm, the appearance near the overlapped portion is likely to be impaired. A more preferable range is more than 0.0 mm and 1.5 mm or less.
熱収縮性積層基材フィルムの一方の端部の縁部付近を溶着させていないので、熱収縮時、熱収縮性積層基材フィルムの一方の端部の縁部付近に、接着力の不均衡による応力がかからない。
Since the vicinity of the edge of one end of the heat-shrinkable laminated base film is not welded, the adhesive force is imbalanced near the edge of one end of the heat-shrinkable laminated base film during heat shrinkage. No stress is applied.
センターシール溶剤は、特に限定されないが基材フィルム表層にポリエステル系樹脂を使用する場合、１，３−ジオキソランまたはテトラヒドロフランが好ましい、またポリスチレン系樹脂を表層に使用する場合は、１，３−ジオキソラン、テトラヒドロフランまたはメチルエチルケトンが好ましい、またポリオレフィン系樹脂を表層に使用する場合は、シクロヘキサンや１，３−ジオキソランが好ましい。 The center seal solvent is not particularly limited, but when a polyester resin is used for the surface layer of the base film, 1,3-dioxolane or tetrahydrofuran is preferable, and when a polystyrene resin is used for the surface layer, 1,3-dioxolane, Tetrahydrofuran or methyl ethyl ketone is preferable, and when a polyolefin resin is used for the surface layer, cyclohexane or 1,3-dioxolane is preferable.
センターシール強度は１〜１０Ｎ／１０ｍｍである事が好ましく。更に好ましい範囲は１．５〜８Ｎ/１０ｍｍであり、より好ましくは２〜６Ｎ/１０ｍｍである。 The center seal strength is preferably 1 to 10 N / 10 mm. A more preferable range is 1.5 to 8 N / 10 mm, and a more preferable range is 2 to 6 N / 10 mm.
センターシール強度が不足する場合は表層樹脂とＳＰ値（溶解度パラメーター）の近い溶剤量を増やし、センターシール強度が高過ぎたり、センターシール部が白化、波打ちした場合は表層樹脂とＳＰ値が離れた溶剤量を増やし適宜調整する。 If the center seal strength is insufficient, increase the amount of solvent that is close to the SP value (solubility parameter) of the surface layer resin, and if the center seal strength is too high, or if the center seal part is whitened or wavy, the surface layer resin and SP value are separated. Increase the amount of solvent and adjust as appropriate.
熱収縮性積層基材フィルムには、紫外線吸収剤、アンチブロッキング剤、滑剤、静電気防止剤、抗菌剤、安定剤等、各種公知の添加剤や異なる樹脂等を合目的的に添加してもよい。
Various known additives such as ultraviolet absorbers, antiblocking agents, lubricants, antistatic agents, antibacterial agents, stabilizers, etc., and different resins may be added purposefully to the heat-shrinkable laminated base film. ..
上記熱収縮性積層基材フィルムは、センターシールできるものであればよく、特に限定されないが、ポリエステル系樹脂、ポリオレフィン系樹脂又はポリスチレン系樹脂で形成されるのが好ましい。
The heat-shrinkable laminated base film may be any one that can be center-sealed, and is not particularly limited, but is preferably formed of a polyester-based resin, a polyolefin-based resin, or a polystyrene-based resin.
上記熱収縮性積層基材フィルムは、少なくとも、表層／中間層／裏層の積層構造を有するが、必要に応じて表層と中間層の間、または裏層と中間層の間に接着層を設けてもよく、中間層は１層に限られず２層以上の複層であってもよい。
The heat-shrinkable laminated base film has at least a surface layer / intermediate layer / back layer laminated structure, but if necessary, an adhesive layer is provided between the surface layer and the intermediate layer, or between the back layer and the intermediate layer. The intermediate layer is not limited to one layer, and may be a plurality of layers having two or more layers.
ポリエステル系樹脂としては、好ましくは一般に共重合ポリエステル樹脂と呼ばれる樹脂が挙げられる。共重合ポリエステル樹脂を構成する酸成分としては公知のものでよく、例えば、テレフタル酸、イソフタル酸、フタル酸、２，６−ナフタレンジカルボン酸等のナフタレンジカルボン酸類、４，４’−ジカルボン酸ジフェニール等のジカルボキシビフェニール類、５−ｔ−ブチルイソフタル酸等の置換フタル酸類、２，２，６，６−テトラメチルビフェニル−４，４’−ジカルボン酸等の置換ジカルボキシルビフェニル類、１，１，３−トリメチル−３−フェニルインデン−４，５−ジカルボン酸及びその置換体、１，２−ジフェノキシエタン−４，４’−ジカルボン酸及びその置換体等の芳香族ジカルボン酸、シュウ酸、マロン酸、コハク酸、グルタル酸、アジピン酸、アゼライン酸、セバチン酸、ピメル酸、ウンデカン酸、ドデカンジカルボン酸、ブラシリン酸、テトラデカンジカルボン酸、タブシン酸、ノナデカンジカルボン酸、ドコリンジカルボン酸等の脂肪族ジカルボン酸及びその置換体、４，４’−ジカルボキシシクロヘキサン等の脂環族ジカルボン酸及びその置換体等が挙げられる。そしてジオール成分としては公知のものでよく、例えば、エチレングリコール、トリエチレングリコール、プロピレングリコール、ブタンジオール、１，６−ヘキサンジオール、１，１０−デカンジオール、ネオペンチルグリコール、２−メチル−２−エチル−１，３−プロパンジオール、２−ジエチル−１，３−プロパンジオール、２−エチル−２−ｎ−ブチル−１，３−プロパンジオール等の脂肪族ジオール類、１，３−シクロヘキサンジメタノール、１，４−シクロヘキサンジメタノール等の脂環族ジオール類、２，２−ビス（４’−β−ヒドロキシエトキシジフェニル）プロパン、ビス（４’−β−ヒドロキシエトキシフェニル）スルホン等のビスフェノール系化合物のエチレンオキサイド付加物、キシリレングリコール等の芳香族系のジオール類、あるいはジエチレングリコール等が挙げられる。その他、乳酸がエステル結合により重合されたポリ乳酸も含まれる。 The polyester-based resin preferably includes a resin generally called a copolymerized polyester resin. The acid component constituting the copolymerized polyester resin may be a known one, and examples thereof include terephthalic acid, isophthalic acid, phthalic acid, naphthalenedicarboxylic acids such as 2,6-naphthalenedicarboxylic acid, and 4,4'-dicarboxylic acid diphenyl. Dicarboxybiphenyls, substituted phthalates such as 5-t-butylisophthalic acid, substituted dicarboxybiphenyls such as 2,2,6,6-tetramethylbiphenyl-4,4'-dicarboxylic acid, 1,1, Aromatic dicarboxylic acids such as 3-trimethyl-3-phenylindene-4,5-dicarboxylic acid and its substitutions, 1,2-diphenoxyetane-4,4'-dicarboxylic acid and its substitutions, oxalic acid, malon Fat group such as acid, succinic acid, glutaric acid, adipic acid, azelaic acid, sebatic acid, pimelic acid, undecanoic acid, dodecanediocarboxylic acid, brushphosphoric acid, tetradecanediocarboxylic acid, tabic acid, nonadecandicarboxylic acid, docholindicarboxylic acid Examples thereof include dicarboxylic acids and their substitutes, alicyclic dicarboxylic acids such as 4,4'-dicarboxycyclohexane and their substitutes. The diol component may be a known one, for example, ethylene glycol, triethylene glycol, propylene glycol, butanediol, 1,6-hexanediol, 1,10-decanediol, neopentyl glycol, 2-methyl-2-. Aliphatic diols such as ethyl-1,3-propanediol, 2-diethyl-1,3-propanediol, 2-ethyl-2-n-butyl-1,3-propanediol, 1,3-cyclohexanedimethanol , 1,4-Cyclohexanedimethanol and other alicyclic diols, 2,2-bis (4'-β-hydroxyethoxydiphenyl) propane, bis (4'-β-hydroxyethoxyphenyl) sulfone and other bisphenol compounds Examples thereof include ethylene oxide adducts, aromatic diols such as xylylene glycol, and diethylene glycol. In addition, polylactic acid in which lactic acid is polymerized by an ester bond is also included.
ポリスチレン系樹脂とは、ポリスチレン、耐衝撃性ポリスチレン、グラフトタイプ耐衝撃性ポリスチレン、スチレン−共役ジエンブロックコポリマー、スチレン−共役ジエンブロックエラストマー、スチレン−アクリル酸アルキルエステル共重合体、スチレン−メタクリル酸メチル共重合体、ブタジエン−アクリル酸アルキル−スチレン共重合体等、スチレンを構成要素の一つとする樹脂全般をいう。ポリスチレン系樹脂は１種類であってもよいし、２種類以上の混合物としてもよい。 Styrene-based resins include polystyrene, impact-resistant polystyrene, graft-type impact-resistant polystyrene, styrene-conjugated diene block copolymer, styrene-conjugated diene block copolymer, styrene-acrylic acid alkyl ester copolymer, and styrene-methyl methacrylate. A general resin containing styrene as one of its constituent elements, such as a polymer and an alkyl-styrene copolymer of butadiene-alkyl acrylate. The polystyrene resin may be one kind or a mixture of two or more kinds.
ポリオレフィン系樹脂とは、環状オレフィン系樹脂、ポリプロピレン系樹脂、ポリエチレン系樹脂等、オレフィンを構成要素の一部とする樹脂をいう。 The polyolefin-based resin refers to a resin having an olefin as a part of its constituent elements, such as a cyclic olefin-based resin, a polypropylene-based resin, and a polyethylene-based resin.
接着層に用いられる接着性樹脂としては、異樹脂に接着性を付与出来る物であれば良く、特に限定はされないが、ポリスチレン系エラストマーやその水添物、またはそれらの酸変性物、ポリエステル系エラストマーやその酸変性物、ポリオレフィン系エラストマーやその酸変性物、エチレンビニルアセテート、ＥＥＡ、表層と中間層の同類樹脂の混合物で構成される事が好ましい。 The adhesive resin used for the adhesive layer may be any resin that can impart adhesiveness to different resins, and is not particularly limited. It is preferably composed of an acid-modified product thereof, a polyolefin-based elastomer or an acid-modified product thereof, ethylene vinyl acetate, EEA, and a mixture of similar resins of the surface layer and the intermediate layer.
熱収縮性積層基材フィルムは、優れた熱収縮性を発現するために、少なくとも一方向に延伸された一軸延伸フィルムである事が好ましい。熱収縮性積層基材フィルム２は、その幅方向、即ち筒状体の周方向に熱収縮する事が好ましいが、筒状体の上下方向にも収縮する二軸延伸フィルムであっても良い。熱収縮性積層基材フィルム２の熱収縮率としては、筒状体の周方向に対して、１０〜８０％（８０℃の温水に１０秒間浸漬）である事が好ましく、１５〜７５％である事がより好ましく、２０〜７０％である事が特に好ましい。上記収縮率は延伸する倍率や温度で適宜調整する事が出来る。
The heat-shrinkable laminated base film is preferably a uniaxially stretched film stretched in at least one direction in order to exhibit excellent heat-shrinkability. The heat-shrinkable laminated base film 2 is preferably heat-shrinkable in the width direction, that is, in the circumferential direction of the tubular body, but may be a biaxially stretched film that also shrinks in the vertical direction of the tubular body. The heat shrinkage of the heat-shrinkable laminated base film 2 is preferably 10 to 80% (immersed in warm water at 80 ° C. for 10 seconds) with respect to the circumferential direction of the tubular body, and is preferably 15 to 75%. It is more preferable that there is, and it is particularly preferable that it is 20 to 70%. The shrinkage rate can be appropriately adjusted by the stretching ratio and temperature.
熱収縮性積層基材フィルムの厚みとしては、特に限定されないが、１０〜１００μｍである事が好ましく、１５〜９０μｍである事がより好ましく、２０〜８０μｍである事が特に好ましい。
The thickness of the heat-shrinkable laminated base film is not particularly limited, but is preferably 10 to 100 μm, more preferably 15 to 90 μm, and particularly preferably 20 to 80 μm.
熱収縮性積層基材フィルムは、特に限定されないがセンターシール工程の前後において必要に応じて、容器に装着したフィルムを廃棄する際に容易に切り離せる様に針やレーザー等を用いて貫通孔を設けてもよい。
The heat-shrinkable laminated base film is not particularly limited, but if necessary before and after the center sealing process, through holes are formed by using a needle, a laser, or the like so that the film attached to the container can be easily separated when it is discarded. It may be provided.
本発明に係る熱収縮性筒状積層フィルムによれば、熱収縮性積層基材フィルムの一方の端部の縁部付近を溶着させていないので、熱収縮時、熱収縮性積層基材フィルムの一方の端部の縁部付近に接着力の不均衡による応力がかからない。そのため、一方の端部側の、中間層と裏層を接着している接着層に応力が働かない。その結果、一方の端部側の接着層が剥がれないので、優れた外観を与える熱収縮性筒状積層フィルムが得られる。
According to the heat-shrinkable tubular laminated film according to the present invention, since the vicinity of the edge of one end of the heat-shrinkable laminated base film is not welded, the heat-shrinkable laminated base film during heat shrinkage. No stress is applied near the edge of one end due to imbalance of adhesive force. Therefore, no stress acts on the adhesive layer that adheres the intermediate layer and the back layer on one end side. As a result, since the adhesive layer on one end side is not peeled off, a heat-shrinkable tubular laminated film giving an excellent appearance can be obtained.
接着層剥がれのない、優れた外観を与える熱収縮性筒状積層フィルムを得るという目的を、重ね合わせた部分の外側に位置する一方の端部の縁部付近を溶着させないことによって実現した。以下、この発明の実施例を、図を用いて説明する。各図中、同一又は相当する部分には同一の参照番号を付し、その説明を繰り返さない。 The purpose of obtaining a heat-shrinkable tubular laminated film that does not peel off the adhesive layer and gives an excellent appearance was realized by not welding the vicinity of the edge of one end located outside the overlapped portion. Hereinafter, examples of the present invention will be described with reference to the drawings. In each figure, the same or corresponding parts are given the same reference numbers, and the description is not repeated.
図１（Ａ）、（Ｃ）を参照して、実施例１に係る熱収縮性筒状積層フィルム１は、一方の端部２ａと他方の端部２ｂを有する熱収縮性積層基材フィルム２を備える。熱収縮性積層基材フィルム２には、表裏層にポリエステル系樹脂を主成分として用い、中間層にポリスチレン系樹脂を主成分として用い、接着層にはポリスチレン系エラストマーを主成分として使用した。チューブを形成するように他方の端部２ｂの上に一方の端部２ａを重ね合わせ、一方の端部２ａの縁部１０付近を除いて、重ね合わせ部分１１を溶剤シールにより溶着させてなる。すなわち、一方の端部２ａの縁部１０付近には、溶着部３は形成されていない。
With reference to FIGS. 1A and 1C, the heat-shrinkable tubular laminated film 1 according to the first embodiment is a heat-shrinkable laminated base film 2 having one end 2a and the other end 2b. To be equipped with. In the heat-shrinkable laminated base film 2, a polyester-based resin was used as a main component in the front and back layers, a polystyrene-based resin was used as a main component in the intermediate layer, and a polystyrene-based elastomer was used as a main component in the adhesive layer. One end 2a is superposed on the other end 2b so as to form a tube, and the superposed portion 11 is welded by a solvent seal except for the vicinity of the edge 10 of the one end 2a. That is, the welded portion 3 is not formed in the vicinity of the edge portion 10 of one end portion 2a.
図１（Ｂ）に示すように、ＰＥＴボトル４の胴部に装着して、熱収縮させると、ラベル付きのＰＥＴボトル４が得られる。熱収縮は、熱収縮性筒状積層フィルム１をＰＥＴボトル４などの胴部に装着し、装着した容器をシュリンクトンネルに通して、熱収縮させることにより行われる。ＰＥＴボトル４への内容物の充填は、容器に熱収縮性筒状積層フィルム１を装着する前に行っても良いし、シュリンクトンネルを通して収縮させた後に行っても良い。 As shown in FIG. 1B, when the PET bottle 4 is attached to the body and heat-shrinked, the PET bottle 4 with a label is obtained. The heat shrinkage is performed by mounting the heat-shrinkable tubular laminated film 1 on the body of a PET bottle 4 or the like, passing the mounted container through a shrink tunnel, and heat-shrinking the film. The contents of the PET bottle 4 may be filled before the heat-shrinkable tubular laminated film 1 is attached to the container, or after shrinking through a shrink tunnel.
動作について説明する。図１（Ｃ）に示すように、熱収縮性積層基材フィルム２は、上述の通り構成されており、表層（ポリエステル系樹脂）／接着層６ａ（ポリスチレン系エラストマー）／中間層７（ポリスチレン系樹脂）／接着層６ｂ（ポリスチレン系エラストマー）／裏層８（ポリエステル系樹脂）である。重ね合わせ部分１１に矢印Ｐの方向に収縮する力が働くが、重ね合わせ部分１１の外側に位置する一方の端部２ａの縁部１０付近を溶着させていないので、収縮時、一方の端部２ａの縁部１０付近に接着力の不均衡による応力がかからない。そのため、一方の端部２ａ側の、中間層７（ポリスチレン系樹脂）と裏層（ポリエステル系樹脂）８を接着している接着層６ｂに応力が働かない。その結果、一方の端部２ａ側の接着層６ｂが剥がれない。したがって、接着層剥がれのない、優れた外観を有する、熱収縮性筒状積層フィルム１が装着されたＰＥＴボトル４が得られる。
The operation will be described. As shown in FIG. 1C, the heat-shrinkable laminated base film 2 is configured as described above, and has a surface layer (polyester-based resin) / adhesive layer 6a (polystyrene-based elastomer) / intermediate layer 7 (polystyrene-based resin). Resin) / adhesive layer 6b (polystyrene-based elastomer) / back layer 8 (polyester-based resin). A force that contracts in the direction of the arrow P acts on the overlapped portion 11, but since the vicinity of the edge 10 of one end 2a located outside the overlapped portion 11 is not welded, one end is not welded during contraction. No stress is applied to the vicinity of the edge 10 of 2a due to the imbalance of adhesive force. Therefore, no stress acts on the adhesive layer 6b that adheres the intermediate layer 7 (polystyrene resin) and the back layer (polyester resin) 8 on one end 2a side. As a result, the adhesive layer 6b on the one end 2a side is not peeled off. Therefore, a PET bottle 4 to which the heat-shrinkable tubular laminated film 1 is attached, which has an excellent appearance without peeling of the adhesive layer, can be obtained.
上述のような熱収縮性筒状積層フィルムの製造方法を説明する。巻出軸（図示しない）から巻き出された、図２（Ａ）に示す長尺の熱収縮性積層基材フィルム２は、数本のガイドローラや後述するニップローラを経て、矢印ａの方向に流れて、巻取軸(図示せず)へ巻き取られる。この中間過程において、溶剤によるセンターシールが行われる。
The method for producing the heat-shrinkable tubular laminated film as described above will be described. The long heat-shrinkable laminated base film 2 shown in FIG. 2 (A) unwound from the unwinding shaft (not shown) passes through several guide rollers and a nip roller described later in the direction of arrow a. It flows and is wound on a take-up shaft (not shown). In this intermediate process, center sealing with a solvent is performed.
図２（Ｂ）を参照して、チューブを形成するように、長尺の熱収縮性積層基材フィルム２の他方の端部２ｂの上に一方の端部２ａを重ね合わせる。シール溶剤供給部９の塗布ノズル１３を重ね合わせ部分１１に挿入する。このとき、一方の端部２ａの縁部１０の付近に溶剤が塗布されないように、塗布ノズル１３を深く挿入する。また溶剤の量をコントロールする。ニップローラ１２，１２が、他方の端部２ｂと一方の端部１２ａとの重ね合わせ部分１１を押さえる。このようにして、一方の端部２ａの縁部１０付近を除いて、他方の端部２ｂと一方の端部１２ａとの重ね合わせた部分１１を溶着させる。得られた熱収縮性積層基材フィルム２の長尺のチューブを、断裁用刃で切断すると、図２（Ｃ）を参照して、熱収縮性筒状積層フィルム１の個片を得る。
With reference to FIG. 2B, one end 2a is overlaid on the other end 2b of the long heat shrinkable laminated substrate film 2 so as to form a tube. The coating nozzle 13 of the sealing solvent supply unit 9 is inserted into the overlapping portion 11. At this time, the coating nozzle 13 is inserted deeply so that the solvent is not applied to the vicinity of the edge portion 10 of one end portion 2a. It also controls the amount of solvent. The nip rollers 12 and 12 press the overlapping portion 11 between the other end 2b and the one end 12a. In this way, the overlapped portion 11 of the other end 2b and the one end 12a is welded except for the vicinity of the edge 10 of one end 2a. When the long tube of the obtained heat-shrinkable laminated base film 2 is cut with a cutting blade, individual pieces of the heat-shrinkable tubular laminated film 1 are obtained with reference to FIG. 2C.
図３（Ａ）、（Ｃ）を参照して、実施例３に係る熱収縮性筒状積層フィルム１は、一方
の端部２ａと他方の端部２ｂを有する熱収縮性積層基材フィルム２を備える。一方の端部２ａの縁部付近を除いて、重ね合わせた部分１１が溶剤シールにより溶着され、溶着部分３を形成している。重ね合わせた部分１１の一方の端部２ａの縁部には、メジウム１４が設けられる。図３（Ｂ）に示すように、ＰＥＴボトル４の胴部に装着して、熱収縮させると、ラベル付きのＰＥＴボトル４が得られる。
With reference to FIGS. 3A and 3C, the heat-shrinkable tubular laminated film 1 according to the third embodiment is a heat-shrinkable laminated base film 2 having one end 2a and the other end 2b. To be equipped with. Except for the vicinity of the edge portion of one end portion 2a, the overlapped portion 11 is welded by the solvent seal to form the welded portion 3. A medium 14 is provided at the edge of one end 2a of the overlapped portion 11. As shown in FIG. 3B, when the PET bottle 4 is attached to the body and heat-shrinked, the PET bottle 4 with a label is obtained.
動作について説明する。図３（Ｃ）に示すように、熱収縮性積層基材フィルム２が、例えば表層（ポリエステル系樹脂）／接着層６ａ（ポリスチレン系エラストマー）／中間層７（ポリスチレン系樹脂）／接着層６ｂ（ポリスチレン系エラストマー）／裏層８（ポリエステル系樹脂）で構成された場合、重ね合わせ部分１１矢印Ｐの方向に収縮する力が働くが、メジウム１４が設けられた部分は擬似接着であり、溶着していない。そのため、熱収縮時、重なり部分１１の外側に位置する一方の端部２ａの縁部付近に接着力の不均衡による応力がかからないので、一方の端部２ａ側の、中間層７（ポリスチレン系樹脂）と裏層８（ポリエステル系樹脂）を接着している接着層６ｂに応力がかからない。その結果、一方の端部２ａ側の接着層６ｂが剥がれないので、優れた外観を有する熱収縮性筒状積層フィルム１が装着されたＰＥＴボトル４が得られる。
The operation will be described. As shown in FIG. 3C, the heat-shrinkable laminated base film 2 is, for example, a surface layer (polyester resin) / adhesive layer 6a (polystyrene elastomer) / intermediate layer 7 (polystyrene resin) / adhesive layer 6b ( When composed of polystyrene-based elastomer) / back layer 8 (polyester-based resin), a force of contraction acts in the direction of the overlapping portion 11 arrow P, but the portion provided with the medium 14 is pseudo-adhesive and welds. Not. Therefore, during heat shrinkage, stress due to imbalance of adhesive force is not applied to the vicinity of the edge of one end 2a located outside the overlapping portion 11, so that the intermediate layer 7 (polystyrene resin) on the one end 2a side is not applied. ) And the back layer 8 (polyester resin) are bonded together. No stress is applied to the adhesive layer 6b. As a result, since the adhesive layer 6b on the one end 2a side is not peeled off, a PET bottle 4 to which the heat-shrinkable tubular laminated film 1 having an excellent appearance is attached can be obtained.
メジウムが一方の端部の縁部付近に設けられた熱収縮性筒状積層フィルムの製造方法を説明する。巻出軸（図示しない）から巻き出された、図４（Ａ）に示す、一方の端部２ａの縁部の表面側に、長尺方向に延びるメジウム１４が帯状に形成された長尺の熱収縮性積層基材フィルム２は、数本のガイドローラや後述するニップローラを経て、矢印ａの方向に流れて、巻取軸(図示せず)へ巻き取られる。この中間過程において、溶剤によるセンターシールが行われる。
A method for producing a heat-shrinkable tubular laminated film in which a medium is provided near the edge of one end will be described. A long strip of medium 14 extending in the long direction is formed on the surface side of the edge of one end 2a shown in FIG. 4A, which is unwound from a winding shaft (not shown). The heat-shrinkable laminated base film 2 flows in the direction of arrow a through several guide rollers and a nip roller described later, and is wound around a winding shaft (not shown). In this intermediate process, center sealing with a solvent is performed.
図４（Ｂ）を参照して、長尺の熱収縮性積層基材フィルム２の他方の端部２ｂの上に一方の端部２ａを重ね合わせ、シール溶剤供給部９の塗布ノズル１３を重ね合わせ部分に挿入する。溶剤を重ね合わせ部分１１に注入するが、一方の端部２ａの縁部付近には、メジウム１４が形成されているので、メジウムが形成された部分には溶剤シールの溶剤が塗布されない。ニップローラ１２，１２が、重ね合わせ部分１１を押さえる。このようにして、一方の端部２ａの縁部付近を除いて、重ね合わせた部分１１を溶剤シールにより溶着させてなる、熱収縮性積層基材フィルム２の長尺のチューブが得られる。得られた熱収縮性積層基材フィルム２の長尺のチューブを、断裁用刃で切断すると、図４（Ｃ）を参照して、熱収縮性筒状積層フィルム１の個片を得る。
With reference to FIG. 4B, one end 2a is overlaid on the other end 2b of the long heat-shrinkable laminated base film 2, and the coating nozzle 13 of the sealing solvent supply 9 is overlaid. Insert it in the mating part. The solvent is injected into the overlapping portion 11, but since the medium 14 is formed near the edge of one end 2a, the solvent of the solvent seal is not applied to the portion where the medium is formed. The nip rollers 12 and 12 hold down the overlapping portion 11. In this way, a long tube of the heat-shrinkable laminated base film 2 is obtained in which the overlapped portions 11 are welded by a solvent seal except for the vicinity of the edge portion of one end portion 2a. When the long tube of the obtained heat-shrinkable laminated base film 2 is cut with a cutting blade, individual pieces of the heat-shrinkable tubular laminated film 1 are obtained with reference to FIG. 4C.
今回開示された実施例はすべての点で例示であって制限的なものではないと考えられるべきである。本発明の範囲は上記した説明ではなくて特許請求の範囲によって示され、特許請求の範囲と均等の意味および範囲内でのすべての変更が含まれることが意図される。 The examples disclosed this time should be considered to be exemplary in all respects and not restrictive. The scope of the present invention is shown by the scope of claims rather than the above description, and it is intended to include all modifications within the meaning and scope equivalent to the scope of claims.
本発明によれば、接着層剥がれのない、優れた外観を与える熱収縮性筒状積層フィルムが得られる。 According to the present invention, a heat-shrinkable tubular laminated film that does not peel off the adhesive layer and gives an excellent appearance can be obtained.
１ 熱収縮性筒状積層フィルム
２ 熱収縮性積層基材フィルム
２ａ 一方の端部
２ｂ 他方の端部
３ 溶着部
４ ＰＥＴボトル
５ 表層
６ 接着層
７ 中間層
８ 裏層
９ シール溶剤供給部
１０ 縁部
１１ 重ね合わせ部分
１２ ニップローラ
１３ 塗布ノズル
１４ メジウム
1 Heat-shrinkable tubular laminated film 2 Heat-shrinkable laminated base film 2a One end 2b The other end 3 Welding part 4 PET bottle 5 Surface layer 6 Adhesive layer 7 Intermediate layer 8 Back layer 9 Sealing solvent supply part 10 Edge Part 11 Overlapping part 12 Nip roller 13 Application nozzle 14 Medium
Claims (2)
前記熱収縮性積層基材フィルムは、表層、接着層、中間層、接着層、裏層が積層されており、
前記熱収縮性積層基材フィルムは、前記表層と前記裏層とが同種の樹脂材料からなり、
前記熱収縮性積層基材フィルムがチューブを形成するように前記他方の端部の上に前記一方の端部を重ね合わせ、前記一方の端部の縁部付近を除いて、前記重ね合わせた部分を溶着させてなる溶着部を備え、
前記溶着部は、センターシール溶剤によって前記表層および前記裏層を構成する同種の樹脂材料が溶け合ってなり、
前記一方の端部の縁部分で溶着されない部分の範囲は０．０ｍｍを超えて２．０ｍｍ以下であり、
前記一方の端部の縁部付近の前記熱収縮性積層基材フィルムの裏層と、これに重ね合わされた部分の前記熱収縮性積層基材フィルムの表層と、の間に、他の層が存在しない、熱収縮性筒状積層フィルム。
A heat shrinkable laminated substrate film having one end and the other end
The heat-shrinkable laminated base film has a surface layer, an adhesive layer, an intermediate layer, an adhesive layer, and a back layer laminated.
The heat-shrinkable multilayer substrate film, the surface layer and said backing layer is made of a resin material of the same kind,
The one end is laminated on the other end so that the heat-shrinkable laminated base film forms a tube, and the overlapped portion except near the edge of the one end. Equipped with a welded part made by welding
The welded portion is formed by melting the same type of resin material constituting the surface layer and the back layer with a center seal solvent.
Range of the edge part are not welded portion of said one end Ri der below 2.0mm beyond 0.0 mm,
Another layer is formed between the back layer of the heat-shrinkable laminated base film near the edge of one end and the surface layer of the heat-shrinkable laminated base film on the superposed portion. Non-existent, heat-shrinkable tubular laminated film.
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| JP2008056247A (en) * | 2006-08-29 | 2008-03-13 | Gunze Ltd | Heat-shrinkable label, its manufacturing method and plastic bottle |
| JP5658179B2 (en) * | 2011-02-01 | 2015-01-21 | レンゴー株式会社 | Heat shrinkable label |
| WO2014034881A1 (en) * | 2012-08-31 | 2014-03-06 | 株式会社フジシールインターナショナル | Cylindrical shrink label and method for producing same |
| JP6078408B2 (en) * | 2013-04-08 | 2017-02-08 | グンゼ株式会社 | Heat-shrinkable cylindrical label, method for producing the same, and container equipped with the label |
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