JP2004009670A - Heat shielding wrapping film - Google Patents
Heat shielding wrapping film Download PDFInfo
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- JP2004009670A JP2004009670A JP2002169735A JP2002169735A JP2004009670A JP 2004009670 A JP2004009670 A JP 2004009670A JP 2002169735 A JP2002169735 A JP 2002169735A JP 2002169735 A JP2002169735 A JP 2002169735A JP 2004009670 A JP2004009670 A JP 2004009670A
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- 239000012790 adhesive layer Substances 0.000 claims abstract description 37
- 239000010410 layer Substances 0.000 claims abstract description 36
- 239000012785 packaging film Substances 0.000 claims description 105
- 229920006280 packaging film Polymers 0.000 claims description 105
- 229920006257 Heat-shrinkable film Polymers 0.000 claims description 71
- 239000000853 adhesive Substances 0.000 claims description 43
- 230000001070 adhesive effect Effects 0.000 claims description 42
- 238000004806 packaging method and process Methods 0.000 claims description 8
- 235000012171 hot beverage Nutrition 0.000 abstract description 19
- 238000009413 insulation Methods 0.000 abstract description 9
- 239000010408 film Substances 0.000 description 36
- 229920000139 polyethylene terephthalate Polymers 0.000 description 33
- 239000005020 polyethylene terephthalate Substances 0.000 description 33
- -1 polyethylene Polymers 0.000 description 19
- 238000011156 evaluation Methods 0.000 description 13
- 238000013461 design Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 8
- 239000012212 insulator Substances 0.000 description 7
- 239000002184 metal Substances 0.000 description 7
- 239000010409 thin film Substances 0.000 description 7
- 230000004888 barrier function Effects 0.000 description 6
- 239000011347 resin Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 241001122767 Theaceae Species 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000009529 body temperature measurement Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 229920000728 polyester Polymers 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- 239000004793 Polystyrene Substances 0.000 description 2
- 238000009459 flexible packaging Methods 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 229920002223 polystyrene Polymers 0.000 description 2
- 229920000915 polyvinyl chloride Polymers 0.000 description 2
- 239000004800 polyvinyl chloride Substances 0.000 description 2
- 239000004952 Polyamide Substances 0.000 description 1
- 235000013361 beverage Nutrition 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 235000011850 desserts Nutrition 0.000 description 1
- 230000009429 distress Effects 0.000 description 1
- 235000013611 frozen food Nutrition 0.000 description 1
- 238000007756 gravure coating Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
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- 230000037303 wrinkles Effects 0.000 description 1
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- Packages (AREA)
- Wrappers (AREA)
- Laminated Bodies (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
Description
【０００１】
【発明の属する技術分野】
本発明は、表面温度が高温である容器の表面を被覆する熱遮断性包装用フイルムであって、表面が高温のために手で直接触れることが苦痛である、ホット飲料等の容器表面の被覆に使用すれば特に有益な熱遮断性包装用フイルムを提供するものである。
【０００２】
【従来の技術】
従来から、スーパー、コンビニエンスストアー、自動販売機等で、ペットボトル、金属製ボトル缶、金属性缶等の容器に入れられたお茶やコーヒー等の飲料が数多く販売されており、そのうち保温機で保温されたいわゆるホット飲料も相当数出回っている。
そして上記のホット飲料は、保温機中で６０℃程度あるいはそれ以上の高温で保温されているのが一般的で、内容物はもちろん容器自体も非常に熱くなっているが、容器表面には特別に熱遮断性の材料が設けられているものではなかった。
【０００３】
【発明が解決しようとする課題】
上記したように、ホット飲料は、保温機中で６０℃程度あるいはそれ以上の高温で保温されているので非常に熱く、ホット飲料の購入者は、保温機から出された直後のホット飲料を直接手で触れることが苦痛であり、特に子供や幼児には非常に苦痛であった。
従って、購入したホット飲料をプラスチックフイルム製等の買物袋などに一旦入れたり、手で持たずに放置した後、少し冷めてから（容器の表面温度が少し下がってから）、手にとって飲む場合も少なくない。
また、上記ホット飲料は保温機から出された後は、徐々に冷めていくのであるが、特に冬場のように外気温が低い場合には、急激に冷めてしまい、少し時間が経つと冷めてぬるくなってしまうという問題があった。
そして上記の問題についてはほとんど対策がとられていないのが現状である。
上記問題の解決のために、容器の形状を工夫することも考えられるが、容器の形状は、商標的機能、すなわち自他商品識別力や出所表示機能を持たせるために、各メーカーが商品毎に異なったデザインの容器を使用する場合も少なくないので、形状を工夫した容器を各メーカーが各商品に一律に採用することは現実的ではない。
従って、容器の形状に影響を与えず、保温機から出された直後のホット飲料を直接手で触れても苦痛のない、そしてホット飲料の温度をある程度の時間維持することができる優れた熱遮断性を有する包装材が切望されていた。
【０００４】
本発明は、上記全ての欠点を除去したものであり、保温機から出された直後のホット飲料のように表面温度が高温である容器を直接手で触れることが容易で、該容器の温度をある程度の時間維持することができる優れた熱遮断性を有し、しかも様々な形状の容器にも使用可能な熱遮断性包装用フイルムを提供するものである。
【０００５】
【課題を解決するための手段】
（１）本発明は、厚さ２０〜１００μｍの熱収縮性フイルムの少なくとも片面に、厚さ６〜５０μｍの非熱収縮性フイルムが接着層を介して形成されている包装用フイルムであって、接着層が全面ではなく部分的に形成されており、かつ以下の条件を満足することを特徴とする熱遮断性包装用フイルムである。
ａ）熱遮断性包装用フイルムを熱収縮させた場合に、熱収縮性フイルムと非熱収縮性フイルムの接着層が形成されていない部分に空気による断熱層が形成されるｂ）熱遮断性包装用フイルムを表面温度６０℃の容器に被せた後、１０％熱収縮させて、該容器を熱遮断性包装用フイルムで被覆したときの熱遮断性包装用フイルムの表面温度が、該容器の表面温度より１℃以上低下する
（２）本発明は、接着層が、熱収縮性フイルムの収縮方向に対して直行する方向に、接着部分と非接着部分が線状に交互に形成されたものである上記（１）記載の熱遮断性包装用フイルムである。
【０００６】
本発明の熱遮断性包装用フイルムは、厚さ２０〜１００μｍの熱収縮性フイルムの少なくとも片面に、厚さ６〜５０μｍの非熱収縮性フイルムが接着層を介して形成されている包装用フイルムであって、接着層が全面ではなく部分的に形成されており、熱収縮させた場合に、熱収縮性フイルムと非熱収縮性フイルムの接着層が形成されていない部分に空気による断熱層が形成され、しかも熱遮断性包装用フイルムを表面温度６０℃の容器に被せた後、１０％熱収縮させて、該容器を熱遮断性包装用フイルムで被覆したときの熱遮断性包装用フイルムの表面温度が、該容器の表面温度より１℃以上低下するものである。
【０００７】
従って、本発明の熱遮断性包装用フイルムは、該熱遮断性包装用フイルムを表面温度が高温（５０〜８０℃程度）の容器に被せた後熱収縮して使用することにより、該熱遮断性包装用フイルムの断熱効果により、該熱遮断性包装用フイルムで被覆された部分の表面温度を、該熱遮断性包装用フイルムで被覆されていない部分の容器の温度より低下させることができるので、例えば本発明の該熱遮断性包装用フイルムをホット飲料容器に使用すれば、保温機から出された直後のホット飲料を直接手で触れても苦痛のない、しかもホット飲料の温度をある程度の時間維持することができるという優れた熱遮断性を有するものとなるのである。
【０００８】
また、本発明の熱遮断性包装用フイルムの接着層を、熱収縮性フイルムの収縮方向に対して直行する方向に、接着部分と非接着部分が線状に交互になるように形成しておけば、空気による断熱層が線状に交互に並ぶため、いわゆる煙突効果により熱が蓄積されずに逃げ易いので、より熱遮断性が向上するので好ましい。
【０００９】
【発明の実施の形態】
本発明の熱遮断性包装用フイルムは、厚さ２０〜１００μｍの熱収縮性フイルムの少なくとも片面に、厚さ６〜５０μｍの非熱収縮性フイルムが接着層を介して形成されている包装用フイルムであって、接着層が全面ではなく部分的に形成されているものである。
そして、本発明の熱遮断性包装用フイルムは、熱収縮することで、熱収縮性フイルムと非熱収縮性フイルムの接着層が形成されていない部分に空気による断熱層が形成されるので、該熱遮断性包装用フイルムを表面温度６０℃の容器に被せた後、１０％熱収縮（熱収縮率１０％）させて、該容器を熱遮断性包装用フイルムで被覆したときの熱遮断性包装用フイルムの表面温度を、該容器の表面温度より１℃以上低下することができるとともに、該容器の温度をある程度の時間維持することができる優れた熱遮断性を有するものである。
尚、上記で示した、熱遮断性包装用フイルムで被覆したときの熱遮断性包装用フイルムの表面温度は、当然のことながら大気温度より下がることはない。
従って、本発明の熱遮断性包装用フイルムを表面温度６０℃の容器に被せた後、１０％熱収縮させて、該容器を熱遮断性包装用フイルムで被覆したときの熱遮断性包装用フイルムの表面温度は、該容器の表面温度より１℃以上低下し、かつ大気温度以上となる。
【００１０】
ここで、熱遮断性の客観的指標である上記該表面温度は、接触式温度計で測定した温度であるが、実際には接触式温度計を押し付けるときの力（圧力）で測定温度が相当（数℃〜十数℃）変化してしまう。
従って、測定温度のばらつきを抑制し、正確さを担保するために、接触式温度計を熱遮断性包装用フイルム表面に相当強い圧力で押し付けて、空気による断熱層がある程度変形した状態で測定した。
このときの状態は、あたかも容器を手で強く握り締めた状態とほぼ同じである。
【００１１】
従って、熱遮断性包装用フイルムで被覆された容器の熱遮断性包装用フイルムが被覆されている部分を通常程度の強さで手に持った場合には、空気による断熱層の変化は少なく、実際手に感じる温度（体感温度）は、接触式温度計で測定した温度よりも数℃〜十数℃低く感じるのである。
よって、熱遮断性包装用フイルムを表面温度６０℃の容器に被せた後、１０％熱収縮（熱収縮率１０％）させて、該容器を熱遮断性包装用フイルムで被覆したときの熱遮断性包装用フイルムの表面温度が、該容器の表面温度より１℃以上低ければ、体感温度は接触式温度計で測定した温度よりも数℃〜十数℃低下することとなるので、表面温度６０℃の容器でも苦にせず手で持つことができるのである。
【００１２】
また、上記該体感温度、すなわち熱遮断性包装用フイルムの熱遮断性は、通常熱収縮率を高くする程向上する。
この理由は、熱収縮率を高くする程、空気による断熱層が密に形成されるので、単位面積当たりの断熱層の数が増えるとともに、断熱層が密に形成されることで断熱層自体の構造が強固になり、熱遮断性包装用フイルムを持ったときの手の圧力でも断熱層の形状が変化し難くなるからである。
従って、本発明の熱遮断性包装用フイルムを使用するときの熱収縮率は、熱遮断性のみを考慮した場合には高い程よい。
しかしコスト面や作業性を考慮した場合には、１０〜４０％程度で使用するのが好ましい。
【００１３】
そして、熱遮断性包装用フイルムの製造方法としては、例えば、厚さ２０〜１００μｍの熱収縮性フイルムの片面上に、接着剤をグラビアコーティング法等でコーティングして接着層を部分的に形成した後、厚さ６〜５０μｍの非熱収縮性フイルムを貼り合せることで、熱収縮性フイルムの片面に非熱収縮性フイルムが形成されている熱遮断性包装用フイルムを得ることができる。
上記例示の場合において、非熱収縮性フイルムの片面上に接着層を形成した後、熱収縮性フイルムを貼り合せてもよいのはもちろんである。
また、熱収縮性フイルムの両面に非熱収縮性フイルムが形成されている熱遮断性包装用フイルムを製造する場合には、例えば上記の製造方法で得た該熱遮断性包装用フイルムと非熱収縮性フイルムとを接着層でさらに貼り合せることで得ることができる。
【００１４】
本発明の熱遮断性包装用フイルムを使用する方法として、具体的には、まず本発明の熱遮断性包装用フイルムをセンターシール（端部を貼り合せる）して筒状とする。
このとき熱遮断性包装用フイルムの表裏は特に問われるものではなく、非熱収縮性フイルムが熱収縮性フイルムの片面に形成されている場合は、熱収縮性フイルムを内側あるいは外側の何れに使用しても構わず、両面に形成されている場合は、表裏何れでもよいことはいうまでもない。
次に、筒状にした熱遮断性包装用フイルムを容器に被せた後、熱収縮することにより、熱遮断性包装用フイルムが容器の形状にそって密着することで、容器を熱遮断性包装用フイルムで被覆する。
このとき、熱収縮性フイルムと非熱収縮性フイルムの接着層が形成されていない部分に空気による断熱層が形成されることにより、本発明の熱遮断性包装用フイルムがいわゆる断熱材として機能するのである。
本発明の熱遮断性包装用フイルムは、熱収縮することにより、容器の形状にそって密着するので、様々な形状の容器にも使用可能である。
【００１５】
そして、熱遮断性包装用フイルムで被覆する容器の状態は、既に保温機で高温になっている状態の容器でも、保温機に入れる前の大気温度の状態の容器の何れでもよいが、保温機に入れる前の大気温度の状態の容器を熱遮断性包装用フイルムであらかじめ被覆しておいた方が、保温機から取り出すときに、熱遮断性包装用フイルムで被覆されている部分を持つことができるので、高温の容器に直接手で触れなくて済むという利点がある。
また、本発明の熱遮断性包装用フイルムで容器を被覆する場合、被覆する部分は、容器の全部あるいは一部の何れでもよく、保温効果を重視すれば被覆する部分を多くし、断熱効果（容器を直接手で触れることが容易な程度の効果をいう）を重視すれば断熱性の必要な部分のみを被覆すればよく、目的に応じて必要な部分を被覆すればよい。
【００１６】
本発明の熱遮断性包装用フイルムに使用する熱収縮性フイルムは、熱収縮率が１０％以上の熱収縮性を有するものであり、一軸延伸フイルム及び二軸延伸フイルムの何れも使用できるが、熱収縮時の作業性や取り扱い易さから一軸延伸フイルムが好ましく、特に横一軸延伸（ＴＤ方向、すなわち長さ方向に直角の方向に延伸）フイルムが好ましい。
熱収縮性フイルムの種類は、熱収縮率が１０％以上の熱収縮性を有するフイルムであれば特に制限はなく、ポリ塩化ビニル、ポリエチレン、ポリプロピレン、ポリエステル、ポリスチレン等の各種熱収縮性フイルムが使用できる。
また、熱収縮性フイルムは透明でも不透明でもよく、着色されていてもよい。さらに、意匠性向上の目的で、熱収縮性フイルム上の全面又は一部分に印刷層や樹脂薄膜層（着色、未着色を問わない）が形成されていてもよい。
【００１７】
熱収縮性フイルムの厚さは、熱遮断性のみを考慮すれば厚い程よいが、厚くなるにつれて熱収縮に時間がかかり作業性が低下するので、熱遮断性及び作業性の両方を考慮すると、２０〜１００μｍが好ましく、３０〜７０μｍであればより好ましい。
厚さが、２０μｍより薄いと熱遮断性が低下し、１００μｍより厚いと収縮に時間がかかり作業性が低下するので好ましくない。
【００１８】
本発明の熱遮断性包装用フイルムに使用する非熱収縮性フイルムは、熱収縮率が１０％未満のフイルムであれば特に制限はなく、ポリエチレン、ポリプロピレン、ポリエステル、ポリスチレン、ポリアミド、ポリ塩化ビニル等の各種フイルムが使用できる。
また、非熱収縮性フイルムは透明でも不透明でもよく、着色されていてもよい。
さらに、意匠性向上の目的で、非熱収縮性フイルム上の全面又は一部分に印刷層、樹脂薄膜層（着色、未着色を問わない）あるいは金属薄膜層が形成されていてもよい。
【００１９】
非熱収縮性フイルムの厚さは、６〜５０μｍが好ましい。
厚さが、６μｍより薄いと熱遮断性が低下するとともに熱遮断性包装用フイルム製造時にしわが発生し易く、また５０μｍより厚いと熱収縮性フイルムの収縮を阻害するので収縮に時間がかかり作業性が低下するので好ましくない。
【００２０】
本発明の熱遮断性包装用フイルムに使用する接着層は、熱収縮フイルムと非熱収縮フイルムとの間に全面ではなく部分的に形成され、熱収縮フイルムと非熱収縮フイルムとを部分的に密着させるものである。
接着層が全面ではなく部分的に形成されることで、熱遮断性包装用フイルムを熱収縮させた場合に、熱収縮性フイルムと非熱収縮性フイルムの接着層が形成されていない部分に空気による断熱層が形成されるのである。
従って、接着層を形成する部分の形状により、空気による断熱層の形状が決定されるので、接着層の形状を適宜選択することにより、断熱層の形状を所望の形状にすることができる。
接着層を形成する部分の形状は、点状、線状、格子状、その他模様状等、熱遮断性が得られる範囲内で、意匠性も考慮して、適宜の形状に形成すればよい。
【００２１】
中でも、接着層を熱収縮性フイルムの収縮方向に対して直行する方向に、接着部分と非接着部分が線状に交互になるように形成しておけば、空気による断熱層が線状に交互に並ぶため、いわゆる煙突効果により熱が蓄積されずに逃げ易いので、より熱遮断性が向上するので好ましい。
【００２２】
そして、接着層を接着部分と非接着部分が線状に交互になるように形成する場合、接着部分と該接着部分と接する非接着部分の幅の比率が、２：８〜８：２、接着部分と該接着部分と接する非接着部分のピッチ（繰返し単位）が１〜３０ｍｍ、かつ１本の接着部分の幅が０．４ｍｍ以上であることが好ましい。
接着部分と該接着部分と接する非接着部分の幅の比率、及びピッチがそれぞれ上記範囲内でないと、熱遮断性包装用フイルムを熱収縮させたときに形成される空気による断熱層が熱遮断性を充分に発揮することができず、さらには空気による断熱層自体が形成されない場合もあるので好ましくない。
特に、上記該ピッチをあまり狭くすると、上記の欠点と共に、接着層の形成時、すなわち接着剤のコーティング時に接着剤の非接着部分へのはみだしが生じる場合があり、所望の断熱層の形状が得られず、結果的に熱遮断性や意匠性が得られなくなるので好ましくない。
また、１本の接着部分の幅が０．４ｍｍ未満であると、接着層と熱収縮性フイルム若しくは非熱収縮性フイルムとの間の密着性が低下し、センターシール時に熱遮断性包装用フイルムが破袋する危険性もあるので好ましくない。
【００２３】
本発明の熱遮断性包装用フイルムは、全体として透明あるいは不透明の何れであってもよく、着色されていてもよい。
また、樹脂薄膜層、印刷層、金属薄膜層が熱遮断性包装用フイルムの全面又は一部に形成されていてもよい。
熱遮断性包装用フイルムを全体として透明にしておけば、熱遮断性包装用フイルムで被覆した容器を熱遮断性包装用フイルムを通して視認することができるので、例えば容器表面に印刷されている商品名やデザイン等をそのまま見ることができ、熱遮断性包装用フイルム表面に別途商品名やデザイン等を印刷する必要がない。
また、熱遮断性包装用フイルムの全面又は一部に樹脂薄膜層、印刷層、金属薄膜層等を形成しておけば意匠性を向上することができる。
【００２４】
さらに、本発明の熱遮断性包装用フイルムは、センターシール時等の破袋を防止する目的で、熱遮断性包装用フイルムの片面又は両面に、熱遮断性を低下させない範囲内で微細な孔を多数形成してもよく、このようにした熱遮断性包装用フイルムも、もちろん本発明に含まれる。
上記の微細な孔の形成位置は、熱遮断性包装用フイルムの片面又は両面の、全面あるいは一部分の何れに形成されていてもよいが、熱収縮性フイルムあるいは非熱収縮性フイルムの少なくとも片方のフイルムを貫通し、かつ少なくとも非接着部分には形成されている必要がある。
上記の微細な孔の形成方法は、針やサンドペーパー等を使用して形成することができる。
形成する微細な孔の大きさ、数、形成位置等は、熱遮断性を低下させない範囲内で、破袋防止の効果を考慮して適宜決定すればよい。
【００２５】
ここで、本発明に係る熱遮断性包装用フイルムについて、図面を参照しながら説明する。
図１は、本発明に係る熱遮断性包装用フイルムの一部拡大断面図であり、熱収縮性フイルム１の片面に、接着層２が部分的に形成され、さらにその上に非熱収縮性フイルムが形成されている。
図２は、熱収縮性フイルムの収縮方向に対して直行する方向に、接着部分５と非接着部分６が線状に交互になるように形成されている本発明に係る熱遮断性包装用フイルム４を筒状にした状態を示す概略図である。
【００２６】
【実施例】
最高熱収縮率が７０％で厚さ５０μｍの透明な熱収縮性ポリエチレンテレフタレートフイルム（三菱樹脂社製 ＬＸ−１０）の片面に、幅１．３ｍｍの接着部分と幅１．５ｍｍの非接着部分を線状に交互に配列したグラビアコーターにてポリエステル系接着剤をコーティングして、熱収縮性ポリエチレンテレフタレートフイルムの収縮方向に対して直行する方向に、厚さ１．５μｍで幅１．３ｍｍの線状の接着層を１．５ｍｍ間隔に形成した積層体を得た。
次に厚さ９μｍの透明な非熱収縮性ポリエチレンテレフタレートフイルムと該積層体とを接着層面を内側にして貼り合せて、熱収縮性ポリエチレンテレフタレートフイルムの収縮方向に対して直行する方向に、幅１．３ｍｍの接着部分と幅１．５ｍｍの非接着部分を線状に交互になるように形成した、本発明の熱遮断性包装用フイルムを得た。
このとき、接着部分と該接着部分と接する非接着部分の幅の比率は、１３：１５で、接着部分と該接着部分と接する非接着部分のピッチは、２．８ｍｍである。
【００２７】
実施例で得た本発明の熱遮断性包装用フイルムについて、以下に示す評価を行って性能を比較した。
【００２８】
１．表面温度測定試験
（評価試料）保温機で６０℃に加熱した、お茶の入ったペットボトルを１１本（同一形状のもの）準備した。
次に、非熱収縮性フイルムを内側にして、該ペットボトルに被せた後に熱収縮したときの収縮率がそれぞれ、０％、１０％、２０％、３０％、４０％になるようにセンターシールした、筒状の本発明に係る熱遮断性包装用フイルムをそれぞれ１つずつ準備して試料とした（計５点）。
また、熱収縮性フイルムを内側（非熱収縮性フイルムを外側）にしたものについても、上記と同様に収縮率を変えてセンターシールした、筒状の本発明に係る熱遮断性包装用フイルムをそれぞれ１つずつ準備して試料とした（計５点）。
また、比較のため収縮率２０％になるように、実施例で使用した熱収縮性ポリエチレンテレフタレートフイルムのみをセンターシールした、筒状の熱収縮性ポリエチレンテレフタレートフイルムを１つ準備した。
次に、上記筒状の本発明に係る熱遮断性包装用フイルム１０点と、筒状の熱収縮性ポリエチレンテレフタレートフイルム１点、合計１１点をそれぞれ、保温機で６０℃に加熱されたペットボトル（ペットボトルの表面温度：６０℃）に被せた後、ドライヤーで熱収縮して、ペットボトルに密着させ、本発明に係る熱遮断性包装用フイルム、及び熱収縮性ポリエチレンテレフタレートフイルムで被覆されたペットボトルを計１１点準備した。
このとき、上記筒状の本発明に係る熱遮断性包装用フイルムのうち、収縮率０％以外の８点については、熱収縮すると収縮方向と直交する方向に、空気による断熱層が線状に交互に形成された。
一方、熱収縮性ポリエチレンテレフタレートフイルムは熱収縮しても、空気による断熱層は当然のことながら生じなかった。
また、本発明に係る熱遮断性包装用フイルムで被覆されたペットボトルは、何れも熱遮断性包装用フイルムを通して、ペットボトル表面に印刷されている商品名やデザイン等を充分に視認できるものであった。
（評価方法）作製した試料１１点を、保温機に約２０分間入れ、各試料が６０℃の恒温状態になったことを確認した後、試料を１点ずつ保温機から取り出し、熱遮断性包装用フイルム又は熱収縮性ポリエチレンテレフタレートフイルムで被覆された部分の表面温度（Ｔ）と、被覆されていない部分の表面温度すなわちペットボトルの表面温度（Ｔｏ）を、それぞれ接触式表面温度計で測定した。
尚、測定温度のばらつきを抑制し、正確さを担保するために、容器を手で強く握り締めた状態とほぼ同じ程度の圧力で、接触式温度計を熱遮断性包装用フイルム表面に押し付けて、接触式温度計の表示温度が安定した時点の値を読み取った。
（評価結果）表１
熱遮断性包装用フイルム又は熱収縮性ポリエチレンテレフタレートフイルムで被覆された部分の表面温度（Ｔ）と、被覆されていない部分の表面温度すなわちペットボトルの表面温度（Ｔｏ）との差、［Ｔｏ−Ｔ］を示す。
【００２９】
【表１】
（評価試料）表面温度測定試験と同様にした。
また、比較のために、熱遮断性包装用フイルム及び熱収縮性ポリエチレンテレフタレートフイルムで被覆されていない、保温機で６０℃に加熱したペットボトルのみも準備した。
（評価方法）１０人の人に、熱遮断性包装用フイルム又は熱収縮性ポリエチレンテレフタレートフイルムで被覆されている部分（被覆されていないペットボトルについては容器を）を手で持ってもらい、手に感じる熱さで評価した。
（評価結果）表２
熱さのためじっと持っていられないものを（６０℃に加熱したペットボトルと同じ体感温度）×、厚さが和らいで感じ、持っているのがあまり苦にならないものを△、熱さが大分和らいで感じ、持っているのがほとんど苦にならないものを○、熱さを全く感じず（温い感じ）、持っているのが全く苦にならないものを◎とした。
尚、表２の評価結果は１０人の評価のうち一番人数の多かった評価を示したものである。
また何れの試料についても、１０人中７人以上が同じ評価であった。
特に、６０℃に加熱したペットボトル、本発明の熱遮断性包装用フイルムを熱収縮率０％及び４０％で被覆した試料、熱収縮性ポリエチレンテレフタレートフイルムを熱収縮率２０％で被覆した試料については、それぞれ全員が同じ評価であった。
【００３０】
【表２】
表１、及び表２から明らかなように、ペットボトルを本発明の熱遮断性包装用フイルムで熱収縮率１０％、２０％、３０％、４０％で被覆した場合には何れも、熱遮断性包装用フイルムで被覆した部分の表面温度が、ペットボトルの表面温度より１℃以上低下し、その温度低下は熱収縮率の上昇とともに大きくなっており、また体感温度も熱収縮率の上昇とともに低くなっており、本発明の熱遮断性包装用フイルムが熱遮断性に優れていることがわかる。
これに対して、ペットボトルを本発明の熱遮断性包装用フイルムで熱収縮率０％で被覆した場合、及び熱収縮性ポリエチレンテレフタレートフイルムで熱収縮率２０％で被覆した場合には、熱遮断性包装用フイルムで被覆した部分の表面温度が、ペットボトルの表面温度と同じで、全く熱遮断性がないことがわかる。
【００３２】
【発明の効果】
本発明の熱遮断性包装用フイルムは、厚さ２０〜１００μｍの熱収縮性フイルムの少なくとも片面に、厚さ６〜５０μｍの非熱収縮性フイルムが接着層を介して形成されている包装用フイルムであって、接着層が全面ではなく部分的に形成されており、熱収縮させた場合に、熱収縮性フイルムと非熱収縮性フイルムの接着層が形成されていない部分に空気による断熱層が形成され、しかも熱遮断性包装用フイルムを表面温度６０℃の容器に被せた後、１０％熱収縮させて、該容器を熱遮断性包装用フイルムで被覆したときの熱遮断性包装用フイルムの表面温度が、該容器の表面温度より１℃以上低下するものである。
【００３３】
従って、本発明の熱遮断性包装用フイルムは、該熱遮断性包装用フイルムを表面温度が高温（５０〜８０℃程度）の容器に被せた後熱収縮して使用することにより、該熱遮断性包装用フイルムの断熱効果により、該熱遮断性包装用フイルムで被覆された部分の表面温度を、該熱遮断性包装用フイルムで被覆されていない部分の容器の温度より低下させることができるので、例えば本発明の該熱遮断性包装用フイルムをホット飲料容器に使用すれば、保温機から出された直後のホット飲料を直接手で触れても苦痛のない、しかもホット飲料の温度をある程度の時間維持することができるという優れた熱遮断性を有するものとなるのである。
【００３４】
また、本発明の熱遮断性包装用フイルムの接着層を、熱収縮性フイルムの収縮方向に対して直行する方向に、接着部分と非接着部分が線状に交互になるように形成しておけば、空気による断熱層が線状に交互に並ぶため、いわゆる煙突効果により熱が蓄積されずに逃げ易いので、より熱遮断性が向上するので好ましい。
【００３５】
本発明の熱遮断性包装用フイルムは、熱収縮することにより、容器の形状にそって密着するので、様々な形状の容器にも使用可能である。
【００３６】
本発明の熱遮断性包装用フイルムは、保温機から出された直後のホット飲料のように表面温度が高温である容器のみならず、冷蔵庫で冷えたお茶やコーヒー等の飲料が入ったペットボトル、金属製ボトル缶、金属性缶等の容器や、０℃以下に冷えている冷凍食品や冷菓等の容器に使用すれば、熱遮断性包装用フイルムで被覆されている部分は冷たさをあまり感じないので、これらの容器を直接手で触れることが容易で、しかもある程度の時間内容物の温度上昇を防止することができるという優れた熱遮断性を有するものである。
【図面の簡単な説明】
【図１】本発明の熱遮断性包装用フイルムの一部拡大断面図である。
【図２】熱収縮性フイルムの収縮方向に対して直行する方向に、接着部分５と非接着部分６が線状に交互になるように形成されている本発明に係る熱遮断性包装用フイルム４を筒状にした状態を示す概略図である。
【符号の説明】
１ 熱収縮性フイルム
２ 接着層
３ 非熱収縮性フイルム
４ 熱遮断性包装用フイルム
５ 接着部分
６ 非接着部分[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a heat-insulating packaging film for coating the surface of a container having a high surface temperature, wherein the surface of the container is difficult to directly touch by hand due to the high temperature, and the surface of a container for a hot beverage or the like is coated. The present invention provides a heat-insulating wrapping film which is particularly useful when used.
[0002]
[Prior art]
Many drinks such as tea and coffee in containers such as plastic bottles, metal bottle cans, and metal cans have been sold at supermarkets, convenience stores, vending machines, etc. A considerable number of so-called hot beverages have been sold.
In general, the above hot beverage is kept at a high temperature of about 60 ° C. or higher in a warmer, and the contents as well as the container itself are very hot. Was not provided with a heat insulating material.
[0003]
[Problems to be solved by the invention]
As described above, the hot beverage is very hot because it is kept at a high temperature of about 60 ° C. or more in the incubator, and the purchaser of the hot beverage directly drinks the hot beverage immediately after being discharged from the incubator. Touching was painful, especially for children and infants.
Therefore, the purchased hot beverage may be put in a shopping bag made of plastic film or the like, or left without being held by hand, and then cooled down a little (after the surface temperature of the container has dropped a little), and then drink it by hand. Not a few.
Also, after the hot beverage is taken out of the incubator, it gradually cools down, but especially when the outside temperature is low, such as in winter, it cools down rapidly and cools down after a while. There was a problem of getting warm.
At present, almost no countermeasures have been taken for the above problems.
In order to solve the above problem, it is conceivable to devise the shape of the container.However, the shape of the container needs to be determined by each manufacturer for each product in order to have a trademark function, that is, a self-other product identification power and a source display function. In many cases, containers with different designs are used, and it is not realistic for each manufacturer to uniformly adopt containers with devised shapes for each product.
Therefore, it does not affect the shape of the container, has no pain even if the hot beverage immediately after being discharged from the incubator is directly touched by hand, and is an excellent heat shield capable of maintaining the temperature of the hot beverage for a certain period of time. There has been a long-awaited desire for a packaging material having properties.
[0004]
The present invention eliminates all of the above disadvantages, and it is easy to directly touch a container having a high surface temperature, such as a hot beverage immediately after being discharged from an incubator, with the temperature of the container being reduced. An object of the present invention is to provide a heat-insulating packaging film which has excellent heat-insulating properties which can be maintained for a certain period of time and which can be used for containers of various shapes.
[0005]
[Means for Solving the Problems]
(1) The present invention is a packaging film in which a non-heat-shrinkable film having a thickness of 6 to 50 μm is formed on at least one surface of a heat-shrinkable film having a thickness of 20 to 100 μm via an adhesive layer, A heat-insulating packaging film characterized in that the adhesive layer is partially formed instead of the entire surface and the following conditions are satisfied.
a) When the heat-insulating packaging film is heat-shrinked, a heat-insulating layer is formed by air on a portion where the adhesive layer between the heat-shrinkable film and the non-heat-shrinkable film is not formed. After covering the container with a film having a surface temperature of 60 ° C. and subjecting the container to heat shrinkage by 10%, the surface temperature of the heat-insulating packaging film when the container is covered with the heat-insulating packaging film is determined by the surface temperature of the container. 1 ℃ lower than temperature
(2) The present invention according to (1), wherein the adhesive layer is formed such that an adhesive portion and a non-adhesive portion are alternately linearly formed in a direction perpendicular to a shrinking direction of the heat-shrinkable film. It is a heat-insulating packaging film.
[0006]
The heat-insulating packaging film of the present invention comprises a heat-shrinkable film having a thickness of 20 to 100 μm and a non-heat-shrinkable film having a thickness of 6 to 50 μm formed on at least one surface thereof via an adhesive layer. When the heat-shrinkable film is heat-shrinked, the heat-shrinkable film and the non-heat-shrinkable film have a heat-insulating layer formed by air in a portion where the adhesive layer is not formed. The formed heat-insulating packaging film is placed on a container having a surface temperature of 60 ° C., and then heat-shrinked by 10% to cover the container with the heat-insulating packaging film. The surface temperature is 1 ° C. or more lower than the surface temperature of the container.
[0007]
Therefore, the heat-insulating packaging film of the present invention is used by shrinking the heat-insulating packaging film on a container having a high surface temperature (about 50 to 80 ° C.) and then heat-shrinking it. Because of the heat insulating effect of the heat-insulating packaging film, the surface temperature of the portion covered with the heat-insulating packaging film can be lower than the temperature of the container of the portion not covered with the heat-insulating packaging film. For example, if the heat-insulating packaging film of the present invention is used for a hot beverage container, there is no pain even if the hot beverage immediately after being discharged from the warmer is directly touched, and the temperature of the hot beverage is controlled to a certain extent. It has an excellent thermal barrier property that can be maintained for a long time.
[0008]
Further, the adhesive layer of the heat-insulating packaging film of the present invention may be formed so that the adhesive portion and the non-adhesive portion are alternately linearly arranged in a direction perpendicular to the shrinking direction of the heat-shrinkable film. For example, since the heat insulating layers formed by air are alternately arranged in a line, heat is easily accumulated without accumulating due to the so-called chimney effect.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
The heat-insulating packaging film of the present invention comprises a heat-shrinkable film having a thickness of 20 to 100 μm and a non-heat-shrinkable film having a thickness of 6 to 50 μm formed on at least one surface thereof via an adhesive layer. In this case, the adhesive layer is partially formed instead of the entire surface.
The heat-insulating packaging film of the present invention is heat-shrinkable, so that a heat-insulating layer of air is formed in a portion where the adhesive layer between the heat-shrinkable film and the non-heat-shrinkable film is not formed. After covering the heat-insulating packaging film on a container having a surface temperature of 60 ° C., it is subjected to 10% heat shrinkage (heat shrinkage of 10%), and the heat-insulating packaging when the container is covered with the heat-insulating packaging film. The surface temperature of the film for use can be lowered by 1 ° C. or more from the surface temperature of the container, and the film has an excellent heat insulation property capable of maintaining the temperature of the container for a certain period of time.
The surface temperature of the heat-insulating packaging film when covered with the above-described heat-insulating packaging film does not naturally fall below the atmospheric temperature.
Therefore, the heat-insulating packaging film of the present invention is placed on a container having a surface temperature of 60 ° C. and then heat-shrinked by 10% to cover the container with the heat-insulating packaging film. Has a temperature lower than the surface temperature of the container by 1 ° C. or more, and becomes equal to or higher than the atmospheric temperature.
[0010]
Here, the above-mentioned surface temperature, which is an objective index of the thermal insulation property, is a temperature measured by a contact-type thermometer, but the measured temperature is equivalent to a force (pressure) when the contact-type thermometer is pressed. (Several degrees C to ten and several degrees C).
Therefore, in order to suppress the variation of the measurement temperature and to ensure the accuracy, the contact thermometer was pressed against the surface of the heat-insulating packaging film with a considerably strong pressure, and the measurement was performed in a state where the heat insulating layer due to air was deformed to some extent. .
The state at this time is almost the same as the state where the container is strongly squeezed with the hand.
[0011]
Therefore, when holding the portion covered with the heat-insulating packaging film of the container covered with the heat-insulating packaging film in the hand at a normal strength, the change in the heat insulating layer due to air is small, The temperature that is actually felt by the user (feeling temperature) is several degrees to several tens degrees lower than the temperature measured by the contact thermometer.
Therefore, after covering the heat-insulating packaging film on a container having a surface temperature of 60 ° C., it is subjected to a 10% heat shrinkage (heat shrinkage of 10%), and the heat insulation when the container is covered with the heat-insulating packaging film. If the surface temperature of the flexible packaging film is lower than the surface temperature of the container by 1 ° C. or more, the sensible temperature is lower by several degrees to tens of degrees Celsius than the temperature measured by a contact thermometer. Even a container at ℃ can be held by hand without distress.
[0012]
In addition, the above-mentioned sensible temperature, that is, the thermal barrier property of the thermal barrier packaging film, usually improves as the thermal shrinkage rate increases.
The reason is that the higher the heat shrinkage, the denser the heat insulating layer is formed by air, so the number of heat insulating layers per unit area increases, and the denser the heat insulating layer, the more the heat insulating layer itself becomes. This is because the structure is strengthened and the shape of the heat insulating layer is less likely to change even with hand pressure when holding the heat-insulating packaging film.
Therefore, the heat shrinkage ratio when using the heat insulating packaging film of the present invention is preferably as high as possible when only the heat insulating property is considered.
However, in consideration of cost and workability, it is preferable to use about 10 to 40%.
[0013]
As a method of manufacturing the heat-insulating packaging film, for example, an adhesive is coated on one surface of a heat-shrinkable film having a thickness of 20 to 100 μm by a gravure coating method or the like to partially form an adhesive layer. Thereafter, by bonding a non-heat-shrinkable film having a thickness of 6 to 50 μm, a film for heat-shielding packaging in which the non-heat-shrinkable film is formed on one side of the heat-shrinkable film can be obtained.
In the above example, after forming the adhesive layer on one side of the non-heat-shrinkable film, the heat-shrinkable film may be bonded.
When a heat-shrinkable packaging film in which a non-heat-shrinkable film is formed on both sides of a heat-shrinkable film is manufactured, for example, the heat-shrinkable packaging film obtained by the above-described manufacturing method may be combined with a non-heat-shrinkable film. It can be obtained by further laminating a shrinkable film with an adhesive layer.
[0014]
As a method of using the heat-insulating packaging film of the present invention, specifically, first, the heat-insulating packaging film of the present invention is formed into a cylindrical shape by center-sealing (adhering the ends).
At this time, the front and back of the heat-insulating packaging film are not particularly limited, and when the non-heat-shrinkable film is formed on one side of the heat-shrinkable film, the heat-shrinkable film is used on either the inside or the outside. It goes without saying that, if it is formed on both sides, it may be either front or back.
Next, after covering the container with the tubular heat-insulating packaging film, the container is heat-shrinked, so that the heat-insulating packaging film adheres closely to the shape of the container. And cover it with a film.
At this time, a heat insulating layer made of air is formed in a portion where the adhesive layer between the heat-shrinkable film and the non-heat-shrinkable film is not formed, so that the heat-shielding packaging film of the present invention functions as a so-called heat insulating material. It is.
Since the heat-insulating packaging film of the present invention adheres closely to the shape of the container by heat shrinkage, it can be used for containers of various shapes.
[0015]
The state of the container to be covered with the heat-insulating packaging film may be either a container already at a high temperature in the heat insulator or a container at the atmospheric temperature before being put into the heat insulator. If the container at the atmospheric temperature before being put into the container is pre-coated with the heat-insulating packaging film, it may have a part covered with the heat-insulating packaging film when it is taken out of the heat insulator. The advantage is that it is not necessary to touch the hot container directly with the hand.
When the container is covered with the heat-insulating packaging film of the present invention, the portion to be covered may be all or part of the container. If the emphasis is on the effect of directly touching the container with the hand), it is sufficient to cover only the portion that requires heat insulation, and the necessary portion may be covered according to the purpose.
[0016]
The heat-shrinkable film used for the heat-insulating packaging film of the present invention has a heat-shrinkage rate of 10% or more, and any of a uniaxially stretched film and a biaxially stretched film can be used. A uniaxially stretched film is preferable from the viewpoint of workability at the time of heat shrinkage and ease of handling, and a transverse uniaxially stretched film (stretched in a TD direction, that is, a direction perpendicular to the length direction) is particularly preferable.
The type of heat-shrinkable film is not particularly limited as long as the film has a heat-shrinkage rate of 10% or more, and various heat-shrinkable films such as polyvinyl chloride, polyethylene, polypropylene, polyester, and polystyrene are used. it can.
The heat-shrinkable film may be transparent or opaque, and may be colored. Further, for the purpose of improving design, a print layer or a resin thin film layer (regardless of color or uncolored) may be formed on the entire surface or a part of the heat-shrinkable film.
[0017]
The thickness of the heat-shrinkable film is preferably as thick as the heat-insulating property alone is taken into consideration. However, as the thickness increases, the heat-shrinkage takes time and the workability deteriorates. To 100 μm, more preferably 30 to 70 μm.
If the thickness is less than 20 μm, the thermal barrier properties decrease.
[0018]
The non-heat-shrinkable film used in the heat-insulating packaging film of the present invention is not particularly limited as long as the film has a heat shrinkage of less than 10%, and may be polyethylene, polypropylene, polyester, polystyrene, polyamide, polyvinyl chloride, or the like. Can be used.
Further, the non-heat-shrinkable film may be transparent or opaque, and may be colored.
Further, a printed layer, a resin thin film layer (regardless of color or uncolored) or a metal thin film layer may be formed on the entire surface or a part of the non-heat-shrinkable film for the purpose of improving design.
[0019]
The thickness of the non-heat-shrinkable film is preferably from 6 to 50 μm.
If the thickness is less than 6 μm, the heat-insulating property is reduced and wrinkles are likely to be produced during the production of the heat-insulating packaging film. It is not preferable because the property is lowered.
[0020]
The adhesive layer used in the heat-insulating packaging film of the present invention is formed not partially but entirely between the heat-shrinkable film and the non-heat-shrinkable film, and the heat-shrinkable film and the non-heat-shrinkable film are partially formed. This is to make them adhere.
Since the adhesive layer is partially formed instead of the entire surface, when the heat-shielding packaging film is thermally shrunk, air is applied to a portion where the adhesive layer between the heat-shrinkable film and the non-heat-shrinkable film is not formed. Thus, a heat insulating layer is formed.
Therefore, the shape of the heat insulating layer made of air is determined by the shape of the portion where the adhesive layer is formed. By appropriately selecting the shape of the adhesive layer, the shape of the heat insulating layer can be made a desired shape.
The shape of the portion where the adhesive layer is formed may be formed in an appropriate shape in consideration of the design property within a range in which the heat shielding property can be obtained, such as a dot, a line, a lattice, and a pattern.
[0021]
Above all, if the adhesive layer is formed so that the adhesive part and the non-adhesive part are alternately linearly arranged in the direction perpendicular to the shrinking direction of the heat-shrinkable film, the heat insulating layer by air alternates linearly. , Heat is not accumulated due to the so-called chimney effect and heat is easily escaped, so that the heat shielding property is further improved, which is preferable.
[0022]
When the adhesive layer is formed such that the adhesive portion and the non-adhesive portion are alternately formed in a line, the ratio of the width of the adhesive portion to the width of the non-adhesive portion in contact with the adhesive portion is 2: 8 to 8: 2. It is preferable that the pitch (repeating unit) between the portion and the non-adhesive portion in contact with the adhesive portion is 1 to 30 mm, and the width of one adhesive portion is 0.4 mm or more.
If the ratio of the width of the adhesive portion and the width of the non-adhesive portion in contact with the adhesive portion and the pitch are not within the above ranges, respectively, the heat insulating layer formed by air formed when the heat-insulating packaging film is thermally shrunk causes the heat insulating property. Is not sufficiently exhibited, and the heat insulating layer itself by air may not be formed.
In particular, if the pitch is too narrow, the above-mentioned drawbacks may be accompanied by the formation of the adhesive layer, that is, the adhesive may protrude to the non-adhesive portion when the adhesive is coated, and the desired shape of the heat insulating layer may be obtained. This is not preferable because heat insulation and design properties cannot be obtained as a result.
Further, if the width of one adhesive portion is less than 0.4 mm, the adhesiveness between the adhesive layer and the heat-shrinkable film or the non-heat-shrinkable film is reduced, and the heat-insulating film for packaging at the time of center sealing. However, there is a risk of breaking the bag, which is not preferable.
[0023]
The heat-insulating packaging film of the present invention may be transparent or opaque as a whole, or may be colored.
In addition, the resin thin film layer, the printing layer, and the metal thin film layer may be formed on the entire surface or a part of the heat insulating packaging film.
If the heat-insulating packaging film is entirely transparent, the container covered with the heat-insulating packaging film can be visually recognized through the heat-insulating packaging film. It is not necessary to separately print a product name or design on the surface of the heat-insulating packaging film.
If a resin thin film layer, a printed layer, a metal thin film layer, or the like is formed on the entire surface or a part of the heat-insulating packaging film, the design can be improved.
[0024]
Furthermore, the heat-insulating packaging film of the present invention has a fine hole in one or both sides of the heat-insulating packaging film within a range that does not reduce the heat-insulating property, for the purpose of preventing the bag from breaking at the time of center sealing or the like. May be formed in large numbers, and such a heat-insulating packaging film is of course included in the present invention.
The formation position of the fine holes may be formed on the entire surface or a part of one or both surfaces of the heat-shielding packaging film, but may be formed on at least one of the heat-shrinkable film and the non-heat-shrinkable film. It must penetrate the film and be formed at least in the non-adhered portion.
The method for forming the fine holes can be formed using a needle, sandpaper, or the like.
The size, number, formation position, and the like of the fine holes to be formed may be appropriately determined in consideration of the effect of preventing bag breakage, as long as the heat insulation is not reduced.
[0025]
Here, the heat-insulating packaging film according to the present invention will be described with reference to the drawings.
FIG. 1 is a partially enlarged cross-sectional view of a heat-insulating film for packaging according to the present invention, in which an
FIG. 2 shows a heat-insulating packaging film according to the present invention in which the
[0026]
【Example】
One side of a transparent heat-shrinkable polyethylene terephthalate film (LX-10, manufactured by Mitsubishi Plastics Co., Ltd.) having a maximum heat shrinkage of 70% and a thickness of 50 μm is provided with an adhesive portion having a width of 1.3 mm and a non-adhesive portion having a width of 1.5 mm. A polyester adhesive is coated with a gravure coater alternately arranged in a linear manner, and a 1.5 μm-thick linear 1.3 mm-wide line is formed in a direction perpendicular to the shrinking direction of the heat-shrinkable polyethylene terephthalate film. Was obtained at 1.5 mm intervals.
Next, a transparent non-heat-shrinkable polyethylene terephthalate film having a thickness of 9 μm and the laminate are bonded together with the adhesive layer surface inside, and a width of 1 μm in a direction perpendicular to the shrinkage direction of the heat-shrinkable polyethylene terephthalate film. A heat-insulating packaging film of the present invention was obtained in which a 0.3 mm adhesive portion and a 1.5 mm wide non-adhesive portion were formed alternately in a linear manner.
At this time, the ratio of the width of the adhesive portion to the non-adhesive portion in contact with the adhesive portion is 13:15, and the pitch between the adhesive portion and the non-adhesive portion in contact with the adhesive portion is 2.8 mm.
[0027]
With respect to the heat-insulating film for packaging of the present invention obtained in the examples, the following evaluation was performed and the performance was compared.
[0028]
1. Surface temperature measurement test
(Evaluation sample) Eleven PET bottles (having the same shape) containing tea, which were heated to 60 ° C. with a warmer, were prepared.
Next, the non-heat-shrinkable film is placed inside, and the center seal is applied so that the shrinkage when heat shrinking after covering the PET bottle is 0%, 10%, 20%, 30%, and 40%, respectively. One of the cylindrical heat-insulating packaging films according to the present invention was prepared and used as samples (5 points in total).
In addition, the heat-shrinkable film having the heat-shrinkable film inside (the non-heat-shrinkable film outside) also has a cylindrical heat-shrinkable packaging film according to the present invention in which the shrinkage rate is changed and the center is sealed in the same manner as described above. One sample was prepared for each (5 points in total).
Further, for comparison, one cylindrical heat-shrinkable polyethylene terephthalate film in which only the heat-shrinkable polyethylene terephthalate film used in the examples was center-sealed so as to have a shrinkage of 20%.
Next, 10 bottles of the heat-insulating packaging film according to the present invention and 1 bottle of a heat-shrinkable polyethylene terephthalate film according to the present invention, each of which is a total of 11 points, each of which is heated to 60 ° C. by a heat insulator. (Surface temperature of PET bottle: 60 ° C.), heat-shrinked with a drier, brought into close contact with the PET bottle, and covered with the heat-insulating packaging film according to the present invention and the heat-shrinkable polyethylene terephthalate film. A total of 11 PET bottles were prepared.
At this time, of the cylindrical heat-insulating packaging film according to the present invention, the air-heat-insulating layer is linearly formed in eight directions other than the shrinkage ratio of 0% in a direction orthogonal to the shrinkage direction when thermally shrunk. Formed alternately.
On the other hand, even when the heat-shrinkable polyethylene terephthalate film was shrunk by heat, a heat insulating layer was not formed due to air.
In addition, any PET bottle covered with the heat-insulating packaging film according to the present invention can be sufficiently visually recognized through the heat-insulating packaging film for the product name, design, and the like printed on the surface of the PET bottle. there were.
(Evaluation method) 11 points of the prepared samples were put into a heat insulator for about 20 minutes, and after confirming that each sample became a constant temperature state of 60 ° C., the samples were taken out of the heat insulator one by one, and then heat-insulated packaging was performed. The surface temperature (T) of the portion coated with the film for use or the heat-shrinkable polyethylene terephthalate film and the surface temperature of the portion not coated, that is, the surface temperature of the PET bottle (To), were measured with a contact surface thermometer. .
In addition, in order to suppress the variation in the measurement temperature and to ensure the accuracy, the contact thermometer is pressed against the surface of the heat-insulating packaging film with approximately the same pressure as when the container is strongly squeezed by hand, The value at the time when the display temperature of the contact thermometer was stabilized was read.
(Evaluation results) Table 1
The difference between the surface temperature (T) of the portion coated with the heat-insulating packaging film or the heat-shrinkable polyethylene terephthalate film and the surface temperature of the uncoated portion, ie, the surface temperature of the PET bottle (To), [To- T].
[0029]
[Table 1]
(Evaluation sample) The same as in the surface temperature measurement test.
For comparison, only a PET bottle heated to 60 ° C. with a heat insulator, not covered with the heat-insulating packaging film and the heat-shrinkable polyethylene terephthalate film was prepared.
(Evaluation method) Have 10 people hold the part covered with the heat-insulating packaging film or the heat-shrinkable polyethylene terephthalate film (or the container for an uncoated PET bottle) by hand. The evaluation was based on the heat felt.
(Evaluation results) Table 2
Those that can't be held because of the heat (the same sensible temperature as a PET bottle heated to 60 ° C) x, those that feel softer in thickness, and those that are not too hard to have. Those that felt and had almost no pain were marked with ○, and those that felt no heat (warm feeling) and had no difficulty at all were marked with ◎.
The evaluation results in Table 2 show the evaluation with the largest number of persons among the evaluations of ten persons.
In addition, for all samples, 7 or more out of 10 had the same evaluation.
In particular, PET bottles heated to 60 ° C., samples coated with the heat insulating packaging film of the present invention at a heat shrinkage of 0% and 40%, and samples coated with a heat shrinkable polyethylene terephthalate film at a heat shrinkage of 20% All had the same evaluation.
[0030]
[Table 2]
As is clear from Tables 1 and 2, when the PET bottle was covered with the heat-shrinkable packaging film of the present invention at a heat shrinkage of 10%, 20%, 30%, or 40%, all were heat-insulated. The surface temperature of the part covered with the wrapping film is 1 ° C or more lower than the surface temperature of the PET bottle, and the temperature decrease increases with the heat shrinkage, and the sensible temperature also increases with the heat shrinkage. This indicates that the heat-insulating packaging film of the present invention has excellent heat-insulating properties.
On the other hand, when the PET bottle is coated with the heat-shrinkable packaging film of the present invention at a heat shrinkage of 0%, and when the PET bottle is coated with a heat-shrinkable polyethylene terephthalate film at a heat shrinkage of 20%, the heat shut-off is prevented. It can be seen that the surface temperature of the portion covered with the flexible packaging film is the same as the surface temperature of the PET bottle, and there is no thermal barrier at all.
[0032]
【The invention's effect】
The heat-insulating packaging film of the present invention comprises a heat-shrinkable film having a thickness of 20 to 100 μm and a non-heat-shrinkable film having a thickness of 6 to 50 μm formed on at least one surface thereof via an adhesive layer. When the heat-shrinkable film is heat-shrinked, the heat-shrinkable film and the non-heat-shrinkable film have a heat-insulating layer formed by air in a portion where the adhesive layer is not formed. The formed heat-insulating packaging film is placed on a container having a surface temperature of 60 ° C., and then heat-shrinked by 10% to cover the container with the heat-insulating packaging film. The surface temperature is 1 ° C. or more lower than the surface temperature of the container.
[0033]
Therefore, the heat-insulating packaging film of the present invention is used by shrinking the heat-insulating packaging film on a container having a high surface temperature (about 50 to 80 ° C.) and then heat-shrinking it. Because of the heat insulating effect of the heat-insulating packaging film, the surface temperature of the portion covered with the heat-insulating packaging film can be lower than the temperature of the container of the portion not covered with the heat-insulating packaging film. For example, if the heat-insulating packaging film of the present invention is used for a hot beverage container, there is no pain even if the hot beverage immediately after being discharged from the warmer is directly touched, and the temperature of the hot beverage is controlled to a certain extent. It has an excellent thermal barrier property that can be maintained for a long time.
[0034]
Further, the adhesive layer of the heat-insulating packaging film of the present invention may be formed so that the adhesive portion and the non-adhesive portion are alternately linearly arranged in a direction perpendicular to the shrinking direction of the heat-shrinkable film. For example, since the heat insulating layers formed by air are alternately arranged in a line, heat is easily accumulated without accumulating due to the so-called chimney effect.
[0035]
Since the heat-insulating packaging film of the present invention adheres closely to the shape of the container by heat shrinkage, it can be used for containers of various shapes.
[0036]
The heat-insulating packaging film of the present invention is not only a container having a high surface temperature such as a hot beverage immediately after being discharged from an insulated machine, but also a plastic bottle containing beverages such as tea and coffee cooled in a refrigerator. If it is used for containers such as metal bottle cans, metal cans, etc., or containers for frozen foods or frozen desserts that are cooled to 0 ° C or less, the parts covered with the heat-insulating packaging film will not be too cold. Since it is not felt, it is easy to directly touch these containers by hand, and furthermore, it has an excellent heat insulation property that the temperature rise of the contents can be prevented for a certain period of time.
[Brief description of the drawings]
FIG. 1 is a partially enlarged cross-sectional view of a heat-insulating packaging film of the present invention.
FIG. 2 shows a heat-insulating packaging film according to the present invention in which
[Explanation of symbols]
1. Heat shrinkable film
2 adhesive layer
3 Non-heat-shrinkable film
4. Heat insulation film for packaging
5 Adhesive part
6 Non-adhesive part
Claims (2)
ａ）熱遮断性包装用フイルムを熱収縮させた場合に、熱収縮性フイルムと非熱収縮性フイルムの接着層が形成されていない部分に空気による断熱層が形成されるｂ）熱遮断性包装用フイルムを表面温度６０℃の容器に被せた後、１０％熱収縮させて、該容器を熱遮断性包装用フイルムで被覆したときの熱遮断性包装用フイルムの表面温度が、該容器の表面温度より１℃以上低下するA packaging film in which a non-heat-shrinkable film having a thickness of 6 to 50 μm is formed on at least one surface of a heat-shrinkable film having a thickness of 20 to 100 μm via an adhesive layer, wherein the adhesive layer is partially formed instead of the entire surface. A heat-insulating packaging film, which is formed in a uniform manner and satisfies the following conditions.
a) When the heat-insulating packaging film is heat-shrinked, a heat-insulating layer is formed by air on a portion where the adhesive layer between the heat-shrinkable film and the non-heat-shrinkable film is not formed. After covering the container with a film having a surface temperature of 60 ° C. and subjecting the container to heat shrinkage by 10%, the surface temperature of the heat-insulating packaging film when the container is covered with the heat-insulating packaging film is determined by the surface temperature of the container. 1 ℃ lower than temperature
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002169735A JP3678418B2 (en) | 2002-06-11 | 2002-06-11 | Thermal barrier packaging film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002169735A JP3678418B2 (en) | 2002-06-11 | 2002-06-11 | Thermal barrier packaging film |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2004009670A true JP2004009670A (en) | 2004-01-15 |
| JP3678418B2 JP3678418B2 (en) | 2005-08-03 |
Family
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| Application Number | Title | Priority Date | Filing Date |
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| JP2002169735A Expired - Lifetime JP3678418B2 (en) | 2002-06-11 | 2002-06-11 | Thermal barrier packaging film |
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| JP (1) | JP3678418B2 (en) |
Cited By (6)
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| JP2007137468A (en) * | 2005-11-17 | 2007-06-07 | Sadao Hachiman | Insulating adhesive label |
| WO2009054110A1 (en) * | 2007-10-22 | 2009-04-30 | Tokan Kogyo Co., Ltd. | Heat insulated container |
| JP2009178985A (en) * | 2008-01-31 | 2009-08-13 | Yoshino Kogyosho Co Ltd | Labeled synthetic resin molding |
| US8932706B2 (en) | 2005-10-27 | 2015-01-13 | Multi-Color Corporation | Laminate with a heat-activatable expandable layer |
| JP2015044303A (en) * | 2013-08-27 | 2015-03-12 | 凸版印刷株式会社 | Laminate and packaging material and packaging bag using the same |
| JP2016196097A (en) * | 2015-04-02 | 2016-11-24 | 株式会社カクワ | Sheet body |
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| JPS489666U (en) * | 1971-06-16 | 1973-02-02 | ||
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8932706B2 (en) | 2005-10-27 | 2015-01-13 | Multi-Color Corporation | Laminate with a heat-activatable expandable layer |
| JP2007137468A (en) * | 2005-11-17 | 2007-06-07 | Sadao Hachiman | Insulating adhesive label |
| WO2009054110A1 (en) * | 2007-10-22 | 2009-04-30 | Tokan Kogyo Co., Ltd. | Heat insulated container |
| JP4521839B2 (en) * | 2007-10-22 | 2010-08-11 | 東罐興業株式会社 | Insulated container |
| JPWO2009054110A1 (en) * | 2007-10-22 | 2011-03-03 | 東罐興業株式会社 | Insulated container |
| KR101167191B1 (en) | 2007-10-22 | 2012-07-24 | 도칸 고교 가부시키가이샤 | Heat insulated container |
| US8286824B2 (en) | 2007-10-22 | 2012-10-16 | Tokan Kogyo Co., Ltd. | Heat insulated container |
| JP2009178985A (en) * | 2008-01-31 | 2009-08-13 | Yoshino Kogyosho Co Ltd | Labeled synthetic resin molding |
| JP2015044303A (en) * | 2013-08-27 | 2015-03-12 | 凸版印刷株式会社 | Laminate and packaging material and packaging bag using the same |
| JP2016196097A (en) * | 2015-04-02 | 2016-11-24 | 株式会社カクワ | Sheet body |
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| Publication number | Publication date |
|---|---|
| JP3678418B2 (en) | 2005-08-03 |
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