JP5466000B2 - 突き合わせ溶着されたフィルムから形成された包装 - Google Patents

突き合わせ溶着されたフィルムから形成された包装 Download PDF

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JP5466000B2
JP5466000B2 JP2009503722A JP2009503722A JP5466000B2 JP 5466000 B2 JP5466000 B2 JP 5466000B2 JP 2009503722 A JP2009503722 A JP 2009503722A JP 2009503722 A JP2009503722 A JP 2009503722A JP 5466000 B2 JP5466000 B2 JP 5466000B2
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layer
strip
film
packaging
pet
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JP2009503722A
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JP2009532296A5 (ja
JP2009532296A (ja
Inventor
トマス，ジャック
マチュー，ステファン
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エイサパック ホールディング ソシエテ アノニム
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Priority claimed from EP06118170A external-priority patent/EP1884348A1/fr
Priority claimed from EP06118199A external-priority patent/EP1884349A1/fr
Application filed by エイサパック ホールディング ソシエテ アノニム filed Critical エイサパック ホールディング ソシエテ アノニム
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/50—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like
    • B29C65/5042—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like covering both elements to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/44—Joining a heated non plastics element to a plastics element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/50—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/50—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like
    • B29C65/5007—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like characterised by the structure of said adhesive tape, threads or the like
    • B29C65/5021—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like characterised by the structure of said adhesive tape, threads or the like being multi-layered
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/50—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like
    • B29C65/5042—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like covering both elements to be joined
    • B29C65/505—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like covering both elements to be joined and placed in a recess formed in the parts to be joined, e.g. in order to obtain a continuous surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
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    • B29C66/1142—Single butt to butt joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B29C66/432—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms
    • B29C66/4322—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms by joining a single sheet to itself
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/723—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/737—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined
    • B29C66/7371—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined oriented or heat-shrinkable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
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    • B29C66/737—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/737—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined
    • B29C66/7371—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined oriented or heat-shrinkable
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Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wrappers (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Laminated Bodies (AREA)
  • Packages (AREA)
  • Tubes (AREA)
  • Making Paper Articles (AREA)

Description

本発明は、プラスチックフィルムを使用して形成された包装の分野にある。さらに具体的に言うと、端部が突き合わせ溶着されている包装に関する。
本発明はまた、熱可塑性フィルムから生産され、そして端部が突き合わせ溶着されている包装の製造方法に関する。
例えば袋、管あるいはブリックパックを形成する、少なくとも１つのプラスチック層を含有するフィルムから調製された包装は、従来技術において知られている。この包装は、特にフィルムの端部を溶着することによって調製される。
第１の溶着方法は、フィルムの下面がそれ自身に溶着される"裏面と裏面の"接合として公知の接合を生成することにある。この接合は、図１中で具体的に説明される。
第２の溶着方法は、フィルムの端部が重なっており、そして該フィルムの下面が該フィルムの上面に溶着される"裏面と表面の"接合として公知の接合を生成することにある。
この接合は、図２中で具体的に説明される。
"突き合わせ接合"として公知の第３の接合方法は、フィルムの端部を重ねることなく溶着することにある。この方法は、図３中で具体的に説明され、国際公開第２００５/０９５１０５Ａ１号パンフレット、および米国特許第５５６９１４４号明細書、および米国特許第４７３３８００号明細書中に記載される。
一例として、米国特許第４７３３８００号明細書は、多層のプラスチックフィルムから製造され、そして折りたたみ（ｄｅａｄ−ｆｏｌｄ）特性を有する柔軟な管の生産、柔軟なアルミニウム管の特徴である特性を記載する。この特許は、管の内側または外側に溶着され、そして溶着された端部で接合するストリップの使用を提案し、該ストリップは、折りたたみ特性を提供する金属箔を含有する。上記の特許は、ストリップ中の金属箔の厚さが多層フィルム中の金属箔の厚さより厚いことを特定する。この特許の主要な欠点は、調製された管状体の端部のシーリングの困難さに関係する。ペースト状製品（例えば、歯のペースト）用の管を製造するために、管状体の端部に射出成形された管ヘッドを溶着することは普通である。この米国特許第４７３３８００号明細書の教示に従って得られた管状体上への管ヘッドの溶着は、行うのが特に難しい。溶着されたストリップの端部が管状体の内側表面で不連続性を生じ、したがって漏れのリスクを生じる。該ストリップを管の外側に溶着することがまた、この特許に示されている。しかし、アルミニウム層を含有するこの厚さの厚いストリップは、包装の美しさを著しく損なう。
米国特許第５５６９１４４号明細書は、フィルムの端部を突き合わせ溶着するためのデバイスを記載する。ほとんど見えない溶着部を有する得られた管は、改善された美的特性を有する。しかし、溶着部での管の低強度により、これらの管の商業的使用が非常に危くなる。
国際公開第２００５/０９５１０５号パンフレットは、溶着可能でない層を含む多層フィルムの突き合わせ溶着を改善する方法を記載する。この方法は、下面および上面に溶着可能なフィルムを含むラミネート；フィルムの端部から奥まっており、溶着可能なフィルムとの間の閉じ込められた溶着可能でない層の使用にある、それによって、突き合わせ溶着の間に、溶着可能な層が、その端部で溶着可能でない層を取り囲み、そしてその全厚にかけてフィルムの溶着を可能にする。この方法は、多層フィルムの突き合わせ溶着を改善するが、しかし国際公開第２００５/０９５１０５号パンフレットに提案されたこの方法によって生産された多層の管は、溶着部においてフィルムの強度より低い強度を有する。
突き合わせ溶着における主な難しさは、強度がフィルムの強度に近い溶着部を得ることである。特に、引っ張り応力が溶着にかけられた場合に、突き合わせ溶着部で観察される脆い割れ目の態様を克服することが望ましい。
本発明は、少なくとも１つの溶着可能でない層を含む多層フィルムから突き合わせ溶着された包装、フィルムの強度に少なくとも等しい強度、および改善された美的特性を有する本発明により得られた包装を生産することを可能にする。
本発明は、少なくとも、１つの機能性層および１つの溶着可能な層を含む幾つかの層からなるフィルムの突き合わせ溶着で、該機能性層がよくても部分的に溶着されることに関する。溶着部での強度の損失を補うように、フィルムの端部を接合するストリップが加えられ；強度の損失は、該機能性層の端部がよくても部分的に溶着されるか、または溶着可能な層が溶着部で低下した特性を有するという事実に関係する。
本発明の種々の形態は、以下の図およびそれらの詳細な記載からよりよく理解されるであろう：
明細書中で使用される用語の定義：
溶着：同じ性質を有する、または溶融状態で混和性である２種の材料を溶融することによって接合することにある操作、該混和性は、分子鎖の拡散および相互浸透により現れ；次に分子の相互浸透の状態を固定するために、該材料を冷却する。
接着：同じ性質でない、または溶融状態で不混和性である２つの材料を接合する操作。接着は、化学的なメカニズム（鎖末端部の反応、架橋）によって、または物理的メカニズム（ファンデルワールス力、蒸発）によって起こることができる。接着は、室温でまたは材料を加熱することによって、行うことができる接合操作である。
溶着可能な層：主な特徴が溶着によって包装の調製を可能にし、そして促進する層。
機能性層：主な特徴が溶着される能力以外の特性を提供する層。例えば、包装の外観（印刷層、透明層）を改善するため、包装の強度（二軸延伸層、テクニカル層）を改善するため、（酸素、香りに対する）バリアー特性を提供するため、または機能性（包装を開くための引き裂き容易性）を提供するために、薄い厚さを有する機能性層が一般的に使用される。
溶着可能な層は、一般的にポリオレフィン（ポリエチレン、ポリプロピレン）に基づく。突き合わせ溶着は、非常に少量の材料と接触させ、それが強い接合を得ることをさらに難しくする。８０％リニア低密度ポリエチレンと２０％ラジカル低密度ポリエチレンのブレンドからなる溶着可能な層が、強い溶着が得られることを可能にすることが観察された。
機能性層は、広範な樹脂（例えば：ＰＥＴ、ＰＡ、ＰＳ、ＥＶＯＨ、ＰＶＤＣ）に基づいて、その選択は所望の特性に依存する。今日使用される主な機能性層は、バリアー特性（ＳｉＯｘ、ＰＶＤＣ、ＥＶＯＨ、ＰＡ被膜の配置を有するＰＥＴ）を有する一軸または二軸延伸された（ＰＰ、ＰＥＴ、ＰＡ、ＰＳ）層またはフィルムである。機能性層はまた、アルミニウムまたは紙でできていてもよい。
本発明は、溶着部において無視できる厚さの変化を有し、そしてフィルムの強度と等しい溶着部の強度を有する溶着された包装を得ることを可能にする。得られた包装は、溶着部で印刷が途切れることなく、その全表面にかけて印刷できる。
図５は、本発明の好ましい態様を具体的に示す。この好ましい態様は、下表面４として少なくとも１つの溶着可能な層８および上表面３として１つの機能性層７を含むフィルム２の端部５の接合１からなり；該上面３は包装の外側の表面を形成し、そして該下表面４は、包装の内側の表面を形成する。端部５の突き合わせ溶着は、フィルム２の端部の部分的な接合となるが、機能性層７は突き合わせ溶着されない。ストリップ６は、該層の非溶着端部を接合し、そして接合を補強するために、フィルムの上表面３に接着または溶着される。ストリップ６は、多くの場合、ストリップの溶着が一般的に不可能である機能性層３の上に接着される。該ストリップ６は、印刷されているか、または透明であることができ、溶着部におけるバリアー層の起こりうる不連続性を補うために、バリアー層を含むことができる。ストリップ６の厚さは、フィルム２の厚さと比較して薄い。ストリップの厚さは、選択的に１０〜６０μｍである。ストリップは、ラミネートの突き合わせ溶着の前または後に適用できる。包装の内側の表面４を形成する溶着可能な層８は、包装の内側および接合上における衛生特性を保証する。
図５中で具体的に説明された好ましい本発明の態様により調製された包装は、特に好都合かつ革新的である。この本発明の好ましい態様は、第１の層が溶着可能であり、そして第２の層が機能性である２つの層のみを含むフィルム突き合わせ溶着によって、包装を調製可能にする。この方法によって調製された包装は、溶着部での不連続性を有することなく、包装の全表面にかけて印刷できる。ストリップ６は、包装の外観を変化させないために、好ましくは透明であり、そして薄い厚さである。ストリップ６はまた、印刷可能である。
図５中で具体的に説明された好ましい態様は、融点の違いが２０℃より高い層を含むフィルムを突き合わせ接合するために好都合である。
好ましい方法によるこれらのフィルムの接合は、溶着可能な層の融点に近い温度へ該フィルムを加熱すること、および接着されたまたは溶着されたストリップを介して該フィルムの端部を接合することにある。
図６は、第１のストリップ６が包装の外側面に加えられ、そして第２のストリップ１０が包装の内側面に加えられる場合を具体的に示す。
図８に存在する接合は、溶着可能な層８の厚さが薄い場合に好都合である。ストリップ６は、一般的に機能性層７の上面３に接着されるが、一方ストリップ１０は、層８の下面４に有利に溶着され、包装の内側表面を形成する。
図７中で具体的に説明された本発明の変形は、フィルム２の外側の表面を覆う合成樹脂層１１を配置させること；該合成樹脂層ｌｌは、フィルム２の全表面３およびまた、ストリップ６の表面を被覆し、それによってストリップ６が接合１の内側に閉じ込められることにある。図７中で具体的に説明された接合は、溶着部が完全に見えず、そして溶着部において高い強度を有する管状体を調製するのに、特に好都合である。被膜層１６は、選択的にフィルム２の表面上に押し出され、そして該層は、フィルム２およびストリップ６の表面に接着するように選択される。被膜ｌ１は、フィルム２への接着を改善するため、包装のバリアー特性または表面特性を改善するために、いくつかの層を含むことができる。
図８は、発明の選択的な方法によるフィルム突き合わせ溶着による管状体の調製を具体的に示す。溶着可能な第１の層および機能的な第２の層の、２つの層のみを含むフィルムで調製されるので、この管状体は特に好都合である。該フィルムの下面上への上面の溶着が不可能なので、このフィルムは、従来技術により管状体を調製するために使用できない。本発明は、より強くおよびさらに美的な包装を生産することを可能にし、そしてより多様な多層フィルムの使用を可能にする。
上記の様に、包装が改善された美的特性を有するように調製されること；溶着部がほとんど見えないこと、および包装の壁が溶着部において無視できる余分な厚さを有すること、という事実と関係する包装の審美性における改善を可能にするために、フィルムの突き合わせ溶着は、特に好都合である。
本発明は、図５〜８中で具体的に説明された例に限られない。管状体は、図５〜７に示された方法によって生産できる。図５〜７中で具体的に説明された方法の組み合わせから生じる他の方法はまた、均等な使用と同様に、本発明の一部をなす。
本発明はまた、薄い厚さでおよび高い強度の経済的である包装を生産することを可能にする。本発明は、多層のプラスチックフィルム、さらにアルミニウム層、紙またはボール紙層を含むフィルムを接合するために使用できる。
ストリップの厚さは、フィルムの厚さと比較して薄い。一般的に、ストリップの厚さは、フィルムの厚さより５〜１０倍薄い。該ストリップの厚さは、選択的に１０〜６０μｍである。ストリップは、印刷されているか、または透明であることができ；ラミネートの表面に接着または溶着でき；接合のバリアー特性を改善するために、バリアー層を含むことができる。ストリップは、ラミネートの突き合わせ溶着の前または後に適用できる。ストリップは、室温で適用が行われる接着ストリップであることができる、ストリップはフィルムと該ストリップの界面への接着剤の追加によって接着でき、ストリップは該ストリップを加熱することによって接着でき、ストリップは溶着可能である。フィルムの表面上へストリップの接着強度は、接合の強度を決定する１つの因子である。圧力、張力、曲げ、衝撃、または疲労応力が包装にかけられた場合、低すぎる接着強度は、接合の割れ目のリスクとなる。従って、該ストリップが該フィルムから分離できないように、ストリップとフィルムとの間で強い接着を得ることが望ましい。
ストリップは、フィルムの表面上に溶着または接着できる。多くの場合、包装の外側の表面を形成する接合の上表面上のフィルムの上にストリップを接合することが好ましい。多くの接着剤および接着方法は、想定できる。一例として、第１の方法は、接着剤があらかじめ適用された上に、ストリップを加えることにある。この方法の第１の変形は、室温で適用できる接着ストリップであり、第２の変形は、加熱によって接着される接着ストリップである。接着ストリップの使用は、制御するのが容易であり、そして工業レベルまでスケールアップするのが容易である方法を生じる。別の方法は、接合時に接着剤をストリップまたはフィルムに適用することにある。二液性反応性接着剤の使用は、強い接着レベルを得ることを可能にする。一般的に、接着作業は、接合部のなんら特別な表面処理を必要としないが、しかし接着（例えば、コロナ処理）の前に表面処理を行うことができる。
ストリップがフィルムの表面上に接着される場合、管状体の端部の前でストリップを終了させるのが時折好都合である。ストリップは、したがって管状体の長さの一部のみにわたって伸びる。管状体の端部と管の頭部とを接合する場合、多くの場合、ストリップに接合部が無いことが好ましい。
適用の方法および提供される特性により、種々のタイプのストリップがある。
１−ストリップが溶着される：ストリップは、例えば、溶着可能な（共押し出しされた、アモルファス、被覆された）ＰＥＴ、共押し出しされたＯＰＰ、ＰＥ、ＰＰまたは熱封止可能な被膜の層を含む。
２−ストリップは、接着され、そして接着剤によって被覆される。その唯一独特な特徴は、高温または低温のいずれかで使用できる接着剤である接着剤の層を表面上に有することである。接着剤は、ラインにおいて配置されるか、またはストリップ上に存在できる。ストリップは、次にロールの形態で貯蔵され、接着剤は、次にシリコーン紙またはフィルムによって保護される。シリコーンは、任意選択的にストリップの外側の表面の上へ直接配置でき、従ってストリップを置く時に、シリコーンの保護を除去しなければならないことを避けることができる。
紙およびアルミニウムを加えることができる任意のタイプの材料、特に上記１および２に記載された材料を、このストリップに使用できる。次にストリップの定義は、バリアー、機械的耐性および外観特性に関して望まれる特性によって導かれるであろう。
３−ストリップは接着されるが、しかしそれ自身は接着剤で被覆されない。接着剤は、フィルム２の上に配置、またはインライン（ｉｎ−ｌｉｎｅ）で配置できる。使用できる材料は、上記１と同じである。
バリアー特性を提供するために、ストリップは、（ＰＶＯＨ、ＰＶＤＣ、ＳｉＯｘ、ＡｌＯｘまたは金属化被膜または任意の他の市販されているフィルムを有する）アルミニウム層、ＰＥＴもしくはＯＰＰバリアー層、またはＥＶＯＨタイプのバリアーで共押し出しされた層を含むことができる。
そして、一般的に、製品特性の連続性を確かにするために、補強ストリップは、包装に使用されるフィルム２と同じ機能性層、つまりＰＥＴ、ＯＰＰ、ＯＰＡ、バリアーＰＥＴ、金属化ＰＥＴ、バリアーＯＰＰ、金属化ＯＰＰ、アルミニウム紙、ＰＥ、ＰＰ等を含むことができる。
ストリップは、幾つかの層からなることができる。ストリップは、例えば、ＯＰＰ、ＰＥＴ、紙、ＰＥ、ＰＰ、ＯＰＡ、ＰＡ、ＰＥＴ／ＰＥ、ＯＰＰ／ＰＥ、ＯＰＡ／ＰＥ、紙／ＰＥ、ＰＥＴ／Ａｌ、ＯＰＰ／Ａｌ、ＯＰＡ／Ａｌ、ＰＥＴ／Ａｌ／ＰＥ、ＰＥＴ／Ａｌ／ＰＰ、ＯＰＰ／Ａｌ／ＰＥ、ＯＰＰ／Ａｌ／ＰＰ、ＯＰＡ／Ａｌ／ＰＥ、ＯＰＡ／Ａｌ／ＰＰ、紙／Ａｌ／ＰＥ、紙／ＰＥＴ、紙／Ａｌ等でできていることができる。製品の一般的な名前のみを本明細書中に挙げる。この名前は全製品群を網羅する。従ってＰＥＴは、従来の二軸延伸ＰＥＴ、アモルファスＰＥＴ、共押し出しされたＰＥＴ、ＳｉＯｘ ＰＥＴ、ＡｌＯｘ ＰＥＴ、金属化ＰＥＴ等であることができる。ＰＥは、すべてのＰＥをベースとする共押し出しされたフィルムを含み；ＰＥは、とりわけ、ＥＶＯＨまたはＰＡ層を含む。これは、他の例でも同じである。
さらに、１０〜６０μｍの厚さの範囲にある一般的に市販されているすべてのフィルムは、単独でまたは幾つかの層として、これらのストリップ中に存在できる。
本発明は、化粧品、薬品または食品用の柔軟な管を調製するのに特に好都合である。
以下の例において、多層構造は、包装の外面から内面へと、つまり接合の上面から下面へと記載される。本発明の理解を簡素にするために、フィルム２の溶着可能な層および機能性層を接合する接着層は示されていない。ストリップ６または１０とフィルム２との間の接着を提供する接着剤の層のみが特定される。
例１
図５中で具体的に説明された、本発明の選択的な方法によって生産された接合：
ｏ接合１：ＰＥＴ/接着剤−ＰＥＴ/ＰＥ
ｏフィルム２：ＰＥＴ/ＰＥ
ｏ機能性層７：ＰＥＴ−厚さ３０μｍ
ｏ溶着可能な層８：ＰＥ−厚さ１８０μｍ
ｏストリップ６：ＰＥＴ/接着剤厚さ４０μｍ
ｏ接着剤：Ｂｏｓｔｉｋ Ｖｉｔｅｌ１９１２
例２
図５中で具体的に説明された、本発明の選択的な方法によって生産された接合：
ｏ接合１：ＢＯＰＰ/接着剤−ＢＯＰＰ ＰＶＯＨ/ＰＥ
ｏフィルム２：ＢＯＰＰ ＰＶＯＨ/ＰＥ
ｏ機能性層７：ＢＯＰＰ ＰＶＯＨ−厚さ４０μｍ
ｏ溶着可能な層８：ＰＥ−厚さ２００μｍ
ｏストリップ６：ＰＥＴ/接着剤厚さ６０μｍ
ｏ接着剤：Ｂｏｓｔｉｋ ＴＬＨ２０１３
例３
図６中で具体的に説明された、本発明の選択的な方法によって生産された接合：
ｏ接合１：ＰＡ/ＰＥ−ＰＥ/ＰＡ/ＰＥ
ｏフィルム２：ＰＥ/ＰＡ／ＰＥ
ｏ機能性層７：ＰＡ−厚さ４０μｍ
ｏ溶着可能な層８：ＰＥ−厚さ２００μｍ
ｏストリップ６：ＰＡ/ＰＥ−厚さ６０μｍ
例４
図７中で具体的に説明された、本発明の選択的な方法によって生産された接合：
ｏ接合１：ＰＥ/アルミニウム/ＰＥ−ＰＥ
ｏフィルム２：ＰＥ/アルミニウム/ＰＥ
ｏ機能性層７：アルミニウム厚さ８μｍ
ｏ溶着可能な層８：ＰＥ−厚さ８０μｍ
ｏ溶着可能な層９：ＰＥ−厚さ１２０μｍ
ｏストリップ６：ＰＥ−厚さ６０μｍ
例５
図８中で具体的に説明された、本発明の選択的な方法によって生産された接合：
ｏ接合１：ＰＥＴ/接着剤−ＫＲＡＦＴ/アルミニウム/ＰＥ−ＰＥ
ｏフィルム２：ＫＲＡＦＴ/アルミニウム/ＰＥ
ｏ機能性層７：ＫＲＡＦＴ/アルミニウム
ｏ溶着可能な層８：ＰＥＴ−厚さ４０μｍ
ｏストリップ６：ＰＥＴ/接着剤−厚さ６０μｍ
ｏ接着剤：Ｂｏｓｔｉｋ ＴＥＥ２２２
ｏストリップ１０：ＰＥ−厚さ４０μｍ
他の例：
包括的でない方式で、突き合わせ溶着で使用できるいくつかのフィルムを挙げることができる：
ＰＥ ＥＶＯＨ ＰＥ、ＰＥ/Ａｌ/ＰＥ、ＰＥＴ/Ａｌ/ＰＥ、ＰＥＴ/ＰＥ、ＯＰＰ/Ａｌ/ＰＥ、ＯＰＰ/ＰＥ、Ｋｒａｆｔ/ＰＥ、Ｋｒａｆｔ／Ａｌ／ＰＥ
これらと同じ構造が、ＰＥの代わりに溶着可能なＰＰを用いて生産可能である。
製品の一般的な名称のみを本明細書中に挙げた。この名称は、全製品群を網羅する。ＰＥＴは、従って従来の二軸延伸ＰＥＴ、アモルファス５ＰＥＴ、共押し出しされたＰＥＴ、ＳｉＯｘ ＰＥＴ、ＡｌＯｘ ＰＥＴ、金属化ＰＥＴ、等であることができる。ＰＥは、すべてのＰＥベースの共押し出しされたフィルムを含み；ＰＥはとりわけ、ＥＶＯＨまたはＰＡ層を含む。
さらに一般的に、接合が、少なくとも１つの溶着可能なフィルムを含むという前提で、市販されているすべてのフィルムは、突き合わせ溶着可能なフィルム中に存在できる。
図１〜４は、方法フィルムの端部を接合するために、従来技術に記載された主な方法を記載する。
図１は、裏面と裏面の溶着として公知の溶着を具体的に示し、その下面４上で該フィルム２の端部５を接合すること、該下面が包装の内側に位置することにある。 図２は、裏面と表面または重ね合わせ溶着として公知の溶着方法を具体的に示し、フィルム２の端部５を溶着すること；フィルム２の上面３がフィルム２の下面４に接合され；該下面および上面が、それぞれ包装の内側および外側に位置することにある。 図３は、フィルム２の端部５の突き合わせ溶着として、公知の溶着方法を具体的に示す。 図４は、従来技術で公知のタイプの接合を示す。 図５は、フィルム２の端部５の接合１；少なくとも、１つの溶着可能な層８および１つの機能性層７から形成されるフィルム２、該端部５が溶着可能な層８のみにおいて突き合わせ溶着されていること；薄いストリップ６がフィルム２の上面３の上に接着され、そして層７の溶着されていない端部で接合していることからなる本発明の選択的な方法を具体的に示す。 図６は、その端部５で部分的に突き合わせ溶着されるフィルム２の接合、ストリップ６が包装の外側の表面を形成する接合の上面３の上に加えられていること；第２のストリップ１０が、包装の下面４の上に加えられ、そして包装の内側の表面を形成していること；該ストリップ６および１０が部分的に溶着された端部５を接合していることを具体的に示す。 図７は、被膜層ｌｌが、フィルム２およびストリップ６の全表面を覆うために、外側の表面３に加えられることができるという事実を具体的に示す。被膜層ｌｌは、包装の外側の表面を形成し、ストリップ６は、多層構造中に閉じ込められている。 図８は、本発明の選択的な態様による管状体の製品を具体的に示す。

Claims (9)

  1. 端部が突き合わされるように、該端部が置かれた熱可塑性フィルムから生産された包装であって、
    該フィルムは、第１の溶着可能な層および端部の突き合わせ溶着が部分的だけであるかまたは存在しない第２の層を少なくとも含む幾つかの層からなり、そして少なくとも１つの薄いストリップが該フィルムの厚さに比較して薄い厚さを有し、該ストリップが端部を被覆し、そして該第２の層の面の１つに直接取り付けられており、該第１の層と該他の層もしくは他の複数の層との間の融点の違いが２０℃超である、包装。
  2. 該フィルムの該端部に取り付けられ、そして該フィルムの両側上に置かれた２つのストリップを含む、請求項１による包装。
  3. 該ストリップまたは複数のストリップが接着されている、請求項１または２による包装。
  4. 該第２の層および該ストリップが、合成樹脂の層によって覆われている、請求項１〜３のいずれか一項による包装。
  5. フィルムの端部を突き合わせ溶着し、それぞれの層の該端部が直接接触し、該フィルムが第１の溶着可能な層および該端部の該突き合わせ溶着が部分的だけであるかまたは存在しない第２の層を少なくとも含む幾つかの層からなる方法であって、
    該フィルムの該端部が突き合わされて置かれ、次に該第１の層の該端部を溶着するために、連続的に加熱され、そして冷却されること、および少なくとも１つのストリップが該端部を覆うように、該第２の層に取り付けられることを特徴とする、請求項１〜４のいずれか一項に記載された包装の生産方法。
  6. 該ストリップが、該加熱および冷却操作の前に、該第２の層に取り付けられることを特徴とする、請求項５による方法。
  7. 該ストリップが、該加熱および冷却操作の後で、該第２の層に取り付けられることを特徴とする、請求項５による方法。
  8. 該ストリップが、該加熱および冷却操作と同時に、該第２の層に取り付けられることを特徴とする、請求項５による方法。
  9. 少なくとも１つの合成樹脂の層が、該フィルムと該ストリップまたは複数のストリップとで形成された接合部の該表面を覆って配置される、請求項５〜７のいずれか一項による方法。
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EP06118170.7 2006-07-31
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EP06118199A EP1884349A1 (fr) 2006-07-31 2006-07-31 Emballage formé d'un film à plusieurs couches soudé bout à bout
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