JP4211957B2 - Tube body and manufacturing method thereof - Google Patents

Tube body and manufacturing method thereof Download PDF

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Publication number
JP4211957B2
JP4211957B2 JP31629198A JP31629198A JP4211957B2 JP 4211957 B2 JP4211957 B2 JP 4211957B2 JP 31629198 A JP31629198 A JP 31629198A JP 31629198 A JP31629198 A JP 31629198A JP 4211957 B2 JP4211957 B2 JP 4211957B2
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Japan
Prior art keywords
film
surface layer
tube body
laser light
base material
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Expired - Fee Related
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JP31629198A
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Japanese (ja)
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JP2000141469A (en
Inventor
俊哉 ▲よし▼井
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Fuji Seal International Inc
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Fuji Seal International Inc
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Priority to JP31629198A priority Critical patent/JP4211957B2/en
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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
    • 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
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • 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
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1629—Laser beams characterised by the way of heating the interface
    • B29C65/1654—Laser beams characterised by the way of heating the interface scanning at least one of the parts to be joined
    • B29C65/1658—Laser beams characterised by the way of heating the interface scanning at least one of the parts to be joined scanning once, e.g. contour laser welding
    • 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
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1677—Laser beams making use of an absorber or impact modifier
    • 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
    • B29C66/40—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
    • B29C66/40—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
    • B29C66/49—Internally supporting the, e.g. tubular, article during joining
    • 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
    • B29C66/73715—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 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
    • 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
    • B29C66/739—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 material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—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 material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—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 material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • 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
    • B29C2795/00—Printing on articles made from plastics or substances in a plastic state
    • B29C2795/002—Printing on articles made from plastics or substances in a plastic state before shaping
    • 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
    • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/36—Bending and joining, e.g. for making hollow articles
    • B29C53/38—Bending and joining, e.g. for making hollow articles by bending sheets or strips at right angles to the longitudinal axis of the article being formed and joining the edges
    • B29C53/48—Bending and joining, e.g. for making hollow articles by bending sheets or strips at right angles to the longitudinal axis of the article being formed and joining the edges for articles of indefinite length, i.e. bending a strip progressively
    • 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
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1603—Laser beams characterised by the type of electromagnetic radiation
    • B29C65/1612—Infrared [IR] radiation, e.g. by infrared lasers
    • B29C65/1619—Mid infrared radiation [MIR], e.g. by CO or CO2 lasers
    • 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
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1677—Laser beams making use of an absorber or impact modifier
    • B29C65/1683—Laser beams making use of an absorber or impact modifier coated on the article
    • 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
    • B29C66/71—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 composition of the plastics material of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2009/00—Layered products
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/712—Containers; Packaging elements or accessories, Packages
    • B29L2031/7158—Bottles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/744—Labels, badges, e.g. marker sleeves

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Health & Medical Sciences (AREA)
  • Electromagnetism (AREA)
  • Toxicology (AREA)
  • Laminated Bodies (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、飲料や洗剤等の容器に外嵌装着される筒状ラベルに形成されるチューブ体及びその製造方法に関し、特に、両端部同士がレーザー光により接着されてなるチューブ体及びその製造方法に関する。
【０００２】
【従来の技術】
従来、飲料や洗剤等の容器に外嵌装着される筒状ラベルに形成されるチューブ体としては、例えば、自己伸縮性を有するポリエチレン系フィルムの両端部同士がウレタン系接着剤等の接着剤を介して接着されたものが知られていた。
【０００３】
前記チューブ体は、所望の長さに切断されて筒状ラベル（ストレッチラベル）に形成され、該筒状ラベルは、外力を与えることにより拡径して容器に外嵌し、且つ該外力を除くことにより縮径（ほぼ元の形状に復元）させて弾性収縮力により容器等に密着装着して使用される。
【０００４】
しかしながら、上記従来のチューブ体にあっては、接着剤の塗布むらにより両端部の接着強度（以下「センターシール強度」という）が不安定となり、また、ポリエチレン系フィルムの接着剤の密着力を向上させる（接着剤のぬれ性を良くする）ために接着部分にコロナ放電処理を施すことが必要であり、更に、前記ポリエチレン系フィルムを筒状にして両端部同士を接着した後、接着剤を硬化（キュアリング）させるために、２５℃〜４０℃位に保たれたエイジングルームに２４時間〜４８時間位の間チューブ体を静置しなければならなかった。
【０００５】
従って、製造に長時間を要するだけでなく、チューブ体の接着具合の検査を直ぐに行えないので、接着不具合を早期に発見できず、場合によっては、チューブ体を製造し終わった後に接着不具合が発見されて最初から製造し直さなければならない事態も生じていた。
また、エイジングルームの設置場所を確保しなければならないという問題点もあった。
【０００６】
かかる問題点を解決するため、本発明者等は、前記ポリエチレン系フィルムの両端部を、レーザー光の照射によって短時間の間に確実に接着することを検討した。
【０００７】
【発明が解決しようとする課題】
しかしながら、前記ポリエチレン系フィルムの両端部をレーザー光により接着する場合、確実に接着できるレーザー光強度と照射時間により行うと、レーザー光を照射した部分全体が加温されて融解等するため、前記チューブ体の接着部分のフィルム強度が落ちるおそれがあった。
【０００８】
また、チューブ体の接着部分のフィルム強度を落とさずに、且つ十分なセンターシール強度を得るために最適なレーザー光の強さや照射時間を得るためには、接着条件を微調整する必要があり、コントロールしにくかった。
【０００９】
本発明は上記問題点に鑑みてなされたもので、フィルムの重なり合う両端部同士をレーザー光により接着する際に、接着部分のフィルム強度を確保しつつ、安定したセンターシール強度を生産効率よく得ることができるチューブ体及びその製造方法を提供することを課題とする。
【００１０】
【課題を解決するための手段】
本発明は上記課題を解決するためになされたものであり、請求項１記載の発明は、印刷が施された合成樹脂製のフィルム３の両端部３ａ，３ｂを重ね合わせてレーザー光の照射によって接着することにより筒状に形成され、所望の長さに切断されることにより、容器に外嵌装着される筒状ラベルに形成されるチューブ体において、前記フィルム３は、基材１と、該基材１の両面側に積層された表面層２とを備え、該表面層２は、前記基材１よりも融点の低い材料からなり、フィルム３の一面側にはその一方の端部３ａを除いて印刷層４が設けられて該一方の端部３ａにおいて表面層２が露出し、該印刷層４が内面側となるようにフィルム３が筒状に形成され且つ前記一方の端部３ａが外側になるようにして両端部３ａ，３ｂが重ね合わせられてその表面層２同士がレーザー光により接着されていることを特徴とする。
【００１１】
請求項１記載の発明にあっては、筒状に形成して重なり合う両端部３ａ，３ｂ同士がレーザー光の照射により接着される際、前記両端部３ａ，３ｂの表面層２同士が軟化又は融解により接着されてなる。
【００１２】
この場合において、前記表面層２は、基材１よりも融点の低い材料からなるため、フィルム３がレーザー光の照射により加温された場合、基材１は融点に達しない状態で表面層２が軟化又は融解して該表面層２同士が接着されることとなる。
【００１３】
かかるチューブ体の製造方法は、請求項４の如く、所望の長さに切断されることにより、容器に外嵌装着される筒状ラベルに形成されるチューブ体の製造方法であって、印刷を施した合成樹脂製の長尺状のフィルム３を繰り出しながらフォーマー６に導き該フォーマー６でフィルム３を筒状に形成しながらその両端部３ａ，３ｂを重ね合わせてその外面側からレーザー光を照射して順次接着することによりチューブ体を連続的に形成するチューブ体の製造方法において、基材１の両面側に該基材１よりも融点の低い材料からなる表面層２を積層して前記フィルム３を構成し、該フィルム３の一面側にその一方の端部３ａを除いて印刷層４を形成して該一方の端部３ａにおいて表面層２が露出した状態とし、該フィルム３を印刷層４が内面側となるように筒状に形成し且つ前記一方の端部３ａが外側になるようにして両端部３ａ，３ｂを重ね合わせ、その表面層２同士をレーザー光により接着することを特徴とする。
【００１４】
請求項４記載の発明にあっては、フィルム３の両端部３ａ，３ｂをレーザー光により接着する際、両端部３ａ，３ｂの表面層２同士を軟化又は融解させて接着することとなる。
【００１５】
このとき、表面層２は、基材１よりも融点が低い材料からなるため、レーザー光の照射によりフィルム３を加温した場合、基材１が融点に達しない状態で表面層２を軟化又は融解させて該表面層２同士を接着できる。
【００１６】
また、請求項２記載の発明は、印刷が施された合成樹脂製のフィルム３の両端部３ａ，３ｂを重ね合わせてレーザー光の照射によって接着することにより筒状に形成され、所望の長さに切断されることにより、容器に外嵌装着される筒状ラベルに形成されるチューブ体において、前記フィルム３は、基材１と、該基材１の両面側に積層された表面層２とを備え、該表面層２は、前記基材１よりもレーザー光の吸収性の良い材料からなり、フィルム３の一面側にはその一方の端部３ａを除いて印刷層４が設けられて該一方の端部３ａにおいて表面層２が露出し、該印刷層４が内面側となるようにフィルム３が筒状に形成され且つ前記一方の端部３ａが外側になるようにして両端部３ａ，３ｂが重ね合わせられてその表面層２同士がレーザー光により接着されていることを特徴とする。
【００１７】
請求項２記載の発明にあっては、筒状に形成して重なり合う両端部３ａ，３ｂ同士がレーザー光の照射により接着される際、前記両端部３ａ，３ｂの表面層２同士が軟化又は融解により接着されてなる。
【００１８】
この場合において、前記表面層２は、基材１よりもレーザー光の吸収性の良い材料からなるため、レーザー光の照射により基材１よりも表面層２が効率良く加熱されて早く昇温し、基材１が融解するに至らない状態で表面層２が互いに接着可能な程度に軟化又は融解する温度（以下「接着温度」という）に達し、該表面層２同士が接着されてなる。
【００１９】
特に、請求項３の如く、前記表面層２が、前記基材１よりもレーザー光の吸収性が良く、且つ融点の低い材料からなれば、より一層表面層２が接着温度に達しやすい。
【００２０】
かかるチューブ体の製造方法は、請求項５の如く、所望の長さに切断されることにより、容器に外嵌装着される筒状ラベルに形成されるチューブ体の製造方法であって、印刷を施した合成樹脂製の長尺状のフィルム３を繰り出しながらフォーマー６に導き該フォーマー６でフィルム３を筒状に形成しながらその両端部３ａ，３ｂを重ね合わせてその外面側からレーザー光を照射して順次接着することによりチューブ体を連続的に形成するチューブ体の製造方法において、基材１の両面側に該基材１よりもレーザー光の吸収性の良い材料からなる表面層２を積層して前記フィルム３を構成し、該フィルム３の一面側にその一方の端部３ａを除いて印刷層４を形成して該一方の端部３ａにおいて表面層２が露出した状態とし、該フィルム３を印刷層４が内面側となるように筒状に形成し且つ前記一方の端部３ａが外側になるようにして両端部３ａ，３ｂを重ね合わせ、その表面層２同士をレーザー光により接着することを特徴とする。
【００２１】
請求項５記載の発明にあっては、フィルム３の両端部３ａ，３ｂをレーザー光により接着する際、両端部３ａ，３ｂの表面層２同士を軟化又は融解させて接着することとなる。
【００２２】
このとき、表面層２は、基材１よりもレーザー光の吸収性の良い材料からなるため、レーザー光の照射により基材１よりも表面層２を効率良く加熱して早く昇温させ、基材１が融解するに至らない状態で表面層２を接着温度に達しせしめ、該表面層２同士を接着できる。
【００２３】
特に、重ね合わせた両端部３ａ，３ｂの外面側からレーザー光を照射して両端部３ａ，３ｂ同士を接着するので、前記両端部３ａ，３ｂの互いに向かい合って接触する各表面層２を効率良く接着温度まで昇温させることができるため、フィルム３の前記端部３ａにダメージを与えることを防止しつつ、確実に接着できる。
【００２４】
【発明の実施の形態】
以下、本発明のチューブ体の第一実施形態について、図面を参酌しつつ説明する。
【００２５】
第一実施形態のチューブ体は、図１及び図２に示すように、基材１と、該基材１の両面側に積層された厚さ２〜１０μｍの表面層２を備えてなる自己伸縮性を有するポリエチレン系のフィルム３が、筒状に形成され、重なり合う両端部３ａ，３ｂ同士がレーザー光の照射により接着されてなる。
【００２６】
前記フィルム３の一面側においては、商品名や説明書等の印刷層４が一方の端部３ａの無印刷部４ａを除いて設けられ、該無印刷部４ａは前記表面層２が露出してなる。
【００２７】
また、前記フィルム３の他面側においては、印刷が施されることなく前記表面層２が露出してなり、前記フィルム３を、前記印刷層４が内面側となるよう筒状に形成して前記一方の端部３ａが外側になるよう他方の端部３ｂと重ね合わせた際に、該端部３ｂの前記無印刷部４ａと接触する部分が、無印刷部４ｂとなるよう構成されている。
【００２８】
前記基材１は、融点１２５℃の低密度ポリエチレンからなり、また、前記表面層２は、融点１０２℃のメタロセン系触媒を用いて重合した直鎖状低密度ポリエチレン（以下「メタロセン系ポリエチレン」という）からなる。尚、融点は、示差型熱量計により測定し、昇温時のピーク温度とする（ＪＩＳ Ｋ７１２２に準じて測定）。
【００２９】
上記構成からなるフィルム３は、図３に示すように、前記印刷層４が内面側になるよう筒状に形成され、且つ前記無印刷部４ａを有する端部３ａが外側になり、表面層２（無印刷部４ａ，４ｂ）同士が接触するよう両端部３ａ，３ｂが重ね合わされ、該表面層２（無印刷部４ａ，４ｂ）同士が炭酸ガスレーザー光の照射によって軟化又は融解することにより接着され、チューブ体に形成されてなる。
【００３０】
次に、上記構成からなる第一実施形態のチューブ体の製造方法について説明する。
第一実施形態のチューブ体に形成されるフィルム３は、前記基材１の低密度ポリエチレンと、前記表面層２のメタロセン系ポリエチレンとを別々の押出機により溶融状態で導き一つの口金より押し出して積層する共押出法により製造される。このような共押出法によってフィルム３が形成された場合には、各層同士が溶融状態時に接着されてなるため、各層の特徴が失われない。
【００３１】
また、前記印刷層４は、グラビア印刷法等の公知の方法により設けられる。
【００３２】
その後、図４に示すように、所定の幅にスリットした長尺状のフィルム３をフォーマー６に導き、連続的に繰り出されるフィルム３はフォーマー６及び曲げ用治具（図示省略）により前記印刷層４が内側になるよう筒状に折り込まれる。この筒状に折り込まれたフィルム３の両端部３ａ，３ｂはフォーマー６の中心上部で端部３ａが外側となるよう重ね合わされ、無印刷部４ａ，４ｂ（表面層２同士）が接触した状態で、その重ね合わせ部の外面側の上部から炭酸ガスレーザー照射装置７によりレーザー光が照射され、両端部３ａ，３ｂが順次接着され、チューブ体に形成される。
【００３３】
このとき、本実施形態のチューブ体に形成されるフィルム３は、基材１の両面側に設けられた表面層２が基材１よりも低融点の材料からなるため、フィルム３にレーザー光が照射された場合、基材１よりも表面層２が先に融点に達する。従って、基材１が軟化又は融解によるダメージを受けにくい状態で両端部３ａ，３ｂ同士が接着されることとなり、接着部分のフィルム強度を確保できる。
【００３４】
特に、フィルム３を筒状に形成して両端部３ａ，３ｂ重ね合わせた際に外側となる端部３ａの外面側からレーザー光を照射した場合であっても、融点の低い表面層２を基材１よりも先に軟化又は融解し、基材１が軟化又は融解によるダメージを受けにくい状態で接着することができるため、該端部３ａにダメージを与えることを防止しつつ、確実に接着できる。
【００３５】
即ち、表面層２を確実に融解して強いセンターシール強度を得るために比較的強いレーザー光により接着してもフィルム３を切断することがないため、レーザー光による接着処理条件の設定幅が広くなる結果、コントロールしやすく、安定したセンターシール強度を生産効率よく得ることができる。
【００３６】
上記方法で製造されたチューブ体は、その後、図５に示すように、適宜所定の寸法に裁断されて筒状ラベル（ストレッチラベル）８に形成され、拡径して容器９に外嵌され、自己収縮性により容器９に密着装着される。
【００３７】
このとき、本実施形態のチューブ体から形成された筒状ラベル８は、フィルムの両端部３ａ，３ｂの表面層２同士が確実に接着され、強いセンターシール強度を有するため、接着部分が剥離するおそれはない。
【００３８】
尚、前記基材１及び表面層２を形成するポリエチレン系樹脂は、前記低密度ポリエチレン及びメタロセン系ポリエチレンの他、直鎖状低密度ポリエチレン、エチレン−酢酸ビニル共重合体、エチレン−エチルアクリレート共重合体、アイオノマー等が例示される。
【００３９】
また、前記基材１と表面層２との融点の差は、大きいほど好ましいが、２〜３０℃の差があれば、上記効果が得られる。
【００４０】
次に、本発明の第二実施形態について説明する。尚、図面及び符号は上記第一実施形態と共通である。
【００４１】
第二実施形態のチューブ体に形成されるフィルム３は、図１に示すように、ポリエチレン系樹脂からなり自己伸縮性を有する基材１と表面層２とを備え、該表面層２は、基材１よりもレーザー光のエネルギーを吸収しやすい、即ち、レーザー光の照射によって効率良く発熱する樹脂からなる。
【００４２】
前記基材１は、直鎖状低密度ポリエチレンからなり、前記表面層２は酢酸ビニルを３〜１０％含有するエチレン−酢酸ビニル共重合体からなる。前記表面層２のエチレン−酢酸ビニル共重合体は、前記基材１の直鎖状低密度ポリエチレンに比して炭酸ガスレーザー光の吸収性が良く、且つ融点が低い材料である。
【００４３】
尚、前記基材１及び表面層２の材料以外の構成については上記第一実施形態と同様である。
【００４４】
次に、上記構成からなる第二実施形態のチューブ体の製造方法について説明する。
第二実施形態のチューブ体に形成されるフィルム３は、前記基材１を構成する直鎖状低密度ポリエチレンと、表面層２を構成するエチレン−酢酸ビニル共重合体とを別々の押出機により溶融状態で導き一つの口金より押し出して積層する共押出法により製造される。このような共押出法によってフィルム３が形成された場合には、各層同士が溶融状態時に接着されてなるため、各層の特徴が失われない。
【００４５】
その後、前記フィルム３は、図４に示すように、上記第一実施形態と同様の方法でチューブ体に形成される。
【００４６】
第二実施形態のチューブ体に形成されるフィルム３は、基材１の両面側に設けられた表面層２が、基材１よりもレーザー光の吸収性の良い材料からなるため、両端部３ａ，３ｂの表面層２（無印刷部４ａ，４ｂ）同士が炭酸ガスレーザーの照射によって接着される際、表面層２が基材１よりも効率良く加熱され、基材１が軟化又は融解によるダメージが少ない状態で該表面層２が接着温度に達して接着される結果、接着部分のフィルム強度を確保できる。
【００４７】
しかも、表面層２が基材１よりも融点が低い材料からなるため、より一層表面層２が接着温度に達しやすく、接着部分のフィルム強度を確保しつつ、より一層効率的に接着できる。
【００４８】
特に、フィルム３を筒状に形成して両端部３ａ，３ｂ重ね合わせた際に外側となる端部３ａの外面側からレーザー光を照射した場合であっても、表面層２を基材１よりも早く昇温させて軟化又は融解させることができるため、該端部３ａにダメージを与えることを防止しつつ、確実に接着できる。
【００４９】
即ち、表面層２がレーザー光の吸収性が良いため比較的弱いレーザー光でも加熱することができ、且つ基材１が表面層２に比してレーザー光を吸収しにくい（ダメージが少ない）ため比較的強いレーザー光を照射しても融解や切断せず、結果、レーザー光による接着処理条件の設定幅が広くなり、コントロールしやすく、安定したセンターシール強度を生産効率良く得ることができる。
【００５０】
尚、基材１が低密度ポリエチレンからなり、且つ表面層２が前記低密度ポリエチレンよりもレーザー光の吸収性が良いアイオノマーからなってもよい。要は、表面層２が基材１よりもレーザー光の吸収性の良い材料からなればよい。但し、上記第二実施形態の如く、表面層２が基材１よりもレーザー光の吸収性が良く、且つ融点が低い材料からなれば、より一層表面層２を効率良く接着温度まで昇温させることができるため、好ましい。
【００５１】
また、上記第二実施形態では、表面層２が基材１よりもレーザー光のエネルギーを吸収しやすい材料からなったが、表面層２にレーザー光のエネルギーを吸収する物質が添加されてなってもよい。例えば、粒径０．１〜５μｍのシリカ微粉末を０．１〜２重量％、その他にカオリン、珪藻土、エポキシ樹脂やポリメチルメタアクリレート等の微粒子等を０．１〜２重量％添加してもよい。要は、基材１よりも表面層２の方がレーザー光のエネルギーを吸収しやすく構成されていればよい。例えば、基材１が、低密度ポリエチレンからなり、表面層２がメタロセン系触媒を用いて重合された低密度ポリエチレンにレーザー光吸収剤を添加したものであってもよい。
【００５２】
尚、本発明は、上記各実施形態の構成に限定されず、本発明の意図する範囲内で適宜設計変更可能である。
【００５３】
即ち、基材１及び表面層２を構成する樹脂は、上記ポリエチレン系樹脂に限定されず、ポリプロピレン系のものも採用可能である。
【００５４】
また、上記第一及び第二実施形態では、チューブ体を形成するフィルム３としてストレッチフィルム（自己伸縮性フィルム）３を用いた筒状ラベル（ストレッチラベル）８とする場合について説明したが、該フィルムとして熱収縮性フィルムを用いて筒状のシュリンクラベルとする場合にも採用可能である。
【００５５】
更に、前記基材１及び表面層２を形成する樹脂には、適宜公知の添加剤、例えば、安定剤、抗酸化剤、滑剤及び抗ブロッキング剤等を添加することができる。
【００５６】
また、前記各層（基材１、表面層２及び印刷層４）の厚さは、特に限定されるものではない。
【００５７】
更に、上記第一及び第二実施形態では、基材１と、該基材１の両面側の表面層２との三層構造からなるフィルム３を共押出法によって形成したものを示したが、フィルム３の製造方法はこれに限定されるものではなく、それぞれ、別個に作成された各層の単層フィルムを貼り合わせるドライラミネート方法や前記基材１の両面側に表面層２を溶融押し出しする押出ラミネート方法等の公知の技術で製造することができる。
【００５８】
また、上記第一及び第二実施形態では、印刷層４がフィルム３の一面側にのみ設けられてなったが、印刷層４は、他面側にも設けられてなってもよい。本実施形態による場合は、他面側に設けられる印刷層４は、端部３ｂの無印刷部４ｂを除いて設けられてなる。要は、フィルム３が筒状に形成された際に、無印刷部４ａ，４ｂ同士が接触して表面層２同士が接着されるよう構成されてなればよい。
【００５９】
更に、レーザー光の種類は、大容量を得やすい炭酸ガスレーザー光が好ましいが、必ずしも限定されるものではない。
【００６０】
【発明の効果】
以上のように、請求項１記載のチューブ体は、フィルムの表面層が基材よりも融点の低い材料からなるため、筒状に形成して重なり合う両端部がレーザー光によって接着される場合に、基材の軟化や融解によるダメージが少ない状態で表面層が軟化又は融解して接着されてなるため、フィルム強度が確保され、且つ十分なセンターシール強度を得るためのレーザー光の強度及び照射時間等の条件の幅が広いため、コントロールしやすく、結果、安定したセンターシール強度を生産効率良く得ることができる。
【００６１】
また、請求項２記載のチューブ体にあっては、フィルムの表面層が基材よりもレーザー光の吸収性の良い材料からなるため、筒状に形成して重なり合う両端部がレーザー光によって接着される場合に、基材の軟化や融解によるダメージが少ない状態で表面層が接着温度に達して接着されてなるため、フィルム強度が確保され、且つ十分なセンターシール強度を得るためのレーザー光の強度及び照射時間等の条件の幅が広いため、安定したセンターシール強度を生産効率良く得ることができる。
【００６２】
特に、請求項３の如く、表面層が、基材よりもレーザー光の吸収性が良く、且つ融点の低い材料からなれば、レーザー光の照射によって表面層がより一層早く接着温度に達するため、より一層安定したセンターシール強度を生産効率良く得ることができる。
【００６３】
また、本請求項４記載のチューブ体の製造方法によれば、フィルムの両端部をレーザー光により接着する際、基材の軟化又は融解によるダメージが少ない状態で表面層を軟化又は融解させて接着することができるため、接着部分のフィルム強度を確保しつつ、安定したセンターシール強度を有するチューブ体を効率良く製造することができる。
【００６４】
更に、本請求項５記載のチューブ体の製造方法によれば、フィルムの両端部をレーザー光により接着する際、表面層を基材よりも効率良く加熱して、基材の軟化又は融解によるダメージが少ない状態で接着することができるため、接着部分のフィルム強度を確保しつつ、安定したセンターシール強度を有するチューブ体を効率よく製造することができる。
【００６５】
特に、重ね合わせた両端部の外面側からレーザー光を照射するので、基材のダメージが少ない状態で互いに接着される表面層を早く接着温度まで昇温させることができるため、フィルムにダメージを与えることを防止しつつ、確実に接着できる。
【図面の簡単な説明】
【図１】本発明の第一及び第二実施形態を示す一部省略断面図。
【図２】同各実施形態の使用状態を示す斜視図。
【図３】図２のＰ−Ｐ線断面図。
【図４】本発明の第一及び第二実施形態の製造状態を示す斜視図。
【図５】同各実施形態の使用状態を示す斜視図。
【符号の説明】
１・・・基材
２・・・表面層
３・・・フィルム
３ａ，３ｂ・・・両端部
４ａ，４ｂ・・・無印刷部[0001]
BACKGROUND OF THE INVENTION
TECHNICAL FIELD The present invention relates to a tube body formed on a cylindrical label that is externally fitted to a container such as a beverage or a detergent, and a manufacturing method thereof, and in particular, a tube body in which both ends are bonded to each other by laser light and a manufacturing method thereof. About.
[0002]
[Prior art]
Conventionally, as a tube body formed on a cylindrical label that is externally fitted to a container such as a beverage or a detergent, for example, both ends of a polyethylene film having self-stretchability are made of an adhesive such as a urethane adhesive. What was glued through was known.
[0003]
The tube body is cut into a desired length and formed into a cylindrical label (stretch label). The cylindrical label is expanded in diameter by applying an external force and is externally fitted to the container, and the external force is removed. Thus, the diameter is reduced (substantially restored to the original shape) and is attached to a container or the like by an elastic contraction force.
[0004]
However, in the conventional tube body, the adhesive strength at both ends (hereinafter referred to as “center seal strength”) becomes unstable due to uneven application of the adhesive, and the adhesive strength of the polyethylene film adhesive is improved. It is necessary to apply corona discharge treatment to the bonded part in order to improve the wettability of the adhesive. Furthermore, after the polyethylene film is made into a cylindrical shape and bonded at both ends, the adhesive is cured. In order to cure (cure), the tube body had to be left in an aging room maintained at about 25 ° C. to 40 ° C. for about 24 hours to 48 hours.
[0005]
Therefore, not only does it take a long time to manufacture, but also it is not possible to immediately inspect the bonding condition of the tube body, so it is not possible to find bonding problems early, and in some cases, bonding defects are discovered after the tube body has been manufactured. There was also a situation that had to be remanufactured from the beginning.
In addition, there is a problem that it is necessary to secure a place for installing the aging room.
[0006]
In order to solve such a problem, the present inventors studied to securely bond both end portions of the polyethylene-based film within a short time by laser light irradiation.
[0007]
[Problems to be solved by the invention]
However, when both ends of the polyethylene film are bonded with laser light, the entire portion irradiated with the laser light is heated and melted when the laser light intensity and irradiation time can be reliably bonded. There was a possibility that the film strength of the adhesion part of the body might fall.
[0008]
In addition, in order to obtain the optimum laser beam strength and irradiation time in order to obtain a sufficient center seal strength without reducing the film strength of the bonded portion of the tube body, it is necessary to finely adjust the bonding conditions, It was hard to control.
[0009]
The present invention has been made in view of the above problems, and when a film is bonded to each other by overlapping laser beams, a stable center seal strength can be obtained with high production efficiency while ensuring the film strength of the bonded portion. It is an object of the present invention to provide a tube body that can be manufactured and a method for manufacturing the same.
[0010]
[Means for Solving the Problems]
The present invention has been made to solve the above-mentioned problems, and the invention according to claim 1 is characterized in that both ends 3a and 3b of a synthetic resin film 3 on which printing has been performed are overlapped and irradiated with laser light. In the tube body formed in the cylindrical label that is formed into a cylindrical shape by bonding and cut into a desired length, and is externally attached to the container, the film 3 includes the substrate 1 and the A surface layer 2 laminated on both sides of the substrate 1, and the surface layer 2 is made of a material having a melting point lower than that of the substrate 1 , and one end 3 a is provided on one surface side of the film 3. Except for the printing layer 4, the surface layer 2 is exposed at the one end 3a, the film 3 is formed in a cylindrical shape so that the printing layer 4 is on the inner surface side, and the one end 3a is Both ends 3a and 3b are overlapped so as to be outside The surface layer 2 with each other, characterized in that it is bonded by a laser beam.
[0011]
In the first aspect of the invention, when the two end portions 3a and 3b that are formed and overlapped with each other are bonded together by laser light irradiation, the surface layers 2 of the both end portions 3a and 3b are softened or melted. It is adhered by.
[0012]
In this case, since the surface layer 2 is made of a material having a melting point lower than that of the substrate 1, when the film 3 is heated by laser light irradiation, the substrate 1 does not reach the melting point. Is softened or melted and the surface layers 2 are bonded to each other.
[0013]
The manufacturing method of such a tube body is a manufacturing method of a tube body formed on a cylindrical label that is externally attached to a container by being cut to a desired length as in claim 4. subjecting the synthetic resin of the elongated film 3 in the former 6 led to former 6 while feeding the film 3 is formed in a cylindrical shape both ends 3a of Nagaraso, the laser beam from the outer surface side by superposing 3b In the method of manufacturing a tube body in which a tube body is continuously formed by sequentially irradiating and bonding, a surface layer 2 made of a material having a melting point lower than that of the base material 1 is laminated on both sides of the base material 1 A film 3 is formed, and a printed layer 4 is formed on one surface side of the film 3 except for one end 3a thereof so that the surface layer 2 is exposed at the one end 3a, and the film 3 is printed. Layer 4 is on the inner side Formed and the the cylindrical shape so that one end portion 3a is superposed end portions 3a, and 3b so as to be outwardly, characterized by bonding the laser beam and the surface layer 2 to each other.
[0014]
In the invention according to claim 4, when the both ends 3a, 3b of the film 3 are bonded by laser light, the surface layers 2 of the both ends 3a, 3b are softened or melted to be bonded.
[0015]
At this time, since the surface layer 2 is made of a material having a melting point lower than that of the substrate 1, when the film 3 is heated by laser light irradiation, the surface layer 2 is softened in a state where the substrate 1 does not reach the melting point. The surface layers 2 can be bonded together by melting.
[0016]
The invention described in claim 2 is formed in a cylindrical shape by overlapping both ends 3a, 3b of a printed synthetic resin film 3 and bonding them by laser light irradiation, and has a desired length. In the tube body formed on the cylindrical label that is externally fitted to the container, the film 3 includes a base material 1 and a surface layer 2 laminated on both sides of the base material 1. The surface layer 2 is made of a material having better laser light absorption than the substrate 1, and a printed layer 4 is provided on one side of the film 3 except for one end 3a. The surface layer 2 is exposed at one end portion 3a, the film 3 is formed in a cylindrical shape so that the printed layer 4 is on the inner surface side, and the both end portions 3a, 3b are superposed and the surface layers 2 become laser beams. Characterized in that it is bonded Ri.
[0017]
In the invention according to claim 2, when the two end portions 3a and 3b which are formed in a cylindrical shape and are overlapped with each other are bonded by laser light irradiation, the surface layers 2 of the both end portions 3a and 3b are softened or melted. It is adhered by.
[0018]
In this case, since the surface layer 2 is made of a material having better laser light absorbability than the base material 1, the surface layer 2 is heated more efficiently than the base material 1 by the irradiation of the laser light, and the temperature rises quickly. The temperature reaches a temperature at which the surface layers 2 are softened or melted to the extent that they can be bonded to each other in a state where the base material 1 does not melt (hereinafter referred to as “adhesion temperature”), and the surface layers 2 are bonded to each other.
[0019]
In particular, as in claim 3, if the surface layer 2 is made of a material having better laser light absorbability and a lower melting point than the base material 1, the surface layer 2 is more likely to reach the bonding temperature.
[0020]
The manufacturing method of such a tube body is a manufacturing method of a tube body formed on a cylindrical label that is externally attached to a container by being cut to a desired length, as in claim 5. subjecting the synthetic resin of the elongated film 3 in the former 6 led to former 6 while feeding the film 3 is formed in a cylindrical shape both ends 3a of Nagaraso, the laser beam from the outer surface side by superposing 3b In the manufacturing method of a tube body in which a tube body is continuously formed by sequentially irradiating and adhering, a surface layer 2 made of a material having better laser light absorptivity than the substrate 1 is provided on both sides of the substrate 1. The film 3 is laminated to form a printed layer 4 on one surface side of the film 3 except for one end 3a thereof, and the surface layer 2 is exposed at the one end 3a. Print film 3 4 characterized in that the superimposed end portions 3a, and 3b as cylindrical shape formed and the one end portion 3a so that the inner surface side is on the outside, to adhere by laser light and the surface layer 2 to each other And
[0021]
In the invention of claim 5, when the both ends 3a, 3b of the film 3 are bonded by laser light, the surface layers 2 of the both ends 3a, 3b are softened or melted to bond.
[0022]
At this time, since the surface layer 2 is made of a material having better laser light absorption than the base material 1, the surface layer 2 is heated more efficiently than the base material 1 by irradiation with the laser light to quickly raise the temperature. The surface layer 2 can reach the bonding temperature in a state where the material 1 does not melt, and the surface layers 2 can be bonded to each other.
[0023]
In particular, superimposed end portions 3a, 3 b from the outer surface side by irradiating laser beam at both ends 3a, since bonding the 3b together, said end portions 3a, efficiency of each surface layer 2 in contact opposite to each other of 3b Since the temperature can be well raised to the bonding temperature, the film 3 can be securely bonded while preventing the end 3a of the film 3 from being damaged.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a first embodiment of a tube body of the present invention will be described with reference to the drawings.
[0025]
As shown in FIGS. 1 and 2, the tube body according to the first embodiment includes a base material 1 and a surface layer 2 having a thickness of 2 to 10 μm laminated on both sides of the base material 1. A polyethylene-based film 3 having a property is formed in a cylindrical shape, and the overlapping end portions 3a and 3b are bonded to each other by laser light irradiation.
[0026]
On one side of the film 3, a printing layer 4 such as a trade name or an instruction is provided except for the non-printing portion 4 a of one end 3 a, and the surface layer 2 is exposed in the non-printing portion 4 a. Become.
[0027]
Further, on the other surface side of the film 3, the surface layer 2 is exposed without printing, and the film 3 is formed in a cylindrical shape so that the printing layer 4 is on the inner surface side. When the one end portion 3a is overlapped with the other end portion 3b so that the one end portion 3a is on the outside, the portion of the end portion 3b that contacts the non-printing portion 4a is configured to be a non-printing portion 4b. .
[0028]
The substrate 1 is made of low density polyethylene having a melting point of 125 ° C., and the surface layer 2 is a linear low density polyethylene (hereinafter referred to as “metallocene polyethylene”) polymerized using a metallocene catalyst having a melting point of 102 ° C. ). The melting point is measured with a differential calorimeter, and the peak temperature at the time of temperature rise is measured (measured according to JIS K7122).
[0029]
As shown in FIG. 3, the film 3 having the above structure is formed in a cylindrical shape so that the printing layer 4 is on the inner surface side, and the end 3a having the non-printing portion 4a is on the outer side, and the surface layer 2 The two end portions 3a and 3b are overlapped so that the (non-printing portions 4a and 4b) are in contact with each other, and the surface layers 2 (non-printing portions 4a and 4b) are bonded together by being softened or melted by irradiation with carbon dioxide laser light. And formed into a tube body.
[0030]
Next, the manufacturing method of the tube body of 1st embodiment which consists of the said structure is demonstrated.
The film 3 formed on the tube body of the first embodiment is obtained by guiding the low density polyethylene of the base material 1 and the metallocene polyethylene of the surface layer 2 in a molten state by separate extruders and extruding from a single die. Manufactured by a coextrusion method of lamination. When the film 3 is formed by such a coextrusion method, the layers are bonded to each other in the molten state, so that the characteristics of the layers are not lost.
[0031]
The printing layer 4 is provided by a known method such as a gravure printing method.
[0032]
After that, as shown in FIG. 4, a long film 3 slit to a predetermined width is guided to a former 6, and the film 3 continuously fed out is printed on the printed layer by the former 6 and a bending jig (not shown). Folded into a cylinder so that 4 is on the inside. The both ends 3a and 3b of the film 3 folded into a cylindrical shape are overlapped so that the end 3a is on the outer side at the center upper portion of the former 6, and the non-printed portions 4a and 4b (surface layers 2) are in contact with each other. The laser beam is irradiated from the upper part on the outer surface side of the overlapping portion by the carbon dioxide laser irradiation device 7, and both end portions 3a and 3b are sequentially bonded to form a tube body.
[0033]
At this time, since the film 3 formed on the tube body of the present embodiment is made of a material having a melting point lower than that of the substrate 1 because the surface layer 2 provided on both sides of the substrate 1 is made of laser light on the film 3. When irradiated, the surface layer 2 reaches the melting point earlier than the substrate 1. Therefore, both ends 3a and 3b are bonded together in a state where the substrate 1 is not easily damaged by softening or melting, and the film strength of the bonded portion can be ensured.
[0034]
In particular, when the film 3 is formed in a cylindrical shape and both end portions 3a and 3b are overlapped, the surface layer 2 having a low melting point is used even when laser light is irradiated from the outer surface side of the outer end portion 3a. Since the material 1 is softened or melted before the material 1 and the base material 1 can be bonded in a state that is not easily damaged by the softening or melting, the material can be securely bonded while preventing the end portion 3a from being damaged. .
[0035]
That is, the film 3 is not cut even if it is bonded with a relatively strong laser beam in order to surely melt the surface layer 2 and obtain a strong center seal strength. As a result, it is easy to control and a stable center seal strength can be obtained with high production efficiency.
[0036]
After that, the tube body manufactured by the above method is appropriately cut into a predetermined size and formed into a cylindrical label (stretch label) 8 as shown in FIG. The container 9 is tightly attached by self-shrinkage.
[0037]
At this time, the cylindrical label 8 formed from the tube body of the present embodiment has a strong center seal strength because the surface layers 2 of the both end portions 3a and 3b of the film are securely bonded to each other, so that the bonded portion is peeled off. There is no fear.
[0038]
In addition, the polyethylene resin forming the base material 1 and the surface layer 2 includes the low density polyethylene and the metallocene polyethylene, linear low density polyethylene, ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer. Examples include coalescence and ionomer.
[0039]
Moreover, although the difference of melting | fusing point of the said base material 1 and the surface layer 2 is so preferable that it is large, the said effect will be acquired if there exists a difference of 2-30 degreeC.
[0040]
Next, a second embodiment of the present invention will be described. The drawings and symbols are the same as those in the first embodiment.
[0041]
As shown in FIG. 1, the film 3 formed on the tube body of the second embodiment includes a base material 1 made of a polyethylene resin and having a self-stretching property, and a surface layer 2. It is made of a resin that absorbs laser beam energy more easily than the material 1, that is, it efficiently generates heat when irradiated with laser beam.
[0042]
The substrate 1 is made of linear low density polyethylene, and the surface layer 2 is made of an ethylene-vinyl acetate copolymer containing 3 to 10% vinyl acetate. The ethylene-vinyl acetate copolymer of the surface layer 2 is a material that has better carbon dioxide laser light absorbability and lower melting point than the linear low-density polyethylene of the substrate 1.
[0043]
In addition, about structures other than the material of the said base material 1 and the surface layer 2, it is the same as that of said 1st embodiment.
[0044]
Next, the manufacturing method of the tube body of 2nd embodiment which consists of the said structure is demonstrated.
The film 3 formed on the tube body of the second embodiment is obtained by separating the linear low-density polyethylene constituting the substrate 1 and the ethylene-vinyl acetate copolymer constituting the surface layer 2 by separate extruders. It is produced by a coextrusion method in which it is guided in a molten state and extruded from a single die and laminated. When the film 3 is formed by such a coextrusion method, the layers are bonded to each other in the molten state, so that the characteristics of the layers are not lost.
[0045]
Thereafter, as shown in FIG. 4, the film 3 is formed into a tube body by the same method as in the first embodiment.
[0046]
The film 3 formed on the tube body of the second embodiment has both end portions 3a because the surface layer 2 provided on both sides of the base material 1 is made of a material having better laser light absorption than the base material 1. , 3b when the surface layers 2 (non-printed portions 4a, 4b) are bonded to each other by irradiation with a carbon dioxide laser, the surface layer 2 is heated more efficiently than the base material 1, and the base material 1 is softened or damaged by melting. As a result, the surface layer 2 reaches the bonding temperature and is bonded in a state where there is a small amount, the film strength of the bonded portion can be secured.
[0047]
In addition, since the surface layer 2 is made of a material having a melting point lower than that of the substrate 1, the surface layer 2 can easily reach the bonding temperature, and the film can be bonded more efficiently while ensuring the film strength of the bonded portion.
[0048]
In particular, even when the film 3 is formed in a cylindrical shape and both end portions 3a and 3b are overlapped with each other, even when the laser beam is irradiated from the outer surface side of the outer end portion 3a, the surface layer 2 is formed from the base material 1. Since it can be softened or melted by raising the temperature as soon as possible, it can be reliably bonded while preventing the end portion 3a from being damaged.
[0049]
That is, since the surface layer 2 has good absorbability of laser light, it can be heated even with relatively weak laser light, and the substrate 1 is less likely to absorb laser light (less damage) than the surface layer 2. Even if a relatively strong laser beam is irradiated, it does not melt or cut. As a result, the setting range of the adhesive treatment conditions by the laser beam is widened, and it is easy to control, and a stable center seal strength can be obtained with high production efficiency.
[0050]
The base material 1 may be made of low density polyethylene, and the surface layer 2 may be made of an ionomer having better laser light absorption than the low density polyethylene. In short, the surface layer 2 only needs to be made of a material having better laser light absorption than the substrate 1. However, as in the second embodiment, if the surface layer 2 is made of a material having better laser light absorption and lower melting point than the base material 1, the temperature of the surface layer 2 can be raised to the bonding temperature more efficiently. This is preferable.
[0051]
In the second embodiment, the surface layer 2 is made of a material that absorbs laser beam energy more easily than the substrate 1, but a substance that absorbs laser beam energy is added to the surface layer 2. Also good. For example, 0.1 to 2% by weight of silica fine powder having a particle diameter of 0.1 to 5 μm, and 0.1 to 2% by weight of fine particles such as kaolin, diatomaceous earth, epoxy resin and polymethyl methacrylate are added. Also good. In short, the surface layer 2 only needs to be configured to absorb the energy of the laser beam more easily than the base material 1. For example, the base material 1 may be made of low density polyethylene, and the surface layer 2 may be obtained by adding a laser light absorber to low density polyethylene polymerized using a metallocene catalyst.
[0052]
The present invention is not limited to the configuration of each of the embodiments described above, and can be appropriately modified within the scope intended by the present invention.
[0053]
That is, the resin constituting the substrate 1 and the surface layer 2 is not limited to the polyethylene resin, and a polypropylene resin can also be used.
[0054]
Moreover, although the said 1st and 2nd embodiment demonstrated the case where it was set as the cylindrical label (stretch label) 8 using the stretch film (self-stretchable film) 3 as the film 3 which forms a tube body, this film It is also possible to adopt a heat shrinkable film as a cylindrical shrink label.
[0055]
Furthermore, known additives such as stabilizers, antioxidants, lubricants and antiblocking agents can be appropriately added to the resin forming the substrate 1 and the surface layer 2.
[0056]
Moreover, the thickness of each said layer (the base material 1, the surface layer 2, and the printing layer 4) is not specifically limited.
[0057]
Furthermore, in said 1st and 2nd embodiment, although the film 3 which consists of a three-layer structure of the base material 1 and the surface layer 2 of the both sides of this base material 1 was shown by the coextrusion method, The production method of the film 3 is not limited to this, and a dry laminating method in which a single-layer film of each layer prepared separately is bonded or extrusion in which the surface layer 2 is melt-extruded on both sides of the substrate 1. It can be manufactured by a known technique such as a laminating method.
[0058]
Moreover, in the said 1st and 2nd embodiment, although the printing layer 4 was provided only in the one surface side of the film 3, the printing layer 4 may not be provided also in the other surface side. In the case of this embodiment, the printing layer 4 provided on the other surface side is provided except for the non-printing part 4b of the end part 3b. In short, when the film 3 is formed in a cylindrical shape, the non-printing portions 4a and 4b may be in contact with each other and the surface layers 2 may be bonded to each other.
[0059]
Furthermore, the type of the laser beam is preferably a carbon dioxide laser beam that easily obtains a large capacity, but is not necessarily limited.
[0060]
【The invention's effect】
As described above, since the tube body according to claim 1 is made of a material having a melting point lower than that of the base layer of the film, when both end portions that are formed in a cylindrical shape and overlap are bonded by laser light, Since the surface layer is softened or melted and bonded in a state where damage due to softening or melting of the base material is small, the strength of the laser light and the irradiation time to obtain sufficient center seal strength are ensured. Therefore, it is easy to control, and as a result, stable center seal strength can be obtained with high production efficiency.
[0061]
Further, in the tube body according to claim 2, since the surface layer of the film is made of a material having better laser light absorbability than the base material, both ends formed in a cylindrical shape are bonded by the laser light. In this case, the surface layer reaches the bonding temperature in a state where damage due to softening or melting of the substrate is small, and the film strength is ensured, and the intensity of the laser beam to obtain sufficient center seal strength Moreover, since the range of conditions such as irradiation time is wide, a stable center seal strength can be obtained with high production efficiency.
[0062]
In particular, as in claim 3, if the surface layer is made of a material having better laser light absorption and lower melting point than the base material, the surface layer reaches the bonding temperature more quickly by laser light irradiation. An even more stable center seal strength can be obtained with high production efficiency.
[0063]
In addition, according to the method for manufacturing a tube body according to claim 4, when both ends of the film are bonded by laser light, the surface layer is softened or melted in a state in which damage due to softening or melting of the substrate is small. Therefore, it is possible to efficiently manufacture a tube body having stable center seal strength while ensuring the film strength of the bonded portion.
[0064]
Furthermore, according to the manufacturing method of the tube body according to claim 5, when the both ends of the film are bonded by laser light, the surface layer is heated more efficiently than the base material, and the damage due to softening or melting of the base material Therefore, it is possible to efficiently manufacture a tube body having a stable center seal strength while ensuring the film strength of the bonded portion.
[0065]
In particular, since laser light is irradiated from the outer surface side of the overlapped both ends, the surface layers that are bonded to each other can be quickly heated up to the bonding temperature with little damage to the base material, thus damaging the film It can adhere reliably, preventing this.
[Brief description of the drawings]
FIG. 1 is a partially omitted sectional view showing first and second embodiments of the present invention.
FIG. 2 is a perspective view showing a usage state of each embodiment.
3 is a cross-sectional view taken along the line P-P in FIG. 2;
FIG. 4 is a perspective view showing a manufacturing state of the first and second embodiments of the present invention.
FIG. 5 is a perspective view showing a usage state of each of the embodiments.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Base material 2 ... Surface layer 3 ... Film 3a, 3b ... Both ends 4a, 4b ... Non-printing part

Claims (5)

印刷が施された合成樹脂製のフィルム（３）の両端部（３ａ），（３ｂ）を重ね合わせてレーザー光の照射によって接着することにより筒状に形成され、所望の長さに切断されることにより、容器に外嵌装着される筒状ラベルに形成されるチューブ体において、前記フィルム（３）は、基材（１）と、該基材（１）の両面側に積層された表面層（２）とを備え、該表面層（２）は、前記基材（１）よりも融点の低い材料からなり、フィルム（３）の一面側にはその一方の端部（３ａ）を除いて印刷層（４）が設けられて該一方の端部（３ａ）において表面層（２）が露出し、該印刷層（４）が内面側となるようにフィルム（３）が筒状に形成され且つ前記一方の端部（３ａ）が外側になるようにして両端部（３ａ），（３ｂ）が重ね合わせられてその表面層（２）同士がレーザー光により接着されていることを特徴とするチューブ体。It is formed into a cylindrical shape by overlapping both ends (3a) and (3b) of the printed synthetic resin film (3) and bonding them by laser light irradiation, and cut into a desired length. Accordingly, in the tube body formed on the cylindrical label that is externally fitted to the container, the film (3) includes the base material (1) and a surface layer laminated on both sides of the base material (1). (2), and the surface layer (2) is made of a material having a melting point lower than that of the substrate (1 ), except for one end (3a) on one side of the film (3). The printing layer (4) is provided, the surface layer (2) is exposed at the one end (3a), and the film (3) is formed in a cylindrical shape so that the printing layer (4) is on the inner surface side. In addition, both end portions (3a) and (3b) are overlapped so that the one end portion (3a) is on the outside. Tube body whose surface layer (2) to each other, characterized in that it is bonded by laser light Te. 印刷が施された合成樹脂製のフィルム（３）の両端部（３ａ），（３ｂ）を重ね合わせてレーザー光の照射によって接着することにより筒状に形成され、所望の長さに切断されることにより、容器に外嵌装着される筒状ラベルに形成されるチューブ体において、前記フィルム（３）は、基材（１）と、該基材（１）の両面側に積層された表面層（２）とを備え、該表面層（２）は、前記基材（１）よりもレーザー光の吸収性の良い材料からなり、フィルム（３）の一面側にはその一方の端部（３ａ）を除いて印刷層（４）が設けられて該一方の端部（３ａ）において表面層（２）が露出し、該印刷層（４）が内面側となるようにフィルム（３）が筒状に形成され且つ前記一方の端部（３ａ）が外側になるようにして両端部（３ａ），（３ｂ）が重ね合わせられてその表面層（２）同士がレーザー光により接着されていることを特徴とするチューブ体。It is formed into a cylindrical shape by overlapping both ends (3a) and (3b) of the printed synthetic resin film (3) and bonding them by laser light irradiation, and cut into a desired length. Accordingly, in the tube body formed on the cylindrical label that is externally fitted to the container, the film (3) includes the base material (1) and a surface layer laminated on both sides of the base material (1). (2), and the surface layer (2) is made of a material having better laser light absorptivity than the base material (1 ), and one end (3a) is provided on one side of the film (3). ) Except that the surface layer (2) is exposed at the one end (3a), and the film (3) is cylindrical so that the printed layer (4) is on the inner surface side. Both ends (3a), (3b) so that the one end (3a) is on the outside. Tube body whose surface layer (2) to each other, characterized in that it is bonded by laser light are superimposed. 前記表面層（２）が、前記基材（１）よりも融点の低い材料からなる請求項２記載のチューブ体。  The tube body according to claim 2, wherein the surface layer (2) is made of a material having a melting point lower than that of the base material (1). 所望の長さに切断されることにより、容器に外嵌装着される筒状ラベルに形成されるチューブ体の製造方法であって、印刷を施した合成樹脂製の長尺状のフィルム（３）を繰り出しながらフォーマー（６）に導き該フォーマー（６）でフィルム（３）を筒状に形成しながらその両端部（３ａ），（３ｂ）を重ね合わせてその外面側からレーザー光を照射して順次接着することによりチューブ体を連続的に形成するチューブ体の製造方法において、基材（１）の両面側に該基材（１）よりも融点の低い材料からなる表面層（２）を積層して前記フィルム（３）を構成し、該フィルム（３）の一面側にその一方の端部（３ａ）を除いて印刷層（４）を形成して該一方の端部（３ａ）において表面層（２）が露出した状態とし、該フィルム（３）を印刷層（４）が内面側となるように筒状に形成し且つ前記一方の端部（３ａ）が外側になるようにして両端部（３ａ），（３ｂ）を重ね合わせ、その表面層（２）同士をレーザー光により接着することを特徴とするチューブ体の製造方法。 A method of manufacturing a tube body formed on a cylindrical label that is externally fitted to a container by being cut to a desired length, and is a printed synthetic resin long film (3) forming film (3) into a tubular shape by guiding the former (6) while feeding the former (6) and both end portions of Nagaraso (3a), is irradiated with laser light from the outer surface side by superimposing (3b) In the method of manufacturing a tube body in which the tube body is continuously formed by sequentially bonding the surface layer, a surface layer (2) made of a material having a melting point lower than that of the substrate (1) is formed on both sides of the substrate (1) The film (3) is laminated to form a printed layer (4) except for one end (3a) on one surface side of the film (3), and the one end (3a) With the surface layer (2) exposed, the film (3) The printing layer (4) is formed in a cylindrical shape so as to be on the inner surface side, and both end portions (3a) and (3b) are overlapped so that the one end portion (3a) is on the outer side, and the surface layer ( 2) A method for producing a tube body, wherein the tubes are bonded together by laser light . 所望の長さに切断されることにより、容器に外嵌装着される筒状ラベルに形成されるチューブ体の製造方法であって、印刷を施した合成樹脂製の長尺状のフィルム（３）を繰り出しながらフォーマー（６）に導き該フォーマー（６）でフィルム（３）を筒状に形成しながらその両端部（３ａ），（３ｂ）を重ね合わせてその外面側からレーザー光を照射して順次接着することによりチューブ体を連続的に形成するチューブ体の製造方法において、基材（１）の両面側に該基材（１）よりもレーザー光の吸収性の良い材料からなる表面層（２）を積層して前記フィルム（３）を構成し、該フィルム（３）の一面側にその一方の端部（３ａ）を除いて印刷層（４）を形成して該一方の端部（３ａ）において表面層（２）が露出した状態とし、該フィルム（３）を印刷層（４）が内面側となるように筒状に形成し且つ前記一方の端部（３ａ）が外側になるようにして両端部（３ａ），（３ｂ）を重ね合わせ、その表面層（２）同士をレーザー光により接着することを特徴とするチューブ体の製造方法。 A method of manufacturing a tube body formed on a cylindrical label that is externally fitted to a container by being cut to a desired length, and is a printed synthetic resin long film (3) forming film (3) into a tubular shape by guiding the former (6) while feeding the former (6) and both end portions of Nagaraso (3a), is irradiated with laser light from the outer surface side by superimposing (3b) In the manufacturing method of a tube body in which the tube body is continuously formed by sequentially bonding the surface layer, a surface layer made of a material having better laser light absorption than the base material (1) on both sides of the base material (1) The film (3) is formed by laminating (2), and the printed layer (4) is formed on one surface side of the film (3) except for one end (3a). In (3a), the surface layer (2) is exposed, and Rum (3) is formed in a cylindrical shape so that the printed layer (4) is on the inner surface side, and both ends (3a) and (3b) are overlapped so that the one end (3a) is on the outside A method for producing a tube body , wherein the surface layers (2) are bonded to each other by laser light .
JP31629198A 1998-11-06 1998-11-06 Tube body and manufacturing method thereof Expired - Fee Related JP4211957B2 (en)

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JP4678932B2 (en) * 2000-10-24 2011-04-27 株式会社フジシールインターナショナル Tube body for stretch label
JP2008284794A (en) * 2007-05-18 2008-11-27 Toyobo Co Ltd Heat shrinkable label and method for manufacturing the same
JP2009096527A (en) * 2007-10-18 2009-05-07 Dainippon Printing Co Ltd Shrink label, container with tubular shrink label and manufacturing process therefor
GB2455340A (en) * 2007-12-07 2009-06-10 Lamina Dielectrics Ltd Laser bonding during cable sheath formation
GB2455501B (en) 2007-12-07 2010-08-04 Lamina Dielectrics Ltd Apparatus for manufacturing a tubular product
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