JP2004306366A - Ultrasonic welding structure for plastic product - Google Patents

Ultrasonic welding structure for plastic product Download PDF

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Publication number
JP2004306366A
JP2004306366A JP2003101680A JP2003101680A JP2004306366A JP 2004306366 A JP2004306366 A JP 2004306366A JP 2003101680 A JP2003101680 A JP 2003101680A JP 2003101680 A JP2003101680 A JP 2003101680A JP 2004306366 A JP2004306366 A JP 2004306366A
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JP
Japan
Prior art keywords
ultrasonic horn
ultrasonic welding
ultrasonic
reinforcing rib
plastic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP2003101680A
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Japanese (ja)
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JP3936669B2 (en
Inventor
Futoshi Fujimoto
藤本太
Takahiro Yamauchi
山内崇宏
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NAGOYA NAKANO BUSSAN KK
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NAGOYA NAKANO BUSSAN KK
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Priority to JP2003101680A priority Critical patent/JP3936669B2/en
Publication of JP2004306366A publication Critical patent/JP2004306366A/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
    • 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
    • B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
    • 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
    • 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
    • B29C66/114—Single butt joints
    • B29C66/1142—Single butt to butt 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
    • 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
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/21—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being formed by a single dot or dash or by several dots or dashes, i.e. spot joining or spot 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
    • 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
    • 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
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/54—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles
    • B29C66/543—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles joining more than two hollow-preforms to form said hollow articles
    • 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
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • 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
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81431—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single cavity, e.g. a groove
    • 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
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81433—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined being toothed, i.e. comprising several teeth or pins, or being patterned
    • 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
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/82—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps
    • B29C66/824—Actuating mechanisms
    • B29C66/8242—Pneumatic or hydraulic drives
    • 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
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8322—Joining or pressing tools reciprocating along one axis
    • 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
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/84—Specific machine types or machines suitable for specific applications
    • B29C66/847—Drilling standard machine type
    • 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
    • B29C65/4805—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the type of adhesives
    • B29C65/481—Non-reactive adhesives, e.g. physically hardening adhesives
    • B29C65/4815—Hot melt adhesives, e.g. thermoplastic adhesives
    • 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
    • B29L2031/00—Other particular articles
    • B29L2031/712—Containers; Packaging elements or accessories, Packages

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Rigid Containers With Two Or More Constituent Elements (AREA)
  • Package Closures (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ultrasonic welding structure not having fear such that a metal is mixed as foreign matter when a plastic product such as a container or the like is recycled and capable of holding a joined part to high strength. <P>SOLUTION: The end surfaces 62 of plastic members are butted mutually to form the joined part 7 and a reinforcing rib 8 is arranged so as to straddle the joined part while an ultrasonic welding tool 2 is pressed to the reinforcing rib to ultrasonically weld the plastic members to obtain the plastic product. The ultrasonic welding tool is equipped with unevenness 3 at its leading end part and the reinforcing rib comprises the same material as the plastic members. The joined part is supported by the reinforcing rib. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
この発明は、同じ材質のプラスチック部材同士を超音波溶着することによって得られるプラスチック製品の超音波溶着構造に関する。特に、ポリプロピレン製のコンテナーを超音波溶着によって接合した超音波溶
着構造であって、接合部を高強度に保ち、しかも希望の長さのプラスチック製品を容易に得ることができる超音波溶着構造を提供する。
【０００２】
【従来の技術】
各種規格のプラスチック製品の在庫数を最小限に抑え、効率的に管理するために、必要の都度、希望の長さのものを得る接続方法が、従来から実施されている。一つは、ポリプロピレン製のコンテナーを継ぎ足して長尺化する際、接合面間に金属をあてがって、リベットで接合する方法が汎用されている。一方、超音波振動により、接合面間に発生する摩擦熱を利用して、同じプラスチック材質同士のコンテナーを溶着する超音波溶着も行われている。この場合、超音波溶着に使用する超音波溶着工具の先端部が平坦状のものを使用して溶着する技術は、既に開発されている。
【０００３】
従来の、リベットで接合し、長尺化したコンテナーの斜視図を図１示す。コンテナー６１同士の、端面を突き合わせ、隙間を有する接合部７を形成する。この接合部を跨ぐように、継ぎ板７１をあてがい、リベット７３によって、コンテナー６１同士が接合される。さらに、コンテナーの縁部は、接合部７を跨って、継ぎ枠７２で補強、連結されている。ここで、継ぎ板７１および継ぎ枠７２は金属製で、例えば、アルミニュウムである。また、リベット７３自身も金属である。このため、継ぎ足し、長尺化したコンテナーや段ボールを、用済み後リサイクルするに際し、これらの金属がプラスチック材の中に異物として混入することが避けられず、分別が厄介である。
【０００４】
次に、超音波溶着装置を図２に示す。超音波溶着装置１は、超音波溶着ヘッド１０の他、図示しない超音波の発信手段、エアシリンダの加圧手段等を具備している。溶着ヘッド１０の先端部には、超音波溶着工具である超音波ホーン２を設けている。作業台１１の上に置かれたワーク６の接合部７の位置に、超音波ホーン２を押し当て、接合部を加圧しながら超音波振動を施すことによって、ワーク３の接合部７が加熱、溶着される。図３には、種々の超音波ホーンおよびその先端部の形状を示す。丸型超音波ホーン２１、正方形型超音波ホーン２２および長方形型超音波ホーン２３のそれぞれの超音波ホーン先端部２１１、２２１および２３１は、図示の通り平坦状である。このような、先端部が平坦状の超音波ホーンを使用して溶着したものは、接合部の溶着強度が低いという問題があった。理由は、次のとおりである。プラスチック部材の接合部の位置に、超音波ホーンを押し当て、超音波振動を施すことによって、接合面間に発生する摩擦熱のため、ワークは軟化する。超音波ホーンの先端部に凹凸がなく、平坦な場合、超音波ホーンの先端部は軟化したワークへの食い込みが浅くなりがちである。そのため、接合部の溶着強度が低くなる。
【０００５】
【発明が解決しようとする課題】
本発明は、上記事情に鑑みて、コンテナー等のプラスチック製品をリサイクルするに際し、金属が異物としてプラスチックの中に混入することがなく、しかも、プラスチック部材同士の接合部の強度を高め、希望の長さプラスチック製品を得ることができる超音波溶着構造を提供するものである。
【０００６】
【課題を解決するための手段】
上記目的を達成するために、請求項１の発明は、プラスチック部材の端面同士を突合せて接合部を形成し、該接合部を跨ぐように補強リブを配し、該補強リブに超音波溶着工具を押し当て超音波溶着してなるプラスチック製品であって、前記超音波溶着工具は、先端部に凹凸を備えており、前記補強リブは、前記プラスチック部材と同材質であり、前記接合部は、前記補強リブによって支持されていることを特徴とする。
【０００７】
また、請求項２の発明は、請求項１の発明の上記特徴に加えて、前記補強リブには、超音波溶着した痕からなる凹凸が形成されていることを特徴とする。
【０００８】
【発明の実施の形態】
本発明の実施の形態を、添付図面に例示した本発明の実施例に基ずいて以下に具体的に説明する。
【０００９】
先ず、本発明の実施例ついて、図４〜図１３を参照しながら説明する。図４は、超音波溶着の要領を示す説明図である。図５は、丸凸型超音波ホーンの平面図である。図６は、丸凸型超音波ホーンの側面図である。図７は、別の丸凸型超音波ホーンの平面図である。図８は、丸凸型超音波ホーンの側面図である。図９は、角凸型超音波ホーンの平面図である。図１０は、角凸型超音波ホーンの側面図である。図１１は、両袖型超音波ホーンの平面図である。図１２は、両袖型超音波ホーンの側面図である。図１３は、両袖型超音波ホーンを使用して、コンテナーの角隅部を溶着して長尺化する状態を示す図である。
【００１０】
先ず、図４を参照して、本発明の超音波溶着の要領を説明する。作業台１１の上に、ワーク６が配置され、そして、それぞれの端面６２を突き合わせるように、隙間を有する接合部７が形成される。さらに、接合部７を跨って、補強リブ８をあてがう。ここで、ワーク６と補強リブ８とは、同じ材質のプラスチックである。この補強リブの上に、超音波溶着工具である超音波ホーン２が位置決めされる。この超音波ホーンの先端部には、凸部３が設けられている。超音波ホーンの先端部を補強リブ８に押し当て、超音波振動を施しながら加圧する。こうして、ワーク６と補強リブ８との接合面間に摩擦熱が発生し、ワーク６と補強リブ８とが接合される。補強リブとワークとは同材質で、融合、溶着し合っているので、どちらか一方が、接合部から剥離するようなことがない。なお、超音波ホーン２は金属製で、例えば材質はアルミニュウムである。ここで、ワーク６の端部は突き合わせた状態であり、重なり合っていないので、接合部の材料の歩留まりが良い。
【００１１】
超音波ホーンの実施例について説明する。図５および図６に示すように、丸凸型超音波ホーンの先端部には丸状の凸部３を二箇所設けている。さらに、凸部３にはそれぞれ、十文字状の凹溝４を備えている。先端部は、二箇所の丸状の凸部３を設けることにより、凹凸を形成し、さらに、丸状の凸部３の中には、十文字状の凹溝４を備えることにより凹凸を形成している。全体では、超音波ホーンの先端部は、二重に凹凸を形成した構造からなっている。本超音波ホーンは、細長い帯状のプラスチック部材あるいは製品同士の接合に好適である。
【００１２】
次に、図７および図８に示すように、丸凸型超音波ホーンの先端部には丸状の凸部３を四箇所設けている。さらに、凸部３にはそれぞれ、十文字状の溝４を備えている。先端部は、四箇所の丸状の凸部３を設けることにより、凹凸を形成し、さらに、丸状の凸部３の中には、十文字状の溝を備えることにより凹凸を形成していることは、図５および図６と同様である。全体では、超音波ホーンの先端部は、二重に凹凸を形成した構造からなっている。
【００１３】
また、図９および図１０に示すように、角凸型超音波ホーンの先端部には角状の凸部３を多数箇所備えている。さらに、凸部３の間には凹溝４が交叉している。先端部は、多数箇所の角状の凸部３とその間をめぐる凹溝４からなる凹凸を形成した構造となっている。本超音波ホーンは、幅広のプラスチック部材あるいは製品同士の接合に好適である。
【００１４】
以上、丸状および角状の凸部を備えた超音波ホーンについて説明した。
ここで、接着強度におよぼす凸部の形状の差は明確ではない。大事なことは、軟化したプラスチック部材への超音波ホーンの先端の食い込み度合いである。食い込みが深いほど接着強度は高くなる。
【００１５】
また、図１１および図１２に、両袖型超音波ホーンを示す。超音波ホーンの先端部には角状の凸部３を多数箇所備えている。さらに、凸部３の間には凹溝４が交叉している。先端部は、多数箇所の角状の凸部３とその間をめぐる凹溝４からなる凹凸を形成した構造となっている。本超音波ホーンの先端部は、袖部５が両側へ開いた構造であり、この袖部の背後には、逃げ５１を設けている。図１３に示すように、この逃げを設けたことにより、コンテナー等の角隅部を溶着する際、超音波ホーンがコンテナーの上縁６１２にぶつかる等の障害が避けられ、好都合である。
【００１６】
図１３には、両袖型超音波ホーンを使用して、コンテナーの角隅である縁部を溶着し、長尺化する状態を示す。作業台の上にコンテナー６１が、それぞれの端面６２を突き合わせるように、隙間を有する接合部７が、コンテナーの底、側面および縁部に形成される。これらのコンテナーの上に、接合部７を跨ぐように、補強リブ８をあてがう。ここで、ワークであるコンテナー６１と補強リブ８とは、同じプラスチック材質である。この補強リブの上に両袖型超音波ホーン２が位置決めされる。この超音波ホーンの先端部には、凸部３が設けられている。この超音波ホーンは、両袖型であり、袖部５が両側に開き、この袖部の背後に逃げ５１が設けられている。ここで、コンテナーは、底６１１の外周部に底縁６１２と、この反対側に上縁６１３を備えている。この上縁６１３の接合部７を跨ぐように、補強リブ８を配置し、超音波溶着する。超音波ホーンには、逃げ５１を備えているので、コンテナーの上縁６１３の角隅に超音波ホーンを位置決めしても、底縁６１２に超音波ホーンが当たって邪魔になることはない。本図では、両袖型を示したが、逃げ５１を設けているなら、片袖型でもよい。なお、底６１１と底縁６１２の接合部７を跨ぐように、複数の補強リブ８を示したが、すでに溶着が完了したものである。溶着する際、超音波ホーンの先端凸部３および凹溝４の痕である凹凸痕９が形成されている。このことは、超音波ホーンの先端部が、補強リブ８に食い込み、さらに、補強リブがコンテナーと融合、溶着し合ったことを示す。このように、補強リブとコンテナーとは、同材質であり、溶着し合っているので、どちらか一方が、接合部から剥離するようなことがない。また、ここで使用したコンテナーは、規格品の片側の端面あるいは両端面を取り除き、それぞれの端面を付き合わせ、図示のように、接合したものである。
【００１７】
なお、実施例ではコンテナーの超音波溶着について説明したが、段ボールでも同じ要領で実施可能である。この場合、前記したような、逃げ５１を設けた両袖型超音波ホーンは、必ずしも必要ではない。図５〜図１０に示した超音波ホーンで十分対応可能である。
【００１８】
本発明のプラスチック製品は、前記したコンテナーの他、ポリプロピレン発泡シート、ポリエチレンシート、ナイロンマジックテープ（登録商標）、プラスチック段ボール、プラスチックコンテナー用のカード差し、塩化ビニールシート等を含む。
【００１９】
【発明の効果】
本発明のプラスチック製品は、同じ材質同士の接合なので、用済み後リサイクルするに際し、金属がプラスチック材の中に異物として混入することがない。また、生産するコンテナーの規格、品数が増えても、各種のコンテナーを準備する必要がない。即ち、入れる製品のサイズに合わせた、希望の長さ、幅のコンテナーが容易に得られ、在庫数を必要最小限に抑えて効率的に管理することができる。また、接合した部分の外観および物性（引張り強度、伸び、耐折強度）は、非接合部と大差がない。さらに、接合部分を廃棄する必要がないので、材料の歩留まりが大幅に改善されて、極めて有用である。
【図面の簡単な説明】
【図１】従来例を示すもので、リベットで接合したコンテナーの斜視図である。
【図２】超音波溶着装置の側面図である。
【図３】従来例を示すもので、種々の超音波ホーンの先端部の斜視図を示す。
【図４】本発明の実施例を示すもので、超音波溶着の要領を示す説明図である。
【図５】本発明の実施例を示すもので、丸凸型超音波ホーンの平面図である。
【図６】同上、丸凸型超音波ホーンの側面図である。
【図７】同上、丸凸型超音波ホーンの平面図である。
【図８】同上、丸凸型超音波ホーンの側面図である。
【図９】同上、角凸型超音波ホーンの平面図である。
【図１０】同上、角凸型超音波ホーンの側面図である。
【図１１】同上、両袖型超音波ホーンの平面図である。
【図１２】同上、両袖型超音波ホーンの側面図である。
【図１３】同上、本発明の両袖型超音波ホーンを使用して、コンテンナーの角隅部を溶着する状態を示す図である。
【符号の説明】
１ 超音波溶着装置
２ 超音波ホーン
２１ 丸型超音波ホーン
２１１ 丸型超音波ホーン先端部
２２ 正方形型超音波ホーン
２２１ 正方形型超音波ホーン先端部
２３ 長方形型超音波ホーン
２３１ 長方形型超音波ホーン先端部
３ 凸部
４ 凹溝
５ 袖
５１ 逃げ
６ ワーク
６１ コンテナー
６１１ 底
６１２ 底縁
６１３ 上縁
６２ 端面
７ 接合部
７１ 継ぎ板
７２ 継ぎ枠
７３ リベット
８ 補強リブ
９ 凹凸痕
１０ 溶着ヘッド
１１ 作業台[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an ultrasonic welding structure of a plastic product obtained by ultrasonic welding of plastic members of the same material. In particular, an ultrasonic welding structure in which a polypropylene container is joined by ultrasonic welding to provide an ultrasonic welding structure that can maintain a high joint strength and can easily obtain a plastic product of a desired length. I do.
[0002]
[Prior art]
2. Description of the Related Art In order to minimize the number of stocks of plastic products of various standards and efficiently manage them, connection methods for obtaining desired lengths of plastic products have been conventionally implemented whenever necessary. One is a method in which a metal is applied between joining surfaces and joined with rivets when a polypropylene container is added and lengthened. On the other hand, ultrasonic welding is also performed in which containers made of the same plastic material are welded by utilizing frictional heat generated between joining surfaces by ultrasonic vibration. In this case, a technique for welding using an ultrasonic welding tool having a flat end portion used for ultrasonic welding has already been developed.
[0003]
FIG. 1 is a perspective view of a conventional container that has been elongated by joining with rivets. The end faces of the containers 61 are abutted to form a joint 7 having a gap. The connecting plate 71 is applied so as to straddle the joining portion, and the containers 61 are joined by the rivets 73. Further, the edge of the container is reinforced and connected with a joint frame 72 across the joint 7. Here, the joint plate 71 and the joint frame 72 are made of metal, for example, aluminum. The rivet 73 itself is also a metal. For this reason, when the added and elongated containers and corrugated cardboard are recycled after use, it is inevitable that these metals are mixed as foreign substances into the plastic material, and sorting is troublesome.
[0004]
Next, an ultrasonic welding apparatus is shown in FIG. The ultrasonic welding device 1 includes, in addition to the ultrasonic welding head 10, a not-shown ultrasonic transmitting unit, an air cylinder pressurizing unit, and the like. An ultrasonic horn 2 which is an ultrasonic welding tool is provided at the tip of the welding head 10. The ultrasonic horn 2 is pressed against the position of the joint 7 of the work 6 placed on the work table 11, and the ultrasonic vibration is applied while pressurizing the joint, thereby heating the joint 7 of the work 3. Welded. FIG. 3 shows various ultrasonic horns and the shapes of the tips thereof. The ultrasonic horn tips 211, 221, and 231 of the round ultrasonic horn 21, the square ultrasonic horn 22, and the rectangular ultrasonic horn 23 are flat as shown. Such welding using an ultrasonic horn having a flat end portion has a problem that the welding strength at the joint is low. The reason is as follows. By pressing the ultrasonic horn against the position of the joint of the plastic member and applying ultrasonic vibration, the work is softened due to frictional heat generated between the joint surfaces. If the tip of the ultrasonic horn is flat without any irregularities, the tip of the ultrasonic horn tends to bite into the softened work. Therefore, the welding strength at the joint is reduced.
[0005]
[Problems to be solved by the invention]
The present invention has been made in view of the above circumstances, and when recycling plastic products such as containers, metal is not mixed into plastics as foreign matter, and the strength of the joints between plastic members is increased to achieve a desired length. It is an object of the present invention to provide an ultrasonic welding structure capable of obtaining a plastic product.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, a joining portion is formed by abutting end faces of a plastic member, and a reinforcing rib is arranged so as to straddle the joining portion. A plastic product obtained by pressing and ultrasonic welding, the ultrasonic welding tool is provided with irregularities at the tip, the reinforcing ribs are the same material as the plastic member, the joining portion, It is characterized by being supported by the reinforcing rib.
[0007]
According to a second aspect of the present invention, in addition to the features of the first aspect of the present invention, the reinforcing ribs are formed with irregularities formed by ultrasonic welding marks.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiments of the present invention will be specifically described below based on embodiments of the present invention illustrated in the accompanying drawings.
[0009]
First, an embodiment of the present invention will be described with reference to FIGS. FIG. 4 is an explanatory view showing the procedure of ultrasonic welding. FIG. 5 is a plan view of the round convex ultrasonic horn. FIG. 6 is a side view of the round convex ultrasonic horn. FIG. 7 is a plan view of another round convex ultrasonic horn. FIG. 8 is a side view of the round convex ultrasonic horn. FIG. 9 is a plan view of the angular convex ultrasonic horn. FIG. 10 is a side view of the angular convex ultrasonic horn. FIG. 11 is a plan view of a double-sleeve ultrasonic horn. FIG. 12 is a side view of a double-sleeve ultrasonic horn. FIG. 13 is a view showing a state where the corners of the container are welded and lengthened using a double-sleeve ultrasonic horn.
[0010]
First, the procedure of the ultrasonic welding according to the present invention will be described with reference to FIG. The work 6 is arranged on the worktable 11, and a joint 7 having a gap is formed so that the end faces 62 abut each other. Further, a reinforcing rib 8 is applied across the joint 7. Here, the work 6 and the reinforcing ribs 8 are plastics of the same material. An ultrasonic horn 2, which is an ultrasonic welding tool, is positioned on the reinforcing rib. A projection 3 is provided at the tip of the ultrasonic horn. The tip of the ultrasonic horn is pressed against the reinforcing ribs 8 and pressurized while applying ultrasonic vibration. Thus, frictional heat is generated between the joining surfaces of the work 6 and the reinforcing rib 8, and the work 6 and the reinforcing rib 8 are joined. Since the reinforcing rib and the work are made of the same material, and are fused and welded to each other, one of them does not peel off from the joint. The ultrasonic horn 2 is made of metal, for example, aluminum. Here, since the ends of the work 6 are in abutting state and do not overlap with each other, the yield of the material at the joint is good.
[0011]
An embodiment of the ultrasonic horn will be described. As shown in FIGS. 5 and 6, two round convex portions 3 are provided at the tip of the round convex ultrasonic horn. Further, each of the convex portions 3 is provided with a cross-shaped concave groove 4. The tip portion is provided with two round convex portions 3 to form irregularities, and furthermore, the round convex portions 3 are formed with cross-shaped concave grooves 4 to form irregularities. ing. As a whole, the tip portion of the ultrasonic horn has a structure in which double irregularities are formed. The present ultrasonic horn is suitable for connecting a slender strip-shaped plastic member or products.
[0012]
Next, as shown in FIGS. 7 and 8, four round convex portions 3 are provided at the tip of the round convex ultrasonic horn. Further, each of the protrusions 3 is provided with a cross-shaped groove 4. The tip portion has irregularities formed by providing four rounded convex portions 3, and furthermore, has irregularities formed by providing cross-shaped grooves in the rounded convex portions 3. This is the same as FIG. 5 and FIG. As a whole, the tip portion of the ultrasonic horn has a structure in which double irregularities are formed.
[0013]
Further, as shown in FIGS. 9 and 10, the tip of the angular convex ultrasonic horn is provided with a large number of angular convex portions 3 at the tip. Further, the concave grooves 4 intersect between the convex portions 3. The distal end portion has a structure in which irregularities including a plurality of angular convex portions 3 and concave grooves 4 surrounding them are formed. The ultrasonic horn is suitable for joining wide plastic members or products.
[0014]
The ultrasonic horn having the round and square convex portions has been described above.
Here, the difference in the shape of the convex portion affecting the adhesive strength is not clear. What is important is the degree of penetration of the tip of the ultrasonic horn into the softened plastic member. The deeper the bite, the higher the adhesive strength.
[0015]
11 and 12 show a double-sleeve ultrasonic horn. The ultrasonic horn has a large number of angular projections 3 at its tip. Further, the concave grooves 4 intersect between the convex portions 3. The distal end portion has a structure in which irregularities including a plurality of angular convex portions 3 and concave grooves 4 surrounding them are formed. The distal end of the ultrasonic horn has a structure in which sleeves 5 are opened to both sides, and an escape 51 is provided behind the sleeves. As shown in FIG. 13, by providing this relief, when welding a corner of a container or the like, an obstacle such as the ultrasonic horn colliding with the upper edge 612 of the container is avoided, which is convenient.
[0016]
FIG. 13 shows a state in which the edges, which are the corners of the container, are welded and lengthened using a double-sleeve ultrasonic horn. A gap 7 is formed at the bottom, side and edge of the container so that the container 61 abuts the respective end faces 62 on the workbench. Reinforcing ribs 8 are applied over these containers so as to straddle the joints 7. Here, the container 61 and the reinforcing rib 8, which are works, are made of the same plastic material. The two-sleeved ultrasonic horn 2 is positioned on the reinforcing rib. A projection 3 is provided at the tip of the ultrasonic horn. This ultrasonic horn is of a double-sleeve type, with a sleeve portion 5 opened on both sides, and an escape 51 provided behind the sleeve portion. Here, the container has a bottom edge 612 on the outer periphery of the bottom 611 and an upper edge 613 on the opposite side. The reinforcing ribs 8 are arranged so as to straddle the joining portion 7 of the upper edge 613, and are ultrasonically welded. Since the ultrasonic horn is provided with the escape 51, even if the ultrasonic horn is positioned at the corner of the upper edge 613 of the container, the ultrasonic horn does not hit the bottom edge 612 and does not interfere. In this drawing, a two-sleeve type is shown, but a single-sleeve type may be used if the escape 51 is provided. Although the plurality of reinforcing ribs 8 are shown so as to straddle the joint 7 between the bottom 611 and the bottom edge 612, the welding has already been completed. At the time of welding, an uneven mark 9 which is a mark of the tip convex portion 3 and the concave groove 4 of the ultrasonic horn is formed. This indicates that the tip of the ultrasonic horn bites into the reinforcing rib 8, and the reinforcing rib is fused and welded to the container. As described above, since the reinforcing rib and the container are made of the same material and are welded to each other, one of the reinforcing rib and the container does not peel off from the joint. In addition, the container used here is one in which one end face or both end faces of the standard product is removed, and the respective end faces are joined and joined as shown in the figure.
[0017]
In the embodiment, the ultrasonic welding of the container has been described. However, the present invention can be applied to a corrugated cardboard in the same manner. In this case, the double-sleeved ultrasonic horn provided with the relief 51 as described above is not always necessary. The ultrasonic horn shown in FIGS.
[0018]
The plastic product of the present invention includes, in addition to the above-mentioned container, a polypropylene foam sheet, a polyethylene sheet, nylon magic tape (registered trademark), a plastic cardboard, a card holder for a plastic container, a vinyl chloride sheet, and the like.
[0019]
【The invention's effect】
Since the plastic products of the present invention are made of the same material, the metal does not enter the plastic material as foreign matter when recycled after use. In addition, there is no need to prepare various types of containers even if the standards and the number of containers to be produced increase. In other words, a container having a desired length and width according to the size of the product to be put in can be easily obtained, and the number of inventories can be minimized and managed efficiently. Further, the appearance and physical properties (tensile strength, elongation, bending strength) of the joined portion are not much different from those of the non-joined portion. Furthermore, since the joint does not need to be discarded, the yield of the material is greatly improved, which is extremely useful.
[Brief description of the drawings]
FIG. 1 shows a conventional example and is a perspective view of a container joined by rivets.
FIG. 2 is a side view of the ultrasonic welding device.
FIG. 3 shows a conventional example, and shows perspective views of tips of various ultrasonic horns.
FIG. 4 illustrates an embodiment of the present invention and is an explanatory view illustrating a procedure of ultrasonic welding.
FIG. 5, showing an embodiment of the present invention, is a plan view of a round convex ultrasonic horn.
FIG. 6 is a side view of the round convex ultrasonic horn according to the first embodiment;
FIG. 7 is a plan view of the round convex ultrasonic horn according to the first embodiment;
FIG. 8 is a side view of the round convex ultrasonic horn.
FIG. 9 is a plan view of the angular convex ultrasonic horn;
FIG. 10 is a side view of the angular convex ultrasonic horn.
FIG. 11 is a plan view of the double-sleeved ultrasonic horn according to the first embodiment;
FIG. 12 is a side view of the double sleeve ultrasonic horn according to the first embodiment;
FIG. 13 is a diagram showing a state where the corners of the container are welded using the double-sleeve ultrasonic horn of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Ultrasonic welding device 2 Ultrasonic horn 21 Round ultrasonic horn 211 Round ultrasonic horn tip 22 Square ultrasonic horn 221 Square ultrasonic horn distal end 23 Rectangular ultrasonic horn 231 Rectangular ultrasonic horn distal end Part 3 Convex part 4 Groove 5 Sleeve 51 Escape 6 Work 61 Container 611 Bottom 612 Bottom edge 613 Top edge 62 End face 7 Joint part 71 Joint plate 72 Joint frame 73 Rivets 8 Reinforcement rib 9 Uneven marks 10 Welding head 11 Work bench

Claims (2)

プラスチック部材の端面同士を突合せて接合部を形成し、該接合部を跨ぐように補強リブを配し、そして、該補強リブに超音波溶着工具を押し当て超音波溶着してなるプラスチック製品であって、前記超音波溶着工具は、先端部に凹凸を備えており、前記補強リブは、前記プラスチック部材と同材質であり、前記接合部は、前記補強リブによって支持されていることを特徴とするプラスチック製品の超音波溶着構造。A plastic product formed by joining the end faces of the plastic members to form a joint, arranging a reinforcing rib so as to straddle the joint, and pressing an ultrasonic welding tool against the reinforcing rib to perform ultrasonic welding. The ultrasonic welding tool is provided with irregularities at a tip portion, the reinforcing rib is made of the same material as the plastic member, and the joint is supported by the reinforcing rib. Ultrasonic welding structure for plastic products. 前記補強リブには、超音波溶着した痕からなる凹凸が形成されていることを特徴とする請求項１記載のプラスチック製品の超音波溶着構造。The ultrasonic welding structure for a plastic product according to claim 1, wherein the reinforcing ribs are formed with irregularities formed by ultrasonic welding marks.
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008188976A (en) * 2007-02-08 2008-08-21 Munekata Co Ltd Reinforced structure of adhesive part of plastic corrugated board and heat chip for obtaining the same
CN100556669C (en) * 2005-03-22 2009-11-04 名古屋中野物产株式会社 Ultrasonic welding structure
FR3076232A1 (en) * 2017-12-28 2019-07-05 Compagnie Plastic Omnium SONOTRODE
WO2021237372A1 (en) * 2020-05-26 2021-12-02 Wenco S.A. Mechanism for the ultrasonic bonding of foldable parts of a plastic container and associated method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100556669C (en) * 2005-03-22 2009-11-04 名古屋中野物产株式会社 Ultrasonic welding structure
JP2008188976A (en) * 2007-02-08 2008-08-21 Munekata Co Ltd Reinforced structure of adhesive part of plastic corrugated board and heat chip for obtaining the same
FR3076232A1 (en) * 2017-12-28 2019-07-05 Compagnie Plastic Omnium SONOTRODE
WO2021237372A1 (en) * 2020-05-26 2021-12-02 Wenco S.A. Mechanism for the ultrasonic bonding of foldable parts of a plastic container and associated method

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