JP2004243657A - Method for joining heat sealable tube - Google Patents

Method for joining heat sealable tube Download PDF

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Publication number
JP2004243657A
JP2004243657A JP2003035991A JP2003035991A JP2004243657A JP 2004243657 A JP2004243657 A JP 2004243657A JP 2003035991 A JP2003035991 A JP 2003035991A JP 2003035991 A JP2003035991 A JP 2003035991A JP 2004243657 A JP2004243657 A JP 2004243657A
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JP
Japan
Prior art keywords
joining
close contact
heat
tubular body
heating
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
JP2003035991A
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Japanese (ja)
Other versions
JP4106287B2 (en
Inventor
Eishin Yamagishi
英信 山岸
Yutaka Shimoda
裕 下田
Tateo Tomizawa
建雄 富沢
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Nichias Corp
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Nichias Corp
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Publication date
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Priority to JP2003035991A priority Critical patent/JP4106287B2/en
Publication of JP2004243657A publication Critical patent/JP2004243657A/en
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Publication of JP4106287B2 publication Critical patent/JP4106287B2/en
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Classifications

    • 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
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • 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
    • B29C66/116—Single bevelled joints, i.e. one of the parts to be joined being bevelled in the joint area
    • B29C66/1162—Single bevel to bevel joints, e.g. mitre 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
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/122—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section
    • B29C66/1224—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section comprising at least a butt joint-segment
    • 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
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/122—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section
    • B29C66/1226—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section comprising at least one bevelled joint-segment
    • 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
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/122—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section
    • B29C66/1226—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section comprising at least one bevelled joint-segment
    • B29C66/12261—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section comprising at least one bevelled joint-segment the two joint-segments being bevelled, e.g. the two joint-segments forming a V
    • 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
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/124—Tongue and groove joints
    • B29C66/1244—Tongue and groove joints characterised by the male part, i.e. the part comprising the tongue
    • B29C66/12443—Tongue and groove joints characterised by the male part, i.e. the part comprising the tongue having the tongue substantially in the middle
    • 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
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/124—Tongue and groove joints
    • B29C66/1246—Tongue and groove joints characterised by the female part, i.e. the part comprising the groove
    • B29C66/12463—Tongue and groove joints characterised by the female part, i.e. the part comprising the groove being tapered
    • B29C66/12464—Tongue and groove joints characterised by the female part, i.e. the part comprising the groove being tapered being V-shaped
    • 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
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/128—Stepped joint cross-sections
    • B29C66/1282—Stepped joint cross-sections comprising at least one overlap joint-segment
    • 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
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/128—Stepped joint cross-sections
    • B29C66/1284—Stepped joint cross-sections comprising at least one butt joint-segment
    • B29C66/12841—Stepped joint cross-sections comprising at least one butt joint-segment comprising at least two butt joint-segments
    • 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
    • B29C66/14—Particular design of joint configurations particular design of the joint cross-sections the joint having the same thickness as the thickness of the parts 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
    • 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
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/522—Joining tubular articles
    • B29C66/5221—Joining tubular articles for forming coaxial connections, i.e. the tubular articles to be joined forming a zero angle relative to each other
    • 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
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/522—Joining tubular articles
    • B29C66/5229—Joining tubular articles involving the use of a socket
    • 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
    • B29C66/63—Internally supporting the 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
    • B29C66/80—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
    • B29C66/828—Other pressure application arrangements
    • B29C66/8284—Other pressure application arrangements using the thermal expansion of the joining tool
    • 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
    • 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
    • B29C66/812—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 composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/8122—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 composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps characterised by the composition of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • 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
    • B29L2023/00—Tubular articles
    • B29L2023/22—Tubes or pipes, i.e. rigid

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Branch Pipes, Bends, And The Like (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a simple method for joining a heat sealable tube in which the inner surface of a joining part is level and has no level difference and which has high joining strength in a method for joining the end surfaces of a pair of the tubes together. <P>SOLUTION: Both end surfaces of the heat sealable tube having end surfaces which have the same opening shape and in which wall parts can closely contact each other are closely contacted with each other so that the inner wall surface of the contact part can maintain evenness in the axial direction. An internal support which contacts the inner wall surface of the contact part by thermal expansion by heating during joining and can press the surface is inserted into the hollow part on the inner wall side of the contact part. An external support having a shaft hole which approximately externally contact the outside of the contact part is fitted. By heating the external support, the joining end surface contact part and the internal support are heated. The tubes are joined together by welding the contact part while the contact part is pressed from the inner surface by the internal support expanded by heating. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本願発明は、熱融着性管状体の接合方法に関するものであり、詳しくは接合部内面が平準で段差が無く、且つ接合強度が優れた熱融着性管状体の簡便な接合方法に関する。
【０００２】
【従来の技術】
従来、純水などの高純度液体の移送用プラスチックス管の接合は、当該液体が滞留する原因となる接合部の段差、凹凸の形成を防ぐため、例えば、その軸方向に対して垂直な端面同士を接合する管の内部空間に、機械的にあるいは加圧空気等の圧力媒体を用いた拡張可能な内周面支持装置（例えば、特許文献１参照。）または圧力媒体によって膨張させることが出来る耐熱性エラストマー製の袋状内周支持装置（例えば、特許文献２参照。）を配置してそれぞれ接合部内壁面を押圧し、溶接完了後に当該内周面支持装置を復元変形させて縮小し、管状部材内部空間から取り出すことにより溶接領域に接合部内面から溶接ビードを突起させないで平滑な内壁面を形成するようにする方法が知られている。
【０００３】
あるいは、二つの管体をその軸方向に対して垂直な端面同士が対峙する位置に配し、その対峙した管体の内側に、高温時には管体の内径寸法と略同じ外径を有するように形状を記憶させた後、低温時に管体の内径寸法より小径になるように変形されている形状記憶合金からなる芯体を配置し、当該管体の両端面を加熱溶融させると同時に該芯体を加熱することにより記憶形状に復帰させて管体の接合面の内側から押圧しつつ端面同士を突き合わせて溶接する方法（例えば、特許文献３参照。）が知られている。
【０００４】
さらに、接合部の管内部に治具を使用しない方法として、互いに突き合わされる両管の管端肉部の内壁面側肉部が管軸方向に突出するような斜面に形成して外周面側に三角状の空間を生じさせ、その両突出先端を突き合わせ、両管端部を互いに対向方向へ押圧しつつ溶融温度にまで加熱して溶融接着し、押圧により形成される塊部分を接合部分の上記の三角状の空間内方向にのみ移動させて、内面側を平滑にすることを目的とするプラスチック管の接合方法（例えば、特許文献４参照。）が知られている。
【０００５】
【特許文献１】
特開平０１−１１０１２７号公報
【特許文献２】
特開平０３−０９２３３５号公報
【特許文献３】
特開平０５−１０４６３２号公報
【特許文献４】
特開平０２−２６６１９１号公報
【０００６】
【発明が解決しようとする課題】
しかしながら、上記の特許文献１，特許文献２および特許文献３に記載の接合方法において使用する管接合部内面側に装着する支持装置あるいは形状記憶合金から成る芯体は、構成および操作が複雑である。さらに、上記の特許文献１〜３に記載の接合方法では、いずれも接合面が軸方向に垂直であって接合時には両端面を軸方向に互いに押圧する必要がある。
【０００７】
このため押圧力が管状体の樹脂が溶融する接合面に集中するため接合面では厚さが盛り上がりが生じやすく、上記の内部支持体を併用しても接合部における厚さ斑が大きくなりやすいのみならず、管の肉厚に相当する面積のみで接合されるため接合面積が小さく、接合強度が充分でない。また、上記の特許文献４に記載の接合方法は接合部の管内部に治具を使用しない方法であるため内面側への湾曲・突出が避けられず、接合部に段差が生じたり、接合部内壁面の平坦性あるいは平準性（内径の均一性）が不十分となる。
【０００８】
本発明は、上記実情に鑑みなされたものであり、その目的は、接合部内面の平準性および接合強度が優れた、熱融着性管状体およびその操作が簡便な接合方法を提供することにある。
【０００９】
【課題を解決するための手段】
本発明者は、上記の目的達成のため、種々検討を進めた結果、管の接合部内壁面の平準性を維持しつつ両接合面を密接させ、且つ管の接合部内中空部に接合時の加熱による熱膨張により管の密接部内壁面に内接して押圧することが出来る内部支持体を挿入することにより、加熱接合することにより上記の目的を達成することが出来ることを見出し、本発明に達したものである。
【００１０】
すなわち、本発明の要旨は、一対の熱融着性管状体の接合方法であって、当該両管状体の接合用末端はその開口形状が同一で且つ肉部が互いに密接しうる端面を有し、当該両端面を密接させて密接部内壁面が軸方向に平準性を維持し得るようにし、当該密接部の内壁面側中空部に接合時の加熱による熱膨張により当該密接部内壁面に内接して押圧し得る内部支持体を挿入し、さらに当該密接部の外側にほぼ外接する軸孔を有する外部支持体を装着し、当該外部支持体を加熱することにより当該接合端面密接部および上記の内部支持体を加熱し、加熱によって膨張した内部支持体によって当該密接部を内面から押圧しつつ当該密接部分を溶着または融着させて管状体を接合することを特徴とする熱融着性管状体の接合方法。に存する。
【００１１】
【発明の実施の形態】
本願発明の接合方法は、一対の熱融着性管状体の接合方法であって、当該両管状体の接合用末端の端面を密接させ、当該密接部の内壁面側中空部に内部支持体を挿入し、さらに当該密接部の外側に外部支持体を装着し、当該外部支持体を加熱することにより当該接合用端面密接部および上記の内部支持体を加熱して管状体を接合することを特徴とする。
【００１２】
本願発明の接合方法に適用しうる管状体は実質的に熱融着性プラスチックスを主成分として構成された管状体であり、かかる熱融着性プラスチックスとしては、例えば、熱可塑性プラスチックスおよび熱溶融性フッ素樹脂が挙げられる。
【００１３】
上記の熱可塑性プラスチックスとしては、例えば、塩化ビニール樹脂、ポリエチレン樹脂、ポリプロピレン樹脂、ＡＢＳ樹脂、ポリエチレンテレフタレート樹脂、ポリブチレンテレフタレート樹脂、ポリアミド樹脂およびこれらのコポリマー、ポリマーアロイが挙げられ、両管状体は実質的に熱特性が実質的に同一の熱融着性プラスチックスから構成されるものであり、同一物質であるのが好ましい。
【００１４】
また、上記の熱溶融性フッ素樹脂としては、例えば、テトラフルオロエチレン・パーフルオロアルキルビニルエーテル共重合体（ＰＦＡ樹脂）、テトラフルオロエチレン・ヘキサフルオロプロピレン共重合体（ＦＥＰ樹脂）、ポリクロロトリフルオロエチレン（ＰＣＴＦＥ樹脂）、クロロトリフルオロエチレン・エチレン共重合体（ＥＣＴＦＥ樹脂）、ポリビニリデンフルオライド（ＰＶｄＦ樹脂）などが挙げられる。
【００１５】
上記の管状体の開口断面形状は、通常、円形であるが特に円形に限定されず、例えば、楕円形、三角形、四角形、五角形以上の多角形、さらに異形であってもよく、また、多角形の角部は丸みを持たせたものでもよい。また、これらの管状体の内径および外径は特に制限されないが、通常内径が０．２〜７６ｍｍ、外径は０．５〜８０ｍｍ程度である。
【００１６】
上記の管状体は通常チューブ又はパイプと呼ばれる全長が同じ形状のものであってもよいし、容器あるいは他の管状体などから突出した接合用管状部であってもよい。本発明において接合する両管状体の開口部は、開口形状が等しいものが使用され、開口形状および外周形状が共に同一であるものが好ましい。
【００１７】
前記の両管状体は、その接合用末端の中空部開口形状が同一であり、且つ肉部が互いに密接し得る端面を有するものである。係るの端面は、例えば軸方向と垂直な平面であってもよいが、軸方向成分を含む立体構造面を有するものが好ましく、例えば、肉部の端面形状が図１に示した様な共通軸方向に対する傾斜角がそれぞれ互いに補角である斜面形状であるもの、図２に示したような一方の端部肉部の外周側を円錐台状に先細り形状とし、他方の端部の内周面側を上記先端の外周半径と同じ半径で内部を同心円状に切削し、前者の先端を後者の切削された先端開口部を押し広げるように挿入して垂直面部分を突き合わせるもの、あるいは図３に示したような一部を軸方向に薄く加工して軸方向に平行な面で重ね合わせたものが挙げられる。さらに、図４に示したような肉厚部がＶ形突起とＶ形溝との嵌合関係となる形状のものも適用することができる。
【００１８】
上記の斜面の鋭角側の傾斜角度は、通常４５゜以下、好ましくは３０゜以下とされる。４５°を超える場合は傾斜面を形成することにより形成される接合面の延長効果が十分でなく、接合部強度の向上の効果が少ない。また、上記傾斜角によりにより先端にＶ形嘴部が生じる場合は、その傾斜角は、通常１５°以上とするのが好ましい。１５°未満の場合は嘴部の末端が薄くなり過ぎて相手方表面との密接性が不安定である。
【００１９】
前記の一部が軸方向に水平な面での重ね合わせ関係となる形状の場合の重ね合わせ部分の長さは、通常、管状体の肉厚の１．４倍以上程度が好ましく、かつ、薄く加工された肉厚の１０倍程度以下とするのが好ましい。肉厚の１．４倍未満では接合面の長さが十分でなく、薄く加工された肉厚の１０倍を超えると接合面が不安定に成りやすい。
【００２０】
前記の密接部の内壁面側中空部に挿入される内部支持体としては、接合時の加熱による熱膨張により密接部内壁面に内接して内壁面側から押圧し得る形状および寸法のチューブまたはストランドが使用される。かかる内部支持体を構成する材料としては、熱膨張係数が熱融着性管状体の素材より大きく且つ溶融した管状体素材と離型性を有する物質が使用される。なお、前記の内部支持体の素材が前記の熱融着性管状体と、特に加熱時に、管状体と離型性が不十分である場合は、上記の熱融着性管状体と融着または溶着しない特性を有する塗料または薄膜により適宜表面を被覆することにより避けることが出来る。係る内部支持体を構成する素材としては、フッ素ゴム、ＥＰＤＭ（エチレン−プロピレンターポリマー）、ＮＢＲ（アクリロニトリル−ブタジエン系ゴム）、シリコーンゴム等のエラストマー類が好適に例示される。上記の内部支持体の長さは、両管状体密接部分の長さを考慮して決定され、通常３０〜５０ｍｍ程度であるが、これより長くてもよい。
【００２１】
上記のエラストマー類は離型性と適度の柔軟性があり、熱膨張時の応力が柔軟であるため、ＰＦＡチューブ表面を過度な力で押圧することが無く、その結果、接合体の接合部内壁面は滑らかで適度な肉厚を保つことが出来る。さらに、内部支持体が上記のエラストマー類のチューブまたはストランドのように柔軟性があるため、接合される熱融着性管状体が湾曲している場合にも容易に挿入し、或いは取り出すことが出来る。
【００２２】
前記の密接部分の外側に装着される外部支持体は、通常、鉄、ステンレススティール、銅、アルミニウムなどの金属により構成され、接合の対象である管状体の当該密接部分をカバーする外側位置でほぼ外接しうる形状と内径の軸孔を持つように構成される。必要により２つ以上の割り形状にすることができる。
【００２３】
また、上記の外部支持体の外径寸法は、特に限定されず、例えば、全体として肉厚が５〜８ｍｍの円管状であってもよいし、あるいは外径が３０ｍｍ以上の円盤状であってもよい。また、上記の外部支持体の軸方向の長さ、すなわち上記の外部支持体の長さ或いは円盤の厚さは、両管状体密接部分の長さを十分カバーするように決定され、通常３０〜５０ｍｍ程度であるが、通常前記の内部支持体の長さと等しくされる。
【００２４】
また、上記の外部支持体の肉厚部には、加熱温度を制御するための熱電対などの温度検知素子を埋め込むことが好ましい。さらに、上記の外部支持体の肉厚部内に加熱素子を埋め込むことによって加熱機能を付加する事もできるが、加熱機能は別に外部支持体の外側を取り囲む形状の加熱装置として使用することが出来る。
【００２５】
上記の加熱装置は、特に限定されるものではないが、通常、鉄、ステンレススティール、銅、アルミニウムなどの金属により構成され、中心部に上記の外部支持体の外周面にほぼ内接する形状と内径の貫通孔を持つように形成される。上記の加熱装置の形状は、必要により２つ割り形状にすることができる。また、その外径寸法は、特に限定されず、例えば、５０〜１００ｍｍの円周面或いは多角形面でもよく、また、その厚さすなわち軸方向の長さも特に制限されないが、通常１５〜３０ｍｍであり、全体として円盤状であってもよい。
【００２６】
加熱素子を上記の外部支持体または加熱装置に組み込む場合は、外部支持体または加熱装置の円周方向の加熱温度がほぼ均一になるように複数個例えば３個以上の素子を埋め込むのが好ましい。また、上記の加熱素子に供給される電流を上記の温度検知素子と接合した温度調節装置により自動調節出来るように構成するのがより好ましい。
【００２７】
前記の熱融着性管状体の接合方法は、上記の両管状体の接合用末端端面を密接させて密接部内壁面が軸方向に平準性を維持し得るようにし、当該密接部の内壁面側中空部に前記の内部支持体を挿入し、さらに前記の外部支持体を加熱することにより当該接合用端面密接部および上記の内部支持体を加熱し、加熱によって膨張した内部支持体によって当該密接部を内面から押圧しつつ当該密接部分を溶着または融着させて管状体を接合する。
【００２８】
上記の両管状体の端面を突き合わせる際、密接面が端面構造が軸方向成分を含む場合は、密接時の軸方向の押し圧力は小さく抑制することが出来る。この理由は、内部支持体が熱膨張して密接部を中心側から外周側に向かって押圧して密接面が押圧されるから、接合面に対する軸方向の圧力は軽度に抑えても密接面は十分密接しても十分密着して接合される。その結果接合部の軸方向の圧力が小さいことから肉部プラスチックスの厚み方向への盛り上がりが少なく、接合部内壁面は段差および凹凸が小さい平準面とすることが出来る。
【００２９】
上記の両管状体を加熱する温度は、両熱融着性管状体の接合端面密接部分が溶着または融着し得る温度であり、かかる温度は両熱融着性管状体の素材により調節されるが、例えば素材がＰＦＡ樹脂の場合は３００〜３５０℃である。なお、上記の接合方法において密接部内壁面中空部に挿入された内部支持体は、接合が終了して冷却後に、外径が縮小した状態で容易に取り出される。
【００３０】
【実施例】
以下、本発明を実施例により更に詳細に説明するが、本発明は、以下の実施例に限定されるものではない。
なお、本実施例において、各特性の測定方法は以下の方法に依った。
【００３１】
（１）段差（ｍｍ）
管状体接合体試料の接合部を含む長さ５０ｍｍ部分を採り、軸方向に二つ割りにし、その内面側表面を上向きにして水平に置き、その表面の幅のほぼ中心部にサーフコーダー（表面粗さ測定器）の触針を当てて接合部を含む範囲を軸方向に摺動して得られたチャートにおいて、接合部両側の管状体内壁面に対応する基準線に対して接合部に相当する山部へ登る勾配または谷に下る勾配が、チャートの倍率を考慮して１５°以上に相当する場合を接合部の段差有りと判定し、その基準線からの山部の高さまたは谷の深さを以って段差の値とした。上記の勾配が基準線に対して１５°未満の場合は段差では無いものとした。
【００３２】
（２）引っ張り強さ（単位、ＭＰａ）
段差を測定した二つ割り試料から、接合部を掴み間のほぼ中央部に含むように掴み間距離２２．５ｍｍ、測定部幅４．５ｍｍのダンベル型となるように試験片を裁断して採り、テンシロン（引張試験機名）を用い、ＡＳＴＭ試験法により測定した。
【００３３】
実施例１
接合対象の管状体として、長さ５０ｍｍ、内径１６ｍｍ、外径１９ｍｍ、熱膨張率が２×１０−４／℃のＰＦＡ製チューブ２本を使用した。接合のために、一方の管状体の接合用端面肉部を図１に示す様に内壁面側が１７．８゜の鋭角と成る斜面（斜面の長さが４．９ｍｍ）となるように汎用旋盤により研削し、他方の管状体は接合のために端面の肉厚部を外壁面側が１６２．２゜の鈍角となる斜面（斜面の長さが４．９ｍｍ）となるように研削した。両端面を両管状体の軸を合わせて密接させ、全体の肉厚部の厚さが均一となるように突き合わせて密接させた。
【００３４】
上記の管状体密接部中空内部に、長さが４５ｍｍ、外径が１５．９ｍｍ、内径が１０ｍｍ、Ｈｓが７０、熱膨張係数が２．５×１０−４／℃のフッ素ゴムのチューブを、上記の密接部分をカバーするように挿入し、同様に、上記の密接部分をカバーするように、長さ４５ｍｍ、外径３０ｍｍ、内径１９．９ｍｍのステンレス製の外部支持体（加熱用金型）を装着し、全体として図５のように配置した。この加熱用金型には肉厚部に温度検知素子の熱電対が埋め込まれているものを使用した。
【００３５】
上記の外部支持体（加熱用金型）の外側に、内径３０ｍｍ、外径１２６ｍｍ、厚さ２０ｍｍの円盤状で、その外周面から等間隔に内部に向かって１２０Ｗ（消費電力率）のカートリッジヒーターが８個埋め込まれた加熱装置を装着し、上記の熱電対およびヒーター端子を接続した制御盤により調節して、上記の管状体密接部を室温２０℃から３５０℃に上昇させ昇温時間を含めて１０分間加熱し続け、その後放冷した。この間、内部に挿入した内部支持体は加熱により外径が膨張して前記管状体の密接部の内壁面側を押圧した。
【００３６】
放冷後、接合された上記の接合体から加熱装置、外部支持体を取り外し、内部支持体を取り出した後、接合部を含む部分の内壁面の段差および接合部分を含む試験片の長さ方向の引っ張り強さを測定し、その測定結果を主な接合条件と共に表１に示した。
【００３７】
実施例２
実施例１において、接合対象の管状体として、長さ５０ｍｍ、内径１６ｍｍ、外径１９ｍｍ、熱膨張率が２×１０−４／℃のＰＦＡ製チューブ２本を使用した。その一方の管状体について、図２に示す様にその接合端面から距離５ｍｍの位置の外周部から端面の外径より内径側に向かって０．５ｍｍ内側（外径１８ｍｍに相当）の円周位置に向かって先細り形状となるように円錐台状に切削した。他方の管状体については、端面側から５ｍｍ長に亘って外側肉厚０．５ｍｍ部分を残して内面側肉厚１．０ｍｍ部分を同心円状に切削した。
【００３８】
上記の先端部を斜面に切削した側の管状体の先端を他方の管状体の先端が内側に同心円状に切削して肉厚が０．５ｍｍとなっている管状体の肉薄部分内部に内径を押し広げながら押し込んで垂直端面を突き合わせた後、外部支持体として内径が２０．９ｍｍのものを使用した他は、実施例１と同様にして接合し、接合部を含む部分の内壁面の段差および接合部分を含む試験片の長さ方向の引っ張り強さを測定し、その測定結果を主な接合条件と共に表１に示した。
【００３９】
実施例３
実施例１において、一方の管状体の接合のための面の肉部を図３に示す様に肉部の接合用端面から長さ５ｍｍ部分の外周面側半分０．７５ｍｍ厚さ部分を同心円状に切削し、他方を肉厚部の接合用端面から５ｍｍ長さ部分の内周面側半分０．７５ｍｍ厚さ部分を同心円状に切削し、両管状体の接合すべき端部を、軸を合わせて全体の肉厚部の厚さが均一となるように切削部分を密接して重ね合わせ、端面を突き合わせたこと以外は実施例１と同様にして接合し、接合部を含む部分の内壁面の段差および接合部分を含む試料の長さ方向の引っ張り強さを測定し、その測定結果を主な接合条件と共に表１に示した。
【００４０】
実施例４
実施例１において、同じ規格の２本の管状体の接合端面を共に軸方向と垂直な平面になるように切削し、接合時両端面において突き合わせて押圧状態にしたこと以外は実施例１と同様にして接合し、次いで接合部を含む部分の内壁面の段差および接合部分を含む試験片の長さ方向の引っ張り強さを評価し、その結果を主な接合条件と共に表１に示した。
【００４１】
比較例１
実施例１において、同じ規格の２本の管状体の接合端面を共に軸方向と垂直な平面になるように切削し、接合時両端面において突き合わせて押圧状態にし、且つ内部支持体を使用しなかったこと以外は実施例１と同様にして接合し、次いで接合部を含む部分の内壁面の段差および接合部分を含む試験片の長さ方向の引っ張り強さを測定し、その結果を主な接合条件と共に表１に示した。
【００４２】
参考例
実施例１において使用したものと同じＰＦＡチューブについて接合処理しないものについて実施例１の場合と同様にして試験片の長さ方向の引っ張り強さを測定し、測定結果を表１に示した。
【００４３】
【表１】

Figure 2004243657
【００４４】
【発明の効果】以上、説明した本発明によれば、管状体の接合の際、密接部内壁面側中空部に、接合時の加熱による熱膨張により当該密接部内壁面に内接して押圧し得るエラストマーで構成された内部支持体を挿入し、さらに当該密接部の外側にほぼ外接する軸孔を有する外部支持体を装着し、当該外部支持体を加熱することにより当該接合端面密接部および上記の内部支持体を加熱し、上記加熱した加熱によって膨張した内部支持体によって当該密接部を内面から押圧しつつ当該密接部分を溶着または融着させて管状体を接合することにより、操作が簡便で且つ接合部内壁面の平準性が優れ、特に、接合面が互いに軸方向成分を含む立体構造面によって肉部が密接しうる端面を有する場合は平準性が優れると共にさらに接合強度が優れた、熱融着性管状体の接合方法を提供することが出来、従って、本発明の工業的価値は大きい。
【図面の簡単な説明】
【図１】本発明の実施例１で使用した両接合端面の肉厚部構造の組合せの概念説明図である。
【図２】本発明の実施例２で使用した両接合端面の肉厚部構造の組合せの概念説明図である。
【図３】本発明の実施例３で使用した両接合端面の肉厚部構造の組合せの概念説明図である。
【図４】両接合端面の肉厚部構造の組合せがＶ形突起とＶ形溝との嵌合関係の組合せの概念説明図である。
【図５】本発明の実施例１で行った接合方法の構成の縦断面の概念説明図である。
【符号の説明】
１１ 一方の管状体肉厚部の端部
１２ 他方の管状体肉厚部の端部
２１ 一方の管状体肉厚部の端部
２２ 他方の管状体肉厚部の端部
３１ 一方の管状体肉厚部の端部
３２ 他方の管状体肉厚部の端部
４１ 一方の管状体肉厚部の端部
４２ 他方の管状体肉厚部の端部
５１ 加熱体
５２ 外部支持体
５３ 一方の管状体肉厚部の端部
５４ 他方の管状体肉厚部の端部
５５ 内部支持体
５６ 中心軸線
５７ 内部中空部[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a method for joining a heat-fusible tubular body, and more particularly, to a simple method for joining a heat-fusible tubular body having a flat inner surface with no steps and excellent joining strength.
[0002]
[Prior art]
Conventionally, the joining of a plastic pipe for transferring a high-purity liquid such as pure water is performed at an end surface perpendicular to the axial direction, for example, in order to prevent a step at the joined portion that causes the liquid to stay, and to prevent the formation of irregularities. The inner space of the pipes to be joined together can be expanded mechanically or by an expandable inner peripheral surface support device using a pressure medium such as pressurized air (for example, see Patent Document 1) or a pressure medium. A bag-shaped inner peripheral support device made of a heat-resistant elastomer (see, for example, Patent Document 2) is disposed, and the inner wall surface of each joint is pressed. There is known a method of forming a smooth inner wall surface by removing a weld bead from a joint inner surface in a welding area by removing the weld bead from a member internal space.
[0003]
Alternatively, two pipes are arranged at positions where end faces perpendicular to the axial direction face each other, and the inside of the opposed pipes has an outer diameter substantially equal to the inner diameter of the pipe at high temperature. After storing the shape, a core made of a shape memory alloy that is deformed to have a smaller diameter than the inner diameter of the tube at a low temperature is arranged, and both ends of the tube are heated and melted, and at the same time, the core is melted. There is known a method in which the end faces of the pipes are returned to a memorized shape by heating, and the end faces are butted and welded while being pressed from the inside of the joint face of the tubular body (for example, see Patent Document 3).
[0004]
Furthermore, as a method of not using a jig inside the pipe at the joint portion, the inner wall side wall portion of the pipe end wall portion of both pipes that are abutted with each other is formed on a slope such that the pipe wall projects in the pipe axis direction. To form a triangular space, butted the two protruding ends of the tube, press both ends of the tube in opposite directions, heat them to the melting temperature and fuse them together. There is known a joining method of a plastic pipe for smoothing the inner surface side by moving only in the above triangular space (for example, see Patent Document 4).
[0005]
[Patent Document 1]
JP-A-01-110127 [Patent Document 2]
Japanese Patent Application Laid-Open No. 03-009335 [Patent Document 3]
JP 05-104632 A [Patent Document 4]
Japanese Patent Application Laid-Open No. 02-266191
[Problems to be solved by the invention]
However, the structure and operation of the supporting device or the core made of a shape memory alloy to be mounted on the inner surface side of the pipe joint used in the joining methods described in Patent Documents 1, 1 and 2 are complicated. . Furthermore, in the joining methods described in Patent Documents 1 to 3, the joining surfaces are all perpendicular to the axial direction, and both ends need to be pressed against each other in the axial direction during joining.
[0007]
For this reason, the pressing force is concentrated on the joining surface where the resin of the tubular body melts, so that the thickness tends to bulge at the joining surface, and even when the above-described internal support is used together, the thickness unevenness at the joining portion tends to increase only. However, since the joint is made only in the area corresponding to the wall thickness of the pipe, the joint area is small and the joint strength is not sufficient. In addition, since the joining method described in Patent Document 4 does not use a jig inside the pipe of the joining portion, it is inevitable to bend or protrude to the inner surface side, so that a step is generated in the joining portion or the inside of the joining portion is generated. The flatness or levelness (uniformity of the inner diameter) of the wall surface becomes insufficient.
[0008]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a heat-fusible tubular body excellent in levelness and bonding strength of a bonding portion inner surface, and a bonding method in which the operation thereof is easy. is there.
[0009]
[Means for Solving the Problems]
The present inventor has conducted various studies to achieve the above object.As a result, the two joint surfaces were brought into close contact with each other while maintaining the level of the inner wall surface of the joint portion of the tube, and the joint was heated to a hollow portion in the joint portion of the tube. It has been found that the above-mentioned object can be achieved by heating and joining by inserting an internal support that can be inscribed and pressed against the inner wall surface of the tightly closed portion of the tube due to thermal expansion due to heat expansion, and reached the present invention. Things.
[0010]
That is, the gist of the present invention is a method for joining a pair of heat-fusible tubular bodies, wherein the joining ends of the two tubular bodies have the same opening shape and an end face whose meat portion can be in close contact with each other. The inner wall surface of the closely-contacted portion can be maintained in the axial direction by bringing the both end surfaces into close contact, and the inner wall surface side of the closely-contacted portion is inscribed in the inner wall surface of the closely-contacted portion by thermal expansion due to heating during joining. A pressable internal support is inserted, an external support having a shaft hole substantially circumscribing the outside of the close portion is mounted, and the external support is heated to thereby form a close contact between the joint end face and the internal support. A heat-fusible tubular body joined by heating the body and welding or fusing the closely-contacted portion while pressing the closely-contacted portion from the inner surface by an internal support expanded by heating; Method. Exists.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
The joining method of the present invention is a joining method of a pair of heat-fusible tubular bodies, in which end faces of joining ends of the two tubular bodies are brought into close contact with each other, and an inner support is provided in an inner wall side hollow portion of the close contact portion. Inserting, further attaching an external support to the outside of the close contact portion, heating the external support, heating the joining end face close contact portion and the internal support, and joining the tubular body. And
[0012]
The tubular body applicable to the joining method of the present invention is a tubular body substantially composed mainly of heat-fusible plastics. As such heat-fusible plastics, for example, thermoplastic plastics and A hot-melt fluororesin is exemplified.
[0013]
Examples of the above thermoplastics include, for example, vinyl chloride resin, polyethylene resin, polypropylene resin, ABS resin, polyethylene terephthalate resin, polybutylene terephthalate resin, polyamide resin and copolymers thereof, and polymer alloys. It is made of heat-fusible plastics having substantially the same thermal characteristics and is preferably made of the same material.
[0014]
Examples of the heat-fusible fluororesin include, for example, tetrafluoroethylene / perfluoroalkylvinyl ether copolymer (PFA resin), tetrafluoroethylene / hexafluoropropylene copolymer (FEP resin), and polychlorotrifluoroethylene. (PCTFE resin), chlorotrifluoroethylene / ethylene copolymer (ECTFE resin), polyvinylidene fluoride (PVdF resin) and the like.
[0015]
The opening cross-sectional shape of the above-mentioned tubular body is usually circular, but is not particularly limited to a circular shape.For example, an elliptical shape, a triangular shape, a rectangular shape, a polygonal shape of pentagon or more, and a polygonal shape may also be used. May be rounded. The inner and outer diameters of these tubular bodies are not particularly limited, but usually the inner diameter is about 0.2 to 76 mm and the outer diameter is about 0.5 to 80 mm.
[0016]
The above-mentioned tubular body may be a tube or pipe having the same overall length, or may be a joining tubular portion projecting from a container or another tubular body. In the present invention, the opening portions of both tubular bodies to be joined have the same opening shape, and preferably have the same opening shape and the same outer peripheral shape.
[0017]
The two tubular bodies have the same hollow opening shape at the joining end, and have end faces whose meat portions can be in close contact with each other. The end face may be, for example, a plane perpendicular to the axial direction, but preferably has a three-dimensional structure including an axial component. For example, the end face of the meat portion has a common axis as shown in FIG. The slanted shape in which the inclination angles with respect to the directions are complementary to each other, the outer peripheral side of one end portion is tapered into a truncated cone shape as shown in FIG. 2, and the inner peripheral surface of the other end portion The inside is cut concentrically with the same radius as the outer peripheral radius of the above-mentioned tip, and the former tip is inserted so as to push open the cut tip opening of the latter, and butted against a vertical surface portion, or FIG. (1) are thinned in the axial direction and overlapped on a plane parallel to the axial direction. Further, a shape in which the thick portion has a fitting relationship between the V-shaped protrusion and the V-shaped groove as shown in FIG. 4 can also be applied.
[0018]
The inclination angle on the acute angle side of the above-mentioned slope is usually 45 ° or less, preferably 30 ° or less. If it exceeds 45 °, the effect of extending the joining surface formed by forming the inclined surface is not sufficient, and the effect of improving the strength of the joining portion is small. In the case where a V-shaped beak is formed at the tip due to the above-mentioned inclination angle, the inclination angle is usually preferably 15 ° or more. If the angle is less than 15 °, the end of the beak becomes too thin and the close contact with the counterpart surface is unstable.
[0019]
The length of the overlapped portion in the case where the above-mentioned part has a shape that is overlapped on a plane parallel to the axial direction is usually preferably about 1.4 times or more the wall thickness of the tubular body, and is thin. The thickness is preferably about 10 times or less the processed thickness. If the thickness is less than 1.4 times, the length of the joining surface is not sufficient, and if it exceeds 10 times the thinly processed thickness, the joining surface tends to be unstable.
[0020]
As the internal support inserted into the hollow portion on the inner wall surface side of the close portion, a tube or strand having a shape and dimensions capable of being inscribed in the close portion inner wall surface and being pressed from the inner wall surface side by thermal expansion due to heating during joining is used. used. As a material constituting such an internal support, a substance having a larger coefficient of thermal expansion than the material of the heat-fusible tubular body and having releasability from the molten tubular body material is used. In addition, when the material of the internal support is the heat-fusible tubular body, particularly when heated, if the releasability from the tubular body is insufficient, the above-mentioned heat-fusible tubular body is fused or fused. This can be avoided by appropriately coating the surface with a paint or a thin film having the property of not welding. As a material constituting such an internal support, elastomers such as fluorine rubber, EPDM (ethylene-propylene terpolymer), NBR (acrylonitrile-butadiene rubber), and silicone rubber are preferably exemplified. The length of the inner support is determined in consideration of the length of the portion where both tubular bodies are in close contact with each other, and is usually about 30 to 50 mm, but may be longer.
[0021]
The above elastomers have releasability and moderate flexibility, and the stress at the time of thermal expansion is flexible, so that the surface of the PFA tube is not pressed by excessive force, and as a result, the inner wall surface of the joined body of the joined body Can maintain a smooth and moderate thickness. Further, since the inner support is flexible like the above-mentioned elastomeric tube or strand, even if the heat-fusible tubular body to be joined is curved, it can be easily inserted or taken out. .
[0022]
The external support attached to the outside of the close portion is usually made of a metal such as iron, stainless steel, copper, or aluminum, and is almost at an outer position covering the close portion of the tubular body to be joined. It is configured to have a shaft hole with a shape that can circumscribe and an inner diameter. If necessary, two or more split shapes can be formed.
[0023]
The outer diameter of the outer support is not particularly limited. For example, the outer support may be in the form of a tube having a thickness of 5 to 8 mm as a whole, or a disk having an outer diameter of 30 mm or more. Is also good. In addition, the axial length of the external support, that is, the length of the external support or the thickness of the disc is determined so as to sufficiently cover the length of the portion where both tubular bodies are in close contact, and usually 30 to 30. It is about 50 mm, but usually equal to the length of the internal support.
[0024]
Further, it is preferable to embed a temperature detecting element such as a thermocouple for controlling a heating temperature in a thick portion of the external support. Furthermore, a heating function can be added by embedding a heating element in the thick portion of the external support, but the heating function can be used as a heating device having a shape surrounding the outside of the external support.
[0025]
Although the heating device is not particularly limited, it is usually made of metal such as iron, stainless steel, copper, and aluminum, and has a shape and an inner diameter substantially inscribed in the center at the outer peripheral surface of the external support. Is formed so as to have a through hole. The shape of the above heating device can be divided into two if necessary. The outer diameter is not particularly limited, and may be, for example, a circumferential surface or a polygonal surface of 50 to 100 mm, and the thickness, that is, the length in the axial direction is not particularly limited, but is usually 15 to 30 mm. Yes, it may be disk-shaped as a whole.
[0026]
When the heating element is incorporated in the external support or the heating device, it is preferable to embed a plurality of, for example, three or more elements so that the heating temperature in the circumferential direction of the external support or the heating device is substantially uniform. Further, it is more preferable that the current supplied to the heating element can be automatically adjusted by a temperature adjusting device joined to the temperature detecting element.
[0027]
The joining method of the heat-fusible tubular body is such that the joining end surfaces of the two tubular bodies are in close contact with each other so that the inner wall surface of the closely-contacted portion can maintain the levelness in the axial direction, and the inner wall surface side of the closely-contacted portion. The internal support is inserted into a hollow portion, and the external support is further heated to heat the joining end face close contact portion and the internal support, and the internal support expanded by heating to form the close contact portion. Is welded or fused to the tubular portion while pressing from the inner surface.
[0028]
When the end faces of the two tubular bodies are abutted with each other, if the close face has an end face structure including an axial component, the pressing force in the axial direction at the time of close contact can be suppressed to a small value. The reason for this is that the internal support thermally expands and presses the close contact portion from the center side toward the outer peripheral side to press the close contact surface. Even if they are in close contact, they are joined in close contact. As a result, since the pressure in the axial direction of the joint is small, there is little swelling in the thickness direction of the flesh plastics, and the inner wall surface of the joint can be a level surface with small steps and unevenness.
[0029]
The temperature at which the two tubular bodies are heated is a temperature at which the joint end faces of the two heat-fusible tubular bodies can be welded or fused, and the temperature is adjusted by the material of the two heat-fusible tubular bodies. However, for example, when the material is PFA resin, the temperature is 300 to 350 ° C. In addition, in the above joining method, the internal support inserted into the hollow portion on the inner wall surface of the close contact portion is easily taken out in a state where the outer diameter is reduced after the joining is completed and cooled.
[0030]
【Example】
Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to the following Examples.
In addition, in this example, the measuring method of each characteristic was based on the following method.
[0031]
(1) Step (mm)
A 50 mm length portion including the joint of the tubular body joint sample is taken, divided into two parts in the axial direction, placed horizontally with the inner surface thereof facing upward, and a surf coder (surface roughness) is provided substantially at the center of the width of the surface. In the chart obtained by sliding the range including the joint in the axial direction by applying the stylus of the measuring device), the peak corresponding to the joint with respect to the reference line corresponding to the tubular body wall surface on both sides of the joint If the slope that goes up to the slope or the slope that goes down to the valley is equal to or greater than 15 ° in consideration of the chart magnification, it is determined that there is a step at the joint, and the height of the peak or the depth of the valley from the reference line is determined. Thus, the value of the step was used. When the above gradient was less than 15 ° with respect to the reference line, it was determined that there was no step.
[0032]
(2) Tensile strength (unit, MPa)
The test piece was cut from a halved sample of which the step was measured so as to form a dumbbell type having a distance between grips of 22.5 mm and a measuring part width of 4.5 mm so as to include the joint almost at the center between the grips. (Tensile testing machine name) and measured by the ASTM test method.
[0033]
Example 1
Two PFA tubes having a length of 50 mm, an inner diameter of 16 mm, an outer diameter of 19 mm, and a coefficient of thermal expansion of 2 × 10 −4 / ° C. were used as the tubular bodies to be joined. For the joining, a general-purpose lathe such that the joining end face wall of one of the tubular bodies has a slope (the length of the slope is 4.9 mm) having an acute angle of 17.8 ° on the inner wall side as shown in FIG. The other tubular body was ground so that the thick part of the end face was formed into an inclined surface having an obtuse angle of 162.2 ° on the outer wall side (the length of the inclined surface was 4.9 mm) for joining. Both end surfaces were brought into close contact by aligning the axes of both tubular bodies, and were brought into close contact with each other so that the thickness of the entire thick portion became uniform.
[0034]
A tube of fluororubber having a length of 45 mm, an outer diameter of 15.9 mm, an inner diameter of 10 mm, Hs of 70, and a coefficient of thermal expansion of 2.5 × 10 −4 / ° C., A stainless steel external support (heating mold) having a length of 45 mm, an outer diameter of 30 mm, and an inner diameter of 19.9 mm is inserted so as to cover the above-mentioned close part, and to cover the above-mentioned close part. , And arranged as a whole as shown in FIG. As the heating mold, a mold in which a thermocouple of a temperature detecting element was embedded in a thick portion was used.
[0035]
A cartridge heater having a disk shape of 30 mm in inner diameter, 126 mm in outer diameter and 20 mm in thickness and 120 W (power consumption rate) inward at equal intervals from the outer peripheral surface on the outside of the external support (heating mold). A heating device embedded with 8 pieces was mounted, and the temperature was adjusted from a room temperature of 20 ° C. to a temperature of 20 ° C. to 350 ° C. by adjusting a control panel connected to the thermocouple and the heater terminal. For 10 minutes and then allowed to cool. During this time, the outer diameter of the internal support inserted into the inside expanded due to heating, and pressed against the inner wall surface of the closely contacting portion of the tubular body.
[0036]
After cooling, remove the heating device and the external support from the bonded body, remove the internal support, and remove the internal support. Was measured, and the measurement results are shown in Table 1 together with main joining conditions.
[0037]
Example 2
In Example 1, two tubes made of PFA having a length of 50 mm, an inner diameter of 16 mm, an outer diameter of 19 mm, and a coefficient of thermal expansion of 2 × 10 −4 / ° C. were used as the tubular bodies to be joined. As shown in FIG. 2, one of the tubular bodies has a circumferential position 0.5 mm inward (corresponding to an outer diameter of 18 mm) from the outer peripheral portion at a distance of 5 mm from the joint end surface toward the inner diameter side from the outer diameter of the end surface. And cut into a truncated cone so as to taper toward. With respect to the other tubular body, an inner wall thickness of 1.0 mm was cut concentrically over a length of 5 mm from the end face side except for an outer wall thickness of 0.5 mm.
[0038]
The tip of the tubular body on the side where the above-mentioned tip is cut into a slope is cut concentrically inward with the tip of the other tubular body and the inside diameter is reduced inside the thin portion of the tubular body having a thickness of 0.5 mm. After being pushed in while being spread, the vertical end faces were butted, and then joined in the same manner as in Example 1 except that an outer support having an inner diameter of 20.9 mm was used. The tensile strength in the longitudinal direction of the test piece including the joint was measured, and the measurement results are shown in Table 1 together with main joining conditions.
[0039]
Example 3
In the first embodiment, as shown in FIG. 3, a portion of the surface for joining one of the tubular bodies having a thickness of 0.75 mm from the joining end face of the portion of the thickness is 0.75 mm in a half of the outer peripheral surface side. And the other half is concentrically cut on the inner peripheral side half of the 5 mm length part from the end face for joining of the thick part with a thickness of 0.75 mm. Except that the cut portions were closely overlapped so that the thickness of the entire thick portion became uniform, and joined together in the same manner as in Example 1 except that the end surfaces were butted, the inner wall surface of the portion including the joined portion The tensile strength in the longitudinal direction of the sample including the step and the joint was measured, and the measurement results are shown in Table 1 together with main joining conditions.
[0040]
Example 4
In the same manner as in Example 1, except that the joining end faces of the two tubular bodies of the same standard were cut so as to be a plane perpendicular to the axial direction, and the both end faces were pressed against each other at the time of joining. Then, the step on the inner wall surface of the portion including the joint portion and the tensile strength in the longitudinal direction of the test piece including the joint portion were evaluated. The results are shown in Table 1 together with the main joining conditions.
[0041]
Comparative Example 1
In Example 1, the joining end faces of two tubular bodies of the same standard were cut so as to be both planes perpendicular to the axial direction, butted against both end faces at the time of joining to make a pressed state, and the internal support was not used. Joining was carried out in the same manner as in Example 1 except that the step on the inner wall surface of the portion including the joint and the tensile strength in the longitudinal direction of the test piece including the joined portion were measured. The conditions are shown in Table 1.
[0042]
Reference Example The same tensile strength as in Example 1 was measured for the same PFA tube as used in Example 1 but not subjected to bonding treatment, and the tensile strength in the longitudinal direction of the test piece was measured. .
[0043]
[Table 1]
Figure 2004243657
[0044]
According to the present invention as described above, the elastomer which can be inscribed and pressed against the inner wall surface of the close portion by the thermal expansion due to the heating at the time of joining when the tubular body is joined. Is inserted, and an external support having a shaft hole substantially circumscribing the outside is attached to the outside of the close contact portion, and the external support is heated to thereby join the close end face close contact portion and the inside of the inside. The operation is simple and easy by joining the tubular body by heating the support and welding or fusing the close contact portion while pressing the close contact portion from the inner surface by the internal support expanded by the heated heating. The inner wall surface is excellent in levelness, especially when the joint surface has an end face in which the meat part can be in close contact with each other by the three-dimensional structure surface including the axial component, and the joint strength is excellent and the joint strength is further excellent. Can provide a method for joining fusible tubular body, therefore, industrial value of the present invention is great.
[Brief description of the drawings]
FIG. 1 is a conceptual explanatory view of a combination of thick-walled structures of both joining end surfaces used in Embodiment 1 of the present invention.
FIG. 2 is a conceptual explanatory view of a combination of a thick-walled structure of both joining end surfaces used in a second embodiment of the present invention.
FIG. 3 is a conceptual explanatory view of a combination of a thick-walled structure of both joining end surfaces used in a third embodiment of the present invention.
FIG. 4 is a conceptual explanatory view of a combination of a thick portion structure of both joining end surfaces and a combination of a fitting relationship between a V-shaped projection and a V-shaped groove.
FIG. 5 is a conceptual explanatory view of a longitudinal section of a configuration of a bonding method performed in Example 1 of the present invention.
[Explanation of symbols]
11 End part of one tubular body thick part 12 End part of the other tubular body thick part 21 End part of one tubular body thick part 22 End part of the other tubular body thick part 31 One tubular body meat Thick end 32 End of other tubular thick part 41 End of one tubular thick part 42 End of other thick tubular part 51 Heating body 52 External support 53 One tubular body End portion 54 of the thick portion End portion 55 of the other tubular body thick portion Internal support 56 Center axis 57 Internal hollow portion

Claims (8)

一対の熱融着性管状体の接合方法であって、当該両管状体の接合用末端はその中空部開口形状が同一で且つ肉部が互いに密接しうる端面を有し、当該両端面を密接させて密接部内壁面が軸方向に平準性を維持し得るようにし、当該密接部の内壁面側中空部に接合時の加熱による熱膨張により当該密接部内壁面に内接して押圧し得る内部支持体を挿入し、さらに当該密接部の外側にほぼ外接する軸孔を有する外部支持体を装着し、当該外部支持体を加熱することにより当該接合用端面密接部および上記の内部支持体を加熱し、加熱によって膨張した内部支持体によって当該密接部を内面から押圧しつつ当該密接部分を溶着または融着させて管状体を接合することを特徴とする熱融着性管状体の接合方法。A method for joining a pair of heat-fusible tubular bodies, wherein the joining ends of the two tubular bodies have end faces that have the same hollow-portion opening shape and whose meat portions can be in close contact with each other. The inner wall surface of the closely-contacted portion can maintain the levelness in the axial direction, and the inner support body which can be inscribed and pressed against the inner wall surface of the closely-contacted portion by thermal expansion due to heating at the time of joining to the hollow portion on the inner wall surface side of the closely-contacted portion Insert, further attached an external support having a shaft hole almost circumscribed outside the close contact portion, heating the external support to heat the joining end face close contact portion and the internal support, A method of joining a heat-fusible tubular body, wherein the tubular part is joined by welding or fusing the closely-contacted portion while pressing the closely-contacted portion from the inner surface by an internal support expanded by heating. 一対の熱融着性管状体の接合方法であって、当該両管状体の接合用末端はその開口形状が同一で且つ肉部が互いに軸方向成分を含む立体構造面により密接しうる端面を有し、当該両端面を密接させて密接部内壁面が軸方向に平準性を維持し得るようにし、当該密接部の内壁面側中空部に接合時の加熱による熱膨張により当該密接部内壁面に内接して押圧し得る内部支持体を挿入し、さらに当該密接部の外側にほぼ外接する軸孔を有する外部支持体を装着し、当該外部支持体を加熱することにより当該接合用端面密接部および上記の内部支持体を加熱し、加熱によって膨張した内部支持体によって当該密接部を内面から押圧しつつ当該密接部分を溶着または融着させて管状体を接合することを特徴とする熱融着性管状体の接合方法。A method for joining a pair of heat-fusible tubular bodies, wherein the joining ends of the two tubular bodies have end faces that have the same opening shape and whose meat portions can be in closer contact with each other with a three-dimensional structure including axial components. Then, the both end surfaces are brought into close contact with each other so that the inner wall surface of the closely contact portion can maintain the levelness in the axial direction, and the inner wall surface side of the close contact portion is inscribed in the inner wall surface of the close contact portion by thermal expansion due to heating at the time of joining. Inserting the internal support which can be pressed by pressing, further mounting an external support having a shaft hole almost circumscribing the outside of the close contact portion, heating the external support, the joining end face close contact portion and the above A heat-fusible tubular body characterized in that the inner support is heated and the tubular body is joined by welding or fusing the close contact portion while pressing the close contact portion from the inner surface by the internal support expanded by heating. Joining method. 立体構造面が管状体の軸方向に対して斜面となる面を一つ又は二つ以上を含むことを特徴とする請求項２に記載の熱融着性管状体の接合方法。The method for joining a heat-fusible tubular body according to claim 2, wherein the three-dimensional structure surface includes one or more surfaces that are inclined with respect to the axial direction of the tubular body. 立体構造面の斜面が共通軸となす傾斜角のうち鋭角である側の傾斜角が４５°以下であることを特徴とする請求項３に記載の熱融着性管状体の接合方法。The method for joining heat-fusible tubular bodies according to claim 3, wherein the inclination angle of the acute angle side of the inclination angles formed by the slopes of the three-dimensional structure surface and the common axis is 45 ° or less. 立体構造面の斜面が共通軸となす傾斜角のうち鋭角である側の傾斜角が３０°以下であることを特徴とする請求項３に記載の熱融着性管状体の接合方法。The method for joining heat-fusible tubular bodies according to claim 3, wherein the inclination angle of the acute angle side of the inclination angles formed by the slopes of the three-dimensional structure surface and the common axis is 30 ° or less. 立体構造面が共通軸と平行である面を含むことを特徴とする請求項３に記載の熱融着性管状体の接合方法。The method according to claim 3, wherein the three-dimensional structure surface includes a surface parallel to the common axis. 熱融着性管状体の主成分がテトラフロオロエチレン・パーフルオロアルキルビニルエーテル、テトラフルオロエチレン・ヘキサフルオロプロピレン共重合体およびポリテトラフルオロエチレンからなる群から選ばれる１種または２種以上の混合物であることを特徴とする請求項１から６までの何れか１つに記載の熱融着性管状体の接合方法。The main component of the heat-fusible tubular body is one or a mixture of two or more selected from the group consisting of tetrafluoroethylene / perfluoroalkyl vinyl ether, tetrafluoroethylene / hexafluoropropylene copolymer and polytetrafluoroethylene. The method for joining a heat-fusible tubular body according to any one of claims 1 to 6, wherein: 内部支持体がフッ素ゴム、ＥＰＤＭ（エチレン−プロピレンターポリマー）、ＮＢＲ（アクリロニトリル−ブタジエン系ゴム）、シリコーンゴムから成る群から選ばれた素材で形成されていることを特徴とする請求項１から７までの何れか１つに記載の熱融着性管状体の接合方法The internal support is made of a material selected from the group consisting of fluororubber, EPDM (ethylene-propylene terpolymer), NBR (acrylonitrile-butadiene rubber), and silicone rubber. The method for joining a heat-fusible tubular body according to any one of the above
JP2003035991A 2003-02-14 2003-02-14 Method for joining heat-fusible tubular bodies Expired - Lifetime JP4106287B2 (en)

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JP2009209482A (en) * 2008-03-04 2009-09-17 Mitsubishi Rayon Co Ltd Method for producing continuous hollow strand
JP2011104822A (en) * 2009-11-13 2011-06-02 Nippon Futsuso Kogyo Kk Method of forming fluororesin coating film on inner peripheral surface of cylindrical pipe and cylindrical pipe having fluororesin coating film on inner peripheral surface obtained by the method
WO2012153668A1 (en) * 2011-05-10 2012-11-15 Canon Kabushiki Kaisha Fluidic device, chemical reaction system, and nucleic-acid analyzing system
JP2013193308A (en) * 2012-03-19 2013-09-30 Showa Marutsutsu Co Ltd Resin-made core
WO2015160201A1 (en) * 2014-04-16 2015-10-22 한남대학교 산학협력단 Method for connecting polyethylene pipe using butt joining heat fusion
JP6275921B1 (en) * 2016-08-23 2018-02-07 朝日インテック株式会社 Junction structure and catheter having the junction structure

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009209482A (en) * 2008-03-04 2009-09-17 Mitsubishi Rayon Co Ltd Method for producing continuous hollow strand
JP2011104822A (en) * 2009-11-13 2011-06-02 Nippon Futsuso Kogyo Kk Method of forming fluororesin coating film on inner peripheral surface of cylindrical pipe and cylindrical pipe having fluororesin coating film on inner peripheral surface obtained by the method
WO2012153668A1 (en) * 2011-05-10 2012-11-15 Canon Kabushiki Kaisha Fluidic device, chemical reaction system, and nucleic-acid analyzing system
JP2012237607A (en) * 2011-05-10 2012-12-06 Canon Inc Fluid device
JP2013193308A (en) * 2012-03-19 2013-09-30 Showa Marutsutsu Co Ltd Resin-made core
WO2015160201A1 (en) * 2014-04-16 2015-10-22 한남대학교 산학협력단 Method for connecting polyethylene pipe using butt joining heat fusion
KR20150119764A (en) * 2014-04-16 2015-10-26 한남대학교 산학협력단 Joining Method for Polyethylene Pipes Using Butt Fusion
KR101627908B1 (en) * 2014-04-16 2016-06-07 한남대학교 산학협력단 Joining Method for Polyethylene Pipes Using Butt Fusion
JP6275921B1 (en) * 2016-08-23 2018-02-07 朝日インテック株式会社 Junction structure and catheter having the junction structure

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