JPH05329934A - 熱可塑性樹脂管の接合方法 - Google Patents

熱可塑性樹脂管の接合方法

Info

Publication number
JPH05329934A
JPH05329934A JP4144271A JP14427192A JPH05329934A JP H05329934 A JPH05329934 A JP H05329934A JP 4144271 A JP4144271 A JP 4144271A JP 14427192 A JP14427192 A JP 14427192A JP H05329934 A JPH05329934 A JP H05329934A
Authority
JP
Japan
Prior art keywords
thermoplastic resin
hot air
pipe
pipes
joining
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.)
Pending
Application number
JP4144271A
Other languages
English (en)
Inventor
Osamu Sato
佐藤　　修
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sekisui Chemical Co Ltd
Original Assignee
Sekisui Chemical Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sekisui Chemical Co Ltd filed Critical Sekisui Chemical Co Ltd
Priority to JP4144271A priority Critical patent/JPH05329934A/ja
Publication of JPH05329934A publication Critical patent/JPH05329934A/ja
Pending legal-status Critical Current

Links

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
    • 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
    • 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
    • B29C65/10—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using hot gases (e.g. combustion gases) or flames coming in contact with at least one of the parts to be joined
    • B29C65/103—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using hot gases (e.g. combustion gases) or flames coming in contact with at least one of the parts to be joined direct heating both surfaces 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
    • B29C66/01—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
    • B29C66/32—Measures for keeping the burr form under control; Avoiding burr formation; Shaping the burr
    • B29C66/324—Avoiding burr formation
    • B29C66/3242—Avoiding burr formation on the inside of a tubular or hollow article
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—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
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • 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
    • B29C66/70—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
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/737—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined
    • B29C66/7377—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined amorphous, semi-crystalline or crystalline
    • B29C66/73771—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined amorphous, semi-crystalline or crystalline the to-be-joined area of at least one of the parts to be joined being amorphous
    • B29C66/73772—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined amorphous, semi-crystalline or crystalline the to-be-joined area of at least one of the parts to be joined being amorphous the to-be-joined areas of both parts to be joined being amorphous
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/737—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined
    • B29C66/7377—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined amorphous, semi-crystalline or crystalline
    • B29C66/73775—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined amorphous, semi-crystalline or crystalline the to-be-joined area of at least one of the parts to be joined being crystalline
    • B29C66/73776—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined amorphous, semi-crystalline or crystalline the to-be-joined area of at least one of the parts to be joined being crystalline the to-be-joined areas of both parts to be joined being crystalline

Landscapes

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

Abstract

(57)【要約】 【目的】 合成樹脂管の突き合わせ接合において、管端
部加熱時に加熱体に溶融樹脂が付着するのを防止すると
ともに、接合部の溶融状態のバラツキをなくして一定し
た接合品質を得、且つ接合部内面にビードが発生するの
を防止する。 【構成】 管の内径とほぼ同じ外径を有する内面支持体
１を熱可塑性樹脂管Ｐ1，Ｐ2 の対向する端部内面に挿
入し、管端部を離隔して支持しながら熱風供給リング３
の内周面に穿設された多数の熱風噴出口４から熱風を噴
出して管端部を加熱溶融した後、両管端部を突き合わせ
て融着する。

Description

【発明の詳細な説明】
【産業上の利用分野】本発明は、熱可塑性樹脂管同士も
しくは熱可塑性樹脂管と管継手をバット接合（突き合わ
せ接合）する方法に関する。
【０００１】
【従来の技術】水道管、排水管、ガス管等の流体輸送管
として、ポリエチレン、ポリプロピレン、ポリ弗化ビニ
リデン、ポリエーテルエーテルケトン、ポリフェニレン
サルファイド等の熱可塑性樹脂製の管が多く使用されて
いる。このような熱可塑性樹脂管同士もしくは熱可塑性
樹脂管と熱可塑性樹脂製管継手（以下被接合体と称す
る）を接合する方法としては、被接合体の端部を加熱溶
融した後、溶融した両端部を突き合わせて融着するバッ
ト接合（突き合わせ接合）が広く実施されている。
【０００２】上記バット接合を行う場合、被接合体の端
部を加熱する方法としては、従来より、端部を加熱体に
接触させて伝導で加熱する方法、特開平１−１１０１２
７号公報に示されるように加熱体から離して輻射で加熱
する方法等が一般的に行われている。
【０００３】
【発明が解決しようとする課題】前者の場合には、溶融
樹脂が加熱体に付着するのを防止するため、加熱体はそ
の表面に四弗化エチレン（ＰＴＦＥ）等非粘着性の高い
弗素系の樹脂によるコーティングを施したものが用いら
れる。しかし、ポリエーテルエーテルケトン、ポリフェ
ニレンサルファイド等のような高耐熱性の熱可塑性樹脂
管を接合する場合、これら高耐熱性熱可塑性樹脂の溶融
温度が四弗化エチレン樹脂の溶融温度よりも高いために
適切な表面コーティング材がない。また、止むなく四弗
化エチレンコーティングを施した加熱体を用いると、溶
融樹脂が付着して接合作業が困難となったり、付着樹脂
が熱分解して分解物が接合部に巻き込まれ、接合強度を
低下させることがある。
【０００４】また、端部が加熱体に押し当てられること
によって溶融樹脂が接合部内面にはみ出して内面ビード
ができ、流体の滞留、流体中の固形物の引っ掛かり、細
菌の生息・増殖等の原因となることがある。
【０００５】また、後者の場合には、被加熱面の受熱量
は距離の二乗に反比例するために、管端部と加熱体との
距離が少し異なっても管端部の溶融状態はかなり大きく
異なってくる。また、通常には大気中で加熱が行われる
ので、外気温度や気流による影響を受けて更に溶融状態
がばらつき、その結果所期の接合強度が得られないこと
がある。
【０００６】本発明は上記のような従来技術の問題点に
鑑みてなされたものであって、被接合体の突き合わせ接
合を行う場合、加熱体に溶融樹脂が付着するのを防止す
るとともに、安定した溶融状態で接合することによって
接合の品質を高め、更に、接合部の内面にビードが発生
するのを防止することを目的とする。
【０００７】
【課題を解決するための手段】上記の目的を達成するた
めに、本発明の熱可塑性樹脂管の接合方法は、２本の熱
可塑性樹脂管同士もしくは熱可塑性樹脂管と熱可塑性樹
脂製管継手とを突き合わせて融着する熱可塑性樹脂管の
接合方法において、熱可塑性樹脂管同士もしくは熱可塑
性樹脂管と熱可塑性樹脂製管継手が対向する端部内面に
熱可塑性樹脂管の内径とほぼ同じ外径を有する内面支持
体を挿入し、両端部を離隔して支持しながら熱風を吹き
付けて加熱溶融した後突き合わせて融着し、次いで内面
支持体を抜去することを要旨とするものである。
【０００８】本発明において用いられる熱可塑性樹脂管
及び熱可塑性樹脂管継手の材料としては、ポリ塩化ビニ
ル、ポリエチレン、ポリプロピレン、ＡＢＳ等の汎用熱
可塑性樹脂、ポリエーテルエーテルケトン、ポリフェニ
レンサルファイド、ポリサルフォン、ポリエーテルサル
フォン、ポリエチレンテレフタレート、ポリ弗化ビニリ
デン等の結晶性または非晶性の熱可塑性エンジニアリン
グ樹脂、及び上記の樹脂に充填材等を添加した複合材や
ポリマーアロイ等が挙げられる。なお、管継手の材料
は、接合時の相溶性及び物性上の均質性等の点から、熱
可塑性樹脂管と同じ樹脂であることが好ましい。
【０００９】本発明に用いられる内面支持体は、金属製
のもの、もしくは少なくとも熱可塑性樹脂の溶融温度よ
り若干高い温度に長時間耐え得る耐熱性、融着時に突き
合わせ部の内面に侵入しようとする溶融樹脂圧によって
変形しない強度及び硬度等を有し、且つ溶融樹脂との離
型性（非粘着性）が良好な、例えば弗素ゴム、シリコン
ゴム等の弾性材料よりなるものが好ましい。
【００１０】金属製の内面支持体は、熱可塑性樹脂管の
内径とほぼ同じ外径を有するものとし、被接合体内面と
の摩擦抵抗が小さく、且つ、溶融樹脂が付着し難いよう
に、その外周面に硬質クロム等のメッキ、弗素系樹脂コ
ーティング等を施したものが好適である。
【００１１】また、弗素ゴム、シリコンゴム等の弾性材
料よりなるものは、外径を金属製のものより更に小さ
く、且つ中実乃至厚肉のものに形成し、被接合体の内面
に挿入後、軸方向に押圧するかあるいは軸方向に開口す
る貫通孔に剛性材料よりなる芯体を挿入する等の方法で
拡径し、外周面を被接合体の端部内面に密接させて加熱
溶融及び接合を行い、接合終了後、縮径復元して抜去す
るようにしたものが好適である。
【００１２】本発明において、被接合体の両端部を離隔
支持する距離は、熱可塑性樹脂の種類、管の肉厚、熱風
の温度、風速等によって異なるが、管の肉厚の０．５〜
３倍程度が好適である。
【００１３】また、被接合体の端部に熱風を吹き付ける
方法としては、環状の熱風供給リングの内周に開口する
丸孔状、スリット状等の熱風噴出口から熱風を被接合体
の端部に直接吹き付けるもの、被接合体の対向する端部
間に露出している内面支持体の外周面に当てて噴出し、
反射させて端部に吹き付けるもの等が挙げられる。
【００１４】
【作用】被接合体端部を加熱する場合、端部が加熱体に
直接接触しないので、加熱体に溶融樹脂が付着すること
がない。
【００１５】また、風速を持った熱風を吹き付けて加熱
するので、輻射による加熱のように加熱体と被加熱体
（被被接合体端部）との距離の差の影響を敏感に受ける
ことがない上、外気温や風の影響も受け難く、加熱条件
が一定し、従って安定した溶融状態が得られやすい。な
お、被接合体の端部が離隔されているので、融着される
端面に熱風が直接当たり、迅速に加熱が行われる。
【００１６】また、被接合体の端部には、熱可塑性樹脂
管の内径とほぼ同じ外径を有する内面支持体が挿入され
ているので、端部を加熱溶融する際及び溶融した両端部
を突き合わせて融着する際、溶融樹脂が融着部内面に侵
入するのが阻止され、従って内面ビードの発生が防止さ
れる。なお、両端部を突き合わせて融着する際、内面支
持体がガイドの役目を果たすので芯狂いが少なく、融着
操作が容易となる。
【００１７】
【実施例】以下、本発明を、２本の熱可塑性樹脂管を接
合する場合の実施例につき、図面を参照して説明する。
図１乃至図３は本発明の実施例を示す説明図であって、
図１は熱可塑性樹脂管の管端部を加熱溶融している状
態、図２は溶融した熱可塑性樹脂管の管端部を突き合わ
せて融着している状態を示す断面図、図３は熱風供給リ
ングの正面図である。
【００１８】図１に示されるように、熱可塑性樹脂管Ｐ
1 ，Ｐ2 の対向する両管端部内面には、熱可塑性樹脂管
Ｐ1 ，Ｐ2 の内径より僅かに小さい外径を有し、外周面
に硬質クロムメッキが施された内面支持体１が、これに
取着された支持杆２によって導かれて挿入されており、
内面支持体１は両管端部を管の肉厚と概ね同じ距離だけ
離隔した状態で支持している。
【００１９】熱可塑性樹脂管Ｐ1 ，Ｐ2 の離隔された管
端部に露出する内面支持体１を囲繞して、図３に示され
るような環状の熱風供給リング３が配置されている。そ
して熱風供給リング３の内周面には丸孔状の熱風噴出口
４が等間隔に多数穿設されている。なお、熱風供給リン
グ３は、接合作業時の設置と撤去が簡単に行えるよう
に、リング半体３１，３２に分割され、図には示されて
いないが蝶番、掛金で組立て解体が容易に行える構造と
されているとともに、熱風をできるだけ均一に供給でき
るように、複数箇所（図３では４箇所）の熱風供給口５
が設けられている。
【００２０】熱風供給源（図には示されていない）から
熱風を供給すると、熱風は熱風供給口５を通って熱風供
給リング３中に平均に供給され、更に熱風噴出口４から
内面支持体１の外周面に向けて平均に噴出され、内面支
持体１の外周面に当たって直角方向に曲げられ、両管端
部に吹き付けられてこれを加熱し溶融させる。加熱は管
端部と熱風供給リング３が接触することなく行われ、且
つ、熱風吹き付けによって行われるので、熱風噴出口４
の先端と内面支持体１の外周面との距離の若干のバラツ
キ、外気温や風の影響等を受けることがなく、安定した
溶融状態が得られる。
【００２１】管端部が溶融されると、図２に示されるよ
うに熱風供給リング３を撤去し、熱可塑性樹脂管Ｐ1 ，
Ｐ2 を把持している移動式管クランプ装置６を前進さ
せ、溶融状態の管端部同士を突き合わせて融着する。融
着終了後融着部を冷却し、しかる後支持杆２を引いて内
面支持体１を合成樹脂管Ｐ1 の外に抜き出して接合が終
了する。
【００２２】上記の実施例では金属製の内面支持体を使
用し、その外径は熱可塑性樹脂管の内径より僅かに小さ
い寸法とし、外周面には硬質クロムメッキを施してある
ので熱可塑性樹脂管との摩擦抵抗が小さく、内面支持体
の管内面への挿入及び抜き出しを容易に行うことができ
る。
【００２３】また、熱可塑性樹脂管の内面と内面支持体
の外周面との間の隙間は僅かであり、管端部を加熱溶融
する際及び管端部同士を突き合わせて融着する際、溶融
樹脂は管内面にほとんど侵入することがなく、内面ビー
ドの発生が防止される。
【００２４】
【発明の効果】以上の説明から明らかなように、本発明
の熱可塑性樹脂管の接合方法によれば、接合部の管端部
を加熱溶融する際、管端部を加熱体に接触させないの
で、加熱体に溶融樹脂が付着して接合作業が困難となっ
たり、付着樹脂が熱分解して分解物が接合部に巻き込ま
れ、接合強度を低下させることこともなく、安定した接
合作業が可能となる。
【００２５】また、熱風噴出口の先端と内面支持体の外
周面との距離の若干のバラツキ、外気温や風等によって
加熱条件が変動を受けることが少なく、安定した溶融状
態が得られ、接合の品質が向上する。
【００２６】更に、接合部の内面への溶融樹脂の侵入が
妨げられるので、内面にはほとんどビードができること
がなく、従って流体の滞留、流体中の固形物の引っ掛か
り、細菌の生息や増殖等が発生することがない。
【００２７】
【図面の簡単な説明】
【図１】本発明実施例において管端部を加熱溶融してい
る状態を示す断面図である。
【図２】本発明実施例において管端部を融着している状
態を示す断面図である。
【図３】本発明実施例に用いられる熱風供給リングの正
面図である。
【符号の説明】
１ 内面支持体 ２ 支持杆 ３ 熱風供給リング ４ 熱風噴出口 ５ 熱風供給口 ６ 移動式管クランプ装置 Ｐ1 ，Ｐ2 熱可塑性樹脂管

Claims (1)

    【特許請求の範囲】
  1. 【請求項１】 ２本の熱可塑性樹脂管同士もしくは熱可
    塑性樹脂管と熱可塑性樹脂製管継手とを突き合わせて融
    着する熱可塑性樹脂管の接合方法において、熱可塑性樹
    脂管同士もしくは熱可塑性樹脂管と熱可塑性樹脂製管継
    手が対向する端部内面に熱可塑性樹脂管の内径とほぼ同
    じ外径を有する内面支持体を挿入し、両端部を離隔して
    支持しながら熱風を吹き付けて加熱溶融した後突き合わ
    せて融着し、次いで内面支持体を抜去することを特徴と
    する、熱可塑性樹脂管の接合方法。
JP4144271A 1992-06-04 1992-06-04 熱可塑性樹脂管の接合方法 Pending JPH05329934A (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4144271A JPH05329934A (ja) 1992-06-04 1992-06-04 熱可塑性樹脂管の接合方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4144271A JPH05329934A (ja) 1992-06-04 1992-06-04 熱可塑性樹脂管の接合方法

Publications (1)

Publication Number Publication Date
JPH05329934A true JPH05329934A (ja) 1993-12-14

Family

ID=15358212

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4144271A Pending JPH05329934A (ja) 1992-06-04 1992-06-04 熱可塑性樹脂管の接合方法

Country Status (1)

Country Link
JP (1) JPH05329934A (ja)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109968683A (zh) * 2017-12-28 2019-07-05 上海宝冶集团有限公司 热塑性塑料热熔连接翻边控制装置及其使用方法
CN111331854A (zh) * 2020-03-24 2020-06-26 湖南天卓管业有限公司 一种hdpe双壁波纹管热熔衔接装置

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109968683A (zh) * 2017-12-28 2019-07-05 上海宝冶集团有限公司 热塑性塑料热熔连接翻边控制装置及其使用方法
CN109968683B (zh) * 2017-12-28 2024-08-20 上海宝冶集团有限公司 热塑性塑料热熔连接翻边控制装置及其使用方法
CN111331854A (zh) * 2020-03-24 2020-06-26 湖南天卓管业有限公司 一种hdpe双壁波纹管热熔衔接装置

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