JP3265405B2 - 電気融着継手の製造方法 - Google Patents

電気融着継手の製造方法

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Publication number
JP3265405B2
JP3265405B2 JP27180492A JP27180492A JP3265405B2 JP 3265405 B2 JP3265405 B2 JP 3265405B2 JP 27180492 A JP27180492 A JP 27180492A JP 27180492 A JP27180492 A JP 27180492A JP 3265405 B2 JP3265405 B2 JP 3265405B2
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JP
Japan
Prior art keywords
sleeve
joint
joints
heating
manufacturing
Prior art date
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Expired - Fee Related
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JP27180492A
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English (en)
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JPH06123393A (ja
Inventor
喜廣 岸田
Original Assignee
東亜高級継手バルブ製造株式会社
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Priority to JP27180492A priority Critical patent/JP3265405B2/ja
Priority to CN93103052A priority patent/CN1096246A/zh
Publication of JPH06123393A publication Critical patent/JPH06123393A/ja
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Publication of JP3265405B2 publication Critical patent/JP3265405B2/ja
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D23/00—Producing tubular articles
    • B29D23/001—Pipes; Pipe joints
    • B29D23/003—Pipe joints, e.g. straight joints
    • B29D23/005—Pipe joints, e.g. straight joints provided with electrical wiring
    • 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
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/3404—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the type of heated elements which remain in the joint
    • B29C65/342—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the type of heated elements which remain in the joint comprising at least a single wire, e.g. in the form of a winding
    • B29C65/3432—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the type of heated elements which remain in the joint comprising at least a single wire, e.g. in the form of a winding comprising several wires, e.g. in the form of several independent windings
    • 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
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/3472—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the composition of the heated elements which remain in the joint
    • B29C65/3476—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the composition of the heated elements which remain in the joint being metallic
    • B29C65/348—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the composition of the heated elements which remain in the joint being metallic with a polymer coating
    • 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
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/36—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
    • B29C65/3604—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the type of elements heated by induction which remain in the joint
    • B29C65/362—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the type of elements heated by induction which remain in the joint comprising at least a single wire, e.g. in the form of a winding
    • B29C65/3632—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the type of elements heated by induction which remain in the joint comprising at least a single wire, e.g. in the form of a winding comprising several wires, e.g. in the form of several independent windings
    • 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
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/36—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
    • B29C65/3672—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the composition of the elements heated by induction which remain in the joint
    • B29C65/3676—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the composition of the elements heated by induction which remain in the joint being metallic
    • B29C65/368—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the composition of the elements heated by induction which remain in the joint being metallic with a polymer coating
    • 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
    • B29C66/50—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
    • B29C66/5223—Joining tubular articles for forming corner connections or elbows, e.g. for making V-shaped pieces
    • B29C66/52231—Joining tubular articles for forming corner connections or elbows, e.g. for making V-shaped pieces with a right angle, e.g. for making L-shaped pieces
    • 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
    • B29C66/52291—Joining tubular articles involving the use of a socket said socket comprising a stop
    • B29C66/52292—Joining tubular articles involving the use of a socket said socket comprising a stop said stop being internal
    • 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
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/36—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
    • B29C65/3672—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the composition of the elements heated by induction which remain in the joint
    • B29C65/3684—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the composition of the elements heated by induction which remain in the joint being non-metallic
    • B29C65/3696—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the composition of the elements heated by induction which remain in the joint being non-metallic with a coating
    • 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

Landscapes

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

Description

【発明の詳細な説明】
【０００１】
【産業上の利用分野】この発明は、熱可塑性高分子材料
製管類を接続する電気融着継手の製造方法に関する。
【０００２】
【従来の技術】高分子材料、特に熱可塑性の樹脂または
ゴムからなる管類、継手類または弁栓類等を、漏洩など
が起こらないように接続して、円滑な配管施工を可能に
するためには、それぞれの接続部を密に封じる必要があ
る。ところが、たとえば、ＡＢＳ樹脂、ポリ塩化ビニ
ル、ポリスチレンなどの限られた高分子材料に対しては
それぞれに適した接着剤が開発されていて、それらを接
続部に適宜塗布して硬化させれば、容易に目的を果たす
ことができるが、ポリオレフィン、ポリアミド、ポリア
セタール、フッ素含有樹脂など多くのものに対しては適
当な接着剤は未だ得られていない。そこで、このような
接着剤のない高分子材料に対しては、接続する部分を外
熱法（火炎または管状炉など）によって硬化もしくは溶
融させて冷却しない間に一気に接合させ、冷却固化させ
る方法が採られている。しかし、このような外熱方法で
は均一に加熱することおよび適当な軟化もしくは溶融の
状態に調整維持することがきわめて難しく、良い結果が
得られない。
【０００３】そこで、例えば特願平１−１０６８９号に
おいて、互に接触することなく平行して螺旋（らせん）
状に巻き上げられた線状発熱体が、中空の筒状体に成形
された熱可塑性高分子材料層の中に封入された状態にあ
るジョイント用スリーブが開示されている。しかし、こ
のジョイント用スリーブを使用する場合に、ジョイント
部にスリーブを挿入して、管類を接続し、その状態を維
持しながら通電して融着させた後冷却固化させることな
どに複雑な操作と長い時間が必要であるなどの欠点があ
る。
【０００４】そこで、例えば、特願平２−２７９３号に
開示されているように、被覆発熱線状体コイルを予め継
手内に一体成形したり、或は特願平２−１８８８２１号
に開示されているように被覆発熱線状体コイルで形成し
たスリーブを継手類と一体成形しておくことが提案され
ている。
【０００５】
【発明の課題】しかしながら、上記のようなコイル又は
スリーブをインサート成形するのは、技術的に非常に難
しく、コスト高で、精度の高い製品を得ることが困難で
ある。
【０００６】そこで、この発明の課題は、極めて簡単な
工程で高精度の電気融着継手を得ることができる製造方
法を提供することである。
【０００７】
【課題の解決手段】上記の課題を解決するため、この発
明においては、被覆線状発熱体コイルによって形成する
スリーブを、射出成形した直後の継手類の内部に挿入し
て継手類の冷却固化によって継手類にスリーブを一体化
すると共に、スリーブには隣接する発熱体の被覆材同志
を融着させる被覆融着部と、外端部外周に形成するカラ
ーを、また継手類内周面にカラーに対応する周溝を設け
た方法を採用したものである。
【０００８】
【作用】継手類を射出成形して型から取り出した直後に
は、いまだ完全に固化されておらず、この継手類の内部
にスリーブを挿入した後、完全に冷却させると継手類が
収縮するため、スリーブが圧縮保持されるもので、継手
類にスリーブ挿入時にはスリーブの適正姿勢を保って確
実に挿入して、継手類とスリーブとの正確且つ確実な一
体化を図るものである。
【０００９】
【実施例】以下、この発明の実施例を添付図面に基づい
て説明する。
【００１０】まで、スリーブの形成方法について説明す
る。
【００１１】図１に示すように、マンドレルＭに被覆線
状発熱体１を二つ折りにして巻き付ける。
【００１２】内蔵される発熱線２はたとえばニクロム
線、炭素繊維のように通電すれば発熱する性質を有する
素材からなる線状のものであり、また、このような発熱
線２を被覆する熱可塑性高分子材料被覆材は接続しよう
とする管類の材質と同系のもの、または親和性の大きい
ものが望ましい。具体的には、ＡＢＳ樹脂、ポリ塩化ビ
ニル、ポリスチレン、ポリオレフィン、ポリアミド、ポ
リアセタール、フッ素樹脂などを例示することができ
る。そして、これら被覆材に内蔵される発熱線の本数は
特に限定するものではないが、１本または２本が実用的
である。しかし、１本の発熱線を内蔵する被覆線状体を
単独で螺旋に巻くと、その端子は螺旋コイルの両端に位
置することになり、接続しようとする管類の外部に一端
を取り出させても、他の端を同じように外部に取り出す
ことは容易ではないという問題点がある。したがって、
１本の発熱線を内蔵する被覆線状体であっても、それを
図１のように二つ折りに曲げるか、または別個の被覆線
状体を２本平行かつ密着させて（両被覆線状体の発熱線
の一端同志を接続する必要はあるが）螺旋状に巻けば、
二つの端子を同じ方向に取り出すことは可能となる。こ
れに対して、２本の発熱線２が予め内蔵されている被覆
線状体であれば、図２に示すように、被覆線状体１の一
端を露呈する２本の発熱線２を適宜結線するのみで、よ
り簡単な操作によって両端子を螺旋コイルの同じ場所に
取り出すことができるので好都合である。いずれにして
も被覆材層の厚み、螺旋の径などは、配管施工の際に対
象となる管類の寸法、形状等に応じて、線状発熱体１の
寸法などと共に適宜選定すればよく、特に限定されるも
のではない。ただ、螺旋状に巻かれた被覆線状体の被覆
が加熱されて、被覆材が軟化溶融したときでも隣接して
いる線状発熱体同志が移動して接触したり交差したりし
ないように一定の間隙を維持できるためには、特に２本
の発熱線を内蔵する被覆線状体の場合には、丸形より平
形とすることが望ましい。
【００１３】次に、図１に示す螺旋コイルＣの一端の発
熱線２に通電すると、熱可塑性高分子材料から成る被覆
が溶融して、隣接する線状体１が互に接合され、螺旋コ
イルＣは一体のスリーブＳとなる。
【００１４】或は被覆材の融点以上（たとえば被覆材が
ポリエチレンの場合１５０℃程度）に別途加熱された熱
器具（従来プラスチックの溶接に用いられる熱風溶接、
熱棒、熱刃もしくは熱板溶接、インパルス溶接、高周波
溶接、超音波溶接などいずれの溶接方法であってもよい
が、最も簡便で設備費も少なくて好ましいのは内熱式若
しくは外熱式の熱板である。）を螺旋コイルの周方向の
少なくとも１箇所に接触させて図２及び図３に示すよう
に、被覆融着部３を設けるとスリーブＳが得られる。螺
旋コイルの表面に熱器具が触れると被覆材は直ちに溶融
し、隣接する被覆材同志がその部分で融着し、熱器具が
遠のくと直ちに冷却して固化する。したがって、前記の
被覆線状体全体を通電によって加熱溶融しさらに冷却す
る技術と比較すれば溶融したり冷却したりする樹脂量は
きわめて少ないので、被覆融着部３の形成に要する時間
を非常に短縮することができる。
【００１５】このようにしてスリーブＳを用意してお
き、管継手を射出成形する。管継手の形状は、例えば図
４又は図５に示すもののほかに、Ｔ字形、十字形等いず
れでもよい。材質も前記のような熱可塑性高分子材料か
ら適宜選択すればよい。
【００１６】管継手Ａを成形した直後に、予め用意した
スリーブＳを継手内に挿入する。このとき、継手の収縮
率を考慮に入れて、予め継手の内径に対するスリーブの
外径を定めておくのは勿論のことである。
【００１７】スリーブを挿入後、継手Ａが冷却固化する
まで放置する。期間は３日程度である。
【００１８】なお、図示のように、スリーブＳの外端部
外周に予めカラー４を形成しておき、継手Ａの内周面に
前記カラー４に対応する周溝４ａを形成しておくのが好
ましい。
【００１９】出来上がった継手Ａ内には、スリーブＳが
しっかりと保持され、ガタが全くなく取り扱い中に脱落
することもなかった。
【００２０】
【効果】この発明によれば、以上のように、射出成形直
後の管継手内に線状発熱体コイルから成るスリーブを挿
入することによって電気融着継手を形成したので、イン
サート成形のような複雑な装置を必要とせず、極めて簡
単な操作で線状発熱体を内蔵した管継手を製造すること
ができ、しかも得られた製品は高精度でかつ堅牢である
等の利点を有するもので、特に継手類に対するスリーブ
の挿入時には被覆融着部によってスリーブ形状を崩すこ
となく適正に保ち、また挿入後はカラーと周溝との嵌合
によってガタなく確実にスリーブを継手類内に保持し、
取扱い中のスリーブの脱落なども防止してこの製造精度
を一層向上させることができる。
【図面の簡単な説明】
【図１】この発明の管継手の製造に用いるスリーブの作
製方法を示す側面図
【図２】同上の他の作製方法を示す側面図
【図３】同上のスリーブの正面図
【図４】管継手の製造方法を示す一部縦断側面図
【図５】同上の他の例を示す一部縦断側面図
【符号の説明】
１ 被覆線状発熱体 ２ 発熱線 ３ 融着部 ４ カラー ４ａ 周溝 Ａ 管継手 Ｃ 螺旋コイル Ｍ マンドレル Ｓ スリーブ

Claims (1)

    (57)【特許請求の範囲】
  1. 【請求項１】 被覆線状発熱体コイルによって形成する
    スリーブを、射出成形した直後の継手類の内部に挿入し
    て継手類の冷却固化によって継手類にスリーブを一体化
    すると共に、スリーブには隣接する発熱体の被覆材同志
    を融着させる被覆融着部と、外端部外周に形成するカラ
    ーを、また継手類内周面にカラーに対応する周溝を設け
    たことを特徴とする電気融着継手の製造方法。
JP27180492A 1992-10-09 1992-10-09 電気融着継手の製造方法 Expired - Fee Related JP3265405B2 (ja)

Priority Applications (2)

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JP27180492A JP3265405B2 (ja) 1992-10-09 1992-10-09 電気融着継手の製造方法
CN93103052A CN1096246A (zh) 1992-10-09 1993-03-26 制造电热熔结管接头的方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP27180492A JP3265405B2 (ja) 1992-10-09 1992-10-09 電気融着継手の製造方法

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JP3265405B2 true JP3265405B2 (ja) 2002-03-11

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DE102011054502B4 (de) * 2011-08-19 2015-11-19 Friatec Aktiengesellschaft Montagesystem zum Verschweißen von rohrförmigen Kunststoffbauteilen
CN102364197A (zh) * 2011-11-18 2012-02-29 王崇高 压入式塑料管接头
CN105135133B (zh) * 2015-08-20 2017-08-29 张家港昌达实业有限公司 一种二维缠绕布线器及利用其进行的布线方法
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JPH06123393A (ja) 1994-05-06

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