JP2699161B2 - 熱可塑性樹脂製品の融着方法 - Google Patents

熱可塑性樹脂製品の融着方法

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Publication number
JP2699161B2
JP2699161B2 JP7191105A JP19110595A JP2699161B2 JP 2699161 B2 JP2699161 B2 JP 2699161B2 JP 7191105 A JP7191105 A JP 7191105A JP 19110595 A JP19110595 A JP 19110595A JP 2699161 B2 JP2699161 B2 JP 2699161B2
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Japan
Prior art keywords
temperature
heating wire
fusion
resin
heat
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Expired - Fee Related
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JP7191105A
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English (en)
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JPH0911334A (ja
Inventor
谷 勝 熊
Original Assignee
東亜高級継手バルブ製造株式会社
有限会社イーエフテクノ
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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
    • 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
    • B29C66/5224—Joining tubular articles for forming fork-shaped connections, e.g. for making Y-shaped pieces
    • B29C66/52241—Joining tubular articles for forming fork-shaped connections, e.g. for making Y-shaped pieces with two right angles, e.g. for making T-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
    • 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"
    • B29C65/3468—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 means for supplying heat to said heated elements which remain in the join, e.g. special electrical connectors of 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
    • 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
    • B29C66/1222—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 lapped 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
    • B29C66/1224—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
    • B29C66/70—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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9141—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
    • B29C66/91411—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature of the parts to be joined, e.g. the joining process taking the temperature of the parts to be joined into account
    • 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9141—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
    • B29C66/91431—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature the temperature being kept constant over time
    • 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9161—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux
    • B29C66/91641—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux the heat or the thermal flux being non-constant over time
    • 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9161—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux
    • B29C66/91651—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux by controlling or regulating the heat generated by Joule heating or induction heating
    • B29C66/91653—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux by controlling or regulating the heat generated by Joule heating or induction heating by controlling or regulating the voltage, i.e. the electric potential difference or electric tension
    • 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9161—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux
    • B29C66/91651—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux by controlling or regulating the heat generated by Joule heating or induction heating
    • B29C66/91655—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux by controlling or regulating the heat generated by Joule heating or induction heating by controlling or regulating the current intensity
    • 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/96—Measuring or controlling the joining process characterised by the method for implementing the controlling of the joining process
    • B29C66/961—Measuring or controlling the joining process characterised by the method for implementing the controlling of the joining process involving a feedback loop mechanism, e.g. comparison with a desired value
    • 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/96—Measuring or controlling the joining process characterised by the method for implementing the controlling of the joining process
    • B29C66/967—Measuring or controlling the joining process characterised by the method for implementing the controlling of the joining process involving special data inputs or special data outputs, e.g. for monitoring purposes
    • B29C66/9672—Measuring or controlling the joining process characterised by the method for implementing the controlling of the joining process involving special data inputs or special data outputs, e.g. for monitoring purposes involving special data inputs, e.g. involving barcodes, RFID tags

Landscapes

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

Description

【発明の詳細な説明】
【０００１】
【産業上の利用分野】本発明は、相対向する熱可塑性樹
脂の一方に埋め込まれた抵抗発熱素子に電力を供給し、
樹脂を加熱溶融させる熱可塑性樹脂製品の融着方法に関
する。
【０００２】
【従来の技術】上下水道やガスの配管に用いられるポリ
エチレン管（以下「ＰＥ管」という）とエレクトロフュ
ージョン継手（以下「ＥＦ継手」という）の融着が、Ｅ
Ｆ継手のＰＥ管との接合面に埋め込まれた電熱線に電力
を供給し、接合面の樹脂を加熱溶融させることによって
行われている。そして、電熱線への通電は定電圧または
定電流制御で、電熱線または樹脂の温度が溶融温度内に
なるように設定時間連続的に行われていた。
【０００３】
【発明が解決しようとする課題】しかし乍ら、従来の通
電（加熱）方法では、電熱線の配置並びに継手と管の間
の隙間により、電熱線の埋め込み範囲の軸方向中間部
で、しかも継手側の樹脂に熱が集中する傾向があり、さ
らに一度熱が一部分に集中すると温度特性によって、さ
らにその部分に熱が集中するため、全体的に融着品質の
低下を招く結果になっていた。
【０００４】本発明は、上記の熱の集中を防ぐことによ
り均一に樹脂を加熱し、融着品質を高めることを目的と
している。
【０００５】
【課題を解決するための手段】上記の目的を達成するた
めの本発明の熱可塑性樹脂製品の融着方法は、相対向す
る熱可塑性樹脂の一方に埋め込まれた抵抗発熱素子に電
力を供給し、樹脂を加熱溶融させる熱可塑性樹脂製品の
融着方法において、通電開始から抵抗発熱素子を樹脂の
溶融温度まで加熱した後、一旦通電を中断または供給電
力を著しく低下させて冷却期間を設けることである。
【０００６】
【作 用】通電開始（融着開始）から抵抗発熱素子の温
度が上昇し、樹脂の溶融温度になった時点で、通電が中
断または供給電力が著しく低下され、冷却期間に入る
と、抵抗発熱素子の温度上昇が止まり、冷却期間が経過
するまで抵抗発熱素子の温度は下がり続ける。冷却期間
までの通電で抵抗発熱素子の一部分に熱が集中するが、
その集中熱が冷却期間の間に抵抗発熱素子全体に伝わる
ため、抵抗発熱素子並びにその周辺の樹脂の熱分布が一
様になる。またこれに伴い相対向する樹脂が熱膨張する
ため、樹脂の間の隙間が少なくまたは無くなる。
【０００７】そして、前記冷却期間経過後、抵抗発熱素
子への通電を再開または供給電力を上昇させ、抵抗発熱
素子の温度が樹脂の溶融温度になるように定電圧または
定電流制御で連続的に設定時間制御することにより、相
対向する樹脂が加熱溶融され、融着されるもので、再加
熱時には抵抗発熱素子並びにその周辺の樹脂の熱分布が
一様で、しかも、相対向する樹脂の間の隙間が少なくま
たは無くなっているので、熱が一部分に集中するのを防
止でき、全体的に均一に加熱できるため、融着品質が高
くなる。
【０００８】
【実施例】以下本発明の実施例を図面に基づいて詳述す
る。図２はＥＦ継手とエレクトロフュージョンコントロ
ーラ（以下「ＥＦコントローラ」という）の外観図で、
図中（１）はＴ形のＥＦ継手で、ＰＥ管（２）の端部を
接合させる各受け口（３）の端面から一対のコネクタピ
ン（４）が突出している。また図中（５）はＥＦコント
ローラで、前記コネクタピン（４）に接続させるコネク
タ（６）を先端に有する制御コード（７）と、電源に接
続させる電源プラグ（８）を先端に有する電源コード
（９）と、スタートスイッチ（１０）及びリセットスイ
ッチ（１１）と、表示器（１２）を備えている。
【０００９】図３に示すように、ＥＦ継手（１）は各受
け口（３）ごとにＰＥ管（２）を融着接合できるよう
に、各受け口（３）の内周面に電熱線（１３）が埋め込
まれている。電熱線（１３）は抵抗発熱素子であるニッ
ケル線またはニッケル合金線をＥＦ継手（１）の成形材
料と同じポリエチレン樹脂で被覆した被覆線が用いられ
ており、受け口（３）の端面側に電熱線（１３）の両端
を出すように、電熱線（１３）は二つ折り状態で受け口
（３）の内周面にコイル状に埋め込まれ、両端がコネク
タピン（４）に接続されている。
【００１０】図４に示すように、ＥＦコントローラ
（５）はマイクロコンピュータで構成する自動融着制御
用のＣＰＵ（１４）を備え、そのＣＰＵ（１４）に前記
スタートスイッチ（１０）及びリセットスイッチ（１
１）と、前記表示器（１２）と、ヒートパターン設定手
段（１５）と、ヒートパターン記憶手段（１６）と、供
給電力調節手段（１７）と図示しない計時手段が接続さ
れている。
【００１１】ヒートパターン設定手段（１５）はＥＦ継
手（１）の種類をＣＰＵ（１４）に認識させるもので、
作業者が人為的にＥＦ継手（１）の種類を入力する方法
や、予めＥＦ継手（１）に与えられた種類ごとのバーコ
ードまたは抵抗値や時定数などをセンサを用いて読取る
方法などがある。
【００１２】ヒートパターン記憶手段（１６）はＲＯ
Ｍ、ＲＡＭから構成され、ＥＦ継手（１）の種類ごとの
供給電力値や通電時間や電熱線（１３）の電気特性など
自動融着制御に必要なデータが記憶される。
【００１３】供給電力調節手段（１７）はＥＦ継手
（１）への出力電圧（１９）を調節して定電流制御で供
給電力を調節する。
【００１４】ＣＰＵ（１４）はヒートパターン設定手段
（１５）からの入力信号に基づいてヒートパターン記憶
手段のデータを読込む初期制御を行い、スタートスイッ
チ（１０）のオン操作まで待機するもので、図１及び図
５に示すように、スタートスイッチ（１０）のオン操作
によって融着作業開始信号がＣＰＵ（１４）に付与され
ると、予め読込んだ電圧で電流が流され通電が開始され
る。この通電によって電熱線（１３）が加熱され温度が
予め読込んだ樹脂の溶融温度（ポリエチレンの場合は２
２０℃前後に設定される。）まで上昇すると、一旦通電
が予め設定された時間中断される。そして、通電が中断
される冷却期間を経過すると、再び初期電圧と同じ電圧
で電流が流され通電が再開され、電熱線（１３）の温度
を適正融着温度範囲内（ポリエチレンの場合は２００℃
〜３００℃位である）で、できるだけ高い温度に予め設
定された時間保つように電圧を調節する溶融制御を行
い、ＥＦ継手（１）側の融着界面とＰＥ管（２）側の融
着界面の樹脂を加熱溶融させる。そしてこの溶融制御の
終了をもって通電が停止される。
【００１５】上記の融着方法において、電熱線（１３）
の温度は電熱線（１３）の抵抗変動による温度算出で求
めることができる。
【００１６】尚上記の冷却期間は電圧を「０」にして通
電を中断しているが、電圧を初期電圧に比べ著しく低下
（初期電圧の半分以下）に低下させて供給電圧を著しく
低下させても設けることができる。
【００１７】図１の実線で示す温度線図は図３のＡ−Ａ
線断面部における電熱線中心温度と、ＥＦ継手（１）の
受口内面及びＰＥ管（２）の外面の温度、即ち融着界面
中央温度を示しており、電熱線（１３）の温度算出は最
大抵抗、即ち図３のＡ−Ａ線断面部における電熱線（１
３）温度を算出するもので、ＲＴ＝ＲＯ｛１＋（Ｔ−２
３）×α｝の式で求められる。ＲＴ＝最大抵抗、ＲＯ＝
初期抵抗、α＝抵抗温度係数、Ｔ＝電熱線温度、であ
る。ここで初期抵抗ＲＯは通電開始時（融着開始時）に
微小電圧で電熱線（１３）に電流を流し通電することに
よって検出され、この検出後に電熱線（１３）への通電
が予め設定された初期電圧で行われる。最大抵抗ＲＴ及
び抵抗温度係数αは既知の値であり融着制御データとし
て記憶されている。電熱線（１３）は抵抗温度係数が１
０００×１０-6／Ｋ以上で、体積抵抗率０．１／μΩｍ
以下のニッケル線またはニッケル合金線が、温度算出す
る上で精度に秀れ好ましい。
【００１８】また図１の破線で示す温度線図は図３のＢ
−Ｂ線断面部における電熱線端部温度と、ＥＦ継手
（１）の受口内面及びＰＥ管（２）の外面の温度、即ち
融着界面周辺温度を示しており、図１から明らかなよう
に、通電開始（融着開始）から電熱線（１３）の中心温
度が樹脂の溶融温度まで加熱されても、電熱線（１３）
の端部温度は樹脂の溶融温度まで加熱されない。これは
電熱線（１３）の中心部より端部の方が比熱が大きいた
めで、このまま通電を続けると電熱線（１３）の中心と
端部の温度が拡大する。即ち電熱線（１３）の中心部に
熱が集中する。これは温度が高い箇所ほど抵抗が上がる
ためである。このような一部への熱の集中を防ぐために
電熱線（１３）の温度が樹脂の溶融温度になったとき一
旦通電を設定時間中断して冷却期間を設けている。この
冷却期間の間に電熱線（１３）の温度は全体的に低下す
ると共に、電熱線（１３）の中心部の高温部から端部の
低温度へ熱の伝達が行われ、電熱線（１３）全体の温度
を均一にする。即ち熱分布が均一になる。そして熱分布
が均一になった状態から通電を再開することにより、電
熱線（１３）の中心部と端部の温度を略一致させた状態
で適正融着温度範囲内に加熱及び保持することができ、
溶融層を管軸方向及び半径方向（ＥＦ継手側及びＰＥ管
側）に均一発達させることができ、品質の高い融着を行
うことができる。
【００１９】また、ＥＦ継手（１）及びＰＥ管（２）の
融着界面温度も電熱線（１３）に近づこうとして電熱線
温度の昇降に略比例して昇降するため、上記した電熱線
（１３）と同時に冷却期間後は融着界面中央部と周辺部
で温度差がほとんどなく加熱されている。
【００２０】さらに、ＥＦ継手（１）とＰＥ管（２）の
間の隙間（Ｌ）が無い場合にはＥＦ継手（１）側の融着
界面温度とＰＥ管（２）側の融着界面温度は略一致する
が、ほとんどの場合には隙間（Ｌ）が存在し、また大径
管になるほどその隙間（Ｌ）が大きくなる。この隙間
（Ｌ）（空気層）はＰＥ管（２）側への熱伝達を妨げる
だけでなく、ＥＦ継手（１）の樹脂及び電熱線（１３）
の温度上昇を引き起こす。即ち電熱線（１３）の中心部
及びその近傍のＥＦ継手（１）側の樹脂をさらに高温に
し、熱の集中を招く原因になっているが、冷却期間まで
の初期加熱によってＥＦ継手（１）及びＰＥ管（２）の
樹脂を熱膨張させ、冷却期間の間にその熱膨張が融着界
面全体で均一化されて再加熱の際には前記隙間（Ｌ）が
ほとんど無くなるため、この隙間（Ｌ）による熱の集中
も防ぎ、品質の高い融着を行うことができる。
【００２１】
【発明の効果】本発明は以上のように構成され、以下の
ような効果を奏する。
【００２２】相対向する熱可塑性樹脂の一方に埋め込ま
れた抵抗発熱素子に電力を供給し、樹脂を加熱溶融させ
る熱可塑性樹脂製品の融着方法において、通電開始から
抵抗発熱素子を樹脂の溶融温度まで加熱した後、一旦通
電を中断または供給電力を著しく低下させて冷却期間を
設けたので、電熱線などの抵抗発熱素子及び樹脂の熱分
布を一様にすることができ、再加熱時の熱の集中を防
ぎ、均一に樹脂を加熱し熱可塑性樹脂の融着品質を高め
ることができる。
【図面の簡単な説明】
【図１】本発明の融着方法における温度及び出力線図。
【図２】本発明の実施例を示すＥＦ継手とＥＦコントロ
ーラの外観図。
【図３】ＥＦ継手の断面図。
【図４】自動融着制御のブロック図。
【図５】自動融着制御のフローチャート。
【符号の説明】
（１） ＥＦ継手（熱可塑性樹脂製品） （２） ＰＥ管（熱可塑性樹脂製品） （１３） 電熱線（抵抗発熱素子）

Claims (1)

    (57)【特許請求の範囲】
  1. 【請求項１】 相対向する熱可塑性樹脂の一方に埋め込
    まれた抵抗発熱素子に電力を供給し、樹脂を加熱溶融さ
    せる熱可塑性樹脂製品の融着方法において、通電開始か
    ら抵抗発熱素子を樹脂の溶融温度まで加熱した後、一旦
    通電を中断または供給電力を著しく低下させて冷却期間
    を設けることを特徴とする熱可塑性樹脂製品の融着方
    法。
JP7191105A 1995-07-03 1995-07-03 熱可塑性樹脂製品の融着方法 Expired - Fee Related JP2699161B2 (ja)

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JPH0911334A JPH0911334A (ja) 1997-01-14
JP2699161B2 true JP2699161B2 (ja) 1998-01-19

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