JPH0752259A - 熱可塑性プラスチック管の電気融着方法 - Google Patents

熱可塑性プラスチック管の電気融着方法

Info

Publication number
JPH0752259A
JPH0752259A JP20519093A JP20519093A JPH0752259A JP H0752259 A JPH0752259 A JP H0752259A JP 20519093 A JP20519093 A JP 20519093A JP 20519093 A JP20519093 A JP 20519093A JP H0752259 A JPH0752259 A JP H0752259A
Authority
JP
Japan
Prior art keywords
fusion
joint
diameter
time
energization
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
JP20519093A
Other languages
English (en)
Other versions
JP2817582B2 (ja
Inventor
Hitoshi Asano
均 浅野
Katsunori Fujimura
克範 藤村
Koichi Kitao
幸市 北尾
Sadao Ozawa
貞夫 小澤
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.)
JFE Engineering Corp
Original Assignee
NKK Corp
Nippon Kokan 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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=16502899&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=JPH0752259(A) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by NKK Corp, Nippon Kokan Ltd filed Critical NKK Corp
Priority to JP5205190A priority Critical patent/JP2817582B2/ja
Publication of JPH0752259A publication Critical patent/JPH0752259A/ja
Application granted granted Critical
Publication of JP2817582B2 publication Critical patent/JP2817582B2/ja
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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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
    • B29C65/34—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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—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
    • B29C66/90—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
    • B29C66/912—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux
    • B29C66/9121—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature
    • B29C66/91211—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature with special temperature measurement means or methods
    • B29C66/91214—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature with special temperature measurement means or methods by measuring the electrical resistance of a resistive element belonging to one of the parts to be welded, said element acting, e.g. as a thermistor
    • 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
    • B29C66/912—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux
    • B29C66/9131—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the heat or the thermal flux, i.e. the heat flux
    • B29C66/91311—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the heat or the thermal flux, i.e. the heat flux by measuring the heat generated by Joule heating or induction heating
    • B29C66/91315—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the heat or the thermal flux, i.e. the heat flux by measuring the heat generated by Joule heating or induction heating by measuring 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
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/912—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux
    • B29C66/9131—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the heat or the thermal flux, i.e. the heat flux
    • B29C66/91311—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the heat or the thermal flux, i.e. the heat flux by measuring the heat generated by Joule heating or induction heating
    • B29C66/91317—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the heat or the thermal flux, i.e. the heat flux by measuring the heat generated by Joule heating or induction heating by measuring the electrical resistance
    • 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
    • B29C66/91643—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 following a heat-time profile
    • 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
    • B29C66/92—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools
    • B29C66/922—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by measuring the pressure, the force, the mechanical power or the displacement of the joining tools
    • B29C66/9221—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by measuring the pressure, the force, the mechanical power or the displacement of the joining tools by measuring the pressure, the force or the mechanical power
    • B29C66/92211—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by measuring the pressure, the force, the mechanical power or the displacement of the joining tools by measuring the pressure, the force or the mechanical power with special measurement means or methods
    • 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
    • B29C66/97—Checking completion of joining or correct joining by using indications on at least one of the joined parts
    • B29C66/972—Checking completion of joining or correct joining by using indications on at least one of the joined parts by extrusion of molten material
    • 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
    • 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
    • B29C66/8126—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 intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/81262—Electrical and dielectric properties, e.g. electrical conductivity
    • 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
    • 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
    • B29C66/94—Measuring or controlling the joining process by measuring or controlling the 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
    • B29C66/95—Measuring or controlling the joining process by measuring or controlling specific variables not covered by groups B29C66/91 - B29C66/94
    • B29C66/959—Measuring or controlling the joining process by measuring or controlling specific variables not covered by groups B29C66/91 - B29C66/94 characterised by specific values or ranges of said specific variables
    • B29C66/9592—Measuring or controlling the joining process by measuring or controlling specific variables not covered by groups B29C66/91 - B29C66/94 characterised by specific values or ranges of said specific variables in explicit relation to another variable, e.g. X-Y diagrams
    • 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)

Abstract

(57)【要約】 【目的】継手の口径を簡便かつ確実に識別し、強制停止
時間を口径毎に異なる時間で設定しうる手段を提供する
ことにある。 【構成】熱可塑性プラスチック管を接続する際に、抵抗
が温度依存性であってかつ各口径毎に種類の異なる電熱
線が埋設されている電気融着継手を用い、融着制御装置
により融着する際の通電開始時の電流値または抵抗値お
よび通電開始一定時間後に電流値または抵抗値を測定
し、これらの値を予め入力してある値と照合させて口径
を識別させ、該口径に応じて予め設定された範囲を越え
たときに通電を停止させる。

Description

【発明の詳細な説明】
【０００１】
【産業上の利用分野】本発明は、熱可塑性電気融着継手
の熱可塑性プラスチック管への融着方法に関し、特に、
電気融着継手への通電時間過剰による異常加熱を継手の
口径を識別して未然に防止しうる電気融着方法に関す
る。
【０００２】
【従来の技術】電気融着継手は、ガス管等の熱可塑性プ
ラスチック管の継手として近年急速に普及しだしたもの
で、内周面に電熱線を埋め込んだ成形品である。管との
融着は、この電熱線に一定電圧で所定の電力を付与し、
界面を加熱溶融することにより行われる。通電時間は継
手の口径や種類に応じて予め設定された時間通電を行う
必要があるが、現場施工を簡略化するため、融着時に融
着材料の温度、材料の融解に伴う圧力等の特性変化をセ
ンサーで測定し、その情報に基づいて通電を自動的に停
止する融着方法がある(特開昭63−111394号公報、特開
平５−60288号公報）。これらの方法では、定量的でか
つ安定した結果が得られるが、管と継手の差し込み不
足、センサー部のプラグ差し込み不良等の原因により所
定の通電時間が過ぎても通電が自動的に終了しないこと
があった。これらの原因により過剰に通電が長時間行わ
れた場合、融着材料の熱劣化、管の溶け落ち、電熱線の
短絡、発火等がおこる危険性があるため、所定の通電時
間を大幅に超えても通電が自動的に終了しない場合、通
電を強制的に停止させる必要があった。その防止手段と
して、通電開始時から継手の口径や種類に関係無く、一
律の時間で通電を強制停止する方法がある。しかし、口
径が大きくなれば融着時間も長くなるため、大口径管用
継手では従来と異なる時間に設定する必要があり、その
ためには従来の小口径管用継手と大口径管用継手を制御
装置が識別する必要がある。
【０００３】従来、この電気融着継手の識別方法として
は、継手内部に継手の種類に応じて異なる抵抗値の識別
用抵抗器を埋め込み、その抵抗値を測定することで継手
を識別する方法（特開昭58−131025号公報）、継手と一
体成形されたデータ記録板の穿孔の有無を光センサーに
より読みとることで識別する方法(特開平１−17269号公
報）、継手の電熱体に通電するための通電ターミナルを
継手の品種ごとに異なる径に設定し、この径を測定する
ことによってその品種を識別する方法（特開平４−8829
3号公報)、融着時に最初に検出された電流の大きさから
識別する方法（特公平３−27014号公報）などがある。
【０００４】
【発明が解決しようとする課題】上記の継手の識別方法
では、継手に特別な認識抵抗やデータ記録版を付加する
必要があるために、継手の製造が煩雑となっていた。ま
た、通電ターミナルの径を品種ごとに異なる径に設定す
ることで識別する方法では、施工者がターミナル径を測
定する必要があり施工作業が煩雑となっていた。また、
一般に大口径管用継手では小口径管用継手に比べ融着時
に必要な総熱量が大きいため、融着作業用の融着制御装
置の出力も大きくする必要がある。しかし、出力を上げ
れば装置の大型化は避けられず携帯性が失われる。した
がって携帯性を考慮すれば、大口径管用の継手ではその
口径の種類に関係なく融着制御装置の最大出力を用いて
融着する必要が生じる。この場合、融着時に最初に検出
された電流値からだけでは、大口径管用継手の口径を識
別することはできない。
【０００５】そこで、本発明の主たる目的は、継手の口
径を簡便かつ確実に識別し、強制停止時間を口径毎に異
なる時間で設定しうる手段を提供することにある。
【０００６】
【課題を解決するための手段】本発明は上記目的を達成
した口径の識別方法及び熱可塑性プラスチック管への電
気融着継手の融着接合方法を提供するものである。
【０００７】かかる口径の識別方法は、熱可塑性プラス
チック管を接続する際に、抵抗が温度依存性であってか
つ各口径毎に種類の異なる電熱線が埋設されている電気
融着継手を用い、融着制御装置により融着する際の通電
開始時の電流値または抵抗値および通電開始一定時間後
に電流値または抵抗値を測定し、これらの値を予め入力
してある値と照合させることを特徴としている。
【０００８】また、熱可塑性プラスチック管への電気融
着継手の融着接合方法は上記の方法により融着制御装置
に、口径を識別させた後、さらに総積算電力量又は融着
時間を検知させ、予め各口径毎に設定してある総積算電
力量又は融着時間と比較させ、総積算電力量又は融着時
間の範囲外となった場合に通電を停止させることを特徴
としている。
【０００９】熱可塑性プラスチック管の材質、肉厚、口
径等は用途等との関係で定まるが、材質は例えば塩化ビ
ニル樹脂、ポリエチレン樹脂、ポリプロピレン樹脂、ポ
リスチレン樹脂等である。
【００１０】電気融着継手は公知のいかなる構造のもの
でも適用でき、一般的にはソケット型であって内周面近
くに電熱線が埋設されているものである。
【００１１】本発明においてはこの電熱線に、抵抗が温
度依存性であってかつ各口径毎に種類(抵抗の温度変化)
の異なるものを用いる。このような材質の組合せの例と
して、ＪＩＳ Ｃ2532−1990で規定されているＧＦＣ142
Ｗ、ＧＦＣ123Ｗ、ＧＦＣ111Ｗ、ＧＮＣ112Ｗ、ＧＮＣ1
08Ｗ、ＧＮＣ101Ｗ、ＧＮＣ69Ｗ、ＧＳＵ72Ｗ、ＧＣＭ4
4Ｗ、ＧＣＮ49Ｗ、ＧＣＮ30Ｗ、ＧＣＮ15Ｗ、ＧＣＮ10
Ｗ、ＧＣＮ５Ｗ、ＧＮＡ28Ｗ、ＧＮ9.6Ｗ、ＧＣＮ49、
ＧＣＮ30、ＧＣＮ15、ＧＣＮ10、ＧＣＮ５などから適宜
選択して組合せればよい。
【００１２】電気融着継手には電熱線が埋設されるほ
か、この電熱線のターミナル、継手の融着面の溶融を検
知するセンサーの取付部等が適宜設けられる。
【００１３】融着制御装置は電熱線への供電部、この供
電の電流値または抵抗値の測定部、検出した電流値また
は抵抗値を予め入力してある値と照合して口径を識別す
る演算部等からなる。この予め入力させる値は各電気融
着接手（口径、材質等）と熱可塑性プラスチック管（口
径、材質等）について予め測定して求めておいた値であ
る。融着制御装置にはそのほかセンサーからの信号を検
知して供電の停止を指令する機槽等を適宜設けることが
できる。
【００１４】
【作用】一般に小口径管用継手では大口径管用継手に比
べ融着時に必要な総熱量が少ないため、電熱線の発熱量
を抑えても短時間で融着は可能である。このため電熱線
の抵抗値は大口径管用に比べ大きくすることが可能であ
る。そこで、小口径管用継手で使用する電熱線の抵抗値
を大口径管用継手に比べ大きくすれば、通電開始時の電
流値または抵抗値を測定することで、容易に小口径管用
と大口径管用を識別することが可能となる。
【００１５】さらに、また電熱線の成分を変えること
で、通電中の温度の上昇に伴う電流値および抵抗値の時
間毎の変化量を変えることができる。そこで通電を始め
てから一定時間後の電流値または抵抗値を測定し、通電
開始時の電流値または抵抗値と比較して、その変化量ま
たは積算電力量を知れば使用されている電熱線の種類を
判断することができる。したがって、口径別に電熱線の
種類を変えれば、容易に口径を識別することができる。
【００１６】以上の方法によれば継手の口径を簡便かつ
確実に識別し、強制停止時間を口径毎に異なる時間で設
定することができる。
【００１７】
【実施例】図１は熱可塑性プラスチック管１とソケット
型電気融着継手２の接続状態を示す断面図である。この
ソケット型継手２の内周面には発熱体である電熱線３が
螺旋状に埋め込まれ、その電熱線３の両端各々は外周面
より突きだし、２つのコネクターピン４に接続されてい
る。電力は図３の融着制御装置32よりこのコネクターピ
ン４を介して印加される。また凹部５には融着制御装置
32から圧力センサー38が差し込まれる。凹部５の底部に
は電熱線の発熱により溶解膨張した材料が入り込み、凹
部５内にて高さを増し圧力センサー38の接点を押し上げ
る。この時点で通電は停止される。表1には口径サイズ7
5Ａ、100Ａ、150Ａ、および200Ａの各継手に用いたＪＩ
Ｓ規格品銅ニッケル線の種類を示した。
【００１８】
【表１】
【００１９】次に、図２はこれらの口径サイズのソケッ
ト型継手による定電圧下での電気融着時の電流の経時変
化を示した。図中、点線が垂直に下がるところが通電停
止位置である。
【００２０】図３には融着制御装置の基本構成を示し
た。ＣＰＵ33には以下の様なプログラムを組み入れた。
通電の開始時に電流計39で電流値を計測させ、予めメモ
リー35に記憶させた設定値と比較させる。20Ａ未満なら
ば、小口径管と判断させ、250秒でスイッチ35により強
制停止させる。20Ａ以上であれば150秒後に電流計32で
再び電流値を測定し、メモリー34の値と比較させる。こ
こで15.50〜17.00Ａならば100Ａ管と、17.50〜20.00Ａ
ならば150Ａ管と、21.50〜24.00Ａならば200Ａ管と判断
させそれぞれ300秒、340秒、380秒で通電を強制停止さ
せる。
【００２１】この強制停止時間は環境温度23℃における
最適融着時間に120秒を加えたものである。
【００２２】上記の実施例では電流値により識別させて
いるが、抵抗値および付与した電力量の積算値で識別さ
せる態様でも行われる。
【００２３】
【発明の効果】本発明によれば通電開始時および通電中
の電流値または抵抗値を測定することにより継手の口径
が簡便かつ確実に識別できるため、口径毎に異なる時間
で通電を強制停止できる。このため口径のサイズに関係
無く自動的に異常加熱を未然に防ぐことができる。本発
明の方法は継手自身に特別な加工を施すことなく、従来
の方法をそのまま適用できる。
【図面の簡単な説明】
【図１】 熱可塑性プラスチック管をソケット型電気融
着接手で接続している状態を示す断面図である。
【図２】 各口径のソケット型継手による定電圧下での
電気融着時の電流の経時変化の例を示すグラフである。
【図３】 融着制御装置の構成例を示すブロック図であ
る。
【符号の説明】
１…熱可塑性プラスチック管 ２…電気融着継手 ３…電熱線 32…融着制御装置
───────────────────────────────────────────────────── フロントページの続き (72)発明者 小澤 貞夫 東京都千代田区丸の内一丁目１番２号 日 本鋼管株式会社内

Claims (2)

    【特許請求の範囲】
  1. 【請求項１】 熱可塑性プラスチック管を接続する際
    に、抵抗が温度依存性であってかつ各口径毎に種類の異
    なる電熱線が埋設されている電気融着継手を用い、融着
    制御装置により融着する際の通電開始時の電流値または
    抵抗値および通電開始一定時間後に電流値または抵抗値
    を測定し、これらの値を予め入力してある値と照合させ
    ることを特徴とする口径の識別方法
  2. 【請求項２】 請求項１に記載の方法により融着制御装
    置に、口径を識別させた後、さらに総積算電力量又は融
    着時間を検知させ、予め各口径毎に設定してある総積算
    電力量又は融着時間と比較させ、総積算電力量又は融着
    時間の範囲外となった場合に通電を停止させることを特
    徴とする熱可塑性プラスチック管への電気融着継手の融
    着接合方法
JP5205190A 1993-08-19 1993-08-19 熱可塑性プラスチック管の電気融着方法 Expired - Fee Related JP2817582B2 (ja)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20010047859A (ko) * 1999-11-23 2001-06-15 오동찬 소켓형 자동 융착장치

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20010047859A (ko) * 1999-11-23 2001-06-15 오동찬 소켓형 자동 융착장치

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