JPH09229281A - Electrofusion coupling and thermoplastic resin pipe - Google Patents

Electrofusion coupling and thermoplastic resin pipe

Info

Publication number
JPH09229281A
JPH09229281A JP8033272A JP3327296A JPH09229281A JP H09229281 A JPH09229281 A JP H09229281A JP 8033272 A JP8033272 A JP 8033272A JP 3327296 A JP3327296 A JP 3327296A JP H09229281 A JPH09229281 A JP H09229281A
Authority
JP
Japan
Prior art keywords
heat
thermoplastic resin
joint
peripheral surface
sensitive
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
JP8033272A
Other languages
Japanese (ja)
Inventor
Kazuhiko Iwata
一彦 岩田
Satoru Nagami
哲 永見
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.)
Mitsui Petrochemical Industries Ltd
Original Assignee
Mitsui Petrochemical Industries 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 Mitsui Petrochemical Industries Ltd filed Critical Mitsui Petrochemical Industries Ltd
Priority to JP8033272A priority Critical patent/JPH09229281A/en
Publication of JPH09229281A publication Critical patent/JPH09229281A/en
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
    • 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
    • B29C66/12—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
    • B29C66/50—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
    • 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
    • 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
    • B29C66/91218—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 using colour change, e.g. using separate colour indicators
    • 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
    • B29C66/91221—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 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
    • B29C66/90—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
    • B29C66/919—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Branch Pipes, Bends, And The Like (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)

Abstract

PROBLEM TO BE SOLVED: To visually confirm whether fusion of a pipe and a coupling is reliably performed or not by a nondestructive test, in an electrofusion coupling having heating wires buried in the inner peripheral surface and for performing fusing connection to a thermoplastic resin pipe by electrification to the heating wires. SOLUTION: Tape-shaped heat sensitive materials 5 whose color is to be changed when they are heated at the temperature of 200 deg.C are stuck on the inner peripheral surface of an electrofusion coupling 1 in which the outer peripheral part is taken as a bridging polyolefine layer having heat resistance, the inner peripheral part is taken as a non bridging polyolefine layer 3, and heating wires 4 are buried in the non bridging polyolefine layers 3. A recessed part 6 is formed on the coupling 1, fusing work is confirmed by seeing the deformation of a thin part of the recessed part 6 by the heat expansion of the non bridging polyolefine layer 3 in fusing to thermoplastic resin pipes 8, and it is confirmed that the thermoplastic resin pipe 8 reaches the temperature required for fusing by seeing the change of the color of the heat sensitive materials from the recessed part 6.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【発明が属する技術分野】本発明は、エアー、ガス、水
その他流体が通される熱可塑性樹脂管を融着により接合
するエレクトロフュージョン継手と、該継手と融着され
る熱可塑性樹脂管に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrofusion joint for joining a thermoplastic resin pipe through which air, gas, water and other fluids are passed by fusion, and a thermoplastic resin pipe fused with the joint.

【０００２】[0002]

【従来技術】熱可塑性樹脂管を接合する方法として従
来、内周面に電熱線を埋設したエレクトロフュージョン
継手を用い、電熱線に通電して発熱させることにより、
継手内周面と管外周面を融着接合する方法が知られる。
この方法は、管と継手が完全に一体接合されるため、接
合に対する信頼性は非常に高い。2. Description of the Related Art Conventionally, as a method of joining thermoplastic resin pipes, an electrofusion joint having a heating wire embedded in its inner peripheral surface has been used to generate heat by energizing the heating wire.
A method of fusion bonding the inner peripheral surface of the joint and the outer peripheral surface of the pipe is known.
In this method, since the pipe and the joint are completely integrally joined, the reliability of the joining is very high.

【０００３】従来のエレクトロフュージョン継手は、融
着が行われたことを確認するために継手にインジケータ
と称される孔を径方向に形成し、加熱溶融時の熱膨張に
よりインジケータから溶融樹脂が突出してくるように設
計されているものが多い。In the conventional electrofusion joint, a hole called an indicator is formed in the joint in the radial direction in order to confirm that fusion has been performed, and the molten resin projects from the indicator due to thermal expansion during heating and melting. Many are designed to come.

【０００４】[0004]

【発明が解決しようとする課題】上述の継手でインジケ
ータから膨出してくる樹脂は電熱線周辺の継手側の樹脂
であり、管表面の樹脂が出てくる訳ではないため、正確
には管表面まで樹脂が溶融したかどうかの確認はできな
い。本発明の目的は、管と継手の融着接合が確実に行わ
れたかどうかを非破壊検査によって目視で確認すること
ができるエレクトロフュージョン継手と、エレクトロフ
ュージョン継手との融着接合に用いる熱可塑性樹脂管を
提供することである。The resin that swells from the indicator in the above-mentioned joint is the resin on the joint side around the heating wire, and not the resin on the pipe surface. It is not possible to confirm whether or not the resin has melted. An object of the present invention is to provide an electrofusion joint capable of visually confirming whether fusion bonding of a pipe and a joint is reliably performed by a nondestructive inspection, and a thermoplastic resin used for fusion bonding of an electrofusion joint. Is to provide a tube.

【０００５】[0005]

【課題の解決手段】第１の発明のエレクトロフュージョ
ン継手は、一部又は全体が透明若しくは半透明の熱可塑
性樹脂よりなり、内周面には電熱線が埋設されると共
に、内周面の一部又は全体に融着に必要な温度に達した
ときに変色する感熱域を設け、感熱域の変色を外部から
透視できるようにしたものである。According to a first aspect of the present invention, an electrofusion joint is partially or wholly made of a transparent or translucent thermoplastic resin and has an inner peripheral surface on which a heating wire is embedded and at the same time an inner peripheral surface having A part or the whole is provided with a heat-sensitive area that discolors when the temperature required for fusion is reached, and the discoloration of the heat-sensitive area can be seen through from the outside.

【０００６】第２の発明の熱可塑性樹脂管は、一部又は
全体が透明若しくは半透明の熱可塑性樹脂からなり、内
周面には電熱線が埋設されるエレクトロフュージョン継
手との融着接合に用いる熱可塑性樹脂管であって、少な
くとも継手と接する管外周面の一部又は全体に融着に必
要な温度に達したときに変色する感熱域を設け、感熱域
の変色を継手外部から透視できるようにしたものであ
る。The thermoplastic resin pipe of the second invention is partially or wholly made of a transparent or translucent thermoplastic resin, and is used for fusion bonding with an electrofusion joint in which a heating wire is embedded on the inner peripheral surface. A thermoplastic resin tube to be used, at least a part of or the entire outer peripheral surface of the tube that is in contact with the joint is provided with a heat-sensitive area that discolors when the temperature required for fusion is reached, and the discoloration of the heat-sensitive area can be seen through from the outside of the joint. It was done like this.

【０００７】上記各発明によれば、継手外部から感熱域
の変色を判別することにより、感熱域と接する管外周面
或いは感熱域を有する管外周面が融着に必要な温度に達
したのを確認することができる。感熱域の色判断は、継
手の透明若しくは半透明部を通して行われるが、樹脂層
の厚みが厚いと、感熱域の色判別が難しくなることがあ
る。そのため継手は薄肉の方が好ましいが、全体を肉薄
にした場合、加熱及び溶融接合時の樹脂の熱膨張により
継手が変形するおそれがある。したがって継手は熱膨張
によって変形しない程度の厚みにし、一部にのみ凹所を
設けて凹所より感熱域を透視できるようにするとよい。
この場合、凹所の底より感熱域までの樹脂のみを透視若
しくは半透明とすることができる。According to each of the above inventions, by determining the discoloration of the heat-sensitive area from the outside of the joint, it is possible to determine that the outer peripheral surface of the tube in contact with the heat-sensitive area or the outer peripheral surface of the tube having the heat-sensitive area has reached the temperature required for fusion bonding. You can check. The color of the heat-sensitive area is determined through the transparent or translucent portion of the joint, but if the resin layer is thick, the color of the heat-sensitive area may be difficult to determine. Therefore, the joint is preferably thin, but when the whole is thin, the joint may be deformed due to thermal expansion of the resin at the time of heating and fusion bonding. Therefore, it is preferable that the joint has a thickness that does not deform due to thermal expansion, and a recess is provided only in a part so that the heat sensitive region can be seen through the recess.
In this case, only the resin from the bottom of the recess to the heat sensitive area can be seen through or semi-transparent.

【０００８】上述の凹所は継手の一か所に設けてもよい
し、複数か所に設けてもよい。また、凹所の大きさも継
手の強度を損なわず、継手全体が変形しない程度であれ
ば特に制限されない。上述する各発明の継手は、全体が
熱可塑性樹脂より構成されていてもよいし、管と接する
内周部のみを熱可塑性樹脂とし、外周部を強度のある他
の樹脂より構成してもよい。例えば継手全体を非架橋ポ
リオレフィンより構成してもよいし、内周部を非架橋ポ
リオレフィン、外周部を架橋ポリオレフィンより構成し
てもよい。非架橋ポリオレフィンは一般に、熱可塑性樹
脂として使用されている架橋性を有しないポリオレフィ
ン樹脂で、ポリオレフィンとしては炭素数２〜２０、好
ましくは２〜１２のα−オレフィンの単独又は共重合体
が挙げられ、好ましいα−オレフィンとしては、エチレ
ン、プロピレン、ブテン−１、４−メチルペンテン−１
等が挙げられる。架橋ポリオレフィンはポリオレフィン
の分子間架橋により立体構造となったもので、シラン架
橋、ジビニルベンゼン架橋等の架橋剤により架橋したも
のゝほか、有機過酸化物、放射線等により直接架橋した
ものであってもよい。The above-mentioned recesses may be provided at one place of the joint or at a plurality of places. Further, the size of the recess is not particularly limited as long as the strength of the joint is not impaired and the entire joint is not deformed. The joint of each invention described above may be entirely made of a thermoplastic resin, or may be made of a thermoplastic resin only in the inner peripheral portion in contact with the pipe and may be made of another resin having a strong outer peripheral portion. . For example, the entire joint may be made of non-crosslinked polyolefin, the inner peripheral portion may be made of non-crosslinked polyolefin, and the outer peripheral portion may be made of crosslinked polyolefin. The non-crosslinked polyolefin is generally a non-crosslinkable polyolefin resin used as a thermoplastic resin, and examples of the polyolefin include a homopolymer or a copolymer of an α-olefin having 2 to 20 carbon atoms, preferably 2 to 12 carbon atoms. And preferred α-olefins are ethylene, propylene, butene-1,4-methylpentene-1.
And the like. Cross-linked polyolefin has a three-dimensional structure due to inter-molecular cross-linking of polyolefin, and may be cross-linked with a cross-linking agent such as silane cross-link or divinylbenzene cross-link, or may be directly cross-linked with organic peroxide, radiation or the like. Good.

【０００９】管は少なくとも継手と接触する外周部が、
継手と同種の樹脂又は相容性を有する樹脂から構成する
のが望ましい。上記各発明の感熱域は、継手又は管を成
形後に継手内周面又は管外周面に溶媒に溶いた感熱剤を
塗布し、或いはテープ、フィルム若しくはシート（以下
単にテープという）状の感熱材を貼付する方法、成形時
にテープ状の感熱材を一体成形する方法、感熱剤を混入
した樹脂よりなるスリーブを一体成形する方法などによ
って形成することができるが、いづれの方法による場合
も感熱剤（材）は継手と管との融着性を阻害しないもの
でなければならない。At least the outer peripheral portion of the pipe, which is in contact with the joint,
It is desirable that the joint is made of the same kind of resin or a resin having compatibility. The heat-sensitive area of each of the above inventions is to apply a heat-sensitive agent dissolved in a solvent to the inner peripheral surface of the joint or the outer peripheral surface of the pipe after molding the joint or pipe, or to form a tape, film or sheet (hereinafter simply referred to as tape) heat-sensitive material It can be formed by a method such as sticking, integrally molding a tape-shaped heat sensitive material at the time of molding, or integrally molding a sleeve made of resin mixed with a heat sensitive agent. ) Must not interfere with the fusion between the joint and the pipe.

【００１０】感熱域を構成する感熱剤（材）としては、
使用する樹脂の融点或いは融点以上の温度で変色するも
の、例えば熱可塑性樹脂としてポリエチレンを使用する
場合、ポリエチレンの融点が１２５℃以上であるため、
１２５℃以上に加熱されたことが確認できるような変色
点を有するものであればよいが、ポリエチレンを用いた
エレクトロフュージョン継手の場合、一般には融着界面
が２００℃程度になるように設計されているため、２０
０℃以上になったことを確認できる変色点を有するもの
が好ましい。As the heat-sensitive agent (material) constituting the heat-sensitive region,
A resin that changes color at the melting point of the resin used or at a temperature above the melting point, for example, when polyethylene is used as the thermoplastic resin, the melting point of the polyethylene is 125 ° C. or higher,
Any material that has a discoloration point that can be confirmed to have been heated to 125 ° C. or higher may be used, but in the case of an electrofusion joint using polyethylene, it is generally designed so that the fusion interface is about 200 ° C. Because there are 20
Those having a color change point capable of confirming that the temperature is 0 ° C. or higher are preferable.

【００１１】感熱剤（材）は以上のように、融着に必要
な温度に達したとき変色するものであればよく、特に規
定はないが、一旦変色すると、その後温度低下してもそ
のまゝの色を保持するような感熱剤（材）を用いること
が好ましい。これにより融着接合を行ったのち、しばら
く時間が経過しても融着の完了したことが確認できるよ
うになる。As described above, the heat-sensitive agent (material) may be any one as long as it can change its color when the temperature required for fusion is reached, and there is no particular limitation. It is preferable to use a heat-sensitive agent (material) that retains the color of. This makes it possible to confirm that the fusion has been completed even after some time has passed after performing the fusion bonding.

【００１２】なお、感熱域を上述するように成形時に形
成する場合には、温度によって色が異なり、成形時に加
えられる熱によって変色する色と、融着接合時に変色す
る色とが異なるような感熱剤（材）が用いられる。第３
の発明のエレクトロフュージョン継手は、一部又は全体
が透明若しくは半透明の熱可塑性樹脂よりなり、内周面
には電熱線が埋設されると共に、少なくとも内周面に
は、その一部又は全体に熱可塑性樹脂管に混入される化
合物と反応すると、発色ないし変色する化合物が混入
し、融着時に継手に混入される化合物が管に混入される
化合物と混ざり合って、発色ないし変色するようにした
ものである。When the heat sensitive region is formed at the time of molding as described above, the color differs depending on the temperature, and the color that changes color due to the heat applied during molding differs from the color that changes color during fusion bonding. Agent (material) is used. Third
The electrofusion joint of the invention of is partially or entirely made of a transparent or translucent thermoplastic resin, and the heating wire is embedded in the inner peripheral surface, and at least the inner peripheral surface has a part or the whole thereof. A compound that develops or discolors when it reacts with the compound mixed in the thermoplastic resin tube is mixed, and the compound mixed in the joint at the time of fusion is mixed with the compound mixed in the tube so that it develops or changes color. It is a thing.

【００１３】第４の発明の熱可塑性樹脂管は、一部又は
全体が透明若しくは半透明の熱可塑性樹脂からなり、内
周面には電熱線が埋設されるエレクトロフュージョン継
手との融着接合に用いる熱可塑性樹脂管であって、少な
くとも継手と接する管外周面には、その一部又は全体に
継手に混入される化合物と反応すると発色ないし変色す
る化合物が混入され、融着時に管に混入される化合物が
継手に混入される化合物と混ざり合って発色ないし変色
するようにしたものである。The thermoplastic resin pipe of the fourth invention is made of a transparent or semitransparent thermoplastic resin partially or wholly, and is used for fusion bonding with an electrofusion joint in which a heating wire is embedded on the inner peripheral surface. The thermoplastic resin pipe used, at least on the outer peripheral surface of the pipe in contact with the joint, a compound that develops or discolors when reacted with the compound mixed in the joint in part or in whole, and is mixed in the pipe during fusion. The above compound is mixed with the compound mixed in the joint to cause color development or discoloration.

【００１４】上記各発明によれば、継手外部から発色な
いし変色の有無を確認することにより継手と管の接触面
が溶融し、融着が完了したのを目視で確認することがで
きる。上記各発明において用いられる化合物は、混ざり
合うと発色ないし変色するものであればどのようなもの
でもよく、継手側の化合物と管側の化合物は同じもので
あっても異なっていてもよい。こうした化合物には種々
のものがあり、例えば、酸化還元反応するようなものな
どが例示される。According to the above inventions, it is possible to visually confirm that the contact surface between the joint and the pipe is melted and the fusion is completed by confirming the presence or absence of color development or discoloration from the outside of the joint. The compound used in each of the above inventions may be any compound as long as it develops or changes color when mixed, and the compound on the joint side and the compound on the tube side may be the same or different. There are various types of such compounds, and examples thereof include those that undergo a redox reaction.

【００１５】[0015]

【発明の実施の形態】図１に示すエレクトロフュージョ
ン継手１は、架橋ポリオレフィンよりなる継手本体２の
左右両側の内周部にスリーブ状の非架橋ポリオレフィン
層３を一体成形し、非架橋ポリオレフィン層３の内部、
外周面或いは内周面に電熱線４を埋設したもので、非架
橋ポリオレフィン層３の内周面にはポリオレフィンの融
点である１２５℃以上の２００℃程度になったときに変
色するテープ状の感熱材５が貼付してあり、また非架橋
ポリオレフィン層上の継手本体２には凹所６が形成さ
れ、凹所６より架橋及び非架橋ポリオレフィン層２、３
を通して感熱材５の色変化が透視できるようになってい
る。BEST MODE FOR CARRYING OUT THE INVENTION In an electrofusion joint 1 shown in FIG. 1, a sleeve-shaped non-crosslinked polyolefin layer 3 is integrally molded on the inner peripheral portions of the left and right sides of a joint main body 2 made of crosslinked polyolefin, and the non-crosslinked polyolefin layer 3 is formed. Inside the
The heating wire 4 is embedded in the outer peripheral surface or the inner peripheral surface, and the inner peripheral surface of the non-crosslinked polyolefin layer 3 is a tape-shaped heat sensitive material that discolors when it reaches about 200 ° C., which is 125 ° C. or higher which is the melting point of polyolefin. The material 5 is attached, and the recess 6 is formed in the joint body 2 on the non-crosslinked polyolefin layer. From the recess 6, the crosslinked and noncrosslinked polyolefin layers 2, 3 are formed.
The color change of the heat sensitive material 5 can be seen through.

【００１６】図中、７は継手１の左右両側に突設され、
電熱線４に繋がる接続端子である。また、８は継手１に
左右両側より差込まれるポリエチレン等の熱可塑性樹脂
管である。熱可塑性樹脂管８は、全体が融着性の熱可塑
性樹脂よりなるものでもよいが、架橋ポリオレフィン等
の耐熱性材料を用いる場合は、外周面を融着性の非架橋
ポリオレフィン等よりなる熱可塑性樹脂で被覆したもの
が用いられる。In the figure, numeral 7 is provided on both left and right sides of the joint 1,
It is a connection terminal connected to the heating wire 4. Numeral 8 is a thermoplastic resin tube such as polyethylene which is inserted into the joint 1 from the left and right sides. The thermoplastic resin tube 8 may be entirely made of a fusible thermoplastic resin, but when a heat resistant material such as a crosslinked polyolefin is used, the outer peripheral surface of the thermoplastic resin tube 8 is made of a fusible noncrosslinked polyolefin or the like. What is coated with a resin is used.

【００１７】上述の実施形態では、感熱材５は継手側に
貼付されているが、別の例では熱可塑性樹脂管８の外周
面に貼付される。また別の例では、感熱材５を貼付する
代わりに溶媒に溶かした感熱剤が塗布される。図２は、
エレクトロフュージョン継手１と熱可塑性樹脂管８を融
着接合した後の状態を示す。図において、凹所６の肉厚
は薄く強度が低いため、非架橋ポリオレフィン層３の熱
膨張によって変形する。したがって凹所６での変形によ
って融着作業が行われたことを確認することができる。
また凹所６を通して感熱材５を透視し、感熱材５の変色
を確認することで管８の外周面が融着に必要な温度に達
していることを判断することができる。In the above embodiment, the heat sensitive material 5 is attached to the joint side, but in another example, it is attached to the outer peripheral surface of the thermoplastic resin tube 8. In another example, instead of sticking the heat sensitive material 5, a heat sensitive agent dissolved in a solvent is applied. FIG.
The state after fusion-bonding the electrofusion joint 1 and the thermoplastic resin pipe 8 is shown. In the figure, since the recess 6 has a small thickness and low strength, it is deformed by the thermal expansion of the non-crosslinked polyolefin layer 3. Therefore, it is possible to confirm that the fusion work is performed by the deformation in the recess 6.
Further, it is possible to judge that the outer peripheral surface of the tube 8 has reached the temperature necessary for fusion by seeing through the heat sensitive material 5 through the recess 6 and confirming the discoloration of the heat sensitive material 5.

【００１８】上述の実施形態では、継手或いは熱可塑性
樹脂管に感熱材（剤）を設けているが、別の実施形態で
は感熱材（剤）に代え、継手及び管側にそれぞれ加熱す
ると酸化或いは還元して発色ないし変色する化合物が用
いられる。In the above-described embodiment, the joint or the thermoplastic resin pipe is provided with the heat-sensitive material (agent), but in another embodiment, instead of the heat-sensitive material (agent), heating the joint and the pipe side causes oxidation or oxidation. A compound that is reduced to develop or change color is used.

【００１９】[0019]

【発明の効果】請求項１記載のエレクトロフュージョン
継手及び請求項４記載の熱可塑性樹脂管によれば、継手
が透明ないし半透明であることから感熱域を透視するこ
とが可能で、感熱域の変色を判別することにより管の外
周面が融着に必要な温度に達していることを確認するこ
とができる。According to the electrofusion joint of claim 1 and the thermoplastic resin pipe of claim 4, since the joint is transparent or translucent, it is possible to see through the heat-sensitive region and By determining the discoloration, it can be confirmed that the outer peripheral surface of the tube has reached the temperature required for fusion bonding.

【００２０】請求項２記載の継手のように、凹所を設け
ると、凹所部分が肉薄となるため、感熱域が透視し易く
なるうえ、凹所での強度が低く、融着時の熱膨張によっ
て変形することにより融着が行われたことを確認するこ
とができる。請求項３記載の継手によれば、外周部が架
橋ポリオレフィンであるため耐熱性を有し、融着時の変
形を生じにくい。When the recess is provided as in the joint according to the second aspect, since the recessed portion becomes thin, the heat-sensitive region can be easily seen through, and the strength in the recess is low and the heat at the time of fusion It is possible to confirm that fusion has been performed by deforming due to expansion. According to the joint of claim 3, since the outer peripheral portion is the cross-linked polyolefin, it has heat resistance and is less likely to be deformed during fusion bonding.

【００２１】請求項５記載のように、継手内周面又は管
外周面に感熱剤を塗布するか、又は請求項６記載のよう
にテープ状の感熱材を貼付することにより、成形後の継
手又は管に感熱域を簡単に形成することができ、請求項
７記載のように、テープ状の感熱材を一体成形するか、
又は請求項８記載のように、感熱剤を混入した樹脂より
なるスリーブを一体成形することにより成形時に一工程
で感熱域を形成することができる。[0021] As described in claim 5, a heat-sensitive agent is applied to the inner peripheral surface of the joint or the outer peripheral surface of the pipe, or a tape-shaped heat-sensitive material is attached as described in claim 6, whereby the joint after molding is formed. Alternatively, the heat-sensitive area can be easily formed in the tube, and as described in claim 7, a tape-shaped heat-sensitive material is integrally formed, or
Alternatively, as described in claim 8, the heat-sensitive region can be formed in one step at the time of molding by integrally molding the sleeve made of resin mixed with the heat-sensitive agent.

【００２２】請求項９記載の感熱域は、成形後時間が経
って温度低下しても融着接合が完了したかどうかの確認
を行うことができる。請求項１０記載の感熱域は、成形
時に変色する色と、融着時に変色する色とが異なるた
め、融着接合の判別が容易にできるようになる。請求項
１１記載のエレクトロフュージョン継手及び請求項１２
記載の熱可塑性樹脂管によれば、継手が透明ないし半透
明であることから内部を透視することが可能で、化合物
同志の反応による発色ないし変色を継手を通して判別す
ることにより、融着が完了したかどうかを目視で確認す
ることができる。In the heat-sensitive area of the ninth aspect, it is possible to confirm whether the fusion bonding is completed or not even if the temperature decreases after a lapse of time after molding. In the heat-sensitive area according to claim 10, since the color that changes color during molding and the color that changes color during fusion are different, it is possible to easily determine fusion bonding. An electrofusion joint according to claim 11 and claim 12.
According to the thermoplastic resin tube described, since the joint is transparent or semi-transparent, it is possible to see through the inside, and the fusion or fusion is completed by determining the color development or discoloration due to the reaction of the compounds of each other through the joint. It can be visually confirmed whether or not it is.

【図面の簡単な説明】[Brief description of drawings]

【図１】融着前の状態を示す断面図。FIG. 1 is a cross-sectional view showing a state before fusion bonding.

【図２】融着後の状態を示す断面図。FIG. 2 is a cross-sectional view showing a state after fusion bonding.

【符号の説明】[Explanation of symbols]

１・・エレクトロフュージョン継手 ２・・継手
本体 ３・・非架橋ポリオレフィン層 ４・・電熱
線 ５・・感熱材 ６・・凹所 ７・・接続端子 ８・・熱可
塑性樹脂管1 ・ ・ Electrofusion joint 2 ・ ・ Joint body 3 ・ ・ Non-crosslinked polyolefin layer 4 ・ ・ Heating wire 5 ・ ・ Heat-sensitive material 6 ・ ・ Recess 7 ・ ・ Connecting terminal 8 ・ ・ Thermoplastic resin tube

Claims (12)

【特許請求の範囲】[Claims] 【請求項１】一部又は全体が透明若しくは半透明の熱可
塑性樹脂よりなり、内周面には電熱線が埋設されると共
に、内周面の一部又は全体に融着に必要な温度に達した
ときに変色する感熱域を設けたエレクトロフュージョン
継手。1. A part or the whole is made of a transparent or translucent thermoplastic resin, a heating wire is embedded in the inner peripheral surface, and a temperature necessary for fusion bonding is applied to a part or the whole inner peripheral surface. An electrofusion joint with a heat-sensitive area that changes color when it reaches. 【請求項２】一部に凹所が設けられる請求項１記載のエ
レクトロフュージョン継手。2. The electrofusion joint according to claim 1, wherein a recess is provided in a part. 【請求項３】内周部が非架橋ポリオレフィン、外周部が
架橋ポリオレフィンである請求項１又は２記載のエレク
トロフュージョン継手。3. The electrofusion joint according to claim 1, wherein the inner peripheral portion is a non-crosslinked polyolefin and the outer peripheral portion is a crosslinked polyolefin. 【請求項４】一部又は全体が透明若しくは半透明の熱可
塑性樹脂からなり、内周面には電熱線が埋設されるエレ
クトロフュージョン継手との融着接合に用いる熱可塑性
樹脂管であって、少なくとも継手と接する管外周面の一
部又は全体に融着に必要な温度に達したときに変色する
感熱域を設けた熱可塑性樹脂管。4. A thermoplastic resin tube which is used for fusion bonding with an electrofusion joint in which a part or the whole is made of a transparent or translucent thermoplastic resin and an electric heating wire is embedded in the inner peripheral surface, A thermoplastic resin tube having at least a part or the entire outer peripheral surface of the tube which is in contact with the joint, provided with a heat-sensitive area that changes color when the temperature required for fusion is reached. 【請求項５】請求項１記載のエレクトロフュージョン継
手又は請求項４記載の熱可塑性樹脂管の感熱域が継手又
は管を成形後に継手内周面又は管外周面に溶媒に溶いた
感熱剤を塗布することによって形成される。5. The heat sensitive region of the electrofusion joint according to claim 1 or the thermoplastic resin pipe according to claim 4 is coated with a heat sensitive agent dissolved in a solvent on the inner peripheral surface or the outer peripheral surface of the joint after molding the joint or the pipe. Is formed by 【請求項６】請求項１記載のエレクトロフュージョン継
手又は請求項４記載の熱可塑性樹脂管の感熱域は、継手
又は管を成形後に継手内周面又は管外周面にテープ、フ
ィルム若しくはシート状の感熱材を貼付することによっ
て形成される。6. The heat-sensitive zone of the electrofusion joint according to claim 1 or the thermoplastic resin pipe according to claim 4 is formed into a tape, film or sheet on the inner peripheral surface or the outer peripheral surface of the joint after molding the joint or the pipe. It is formed by attaching a heat-sensitive material. 【請求項７】請求項１記載のエレクトロフュージョン継
手又は請求項４記載の熱可塑性樹脂管の感熱域は、継手
又は管の成形時にテープ、フィルム若しくはシート状の
感熱材を一体成形することによって形成される。7. The heat-sensitive region of the electrofusion joint according to claim 1 or the thermoplastic resin pipe according to claim 4 is formed by integrally molding a tape, film or sheet-shaped heat-sensitive material at the time of molding the joint or pipe. To be done. 【請求項８】請求項１記載のエレクトロフュージョン継
手又は請求項４記載の熱可塑性樹脂管の感熱域は、感熱
剤を混入した樹脂よりなるスリーブを一体成形すること
によって形成される。8. The heat-sensitive region of the electrofusion joint according to claim 1 or the thermoplastic resin tube according to claim 4 is formed by integrally molding a sleeve made of a resin containing a heat-sensitive agent. 【請求項９】請求項１ないし８記載の感熱域を構成する
感熱剤ないし感熱材は、融着に必要な温度に達して一旦
変色すると、その後温度低下してもそのまゝの色を保持
する。9. The heat-sensitive agent or heat-sensitive material constituting the heat-sensitive region according to claim 1 retains its original color even if the temperature reaches a temperature necessary for fusion and discolors once, and then the temperature decreases thereafter. To do. 【請求項１０】請求項７又は８記載の感熱域を構成する
感熱剤ないし感熱材には、成形時に加えられる熱によっ
て変色する色と、融着接合時に変色する色とが異なるよ
うな感熱剤或いは感熱材が用いられる。10. The heat-sensitive agent or heat-sensitive material constituting the heat-sensitive region according to claim 7 or 8, wherein the color changed by heat applied during molding is different from the color changed by fusion bonding. Alternatively, a heat sensitive material is used. 【請求項１１】一部又は全体が透明若しくは半透明の熱
可塑性樹脂よりなり、内周面には電熱線が埋設されると
共に、少なくとも内周面には、その一部又は全体に熱可
塑性樹脂管に混入される化合物と反応すると、発色ない
し変色する化合物が混入されるエレクトロフュージョン
継手。11. A thermoplastic resin, which is partially or wholly transparent or semitransparent, has a heating wire embedded in the inner peripheral surface thereof, and at least a part or the whole of the inner peripheral surface thereof is made of a thermoplastic resin. An electrofusion joint in which a compound that develops or changes color when reacted with a compound mixed in a tube is mixed. 【請求項１２】一部又は全体が透明若しくは半透明の熱
可塑性樹脂からなり、内周面には電熱線が埋設されるエ
レクトロフュージョン継手との融着接合に用いる熱可塑
性樹脂管であって、少なくとも継手と接する管外周面に
は、その一部又は全体に継手に混入される化合物と反応
すると発色ないし変色する化合物が混入される熱可塑性
樹脂管。12. A thermoplastic resin tube which is used for fusion bonding with an electrofusion joint in which a part or the whole is made of a transparent or translucent thermoplastic resin and an electric heating wire is embedded in the inner peripheral surface, A thermoplastic resin tube in which a compound that develops or changes color when reacted with a compound mixed in the joint is mixed in a part or the whole of the outer peripheral surface of the tube that is in contact with the joint.
JP8033272A 1996-02-21 1996-02-21 Electrofusion coupling and thermoplastic resin pipe Pending JPH09229281A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8033272A JPH09229281A (en) 1996-02-21 1996-02-21 Electrofusion coupling and thermoplastic resin pipe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8033272A JPH09229281A (en) 1996-02-21 1996-02-21 Electrofusion coupling and thermoplastic resin pipe

Publications (1)

Publication Number Publication Date
JPH09229281A true JPH09229281A (en) 1997-09-05

Family

ID=12381903

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8033272A Pending JPH09229281A (en) 1996-02-21 1996-02-21 Electrofusion coupling and thermoplastic resin pipe

Country Status (1)

Country Link
JP (1) JPH09229281A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100343527B1 (en) * 1999-10-04 2002-07-19 주식회사 미진비앤피 Fusion coupler
JP2008111459A (en) * 2006-10-30 2008-05-15 Maezawa Kyuso Industries Co Ltd Electromagnetic fusion joint
GB2510145A (en) * 2013-01-25 2014-07-30 Radius Systems Ltd An electrofusion fitting

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100343527B1 (en) * 1999-10-04 2002-07-19 주식회사 미진비앤피 Fusion coupler
JP2008111459A (en) * 2006-10-30 2008-05-15 Maezawa Kyuso Industries Co Ltd Electromagnetic fusion joint
GB2510145A (en) * 2013-01-25 2014-07-30 Radius Systems Ltd An electrofusion fitting

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