JP3569565B2 - 電気融着継手 - Google Patents

電気融着継手 Download PDF

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Publication number
JP3569565B2
JP3569565B2 JP11865995A JP11865995A JP3569565B2 JP 3569565 B2 JP3569565 B2 JP 3569565B2 JP 11865995 A JP11865995 A JP 11865995A JP 11865995 A JP11865995 A JP 11865995A JP 3569565 B2 JP3569565 B2 JP 3569565B2
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Japan
Prior art keywords
density
density polyethylene
polyethylene resin
peripheral surface
joint
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JP11865995A
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JPH08312868A (ja
Inventor
敏郎 横幕
隆一郎 中村
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Mitsubishi Plastics Inc
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Mitsubishi Plastics Inc
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    • 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
    • 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
    • B29C66/11—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
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • B29C66/712—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined the composition of one of the parts to be joined being different from the composition of the other part
    • 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

Description

【０００１】
【産業上の利用分野】
本発明は、継手本体の受口内周面に電熱線を埋設した電気融着継手に関し、詳しくは一方が高密度又は中密度のポリエチレン管と、他方が低密度のポリエチレン管とを接続する際に好適に使用できる電気融着継手に関する。
【０００２】
【従来の技術】
従来からガス管や給水・給湯管等の接続には、合成樹脂製継手本体の両端部に受口を設け、それぞれの受口内周面に電熱線を螺旋状に埋設した電気融着継手が使用されている。
【０００３】
【発明が解決しようとする課題】
ところで、ガス管や給水・給湯管には、ポリエチレン管が使用されているが、このポリエチレン管には高密度、中密度、低密度のポリエチレン樹脂からなる管が存在するため、従来の電気融着継手は種類が異なるポリエチレン管同志の接続には使用できなかった。例えば、高密度のポリエチレン管同志の接続には、継手本体を高密度のポリエチレン樹脂で形成した電気融着継手が使用されるが、この電気融着継手は高密度のポリエチレン管と低密度のポリエチレン管の接続には使用できなかった。
本発明はかかる課題を解決したものであって、種類の異なるポリエチレン管同志を確実、かつ強固に融着接合できる電気融着継手を提供するものである。
【０００４】
【課題を解決するための手段】
本発明の電気融着継手は、ポリエチレン樹脂で円筒状の継手本体を形成し、該継手本体の両端部に受口を設けると共に、それぞれの受口内周面に電熱線を螺旋状に埋設したものであって、前記電熱線が埋設された一方の受口内周面に高密度又は中密度のポリエチレン樹脂層を形成すると共に、他方の受口内周面に低密度のポリエチレン樹脂層を形成したことを特徴とする。
【０００５】
【作用】
配管施工の際に、継手本体の一方の受口に高密度又は中密度のポリエチレン管を挿入し、他方の受口に低密度のポリエチレン管を挿入する。そこで、それぞれの受口内周面に埋設した電熱線に通電して発熱させると、一方の受口内周面に形成した高密度又は中密度のポリエチレン樹脂層と高密度又は中密度ポリエチレン管の外周面とが溶融して融着接合し、他方の受口内周面に形成した低密度のポリエチレン樹脂層と低密度ポリエチレン管の外周面とが溶融して融着接合する。
また、継手本体を高密度又は中密度のポリエチレン樹脂で形成すると、耐摩耗性，耐衝撃性等の機械的強度が向上する。
【０００６】
【実施例】
以下、本発明の実施例を図面にて詳細に説明する。
図１は本発明の一実施例を示す電気融着継手の半断面図、図２は本発明の他の実施例を示す電気融着継手とその製造工程の断面図であって、図中１はポリエチレン樹脂からなる継手本体、１ａは高密度又は中密度ポリエチレン樹脂層、１ｂは低密度のポリエチレン樹脂層、２は電熱線である。
【０００７】
まず、図１に示した電気融着継手について説明する。この電気融着継手は、ポリエチレン樹脂で円筒状の継手本体１を形成し、該継手本体１の両端部に受口１１を設けると共に、それぞれの受口１１の内周面に裸の電熱線２を螺旋状に埋設したものであって、一方の受口１１の内周面には高密度又は中密度のポリエチレン樹脂層１ａが形成され、他方の受口１１の内周面には低密度のポリエチレン樹脂層１ｂが形成されている。
【０００８】
前記電熱線２は、継手本体１の径サイズに応じて線径が０．２ｍｍ〜３．０ｍｍのニクロム線等が使用でき、螺旋状に巻回された電熱線２の間隔は０．５ｍｍ〜３．０ｍｍの範囲で適宜設定することができる。また、継手本体１の両端外周には一対の端子ピン３が突出しており、それぞれの端子ピン３に電熱線２の両端部が接続している。
【０００９】
この電気融着継手は射出成形によって一体成形されるものである。
この一例として、高密度又は中密度のポリエチレン樹脂層１ａを構成する円筒体と、低密度のポリエチレン樹脂層１ｂを構成する円筒体とを準備し、それぞれの円筒体の外周面に刻設した螺旋溝に裸の電熱線２を嵌合して金型内にセットしてから溶融樹脂を射出して製造することができる。尚、この実施例の場合、継手本体１を構成するポリエチレン樹脂は、高密度，中密度あるいは低密度のいずれのポリエチレン樹脂であってもよい。また、継手本体１は図示したソケットに限らずエルボとすることもでき、継手本体１の端部外周にはポリエチレン樹脂層１ａ，１ｂの密度に合わせてＨ，Ｍ，Ｌ等の表示をしておくとよい。
【００１０】
次に、本発明の他の実施例である電気融着継手とその製法を図２に基づいて説明する。この電気融着継手は、一方の受口１１の内周面に電熱線２の外面が高密度又は中密度のポリエチレン樹脂層１ａで外面被覆されたものを埋設し、また他方の受口１１の内周面に電熱線２の外面が低密度のポリエチレン樹脂層１ｂで外面被覆されたものを埋設したものである。
【００１１】
この電気融着継手の製造に際しては、まずコア４の外周面にそれぞれの樹脂層１ａ、１ｂで外面被覆れた電熱線２を巻回する。尚、図中のＡは双方の電熱線２を接続する継手である。次に、電熱線２を巻回したコア４を半割状の金型５内にセットすると共に、それぞれの電熱線２の端部に接続した端子ピン３を端子保持部材６で保持しつつ金型５を型閉めする。
【００１２】
そこで、コア４と金型５の間に形成したキャビテイに溶融樹脂を射出して硬化させると、継手本体１の両端部に電熱線２が埋設された受口１１が形成され、一方の受口１１の内周面に高密度又は中密度のポリエチレン樹脂層１ａが形成されると共に、他方の受口１１の内周面に低密度のポリエチレン樹脂層１ｂが形成された電気融着継手が得られる。尚、この実施例の場合も、継手本体１を構成するポリエチレン樹脂は、高密度，中密度あるいは低密度のいずれのポリエチレン樹脂であってもよい
【００１３】
この電気融着継手を用いてポリエチレン管同志を接続する場合、継手本体１の一方の受口１１に高密度又は中密度のポリエチレン管を挿入し、他方の受口１１に低密度のポリエチレン管を挿入する。そこで、それぞれの受口１１の内周面に埋設した電熱線２に通電して発熱させると、一方の受口１１の内周面に形成した高密度又は中密度のポリエチレン樹脂層１ａとこの受口１１に挿入された高密度又は中密度ポリエチレン管の外周面とが溶融して融着接合し、他方の受口１１の内周面に形成した低密度のポリエチレン樹脂層１ｂとこの受口１１に挿入された低密度ポリエチレン管の外周面とが溶融して強固に融着接合する。
【００１４】
【発明の効果】
以上詳述した如く、本発明の電気融着継手は、一方の受口内周面に高密度又は中密度のポリエチレン樹脂層を形成すると共に、他方の受口内周面に低密度のポリエチレン樹脂層を形成したので、種類の異なるポリエチ管同志を確実かつ強固に融着接合することができる。
また、継手本体を高密度又は中密度のポリエチレン樹脂で形成すると機械的強度が向上するので、現場での配管施工の際、又は施工後に継手部に作用する振動・衝撃等によって電気融着継手が破損して管内流体が漏洩することもない。
【図面の簡単な説明】
【図１】図１は本発明の一実施例を示す電気融着継手の半断面図である。
【図２】図２は本発明の他の実施例の電気融着継手とその製造工程の断面図である。
【符号の説明】
１ 継手本体
１ａ 高密度又は中密度のポリエチレン樹脂層
１ｂ 低密度のポリエチレン樹脂層
２ 電熱線
３ 端子ピン

Claims (2)

  1. ポリエチレン樹脂で円筒状の継手本体を形成し、該継手本体の両端部に受口を設けると共に、それぞれの受口内周面に電熱線を螺旋状に埋設した電気融着継手であって、前記電熱線が埋設された一方の受口内周面に高密度又は中密度のポリエチレン樹脂層を形成すると共に、他方の受口内周面に低密度のポリエチレン樹脂層を形成したことを特徴とする電気融着継手。
  2. 継手本体を高密度又は中密度のポリエチレン樹脂で形成したことを特徴とする請求項１記載の電気融着継手。
JP11865995A 1995-05-17 1995-05-17 電気融着継手 Expired - Lifetime JP3569565B2 (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11865995A JP3569565B2 (ja) 1995-05-17 1995-05-17 電気融着継手

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11865995A JP3569565B2 (ja) 1995-05-17 1995-05-17 電気融着継手

Publications (2)

Publication Number Publication Date
JPH08312868A JPH08312868A (ja) 1996-11-26
JP3569565B2 true JP3569565B2 (ja) 2004-09-22

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Publication number Publication date
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