JP2003042381A - Electric fusion joint - Google Patents

Electric fusion joint

Info

Publication number
JP2003042381A
JP2003042381A JP2001230694A JP2001230694A JP2003042381A JP 2003042381 A JP2003042381 A JP 2003042381A JP 2001230694 A JP2001230694 A JP 2001230694A JP 2001230694 A JP2001230694 A JP 2001230694A JP 2003042381 A JP2003042381 A JP 2003042381A
Authority
JP
Japan
Prior art keywords
joint
electric fusion
electric
fusion joint
resin
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
JP2001230694A
Other languages
Japanese (ja)
Inventor
Nobuyuki Watanabe
宣行 渡辺
Yutaka Kanisawa
裕 蟹沢
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.)
Proterial Ltd
Original Assignee
Hitachi Metals 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 Hitachi Metals Ltd filed Critical Hitachi Metals Ltd
Priority to JP2001230694A priority Critical patent/JP2003042381A/en
Publication of JP2003042381A publication Critical patent/JP2003042381A/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
    • 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
    • B29C66/124—Tongue and groove joints
    • B29C66/1244—Tongue and groove joints characterised by the male part, i.e. the part comprising the tongue
    • B29C66/12441—Tongue and groove joints characterised by the male part, i.e. the part comprising the tongue being a single wall
    • 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"
    • B29C65/3404—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
    • B29C65/3444—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 being a ribbon, band or strip
    • 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
    • B29C65/3484—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 non-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
    • B29C66/50—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
    • 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
    • B29C66/63—Internally supporting the article during joining
    • B29C66/636—Internally supporting the article during joining using a support which remains in the joined object
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined

Landscapes

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

Abstract

PROBLEM TO BE SOLVED: To provide a heating element capable of achieving an electric fusion joint having a superior fusion property with reduced man-hours. SOLUTION: A belt-shaped coil member comprising an electrical resistance material mainly constituted by tin oxide is used as a heating member of this electric fusion joint. The heating member mainly constituted by the tin oxide preferably contains an inorganic oxide.

Description

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

【０００１】[0001]

【発明の属する技術分野】本発明は、樹脂管を接合する
ための電気融着継手に関する。TECHNICAL FIELD The present invention relates to an electric fusion joint for joining resin pipes.

【０００２】[0002]

【従来の技術】ガスや水道の配管における樹脂管同士の
接合手段として、電気融着継手が使用されている。電気
融着継手は、螺旋状に巻回された電熱線（例えばＮｉ−
Ｃｒ線）を樹脂製の継手本体に埋め込んだ基本構造を有
する。管継手に樹脂管の端部を挿入した状態で電熱線に
通電することにより、管継手と樹脂管との境界面とその
近傍を溶融し、次いで溶融樹脂を冷却・固化することに
より、管継手と樹脂管とが溶融し、両者を一体化させる
ものである。この電気融着継手は、樹脂管と継手をセッ
ト後、樹脂管の外径や周囲温度などに応じて印加電圧、
通電時間等の施工条件を選定し、電熱線に一定の電力を
供給することにより、樹脂管同士を強固に接続できるも
のであり、高い信頼性を有する。2. Description of the Related Art An electric fusion joint is used as a means for joining resin pipes in gas or water pipes. The electric fusion-bonded joint is a heating wire (for example, Ni-) that is spirally wound.
It has a basic structure in which a Cr wire) is embedded in a resin-made joint body. By energizing the heating wire with the end of the resin pipe inserted in the pipe joint, the boundary surface between the pipe joint and the resin pipe and its vicinity are melted, and then the molten resin is cooled and solidified to form a pipe joint. And the resin pipe are melted, and both are integrated. This electric fusion joint, after setting the resin pipe and the joint, the applied voltage according to the outer diameter of the resin pipe and the ambient temperature,
By selecting construction conditions such as energization time and supplying a constant electric power to the heating wire, the resin pipes can be firmly connected to each other and have high reliability.

【０００３】[0003]

【発明が解決しようとする課題】電気融着継手として
は、熱可塑性樹脂からなり外周面に螺旋溝を形成しそこ
に巻回された電熱線を有するインナー（内筒）と、熱可
塑性樹脂からなりインナーを包囲するアウター（外筒）
を有するものが多用されている（例えば特許第２９６３
０８２号参照）。この電気融着継手は、インナーを成形
後その両端部にコネクターピンを装着し、コネクターピ
ンに電熱線の一端を接続し、電熱線をインナーに巻き付
け、巻き終わりをコネクターピンに接続し、次いでアウ
ターをインナーと一体的に成形するといった比較的多数
の工程を経て製作されている。また正常な融着部を得る
ために、電熱線の抵抗値を一定にすることが必要なの
で、電熱線に張力を印加しながら巻き付け作業を行うな
どの工夫が必要とされる。As an electric fusion-bonding joint, an inner (inner tube) made of a thermoplastic resin and having a spiral groove formed on the outer peripheral surface and having a heating wire wound around the spiral groove is formed from the thermoplastic resin. An outer (outer cylinder) that surrounds the inner
Is often used (for example, Japanese Patent No. 2963).
082). In this electrofusion joint, after molding the inner, attach connector pins to both ends, connect one end of the heating wire to the connector pin, wind the heating wire around the inner, connect the end of winding to the connector pin, then connect the outer It is manufactured through a relatively large number of steps such as molding the inner part with the inner part. Further, in order to obtain a normal fusion-bonded portion, it is necessary to make the resistance value of the heating wire constant, so that it is necessary to devise such as performing the winding work while applying tension to the heating wire.

【０００４】電気融着継手としては、上記の構造の他
に、円柱状マンドレルの外周面に熱可塑性樹脂で被覆さ
れた電熱線を巻回し、これを金型内に設置して成形空間
を形成し、そこに熱可塑性樹脂を射出成形して製作され
たものが使用されている（例えば特公平７−５１２９６
号参照）。しかしこの構造のものは、上記のものより製
作工数を短縮できるが、電熱線は互いに密着して巻回さ
れているので、樹脂管と継手を融着接合する際に被覆樹
脂の厚さが不均一となり、電熱線の短絡が生じ易く、融
着不良を招来するという問題がある。従って本発明の目
的は、従来よりも少ない工数で製作できしかも良好な融
着性能を有する電気融着継手を提供することである。In addition to the above-mentioned structure, the electric fusion splicing joint is formed by winding a heating wire coated with a thermoplastic resin around the outer peripheral surface of a cylindrical mandrel and installing it in a mold to form a molding space. However, those manufactured by injection-molding a thermoplastic resin are used (for example, Japanese Patent Publication No. 7-51296).
No.). However, with this structure, the number of manufacturing steps can be shortened compared to the above, but since the heating wires are wound in close contact with each other, the thickness of the coating resin must be constant when fusion-bonding the resin pipe and joint. There is a problem in that the heating wires become uniform, a short circuit of the heating wire is likely to occur, and defective fusion occurs. Therefore, an object of the present invention is to provide an electric fusion splicing joint which can be manufactured by a smaller number of steps than the conventional one and has a good fusion splicing performance.

【０００５】[0005]

【課題を解決するための手段】上記目的を達成するため
に、本発明者は、従来の電熱線の代わりに抵抗発熱体を
用いることを鋭意検討し、本発明に到達したものであ
る。即ち、本発明の電気融着継手は、樹脂製継手本体の
内部に発熱部材を有する電気融着継手において、前記発
熱部材として酸化スズを主体とする電気抵抗材料からな
る帯状コイル部材を用いることを特徴とすものである。
本発明の電気融着継手においては、発熱部材を容易に作
成するために、酸化スズを主体とする上記発熱部材は、
更に無機酸化物を含有することが好ましい。本発明の電
気融着継手においては、良好な融着部を得るために、継
手本体はポリオレフィンからなることが好ましく、特に
中密度ポリエチレンからなることが好ましい。In order to achieve the above object, the present inventor has earnestly studied to use a resistance heating element instead of the conventional heating wire, and arrived at the present invention. That is, the electric fusion joint of the present invention, in the electric fusion joint having a heat generating member inside the resin joint body, using a strip-shaped coil member made of an electric resistance material mainly containing tin oxide as the heat generating member, It is a feature.
In the electrofusion joint of the present invention, in order to easily create a heat generating member, the heat generating member mainly composed of tin oxide,
Further, it preferably contains an inorganic oxide. In the electric fusion-bonded joint of the present invention, in order to obtain a good fusion-bonded portion, the joint body is preferably made of polyolefin, particularly preferably medium-density polyethylene.

【０００６】[0006]

【発明の実施の形態】以下本発明の詳細を添付図面によ
り説明する。図１は本発明の電気融着継手の断面図、図
２は図１の発熱部材の平面図である。図１に示すよう
に、電気融着継手１は、熱可塑性樹脂からなる支持部材
２の外側に、熱可塑性樹脂からなる継手本体３を射出成
形して形成されている。支持部材２と継手本体３との間
に樹脂管（図示せず）の端部が挿入される。継手本体３
はその内部に埋め込まれた発熱部材４を有し、発熱部材
４の両端に端子ピン５が接続されている。発熱部材４は
電気抵抗により発熱する部材で、例えば融着継手の口径
が２５Ａで融着面積が約６０ｃｍ２の場合、単位面積当
たりの電力（４６Ｗ／ｃｍ２）を印加した時に、昇温時
間が５０〜９０秒で融着界面温度が約２２０℃に上昇す
るような電気特性を有するものが望ましい。このような
電気特性を満足する材料としては、例えば酸化スズ（Ｓ
ｎＯ2）を主体とし、必要に応じアルミナ（Ａｌ2Ｏ3）
やシリカ（ＳｉＯ2）等の無機充填材を配合した電気抵
抗材料がある。発熱部材４はこの電気抵抗材料を用いて
成形された帯状のコイル部材である。DETAILED DESCRIPTION OF THE INVENTION The details of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a sectional view of the electric fusion joint of the present invention, and FIG. 2 is a plan view of the heat generating member of FIG. As shown in FIG. 1, the electrofusion joint 1 is formed by injection molding a joint body 3 made of a thermoplastic resin on the outside of a support member 2 made of a thermoplastic resin. An end portion of a resin pipe (not shown) is inserted between the support member 2 and the joint body 3. Joint body 3
Has a heat generating member 4 embedded therein, and terminal pins 5 are connected to both ends of the heat generating member 4. The heat-generating member 4 is a member that generates heat due to electric resistance. For example, when the diameter of the fusion-bonding joint is 25 A and the fusion-bonding area is approximately 60 cm 2, the heating time is 50 when applying electric power per unit area (46 W / cm 2). It is desirable to have electrical characteristics such that the fusion interface temperature rises to about 220 ° C. in about 90 seconds. As a material satisfying such electrical characteristics, for example, tin oxide (S
nO 2 ) as the main component, if necessary alumina (Al 2 O 3 )
There is an electric resistance material containing an inorganic filler such as silica and silica (SiO 2 ). The heat generating member 4 is a strip-shaped coil member formed by using this electric resistance material.

【０００７】上記継手本体３は、例えば、ポリオレフィ
ン（ポリエチレン、ポリプロピレン等）、ポリブテンな
どの公知の熱可塑性樹脂で形成し得るが、融着境界面を
所定の厚さに維持するために、これらの樹脂の内では、
ポリエチレン、特に中密度ポリエチレンが望ましい。The joint body 3 may be formed of a known thermoplastic resin such as polyolefin (polyethylene, polypropylene, etc.), polybutene, etc. Within the resin,
Polyethylene, especially medium density polyethylene, is preferred.

【０００７】上記の例では、継手本体の内側に支持部材
を有する継手について説明したが、本発明はこれに限定
されず、支持部材を持たない継手に適用することがで
き、またソケット、分岐サドル、チーズ、レデューサ
ー、ベント等各種形状の継手に適用できることはもちろ
んである。In the above example, the joint having the support member inside the joint body has been described, but the present invention is not limited to this, and can be applied to a joint having no support member, and the socket and the branch saddle. Of course, it can be applied to joints of various shapes such as cheese, reducer, and vent.

【０００８】[0008]

【発明の効果】以上に記述の如く、本発明によれば、発
熱部材として、特定の電気抵抗材料からなる帯状コイル
部材を用いるので、少ない工数でしかも良好な融着部が
得られる電気融着継手を実現することができる。As described above, according to the present invention, since the strip-shaped coil member made of a specific electric resistance material is used as the heat-generating member, the electric fusion can be obtained with a small number of steps and a good fusion portion. A joint can be realized.

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

【図１】 本発明の一実施例に係わる電気融着継手の断
面図である。FIG. 1 is a sectional view of an electric fusion joint according to an embodiment of the present invention.

【図２】 図１の発熱部材の平面図である。FIG. 2 is a plan view of the heat generating member of FIG.

【符号の説明】[Explanation of symbols]

１：継手 ２：支持部材 ３：継手本体 ４：発熱部材 1: Joint 2: Support member 3: Fitting body 4: Heating element

Claims (4)

【特許請求の範囲】[Claims] 【請求項１】 樹脂製継手本体の内部に発熱部材を有す
る電気融着継手において、前記発熱部材として酸化スズ
を主体とする電気抵抗材料からなる帯状コイル部材を用
いたことを特徴とする電気融着式管継手。1. An electrofusion joint having a heat-generating member inside a resin joint body, wherein a strip-shaped coil member made of an electric resistance material mainly containing tin oxide is used as the heat-generating member. Wearable pipe fittings. 【請求項２】 前記発熱体は無機酸化物を含有すること
を特徴とする請求項１記載の電気融着継手。2. The electric fusion joint according to claim 1, wherein the heating element contains an inorganic oxide. 【請求項３】 前記継手本体は、ポリオレフィンからな
ることを特徴とする請求項２記載の電気融着継手。3. The electric fusion joint according to claim 2, wherein the joint body is made of polyolefin. 【請求項４】 前記継手本体は、中密度ポリエチレンか
らなることを特徴とする請求項３記載の電気融着継手。4. The electric fusion joint according to claim 3, wherein the joint body is made of medium density polyethylene.
JP2001230694A 2001-07-31 2001-07-31 Electric fusion joint Pending JP2003042381A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2001230694A JP2003042381A (en) 2001-07-31 2001-07-31 Electric fusion joint

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2001230694A JP2003042381A (en) 2001-07-31 2001-07-31 Electric fusion joint

Publications (1)

Publication Number Publication Date
JP2003042381A true JP2003042381A (en) 2003-02-13

Family

ID=19062862

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2001230694A Pending JP2003042381A (en) 2001-07-31 2001-07-31 Electric fusion joint

Country Status (1)

Country Link
JP (1) JP2003042381A (en)

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