JPH05172289A - Electric fusion attach pipe fitting and manufacture thereof - Google Patents

Electric fusion attach pipe fitting and manufacture thereof

Info

Publication number
JPH05172289A
JPH05172289A JP3344464A JP34446491A JPH05172289A JP H05172289 A JPH05172289 A JP H05172289A JP 3344464 A JP3344464 A JP 3344464A JP 34446491 A JP34446491 A JP 34446491A JP H05172289 A JPH05172289 A JP H05172289A
Authority
JP
Japan
Prior art keywords
thermoplastic resin
electric fusion
adhesive layer
layer
joint
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
JP3344464A
Other languages
Japanese (ja)
Inventor
Akihiko Sato
明彦 佐藤
Shigeru Ando
茂 安藤
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.)
Sekisui Chemical Co Ltd
Original Assignee
Sekisui Chemical Co 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 Sekisui Chemical Co Ltd filed Critical Sekisui Chemical Co Ltd
Priority to JP3344464A priority Critical patent/JPH05172289A/en
Publication of JPH05172289A publication Critical patent/JPH05172289A/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
    • B29C66/50—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
    • 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
    • B29C66/01—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
    • B29C66/114—Single butt joints
    • B29C66/1142—Single butt to butt 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
    • B29C66/01—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
    • B29C66/01—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
    • 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
    • B29C66/1246—Tongue and groove joints characterised by the female part, i.e. the part comprising the groove
    • B29C66/12469—Tongue and groove joints characterised by the female part, i.e. the part comprising the groove being asymmetric
    • 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
    • B29C66/50—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
    • 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
    • B29C66/70—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

Abstract

PURPOSE:To provide an electric fusion attachment joint which generates connection with a resin pipe in certainly water stopped condition and establish a method of manufacturing such joint. CONSTITUTION:An electric fusion attachment joint 1 is structured by providing a bridging thermoplastic resin layer 5 over the periphery of a thermoplastic resin cylinder 3 fitted with heat emitting bodies 2, wherein an adhesive layer 4 made from denatured polymer of thermoplastic resin is furnished between the cylinder 3 and the layer 5.

Description

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

【０００１】[0001]

【産業上の利用分野】本発明は、通電によって発熱する
コイルや高周波磁場により発熱する磁性体などの発熱体
が埋設された熱可塑性樹脂円筒体の外周に、架橋性熱可
塑性樹脂層が設けられた電気融着継手に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a crosslinkable thermoplastic resin layer on the outer periphery of a thermoplastic resin cylinder in which a heating element such as a coil which generates heat when energized or a magnetic body which generates heat by a high frequency magnetic field is embedded. It also relates to an electric fusion joint.

【０００２】[0002]

【従来の技術】一般に、通電によって発熱するコイルが
埋設された熱可塑性樹脂からなる電気融着継手が知られ
ている。2. Description of the Related Art Generally, an electric fusion-bonding joint made of a thermoplastic resin in which a coil which generates heat when energized is embedded is known.

【０００３】そして、従来より、この電気融着継手の熱
可塑性樹脂に、架橋熱可塑性樹脂を複合して耐熱性に優
れた電気融着継手とすることが提案されている。すなわ
ち、この電気融着継手は、発熱するコイルが埋設された
熱可塑性樹脂の成形体を射出成形型にインサートした状
態で、該熱可塑性樹脂の成形体の表面に、架橋性の未架
橋熱可塑性樹脂を射出成形して積層一体化した後、該未
架橋熱可塑性樹脂を架橋させることによって製造される
（例えば、特開平２−２５３０９１号公報参照）。In the past, it has been proposed to combine a thermoplastic resin of this electric fusion joint with a crosslinked thermoplastic resin to form an electric fusion joint having excellent heat resistance. That is, this electrofusion joint is a non-crosslinking thermoplastic resin having a crosslinkable property on the surface of the thermoplastic resin molded body in a state where the thermoplastic resin molded body in which the heat generating coil is embedded is inserted into the injection molding die. The resin is injection-molded to be laminated and integrated, and then the uncrosslinked thermoplastic resin is crosslinked (see, for example, JP-A-2-253091).

【０００４】[0004]

【発明が解決しようとする課題】しかし、上記従来の電
気融着継手の場合、すでに硬化状態となされた熱可塑性
樹脂の成形体に、溶融状態となされた架橋性の未架橋熱
可塑性樹脂を積層一体化するため、積層一体化した後、
該未架橋熱可塑性樹脂を架橋硬化させても、熱可塑性樹
脂層と架橋熱可塑性樹脂層とが完全に一体化しないとい
った不都合を生じることとなる。However, in the case of the above-mentioned conventional electric fusion joint, however, a crosslinked uncrosslinked thermoplastic resin in a molten state is laminated on a molded body of a thermoplastic resin which has been already in a cured state. In order to integrate, after stacking and integrating
Even if the non-crosslinked thermoplastic resin is crosslinked and cured, there arises a disadvantage that the thermoplastic resin layer and the crosslinked thermoplastic resin layer are not completely integrated.

【０００５】また、電気融着時にコイルに通電して熱可
塑性樹脂層を溶融させても、該熱可塑性樹脂層は、一旦
架橋してしまった架橋熱可塑性樹脂層と溶融一体化しな
い。その結果、この熱可塑性樹脂層と架橋熱可塑性樹脂
層との間に水みちが形成され、この電気融着継手と、該
電気融着継手に接続された樹脂管との接続が不十分とな
り、漏水を生じることとなる。Further, even when the coil is energized to melt the thermoplastic resin layer at the time of electric fusion, the thermoplastic resin layer does not melt-integrate with the crosslinked thermoplastic resin layer which has been once crosslinked. As a result, a water groove is formed between the thermoplastic resin layer and the crosslinked thermoplastic resin layer, and the electric fusion joint is insufficiently connected to the resin pipe connected to the electric fusion joint, Water leakage will occur.

【０００６】本発明は、係る実情に鑑みてなされたもの
で、確実な止水状態で樹脂管と接続することのできる電
気融着継手およびその製造方法を提供することを目的と
している。The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an electric fusion joint which can be connected to a resin pipe in a reliable water-sealing state, and a manufacturing method thereof.

【０００７】[0007]

【課題を解決するための手段】上記課題を解決するため
の請求項１記載の電気融着継手は、発熱体を有する熱可
塑性樹脂円筒体の外周に、架橋熱可塑性樹脂層が設けら
れた電気融着継手であって、前記熱可塑性樹脂円筒体と
架橋熱可塑性樹脂層との間に、該熱可塑性樹脂の変性ポ
リマーによる接着層が設けられたものである。According to a first aspect of the present invention, there is provided an electric fusion splicing joint, wherein a thermoplastic resin cylindrical body having a heating element is provided with a crosslinked thermoplastic resin layer on the outer periphery thereof. It is a fusion-bonding joint, in which an adhesive layer made of a modified polymer of the thermoplastic resin is provided between the thermoplastic resin cylinder and the crosslinked thermoplastic resin layer.

【０００８】また、上記課題を解決するための請求項２
記載の電気融着継手は、発熱体を有する熱可塑性樹脂円
筒体の外周に、架橋熱可塑性樹脂層が設けられた電気融
着継手であって、前記熱可塑性樹脂円筒体と架橋熱可塑
性樹脂層との間に、前記熱可塑性樹脂円筒体と同材質の
熱可塑性樹脂による接着層が設けられ、この接着層は、
成形直後の高温状態から前記架橋熱可塑性樹脂層ととも
に冷却されて両層間が接着されているものである。A second aspect of the present invention for solving the above problems.
The electric fusion joint described is an electric fusion joint in which a cross-linked thermoplastic resin layer is provided on the outer periphery of a thermoplastic resin cylinder having a heating element, wherein the thermoplastic resin cylinder and the cross-linked thermoplastic resin layer. An adhesive layer made of a thermoplastic resin of the same material as the thermoplastic resin cylinder is provided between the adhesive layer and
The two layers are bonded together by being cooled together with the crosslinked thermoplastic resin layer from a high temperature state immediately after molding.

【０００９】さらに、上記課題を解決するための請求項
３記載の電気融着継手の製造方法は、発熱体を有する熱
可塑性樹脂円筒体の外表面に、該円筒体と同材質の熱可
塑性樹脂を射出して接着層を成形し、この接着層が成形
直後の高温状態にあるうちに、該接着層の外表面に、架
橋性を有する熱可塑性樹脂を射出して冷却硬化させるも
のである。Further, in order to solve the above-mentioned problems, a method for manufacturing an electric fusion joint according to a third aspect of the present invention is characterized in that a thermoplastic resin of the same material as the cylindrical body is formed on the outer surface of the thermoplastic resin cylinder having a heating element. Is injected to mold an adhesive layer, and while the adhesive layer is in a high temperature state immediately after molding, a thermoplastic resin having a crosslinkability is injected onto the outer surface of the adhesive layer to be cooled and cured.

【００１０】[0010]

【作用】請求項１記載の電気融着継手によると、熱可塑
性樹脂円筒体と架橋熱可塑性樹脂層との間に、該熱可塑
性樹脂の変性ポリマーによる接着層を設けているので、
熱可塑性樹脂円筒体と架橋熱可塑性樹脂層とが、この変
性ポリマーを介して一体化することとなる。According to the electric fusion-bonding joint of claim 1, since an adhesive layer made of a modified polymer of the thermoplastic resin is provided between the thermoplastic resin cylinder and the crosslinked thermoplastic resin layer,
The thermoplastic resin cylinder and the crosslinked thermoplastic resin layer will be integrated via this modified polymer.

【００１１】また、請求項２記載の電気融着継手による
と、成形直後の高温状態から架橋熱可塑性樹脂層ととも
に冷却された接着層を設けているので、この接着層の熱
可塑性樹脂と架橋熱可塑性樹脂層とは、硬化状態で一体
化したものとなる。そして、接着層は、熱可塑性樹脂円
筒体と同材質の熱可塑性樹脂としているので、融着時に
発熱体を発熱させて熱可塑性樹脂円筒体を加熱溶融させ
ると、この熱可塑性樹脂円筒体とともに、該熱可塑性樹
脂円筒体の近傍の接着層が溶融することとなり、冷却後
はこの熱可塑性樹脂円筒体と接着層とが一体化すること
となる。Further, according to the electric fusion joint of the second aspect, since the adhesive layer cooled together with the crosslinked thermoplastic resin layer is provided from the high temperature state immediately after molding, the thermoplastic resin of the adhesive layer and the crosslinkable thermoplastic resin are provided. It is integrated with the plastic resin layer in a cured state. Since the adhesive layer is made of the same thermoplastic resin as the thermoplastic resin cylinder, the heating element is heated during fusion to heat and melt the thermoplastic resin cylinder, together with the thermoplastic resin cylinder, The adhesive layer near the thermoplastic resin cylinder melts, and after cooling, the thermoplastic resin cylinder and the adhesive layer are integrated.

【００１２】さらに、請求項３記載の電気融着継手の製
造方法によると、発熱体を有する熱可塑性樹脂円筒体の
外表面に、該円筒体と同材質の熱可塑性樹脂を射出して
接着層を成形し、この接着層が成形直後の高温状態にあ
るうちに該接着層の外表面に、架橋熱可塑性樹脂を射出
するので、接着層と架橋熱可塑性樹脂とが、溶融状態で
互いに接触することとなる。そして、この状態から一緒
に硬化して一体化することとなる。Further, according to the method of manufacturing an electric fusion joint according to claim 3, a thermoplastic resin of the same material as the cylindrical body is injected onto the outer surface of the thermoplastic resin cylindrical body having a heating element to form an adhesive layer. Since the crosslinked thermoplastic resin is injected onto the outer surface of the adhesive layer while the adhesive layer is in a high temperature state immediately after molding, the adhesive layer and the crosslinked thermoplastic resin are in contact with each other in a molten state. It will be. Then, from this state, they are cured together and integrated.

【００１３】[0013]

【実施例】以下、本発明の一実施例を図面を参照して説
明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

【００１４】[0014]

【実施例１】図１は、電気融着継手１の全体構成の概略
を示している。[Embodiment 1] FIG. 1 schematically shows the overall structure of an electric fusion joint 1.

【００１５】すなわち、この電気融着継手１は、通電に
よって発熱するコイル２を有する熱可塑性樹脂の円筒体
３の外表面に、該熱可塑性樹脂の変性ポリマーを塗布し
て接着層４を形成し、この接着層４を介して円筒体３の
外表面に、架橋熱可塑性樹脂の被覆層５を形成したもの
である。That is, in this electric fusion-bonding joint 1, an adhesive layer 4 is formed by applying a modified polymer of the thermoplastic resin to the outer surface of a cylindrical body 3 of the thermoplastic resin having a coil 2 which generates heat when energized. A coating layer 5 of a crosslinked thermoplastic resin is formed on the outer surface of the cylindrical body 3 via the adhesive layer 4.

【００１６】円筒体３は、ポリエチレンなどの非架橋性
の熱可塑性ポリオレフィン系の樹脂によって円筒状に形
成されてなり、その内部には、コイル２が螺旋状に埋設
されている。この円筒体３は、金型（図示省略）内にコ
イル２をあらかじめセットしておき、該金型（図示省
略）内に熱可塑性樹脂を射出成形することによって成形
することができる。The cylindrical body 3 is formed of a non-crosslinking thermoplastic polyolefin resin such as polyethylene into a cylindrical shape, and the coil 2 is spirally embedded inside the cylindrical body 3. The cylindrical body 3 can be molded by setting the coil 2 in a mold (not shown) in advance and injection molding a thermoplastic resin in the mold (not shown).

【００１７】なお、円筒体３の成形方法としては、この
ような成形方法に限定されるものではなく、例えば、図
２に示すように、外周面に溝部３１を有する円筒体３２
を成形しておき、その溝部３１内にコイル２を嵌め込ん
で形成したものであってもよいし（図２(a) 参照）、外
周面に熱可塑性樹脂３３が被覆されたコイル２を円筒状
に巻回して円筒体３４としてもよい（図２(b) 参照）。The method for molding the cylindrical body 3 is not limited to this type of molding method. For example, as shown in FIG. 2, the cylindrical body 32 having the groove portion 31 on the outer peripheral surface thereof.
Alternatively, the coil 2 may be formed by inserting the coil 2 into the groove 31 (see FIG. 2 (a)), and the coil 2 having the outer peripheral surface coated with the thermoplastic resin 33 may be formed into a cylindrical shape. It may be wound into a cylindrical shape 34 (see FIG. 2 (b)).

【００１８】また、円筒体３は、本実施例のように、通
電によって発熱するコイル２が埋設されたものに限定さ
れるものではなく、例えば、熱可塑性樹脂の材料中に、
誘電性のある金属粉を混入した円筒体３５を成形し、該
円筒体３５自身に誘電性を持たせたものであってもよい
（図２(c) 参照）。この場合、円筒体３５の外部から、
高周波磁場を加えるといったいわゆる誘導加熱によっ
て、該円筒体３５を加熱溶融させることができる。同じ
く、誘電性を有する金網２０を埋設して成形した円筒体
３６であっても（図２(d) 参照）、この誘電加熱を行う
ことができる。Further, the cylindrical body 3 is not limited to the one in which the coil 2 which generates heat when energized is embedded, as in the present embodiment. For example, in the material of thermoplastic resin,
It is also possible to form a cylindrical body 35 in which dielectric metal powder is mixed and to impart dielectric properties to the cylindrical body 35 itself (see FIG. 2 (c)). In this case, from the outside of the cylindrical body 35,
The cylindrical body 35 can be heated and melted by so-called induction heating such as applying a high frequency magnetic field. Similarly, this dielectric heating can be performed even with the cylindrical body 36 formed by embedding the wire net 20 having a dielectric property (see FIG. 2D).

【００１９】さらに、円筒体３中に埋設されるコイル２
は、１本の線状となされたコイル２を螺旋状に巻回した
状態で埋設してもよいし、複数本の独立したリング状の
コイル２を個々に埋設してもよい。ただし、誘導加熱に
よって発熱するコイル２の場合は、各コイル２の端部
は、外部に導出させずに完全に埋設してもよいが、通電
によって発熱するコイル２の場合は、各コイル２の端部
を円筒体３の外部に導出可能な状態で埋設しておかなけ
ればならない。Further, the coil 2 embedded in the cylindrical body 3
May be embedded in a state where one linear coil 2 is spirally wound, or a plurality of independent ring-shaped coils 2 may be embedded individually. However, in the case of the coils 2 that generate heat by induction heating, the ends of each coil 2 may be completely buried without being led out to the outside. The end portion must be embedded outside the cylindrical body 3 so that it can be led out.

【００２０】接着層４は、前記円筒体３を構成する熱可
塑性樹脂の変性ポリマーを、該円筒体３の外表面に塗布
することによって形成することができる。この接着層４
を形成する変性ポリマーの具体的なものとしては、例え
ば、ダウケミカル社のプリマコール（商品名）や武田薬
品のタケメルト（商品名）、デュミラン（商品名）など
を挙げることができる。The adhesive layer 4 can be formed by applying a modified polymer of the thermoplastic resin forming the cylindrical body 3 to the outer surface of the cylindrical body 3. This adhesive layer 4
Specific examples of the modified polymer that forms the polymer include Primacol (trade name) of Dow Chemical Co., Takemelt (trade name) and Dumilan (trade name) of Takeda Pharmaceutical Co., Ltd.

【００２１】被覆層５は、架橋ポリエチレンなどの架橋
性の熱可塑性ポリオレフィン系の樹脂によって、接着層
４の形成された円筒体３の外表面を被覆することで形成
される。この被覆層５は、金型（図示省略）内に接着層
４の形成された円筒体３をセットしておき、該金型（図
示省略）内に架橋熱可塑性樹脂を射出成形することによ
って成形することができる。The coating layer 5 is formed by coating the outer surface of the cylindrical body 3 on which the adhesive layer 4 is formed with a crosslinkable thermoplastic polyolefin resin such as crosslinked polyethylene. The coating layer 5 is formed by setting the cylindrical body 3 on which the adhesive layer 4 is formed in a mold (not shown) and injecting a crosslinked thermoplastic resin into the mold (not shown). can do.

【００２２】このようになる電気融着継手１は、該電気
融着継手１の内周面に樹脂管６を嵌合した状態で、該樹
脂管６が円筒体３の部分と嵌合することとなる。そし
て、この状態でコイル３に通電すると、熱可塑性樹脂で
形成されている円筒体３の部分と樹脂管６とが溶融し、
融着接続されることとなる。接続後の電気融着継手１
は、架橋熱可塑性樹脂によって成形されている被覆層５
が耐熱性に優れているので、温水用の樹脂管６の接続継
手として好適に用いることができる。また、変性ポリマ
ーからなる接着層４によって、円筒体３と被覆層５とが
強固に一体化することとなるので、円筒体３と被覆層５
との間に水みちが形成されることなく止水性も充分に確
保することができる。In the electric fusion-bonding joint 1 thus configured, the resin pipe 6 is fitted to the cylindrical body 3 in a state where the resin pipe 6 is fitted to the inner peripheral surface of the electric fusion-bonding joint 1. Becomes When the coil 3 is energized in this state, the portion of the cylindrical body 3 formed of the thermoplastic resin and the resin pipe 6 are melted,
It will be fusion-bonded. Electric fusion splicer 1 after connection
Is a coating layer 5 formed of a crosslinked thermoplastic resin.
Since it has excellent heat resistance, it can be suitably used as a connection joint for the resin pipe 6 for hot water. Further, since the cylindrical body 3 and the coating layer 5 are firmly integrated by the adhesive layer 4 made of the modified polymer, the cylindrical body 3 and the coating layer 5 are integrated.
Water tightness can be sufficiently secured without the formation of a water gap between and.

【００２３】なお、本実施例では、電気融着継手１の内
周面の全体に配置するようになされた１個の円筒体３に
よって電気融着継手１を構成しているが、図３に示すよ
うに、２個の円筒体３を、電気融着継手１の両端側にぞ
れぞれ別個に配置するように構成してもよいし（図３
(a) 参照）、両端側から嵌合される樹脂管６を案内する
ように、樹脂管６の内周面に当接する案内管５０を、被
覆層５と同時に架橋熱可塑性樹脂で成形してもよい（図
３(b) 参照）。In this embodiment, the electric fusion-bonding joint 1 is composed of one cylindrical body 3 arranged on the entire inner peripheral surface of the electric fusion-bonding joint 1. As shown, the two cylindrical bodies 3 may be arranged separately on both ends of the electrofusion joint 1 (see FIG. 3).
(See (a)), so that the guide tube 50 that abuts the inner peripheral surface of the resin pipe 6 is molded with the cross-linking thermoplastic resin at the same time as the coating layer 5 so as to guide the resin pipe 6 fitted from both ends. It is good (see Figure 3 (b)).

【００２４】また、本実施例のように、両端側から樹脂
管６を嵌合して電気融着するようになされた電気融着継
手１に限定されるものではなく、一端側のみが電気融着
するようになされており、他端側に金属製のオス螺子も
しくはメス螺子がインサート成形された継手、その他各
種接続手段が施された電気融着継手（図示省略）であっ
てもよい。さらに、電気融着継手１自身の形状として
も、径違い継手、給水栓ソケット、エルボ、チーズなど
各種形状のものであってもよい。Further, the present invention is not limited to the electric fusion joint 1 in which the resin pipes 6 are fitted from both ends to perform electric fusion, and only one end is subjected to the electric fusion. The fitting may be a fitting in which a male screw or a female screw made of metal is insert-molded on the other end side, and an electric fusion-bonding joint (not shown) provided with other various connecting means. Further, the shape of the electric fusion splicing joint 1 itself may be various shapes such as a reducing joint, a water tap socket, an elbow, and cheese.

【００２５】さらに、本実施例では、熱可塑性樹脂から
なる円筒体３が内層で、架橋熱可塑性樹脂からなる被覆
層５が外層となるように電気融着継手１が構成されてい
るが、外層が熱可塑性樹脂で内層が架橋熱可塑性樹脂と
なるように構成してもよい。Further, in this embodiment, the electric fusion-bonded joint 1 is constructed such that the cylindrical body 3 made of a thermoplastic resin is an inner layer and the coating layer 5 made of a crosslinked thermoplastic resin is an outer layer. May be a thermoplastic resin, and the inner layer may be a cross-linked thermoplastic resin.

【００２６】[0026]

【実施例２】図４は、本実施例に係る電気融着継手の全
体構成の概略を示している。[Embodiment 2] FIG. 4 schematically shows the overall structure of an electric fusion joint according to this embodiment.

【００２７】すなわち、この電気融着継手１は、上記実
施例１の電気融着継手１と、接着層７が異なるだけであ
るので、ここではその相違点についてのみ説明し、その
他の説明は省略する。なお、上記実施例１と同一部材に
は同符号を付す。That is, since the electric fusion-bonding joint 1 is different from the electric fusion-bonding joint 1 of the first embodiment only in the adhesive layer 7, only the difference will be described here, and the other description will be omitted. To do. The same members as those in the first embodiment are designated by the same reference numerals.

【００２８】この電気融着継手１の接着層７は、円筒体
３の熱可塑性樹脂と同材質の熱可塑性樹脂によって構成
されている。そして、被覆層５である架橋熱可塑性樹脂
と強固に一体化した状態となされている。The adhesive layer 7 of the electric fusion joint 1 is made of a thermoplastic resin of the same material as the thermoplastic resin of the cylindrical body 3. Then, it is in a state of being firmly integrated with the crosslinked thermoplastic resin which is the coating layer 5.

【００２９】このように、接着層７を被覆層５と一体化
した状態にするために、この電気融着継手１は、次のよ
うにして製造される。In order to make the adhesive layer 7 and the coating layer 5 integral with each other in this way, the electric fusion-bonded joint 1 is manufactured as follows.

【００３０】すなわち、図５に示すように、まず、円筒
体３を接着層金型９１内にセットする（図５(a) 参照)
。そして、この円筒体３の表面を被覆するように、該
円筒体３を構成する熱可塑性樹脂と同材質の接着樹脂７
１を射出成形する（図５(b) 参照) 。ついで、この接着
樹脂７１が高温状態のうちに接着層金型９１を開き、別
の成形金型９２内に再びセットする（図５(c) 参照) 。
そして、この接着樹脂７１が高温状態のうちに、該接着
樹脂７１を覆うように架橋熱可塑性樹脂５１を射出する
（図５(d) 参照) 。その後、この接着樹脂７１および架
橋熱可塑性樹脂５１を同時に冷却硬化させて脱型するこ
とで、接着層７と被覆層５とが一体化した状態となされ
た電気融着継手１が得られる（図５(e) 参照) 。That is, as shown in FIG. 5, first, the cylindrical body 3 is set in the adhesive layer mold 91 (see FIG. 5 (a)).
. Then, an adhesive resin 7 made of the same material as the thermoplastic resin forming the cylindrical body 3 so as to cover the surface of the cylindrical body 3.
1 is injection molded (see FIG. 5 (b)). Then, while the adhesive resin 71 is in a high temperature state, the adhesive layer mold 91 is opened and set again in another molding mold 92 (see FIG. 5 (c)).
Then, while the adhesive resin 71 is in a high temperature state, the crosslinked thermoplastic resin 51 is injected so as to cover the adhesive resin 71 (see FIG. 5 (d)). After that, the adhesive resin 71 and the crosslinked thermoplastic resin 51 are simultaneously cooled and hardened and released from the mold to obtain the electric fusion-bonded joint 1 in which the adhesive layer 7 and the coating layer 5 are integrated (FIG. 5 (e)).

【００３１】すなわち、この製造方法によると、接着樹
脂７１と架橋熱可塑性樹脂５１とが互いに接触した高温
状態から硬化して接着層７および被覆層５を形成するこ
ととなり、この両層を強固に一体化することが可能とな
る。また、円筒体３と接着層７との間は、円筒体３があ
らかじめ成形された硬化状態のものであるため、確実に
一体化した状態とすることが困難となるが、図６に示す
ように、この円筒体３と接着層７とは、同じ熱可塑性樹
脂で構成されているので、電気融着時にコイル２の発熱
によって円筒体３の部分が溶融する際に、接着層７の部
分も同様に溶融し、円筒体３と接着層７とが溶融一体化
して熱可塑性樹脂層８を形成することとなる。That is, according to this manufacturing method, the adhesive resin 71 and the crosslinked thermoplastic resin 51 are cured from a high temperature state in which they are in contact with each other to form the adhesive layer 7 and the coating layer 5, and both layers are firmly bonded. It becomes possible to integrate. In addition, since the cylindrical body 3 and the adhesive layer 7 are in a cured state in which the cylindrical body 3 has been preliminarily molded, it is difficult to surely bring the cylindrical body 3 into an integrated state, but as shown in FIG. In addition, since the cylindrical body 3 and the adhesive layer 7 are made of the same thermoplastic resin, when the portion of the cylindrical body 3 is melted by the heat generation of the coil 2 during electric fusion, the portion of the adhesive layer 7 is also Similarly, the cylindrical body 3 and the adhesive layer 7 are melted and fused together to form the thermoplastic resin layer 8.

【００３２】[0032]

【発明の効果】以上述べたように、請求項１記載の本発
明によると、熱可塑性樹脂円筒体と架橋熱可塑性樹脂層
とを、変性ポリマーからなる接着層を介して一体化する
ことができるので、この熱可塑性樹脂円筒体と架橋熱可
塑性樹脂層との間に水みちを生じることなく、優れた耐
熱性および止水性を得ることができる。As described above, according to the present invention of claim 1, the thermoplastic resin cylinder and the crosslinked thermoplastic resin layer can be integrated through the adhesive layer made of the modified polymer. Therefore, excellent heat resistance and water shutoff can be obtained without producing a water gap between the thermoplastic resin cylinder and the crosslinked thermoplastic resin layer.

【００３３】また、請求項２記載の本発明によると、架
橋熱可塑性樹脂層と一体化した接着層を、電気融着時に
熱可塑性樹脂円筒体と溶融一体化することができるの
で、熱可塑性樹脂円筒体と架橋熱可塑性樹脂層との間に
水みちを生じることなく、優れた耐熱性および止水性を
得ることができる。According to the second aspect of the present invention, since the adhesive layer integrated with the crosslinked thermoplastic resin layer can be melt-integrated with the thermoplastic resin cylinder during electric fusion, the thermoplastic resin It is possible to obtain excellent heat resistance and waterproofness without generating a water gap between the cylindrical body and the crosslinked thermoplastic resin layer.

【００３４】さらに、請求項３記載の本発明によると、
熱可塑性樹脂と架橋熱可塑性樹脂とが一体化した電気融
着継手を提供することができる。Further, according to the invention of claim 3,
It is possible to provide an electric fusion joint in which a thermoplastic resin and a crosslinked thermoplastic resin are integrated.

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

【図１】実施例１に係る電気融着継手の全体構成の概略
を示す断面図である。FIG. 1 is a cross-sectional view showing the outline of the overall configuration of an electric fusion joint according to a first embodiment.

【図２】円筒体の各種実施例を示す断面図である。FIG. 2 is a cross-sectional view showing various examples of a cylindrical body.

【図３】電気融着継手の他の実施例を示す断面図であ
る。FIG. 3 is a sectional view showing another embodiment of the electric fusion joint.

【図４】実施例２に係る電気融着継手の全体構成の概略
を示す断面図である。FIG. 4 is a cross-sectional view showing the outline of the overall configuration of an electric fusion joint according to Example 2.

【図５】実施例２に係る電気融着継手の製造工程の概略
を示す各工程図である。5A to 5C are process diagrams illustrating the outline of the manufacturing process of the electric fusion joint according to the second embodiment.

【図６】図４に示す電気融着継手の融着後の状態を示す
断面図である。6 is a cross-sectional view showing a state after fusion bonding of the electric fusion joint shown in FIG.

【符号の説明】[Explanation of symbols]

１ 電気融着継手 ２ コイル（発熱体） ３ 円筒体（熱可塑性樹脂円筒体） ４ 接着層 ５ 被覆層（架橋熱可塑性樹脂層） ７ 接着層 DESCRIPTION OF SYMBOLS 1 Electrofusion joint 2 Coil (heating element) 3 Cylindrical body (thermoplastic resin cylindrical body) 4 Adhesive layer 5 Covering layer (crosslinked thermoplastic resin layer) 7 Adhesive layer

Claims (3)

【特許請求の範囲】[Claims] 【請求項１】 発熱体を有する熱可塑性樹脂円筒体の外
周に、架橋熱可塑性樹脂層が設けられた電気融着継手で
あって、前記熱可塑性樹脂円筒体と架橋熱可塑性樹脂層
との間に、該熱可塑性樹脂の変性ポリマーによる接着層
が設けられたことを特徴とする電気融着継手。1. An electric fusion joint in which a cross-linked thermoplastic resin layer is provided on the outer periphery of a thermoplastic resin cylinder having a heating element, the space between the thermoplastic resin cylinder and the cross-linked thermoplastic resin layer. An electric fusion-bonded joint, characterized in that an adhesive layer made of a modified polymer of the thermoplastic resin is provided on the. 【請求項２】 発熱体を有する熱可塑性樹脂円筒体の外
周に、架橋熱可塑性樹脂層が設けられた電気融着継手で
あって、前記熱可塑性樹脂円筒体と架橋熱可塑性樹脂層
との間に、前記熱可塑性樹脂円筒体と同材質の熱可塑性
樹脂による接着層が設けられ、この接着層は、成形直後
の高温状態から前記架橋熱可塑性樹脂層とともに冷却さ
れて両層間が接着されていることを特徴とする電気融着
継手。2. An electrofusion joint in which a crosslinked thermoplastic resin layer is provided on the outer periphery of a thermoplastic resin cylindrical body having a heating element, wherein the thermoplastic resin cylindrical body and the crosslinked thermoplastic resin layer are provided between the thermoplastic resin cylindrical body and the crosslinked thermoplastic resin layer. Is provided with an adhesive layer made of a thermoplastic resin of the same material as the thermoplastic resin cylinder, and the adhesive layer is cooled together with the crosslinked thermoplastic resin layer from a high temperature state immediately after molding, and the two layers are adhered to each other. An electric fusion splicing joint characterized by the above. 【請求項３】 発熱体を有する熱可塑性樹脂円筒体の外
表面に、該円筒体と同材質の熱可塑性樹脂を射出して接
着層を成形し、この接着層が成形直後の高温状態にある
うちに、該接着層の外表面に、架橋性を有する熱可塑性
樹脂を射出して冷却硬化させることを特徴とする電気融
着継手の製造方法。3. An adhesive layer is formed on the outer surface of a thermoplastic resin cylinder having a heating element by injecting a thermoplastic resin of the same material as the cylinder, and the adhesive layer is in a high temperature state immediately after the molding. A method for producing an electric fusion-bonded joint, characterized in that a thermoplastic resin having a crosslinkability is injected onto the outer surface of the adhesive layer to be cooled and cured.
JP3344464A 1991-12-26 1991-12-26 Electric fusion attach pipe fitting and manufacture thereof Pending JPH05172289A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3344464A JPH05172289A (en) 1991-12-26 1991-12-26 Electric fusion attach pipe fitting and manufacture thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3344464A JPH05172289A (en) 1991-12-26 1991-12-26 Electric fusion attach pipe fitting and manufacture thereof

Publications (1)

Publication Number Publication Date
JPH05172289A true JPH05172289A (en) 1993-07-09

Family

ID=18369469

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3344464A Pending JPH05172289A (en) 1991-12-26 1991-12-26 Electric fusion attach pipe fitting and manufacture thereof

Country Status (1)

Country Link
JP (1) JPH05172289A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005090595A (en) * 2003-09-16 2005-04-07 Mitsubishi Plastics Ind Ltd Electric fusion joint, and method for manufacturing the same
JP2005256934A (en) * 2004-03-11 2005-09-22 Mitsubishi Plastics Ind Ltd Electric fusion joint and its manufacturing method
JP2008111459A (en) * 2006-10-30 2008-05-15 Maezawa Kyuso Industries Co Ltd Electromagnetic fusion joint

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005090595A (en) * 2003-09-16 2005-04-07 Mitsubishi Plastics Ind Ltd Electric fusion joint, and method for manufacturing the same
JP2005256934A (en) * 2004-03-11 2005-09-22 Mitsubishi Plastics Ind Ltd Electric fusion joint and its manufacturing method
JP2008111459A (en) * 2006-10-30 2008-05-15 Maezawa Kyuso Industries Co Ltd Electromagnetic fusion joint

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