JPH094783A - Manufacture of electric fusion coupling - Google Patents

Manufacture of electric fusion coupling

Info

Publication number
JPH094783A
JPH094783A JP7153060A JP15306095A JPH094783A JP H094783 A JPH094783 A JP H094783A JP 7153060 A JP7153060 A JP 7153060A JP 15306095 A JP15306095 A JP 15306095A JP H094783 A JPH094783 A JP H094783A
Authority
JP
Japan
Prior art keywords
resin
mold
heating wire
electric fusion
coated heating
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
JP7153060A
Other languages
Japanese (ja)
Inventor
Koji Shimonishi
弘二 下西
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 JP7153060A priority Critical patent/JPH094783A/en
Publication of JPH094783A publication Critical patent/JPH094783A/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
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D23/00—Producing tubular articles
    • B29D23/001—Pipes; Pipe joints
    • B29D23/003—Pipe joints, e.g. straight joints
    • B29D23/005—Pipe joints, e.g. straight joints provided with electrical wiring
    • 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
    • B29C65/3464—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 characterised by the cross-section of said heated elements which remain in the joint or by the cross-section of their coating, e.g. being triangular
    • 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
    • B29C66/114—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
    • B29C66/50—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
    • B29C66/52298—Joining tubular articles involving the use of a socket said socket being composed by several elements
    • 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)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

PURPOSE: To provide a manufacturing method for an electric fusion coupling having resin-covered heating wires embedded at equal intervals in a wall. CONSTITUTION: Manufacture of an electric fusion coupling is such that, at a stage wherein resin is injected in a mold 1 in a mold clamping state comprising an outer mold 11 and a core mold 12, resin-covered electric heating wires are embedded in a wall. A process wherein after a resin-covered electric heating wire 2 having fit-in parts 23 and 24 at both sides along a longitudinal direction is wound around the core mold 12 in a mold opening state in such a state that the fit-in parts 23 and 24 are fitted in each other, the mold is forced into a mold clamping state.

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、樹脂製のガス管や上下
水道等の管を電気融着接合する電気融着継手の製造方法
に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing an electric fusion joint for electrically fusion-bonding a resin gas pipe or a pipe for water and sewerage.

【０００２】[0002]

【従来の技術】通電により発熱する発熱線を巻回したコ
ア型の周りに樹脂を射出成形する方法により製造された
電気融着継手は、射出成形時の樹脂流動のために発熱線
が押し流されて曲り、短絡や断線を起こすことがあると
いう問題点がある。2. Description of the Related Art An electric fusion joint manufactured by a method of injection-molding a resin around a core mold around which a heating wire that generates heat when energized is injected, and the heating wire is swept away by the resin flow during injection molding. There is a problem that it may bend and cause a short circuit or disconnection.

【０００３】この問題点に鑑み、例えば、図４（ａ）に
示すような断面円形の中央部に電熱線が埋設された樹脂
被覆電熱線ａを用いるか、図４（ｂ）に示すような断面
半円形の中央に電熱線が埋設された樹脂被覆電熱線ｂを
用いて、これらを、図５に示すように、コア型ｃに巻き
付けた後、コテ等により隣接する樹脂被覆電熱線の相互
間を部分的に融着させて結束用融着部ｄを設ける方法が
知られている。In view of this problem, for example, as shown in FIG. 4 (a), a resin-coated heating wire a in which a heating wire is embedded in the central portion having a circular cross section is used, or as shown in FIG. 4 (b). As shown in FIG. 5, by using a resin-coated heating wire b having a heating wire embedded in the center of a semicircular cross section, these are wound around a core mold c, and then the adjacent resin-coated heating wires are separated by a trowel or the like. A method is known in which the space is partially fused and the binding fusion portion d is provided.

【０００４】又、特開平３─８９０９４号公報には、図
６に示すように、両側縁に相互に重ね合わせることがで
きる水平段部ｅ1 ，ｅ2 が形成され、中央部に電熱線が
埋設された樹脂被覆電熱線ｅを用いて、これを、コア型
に両側縁の水平段部ｅ1 ，ｅ 2 同士を重ね合わせるよう
にして巻き付ける方法が提案されている。Further, in Japanese Patent Laid-Open No. 3-89094,
As shown in 6, it can be overlapped on both edges.
Horizontal step e1, E2Is formed and a heating wire is
Using the embedded resin-coated heating wire e,
Horizontal step e on both edges1, E 2Let's stack each other
Then, a method of wrapping is proposed.

【０００５】[0005]

【発明が解決しようとする課題】しかしながら、前者の
場合には、コア型ｃに樹脂被覆電熱線を巻き付けた後、
隣接する樹脂被覆電熱線の相互間を部分的に融着させて
結束融着部ｄを設ける必要があるため、作業性が悪く、
サイクルタイム短縮の障害となり、又、結束融着部ｄ以
外のところでは、隣接する樹脂被覆電熱線間に隙間がで
きる部分が生じて、射出成形時の樹脂流動のために樹脂
被覆電熱線間に樹脂が不規則に入り込み、壁内に樹脂被
覆電熱線を等間隔で埋設した電気融着継手を得ることが
できないという問題点があった。However, in the former case, after winding the resin-coated heating wire around the core mold c,
Since it is necessary to partially fuse the adjacent resin-coated heating wires to each other to provide the binding fusion portion d, workability is poor,
This is an obstacle to shortening the cycle time, and there is a gap between adjacent resin-coated heating wires other than the bundling and fusion-bonding part d, which causes resin flow during injection molding to cause resin flow between the resin-coated heating wires. There is a problem in that the resin enters irregularly and it is impossible to obtain an electric fusion-bonded joint in which the resin-coated heating wires are embedded in the wall at equal intervals.

【０００６】又、後者の場合には、コア型に両側縁の水
平段部ｅ1 ，ｅ2 同士を重ね合わせるようにして巻き付
ける際に、段部同士を正確に重ね合わせるようにしてコ
ア型の周りに巻き付ける作業が煩雑であるのみならず、
射出成形時の樹脂流動のために重合ね合わせ部分が相互
に滑って樹脂被覆発熱線ｅが押し流されて位置ずれを起
こす危険性があるという問題点がある。Further, in the latter case, when the horizontal steps e 1 and e 2 on both side edges are wound around the core mold so as to be overlapped with each other, the steps are accurately overlapped and the core mold Not only is the work of wrapping around it complicated,
There is a problem that there is a risk that the resin-bonded heating wires e will be swept away due to the flow of the resin during the injection molding, causing the overlapping portions to slide over each other, resulting in positional displacement.

【０００７】本発明は、上記の如き従来の問題点を解消
し、壁内に樹脂被覆電熱線が等間隔で埋設された電気融
着継手の製造方法を提供することを目的としてなされた
ものである。The present invention has been made for the purpose of solving the above-mentioned conventional problems and providing a method for manufacturing an electric fusion joint in which a resin-coated heating wire is embedded in a wall at equal intervals. is there.

【０００８】[0008]

【課題を解決するための手段】本発明は、外型とコア型
からなる型締め状態の金型内に樹脂を射出成形する段階
で、壁内に樹脂被覆電熱線を埋設する電気融着継手の製
造方法であって、型開き状態のコア型の周りに、両側部
に長手方向に沿って相互に嵌合部を有する樹脂被覆電熱
線を、その側部の嵌合部を嵌合させるようにして巻き付
けた後、型締め状態となす電気融着継手の製造方法であ
る。DISCLOSURE OF THE INVENTION The present invention provides an electric fusion joint in which a resin-coated heating wire is embedded in a wall at the stage of injection-molding a resin in a mold-clamped mold composed of an outer mold and a core mold. A method for manufacturing a resin-coated heating wire having a mating part on both sides along the longitudinal direction around the core mold in the mold open state so that the mating part on the side part is fitted. It is a method of manufacturing an electric fusion-bonded joint in which the mold is clamped after being wound.

【０００９】本発明において、樹脂被覆電熱線を構成す
る電熱線としては、例えば、ステンレス線、銅ニッケル
線、鉄クロム線等が使用される。樹脂被覆電熱線の樹脂
被覆層を構成する樹脂としては、例えば、ポリフェニレ
ンサルファイド、硬質ポリ塩化ビニル、ポリエーテルエ
ーテルケトンや、中密度ポリエチレン、高密度ポリエチ
レン、ポリプロピレン、ポリブテン等のポリオレフィン
などの熱可塑性樹脂が使用される。又、樹脂中には、必
要に応じて、タルク、金属繊維、炭素繊維、ガラス繊維
等の充填材が混合されてもよい。In the present invention, as the heating wire constituting the resin-coated heating wire, for example, a stainless wire, a copper nickel wire, an iron chrome wire or the like is used. Examples of the resin that constitutes the resin coating layer of the resin-coated heating wire include thermoplastic resins such as polyphenylene sulfide, hard polyvinyl chloride, polyether ether ketone, and polyolefins such as medium density polyethylene, high density polyethylene, polypropylene, and polybutene. Is used. Further, a filler such as talc, metal fiber, carbon fiber, glass fiber and the like may be mixed in the resin as required.

【００１０】本発明において、射出成形用の樹脂として
は、例えば、硬質ポリ塩化ビニルや、ポリエチレン、ポ
リプロピレン等のポリオレフィン等が使用される。In the present invention, as the resin for injection molding, for example, hard polyvinyl chloride or polyolefin such as polyethylene or polypropylene is used.

【００１１】本発明において、コア型の周りに樹脂被覆
電熱線を巻き付けた状態にする方法としては、コア型の
周りに、樹脂被覆電熱線を巻き付けてもよいし、又、予
め樹脂被覆電熱線をコイル状に巻回したものを、コア型
の周りに装着するようにしてもよい。In the present invention, as a method of winding the resin-coated heating wire around the core die, the resin-coated heating wire may be wrapped around the core die, or the resin-coated heating wire may be wound in advance. The coil may be wound in a coil shape and mounted around the core mold.

【００１２】以下、本発明を図面を参照して説明する。
図１は、本発明の電気融着継手の製造方法に用いる金型
の一例の一部を示す説明図である。The present invention will be described below with reference to the drawings.
FIG. 1 is an explanatory view showing a part of an example of a mold used in the method for manufacturing an electrofusion joint of the present invention.

【００１３】１は金型であって、外型１１とコア型１２
からなる。外型１１は、２つ割りとされ開閉自在とされ
た型片１１１，１１２から構成されており、一方の型片
１１１の略中央部に樹脂ゲート１１１ａが設けられ、両
端部の内周面に樹脂被覆発熱線の端部導出用の凹部１１
１ｂ，１１１ｂが設けられている。Reference numeral 1 denotes a mold, which includes an outer mold 11 and a core mold 12.
Consists of The outer mold 11 is composed of mold pieces 111 and 112 which are divided into two pieces and which can be opened and closed. A resin gate 111a is provided substantially in the center of one of the mold pieces 111, and the inner peripheral surfaces of both ends are formed. Recess 11 for leading out the end of the resin-coated heating wire
1b and 111b are provided.

【００１４】コア型１２は、一対の円筒状型片１２１，
１２２から構成されている。各円筒状型片１２１，１２
２の基端部には周方向に沿ってやや幅広の鍔部１２３，
１２４が設けられている。The core mold 12 comprises a pair of cylindrical mold pieces 121,
It is composed of 122. Each cylindrical mold piece 121, 12
At the base end of 2, a flange portion 123, which is slightly wider along the circumferential direction,
124 is provided.

【００１５】そして、射出成形時には、コア１２は、一
対の円筒状型片１２１，１２２の先端面同士が突き合わ
され、外型１１との間で閉型状態とされて、一対の円筒
状型片１２１，１２２の外周面と、鍔部１２３，１２４
の内側面と、外型１１の内周面との間に管継手を成形す
べきキャビティ１３が形成される。At the time of injection molding, the core 12 has a pair of cylindrical mold pieces 121, 122 whose end faces are abutted against each other and is closed with the outer mold 11 to form a pair of cylindrical mold pieces. Outer peripheral surfaces of 121 and 122 and collar portions 123 and 124
A cavity 13 for forming a pipe joint is formed between the inner side surface of the outer mold 11 and the inner peripheral surface of the outer mold 11.

【００１６】又、型開き時には、円筒状型片１２１，１
２２の先端部間が開いて、成形品の脱型ができるように
なっている。Further, when the mold is opened, the cylindrical mold pieces 121, 1
The gap between the tips of the 22 is open so that the molded product can be released from the mold.

【００１７】次に図１に示す金型１を用いた本発明の電
気融着継手の製造方法の一例の工程を図２を参照して説
明する。図２（ａ）は、本発明に使用する樹脂被覆電熱
線の一例を示す斜視図である。２は樹脂被覆電熱線であ
って、樹脂本体部２１の中央部に電熱線２２が埋設され
ている。樹脂本体部２１の一側縁に長手方向に沿って下
部から上方に向けて断面鍵爪状に折曲する第１の嵌合部
２３が設けられ、他側縁に長手方向に沿って上部から下
方に向けて断面鍵爪状に折曲し、第１の嵌合部２３に嵌
合する第２の嵌合部２４が設けられている。Next, the steps of an example of a method for manufacturing an electric fusion joint of the present invention using the mold 1 shown in FIG. 1 will be described with reference to FIG. FIG. 2A is a perspective view showing an example of the resin-coated heating wire used in the present invention. Reference numeral 2 denotes a resin-coated heating wire, in which a heating wire 22 is embedded in the central portion of the resin body 21. A first fitting portion 23 is provided on one side edge of the resin main body 21 along the longitudinal direction to bend upward from the lower portion into a key-claw cross section, and on the other side edge from the upper portion along the longitudinal direction. A second fitting portion 24 that is bent downward in a key claw shape and that fits into the first fitting portion 23 is provided.

【００１８】この樹脂被覆電熱線２を、図２（ｂ）に示
すように、型開き状態のコア型１２の周りに、第１の嵌
合部２３と第２の嵌合部２４同士を嵌合するようにして
巻き付けていく。As shown in FIG. 2B, a first fitting portion 23 and a second fitting portion 24 of the resin-coated heating wire 2 are fitted around the core mold 12 in the mold open state. Wrap them so that they fit together.

【００１９】次に、図２（ｃ）に示すように、金型１を
型締め状態となし、図示しない射出成形機からの溶融樹
脂を樹脂ゲートから金型内に射出成形し、所定時間保圧
状態に保つ。この際、金型内に射出された溶融樹脂は、
螺旋状に巻き付けられた樹脂被覆発熱線２の周りに充填
されるが、樹脂被覆電熱線２は側縁同士が嵌合状態とさ
れているので、その間に溶融樹脂が入り込んだり、溶融
樹脂により押し流されるようなことがない。Next, as shown in FIG. 2 (c), the mold 1 is brought into a clamped state, molten resin from an injection molding machine (not shown) is injection-molded from the resin gate into the mold and kept for a predetermined time. Keep pressure. At this time, the molten resin injected into the mold is
It is filled around the spirally wound resin-coated heating wire 2, but since the resin-coated heating wire 2 is in a state where the side edges are fitted to each other, the molten resin may enter or be swept away by the molten resin. There is no such thing.

【００２０】その後、型開きし、脱型して、壁内に樹脂
被覆電熱線を等間隔で埋設した電気融着継手を得る。After that, the mold is opened and the mold is removed to obtain an electric fusion joint in which resin-coated heating wires are embedded in the wall at equal intervals.

【００２１】尚、樹脂被覆電熱線の両側縁に長手方向に
沿って設けられる嵌合部の先端部の形状としては、図３
（ａ）〜（ｄ）に順次示すように、断面形状が、円形
状、半円形状、三角形状、台形状であってもよい。The shape of the tip of the fitting portion provided on both side edges of the resin-coated heating wire along the longitudinal direction is as shown in FIG.
As shown in order from (a) to (d), the cross-sectional shape may be circular, semicircular, triangular, or trapezoidal.

【００２２】[0022]

【作用】本発明の電気融着継手の製造方法は、外型とコ
ア型からなる型締め状態の金型内に樹脂を射出成形する
段階で、壁内に樹脂被覆電熱線を埋設する電気融着継手
の製造方法であって、型開き状態のコア型の周りに、両
側部に長手方向に沿って嵌合部を有する樹脂被覆電熱線
を、その側部の嵌合部同士を嵌合させるようにして巻き
付けた後、型締め状態となす工程を有することにより、
型開き状態のコア型の周りに、第１の嵌合部と第２の嵌
合部同士を嵌合するようにして作業性よく巻き付けるこ
とができ、金型内に射出された溶融樹脂が嵌合部間に入
り込んだり、溶融樹脂により樹脂被覆電熱線が押し流さ
れるようなことがなく、壁内に樹脂被覆電熱線を等間隔
で埋設した電気融着継手を製造することができる。According to the method of manufacturing an electric fusion joint of the present invention, at the stage of injection-molding a resin in a mold in a mold clamped state consisting of an outer mold and a core mold, an electric fusion wire for burying a resin-coated heating wire in a wall is used. A method of manufacturing a welding joint, in which a resin-coated heating wire having fitting portions along both sides along the longitudinal direction is fitted around the core mold in the mold open state, and the fitting portions at the side portions are fitted together. After having been wound in this way, by having the process of putting in the mold clamped state,
The first fitting portion and the second fitting portion can be wound around each other around the core mold in the mold open state with good workability, and the molten resin injected into the mold fits. It is possible to manufacture the electric fusion-bonded joint in which the resin-coated heating wire is embedded at equal intervals in the wall without entering between the joints or being swept away by the molten resin.

【００２３】[0023]

【実施例】以下、本発明を実施例により説明する。実施例 図２（ａ）に示すような樹脂被覆発熱線２を準備し、こ
れを図２（ｂ）を参照して説明したように、コア型１２
の周りに樹脂被覆発熱線２を第１の嵌合部２３と第２の
嵌合部２４とを嵌合させるようにして巻き付けた。樹脂
被覆発熱線３としては直径０．６ｍｍのニクロム線がポ
リエチレン樹脂（三井石油化学社製、商品名「ハイゼッ
クス６３００Ｍ」）にて被覆された直径１．２ｍｍのも
のを用いた。The present invention will be described below with reference to examples. Example A resin-coated heating wire 2 as shown in FIG. 2 (a) was prepared, and as described with reference to FIG. 2 (b), the core mold 12 was prepared.
The resin-coated heating wire 2 was wound around the first fitting portion 23 and the second fitting portion 24 so as to fit each other. As the resin-coated heating wire 3, a Nichrome wire having a diameter of 0.6 mm and a diameter of 1.2 mm coated with a polyethylene resin (trade name “HIZEX 6300M” manufactured by Mitsui Petrochemical Co., Ltd.) was used.

【００２４】図２（ｃ）を参照して説明したように、射
出成形機（名機製作所、型式「Ｍ−３５０ＩＩ）を用い
て、ポリエチレン樹脂（三井石油化学社製、商品名「ハ
イゼックス６３００Ｍ」）を射出成形する工程を経て、
内径９０ｍｍ、肉厚１４ｍｍの、筒状壁内に発熱線が埋
設されたソケット型の電気融着継手を得た。尚、成形条
件としては、コア温度を７０℃、射出温度を２１０℃と
し、５０個の成形を行った。As described with reference to FIG. 2C, a polyethylene resin (manufactured by Mitsui Petrochemical Co., Ltd., trade name "Hi-Zex 6300M") is used by using an injection molding machine (Meiki Seisakusho, model "M-350II"). ) Is injection-molded,
A socket-type electric fusion joint having an inner diameter of 90 mm and a wall thickness of 14 mm, in which a heating wire was embedded in a tubular wall, was obtained. As molding conditions, the core temperature was 70 ° C., the injection temperature was 210 ° C., and 50 pieces were molded.

【００２５】得られた電気融着継手について、Ｘ線画像
装置（ソフロン社製、商品名「１３ＳＴ−１５０５」）
を用いてＸ線画像を観察して良否の判定を行った。その
結果を表１に示した。その結果、発熱線が０．５ｍｍ以
上ずれた不良率は０％であった。An X-ray imager (manufactured by Soflon, trade name "13ST-1505") was used for the obtained electric fusion joint.
The X-ray image was observed using the to determine the quality. The results are shown in Table 1. As a result, the defective rate in which the heating line was displaced by 0.5 mm or more was 0%.

【００２６】比較例 図６に示すように、樹脂被覆電熱線ｅを用いて、これを
コア型に両側縁の水平段部ｅ1 ，ｅ2 同士を重ね合わせ
るようにして巻き付けたこと以外は実施例と同様にし
て、実施例と同様の電気融着継手の製造を行った。得ら
れた電気融着継手について、実施例と同様にしてＸ線画
像を観察して良否の判定を行った。その結果、発熱線が
０．５ｍｍ以上ずれた不良率は９０％であった。 Comparative Example As shown in FIG. 6, a resin-coated heating wire e was used except that it was wound around a core mold so that horizontal step portions e 1 and e 2 on both side edges were overlapped with each other. In the same manner as in the example, an electric fusion joint similar to that in the example was manufactured. Regarding the obtained electric fusion-bonded joint, an X-ray image was observed in the same manner as in the example to determine the quality. As a result, the defective rate in which the heating line was displaced by 0.5 mm or more was 90%.

【００２７】[0027]

【発明の効果】本発明の電気融着継手の製造方法は、上
記の如き構成とされているので、壁内に樹脂被覆電熱線
を等間隔で埋設された電気融着継手を製造することがで
きる。EFFECTS OF THE INVENTION Since the method for producing an electric fusion joint of the present invention is configured as described above, it is possible to produce an electric fusion joint in which a resin-coated heating wire is embedded in a wall at equal intervals. it can.

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

【図１】本発明の樹脂被覆電熱線の製造方法に用いる金
型の一例を示す断面図である。FIG. 1 is a cross-sectional view showing an example of a mold used in a method for producing a resin-coated heating wire according to the present invention.

【図２】本発明の電気融着継手の製造方法の一例の工程
の説明図であり、（ａ）は樹脂被覆電熱線の一例を示す
斜視図、（ｂ）はコア型の周りに樹脂被覆電熱線を巻き
付ける状態を示す断面図、（ｃ）は射出成形工程を示す
一部切欠き正面図である。2A and 2B are explanatory views of steps of an example of a method for manufacturing an electric fusion joint of the present invention, FIG. 2A is a perspective view showing an example of a resin-coated heating wire, and FIG. 2B is a resin coating around a core mold. Sectional drawing which shows the state which winds a heating wire, (c) is a partially notched front view which shows an injection molding process.

【図３】樹脂被覆電熱線の両側縁に長手方向に沿って設
けられる嵌合部の先端部の断面形状を説明する断面図で
あり、（ａ）は円形状、（ｂ）は半円形状、（ｃ）は三
角形状、（ｄ）は台形状のものをそれぞれ示す断面図で
ある。FIG. 3 is a cross-sectional view illustrating a cross-sectional shape of a tip end portion of a fitting portion provided on both side edges of a resin-coated heating wire along a longitudinal direction, (a) is a circular shape, and (b) is a semi-circular shape. , (C) are cross-sectional views showing a triangular shape and (d) a trapezoidal shape, respectively.

【図４】従来の樹脂被覆電熱線の例を示す説明図であ
り、（ａ）は断面形状が円形状のもの、（ｂ）は断面形
状が半円形状のものをそれぞれ示す斜視図である。4A and 4B are explanatory views showing an example of a conventional resin-coated heating wire, FIG. 4A is a perspective view showing a circular sectional shape, and FIG. 4B is a perspective view showing a semicircular sectional shape. .

【図５】従来の電気融着継手の製造方法の一例の工程を
説明する正面図である。FIG. 5 is a front view illustrating a step of an example of a conventional method for manufacturing an electric fusion joint.

【図６】従来の電気融着継手の製造方法の別の例の工程
を説明する断面図である。FIG. 6 is a cross-sectional view illustrating a step of another example of the conventional method for manufacturing an electric fusion joint.

【符号の説明】[Explanation of symbols]

１ 金型 ２ 樹脂被覆発熱線 1 Mold 2 Resin coated heating wire

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】 外型とコア型からなる型締め状態の金型
内に樹脂を射出成形する段階で、壁内に樹脂被覆電熱線
を埋設する電気融着継手の製造方法であって、型開き状
態のコア型の周りに、両側部に長手方向に沿って嵌合部
を有する樹脂被覆電熱線を、その側部の嵌合部同士を嵌
合させるようにして巻き付けた後、型締め状態となす工
程を有することを特徴とする電気融着継手の製造方法。1. A method for manufacturing an electric fusion joint, in which a resin-coated heating wire is embedded in a wall at a step of injection-molding a resin in a mold-clamped mold including an outer mold and a core mold, the mold comprising: After winding a resin-coated heating wire that has fitting parts along both sides along the longitudinal direction around the open core mold so that the fitting parts on the side parts fit together, the mold is clamped. A method of manufacturing an electric fusion-bonded joint, comprising:
JP7153060A 1995-06-20 1995-06-20 Manufacture of electric fusion coupling Pending JPH094783A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7153060A JPH094783A (en) 1995-06-20 1995-06-20 Manufacture of electric fusion coupling

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7153060A JPH094783A (en) 1995-06-20 1995-06-20 Manufacture of electric fusion coupling

Publications (1)

Publication Number Publication Date
JPH094783A true JPH094783A (en) 1997-01-07

Family

ID=15554112

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7153060A Pending JPH094783A (en) 1995-06-20 1995-06-20 Manufacture of electric fusion coupling

Country Status (1)

Country Link
JP (1) JPH094783A (en)

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