JPH08187800A - 管路閉塞用キャップの製造方法 - Google Patents

管路閉塞用キャップの製造方法

Info

Publication number
JPH08187800A
JPH08187800A JP7000199A JP19995A JPH08187800A JP H08187800 A JPH08187800 A JP H08187800A JP 7000199 A JP7000199 A JP 7000199A JP 19995 A JP19995 A JP 19995A JP H08187800 A JPH08187800 A JP H08187800A
Authority
JP
Japan
Prior art keywords
heating wire
thermoplastic resin
core material
cylindrical
electric 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
JP7000199A
Other languages
English (en)
Inventor
Yuichi Shiohama
裕一 塩浜
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 JP7000199A priority Critical patent/JPH08187800A/ja
Publication of JPH08187800A publication Critical patent/JPH08187800A/ja
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
    • B29C66/53—Joining single elements to tubular articles, hollow articles or bars
    • B29C66/534—Joining single elements to open ends of tubular or hollow articles or to the ends of bars
    • 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"
    • B29C65/3468—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the means for supplying heat to said heated elements which remain in the join, e.g. special electrical connectors of windings
    • 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"
    • B29C65/36—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" heated by induction
    • B29C65/3604—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" heated by induction characterised by the type of elements heated by induction which remain in the joint
    • B29C65/362—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" heated by induction characterised by the type of elements heated by induction 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"
    • B29C65/36—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" heated by induction
    • B29C65/3668—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" heated by induction characterised by the means for supplying heat to said heated elements which remain in the join, e.g. special induction coils
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/61—Joining from or joining on the inside
    • B29C66/612—Making circumferential 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
    • B29C66/70—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
    • B29C66/72—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 structure of the material of the parts to be joined
    • B29C66/723—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 structure of the material of the parts to be joined being multi-layered
    • B29C66/7232—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 structure of the material of the parts to be joined being multi-layered comprising a non-plastics layer
    • B29C66/72321—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 structure of the material of the parts to be joined being multi-layered comprising a non-plastics layer consisting of metals or their alloys
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/10—Means for stopping flow from or in pipes or hoses
    • 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
    • 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
    • B29C65/3492—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 being carbon
    • 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"
    • B29C65/36—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" heated by induction
    • B29C65/3672—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" heated by induction characterised by the composition of the elements heated by induction which remain in the joint
    • B29C65/3676—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" heated by induction characterised by the composition of the elements heated by induction 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
    • 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"
    • B29C65/36—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" heated by induction
    • B29C65/3672—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" heated by induction characterised by the composition of the elements heated by induction which remain in the joint
    • B29C65/3684—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" heated by induction characterised by the composition of the elements heated by induction 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
    • B29C66/70—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)
  • General Engineering & Computer Science (AREA)
  • Pipe Accessories (AREA)

Abstract

(57)【要約】 【目的】 電熱線に凹凸や疎密が生じる恐れのない管路
閉塞用キャップの製造方法を提供する。 【構成】 熱可塑性樹脂により被覆された電熱線２をこ
の電熱線を被覆する熱可塑性樹脂と熱溶着できる円筒状
の熱可塑性樹脂製芯材１に螺旋状に巻き付ける工程、電
熱線２の両端に通電用のターミナルピン２１を接合する
工程、円筒状に巻き付けられた電熱線２及びターミナル
ピン２１を射出成形金型のキャビティ内に固定し、射出
成形により円筒状の芯材１に巻き付けられた電熱線２の
内側に熱可塑性樹脂を射出して円筒状の芯材１の内側に
管路閉塞用キャップ本体３を成形し、冷却固化する工
程、円筒状の芯材１の内側に管路閉塞用キャップ本体３
が設けられたものを射出成形金型から取り出した後、固
定治具４内に挿入して固定し、電熱線２に通電すること
により電熱線２に被覆された熱可塑性樹脂と熱可塑性樹
脂製芯材１とを溶着させる工程とからなる。

Description

【発明の詳細な説明】
【０００１】
【産業上の利用分野】本発明は、上下水管或いはガス管
としての使用を停止した管の管路を閉塞するために使用
して好適な管路閉塞用キャップの製造方法に関する。
【０００２】
【従来の技術】従来、例えば、特開平６−２０７６９８
号公報に記載されているように、上下水管或いはガス管
としての使用を停止した管の管路を閉塞するために使用
する管路閉塞用キャップが知られている。
【０００３】このような管路閉塞用キャップは、一端が
閉塞された熱可塑性樹脂製円筒体の外周面に発熱体であ
る電熱線が埋設され、通電用ターミナルピンが設けられ
たものである。このような管路閉塞用キャップの製造方
法としては、円筒状の熱可塑性樹脂製芯材に同種の熱可
塑性樹脂で被覆した電熱線を螺旋状に巻き付け、円筒状
の芯材の内面を加熱することにより芯材と電熱線の被覆
樹脂とを溶着させ、電熱線の両端にターミナルピンを取
付けた後、電熱線を巻き付けた芯材を射出成形金型のキ
ャビティ内に挿入し、射出成形により芯材の内方に熱可
塑性樹脂を射出成形していた。
【０００４】
【発明が解決しようとする課題】しかしながら、叙上の
製造方法においては、芯材の内面を加熱する際、加熱状
態が不均一となり易く、加熱状態が不均一となると冷却
時の収縮量に差が生じ、電熱線が巻き付けられた芯材の
外面に凹凸が生じ電熱線に凹凸や疎密が生じて良好な製
品が得られない。
【０００５】本発明は従来の上記の問題点に着目しなさ
れたものであって、その目的とするところは、上記の問
題点を解消し、電熱線に凹凸や疎密が生じる恐れのない
管路閉塞用キャップの製造方法を提供するにある。
【０００６】
【課題を解決するための手段】上記目的を達成するため
に、請求項１記載の本発明管路閉塞用キャップの製造方
法は、一端が閉塞された熱可塑性樹脂製円筒体の外周面
に発熱体である電熱線が埋設され、通電用ターミナルピ
ンが設けられた管路閉塞用キャップの製造方法におい
て、熱可塑性樹脂により被覆された電熱線をこの電熱線
を被覆する熱可塑性樹脂と熱溶着できる円筒状の熱可塑
性樹脂製芯材に螺旋状に巻き付ける工程、電熱線の両端
に通電用のターミナルピンを接合する工程、円筒状に巻
き付けられた電熱線及びターミナルピンを射出成形金型
のキャビティ内に固定し、射出成形により円筒状の芯材
に巻き付けられた電熱線の内側に熱可塑性樹脂を射出し
て円筒状の芯材の内側に管路閉塞用キャップ本体を成形
し、冷却固化する工程、円筒状の芯材の内側に管路閉塞
用キャップ本体が設けられたものを射出成形金型から取
り出した後、固定用治具内に挿入して固定し、電熱線に
通電することにより電熱線に被覆された熱可塑性樹脂と
熱可塑性樹脂製芯材とを溶着させる工程とからなること
を特徴とするものである。
【０００７】又、請求項２記載の本発明管路閉塞用キャ
ップの製造方法は、一端が閉塞された熱可塑性樹脂製円
筒体の外周面に発熱体である電熱線が埋設され、通電用
ターミナルピンが設けられた管路閉塞用キャップの製造
方法において、熱可塑性樹脂により被覆された電熱線を
この電熱線を被覆する熱可塑性樹脂と熱溶着できる円筒
状の熱可塑性樹脂製芯材に螺旋状に巻き付ける工程、電
熱線の両端に通電用のターミナルピンを接合する工程、
円筒状に巻き付けられた電熱線及びターミナルピンを射
出成形金型のキャビティ内に固定し、射出成形により円
筒状の芯材に巻き付けられた電熱線の内側に熱可塑性樹
脂を射出して円筒状の芯材の内側に管路閉塞用キャップ
本体を成形し、冷却固化する工程、円筒状の芯材の内側
に管路閉塞用キャップ本体が設けられたものを射出成形
金型から取り出した後、固定用治具内に挿入して固定
し、高周波誘電加熱により電熱線を加熱し電熱線に被覆
された熱可塑性樹脂と熱可塑性樹脂製芯材とを溶着させ
る工程とからなることを特徴とするものである。
【０００８】本発明において、円筒体、及び芯材の熱可
塑性樹脂や、電熱線の被覆熱可塑性樹脂としては、特に
限定されるものではないが、例えば、ポリエチレン、ポ
リプロピレン、塩化ビニル樹脂等の汎用熱可塑性樹脂や
ポリフッ化ビニリデン、ポリフェニレンサルファイド等
の熱可塑性エンジニアリングプラスチックが使用でき
る。尚、芯材の熱可塑性樹脂と電熱線の被覆熱可塑性樹
脂とは同一の熱可塑性樹脂が使用されることが望ましい
が、加熱により相互に溶着できるものであれば異なった
ものであってもよい。又、円筒体の熱可塑性樹脂と芯材
の熱可塑性樹脂とは同一の熱可塑性樹脂もしくは相互に
熱溶着される熱可塑性樹脂が使用されることが望まし
い。
【０００９】又、請求項１記載の発明においては、電熱
線の材質としては、特に限定されるものではないが、例
えば、ニクロム線、銅−ニッケル合金線や炭素繊維等の
通電により発熱するものが使用できる。
【００１０】又、請求項２記載の発明においては、電熱
線の材質としては、特に限定されるものではないが、例
えば、ニクロム線、銅−ニッケル合金線や炭素繊維等の
高周波電流により発熱するものが使用できる。
【００１１】
【作用】請求項１記載の本発明管路閉塞用キャップの製
造方法においては、熱可塑性樹脂製円筒体の熱可塑性樹
脂と熱溶着できる熱可塑性樹脂により被覆された電熱線
を円筒状の熱可塑性樹脂製芯材に螺旋状に巻き付ける工
程、電熱線の両端に通電用のターミナルピンを接合する
工程、円筒状に巻き付けられた電熱線及びターミナルピ
ンを射出成形金型のキャビティ内に固定し、射出成形に
より円筒状の芯材に巻き付けられた電熱線の内側に熱可
塑性樹脂を充填して円筒状の芯材の内側に管路閉塞用キ
ャップ本体を成形し、冷却固化する工程、円筒状の芯材
の内側に管路閉塞用キャップ本体が設けられたものを射
出成形金型から取り出した後、固定治具内に挿入して固
定し、電熱線に通電することにより電熱線に被覆された
熱可塑性樹脂と熱可塑性樹脂製芯材とを溶着させる工程
とからなるものであって、電熱線に通電することにより
電熱線に被覆された熱可塑性樹脂と熱可塑性樹脂製芯材
とを溶着させる工程においては、円筒状の芯材の内側に
管路閉塞用キャップ本体が設けられたものを固定用治具
内に挿入して固定するものであるから、電熱線に凹凸が
生じたり疎密が生じたりする恐れはない。
【００１２】又、請求項２記載の本発明管路閉塞用キャ
ップの製造方法においては、熱可塑性樹脂製円筒体の熱
可塑性樹脂と熱溶着できる熱可塑性樹脂により被覆され
た電熱線を円筒状の熱可塑性樹脂製芯材に螺旋状に巻き
付ける工程、電熱線の両端に通電用のターミナルピンを
接合する工程、円筒状に巻き付けられた電熱線及びター
ミナルピンを射出成形金型のキャビティ内に固定し、射
出成形により円筒状の芯材に巻き付けられた電熱線の内
側に熱可塑性樹脂を充填して円筒状の芯材の内側に管路
閉塞用キャップ本体を成形し、冷却固化する工程、円筒
状の芯材の内側に管路閉塞用キャップ本体が設けられた
ものを射出成形金型から取り出した後、固定治具内に挿
入して固定し、高周波誘電加熱により電熱線を加熱し電
熱線に被覆された熱可塑性樹脂と熱可塑性樹脂製芯材と
を溶着させる工程とからなるものであって、高周波誘電
加熱により電熱線を加熱することにより電熱線に被覆さ
れた熱可塑性樹脂と熱可塑性樹脂製芯材とを溶着させる
工程においては、円筒状の芯材の内側に管路閉塞用キャ
ップ本体が設けられたものを固定用治具内に挿入して固
定するものであるから、電熱線に凹凸が生じたり疎密が
生じたりする恐れはない。
【００１３】
【実施例】次に、本発明の実施例を図面を参照しながら
説明する。 〔実施例１：請求項１記載の発明の実施例〕本発明にお
いては、先ず、図１に示すように、ポリエチレン製円筒
状芯材１にポリエチレン被覆電熱線２を螺旋状に巻き付
ける。この巻き付けの際に芯材１の内部に他の芯材（図
示しない）を嵌合して芯材１を補強してもよい。
【００１４】次に、図２に示すように、電熱線２の両端
部にターミナルピン２１を接合し、これを図示しない射
出成形金型のキャビティ内に挿入し、芯材１の内部にポ
リエチレン製本体３を成形し、冷却固化して射出成形金
型のキャビティ内から取り出す。２２はターミナルピン
２１に接合された電線である。
【００１５】このように芯材１の内部にポリエチレン製
本体３が成形されたものを、容器状固定用治具４の空洞
部４１内に挿入する。固定用治具４の空洞部４１は開口
部の口径は大きく奥部に入るに従い口径は縮小されるよ
うになっているので、固定用治具４の空洞部４１内に挿
入された芯材１の内部にポリエチレン製本体３が成形さ
れたものは空洞４１の壁面に密接し、固定される。。次
いで、電線２２を電源に接続して電熱線２に通電するこ
とにより電熱線２を発熱させ、その熱により電熱線２を
被覆するポリエチレン及び芯材１とを溶着一体化する。
【００１６】〔実施例の作用〕芯材１の内部にポリエチ
レン製本体３が成形されたものは図３に示すように、固
定用治具４の空洞部４１内に挿入固定して電熱線２に通
電することにより電熱線２を発熱させ、その熱により電
熱線２を被覆するポリエチレン及び芯材１とを溶着一体
化するものであるから、電熱線２には凹凸や疎密が生じ
る恐れはない。
【００１７】〔実施例２：請求項２記載の発明の実施
例〕図４は本発明の他の実施態様を示す断面図である。
図４に示す本発明においては、誘導コイル５に高周波電
流を流すことにより電熱線２を誘電加熱し、その熱によ
り電熱線２を被覆するポリエチレン及び芯材１とを溶着
一体化するものである。
【００１８】以上、本発明の実施例を図により説明した
が、本発明の構成は図示の実施例に限定されるものでは
なく、本発明の要旨を逸脱しない設計変更は本発明に含
まれる。例えば、固定用治具は図示の実施例のように容
器状のものを使用する代わりに管状のものを使用しても
よい。
【００１９】
【発明の効果】請求項１、２記載の本発明管路閉塞用キ
ャップの製造方法においては、円筒状の芯材の内側に管
路閉塞用キャップ本体が設けられたものを固定治具内に
挿入して固定するものであるから、電熱線に凹凸が生じ
たり疎密が生じたりする恐れはなく、品質の優れた管路
閉塞用キャップを製造することができる。
【図面の簡単な説明】
【図１】本発明管路閉塞用キャップの製造方法の一実施
態様において、芯材に電熱線を巻回した状態を示す左半
部切欠正面図。
【図２】本発明管路閉塞用キャップの製造方法の一実施
態様において、図１に示す工程の次工程を示す断面図。
【図３】本発明管路閉塞用キャップの製造方法の一実施
態様において、図２に示す工程の次工程を示す断面図。
【図４】本発明管路閉塞用キャップの製造方法の他の一
実施態様を示す左半部切欠正面図。
【符号の説明】
１ 芯材 ２ 電熱線 ２１ ターミナルピン ３ 管路閉塞用キャップ本体 ４ 固定用治具

Claims (2)

    【特許請求の範囲】
  1. 【請求項１】 一端が閉塞された熱可塑性樹脂製円筒体
    の外周面に発熱体である電熱線が埋設され、通電用ター
    ミナルピンが設けられた管路閉塞用キャップの製造方法
    において、熱可塑性樹脂により被覆された電熱線をこの
    電熱線を被覆する熱可塑性樹脂と熱溶着できる円筒状の
    熱可塑性樹脂製芯材に螺旋状に巻き付ける工程、電熱線
    の両端に通電用のターミナルピンを接合する工程、円筒
    状に巻き付けられた電熱線及びターミナルピンを射出成
    形金型のキャビティ内に固定し、射出成形により円筒状
    の芯材に巻き付けられた電熱線の内側に熱可塑性樹脂を
    射出して円筒状の芯材の内側に管路閉塞用キャップ本体
    を成形し、冷却固化する工程、円筒状の芯材の内側に管
    路閉塞用キャップ本体が設けられたものを射出成形金型
    から取り出した後、固定用治具内に挿入して固定し、電
    熱線に通電することにより電熱線に被覆された熱可塑性
    樹脂と熱可塑性樹脂製芯材とを溶着させる工程とからな
    ることを特徴とする管路閉塞用キャップの製造方法。
  2. 【請求項２】 一端が閉塞された熱可塑性樹脂製円筒体
    の外周面に発熱体である電熱線が埋設され、通電用ター
    ミナルピンが設けられた管路閉塞用キャップの製造方法
    において、熱可塑性樹脂により被覆された電熱線をこの
    電熱線を被覆する熱可塑性樹脂と熱溶着できる円筒状の
    熱可塑性樹脂製芯材に螺旋状に巻き付ける工程、電熱線
    の両端に通電用のターミナルピンを接合する工程、円筒
    状に巻き付けられた電熱線及びターミナルピンを射出成
    形金型のキャビティ内に固定し、射出成形により円筒状
    の芯材に巻き付けられた電熱線の内側に熱可塑性樹脂を
    射出して円筒状の芯材の内側に管路閉塞用キャップ本体
    を成形し、冷却固化する工程、円筒状の芯材の内側に管
    路閉塞用キャップ本体が設けられたものを射出成形金型
    から取り出した後、固定用治具内に挿入して固定し、高
    周波誘電加熱により電熱線を加熱し電熱線に被覆された
    熱可塑性樹脂と熱可塑性樹脂製芯材とを溶着させる工程
    とからなることを特徴とする管路閉塞用キャップの製造
    方法。
JP7000199A 1995-01-05 1995-01-05 管路閉塞用キャップの製造方法 Pending JPH08187800A (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7000199A JPH08187800A (ja) 1995-01-05 1995-01-05 管路閉塞用キャップの製造方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7000199A JPH08187800A (ja) 1995-01-05 1995-01-05 管路閉塞用キャップの製造方法

Publications (1)

Publication Number Publication Date
JPH08187800A true JPH08187800A (ja) 1996-07-23

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ID=11467320

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Country Status (1)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015008028A1 (en) * 2013-07-18 2015-01-22 Pioneer Lining Technology Limited Improved electrofusion fittng methods
JP2021001618A (ja) * 2019-06-20 2021-01-07 日立金属株式会社 電気融着プラグ

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015008028A1 (en) * 2013-07-18 2015-01-22 Pioneer Lining Technology Limited Improved electrofusion fittng methods
US10047892B2 (en) 2013-07-18 2018-08-14 Pioneer Lining Technology Limited Electrofusion fitting methods
EP3556542A1 (en) * 2013-07-18 2019-10-23 Pioneer Lining Technology Limited Improved electrofusion fitting methods
US10533690B2 (en) 2013-07-18 2020-01-14 Pioneer Lining Technology Limited Electrofusion fitting methods
JP2021001618A (ja) * 2019-06-20 2021-01-07 日立金属株式会社 電気融着プラグ

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