[go: up one dir, main page]
More Web Proxy on the site http://driver.im/

JP2639078B2 - Electrofusion fittings - Google Patents

Electrofusion fittings

Info

Publication number
JP2639078B2
JP2639078B2 JP1075955A JP7595589A JP2639078B2 JP 2639078 B2 JP2639078 B2 JP 2639078B2 JP 1075955 A JP1075955 A JP 1075955A JP 7595589 A JP7595589 A JP 7595589A JP 2639078 B2 JP2639078 B2 JP 2639078B2
Authority
JP
Japan
Prior art keywords
thermoplastic resin
crosslinked
resin 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.)
Expired - Lifetime
Application number
JP1075955A
Other languages
Japanese (ja)
Other versions
JPH02253095A (en
Inventor
寛之 西村
明雄 中芝
文夫 長谷
和憲 水戸
利夫 柴渕
幹夫 中岡
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.)
Shinwa Sangyo Co Ltd
Original Assignee
Shinwa Sangyo 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 Shinwa Sangyo Co Ltd filed Critical Shinwa Sangyo Co Ltd
Priority to JP1075955A priority Critical patent/JP2639078B2/en
Priority to US07/462,717 priority patent/US5150922A/en
Priority to CA002007520A priority patent/CA2007520C/en
Priority to DK90300307.7T priority patent/DK0378406T3/en
Priority to EP90300307A priority patent/EP0378406B1/en
Priority to ES90300307T priority patent/ES2075877T3/en
Priority to DE69019998T priority patent/DE69019998T2/en
Priority to DE69032332T priority patent/DE69032332T2/en
Priority to AT93118038T priority patent/ATE166442T1/en
Priority to AT90300307T priority patent/ATE123860T1/en
Priority to EP93118038A priority patent/EP0585974B1/en
Publication of JPH02253095A publication Critical patent/JPH02253095A/en
Priority to US07/913,632 priority patent/US5366253A/en
Priority to US08/067,083 priority patent/US5375889A/en
Application granted granted Critical
Publication of JP2639078B2 publication Critical patent/JP2639078B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/97—Checking completion of joining or correct joining by using indications on at least one of the joined parts
    • B29C66/972—Checking completion of joining or correct joining by using indications on at least one of the joined parts by extrusion of molten material
    • 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
    • B29C66/01—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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/912—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux
    • B29C66/9121—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature
    • B29C66/91211—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature with special temperature measurement means or methods
    • B29C66/91218—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature with special temperature measurement means or methods using colour change, e.g. using separate colour indicators
    • 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/912—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux
    • B29C66/9121—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature
    • B29C66/91221—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature of the parts to be joined

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Branch Pipes, Bends, And The Like (AREA)

Description

【発明の詳細な説明】 〔産業上の利用分野〕 この発明はポリオレフィンパイプ等の被接合体、特に
温水用の導管を融着により完全に接合するためのエレク
トロフュージョン継手に関するものである。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrofusion joint for completely joining objects to be joined such as polyolefin pipes, particularly a conduit for hot water by fusion.

〔従来の技術〕[Conventional technology]

温水用の導管として、シラン架橋ポリエチレン等の架
橋ポリオレフィンパイプが使用されている。この架橋ポ
リオレフィンは耐熱性、高温クリープ特性などの高温性
能に優れ、形状保持性能を有するが、非架橋ポリオレフ
ィンとは異なり、被接合体に融着を行うことができな
い。従って非架橋のポリオレフィンパイプの継手として
使用されているエレクトロフュージョン継手を、架橋ポ
リオレフィンパイプの継手として利用することはできな
い。また架橋ポリオレフィンを使用してエレクトロフュ
ージョン継手を形成することもできない。A crosslinked polyolefin pipe such as silane crosslinked polyethylene is used as a conduit for hot water. This crosslinked polyolefin is excellent in high-temperature performance such as heat resistance and high-temperature creep properties, and has shape retention performance, but unlike a non-crosslinked polyolefin, it cannot be fused to an object to be joined. Therefore, an electrofusion joint used as a joint of a non-crosslinked polyolefin pipe cannot be used as a joint of a crosslinked polyolefin pipe. Also, an electrofusion joint cannot be formed using a crosslinked polyolefin.

従って架橋ポリオレフィンパイプを接合するための継
手、あるいは架橋ポリオレフィンを用いた継手として
は、機械的な接合を行う継手が使用されている。ところ
が温水管の場合は使用圧力が高く、強度が要求されるた
め構造的に複雑となり、配管の作業性が悪いとともに、
圧縮によるシールを行うため、管およびシール材の応力
緩和によるシール性能の低下など、長期的な性能低下が
起こるという問題点がある。Therefore, as a joint for joining a crosslinked polyolefin pipe or a joint using a crosslinked polyolefin, a joint for performing mechanical joining is used. However, in the case of hot water pipes, the working pressure is high and the strength is required, which complicates the structure, and the workability of the piping is poor,
Since sealing is performed by compression, there is a problem that long-term performance degradation occurs, such as degradation of sealing performance due to stress relaxation of the pipe and the sealing material.

一方、従来の熱可塑性樹脂より形成されたエレクトロ
フュージョン継手として、被接合体を融着により接合し
た後に、被接合体が完全に融着されたかどうかを確認す
るために、継手本体に細孔を設け、融着時にその細孔か
ら内部の溶融樹脂が膨出するようにしたエレクトロフュ
ージョン継手が公知である（例えば特開昭61−62696
号）。On the other hand, as an electrofusion joint formed from a conventional thermoplastic resin, after joining the objects to be joined by fusion, a pore is formed in the joint body in order to confirm whether or not the objects to be joined are completely fused. An electrofusion joint is known in which a molten resin is swelled from the pores at the time of fusing (for example, Japanese Patent Application Laid-Open No. 61-62696).
issue).

しかしながら、このような従来のエレクトロフュージ
ョン継手は、一種の熱可塑性樹脂により成形されている
ため、膨出する樹脂がその周りの継手を形成する樹脂と
同色であり、膨出を確認しにくく、融着完了時点を正確
に検出できないなどの問題点がある。However, since such a conventional electrofusion joint is formed of a kind of thermoplastic resin, the swelling resin has the same color as the resin forming the joint around the swelling resin. There is a problem that it is not possible to accurately detect the point of completion of arrival.

〔発明が解決しようとする課題〕[Problems to be solved by the invention]

本発明の目的は上記問題点を解決するため、架橋熱可
塑性樹脂を使用して耐熱強度を高め、継手の融着完了時
点の確認を行い易く、これにより被接合体を完全に融着
して、シール性が高く、作業性も良好なエレクトロフュ
ージョン継手を提供することである。The object of the present invention is to solve the above problems by using a crosslinked thermoplastic resin to increase the heat resistance, and to easily confirm the completion of the fusion of the joint, thereby completely welding the joined body. An object of the present invention is to provide an electrofusion joint having high sealing properties and good workability.

〔課題を解決するための手段〕[Means for solving the problem]

本発明は、表層または全体が熱可塑性樹脂からなる被
接続体を接続するための継手であって、 継手本体を形成する管状の架橋熱可塑性樹脂層と、 この架橋熱可塑性樹脂層の内側の被接合体に接する位
置に、架橋熱可塑性樹脂層とは異なる色の樹脂により一
体的に形成された非架橋熱可塑性樹脂層と、 この非架橋熱可塑性樹脂層の内部、外表面、または内
表面に設けられた電熱線と、 前記架橋熱可塑性樹脂層の外表面から非架橋熱可塑性
樹脂層との境界付近まで達する細孔とを有するエレクト
ロフュージョン継手である。The present invention relates to a joint for connecting a connected object whose surface layer or the whole is made of a thermoplastic resin, wherein a tubular cross-linked thermoplastic resin layer forming a joint main body, and a coating inside the cross-linked thermoplastic resin layer are provided. A non-crosslinked thermoplastic resin layer integrally formed of a resin of a different color from the crosslinked thermoplastic resin layer at a position in contact with the joined body, and an inner, outer, or inner surface of the noncrosslinked thermoplastic resin layer. An electrofusion joint having the provided heating wire and pores extending from the outer surface of the crosslinked thermoplastic resin layer to the vicinity of the boundary with the non-crosslinked thermoplastic resin layer.

本発明では、架橋熱可塑性樹脂層と、この架橋熱可塑
性樹脂層とは異なる色の非架橋熱可塑性樹脂層とが隣接
して一体化している。架橋熱可塑性樹脂は融着性を有し
ないため、架橋後の架橋熱可塑性樹脂と非架橋熱可塑性
樹脂を押出成形、射出成形等により成形しても、それぞ
れの層は分離して一体化しないが、未架橋の架橋性熱可
塑性樹脂と非架橋熱可塑性樹脂とを加熱成形して一体化
し、その後架橋性熱可塑性樹脂を架橋させると、架橋熱
可塑性樹脂と非架橋熱可塑性樹脂が一体化した積層体が
得られる。本発明ではこのように架橋熱可塑性樹脂層と
非架橋熱可塑性樹脂層が一体化した積層体を使用する。In the present invention, the crosslinked thermoplastic resin layer and the non-crosslinked thermoplastic resin layer of a different color from the crosslinked thermoplastic resin layer are adjacently integrated. Since the cross-linked thermoplastic resin does not have a fusibility, even if the cross-linked thermoplastic resin and the non-cross-linked thermoplastic resin after cross-linking are molded by extrusion molding, injection molding, etc., each layer is not separated and integrated. When the uncrosslinked thermoplastic resin and the non-crosslinked thermoplastic resin are heat-molded and integrated, and then the crosslinked thermoplastic resin is crosslinked, the laminate in which the crosslinked thermoplastic resin and the noncrosslinked thermoplastic resin are integrated The body is obtained. In the present invention, a laminate in which the crosslinked thermoplastic resin layer and the non-crosslinked thermoplastic resin layer are integrated as described above is used.

架橋熱可塑性樹脂は、熱可塑性樹脂の分子間架橋によ
り立体構造となったものであり、シラン架橋熱可塑性樹
脂、ジビニルベンゼン架橋熱可塑性樹脂などの架橋剤に
より架橋したもののほか、有機過酸化物、放射線等によ
り直接架橋したものでもよい。The crosslinked thermoplastic resin has a three-dimensional structure due to intermolecular crosslinking of the thermoplastic resin, and in addition to those crosslinked with a crosslinking agent such as a silane crosslinked thermoplastic resin, a divinylbenzene crosslinked thermoplastic resin, an organic peroxide, Those directly crosslinked by radiation or the like may be used.

非架橋熱可塑性樹脂は、一般に熱可塑性樹脂として使
用されている架橋性を有しない熱可塑性樹脂で、架橋ポ
リオレフィン層と異なる色のものである。The non-crosslinked thermoplastic resin is a non-crosslinkable thermoplastic resin generally used as a thermoplastic resin, and has a color different from that of the crosslinked polyolefin layer.

本発明に係わる熱可塑性樹脂としてはポリオレフィン
を例示でき、ポリオレフィンとしては、炭素数２〜20、
好ましくは２〜12のα−オレフィンの単独または共重合
体があげられる。好ましいα−オレフィンとしては、エ
チレン、プロピレン、ブテン−1,4−メチルペンテン−
１などがあげられる。Examples of the thermoplastic resin according to the present invention include polyolefins, and the polyolefins may have 2 to 20 carbon atoms.
Preferably, a homopolymer or a copolymer of 2 to 12 α-olefins is used. Preferred α-olefins include ethylene, propylene, butene-1,4-methylpentene-
1 and the like.

〔作 用〕(Operation)

本発明のエレクトロフュージョン継手は、架橋熱可塑
性樹脂層とは異なる色の非架橋熱可塑性樹脂層の内部、
外表面、または内表面に電熱線を埋設し、あるいは未架
橋熱可塑性樹脂層表面に巻き付けた状態で、架橋性熱可
塑性樹脂層と積層一体化するとともに、細孔を形成した
後、架橋性熱可塑性樹脂層を架橋させて架橋熱可塑性樹
脂層を形成することにより製造される。The electrofusion joint of the present invention has a non-crosslinked thermoplastic resin layer of a different color from the crosslinked thermoplastic resin layer,
With the heating wire buried on the outer surface or inner surface, or wound around the uncrosslinked thermoplastic resin layer surface, it is laminated and integrated with the crosslinkable thermoplastic resin layer, and after forming pores, the crosslinkable heat It is manufactured by crosslinking a thermoplastic resin layer to form a crosslinked thermoplastic resin layer.

こうして製造されたエレクトロフュージョン継手は、
熱可塑性樹脂チューブ等の被接合体の接合部に、非架橋
熱可塑性樹脂層が被接合体と接するように取付け、電熱
線に通電すると、非架橋熱可塑性樹脂層が溶融して被接
合体に一体的に融着する。The electrofusion joint thus manufactured is
The non-crosslinked thermoplastic resin layer is attached to the joint of the object to be joined such as a thermoplastic resin tube so that the non-crosslinked thermoplastic resin layer is in contact with the object to be joined. Fused together.

この融着に際しては、電熱線から供給される熱量で被
架橋熱可塑性樹脂層内が溶融して膨張し、溶融した非架
橋熱可塑性樹脂層の圧力が上昇する。そして十分な融着
条件に達したときに、溶融した非架橋熱可塑性樹脂が細
孔から膨出して融着完了時点を表示する。このとき膨出
する非架橋熱可塑性樹脂は架橋熱可塑性樹脂層とは異な
る色であるため、容易に確認することができる。なお、
架橋熱可塑性樹脂は溶融してもゲル状を保って流出せ
ず、非架橋熱可塑性樹脂のみが流出する。During this fusion, the inside of the crosslinked thermoplastic resin layer melts and expands with the amount of heat supplied from the heating wire, and the pressure of the molten non-crosslinked thermoplastic resin layer increases. Then, when sufficient fusion conditions are reached, the melted non-crosslinked thermoplastic resin swells out of the pores and indicates the time point of completion of fusion. Since the non-crosslinked thermoplastic resin swelling at this time has a different color from the crosslinked thermoplastic resin layer, it can be easily confirmed. In addition,
Even when the crosslinked thermoplastic resin is melted, it does not flow out while maintaining the gel state, and only the non-crosslinked thermoplastic resin flows out.

被接合体としては表層または全体が熱可塑性樹脂、特
に相溶性を有する樹脂からなるものが好ましく、非架橋
の熱可塑性樹脂からなるものは特に優れた融着性を示
す。The object to be joined is preferably one whose surface layer or the whole is made of a thermoplastic resin, particularly a resin having compatibility, and one made of a non-crosslinked thermoplastic resin shows particularly excellent fusion bonding properties.

〔実施例〕〔Example〕

以下、本発明の実施例を図面により説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

第１図は実施例のエレクトロフュージョン継手の右半
分を断面で示す正面図であり、左右対称に構成されてい
る。図において、１はエレクトロフュージョン継手で、
継手本体を形成する管状の架橋ポリオレフィン層２と、
この架橋ポリオレフィン層２の内側の被接合体５、６に
接する位置に、架橋ポリオレフィン層２とは異なる色の
樹脂により一体的に形成された非架橋ポリオレフィン層
３と、この非架橋ポリオレフィン層３の内部に設けられ
たコイル形状の電熱線４と、架橋ポリオレフィン層２の
外表面から非架橋ポリオレフィン層３との境界付近まで
達する細孔７とを有する。FIG. 1 is a front view showing a cross section of the right half of the electrofusion joint of the embodiment, which is configured symmetrically. In the figure, 1 is an electrofusion joint,
A tubular cross-linked polyolefin layer 2 forming a joint body;
A non-crosslinked polyolefin layer 3 integrally formed of a resin having a color different from that of the crosslinked polyolefin layer 2 at a position inside the crosslinked polyolefin layer 2 in contact with the objects 5 and 6, It has a coil-shaped heating wire 4 provided therein and pores 7 reaching from the outer surface of the crosslinked polyolefin layer 2 to near the boundary with the non-crosslinked polyolefin layer 3.

被接合体５、６はポリエチレン等の熱可塑性樹脂層を
有する管からなり、全体が融着性の熱可塑性樹脂からな
るものでもよいが、架橋ポリオレフィン等の耐熱性材料
を用いる場合は、外表面を融着性の熱可塑性樹脂で被覆
したものを用いる。架橋ポリオレフィン層２は被接合体
５、６の突合せ部８付近を全周にわたって覆う管状の構
造であり、その長手方向の両側の各被接合体５、６に対
応する部分の内周に非架橋ポリオレフィン層３が積層さ
れ、その中に電熱線４が埋設されている。細孔７は架橋
ポリオレフィン層２の外表面から非架橋ポリオレフィン
層３の手前まで伸びている。The members to be joined 5 and 6 are made of a tube having a thermoplastic resin layer such as polyethylene, and may be entirely made of a fusible thermoplastic resin. Coated with a fusible thermoplastic resin. The crosslinked polyolefin layer 2 has a tubular structure that covers the vicinity of the butted portion 8 of the joined bodies 5 and 6 over the entire circumference, and non-crosslinked at the inner periphery of a portion corresponding to each of the joined bodies 5 and 6 on both sides in the longitudinal direction. A polyolefin layer 3 is laminated, and a heating wire 4 is embedded therein. The pores 7 extend from the outer surface of the crosslinked polyolefin layer 2 to just before the non-crosslinked polyolefin layer 3.

上記のエレクトロフュージョン継手１は、非架橋ポリ
オレフィン層３中に電熱線４を埋設した状態で、ポリオ
レフィン中に架橋剤、架橋助剤等を含む架橋性ポリオレ
フィン層と積層一体化するとともに、細孔７を形成した
後、上記架橋性ポリオレフィン層を架橋させて架橋ポリ
オレフィン層２を形成することにより製造される。The above-mentioned electrofusion joint 1 is laminated and integrated with a crosslinkable polyolefin layer containing a crosslinking agent, a crosslinking assistant and the like in a polyolefin in a state in which the heating wire 4 is embedded in the non-crosslinked polyolefin layer 3, and has pores 7. Is formed by crosslinking the crosslinkable polyolefin layer to form a crosslinked polyolefin layer 2.

こうして製造されたエレクトロフュージョン継手１
は、ポリオレフィンチューブ等の被接合体５、６の突合
せ部８付近に、非架橋ポリオレフィン層３が被接合体
５、６と接するように取付け、電熱線４に通電すると、
非架橋ポリオレフィン層３が溶融して被接合体５、６に
融着して一体化する。Electrofusion joint 1 thus manufactured
The non-crosslinked polyolefin layer 3 is attached near the abutting portion 8 of the joined objects 5 and 6 such as polyolefin tubes so as to be in contact with the joined objects 5 and 6, and when the heating wire 4 is energized,
The non-crosslinked polyolefin layer 3 is melted and fused to the objects 5 and 6 to be integrated.

この融着に際しては、電熱線４から供給される熱で非
架橋ポリオレフィン層３が溶融して膨張し、溶融した非
架橋ポリオレフィン層３内の圧力が上昇する。そして十
分な融着条件に達したときに、溶融した非架橋ポリオレ
フィンが細孔７から膨出して融着完了時点で表示する。
このとき膨出する非架橋ポリオレフィンは架橋ポリオレ
フィン層２とは異なる色であるため、容易に確認するこ
とができる。なお、架橋ポリオレフィン層２は溶融して
もゲル状を保って流出せず、非架橋ポリオレフィンのみ
が流出するので、融着完了時点の表示は正確であり、こ
の時点で電熱線４への通電を停止することができる。In this fusion, the non-crosslinked polyolefin layer 3 is melted and expanded by the heat supplied from the heating wire 4, and the pressure in the melted non-crosslinked polyolefin layer 3 increases. Then, when sufficient fusion conditions are reached, the molten non-crosslinked polyolefin swells from the pores 7 and is displayed when fusion is completed.
The non-crosslinked polyolefin that swells at this time has a color different from that of the crosslinked polyolefin layer 2 and can be easily confirmed. The crosslinked polyolefin layer 2 remains in a gel state even when it is melted and does not flow out, and only the non-crosslinked polyolefin flows out. Therefore, the indication of the completion of the fusion is accurate. Can be stopped.

上記のエレクトロフュージョン継手１は、継手本体を
形成する管状の架橋ポリオレフィン層２が耐熱強度を負
担するので、給湯管等の接合に用いても形状保持性に優
れる。一方非架橋ポリオレフィン層３が架橋ポリオレフ
ィン層２と一体化した状態で、被接合体５、６に融着し
て一体化するため、シール性に優れ、給湯管に用いても
長期にわたってシール性を保持する。In the above-mentioned electrofusion joint 1, the tubular cross-linked polyolefin layer 2 forming the joint main body bears heat resistance, so that it is excellent in shape retention even when used for joining a hot water supply pipe or the like. On the other hand, in a state where the non-crosslinked polyolefin layer 3 is integrated with the crosslinked polyolefin layer 2, the non-crosslinked polyolefin layer 3 is fused and integrated with the joined objects 5 and 6, so that the sealing property is excellent and the sealing property is maintained for a long time even when used for a hot water supply pipe. Hold.

なお、上記の実施例では継手は左右対称となるよう
に、両側に非架橋ポリオレフィン層３および電熱線４を
設けた例を示したが、片側例えば第１図の右側を図のよ
うに構成し、反対側例えば左側にはねじ等の接続部を有
する接続部材を取付けて被接合体と機械的に接合するよ
うにしても良い。また電熱線４は、非架橋ポリオレフィ
ン層３の外表面または内表面に形成しても良い。In the above-described embodiment, an example is shown in which the non-crosslinked polyolefin layer 3 and the heating wire 4 are provided on both sides so that the joint is bilaterally symmetrical. However, one side, for example, the right side of FIG. On the other side, for example, on the left side, a connecting member having a connecting portion such as a screw may be attached so as to be mechanically joined to the joined object. The heating wire 4 may be formed on the outer surface or the inner surface of the non-crosslinked polyolefin layer 3.

〔発明の効果〕〔The invention's effect〕

本発明によれば、架橋熱可塑性樹脂層に一体化した、
架橋熱可塑性樹脂層とは異なる色の非架橋熱可塑性樹脂
層の内部、外表面、または内表面に電熱線を設け、前記
架橋熱可塑性樹脂層の外表面から非架橋熱可塑性樹脂層
との境界付近まで達する細孔を設けることにより、継手
の融着完了時点において架橋熱可塑性樹脂層とは異なる
色の溶融樹脂が細孔から膨出するため、これを直接視覚
により確認することができ、このため継手の融着完了時
点を容易かつ正確に確認でき、これにより被接合体を完
全に融着して、耐熱強度等の高温性能およびシール性に
優れ、かつ取付作業等の作業性にも優れたエレクトロフ
ュージョン継手が得られる。According to the present invention, integrated with the crosslinked thermoplastic resin layer,
A heating wire is provided on the inside, outside surface, or inside surface of the non-crosslinked thermoplastic resin layer of a different color from the crosslinked thermoplastic resin layer, and a boundary between the outer surface of the crosslinked thermoplastic resin layer and the non-crosslinked thermoplastic resin layer. By providing the pores reaching up to the vicinity, the molten resin of a color different from the crosslinked thermoplastic resin layer swells from the pores at the time of completion of fusion of the joint, so that this can be directly visually confirmed. Therefore, it is possible to easily and accurately check the completion point of fusion of the joint, thereby completely welding the joined body, and having excellent high-temperature performance such as heat resistance and sealing performance, and excellent workability such as installation work. The resulting electrofusion joint is obtained.

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

第１図は実施例の一部を断面で示す正面図である。 図中、２は架橋ポリオレフィン層、３は非架橋ポリオレ
フィン層、４は電熱線、５、６は被接合体、７は細孔で
ある。FIG. 1 is a front view showing a part of the embodiment in cross section. In the figure, 2 is a crosslinked polyolefin layer, 3 is a non-crosslinked polyolefin layer, 4 is a heating wire, 5 and 6 are objects to be joined, and 7 is pores.

───────────────────────────────────────────────────── フロントページの続き (72)発明者 中芝 明雄 大阪府大阪市中央区平野町４丁目１番２ 号 大阪瓦斯株式会社内 (72)発明者 長谷 文夫 山口県玖珂郡和木町和木６丁目１番２号 三井石油化学工業株式会社内 (72)発明者 水戸 和憲 山口県玖珂郡和木町和木６丁目１番２号 三井石油化学工業株式会社内 (72)発明者 柴渕 利夫 大阪府大阪市住之江区南加賀屋２丁目10 番16号 新和産業株式会社内 (72)発明者 中岡 幹夫 大阪府大阪市住之江区南加賀屋２丁目10 番16号 新和産業株式会社内 (56)参考文献 実開 昭56−55188（ＪＰ，Ｕ) 仏国特許出願公開2606487（ＦＲ，Ａ １) ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Akio Nakashiba 4-1-2, Hirano-cho, Chuo-ku, Osaka-shi, Osaka Osaka Gas Co., Ltd. (72) Inventor Fumio Hase 6 Waki, Waki-cho, Kuga-gun, Yamaguchi Prefecture Mitsui Petrochemical Industry Co., Ltd. (72) Inventor Kazunori Mito 61-2, Waki, Waki-machi, Kuga-gun, Yamaguchi Prefecture Mitsui Petrochemical Industry Co., Ltd. (72) Inventor Toshio Shibuchi Osaka Prefecture 2-10-16 Minamikagaya, Suminoe-ku, Osaka Shinwa Sangyo Co., Ltd. (72) Inventor Mikio Nakaoka 2-10-16 Minamikagaya, Suminoe-ku, Osaka, Osaka Shinwa Sangyo Co., Ltd. (56) References Shokai 56-55188 (JP, U) Published French Patent Application 2606487 (FR, A1)

Claims (1)

(57)【特許請求の範囲】(57) [Claims] 【請求項１】表層または全体が熱可塑性樹脂からなる被
接続体を接続するための継手であって、 継手本体を形成する管状の架橋熱可塑性樹脂層と、 この架橋熱可塑性樹脂層の内側の被接合体に接する位置
に、架橋熱可塑性樹脂層とは異なる色の樹脂により一体
的に形成された非架橋熱可塑性樹脂層と、 この非架橋熱可塑性樹脂層の内部、外表面、または内表
面に設けられた電熱線と、 前記架橋熱可塑性樹脂層の外表面から非架橋熱可塑性樹
脂層との境界付近まで達する細孔とを有するエレクトロ
フュージョン継手。1. A joint for connecting a connected object whose surface layer or the whole is made of a thermoplastic resin, wherein a tubular cross-linked thermoplastic resin layer forming a joint main body and an inner portion of the cross-linked thermoplastic resin layer are provided. A non-crosslinked thermoplastic resin layer integrally formed of a resin of a color different from that of the crosslinked thermoplastic resin layer at a position in contact with the joined object; and an inner, outer, or inner surface of the noncrosslinked thermoplastic resin layer. An electrofusion joint comprising: a heating wire provided in the above; and pores extending from the outer surface of the crosslinked thermoplastic resin layer to near the boundary with the non-crosslinked thermoplastic resin layer.
JP1075955A 1989-01-11 1989-03-28 Electrofusion fittings Expired - Lifetime JP2639078B2 (en)

Priority Applications (13)

Application Number Priority Date Filing Date Title
JP1075955A JP2639078B2 (en) 1989-03-28 1989-03-28 Electrofusion fittings
US07/462,717 US5150922A (en) 1989-01-11 1990-01-09 Electrofusion joint and hot water supply header using the same
CA002007520A CA2007520C (en) 1989-01-11 1990-01-10 Electrofusion joint and hot water supply header using the same
EP90300307A EP0378406B1 (en) 1989-01-11 1990-01-11 Electrofusion joint and hot water supply header using the same
ES90300307T ES2075877T3 (en) 1989-01-11 1990-01-11 ELECTROFUSION UNION AND COLLECTOR OF HOT WATER SUPPLY THAT USES IT.
DE69019998T DE69019998T2 (en) 1989-01-11 1990-01-11 Electric welding connection and its use in a hot water distributor.
DK90300307.7T DK0378406T3 (en) 1989-01-11 1990-01-11 Electro-melt collection and hot water supply collector pipes using the same
DE69032332T DE69032332T2 (en) 1989-01-11 1990-01-11 Electric welding connection and its use in a hot water distributor
AT93118038T ATE166442T1 (en) 1989-01-11 1990-01-11 ELECTROWELDING JOINT AND USE THEREOF IN A HOT WATER DISTRIBUTOR
AT90300307T ATE123860T1 (en) 1989-01-11 1990-01-11 ELECTROWELDING JOINT AND USE THEREOF IN A HOT WATER DISTRIBUTOR.
EP93118038A EP0585974B1 (en) 1989-01-11 1990-01-11 Electrofusion joint and hot water supply header using the same
US07/913,632 US5366253A (en) 1989-01-11 1992-07-16 Electrofusion joint and hot water supply header using the same
US08/067,083 US5375889A (en) 1989-01-11 1993-05-26 Electrofusion joint and hot water supply header using the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1075955A JP2639078B2 (en) 1989-03-28 1989-03-28 Electrofusion fittings

Publications (2)

Publication Number Publication Date
JPH02253095A JPH02253095A (en) 1990-10-11
JP2639078B2 true JP2639078B2 (en) 1997-08-06

Family

ID=13591157

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1075955A Expired - Lifetime JP2639078B2 (en) 1989-01-11 1989-03-28 Electrofusion fittings

Country Status (1)

Country Link
JP (1) JP2639078B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7305327B2 (en) * 2018-09-28 2023-07-10 積水化学工業株式会社 Electrofusion joint, piping structure, and method for manufacturing electrofusion joint

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2606487A1 (en) 1986-11-07 1988-05-13 Silix Tubes based on a polyolefin-type resin for producing pipelines, sleeves for assembling them and method for manufacturing them

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5655188U (en) * 1979-10-04 1981-05-14

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2606487A1 (en) 1986-11-07 1988-05-13 Silix Tubes based on a polyolefin-type resin for producing pipelines, sleeves for assembling them and method for manufacturing them

Also Published As

Publication number Publication date
JPH02253095A (en) 1990-10-11

Similar Documents

Publication Publication Date Title
EP0585974B1 (en) Electrofusion joint and hot water supply header using the same
US6245174B1 (en) Heat recoverable article
US6998588B2 (en) Heat fusion fitting
JP2639078B2 (en) Electrofusion fittings
JP2868091B2 (en) Electrofusion fitting with connecting member
EP1388703A1 (en) Fitting for composite pipe
JP2545973B2 (en) Electrofusion fittings
JP2935421B2 (en) Electrofusion fittings
JP2704990B2 (en) Electrofusion fittings
JP2639079B2 (en) Electrofusion fittings
JP2868018B2 (en) Electrofusion pipe
JP2868092B2 (en) Electrofusion fittings
JP2687561B2 (en) Electrofusion joint with connecting member
JP2545972B2 (en) Electrofusion fittings
JP2536618B2 (en) Electrofusion fitting with connecting member
JP2639080B2 (en) Electrofusion fittings
GB2340904A (en) Method of forming fusion joint and fusion fitting for joint
JP2545971B2 (en) Electrofusion fittings
JPH02186193A (en) Electrofusion coupling
JP2887275B2 (en) Method of manufacturing header for hot water supply
JPH09229281A (en) Electrofusion coupling and thermoplastic resin pipe
JPH11344191A (en) Method for connecting polyethylene pipe by electrofusion fitting
JPH07317986A (en) Renewal pipe
JP2000191799A (en) Juncture of resin product and resin product juncture
JPH08270869A (en) Electro-fusion joint

Legal Events

Date Code Title Description
R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20080425

Year of fee payment: 11

S111 Request for change of ownership or part of ownership

Free format text: JAPANESE INTERMEDIATE CODE: R313117

R371 Transfer withdrawn

Free format text: JAPANESE INTERMEDIATE CODE: R371

S531 Written request for registration of change of domicile

Free format text: JAPANESE INTERMEDIATE CODE: R313531

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20080425

Year of fee payment: 11

S111 Request for change of ownership or part of ownership

Free format text: JAPANESE INTERMEDIATE CODE: R313117

R350 Written notification of registration of transfer

Free format text: JAPANESE INTERMEDIATE CODE: R350

R350 Written notification of registration of transfer

Free format text: JAPANESE INTERMEDIATE CODE: R350

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20090425

Year of fee payment: 12

EXPY Cancellation because of completion of term