JP2536618B2 - Electrofusion fitting with connecting member - Google Patents

Electrofusion fitting with connecting member

Info

Publication number
JP2536618B2
JP2536618B2 JP1072332A JP7233289A JP2536618B2 JP 2536618 B2 JP2536618 B2 JP 2536618B2 JP 1072332 A JP1072332 A JP 1072332A JP 7233289 A JP7233289 A JP 7233289A JP 2536618 B2 JP2536618 B2 JP 2536618B2
Authority
JP
Japan
Prior art keywords
thermoplastic resin
crosslinked
connecting member
resin layer
connected body
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
JP1072332A
Other languages
Japanese (ja)
Other versions
JPH02253090A (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 JP1072332A priority Critical patent/JP2536618B2/en
Priority to US07/462,717 priority patent/US5150922A/en
Priority to CA002007520A priority patent/CA2007520C/en
Priority to AT93118038T priority patent/ATE166442T1/en
Priority to DE69032332T priority patent/DE69032332T2/en
Priority to DE69019998T priority patent/DE69019998T2/en
Priority to DK90300307.7T priority patent/DK0378406T3/en
Priority to EP93118038A priority patent/EP0585974B1/en
Priority to EP90300307A priority patent/EP0378406B1/en
Priority to ES90300307T priority patent/ES2075877T3/en
Priority to AT90300307T priority patent/ATE123860T1/en
Publication of JPH02253090A publication Critical patent/JPH02253090A/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 JP2536618B2 publication Critical patent/JP2536618B2/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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/63—Internally supporting the article during joining
    • B29C66/636—Internally supporting the article during joining using a support which remains in the joined object
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • 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
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/124—Tongue and groove joints
    • B29C66/1244—Tongue and groove joints characterised by the male part, i.e. the part comprising the tongue
    • B29C66/12441—Tongue and groove joints characterised by the male part, i.e. the part comprising the tongue being a single wall
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/522—Joining tubular articles
    • B29C66/5229—Joining tubular articles involving the use of a socket
    • B29C66/52291—Joining tubular articles involving the use of a socket said socket comprising a stop
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—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
    • B29C66/50—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
    • B29C66/5344—Joining single elements to open ends of tubular or hollow articles or to the ends of bars said single elements being substantially annular, i.e. of finite length, e.g. joining flanges to tube ends
    • 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
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/56—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using mechanical means or mechanical connections, e.g. form-fits
    • B29C65/561—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using mechanical means or mechanical connections, e.g. form-fits using screw-threads being integral at least to one of the parts to be joined
    • 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
    • B29C66/70—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
    • B29C66/74—Joining plastics material to non-plastics material
    • B29C66/742—Joining plastics material to non-plastics material to metals or their alloys

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続体、特に
温水用の導管を、導管ヘッダーのノズル等の接続端末に
接続するための接続部材付エレクトロフュージョン継手
に関するものである。Description: TECHNICAL FIELD The present invention relates to an electrofusion with a connecting member for connecting an object to be connected such as a polyolefin pipe, especially a conduit for hot water to a connecting terminal such as a nozzle of a conduit header. It concerns a joint.

〔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、被接続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。As a conduit for hot water, a crosslinked polyolefin pipe such as silane crosslinked polyethylene is used. This cross-linked polyolefin has excellent high-temperature performance such as heat resistance and high-temperature creep property and has shape-retaining performance, but unlike the non-cross-linked polyolefin, it cannot be fused to the connection target. Therefore, an electrofusion joint used as a joint for an uncrosslinked polyolefin pipe cannot be used as a joint for a crosslinked polyolefin pipe. Nor can crosslinked polyolefins be used to form electrofusion joints.

従って架橋ポリオレフィンパイプを接続するための継
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 connecting a crosslinked polyolefin pipe or a joint using a crosslinked polyolefin, a joint for mechanical joining is used. However, in the case of hot water pipes, the working pressure is high and strength is required, so it becomes structurally complicated and the workability of the piping is poor,
Since the sealing is performed by compression, there is a problem that long-term performance deterioration occurs such as deterioration of sealing performance due to stress relaxation of the pipe and the sealing material.

また導管ヘッダーのノズル等の接続端末は通常金属製
であるため、このような接続端末と架橋熱可塑性樹脂パ
イプを接続することは困難である。Further, since the connecting terminal such as the nozzle of the conduit header is usually made of metal, it is difficult to connect such a connecting terminal to the crosslinked thermoplastic resin pipe.

さらに一般のエレクトロフュージョン継手では、被接
続体が薄肉の樹脂パイプである場合、接続部が加熱によ
り変形して内側に膨らみ、内部の流路が狭くなるという
問題点がある。Further, in a general electrofusion joint, when the connected body is a thin resin pipe, there is a problem that the connecting portion is deformed by heating and bulges inward, and the internal flow path becomes narrow.

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

本発明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、かつ融着によりシール性
能を高め、しかも融着時の被接続体の変形を防止できる
とともに、架橋熱可塑性樹脂パイプを導管ヘッダーのノ
ズル等の接続端末に容易に接続でき、作業性も良好な接
続部材付エレクトロフュージョン継手を提供することで
ある。In order to solve the above problems, the present invention uses a cross-linking thermoplastic resin to increase the heat resistance strength, and enhances the sealing performance by fusing, and can prevent deformation of the connected body during fusing, and also improve the cross-linking heat resistance. An object of the present invention is to provide an electrofusion joint with a connecting member, which can easily connect a plastic resin pipe to a connecting terminal such as a nozzle of a conduit header and has good workability.

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

本発明は、次の接続部材付エレクトロフュージョン継
手である。The present invention is the following electrofusion joint with a connecting member.

（１） 架橋熱可塑性樹脂層と、この架橋熱可塑性樹脂
層の一端部側の内側の被接続体に接する位置に、架橋熱
可塑性樹脂層と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
層の他端部側の内側に挿入して固着された接続部材と、
前記非架橋熱可塑性樹脂層の内側に被接続体挿入溝を形
成するように設けられた被接続体支持部とを有する接続
部材付エレクトロフュージョン継手。(1) A cross-linked thermoplastic resin layer, and a non-cross-linked thermoplastic resin layer integrally formed with the cross-linked thermoplastic resin layer at a position in contact with an object to be connected inside one end side of the cross-linked thermoplastic resin layer. , Inside of the non-crosslinked thermoplastic resin layer, an outer surface, or a heating wire provided on the inner surface, and a connecting member fixed by being inserted inside the other end side of the crosslinked thermoplastic resin layer,
An electrofusion joint with a connecting member, comprising a connected body supporting portion provided so as to form a connected body insertion groove inside the non-crosslinked thermoplastic resin layer.

（２） 架橋熱可塑性樹脂層は変性熱可塑性樹脂により
接続部材に接着された上記（１）記載の接続部材付エレ
クトロフュージョン継手。(2) The electrofusion joint with a connecting member according to (1) above, wherein the crosslinked thermoplastic resin layer is bonded to the connecting member with a modified thermoplastic resin.

（３） 被接続体支持部は接続部材または架橋熱可塑性
樹脂層と一体的に形成された上記（１）または（２）記
載の接続部材付エレクトロフュージョン継手。(3) The electrofusion joint with a connecting member according to the above (1) or (2), wherein the connected body supporting portion is integrally formed with the connecting member or the crosslinked thermoplastic resin layer.

本発明においては、架橋熱可塑性樹脂層の一端部と非
架橋熱可塑性樹脂層とは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, one end of the crosslinked thermoplastic resin layer and the non-crosslinked thermoplastic resin layer are adjacently integrated with each other. Since the crosslinked thermoplastic resin does not have a fusion property, even if the crosslinked thermoplastic resin and the non-crosslinked thermoplastic resin after crosslinking are molded by extrusion molding, injection molding, etc., the respective layers are not separated and integrated. , A non-crosslinked thermoplastic resin and a non-crosslinked thermoplastic resin are heat-molded and integrated, and then the crosslinkable thermoplastic resin is crosslinked to form a laminate in which the crosslinked thermoplastic resin and the non-crosslinked 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。Crosslinked thermoplastic resin has a three-dimensional structure due to intermolecular crosslinking of the thermoplastic resin, silane crosslinked thermoplastic resin, in addition to those crosslinked with a crosslinking agent such as divinylbenzene crosslinked thermoplastic resin, organic peroxide, It may be directly cross-linked by radiation or the like.

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ポリオレフィン等の熱可塑
性樹脂である。The non-crosslinked thermoplastic resin is a thermoplastic resin such as polyolefin which is generally used as a thermoplastic resin and has no crosslinkability.

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。The thermoplastic resin according to the present invention can be exemplified by polyolefin, and the polyolefin has 2 to 20 carbon atoms,
Preferred is a homopolymer or copolymer of 2 to 12 α-olefins. Preferred α-olefins include ethylene, propylene, butene-1, 4-methylpentene-1 and the like.

接続部材としては、ねじ等の接続端末への接続部を一
端に有する金属管などが使用できる。接続部材と架橋熱
可塑性樹脂層との固着は、変性熱可塑性樹脂等の接着性
材料により接着するのが好ましい。接着性材料は接続部
材と架橋熱可塑性樹脂層との間に介在させるのが好まし
いが、架橋熱可塑性樹脂層に分散していてもよい。As the connecting member, a metal tube having a connecting portion such as a screw to a connecting terminal at one end can be used. The connection member and the crosslinked thermoplastic resin layer are preferably fixed by an adhesive material such as a modified thermoplastic resin. The adhesive material is preferably interposed between the connecting member and the crosslinked thermoplastic resin layer, but may be dispersed in the crosslinked thermoplastic resin layer.

変性熱可塑性樹脂としては、ポリオレフィンをアクリ
ル酸、マレイン酸などの不飽和カルボン酸；無水マレイ
ン酸などの不飽和カルボン酸無水物；不飽和カルボン酸
のアミド；グリシジルメタクリレートなどの不飽和エポ
キシド等の変性モノマーでグラフト共重合することによ
って変性したものがある。変性熱可塑性樹脂中の変性モ
ノマーの含有量は変性熱可塑性樹脂に対し0.001ないし
５重量％の範囲であることが望ましい。As the modified thermoplastic resin, polyolefin is modified with unsaturated carboxylic acid such as acrylic acid and maleic acid; unsaturated carboxylic acid anhydride such as maleic anhydride; amide of unsaturated carboxylic acid; unsaturated epoxide such as glycidyl methacrylate. Some have been modified by graft copolymerization with monomers. The content of the modified monomer in the modified thermoplastic resin is preferably in the range of 0.001 to 5% by weight based on the modified thermoplastic resin.

被接続体支持部は接続部材または架橋熱可塑性樹脂層
と一体的に形成するのが望ましいが、他の材質により形
成してもよい。被接続体挿入溝はエレクトロフュージョ
ン継手の一端部に開口するように形成する。It is desirable that the connected body supporting portion is formed integrally with the connecting member or the crosslinked thermoplastic resin layer, but it may be formed of another material. The connected body insertion groove is formed so as to open at one end of the electrofusion joint.

〔作 用〕[Work]

本発明の接続部材付エレクトロフュージョン継手は、
内部、外表面、または内表面に電熱線を配置した非架橋
熱可塑性樹脂層と、変性熱可塑性樹脂等の接着性材料を
コーティングした接続部材とを射出成形型内にインサー
トした状態で、架橋性熱可塑性樹脂を射出して積層一体
化した後、架橋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。この場合、
接着性材料は接続部材にコーティングせず、射出する架
橋熱可塑性樹脂中に分散させておいてもよい。また被接
続体支持部はあらかじめ接続部材と一体的に形成してお
くか、あるいは架橋熱可塑性樹脂層を形成する架橋性熱
可塑性樹脂層と一体的に形成することができる。The electrofusion joint with the connecting member of the present invention,
Crosslinking is possible with the non-crosslinking thermoplastic resin layer having heating wires arranged on the inner, outer surface, or inner surface, and the connecting member coated with an adhesive material such as modified thermoplastic resin inserted in the injection mold. It is manufactured by injecting a thermoplastic resin to integrate and laminate, and then crosslinking the crosslinked thermoplastic resin layer to form a crosslinked thermoplastic resin layer. in this case,
The adhesive material may not be coated on the connecting member but may be dispersed in the cross-linked thermoplastic resin to be injected. In addition, the connected body supporting portion can be formed integrally with the connecting member in advance, or can be formed integrally with the crosslinkable thermoplastic resin layer forming the 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、
導管ヘッダーのノズル等の接続端末に接続部材を接続
し、熱可塑性樹脂チューブ等の被接続体の端部を被接続
体挿入溝に挿入して、非架橋熱可塑性樹脂層と接し、か
つ被接続体支持部で支持されるように取付け、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続体
に一体的に融着する。これにより金属製の接続端末と樹
脂製の被接続体とを、漏洩防止状態で確実に接続するこ
とができる。The electrofusion joint manufactured in this way is
Connect the connecting member to the connection terminal such as the nozzle of the conduit header, insert the end of the connected body such as thermoplastic resin tube into the connected body insertion groove, contact the non-crosslinked thermoplastic resin layer, and connect When the heating wire is attached so as to be supported by the body supporting portion and the heating wire is energized, the non-crosslinked thermoplastic resin layer is melted and integrally fused to the connected body. This makes it possible to reliably connect the metal connection terminal and the resin connection target in a leak-proof state.

この融着に際して、熱可塑性樹脂チューブ等の被接続
体は非架橋熱可塑性樹脂層の溶融に伴い軟化するが、被
接続体支持部により被接続体の内面が支持されているた
め変形することがない。At the time of this fusion, the connected body such as a thermoplastic resin tube is softened by the melting of the non-crosslinked thermoplastic resin layer, but may be deformed because the inner surface of the connected body is supported by the connected body supporting portion. Absent.

被接続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。It is preferable that the surface layer or the whole of the object to be connected is made of a thermoplastic resin, particularly a resin having compatibility, and a material made of a non-crosslinked thermoplastic resin exhibits particularly excellent fusion bondability.

〔実施例〕〔Example〕

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

第１図ないし第３図は別の実施例の接続部材付エレク
トロフュージョン継手の断面図である。図において、１
はエレクトロフュージョン継手で、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の一端部側
の内側の被接続体５に接する位置に、架橋ポリオレフィ
ン層２と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、外表面また
は内表面に設けられた電熱線４と、架橋ポリオレフィン
層２の他端部側の内側に挿入して固着された接続部材６
と、この接続部材６の挿入部6aと架橋ポリオレフィン層
２の間に介在する接着性材料としての変性ポリオレフィ
ン層７と、非架橋ポリオレフィン層３の内側に被接続体
挿入溝８を形成するように設けられた被接続体支持部９
とを有する。1 to 3 are cross-sectional views of an electrofusion joint with a connecting member according to another embodiment. In the figure, 1
Is an electrofusion joint, and is a non-crosslinked polyolefin layer formed integrally with the crosslinked polyolefin layer 2 at a position in contact with the tubular crosslinked polyolefin layer 2 and the connected body 5 on the inner side at one end side of the crosslinked polyolefin layer 2. Three
A heating wire 4 provided on the inside, the outer surface or the inner surface of the non-crosslinked polyolefin layer 3 and a connecting member 6 inserted and fixed inside the other end of the crosslinked polyolefin layer 2.
And a modified polyolefin layer 7 as an adhesive material interposed between the insertion part 6a of the connecting member 6 and the crosslinked polyolefin layer 2, and a connected body insertion groove 8 inside the non-crosslinked polyolefin layer 3. Connected body support portion 9 provided
And

被接続体５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。The connected body 5 is made of a pipe having a thermoplastic resin layer such as polyethylene, and may be made entirely of a fusible thermoplastic resin. However, when a heat resistant material such as crosslinked polyolefin is used, the outer surface is melted. The one coated with an adhesive thermoplastic resin is used.

架橋ポリオレフィン層２は被接続体５と接続部材６の
挿入部6aの突合せ部10付近を全周にわたって覆う管状の
構造であり、その長手方向の一端部側の被接続体５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、第１図ではその内部に電熱線４が埋設され、第２図
ではその外表面に、また第３図では内表面に埋設されて
いる。The cross-linked polyolefin layer 2 has a tubular structure that covers the connected body 5 and the vicinity of the butted portion 10 of the insertion portion 6a of the connecting member 6 over the entire circumference, and has a portion corresponding to the connected body 5 on one end side in the longitudinal direction thereof. The non-crosslinked polyolefin layer 3 is laminated on the inner circumference, and the heating wire 4 is embedded in the inside in FIG. 1, the outer surface in FIG. 2 and the inner surface in FIG.

接続部材６は金属管からなり、挿入部6aの反対側の突
出部6bには接続部としてのねじ部11が形成され、中間部
には六角形のスパナ掛け12が形成されている。変性ポリ
オレフィン層７は接続部材６の挿入部6aと架橋ポリオレ
フィン層２間の全周にわたって介在し両者を接着してい
る。The connecting member 6 is made of a metal tube, a threaded portion 11 as a connecting portion is formed on the protruding portion 6b on the opposite side of the insertion portion 6a, and a hexagonal spanner hook 12 is formed in the middle portion. The modified polyolefin layer 7 is interposed between the insertion portion 6a of the connecting member 6 and the crosslinked polyolefin layer 2 and adheres the both.

被接続体支持部９は、非架橋ポリオレフィン層３との
間に被接続体挿入溝８を形成するように、接続部材６の
挿入部6aから一体的に伸びている。The connected body support portion 9 integrally extends from the insertion portion 6a of the connecting member 6 so as to form the connected body insertion groove 8 with the non-crosslinked polyolefin layer 3.

上記のエレクトロフュージョン継手１は、内部、外表
面または内表面に電熱線４を埋設または巻き付けた非架
橋ポリオレフィン層３と、外表面に変性ポリオレフィン
層７をコーティングした接続部材６の挿入部6aおよび被
接続体支持部９とを射出成形型内にインサートした状態
で、ポリオレフィン中に架橋剤、架橋助剤等を含む架橋
性ポリオレフィンを射出して積層一体化した後、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 electrofusion joint 1 comprises a non-crosslinked polyolefin layer 3 in which a heating wire 4 is embedded or wound on the inside, the outer surface or the inner surface, and an insertion portion 6a of a connecting member 6 coated with a modified polyolefin layer 7 on the outer surface and a covered portion. With the connector support portion 9 inserted in the injection mold, a crosslinkable polyolefin containing a crosslinking agent, a crosslinking aid, etc. is injected into the polyolefin to laminate and integrate the layers, and then the crosslinkable polyolefin layer is crosslinked. It is manufactured by forming the 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、導管ヘッダーのノズル等の接続端末に接続部材６の
突出部6bのねじ部11をねじ込んで接続する。そしてポリ
オレフィンチューブ等の被接続体５を被接続体挿入溝８
に挿入して接続部材６の挿入部6aに突合せ、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
続体５に融着して一体化する。Electrofusion joint 1 thus manufactured
Is connected by screwing the threaded portion 11 of the protrusion 6b of the connection member 6 into a connection terminal such as a nozzle of the conduit header. Then, the connected body 5 such as a polyolefin tube is inserted into the connected body insertion groove 8
When the heating wire 4 is energized with the insertion portion 6a of the connection member 6 abutted against the insertion portion 6a, the non-crosslinked polyolefin layer 3 is melted and fused and integrated with the connected body 5.

融着に際しては、熱可塑性樹脂よりなる被接続体５
は、非架橋ポリオレフィン層３の溶融に伴い軟化する
か、被接続体支持部９により被接続体５の内面が支持さ
れているため変形することがない。したがって被接続体
５の流路は狭くなることはなく、接続前とほぼ同等の流
路を維持することが可能である。When fusing, the connected body 5 made of a thermoplastic resin is used.
Does not deform as the non-crosslinked polyolefin layer 3 melts, or does not deform because the inner surface of the connected body 5 is supported by the connected body supporting portion 9. Therefore, the flow path of the connected body 5 does not become narrow, and it is possible to maintain a flow path almost equal to that before the connection.

また上記のエレクトロフュージョン継手１は、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
湯管等の接続に用いても形状保持性に優れる。一方架橋
ポリオレフィン層２が接続部材６および非架橋ポリオレ
フィン層３と一体化した状態で、非架橋ポリオレフィン
層３が被接続体５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。Further, in the above electrofusion joint 1, since the tubular crosslinked polyolefin layer 2 bears the heat resistance strength, the shape retention is excellent even when used for connecting a hot water supply pipe or the like. On the other hand, in the state where the crosslinked polyolefin layer 2 is integrated with the connection member 6 and the non-crosslinked polyolefin layer 3, the noncrosslinked polyolefin layer 3 is fused and integrated with the connected body 5, so that the sealing property is excellent and the hot water supply pipe is used. Even if it is used, the sealing property is maintained for a long time.

第４図は他の実施例を示す断面図である。この実施例
では被接続体支持部９は架橋ポリオレフィンにより、架
橋ポリオレフィン層２と一体的に形成されており、前記
実施例と同様の作用効果を有する。FIG. 4 is a sectional view showing another embodiment. In this embodiment, the support 9 for the body to be connected is formed integrally with the crosslinked polyolefin layer 2 by the crosslinked polyolefin, and has the same effect as that of the above embodiment.

第５図はさらに別の実施例を示す断面図である。この
実施例では、被接続体支持部９は非架橋ポリオレフィン
により、非架橋ポリオレフィン層３と一体的に形成され
ている。FIG. 5 is a sectional view showing still another embodiment. In this embodiment, the connected body supporting portion 9 is made of non-crosslinked polyolefin and is integrally formed with the non-crosslinked polyolefin layer 3.

なお、上記実施例では、被接続体支持部９は接続部材
６または架橋ポリオレフィン層２と同一の材質により一
体化に形成したが、他の材質例えば非架橋ポリオレフィ
ンあるいは金属等からなるものを固着してもよい。また
接着性材料層として変性ポリオレフィン層７を別に形成
したが、変性ポリオレフィンは架橋ポリオレフィン層２
中に分散させてもよい。さらに架橋ポリオレフィン層
２、非架橋ポリオレフィン層３、被接続体支持部９等の
形状、構造などは図示のものに限定されず、変更可能で
ある。電熱線４を非架橋ポリオレフィン層３の外表面ま
たは内表面に設ける場合には、非架橋ポリオレフィン層
３または被接続体５に巻き付けてもよい。In addition, in the above-mentioned embodiment, the connected body supporting portion 9 is integrally formed of the same material as the connecting member 6 or the crosslinked polyolefin layer 2, but another material such as non-crosslinked polyolefin or metal is fixed. May be. Although the modified polyolefin layer 7 was separately formed as the adhesive material layer, the modified polyolefin was the crosslinked polyolefin layer 2
It may be dispersed therein. Further, the shape, structure, etc. of the crosslinked polyolefin layer 2, the non-crosslinked polyolefin layer 3, the connected body supporting portion 9, etc. are not limited to those shown in the drawing, and can be changed. When the heating wire 4 is provided on the outer surface or the inner surface of the non-crosslinked polyolefin layer 3, it may be wound around the non-crosslinked polyolefin layer 3 or the connected body 5.

〔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接続部材およ
び非架橋熱可塑性樹脂層を一体化し、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たの
で、耐熱強度等の高温性能およびシール性に優れ、かつ
被接続体の変形を防止できるとともに、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, the connecting member and the non-crosslinked thermoplastic resin layer are integrated with the crosslinked thermoplastic resin layer, and the heating wire is provided on the inside, the outer surface, or the inner surface of the noncrosslinked thermoplastic resin layer. It is possible to obtain an electrofusion joint excellent in high temperature performance and sealing property, capable of preventing deformation of a connected body, and excellent in workability such as mounting work.

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

第１図ないし第５図は別の実施例の断面図である。 各図中、同一符号は同一または相当部分を示し、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は被接続体、６は接続部材、７は変性ポリ
オレフィン層、８は被接続体挿入溝、９は被接続体支持
部である。1 to 5 are sectional views of another embodiment. In each figure, the same reference numerals indicate the same or corresponding parts, 2 is a crosslinked polyolefin layer, 3 is a non-crosslinked polyolefin layer, 4
Is a heating wire, 5 is an object to be connected, 6 is a connecting member, 7 is a modified polyolefin layer, 8 is an insertion groove for the object to be connected, and 9 is a supporting portion for the object to be connected.

───────────────────────────────────────────────────── 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 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Akio Nakashiba 4-1-2, Hirano-cho, Chuo-ku, Osaka-shi, Osaka, Osaka Gas Co., Ltd. (72) Fumio Hase 6 Waki, Waki-cho, Kaku-gun, Yamaguchi Prefecture Chome 1-2 Mitsui Petrochemical Co., Ltd. (72) Inventor Kazunori Mito 6 1-2 Waki, Waki-cho, Kuga-gun, Yamaguchi Prefecture Mitsui Petrochemical Co., Ltd. (72) Inventor Toshio Shiabuchi Osaka Prefecture Shinwa Sangyo Co., Ltd. 2-10-16 Minamikagaya, Suminoe-ku, Osaka (72) Inventor Mikio Nakaoka 2-10-16 Minamikagaya, Suminoe-ku, Osaka-shi, Osaka

Claims (3)

(57)【特許請求の範囲】(57) [Claims] 【請求項１】架橋熱可塑性樹脂層と、この架橋熱可塑性
樹脂層の一端部側の内側の被接続体に接する位置に、架
橋熱可塑性樹脂層と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
樹脂層の他端部側の内側に挿入して固着された接続部材
と、前記非架橋熱可塑性樹脂層の内側に被接続体挿入溝
を形成するように設けられた被接続体支持部とを有する
接続部材付エレクトロフュージョン継手。1. A non-crosslinked thermoplastic resin formed integrally with the crosslinked thermoplastic resin layer at a position in contact with the crosslinked thermoplastic resin layer and an inside connected body on one end side of the crosslinked thermoplastic resin layer. Layer and the inner, outer surface of the non-crosslinked thermoplastic resin layer,
Alternatively, a heating wire provided on the inner surface, a connection member inserted and fixed inside the other end side of the crosslinked thermoplastic resin layer, and a connection target insertion groove inside the non-crosslinked thermoplastic resin layer An electrofusion joint with a connecting member, which has a connected body supporting portion provided so as to form a joint. 【請求項２】架橋熱可塑性樹脂層は変性熱可塑性樹脂に
より接続部材に接着された請求項（１）記載の接続部材
付エレクトロフュージョン継手。2. The electrofusion joint with a connecting member according to claim 1, wherein the crosslinked thermoplastic resin layer is adhered to the connecting member by a modified thermoplastic resin. 【請求項３】被接続体支持部は接続部材または架橋熱可
塑性樹脂層と一体的に形成された請求項（１）または
（２）記載の接続部材付エレクトロフュージョン継手。3. The electrofusion joint with a connecting member according to claim 1, wherein the connected body supporting portion is integrally formed with the connecting member or the crosslinked thermoplastic resin layer.
JP1072332A 1989-01-11 1989-03-24 Electrofusion fitting with connecting member Expired - Lifetime JP2536618B2 (en)

Priority Applications (13)

Application Number Priority Date Filing Date Title
JP1072332A JP2536618B2 (en) 1989-03-24 1989-03-24 Electrofusion fitting with connecting member
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
DE69032332T DE69032332T2 (en) 1989-01-11 1990-01-11 Electric welding connection and its use in a hot water distributor
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
AT93118038T ATE166442T1 (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
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.
AT90300307T ATE123860T1 (en) 1989-01-11 1990-01-11 ELECTROWELDING JOINT AND USE THEREOF IN A HOT WATER DISTRIBUTOR.
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
JP1072332A JP2536618B2 (en) 1989-03-24 1989-03-24 Electrofusion fitting with connecting member

Publications (2)

Publication Number Publication Date
JPH02253090A JPH02253090A (en) 1990-10-11
JP2536618B2 true JP2536618B2 (en) 1996-09-18

Family

ID=13486230

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1072332A Expired - Lifetime JP2536618B2 (en) 1989-01-11 1989-03-24 Electrofusion fitting with connecting member

Country Status (1)

Country Link
JP (1) JP2536618B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2677113B2 (en) * 1992-05-19 1997-11-17 三井石油化学工業株式会社 Electrofusion fittings

Also Published As

Publication number Publication date
JPH02253090A (en) 1990-10-11

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