JP2704990B2 - Electrofusion fittings - Google Patents
Electrofusion fittingsInfo
- Publication number
- JP2704990B2 JP2704990B2 JP1072333A JP7233389A JP2704990B2 JP 2704990 B2 JP2704990 B2 JP 2704990B2 JP 1072333 A JP1072333 A JP 1072333A JP 7233389 A JP7233389 A JP 7233389A JP 2704990 B2 JP2704990 B2 JP 2704990B2
- Authority
- JP
- Japan
- Prior art keywords
- thermoplastic resin
- crosslinked
- layer
- resin layer
- joined
- 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
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
- B29C66/5221—Joining tubular articles for forming coaxial connections, i.e. the tubular articles to be joined forming a zero angle relative to each other
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
- B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
- B29C66/52—Joining tubular articles, bars or profiled elements
- B29C66/522—Joining tubular articles
- B29C66/5229—Joining tubular articles involving the use of a socket
- B29C66/52291—Joining tubular articles involving the use of a socket said socket comprising a stop
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
- B29C65/3472—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
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: TECHNICAL FIELD The present invention relates to an electrofusion joint for joining an object to be joined such as a polyolefin pipe, particularly a conduit for hot water.
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.
また一般のエレクトロフュージョン継手では、被接合
体が薄肉の樹脂パイプである場合、接合部が熱により変
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。In addition, in a general electrofusion joint, when the object to be joined is a thin resin pipe, there is a problem that a joint portion is deformed by heat and swells inward, thereby narrowing an internal flow path.
本発明の目的は、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、しかも被
接合体の変形を防止でき、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。SUMMARY OF THE INVENTION An object of the present invention is to provide an electrofusion joint that enhances heat resistance by using a crosslinked thermoplastic resin, enhances sealing performance by fusion, prevents deformation of an object to be joined, and has good workability. It is.
本発明は次のエレクトロフュージョン継手である。 The present invention is the following electrofusion joint.
（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、 前記非架橋熱可塑性樹脂層の内側に被接合体を挿入し
て接合するように設けられた被接合体挿入溝と、 この被接合体挿入溝に挿入された被接合体の内面を支
持し、加熱時における被接合体の変形を防止するように
設けられた被接合体支持層と を有するエレクトロフュージョン継手。(1) A joint for connecting an object to be connected made of a thermoplastic resin in a surface layer or the whole, wherein a cross-linked thermoplastic resin layer forming a joint main body and an object to be joined inside the cross-linked thermoplastic resin layer are provided. A non-crosslinked thermoplastic resin layer integrally formed with the crosslinked thermoplastic resin layer at a position in contact with the heating wire provided on the inside, outer surface, or inner surface of the noncrosslinked thermoplastic resin layer; When the object to be joined is inserted into the crosslinked thermoplastic resin layer and is provided so as to be joined, and the inner surface of the object to be joined inserted into the object to be joined is supported, An electrofusion joint comprising: a member to be bonded;
（２）架橋熱可塑性樹脂層は継手本体の端部側に被接合
体近接部を有し、非架橋熱可塑性樹脂層が端部側に露出
するのを防止している上記（１）記載のエレクトロフュ
ージョン継手。(2) The cross-linked thermoplastic resin layer according to the above (1), wherein the joint body has a portion close to an object to be joined at an end side of the joint body and prevents the non-cross-linked thermoplastic resin layer from being exposed to the end side. Electrofusion fitting.
（３）被接合体支持層が架橋熱可塑性樹脂または非架橋
熱可塑性樹脂により形成されている上記（１）または
（２）記載のエレクトロフュージョン継手。(3) The electrofusion joint according to the above (1) or (2), wherein the object-to-be-supported layer is formed of a crosslinked thermoplastic resin or a non-crosslinked thermoplastic resin.
本発明のエレクトロフュージョン継手においては、架
橋熱可塑性樹脂層と非架橋熱可塑性樹脂層とは隣接して
一体化しているのが好ましい。In the electrofusion joint of the present invention, it is preferable that the crosslinked thermoplastic resin layer and the non-crosslinked thermoplastic resin layer are adjacently integrated.
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。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.
本発明ではこのように継手本体としての架橋熱可塑性
樹脂層と、その内側に形成される非架橋熱可塑性樹脂層
とが一体化した積層体を使用するが、架橋熱可塑性樹脂
層は継手本体の端部側に被接合体近接部を有し、非架橋
熱可塑性樹脂層が端部側に露出するのを防止しているの
が好ましい。In the present invention, a cross-linked thermoplastic resin layer serving as the joint body and a non-cross-linked thermoplastic resin layer formed inside the laminated body are used as a unit, but the cross-linked thermoplastic resin layer is formed of the joint body. It is preferable that a portion to be joined is provided on the end side to prevent the non-crosslinked thermoplastic resin layer from being exposed on the end side.
被接合体支持層は架橋熱可塑性樹脂により架橋熱可塑
性樹脂層と一体的に形成するのが望ましいが、被接合体
の変形を防止できるかぎり、非架橋熱可塑性樹脂その他
の材質により形成してもよい。It is desirable that the joined body support layer is formed integrally with the crosslinked thermoplastic resin layer by a crosslinked thermoplastic resin, but as long as deformation of the joined body can be prevented, the joined body support layer may be formed of a non-crosslinked thermoplastic resin or another material. Good.
被接合体挿入溝は熱可塑性樹脂層の内側に被接合体を
挿入してエレクトロフュージョンにより接合できるよう
に形成する。この被接合体挿入溝は２個の被接合体を接
続する場合はエレクトロフュージョン継手の両端部に開
口するように形成するが、被接合体が１個の場合は一端
部のみに形成することができる。The article insertion groove is formed so that the article can be inserted into the thermoplastic resin layer and joined by electrofusion. This joint groove is formed so as to open at both ends of the electrofusion joint when two joints are connected, but may be formed only at one end when there is only one joint. it can.
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 a non-crosslinkable polyolefin which is generally used as a thermoplastic resin.
本発明に係わる熱可塑性樹脂としてはポリオレフィン
が好ましく、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。Polyolefin is preferable as the thermoplastic resin according to the present invention, and the polyolefin has 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.
本発明のエレクトロフュージョン継手は、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、あるいは非架橋熱可塑性樹脂層表面に巻き付けて
射出成形型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。被接合体支持層は架橋熱可塑性樹脂層を形
成する架橋性熱可塑性樹脂と一体的に形成しておくこと
ができる。The electrofusion joint of the present invention, the inside of the non-crosslinked thermoplastic resin layer, the outer surface, or embedded in the heating wire on the inner surface, or in the state of being wound around the non-crosslinked thermoplastic resin layer surface and inserted into the injection mold, After the crosslinkable thermoplastic resin is injected and laminated and integrated, the crosslinkable thermoplastic resin layer is crosslinked to form a crosslinked thermoplastic resin layer. The joined object support layer can be formed integrally with the crosslinkable thermoplastic resin 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、
その一端または両端に開口する被接合体挿入溝に、接合
しようとする熱可塑性樹脂チューブ等の被接合体の端部
を挿入して、熱可塑性樹脂層としての非架橋熱可塑性樹
脂層が被接合体と接し、かつ被接合体支持層で支持され
るように取付け、電熱線に通電すると、熱可塑性樹脂層
としての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。この融着に際して、熱可塑性樹脂チュ
ーブ等の被接合体は非架橋熱可塑性樹脂層の溶融に伴い
軟化するが、被接合体支持層により被接合体の内面が支
持されているため変形することがない。架橋熱可塑性樹
脂層が端部側に被接合体近接部を有する場合は、非架橋
熱可塑性樹脂層が端部側に露出しないため、非架橋熱可
塑性樹脂が軟化したときに端部から流出してシール性が
低下するのが防止される。The electrofusion joint thus manufactured is
Insert the end of the article to be joined, such as a thermoplastic resin tube, into the article insertion groove opened at one end or both ends thereof, and the non-crosslinked thermoplastic resin layer as the thermoplastic resin layer is joined. When it is attached so as to be in contact with the body and supported by the support layer of the object to be joined and the heating wire is energized, the non-crosslinked thermoplastic resin layer as the thermoplastic resin layer melts and is integrally fused to the object to be joined. . At the time of this fusion, a bonded body such as a thermoplastic resin tube is softened with melting of the non-crosslinked thermoplastic resin layer, but may be deformed because the bonded body supporting layer supports the inner surface of the bonded body. Absent. When the cross-linked thermoplastic resin layer has an object-adjacent portion on the end side, the non-cross-linked thermoplastic resin layer is not exposed on the end side, so it flows out from the end when the non-cross-linked thermoplastic resin is softened. As a result, a decrease in sealing performance is prevented.
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。このような被接合体同士を接合する場合は両端に被
接合体挿入溝を有する継手を使用し、このような被接合
体と他の接合部材を接合する場合は一端に被接合体挿入
溝を有する継手を使用する。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. When joining such joined objects, use joints having joined object insertion grooves at both ends, and when joining such joined objects and other joining members, attach joined object insertion grooves at one end. Use joints that have
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、第２図、第３図は別の実施例のエレクトロフ
ュージョン継手の断面図であり、架橋熱可塑性樹脂層と
非架橋熱可塑性樹脂層体からなる例を示す。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、非架橋ポリオレフィン層３の内側に被接合体挿入溝
７を形成するように設けられた被接合体支持層８とを有
する。非架橋ポリオレフィン層３、電熱線４、被接合体
挿入溝７および被接合体支持層８はエレクトロフュージ
ョン継手１の両端部側に設けられている。FIG. 1, FIG. 2, and FIG. 3 are cross-sectional views of an electrofusion joint according to another embodiment, showing an example composed of a crosslinked thermoplastic resin layer and a non-crosslinked thermoplastic resin layer body. In the figure, reference numeral 1 denotes an electrofusion joint, which is a tubular cross-linked polyolefin layer 2 forming a joint main body, and which is integrated with the cross-linked polyolefin layer 2 at a position in contact with the objects 5 and 6 inside the cross-linked polyolefin layer 2. The formed non-crosslinked polyolefin layer 3 and a heating wire 4 provided on the inside, outer surface or inner surface of the non-crosslinked polyolefin layer 3
And an object supporting layer 8 provided so as to form an object insertion groove 7 inside the non-crosslinked polyolefin layer 3. The non-crosslinked polyolefin layer 3, the heating wire 4, the article insertion groove 7, and the article support layer 8 are provided on both ends of the electrofusion joint 1.
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、表層を融着性の熱可塑性樹脂で被覆し
たものを用いる。The members to be joined 5 and 6 are each formed of a tube having a thermoplastic resin layer such as polyethylene, and may be entirely formed of a fusible thermoplastic resin. One coated with a fusible thermoplastic resin is used.
架橋ポリオレフィン層２は被接合体５、６の接合部
（突合せ部）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、第
１図ではその中に電熱線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。継
手１の両端部側の架橋ポリオレフィン層２には、被接合
体５、６に近接する被接合体近接部９が形成されてお
り、これにより非架橋ポリオレフィン層３が端部側に露
出するのを防止している。The crosslinked polyolefin layer 2 has a tubular structure that covers the entire periphery of the joints (butting portions) of the joined bodies 5 and 6, and has an inner periphery of a portion corresponding to each of the joined bodies 5 and 6 on both sides in the longitudinal direction. A heating wire 4 is buried in the non-crosslinked polyolefin layer 3 in FIG. 1, and the heating wire 4 is buried in the outer surface in FIG. 2 and on the inner surface in FIG. In the cross-linked polyolefin layer 2 at both ends of the joint 1, a bonded object proximity portion 9 which is close to the bonded objects 5, 6 is formed, whereby the non-cross-linked polyolefin layer 3 is exposed to the end side. Has been prevented.
被接合体支持層８は、架橋ポリオレフィンからなり、
非架橋ポリオレフィン層３との間に被接合体挿入溝７を
形成するように、架橋ポリオレフィン層２の中央部から
一体的に伸びている。The bonded object support layer 8 is made of a crosslinked polyolefin,
It extends integrally from the central part of the crosslinked polyolefin layer 2 so as to form the article insertion groove 7 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、非架橋ポリ
オレフィン層３中に電熱線４を埋設または巻き付けて射
出成形型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-mentioned electrofusion joint 1 injects a cross-linkable polyolefin containing a cross-linking agent, a cross-linking aid and the like into the polyolefin in a state where the heating wire 4 is embedded or wound in the non-cross-linked polyolefin layer 3 and inserted into an injection mold. After lamination and integration, the crosslinkable polyolefin layer is crosslinked 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、両端部の被接合体挿入溝７にポリオレフィンチュー
ブ等の被接合体５、６の端部を挿入して、非架橋ポリオ
レフィン層３が被接合体５、６と接し、かつ被接合体支
持層８で支持されるように取付ける。この状態で電熱線
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の表層部に融着して一体化し、被接合体
５、６は接続される。Electrofusion joint 1 thus manufactured
Is to insert the ends of the objects 5 and 6 such as polyolefin tubes into the object insertion grooves 7 at both ends so that the non-crosslinked polyolefin layer 3 is in contact with the objects 5 and 6 and the object is supported. Attach as supported by layer 8. When the heating wire 4 is energized in this state, the non-crosslinked polyolefin layer 3 is melted, fused and integrated with the surface layer portions of the joined bodies 5 and 6, and the joined bodies 5 and 6 are connected.
融着に際しては、熱可塑性樹脂よりなる被接合体５、
６は非架橋ポリオレフィン層３の溶融に伴い軟化する
が、被接合体支持層８により被接合体５、６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
合体５、６の流路は狭くなることはなく、接合前とほぼ
同等の流路を維持することが可能である。また架橋熱可
塑性樹脂層２が端部側に被接合体近接部９を有するの
で、非架橋熱可塑性樹脂層３が端部側に露出せず、この
ため非架橋熱可塑性樹脂層３が軟化したときに端部から
流出してシール性が低下するのが防止される。At the time of fusion, the joined body 5 made of a thermoplastic resin,
6 softens with the melting of the non-crosslinked polyolefin layer 3, but does not deform since the inner surfaces of the joined bodies 5 and 6 are supported by the joined body support layer 8. Therefore, the flow paths of the objects 5 and 6 are not narrowed, and it is possible to maintain a flow path substantially equal to that before the bonding. In addition, since the crosslinked thermoplastic resin layer 2 has the article-adjacent portion 9 on the end side, the non-crosslinked thermoplastic resin layer 3 was not exposed on the end side, and thus the non-crosslinked thermoplastic resin layer 3 was softened. It is prevented that it sometimes flows out from the end and the sealing performance is deteriorated.
また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。Further, in the above-mentioned electrofusion joint 1, since the tubular crosslinked polyolefin layer 2 forming the joint main body bears heat resistance, 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.
第４図は他に実施例の断面図である。この実施例で
は、被接合体支持層８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と一体に形成されている。被
接合体５、６が比較的変形しにくい場合には、このよう
な非架橋熱可塑性樹脂からなる被接合体支持層３によっ
て支持することにより被接合体５、６の変形を防止する
ことができる。FIG. 4 is a sectional view of another embodiment. In this embodiment, the object supporting layer 8 is made of a non-crosslinked polyolefin,
It is formed integrally with the non-crosslinked polyolefin layer 3. When the bonded objects 5 and 6 are relatively hard to deform, the deformation of the bonded objects 5 and 6 can be prevented by supporting the bonded object support layer 3 made of such a non-crosslinked thermoplastic resin. it can.
なお、架橋ポリオレフィン層２、非架橋ポリオレフィ
ン層３、被接合体支持層８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。また電熱線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または被接合体
５、６に巻き付けてもよい。The shape, structure, and the like of the crosslinked polyolefin layer 2, the non-crosslinked polyolefin layer 3, the object-to-be-supported support layer 8, and the like are not limited to those shown in the drawings 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, the heating wire 4 may be wound around the non-crosslinked polyolefin layer 3 or the objects 5 and 6.
また上記実施例は熱可塑性樹脂層を有する被接合体同士
の接続の例を示したが、このような被接合体と他の接続
部材を接続する場合は一端部に被接合体挿入溝を有する
継手を用いる。Further, the above-described embodiment shows an example of connection between objects to be joined having a thermoplastic resin layer. However, when such an object to be joined is connected to another connecting member, an object-to-be-joined insertion groove is provided at one end. Use joints.
本発明によれば、架橋熱可塑性樹脂層に一体化した非
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、非架橋熱可塑性樹脂層の内側に被接合体挿入
溝および被接合体支持層を設けたので、被接合体が薄肉
の場合でも、加熱時に被接合体部が熱により変形して内
側に膨らみ、内部の流路が狭くなるのを防止でき、これ
により、耐熱強度等の高温性能およびシール性に優れ、
かつ被接合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, a heating wire is provided on the inside, the outer surface or the inner surface of the non-crosslinked thermoplastic resin layer integrated with the crosslinked thermoplastic resin layer, the bonded object insertion groove and the inside of the non-crosslinked thermoplastic resin layer and Since the joined body support layer is provided, even when the joined body is thin, the joined body portion is deformed by heat and swells inward during heating, and it is possible to prevent the internal flow path from being narrowed. Excellent high temperature performance such as heat resistance and sealing properties,
In addition, it is possible to obtain an electrofusion joint that can prevent deformation of a member to be joined and is excellent in workability such as mounting work.
第１図ないし第４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、６は被接合体、７は被接合体挿入溝、８
は被接合体支持層、９は被接合体近接部である。1 to 4 are cross-sectional views of another embodiment. In the drawings, the same reference numerals indicate the same or corresponding portions, 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, 7 is a groove for inserting an object, 8
Is a support layer for the object to be bonded, and 9 is a portion near the object to be bonded.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 西村 寛之 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 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 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hiroyuki Nishimura 4-1-2, Hirano-cho, Chuo-ku, Osaka-shi, Osaka Inside Osaka Gas Co., Ltd. (72) Inventor Akio Nakashiba 4 Hirano-cho, Chuo-ku, Osaka-shi, Osaka 1-2 1-2, Osaka Gas Co., Ltd. (72) Inventor Fumio Hase 6-1-2, Waki-machi, Waka-cho, Kuga-gun, Yamaguchi Prefecture Inside Mitsui Petrochemical Industry Co., Ltd. 6-1-2 Kimachi Waki Mitsui Petrochemical Industry Co., Ltd. (72) Inventor Toshio Shibuchi 2-10-16 Minamikagaya, Suminoe-ku, Osaka-shi, Osaka Shinwa Sangyo Co., Ltd. (72) Inventor Nakaoka Mikio 2-10-16 Minamikagaya, Suminoe-ku, Osaka City, Osaka Shinwa Sangyo Co., Ltd.
Claims (3)
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、 前記非架橋熱可塑性樹脂層の内側に被接合体を挿入して
接合するように設けられた被接合体挿入溝と、 この被接合体挿入溝に挿入された被接合体の内面を支持
し、加熱時における被接合体の変形を防止するように設
けられた被接合体支持層と 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 crosslinked thermoplastic resin layer forming a joint main body and a joined object inside the crosslinked thermoplastic resin layer are provided. At a position in contact with the body, a non-crosslinked thermoplastic resin layer formed integrally with the crosslinked thermoplastic resin layer, and a heating wire provided on the inner, outer surface, or inner surface of the non-crosslinked thermoplastic resin layer, A bonded object insertion groove provided to insert and bond the bonded object inside the non-crosslinked thermoplastic resin layer, and supports an inner surface of the bonded object inserted in the bonded object insertion groove, An electrofusion joint comprising: a member-to-be-bonded supporting layer provided to prevent deformation of the member-to-be-bonded during heating.
被接合体近接部を有し、非架橋熱可塑性樹脂層が端部側
に露出するのを防止している請求項１記載のエレクトロ
フュージョン継手。2. The cross-linked thermoplastic resin layer has a portion close to the article to be joined on the end side of the joint body to prevent the non-cross-linked thermoplastic resin layer from being exposed on the end side. Electrofusion fittings.
非架橋熱可塑性樹脂により形成されている請求項１また
は２記載のエレクトロフュージョン継手。3. The electrofusion joint according to claim 1, wherein the object supporting layer is formed of a cross-linked thermoplastic resin or a non-cross-linked thermoplastic resin.
Priority Applications (13)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1072333A JP2704990B2 (en) | 1989-03-24 | 1989-03-24 | 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. |
| EP93118038A EP0585974B1 (en) | 1989-01-11 | 1990-01-11 | Electrofusion joint and hot water supply header using the same |
| AT90300307T ATE123860T1 (en) | 1989-01-11 | 1990-01-11 | ELECTROWELDING JOINT AND USE THEREOF IN A HOT WATER DISTRIBUTOR. |
| AT93118038T ATE166442T1 (en) | 1989-01-11 | 1990-01-11 | ELECTROWELDING JOINT AND USE THEREOF 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 |
| DE69019998T DE69019998T2 (en) | 1989-01-11 | 1990-01-11 | Electric welding connection and its use 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 |
|---|---|---|---|
| JP1072333A JP2704990B2 (en) | 1989-03-24 | 1989-03-24 | Electrofusion fittings |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8319363A Division JP2935421B2 (en) | 1996-11-29 | 1996-11-29 | Electrofusion fittings |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02253091A JPH02253091A (en) | 1990-10-11 |
| JP2704990B2 true JP2704990B2 (en) | 1998-01-26 |
Family
ID=13486259
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1072333A Expired - Lifetime JP2704990B2 (en) | 1989-01-11 | 1989-03-24 | Electrofusion fittings |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2704990B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH061988U (en) * | 1992-06-16 | 1994-01-14 | 増雄 邱 | Joint |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2606487B1 (en) * | 1986-11-07 | 1989-03-10 | Silix | POLYOLEFINIC RESIN TUBES FOR THE PRODUCTION OF PIPES, SLEEVES FOR THEIR ASSEMBLY AND METHOD FOR THEIR MANUFACTURE |
-
1989
- 1989-03-24 JP JP1072333A patent/JP2704990B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02253091A (en) | 1990-10-11 |
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