JP2005090595A - Electric fusion joint, and method for manufacturing the same - Google Patents

Electric fusion joint, and method for manufacturing the same Download PDF

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Publication number
JP2005090595A
JP2005090595A JP2003323497A JP2003323497A JP2005090595A JP 2005090595 A JP2005090595 A JP 2005090595A JP 2003323497 A JP2003323497 A JP 2003323497A JP 2003323497 A JP2003323497 A JP 2003323497A JP 2005090595 A JP2005090595 A JP 2005090595A
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Prior art keywords
joint
barrier layer
ethylene
vinyl alcohol
alcohol copolymer
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JP2003323497A
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Japanese (ja)
Inventor
Tomoyuki Nemoto
友幸 根本
Keisuke Asakura
啓介 朝倉
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Mitsubishi Plastics Inc
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Mitsubishi Plastics Inc
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Priority to JP2003323497A priority Critical patent/JP2005090595A/en
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    • 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
    • B29C66/128—Stepped joint cross-sections
    • B29C66/1282—Stepped joint cross-sections comprising at least one overlap joint-segment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/128—Stepped joint cross-sections
    • B29C66/1284—Stepped joint cross-sections comprising at least one butt joint-segment
    • B29C66/12841—Stepped joint cross-sections comprising at least one butt joint-segment comprising at least two butt joint-segments
    • 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
    • B29C66/52292—Joining tubular articles involving the use of a socket said socket comprising a stop said stop being internal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/723—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered
    • B29C66/7234—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered comprising a barrier layer
    • 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
    • B29C66/976—Checking completion of joining or correct joining by using indications on at least one of the joined parts by the use of an indicator pin, e.g. being integral with one of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D23/00—Producing tubular articles
    • B29D23/001—Pipes; Pipe joints
    • B29D23/003—Pipe joints, e.g. straight joints
    • B29D23/005—Pipe joints, e.g. straight joints provided with electrical wiring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/3468—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the means for supplying heat to said heated elements which remain in the join, e.g. special electrical connectors of windings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/3472—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
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2023/00—Tubular articles
    • B29L2023/22—Tubes or pipes, i.e. rigid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/24—Pipe joints or couplings

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric fusion joint, and a method for manufacturing the same, in which a multiple layer tube comprising a barrier layer of ethylene-vinyl alcohol copolymer provided on the outer circumference of a tube main body part comprising polyethylene resin can be easily connected by similar work to general polyethylene tube for water or gas lines. <P>SOLUTION: This electric fusion joint 11 is for connecting the multiple layer tube comprising a barrier layer comprising ethylene-vinyl alcohol copolymer provided on the outer circumference of the tube main body part of polyethylene resin through an adhesive layer. On the inner circumference of a joint main body part 12 comprising polyethylene resin, a barrier layer 14 comprising ethylene-vinyl alcohol copolymer is provided through the adhesive layer 13. In an outer circumferential part of the barrier layer, an electric heat line 15 is wound to fuse resin at an outer circumferential surface at an end part of the multiple layer tube and resin in an inner circumferential surface of a receiving port of the electric fusion joint, so that they are jointed with each other. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、電気融着継手及びその製造方法に関し、詳しくは、ガソリンに対するバリア性を付加するために外周にエチレン−ビニルアルコール共重合体からなるバリア層を設けた多層管を接続するための電気融着継手及びその製造方法に関する。   The present invention relates to an electric fusion joint and a method for manufacturing the same, and more specifically, to connect an electric pipe for connecting a multilayer pipe having a barrier layer made of an ethylene-vinyl alcohol copolymer on its outer periphery in order to add a barrier property to gasoline. The present invention relates to a fusion joint and a manufacturing method thereof.

ガソリン輸送用に用いる合成樹脂管として、ポリアミドとエチレン−ビニルアルコール共重合体とからなる多層管が提案されている（例えば、特許文献１参照。）。このガソリン輸送用多層管は、自動車のタンクとエンジンとを接続するための配管材料として用いることを主な目的としている。したがって、多層管同士の接続に対してはほとんど考慮されていない。
特開２００３−２１２７６号公報 As a synthetic resin pipe used for gasoline transportation, a multilayer pipe made of polyamide and an ethylene-vinyl alcohol copolymer has been proposed (for example, see Patent Document 1). The multilayer pipe for transporting gasoline is mainly used as a piping material for connecting an automobile tank and an engine. Therefore, little consideration is given to the connection between the multilayer tubes.
JP 2003-21276 A

しかし、ガソリンスタンドでのガソリン輸送に使用する配管の場合は、配管の屈曲部や分岐部等で配管同士を接続する必要があり、この接続部には、接続作業が容易で、かつ、確実な接続状態が得られる管継手を使用する必要がある。例えば、水道管やガス管等に多用されているポリエチレン管を接続するための電気融着継手のような管継手を用いることが望ましい。   However, in the case of pipes used for gasoline transportation at a gas station, it is necessary to connect the pipes at the bent or branched parts of the pipes. It is necessary to use a pipe joint that can be connected. For example, it is desirable to use a pipe joint such as an electric fusion joint for connecting a polyethylene pipe often used for a water pipe or a gas pipe.

一方、ポリエチレン管に耐ガソリン性を付与するため、ポリエチレン管の外周に、耐ガソリン性に優れたエチレン−ビニルアルコール共重合体からなるフィルムを巻き付けたり、あるいは、ポリエチレン樹脂によって形成した管本体部の外周にエチレン−ビニルアルコール共重合体からなるバリア層を一体に押出成形することが行われつつある。   On the other hand, in order to impart gasoline resistance to the polyethylene pipe, a film made of an ethylene-vinyl alcohol copolymer having excellent gasoline resistance is wrapped around the outer circumference of the polyethylene pipe, or a pipe main body formed of polyethylene resin. A barrier layer made of an ethylene-vinyl alcohol copolymer is being integrally extruded on the outer periphery.

そこで本発明は、ポリエチレン樹脂からなる管本体部の外周にエチレン−ビニルアルコール共重合体からなるバリア層を設けた多層管を、一般の水道用やガス用のポリエチレン管と同様の作業で簡単に接続することができる電気融着継手及びその製造方法を提供することを目的としている。   Therefore, the present invention provides a multilayer pipe with a barrier layer made of an ethylene-vinyl alcohol copolymer on the outer periphery of a pipe body made of polyethylene resin. It is an object of the present invention to provide an electric fusion joint that can be connected and a method for manufacturing the same.

上記目的を達成するため、本発明の電気融着継手は、ポリエチレン樹脂からなる管本体部の外周に、接着剤層を介してエチレン−ビニルアルコール共重合体からなるバリア層を設けた多層管を接続するための電気融着継手であって、ポリエチレン樹脂からなる継手本体部の内周に、接着剤層を介してエチレン−ビニルアルコール共重合体からなるバリア層を設けるとともに、該バリア層の外周部分に、前記多層管の端部外周面の樹脂及び該電気融着継手の受口内周面の樹脂をそれぞれ溶融させて接合するための電熱線を巻回したことを特徴としている。   In order to achieve the above object, an electrofusion joint of the present invention comprises a multilayer pipe in which a barrier layer made of an ethylene-vinyl alcohol copolymer is provided on the outer periphery of a pipe body made of polyethylene resin via an adhesive layer. An electric fusion joint for connection, wherein a barrier layer made of an ethylene-vinyl alcohol copolymer is provided on an inner periphery of a joint body portion made of polyethylene resin via an adhesive layer, and an outer periphery of the barrier layer A heating wire for melting and joining the resin on the outer peripheral surface of the end portion of the multilayer tube and the resin on the inner peripheral surface of the electro-fusion joint is wound around the portion.

また、本発明の電気融着継手の製造方法は、エチレン−ビニルアルコール共重合体を射出成形して電気融着継手内周側のバリア層となるボビンを成形する工程と、成形後のボビン（バリア層）の外周面に電熱線を巻回する工程と、電熱線巻回後のボビン（バリア層）の外周に接着剤層を形成する工程と、該接着剤層の外周にポリエチレン樹脂を射出成形して継手本体部を成形する工程とを含むことを特徴としている。   In addition, the method for producing an electrofusion joint of the present invention includes a step of injection-molding an ethylene-vinyl alcohol copolymer to form a bobbin serving as a barrier layer on the inner peripheral side of the electrofusion joint, and a bobbin ( A step of winding a heating wire on the outer peripheral surface of the barrier layer), a step of forming an adhesive layer on the outer periphery of the bobbin (barrier layer) after the heating wire is wound, and a polyethylene resin is injected on the outer periphery of the adhesive layer And a step of forming a joint main body by molding.

本発明の電気融着継手によれば、外周にエチレン−ビニルアルコール共重合体からなる耐ガソリン性に優れたバリア層を設けた多層管を容易に接続することができる。   According to the electric fusion joint of the present invention, it is possible to easily connect a multilayer pipe provided with a barrier layer made of an ethylene-vinyl alcohol copolymer and having excellent gasoline resistance on the outer periphery.

図は本発明の一形態例を示すもので、図１は電気融着継手の製造工程を説明するための各工程ごとの断面正面図、図２は本発明の電気融着継手で接続する多層管の一例を示す断面側面図、図３及び図４は施工時の状態を示すもので、図３は電気融着継手の受口に多層管を挿入する前の状態を示す要部の断面正面図、図４は電気融着継手の受口に多層管の端部を挿入した状態を示す要部の断面正面図である。   FIG. 1 shows an embodiment of the present invention. FIG. 1 is a cross-sectional front view for explaining each process of manufacturing an electrofusion joint, and FIG. 2 is a multilayer connected by the electrofusion joint of the present invention. FIG. 3 and FIG. 4 show the state at the time of construction, and FIG. 3 is a sectional front view of the main part showing the state before the multilayer pipe is inserted into the receptacle of the electrofusion joint. FIG. 4 is a cross-sectional front view of the main part showing a state in which the end of the multilayer tube is inserted into the receptacle of the electrofusion joint.

本形態例に示す電気融着継手１１は、図１（Ｄ）に示すように、ポリエチレン樹脂からなる継手本体部１２の内周に、接着剤層１３を介してエチレン−ビニルアルコール共重合体からなるバリア層１４を設けるとともに、該バリア層１４の外周部分に電熱線１５を巻回したものである。   As shown in FIG. 1 (D), the electrofusion joint 11 shown in this embodiment is formed from an ethylene-vinyl alcohol copolymer via an adhesive layer 13 on the inner periphery of a joint body 12 made of polyethylene resin. And a heating wire 15 is wound around the outer peripheral portion of the barrier layer 14.

電気融着継手１１の基本的な構造や形状等は、水道用やガス用のポリエチレン樹脂製電気融着継手と同じものとすることができ、接続対象となるパイプ（多層管）のサイズに応じた内径を有していればよい。電熱線１５も従来から用いられている電熱線を用いることができる。バリア層１４の厚みは、電気融着継手１１のサイズに依存するが、例えば、サイズが１００の場合は、内径が約１１４ｍｍで、使用する電熱線１５の線径が０．５〜１．０ｍｍであるから、バリア層１４の厚みは１．０〜２．０ｍｍが適当である。   The basic structure, shape, etc. of the electric fusion joint 11 can be the same as those of a polyethylene resin electric fusion joint for water and gas, depending on the size of the pipe (multilayer pipe) to be connected. It is only necessary to have an inner diameter. As the heating wire 15, a conventionally used heating wire can also be used. The thickness of the barrier layer 14 depends on the size of the electrofusion joint 11. For example, when the size is 100, the inner diameter is about 114 mm and the wire diameter of the heating wire 15 used is 0.5 to 1.0 mm. Therefore, the thickness of the barrier layer 14 is suitably 1.0 to 2.0 mm.

この電気融着継手１１の製造は、まず、図１（Ａ）に示すように、エチレン−ビニルアルコール共重合体を射出成形して電気融着継手内周側のバリア層１４となるボビンを成形する。次に、図１（Ｂ）に示すように、ボビン（バリア層１４）の外周面に電熱線１５を巻回する。次に、図１（Ｃ）に示すように、電熱線１５を巻回したボビン（バリア層１４）の外周に接着剤層を形成する。この接着剤層１３の形成は、射出成形によって行うこともでき、接着性樹脂フィルムを外周に巻回することによって行うこともできる。   As shown in FIG. 1A, first, the electrofusion joint 11 is manufactured by injection-molding an ethylene-vinyl alcohol copolymer to form a bobbin that becomes the barrier layer 14 on the inner periphery side of the electrofusion joint. To do. Next, as shown in FIG. 1B, a heating wire 15 is wound around the outer peripheral surface of the bobbin (barrier layer 14). Next, as shown in FIG. 1C, an adhesive layer is formed on the outer periphery of the bobbin (barrier layer 14) around which the heating wire 15 is wound. Formation of this adhesive layer 13 can also be performed by injection molding, and can also be performed by winding an adhesive resin film on the outer periphery.

最後に、ポリエチレン樹脂を射出成形することにより、接着剤層１３の外周に継手本体部１２を成形する。この継手本体部１２の射出成形と同時に、電熱線１５の両端部がコネクター１６にそれぞれ接続され、該コネクター１６の近傍にインジケータピン１７がそれぞれ形成され、図１（Ｄ）に示す形状の電気融着継手１１が成形される。   Finally, the joint body 12 is formed on the outer periphery of the adhesive layer 13 by injection molding of polyethylene resin. Simultaneously with the injection molding of the joint body 12, both ends of the heating wire 15 are respectively connected to the connectors 16, and indicator pins 17 are formed in the vicinity of the connectors 16, respectively. The fitting 11 is formed.

一方、図２に示すように、前記電気融着継手１１の接続対象となる多層管２１は、内側から順に、ポリエチレン樹脂からなる管本体部２２、接着剤層２３、エチレン−ビニルアルコール共重合体からなるバリア層２４、接着剤層２５、ポリエチレン樹脂からなる被覆層２６を積層した５層構造を有している。多層管２１の全体的な寸法は、水道用やガス用のポリエチレン樹脂製パイプと同様に設定することができ、例えば、サイズが１００の場合は、外径を１１４ｍｍ、肉厚を１０ｍｍに設定すればよい。   On the other hand, as shown in FIG. 2, the multilayer pipe 21 to be connected to the electrofusion joint 11 includes a pipe body 22 made of polyethylene resin, an adhesive layer 23, and an ethylene-vinyl alcohol copolymer in order from the inside. It has a five-layer structure in which a barrier layer 24 made of, an adhesive layer 25, and a coating layer 26 made of polyethylene resin are laminated. The overall dimensions of the multilayer pipe 21 can be set in the same way as for polyethylene resin pipes for water and gas. For example, when the size is 100, the outer diameter is set to 114 mm and the wall thickness is set to 10 mm. That's fine.

バリア層２４の厚みは、バリア性、特に耐ガソリン性が十分に得られる厚みであればよく、通常は、１００〜３００μｍとすればよい。接着剤層２３，２５は、ポリエチレン樹脂とエチレン−ビニルアルコール共重合体とを接着できればよく、任意の接着剤を使用することが可能であり、例えば、無水マレイン酸とグラフトポリオレフィンとからなる接着性樹脂を用いることができる。接着剤層２３，２５の厚みは、１００μｍ程度で十分である。被覆層２６は、バリア層２４を湿気から保護するものであり、厚みは湿気を遮断でき、耐傷付き性や耐摩耗性等を考慮しても、１００μｍ程度でよい。   The thickness of the barrier layer 24 may be a thickness that provides sufficient barrier properties, particularly gasoline resistance, and is usually 100 to 300 μm. The adhesive layers 23 and 25 may be any adhesive as long as it can bond a polyethylene resin and an ethylene-vinyl alcohol copolymer. For example, an adhesive composed of maleic anhydride and a grafted polyolefin. Resin can be used. A thickness of about 100 μm is sufficient for the adhesive layers 23 and 25. The coating layer 26 protects the barrier layer 24 from moisture, and the thickness can block moisture, and may be about 100 μm even in consideration of scratch resistance, wear resistance, and the like.

また、電気融着継手１１と接続する際のスクレープ作業によって被覆層２６及び接着剤層２５とを除去することができるように、両者の合計の厚みが０．２ｍｍ以下となるように、両者の厚みを設定しておく。さらに、電気融着継手１１の継手本体部１２や被覆層２６に、耐ガソリン性パイプであることを示す着色を施しておくこともできる。   Further, in order that the coating layer 26 and the adhesive layer 25 can be removed by a scraping operation when connecting to the electrofusion joint 11, both of them are made to have a total thickness of 0.2 mm or less. Set the thickness. Furthermore, the joint main body 12 and the coating layer 26 of the electrofusion joint 11 can be colored to indicate that it is a gasoline-resistant pipe.

継手本体部１２や管本体部２２、被覆層２６を構成するポリエチレン樹脂は、通常の水道用やガス用のポリエチレン管等に用いられているポリエチレン樹脂と同じもの、例えば高密度ポリエチレンを使用することができる。   The polyethylene resin constituting the joint main body 12, the pipe main body 22, and the coating layer 26 is the same as the polyethylene resin used for ordinary water pipes and gas polyethylene pipes, for example, high-density polyethylene. Can do.

バリア層１４，２４を構成するエチレン−ビニルアルコール共重合体は、エチレン−ビニルアルコール共重合体又はエチレン−ビニルアルコール共重合体を主体とした混合物であって、エチレン−ビニルアルコール共重合体としては、エチレン含有量が３５〜７０モル％で、ケン化度が９５モル％以上のものを使用することができる。エチレン含有量が３５モル％未満では成形性に問題が発生することがあり、７０モル％を超えると、成形性は向上するがバリア性が低下して所望の耐ガソリン性が得られなくなる。また、ケン化度が９５モル％未満でもバリア性が低下するため好ましくない。   The ethylene-vinyl alcohol copolymer constituting the barrier layers 14, 24 is an ethylene-vinyl alcohol copolymer or a mixture mainly composed of an ethylene-vinyl alcohol copolymer. Further, those having an ethylene content of 35 to 70 mol% and a saponification degree of 95 mol% or more can be used. If the ethylene content is less than 35 mol%, a problem may occur in the moldability. If the ethylene content exceeds 70 mol%, the moldability is improved, but the barrier property is lowered and the desired gasoline resistance cannot be obtained. Moreover, even if the degree of saponification is less than 95 mol%, the barrier property is lowered, which is not preferable.

また、バリア層１４，２４は、多層管接続時に電熱線１５の発熱によって溶融し、融着接合する部分となるので、両者の合計の厚みが１ｍｍ未満になると接合力が低下するおそれがあって好ましくない、逆に、バリア層１４，２４を２ｍｍを超える厚みにしてもバリア性は向上しない。   Moreover, since the barrier layers 14 and 24 are melted by the heat generated by the heating wire 15 when the multi-layer tube is connected and become a part to be fusion bonded, if the total thickness of both becomes less than 1 mm, the bonding force may be reduced. On the contrary, even if the barrier layers 14 and 24 have a thickness exceeding 2 mm, the barrier property is not improved.

電気融着継手１１を用いて多層管２１を接続する際には、まず、図３に示すように、多層管２１の接合面となる部分をスクレープして酸化膜を除去するとともに、内側のバリア層２４を露出させる。このスクレープの際に、バリア層２４を被覆層２６及び接着剤層２５とは異なる色調としておくことにより、表面の色を見ながら最小のスクレープ量でスクレープ作業を終えることができ、作業性の向上も図れる。   When connecting the multilayer pipe 21 using the electric fusion joint 11, first, as shown in FIG. 3, the portion that becomes the joint surface of the multilayer pipe 21 is scraped to remove the oxide film and the inner barrier. Layer 24 is exposed. In this scraping, by setting the barrier layer 24 to a color tone different from that of the coating layer 26 and the adhesive layer 25, the scraping operation can be completed with the minimum amount of scraping while looking at the surface color, and the workability is improved. Can also be planned.

次に、図４に示すように、スクレープ後の多層管２１の端部（接合部）を電気融着継手１１の受口内に挿入し、コネクター１６を電源に接続して電熱線１５に通電し、電熱線１５の周囲の樹脂を溶融させてバリア層１４，２４を熱融着させる。このとき、電熱線１５の外側のポリエチレン樹脂の溶融によってインジケータピン１７が突出する。   Next, as shown in FIG. 4, the end portion (joint portion) of the multilayer pipe 21 after scraping is inserted into the receptacle of the electric fusion joint 11, the connector 16 is connected to the power source, and the heating wire 15 is energized. Then, the resin around the heating wire 15 is melted to heat-seal the barrier layers 14 and 24. At this time, the indicator pin 17 protrudes due to melting of the polyethylene resin outside the heating wire 15.

このようにしてバリア層１４，２４を熱融着させることにより、耐ガソリン性に優れたエチレン−ビニルアルコール共重合体同士が接合した状態となり、エチレン−ビニルアルコール共重合体からなるバリア層が連続した状態になるので、電気融着継手１１で接続した配管全体の耐ガソリン性が損なわれることがない。   By thermally fusing the barrier layers 14 and 24 in this manner, the ethylene-vinyl alcohol copolymer excellent in gasoline resistance is joined to each other, and the barrier layer made of the ethylene-vinyl alcohol copolymer is continuous. Therefore, the gasoline resistance of the entire pipe connected by the electric fusion joint 11 is not impaired.

なお、継手本体部１２等を形成するポリエチレン樹脂やバリア層１４，２４を形成するエチレン−ビニルアルコール共重合体には、従来から用いられている各種添加剤を混合することができる。   In addition, conventionally used various additives can be mixed in the polyethylene resin forming the joint body 12 and the ethylene-vinyl alcohol copolymer forming the barrier layers 14 and 24.

本発明の電気融着継手は、ガソリンスタンド等のガソリン輸送用配管の継手として利用できる。   The electric fusion joint of the present invention can be used as a joint for piping for gasoline transportation such as a gas station.

本発明の一形態例を示すもので、電気融着継手の製造工程を説明するための各工程ごとの断面正面図である。The one example of the present invention is shown, and it is a sectional front view for each process for explaining the manufacturing process of the electrofusion joint. 本発明の電気融着継手で接続する多層管の一例を示す断面側面図である。It is a cross-sectional side view which shows an example of the multilayer pipe | tube connected with the electrofusion joint of this invention. 電気融着継手の受口に多層管を挿入する前の状態を示す要部の断面正面図である。It is a cross-sectional front view of the principal part which shows the state before inserting a multilayer pipe in the receptacle of an electric fusion joint. 電気融着継手の受口に多層管の端部を挿入した状態を示す要部の断面正面図である。It is a cross-sectional front view of the principal part which shows the state which inserted the edge part of the multilayer pipe in the receptacle of the electric fusion joint.

符号の説明Explanation of symbols

１１…電気融着継手、１２…継手本体部、１３…接着剤層、１４…バリア層、１５…電熱線、１６…コネクター、１７…インジケータピン、２１…多層管、２２…管本体部、２３…接着剤層、２４…バリア層、２５…接着剤層、２６…被覆層   DESCRIPTION OF SYMBOLS 11 ... Electric fusion joint, 12 ... Joint main-body part, 13 ... Adhesive layer, 14 ... Barrier layer, 15 ... Heating wire, 16 ... Connector, 17 ... Indicator pin, 21 ... Multi-layer pipe, 22 ... Pipe main-body part, 23 ... Adhesive layer, 24 ... Barrier layer, 25 ... Adhesive layer, 26 ... Coating layer

Claims (2)

ポリエチレン樹脂からなる管本体部の外周に、接着剤層を介してエチレン−ビニルアルコール共重合体からなるバリア層を設けた多層管を接続するための電気融着継手であって、ポリエチレン樹脂からなる継手本体部の内周に、接着剤層を介してエチレン−ビニルアルコール共重合体からなるバリア層を設けるとともに、該バリア層の外周部分に、前記多層管の端部外周面の樹脂及び該電気融着継手の受口内周面の樹脂をそれぞれ溶融させて接合するための電熱線を巻回したことを特徴とする電気融着継手。   An electrofusion joint for connecting a multilayer pipe in which a barrier layer made of an ethylene-vinyl alcohol copolymer is provided on the outer periphery of a pipe body made of polyethylene resin via an adhesive layer, and made of polyethylene resin A barrier layer made of an ethylene-vinyl alcohol copolymer is provided on the inner periphery of the joint body through an adhesive layer, and the outer peripheral portion of the barrier layer is provided with the resin on the outer peripheral surface of the multilayer tube and the electric An electric fusion joint characterized by winding a heating wire for melting and joining the resin on the inner peripheral surface of the receiving joint of the fusion joint. ポリエチレン樹脂からなる管本体部の外周に、接着剤層を介してエチレン−ビニルアルコール共重合体からなるバリア層を設けた多層管を接続するための電気融着継手の製造方法であって、エチレン−ビニルアルコール共重合体を射出成形して電気融着継手内周側のバリア層を成形する工程と、成形後のバリア層の外周面に電熱線を巻回する工程と、電熱線巻回後のバリア層の外周に接着剤層を形成する工程と、該接着剤層の外周にポリエチレン樹脂を射出成形して継手本体部を成形する工程とを含むことを特徴とする電気融着継手の製造方法。   A method for producing an electrofusion joint for connecting a multilayer pipe provided with a barrier layer made of an ethylene-vinyl alcohol copolymer to an outer periphery of a pipe body made of polyethylene resin via an adhesive layer, -A step of forming a barrier layer on the inner peripheral side of the electric fusion joint by injection molding a vinyl alcohol copolymer, a step of winding a heating wire around the outer peripheral surface of the molded barrier layer, and after winding of the heating wire The method includes the steps of: forming an adhesive layer on the outer periphery of the barrier layer; and injection-molding polyethylene resin on the outer periphery of the adhesive layer to form a joint body portion. Method.
JP2003323497A 2003-09-16 2003-09-16 Electric fusion joint, and method for manufacturing the same Pending JP2005090595A (en)

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JP6211153B1 (en) * 2016-08-08 2017-10-11 株式会社森武工務店 Pipe connection structure
EP3763980A1 (en) * 2019-07-12 2021-01-13 Uponor Infra Oy Multilayered pipes and method of producing the same
JP7352339B2 (en) 2018-09-28 2023-09-28 積水化学工業株式会社 Piping structure

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JPH05172289A (en) * 1991-12-26 1993-07-09 Sekisui Chem Co Ltd Electric fusion attach pipe fitting and manufacture thereof
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EP3763980A1 (en) * 2019-07-12 2021-01-13 Uponor Infra Oy Multilayered pipes and method of producing the same

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