JPH08270869A - Electro-fusion joint - Google Patents

Electro-fusion joint

Info

Publication number
JPH08270869A
JPH08270869A JP7074143A JP7414395A JPH08270869A JP H08270869 A JPH08270869 A JP H08270869A JP 7074143 A JP7074143 A JP 7074143A JP 7414395 A JP7414395 A JP 7414395A JP H08270869 A JPH08270869 A JP H08270869A
Authority
JP
Japan
Prior art keywords
resin material
fusion
plastic pipe
joint
pipe
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP7074143A
Other languages
Japanese (ja)
Inventor
Satoru Nagami
哲 永見
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.)
Mitsui Petrochemical Industries Ltd
Original Assignee
Mitsui Petrochemical Industries 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 Mitsui Petrochemical Industries Ltd filed Critical Mitsui Petrochemical Industries Ltd
Priority to JP7074143A priority Critical patent/JPH08270869A/en
Publication of JPH08270869A publication Critical patent/JPH08270869A/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • 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"
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—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

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Branch Pipes, Bends, And The Like (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

PURPOSE: To prevent the long-term pressure resistant performance of a joint after fusion from being impaired by performing the fusion of an electro-fusion joint surely in short time and without producing the deterioration of resin of a fused part. CONSTITUTION: A polyethylene sleeve 3 of 1.5 to 5 times a melt-flow rate polyethylene tube 1 is used at a fusion part with a polyethylene tube 2.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は、プラスチック管による
配管工事において用いられ、プラスチック管との接合面
に電熱線をコイル状に埋設したエレクトロフュージョン
継手に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrofusion joint which is used in a piping work using a plastic pipe and in which a heating wire is embedded in a coil shape on a joint surface with the plastic pipe.

【０００２】[0002]

【従来技術】上下水道管やガス管等の配管工事において
用いられるプラスチック管の継手として近年開発された
ものにエレクトロフュージョン継手がある。この継手に
は、管同志を連結するのに用いるソケット継手、エルボ
継手、チーズ継手、レジューサ継手、枝管を接続するの
に用いるサドル継手、管端部に取着されるキャップ継手
など様々なタイプのものがあり、一般には、管との接合
面に電熱線をコイル状に埋設した成形品よりなってい
る。そして管との融着は、継手の三方、両側若しくは方
側よりプラスチック管を嵌挿後、或いはプラスチック管
の外周面に継手を押し当てたのち、通電によりプラスチ
ック管との接合面を加熱溶融して行っている。2. Description of the Related Art An electrofusion joint has been recently developed as a joint for plastic pipes used in plumbing works such as water and sewer pipes and gas pipes. This joint has various types such as socket joints used for connecting pipes, elbow joints, cheese joints, reducer joints, saddle joints used for connecting branch pipes, cap joints attached to pipe ends. , And generally consists of a molded product in which a heating wire is embedded in a coil shape on the joint surface with the pipe. For fusion with the pipe, after inserting the plastic pipe from three sides, both sides or one side of the joint, or after pressing the joint against the outer peripheral surface of the plastic pipe, heat and melt the joint surface with the plastic pipe by energizing. I am going.

【０００３】上下水道管やガス管等に使用されるプラス
チック管は、長期の耐圧性能が要求されるため、一般に
はポリエチレン等、分子量の大きな材料が用いられ、継
手にも同じ材料が用いられているが、こうした材料は概
して溶融時の流動性がきわめて低い。継手の融着時に
は、使用材料にある程度の流動性が必要であり、必要な
流動性を持たせるために、従来は高い温度で融着を行っ
ていた。Since plastic pipes used for water and sewer pipes, gas pipes, etc. are required to have a long-term pressure resistance performance, a material having a large molecular weight such as polyethylene is generally used, and the same material is used for a joint. However, these materials generally have very low melt flow properties. At the time of fusion bonding of the joint, the material used needs to have a certain degree of fluidity, and in order to have the required fluidity, fusion was conventionally performed at a high temperature.

【０００４】[0004]

【発明が解決しようとする課題】エレクトロフュージョ
ン継手で融着時の温度を上げるには、長い通電時間が必
要であり、融着時の温度が高いと、融着後の冷却時間も
長くなる。また高温での融着は融着部の樹脂の劣化を招
き易い。本発明の第１の目的は、長期の耐圧性能を損な
うことなく、短時間で融着が十分に行えるようなエレク
トロフュージョン継手を提供しようとするものであり、
第２の目的は、従来よりも比較的低温で融着が行われる
ようなエレクトロフュージョン継手を提供しようとする
ものである。In order to raise the temperature at the time of fusion in the electrofusion joint, a long energization time is required, and if the temperature at the time of fusion is high, the cooling time after fusion becomes long. In addition, fusion at a high temperature tends to cause deterioration of the resin at the fused portion. A first object of the present invention is to provide an electrofusion joint capable of sufficiently performing fusion bonding in a short time without impairing long-term pressure resistance performance.
The second object is to provide an electrofusion joint in which fusion is performed at a relatively lower temperature than ever before.

【０００５】[0005]

【課題の解決手段及び作用】第１の目的を達成するため
の発明は、プラスチック管との接合面に電熱線をコイル
状に埋設し、管との融着を通電により行うエレクトロフ
ュージョン継手において、プラスチック管との融着部分
の一部若しくは全体にプラスチック管の樹脂材料よりも
溶融流動性の大きな樹脂材料、すなわちＪＩＳ Ｋ ７
２１０で定めるメルトフローレイト（以下「ＭＦＲ」と
いう）の大きな樹脂材料を用いたことを特徴とする。The invention for achieving the first object is to provide an electrofusion joint in which a heating wire is embedded in a coil shape in a joint surface with a plastic pipe and fusion with the pipe is conducted by energization. A resin material having a larger melt flowability than the resin material of the plastic pipe in a part or the whole of the fused portion with the plastic pipe, that is, JIS K 7
It is characterized by using a resin material having a large melt flow rate (hereinafter referred to as “MFR”) defined by 210.

【０００６】本発明によれば、融着時の溶融樹脂は流動
性がよいため、融着不足を生ずることなく、融着が早
く、かつ確実に行うことができ、接合面の汚れも洗い流
すことができるようになる。また、使用される溶融流動
性の大きな樹脂材料が長期耐圧性能の劣る材料であって
も、融着部にのみ部分的に用いられるだけであるから、
長期耐圧性能が実質的に損なわれることはない。According to the present invention, since the molten resin at the time of fusing has good fluidity, fusing can be performed quickly and reliably without causing insufficient fusing, and stains on the joint surface can be washed away. Will be able to. Further, even if the resin material having a large melt fluidity used is inferior in the long-term pressure resistance performance, it is only partially used for the fused portion,
The long-term pressure resistance performance is not substantially impaired.

【０００７】本発明で用いる溶融流動性の大きな樹脂材
料は、エレクトロフュージョン継手に用いることのでき
る樹脂材料、例えばポリエチレン、ポリプロピレン、ブ
テン─１、４ーメチルベンテン─１などのポリオレフィ
ンで、高ＭＦＲのもの、具体的にはポリエチレンの場
合、ＭＦＲがポリエチレン管の１．５〜５倍程度のもの
である。The resin material having a large melt fluidity used in the present invention is a resin material which can be used in an electrofusion joint, for example, a polyolefin having a high MFR such as polyethylene, polypropylene, butene-1,4-methylbenten-1, and the like. Specifically, in the case of polyethylene, the MFR is about 1.5 to 5 times that of polyethylene pipe.

【０００８】第２の目的を達成するための発明は、プラ
スチック管との接合面に電熱線をコイル状に埋設し、管
との融着を通電により行うエレクトロフュージョン継手
において、プラスチック管との融着部分の一部若しくは
全体にプラスチック管の樹脂材料よりも低融点、すなわ
ち低密度の樹脂材料を用いたことを特徴とする。本発明
によれば、融着が比較的低温で行われるため、融着部の
樹脂の劣化を生じにくい。The invention for achieving the second object is to provide an electrofusion joint in which a heating wire is embedded in a coil shape on a joint surface with a plastic tube and the fusion with the tube is conducted by energization. It is characterized in that a resin material having a melting point lower than that of the resin material of the plastic pipe, that is, a resin material having a low density is used for a part or the whole of the adhered portion. According to the present invention, since fusion is performed at a relatively low temperature, deterioration of the resin in the fused portion is unlikely to occur.

【０００９】本発明で用いる低融点の樹脂材料は、上記
発明と同様、エレクトロフュージョン継手に用いること
のできる樹脂材料、例えばポリエチレン、ポリプロピレ
ン、ブテン─１、４ーメチルベンテン─１などのポリオ
レフィンで、プラスチック管に用いる樹脂材料よりも、
融点が例えば２〜１０℃低いもの、好ましくは上述する
理由から溶融流動性の大きなものが用いられる。The low melting point resin material used in the present invention is a resin material which can be used in an electrofusion joint, for example, a polyolefin such as polyethylene, polypropylene, butene-1,4-methylpentene-1, and the like, as in the above invention. Than the resin material used for
For example, one having a melting point lower by 2 to 10 ° C., preferably one having a large melt fluidity is used for the reason described above.

【００１０】上記各発明の継手、すなわちプラスチック
管との接合部の一部或いは全体にプラスチック管の樹脂
材料よりも大きな溶融流動性及び若しくは低融点の樹脂
材料を用いた継手の製法としては、例えば成形金型のス
ライドコアに被覆材料を上記材料とした被覆電熱線を一
定ピッチで巻付け、これを金型内にセットしたのち射出
成形する方法、上記材料で成形したスリーブに電熱線或
いは上記材料を被覆した被覆電熱線を一定ピッチで巻付
け、これをスライドコアに装着したのち、金型内にセッ
トして射出成形する方法などを例示することができる。Examples of a method for producing the joint of the above invention, that is, a joint using a resin material having a higher melt flowability and / or a lower melting point than the resin material of the plastic pipe in a part or the whole of the joint with the plastic pipe include A method in which a coated heating wire containing the above-mentioned material as a coating material is wound around a slide core of a molding die at a constant pitch, and is set in a mold and then injection-molded. A method may be exemplified in which a coated heating wire coated with is wound at a constant pitch, mounted on a slide core, set in a mold, and injection-molded.

【００１１】[0011]

【実施例】図１に示すエレクトロフュージョン継手１
は、ポリエチレン管２（ＭＦＲ０．２ｇ／１０分）との
融着部にＭＦＲ融点ＭＦＲ０．５ｇ／１０分のポリエチ
レン製スリーブ３を用いてなるもので、スリーブ２に該
スリーブと同じ材料を被覆した被覆電熱線（図示省略）
を一定ピッチで巻付け、これを金型内にセットして上記
ポリエチレン管２と同じ材料のポリエチレンを射出成形
することによって得られるものである。EXAMPLE An electrofusion joint 1 shown in FIG.
Is a polyethylene tube 2 (MFR 0.2 g / 10 min) fused with a polyethylene sleeve 3 having an MFR melting point MFR 0.5 g / 10 min. The sleeve 2 is coated with the same material as the sleeve. Coated heating wire (not shown)
Is wound at a constant pitch, set in a mold, and polyethylene of the same material as the polyethylene pipe 2 is injection-molded.

【００１２】[0012]

【発明の効果】本発明は以上のように構成され、次のよ
うな効果を奏する。プラスチック管との融着部分の一部
若しくは全体にプラスチック管よりも溶融流動製の大き
な樹脂材料を用いたものでは、融着時における融着部分
の流動性がよいため、溶融樹脂が融着域全域に行きわた
り易くなって融着不足を生ずることがなくなり、しかも
高温に加熱しないでも融着を行うことができるうえ、接
合面に付着する汚れを洗い流すことができるから、融着
が確実に、しかも短時間で行えるようになる。また溶融
流動性をよくするための材料が長期耐圧性能に劣る材料
であっても、融着部にのみ部分的に用いられるだけであ
るから、継手全体の長期耐圧性能が実質的に損なわれる
ことはない。The present invention is configured as described above and has the following effects. If a resin material that is larger in melt flow than the plastic pipe is used for part or all of the fusion-bonded portion with the plastic pipe, the melted resin has good fluidity at the time of fusion, so the molten resin It is easy to spread over the whole area and insufficient fusion does not occur.Furthermore, fusion can be performed without heating to a high temperature, and dirt adhering to the joint surface can be washed away, so fusion is ensured. Moreover, it can be done in a short time. Even if the material for improving the melt fluidity is a material with poor long-term pressure resistance, it is only partially used for the fusion-bonded part, so that the long-term pressure resistance of the entire joint is substantially impaired. There is no.

【００１３】プラスチック管との融着部分の一部若しく
は全体にプラスチック管よりも融点の低い樹脂材料を用
いたものでは、比較的低温で融着できるから、融着部の
樹脂の劣化を生じにくい。プラスチック管との融着部分
の一部若しくは全体にプラスチック管よりも溶融流動性
が大きく、かつ融点の低い樹脂材料を用いたものでは、
上記効果を併せて有するようになる。When a resin material having a melting point lower than that of the plastic pipe is used for a part or the whole of the fusion-bonded portion with the plastic pipe, the resin can be fused at a relatively low temperature, and therefore the resin in the fusion-bonded portion is less likely to deteriorate. . With a resin material having a higher melting fluidity and a lower melting point than the plastic pipe for a part or the whole of the fused portion with the plastic pipe,
The above effects are also provided.

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

【図１】 本発明に係るエレクトロフュージョン継手を
用いてプラスチック管を融着するときの断面図。FIG. 1 is a cross-sectional view when a plastic pipe is fused using an electrofusion joint according to the present invention.

【符号の説明】[Explanation of symbols]

１・・エレクトロフュージョン継手 ２・・ポ
リエチレン管 ３・・ポリエチレン製スリーブ1 ・ ・ Electrofusion joint 2 ・ ・ Polyethylene tube 3 ・ ・ Polyethylene sleeve

Claims (5)

【特許請求の範囲】[Claims] 【請求項１】 プラスチック管との接合面に電熱線をコ
イル状に埋設し、管との融着を通電により行うエレクト
ロフュージョン継手において、プラスチック管との融着
部分の一部若しくは全体にプラスチック管の樹脂材料よ
りも溶融流動性の大きな樹脂材料を用いたことを特徴と
するエレクトロフュージョン継手。1. An electrofusion joint in which a heating wire is embedded in a coil shape on a surface to be joined with a plastic pipe and is fused with the pipe by energization, and the plastic pipe is partially or wholly fused to the plastic pipe. An electrofusion joint characterized by using a resin material having a larger melt flowability than that of the above-mentioned resin material. 【請求項２】 樹脂材料がポリエチレンの場合、融着部
分の一部若しくは全体にメルトフローレイトがポリエチ
レン管の１．５〜５倍である樹脂材料が用いられる請求
項１記載のエレクトロフュージョン継手。2. The electrofusion joint according to claim 1, wherein when the resin material is polyethylene, a resin material having a melt flow rate of 1.5 to 5 times that of the polyethylene pipe is used for a part or the whole of the fusion-bonded portion. 【請求項３】 プラスチック管との接合面に電熱線をコ
イル状に埋設し、管との融着を通電により行うエレクト
ロフュージョン継手において、プラスチック管との融着
部分の一部若しくは全体にプラスチック管の樹脂材料よ
りも低融点の樹脂材料を用いたことを特徴とするエレク
トロフュージョン継手。3. An electrofusion joint in which a heating wire is embedded in a coil shape on a joint surface with a plastic pipe and fusion-bonding with the pipe is conducted by energization, and a plastic pipe is partially or wholly fused to the plastic pipe. An electrofusion joint characterized by using a resin material having a melting point lower than that of the above-mentioned resin material. 【請求項４】 融着部分の一部若しくは全体にプラスチ
ック管の樹脂材料よりも融点が２〜１０℃低い樹脂材料
が用いられる請求項３記載のエレクトロフュージョン継
手。4. The electrofusion joint according to claim 3, wherein a resin material having a melting point lower than that of the resin material of the plastic tube by 2 to 10 ° C. is used for a part or the whole of the fused portion. 【請求項５】 融着部分の一部若しくは全体に用いられ
る樹脂材料は、プラスチック管よりも溶融流動性の大き
な樹脂材料である請求項３又は４記載のエレクトロフュ
ージョン継手。5. The electrofusion joint according to claim 3, wherein the resin material used for a part or the whole of the fusion-bonded portion is a resin material having a larger melt fluidity than a plastic pipe.
JP7074143A 1995-03-30 1995-03-30 Electro-fusion joint Pending JPH08270869A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7074143A JPH08270869A (en) 1995-03-30 1995-03-30 Electro-fusion joint

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7074143A JPH08270869A (en) 1995-03-30 1995-03-30 Electro-fusion joint

Publications (1)

Publication Number Publication Date
JPH08270869A true JPH08270869A (en) 1996-10-15

Family

ID=13538665

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7074143A Pending JPH08270869A (en) 1995-03-30 1995-03-30 Electro-fusion joint

Country Status (1)

Country Link
JP (1) JPH08270869A (en)

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