JPH1151280A - Electrofusion joint and manufacture thereof - Google Patents
Electrofusion joint and manufacture thereofInfo
- Publication number
- JPH1151280A JPH1151280A JP9204975A JP20497597A JPH1151280A JP H1151280 A JPH1151280 A JP H1151280A JP 9204975 A JP9204975 A JP 9204975A JP 20497597 A JP20497597 A JP 20497597A JP H1151280 A JPH1151280 A JP H1151280A
- Authority
- JP
- Japan
- Prior art keywords
- diameter
- wire
- heating wire
- joint
- coil
- 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
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
- B29C66/01—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
- 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
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
- B29C65/3472—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the composition of the heated elements which remain in the joint
- B29C65/3476—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the composition of the heated elements which remain in the joint being metallic
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
- B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
- B29C66/52—Joining tubular articles, bars or profiled elements
- B29C66/522—Joining tubular articles
- B29C66/5221—Joining tubular articles for forming coaxial connections, i.e. the tubular articles to be joined forming a zero angle relative to each other
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
- B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
- B29C66/52—Joining tubular articles, bars or profiled elements
- B29C66/522—Joining tubular articles
- B29C66/5229—Joining tubular articles involving the use of a socket
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- 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
- B29C65/348—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 with a polymer coating
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Branch Pipes, Bends, And The Like (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
Description
【0001】[0001]
【発明が属する技術分野】本発明は、プラスチック管に
よる配管工事において、プラスチック管を接続するため
に用いられ、プラスチック管との接合面に電熱線をコイ
ル状に埋設してプラスチック管と電気融着されるエレク
トロフュージョン継手と、その製造法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for connecting plastic pipes in piping work using plastic pipes. A heating wire is buried in a coil shape at a joint surface with the plastic pipe, and the plastic pipe is fused with the plastic pipe. The present invention relates to an electrofusion joint to be used and a manufacturing method thereof.
【0002】[0002]
【従来技術】上下水道管や給湯管或いはガス管等の配管
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おり、一般には金属製のコアに被
覆電熱線を巻付けるか、或いは樹脂製のボビンに電熱線
を巻付けたのちコアに嵌挿し、ついで金型に装着して射
出形成することにより得られるが、この成形品には樹脂
の後収縮によりサイズが経時変化して小さくなる(これ
を以下、「縮径」と称する)傾向が見られる。2. Description of the Related Art Electrofusion joints have recently been developed as joints for plastic pipes used in plumbing works such as water and sewage pipes, hot water supply pipes and gas pipes. This joint consists of a molded product in which a heating wire is embedded in a coil shape on the joint surface with the pipe. Generally, a coated heating wire is wound around a metal core, or a heating wire is wound around a resin bobbin. It is then obtained by inserting it into a core, then mounting it in a mold and injection molding. The size of this molded product changes with time due to post-shrinkage of the resin, and becomes smaller (hereinafter referred to as “diameter reduction”). ).
【0003】一方、プラスチック管は一般に押し出し成
形によって得られるが、射出成形のように高圧、高剪断
速度で成形されないために内部歪が小さく、後収縮は極
く小さいか、殆ど見られない。[0003] On the other hand, plastic pipes are generally obtained by extrusion molding. However, since they are not molded at high pressure and high shearing speed unlike injection molding, internal strain is small and post-shrinkage is extremely small or hardly observed.
【0004】[0004]
【発明が解決しようとする課題】射出成形によって得ら
れたエレクトロフュージョン継手は、上述するように経
時によって縮径するため成形後しばらくは寸法サイズが
JIS規格を満足していても長期間経過すると、規格値
を外れ、プラスチック管が挿入できなくなるトラブルが
発生する。As described above, the electrofusion joint obtained by injection molding shrinks in diameter with time as described above. If the value is out of the specified range, a trouble that the plastic tube cannot be inserted occurs.
【0005】本発明は、長期間経過しても規格値を満足
し、プラスチック管を挿入できなくなるといったトラブ
ルを生ずることがないエレクトロフュージョン継手と、
その製造法を提供することを目的とする。[0005] The present invention provides an electrofusion joint which satisfies the standard value even after a long period of time and does not cause troubles such as inability to insert a plastic tube.
It is intended to provide a manufacturing method thereof.
【0006】[0006]
【課題の解決手段】本発明者らは、種々の実験の結果、
長期間に亘ってJIS規格を満足することのできるエレ
クトロフュージョン継手には、コイル状に埋設される電
熱線のコイル径と電熱線の線径との間に相関関係があ
り、電熱線の材質の如何にかゝわらず、限界線径以上の
線径を有する電熱線を選べば長期に亘ってJIS規格を
満足することができるエレクトロフュージョン継手が得
られることを見出した。Means for Solving the Problems The present inventors have obtained various experiments,
In an electrofusion joint that can satisfy the JIS standard for a long period of time, there is a correlation between the coil diameter of a heating wire embedded in a coil and the wire diameter of the heating wire. Regardless, it has been found that if a heating wire having a wire diameter larger than the critical wire diameter is selected, an electrofusion joint that can satisfy the JIS standard for a long period of time can be obtained.
【0007】本発明は、この知見に基づいてなされたも
ので、図1に示すエレクトロフュージョン継手1におい
て、継手にコイル状に埋設される電熱線2のコイル径D
と、電熱線2の線径dの比D/dを145以下、好まし
くは120以下としたことを特徴とし、その製造法は、
継手にコイル状に埋設される電熱線のコイル径Dと電熱
線の線径dの比D/dが145以下、好ましくは120
以下となるような電熱線を用いたことを特徴とする。The present invention has been made based on this finding, and in the electrofusion joint 1 shown in FIG. 1, the coil diameter D of the heating wire 2 embedded in the joint in a coil shape.
And the ratio D / d of the wire diameter d of the heating wire 2 is 145 or less, preferably 120 or less.
The ratio D / d of the coil diameter D of the heating wire and the wire diameter d of the heating wire embedded in the coil in the joint is 145 or less, preferably 120
It is characterized by using a heating wire as described below.
【0008】D/dが145以下になる電熱線を用いた
ことにより、縮径によるプラスチック管の挿入トラブル
をほゞ解消することができる。下限は本来限定する必要
はないが、電熱線の線径dを大きくすればする程、電熱
線の剛性が増すため、巻き線が困難になるうえ、高価格
となる。こうした点を考慮すると、電熱線の線径を余り
に大きくすることは得策でなく、上述するD/dの下限
は好ましくは80以上、より好ましくは90以上とされ
る。By using a heating wire having a D / d of 145 or less, it is possible to substantially eliminate the trouble of inserting a plastic tube due to a reduction in diameter. The lower limit does not need to be limited, but as the wire diameter d of the heating wire increases, the rigidity of the heating wire increases, so that the winding becomes difficult and the cost increases. Considering these points, it is not advisable to make the diameter of the heating wire too large, and the lower limit of D / d is preferably 80 or more, more preferably 90 or more.
【0009】[0009]
実施例1 電熱線に、線径が0.55mmψ、材質がクロムニッケル
合金(以下、「CN合金」という)よりなるワイヤーの
被覆電熱線(線径1.65mmψ)を用い、呼び径50の
図1に示すエレクトロフュージョン継手を射出成形によ
り複数個製作した。このときのコイル状に埋設された被
覆電熱線の中心でのコイル径Dとワイヤーの線径dの比
D/dは113であり、得られた継手のワイヤーのコイ
ル径を成形直後と1年後、2年後及び3年後においてそ
れぞれ測定し、その平均値と最小値を求めたところ、い
づれも以下の表1に示されるようにJIS規格の規格値
60.5±0.20mmを満足していた。Example 1 A heating wire having a wire diameter of 0.55 mmψ and a material coated with a chromium-nickel alloy (hereinafter referred to as “CN alloy”) coated wire (diameter 1.65 mmψ) and having a nominal diameter of 50 was used. A plurality of electrofusion joints shown in No. 1 were produced by injection molding. At this time, the ratio D / d of the coil diameter D at the center of the coated heating wire embedded in the coil to the wire diameter d of the wire was 113, and the coil diameter of the wire of the obtained joint was determined to be one year between immediately after molding and one year. After 2 years and 3 years later, the average value and the minimum value were obtained, and all satisfied the JIS standard value of 60.5 ± 0.20 mm as shown in Table 1 below. Was.
【0010】実施例2 ワイヤーを線径0.65mmψのCN合金とした被覆電熱
線(線径1.95mmψ)を用い、呼び径75のエレクト
ロフュージョン継手を複数個、射出成形により成形し
た。このときのD/dは141であり、得られた継手の
ワイヤーのコイル径を成形直後と1年後においてそれぞ
れ測定し、その平均値と最小値を求めたところ、いづれ
も表1に示されるようにJIS規格の規格値89.7±
0.20mmを満足した。Example 2 A plurality of electrofusion joints having a nominal diameter of 75 were formed by injection molding using a coated heating wire (wire diameter: 1.95 mm) made of a CN alloy having a wire diameter of 0.65 mm #. The D / d at this time was 141, and the coil diameter of the wire of the obtained joint was measured immediately after molding and one year later, and the average value and the minimum value were obtained. JIS standard value 89.7 ±
0.20 mm was satisfied.
【0011】実施例3 ワイヤーの線径を0.85mmψとする以外は実施例1と
同様の被覆電熱線(線径2.55mmψ)を用い、呼び径
75のエレクトロフュージョン継手を複数個、射出成形
により成形した。このときのD/dは109であり、得
られた継手のワイヤーのコイル径を成形直後と、1年
後、2年後及び3年後においてそれぞれ測定し、その平
均値と最小値を求めたところ、いづれも以下の表1に示
されるように、JIS規格の規格値89.7±0.20
mmを満足した。Example 3 Injection molding of a plurality of electrofusion joints having a nominal diameter of 75 was performed using the same coated heating wire (wire diameter of 2.55 mm) as in Example 1 except that the wire diameter was 0.85 mm5. Molded by D / d at this time was 109, and the coil diameter of the wire of the obtained joint was measured immediately after molding, and after one year, two years, and three years, respectively, and the average value and the minimum value were obtained. However, as shown in Table 1 below, all of the JIS standard values are 89.7 ± 0.20.
mm was satisfied.
【0012】実施例4 ワイヤーを線径0.85mmψのCN合金とした被覆電熱
線(線径2.55mmψ)を用い、呼び径100のエレク
トロフュージョン継手を複数個、射出成形により成形し
た。このときのD/dは138であり、得られた継手の
ワイヤーのコイル径を成形直後と1年後及び2年後にお
いてそれぞれ測定し、その平均値と最小値を求めたとこ
ろ、いづれも以下の表1に示されるように、JIS規格
の規格値114.85±0.25mmを満足した。Example 4 A plurality of electrofusion joints having a nominal diameter of 100 were formed by injection molding using a coated heating wire (wire diameter 2.55 mmψ) made of a CN alloy having a wire diameter of 0.85 mmψ. The D / d at this time was 138. The coil diameter of the wire of the obtained joint was measured immediately after molding, one year and two years later, and the average value and the minimum value were obtained. As shown in Table 1 below, the JIS standard value of 114.85 ± 0.25 mm was satisfied.
【0013】実験例5 ワイヤーを線径1.20mmψのCN合金とした被覆電熱
線(線径3.60mmψ)を用い、呼び径100のエレク
トロフュージョン継手を複数個、射出成形により成形し
た。このときのD/dは99であり、得られた継手のワ
イヤーのコイル径を成形直後と、1年後、2年後及び3
年後においてそれぞれ測定し、その平均値と最小値を求
めたところ、いづれも以下の表1に示されるように、J
IS規格の規格値114.85±0.25mmを満足し
た。Experimental Example 5 A plurality of electrofusion joints having a nominal diameter of 100 were formed by injection molding using a coated heating wire (wire diameter: 3.60 mm) made of a CN alloy having a wire diameter of 1.20 mm1.2. The D / d at this time was 99, and the coil diameter of the wire of the obtained joint was measured immediately after molding, one year later, two years later, and 3 days later.
After each year, the average value and the minimum value were determined, and as shown in Table 1 below, J
The value satisfies the IS standard value of 114.85 ± 0.25 mm.
【0014】実験例6 ワイヤーを線径1.35mmψのCN合金とした被覆電熱
線(線径4.05mmψ)を用い、呼び径150のエレク
トロフュージョン継手を複数個、射出成形により成形し
た。このときのD/dは126であり、得られた継手の
ワイヤーのコイル径を成形直後と1年後においてそれぞ
れ測定し、その平均値と最小値を求めたところ、いづれ
も表1に示されるようにJIS規格の規格値166.1
±30mmを満足した。Experimental Example 6 A plurality of electrofusion joints having a nominal diameter of 150 were formed by injection molding using a coated heating wire (wire diameter of 4.05 mm) made of a CN alloy having a wire diameter of 1.35 mm #. The D / d at this time was 126. The coil diameter of the wire of the obtained joint was measured immediately after molding and one year later, and the average value and the minimum value were obtained. JIS standard value 166.1
± 30 mm was satisfied.
【0015】実施例7 ワイヤーを線径1.45mmψのニッケルクロム合金(以
下、「NCH合金」という)の被覆電熱線(線径4.3
5mmψ)を用い、呼び径150のエレクトロフュージョ
ン継手を複数個、射出成形により成形した。このときの
D/dは117であり、得られた継手の内径を成形直後
と1年後においてそれぞれ測定し、その平均値と最小値
を求めたところ、いづれも以下の表1に示されるように
JIS規格の規格値166.1±30mmを満足した。EXAMPLE 7 A wire was coated with a nickel-chrome alloy (hereinafter referred to as "NCH alloy") having a wire diameter of 1.45 mmψ (wire diameter: 4.3).
Using 5 mmψ), a plurality of electrofusion joints having a nominal diameter of 150 were formed by injection molding. The D / d at this time was 117, and the inner diameter of the obtained joint was measured immediately after molding and one year later, and the average value and the minimum value were obtained. Both were as shown in Table 1 below. Satisfies the JIS standard value of 166.1 ± 30 mm.
【0016】比較例1 ワイヤーを線径0.36mmψのクロム鉄合金(以下、
「FCH合金」という)の被覆電熱線(線径1.08mm
ψ)を用い、呼び径50のエレクトロフュージョン継手
を複数個、射出成形により成形した。このときのD/d
は171であり、得られた継手のワイヤーのコイル径を
成形直後と1年後、2年後及び3年後においてそれぞれ
測定し、その平均値と最小値を求めたところ、以下の表
1に示されるように、成形直後ではJIS規格の規格値
60.5±0.20mmを満足していたが、1年以上経過
したものは全てJIS規格の規格値を満たさなかった。Comparative Example 1 A wire was made of a chromium iron alloy having a wire diameter of 0.36 mm
“FCH alloy” coated heating wire (wire diameter 1.08mm)
Using ψ), a plurality of electrofusion joints having a nominal diameter of 50 were formed by injection molding. D / d at this time
Is 171. The coil diameter of the wire of the obtained joint was measured immediately after molding, 1 year, 2 years, and 3 years later, and the average value and the minimum value were obtained. As shown in the figure, immediately after molding, the JIS standard value of 60.5 ± 0.20 mm was satisfied, but all of the samples after one year or more did not satisfy the JIS standard value.
【0017】比較例2 ワイヤーの線径を0.40mmψとする以外は比較例1と
同様の被覆電熱線(線径1.20mmψ)を用い、比較例
1と同じ呼び径のエレクトロフュージョン継手を複数個
得た。このときのD/dは154であり、得られた継手
のワイヤーのコイル径を成形直後と1年後、2年後及び
3年後においてそれぞれ測定し、その平均値と最小値を
求めたところ、以下の表1に示されるように、成形直後
ではJIS規格の規格値60.5±0.20mmを満足し
ていたが、1年を経過したものゝ中にはJIS規格の規
格値を満たさないものが生じ、2年以上経過したものは
全てJIS規格の規格値を満たさなかった。Comparative Example 2 The same coated heating wire (wire diameter: 1.20 mmψ) as in Comparative Example 1 was used except that the wire diameter was changed to 0.40 mmψ, and a plurality of electrofusion joints having the same nominal diameter as Comparative Example 1 were used. I got one. D / d at this time was 154, and the coil diameter of the wire of the obtained joint was measured immediately after molding, 1 year, 2 years, and 3 years later, and the average value and the minimum value were obtained. As shown in Table 1 below, immediately after molding, the JIS standard value of 60.5 ± 0.20 mm was satisfied, but after one year, the JIS standard value was not satisfied. Some of them did not meet the JIS standard values after 2 years.
【0018】比較例3 ワイヤーを線径0.65mmψのCN合金とした被覆電熱
線(線径1.95mmψ)を用い、比較例3と同じ呼び径
のエレクトロフュージョン継手を複数個得た。このとき
のD/dは166であり、得られた継手のワイヤーのコ
イル径を成形直後と1年後、2年後及び3年後において
それぞれ測定し、その平均値と最小値を求めたところ、
以下の表1に示されるように、成形直後ではJIS規格
の規格値60.1±0.20mmを満足していたが、1年
を経過したものゝ中にはJIS規格の規格値を満たさな
いものが生じ、2年以上経過したものは全てJIS規格
の規格値を満たさなかった。Comparative Example 3 A plurality of electrofusion joints having the same nominal diameter as Comparative Example 3 were obtained using a coated heating wire (wire diameter: 1.95 mmψ) made of a CN alloy having a wire diameter of 0.65 mmψ. D / d at this time was 166, and the coil diameter of the wire of the obtained joint was measured immediately after molding, one year, two years, and three years later, and the average value and the minimum value were obtained. ,
As shown in Table 1 below, immediately after molding, the JIS standard value of 60.1 ± 0.20 mm was satisfied, but after one year, it did not satisfy the JIS standard value during one year. All of the samples that had passed two years or more did not meet the JIS standard values.
【0019】比較例4 ワイヤーを線径0.65mmψのCN合金とした被覆電熱
線(線径1.95mmψ)を用い、呼び径100のエレク
トロフュージョン継手を射出成形により得た。このとき
のD/dは180であり、得られた継手のワイヤーのコ
イル径を成形直後と1年後、2年後及び3年後において
それぞれ測定し、その平均値と最小値を求めたところ、
以下の表1に示されるように、成形直後ではJIS規格
の規格値114.85±0.25mmを満足していたが、
1年を経過したものゝ中にはJIS規格の規格値を満た
さないものが生じ、2年以上経過したものは全てJIS
規格の規格値を満たさなかった。 比較例5 ワイヤーを線径1.10mmψのCN合金とした被覆電熱
線(線径3.30mmψ)を用い、呼び径150のエレク
トロフュージョン継手を射出成形により得た。このとき
のD/dは154であり、得られた継手のワイヤーのコ
イル径を成形直後と1年後、2年後及び3年後において
それぞれ測定し、その平均値と最小値を求めたところ、
以下の表1に示されるように、成形直後ではJIS規格
の規格値166.1±0.30mmを満足していたが、1
年を経過したものゝ中にはJIS規格の規格値を満たさ
ないものが生じた。Comparative Example 4 An electrofusion joint having a nominal diameter of 100 was obtained by injection molding using a coated heating wire (wire diameter: 1.95 mmψ) made of a CN alloy having a wire diameter of 0.65 mmψ. D / d at this time was 180, and the coil diameter of the wire of the obtained joint was measured immediately after molding, one year, two years, and three years later, and the average value and the minimum value were obtained. ,
As shown in Table 1 below, immediately after molding, the JIS standard value of 114.85 ± 0.25 mm was satisfied.
One that has passed one year, some do not satisfy the JIS standard values, and all that have passed two years or more
The standard value was not met. Comparative Example 5 An electrofusion joint having a nominal diameter of 150 was obtained by injection molding using a coated heating wire made of a CN alloy having a wire diameter of 1.10 mmψ (wire diameter of 3.30 mmψ). D / d at this time was 154, and the coil diameter of the wire of the obtained joint was measured immediately after molding, 1 year, 2 years, and 3 years later, and the average value and the minimum value were obtained. ,
As shown in Table 1 below, immediately after molding, the product satisfied the JIS standard value of 166.1 ± 0.30 mm.
Some of the aged ones did not meet the JIS standard values.
【0020】エレクトロフュージョン継手は通常1年以
内に使用されるところから、1年経過してもJIS規格
の規格値を満足する上記各実施例品は適格品とされ、こ
とに3年間保管された後でも規格値を満足する実施例
1、3及び5の製品は全く問題がないと考えられる。Since the electrofusion joint is usually used within one year, each of the above-mentioned examples satisfying the JIS standard values even after one year has been qualified, and has been stored for three years in particular. It is considered that the products of Examples 1, 3 and 5 satisfying the standard value even afterwards have no problem at all.
【0021】[0021]
【表1】 ここで内径の上段はコイル径の平均値、下段はコイル径
の最小値を示す。[Table 1] Here, the upper part of the inner diameter shows the average value of the coil diameter, and the lower part shows the minimum value of the coil diameter.
【0022】[0022]
【発明の効果】本発明におけるようなD/dを満足する
線径の電熱線を用いると、継手成形後、長期間経過して
もプラスチック管挿入ができなくなるといったトラブル
を生ずることがない。またD/dの比を80以上、好ま
しくは90以上とすると、巻き線が困難となることはな
いうえ、コストを比較的低価格に抑えることができる。The use of a heating wire having a wire diameter satisfying D / d as in the present invention does not cause a trouble that the plastic pipe cannot be inserted even after a long period of time after the joint is formed. When the ratio of D / d is 80 or more, preferably 90 or more, the winding does not become difficult and the cost can be kept relatively low.
【図1】エレクトロフュージョン継手の断面図。FIG. 1 is a cross-sectional view of an electrofusion joint.
1・・エレクトロフュージョン継手 2・・電熱線 1. Electrofusion joint 2. Electric heating wire
Claims (8)
れ、プラスチック管との接合面に電熱線をコイル状に埋
設してプラスチック管と電気融着されるエレクトロフュ
ージョン継手において、継手にコイル状に埋設される電
熱線のコイル径Dと、電熱線の線径dの比D/dを14
5以下とし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 which is used for connecting a plastic pipe and in which a heating wire is embedded in a coil shape on a joint surface with the plastic pipe and which is electro-fused with the plastic pipe. The ratio D / d of the coil diameter D of the heating wire to the wire diameter d of the heating wire is 14
An electrofusion joint characterized in that the number is 5 or less.
エレクトロフュージョン継手。2. The electrofusion joint according to claim 1, wherein D / d is 120 or less.
載のエレクトロフュージョン継手。3. The electrofusion joint according to claim 1, wherein D / d is 80 or more.
載のエレクトロフュージョン継手。4. The electrofusion joint according to claim 1, wherein D / d is 90 or more.
れ、プラスチック管との接合面に電熱線をコイル状に埋
設してプラスチック管と電気融着されるエレクトロフュ
ージョン継手の製造法において、継手にコイル状に埋設
される電熱線のコイル径Dと電熱線の線径dの比D/d
が145以下となるような電熱線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の製造法。5. A method for manufacturing an electrofusion joint, which is used for connecting a plastic pipe and in which a heating wire is buried in a coil shape on a joint surface with the plastic pipe and is electrically fused to the plastic pipe. Ratio D / d of the coil diameter D of the heating wire buried in the shape and the wire diameter d of the heating wire
A method for producing an electrofusion joint, wherein a heating wire is used so that the value is 145 or less.
エレクトロフュージョン継手の製造法。6. The method for producing an electrofusion joint according to claim 5, wherein D / d is 120 or less.
載のエレクトロフュージョン継手の製造法。7. The method for producing an electrofusion joint according to claim 5, wherein D / d is 80 or more.
載のエレクトロフュージョン継手の製造法。8. The method for manufacturing an electrofusion joint according to claim 5, wherein D / d is 90 or more.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9204975A JPH1151280A (en) | 1997-07-30 | 1997-07-30 | Electrofusion joint and manufacture thereof |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9204975A JPH1151280A (en) | 1997-07-30 | 1997-07-30 | Electrofusion joint and manufacture thereof |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH1151280A true JPH1151280A (en) | 1999-02-26 |
Family
ID=16499402
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP9204975A Pending JPH1151280A (en) | 1997-07-30 | 1997-07-30 | Electrofusion joint and manufacture thereof |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH1151280A (en) |
-
1997
- 1997-07-30 JP JP9204975A patent/JPH1151280A/en active Pending
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