JP2001304481A - Forming method for electrofusion joint and electrofusion joint - Google Patents
Forming method for electrofusion joint and electrofusion jointInfo
- Publication number
- JP2001304481A JP2001304481A JP2000122530A JP2000122530A JP2001304481A JP 2001304481 A JP2001304481 A JP 2001304481A JP 2000122530 A JP2000122530 A JP 2000122530A JP 2000122530 A JP2000122530 A JP 2000122530A JP 2001304481 A JP2001304481 A JP 2001304481A
- Authority
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- Japan
- Prior art keywords
- heating wire
- inner layer
- layer
- joint
- thermoplastic resin
- 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.)
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- Branch Pipes, Bends, And The Like (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、熱可塑性樹脂の内
層の外面に電熱線を巻回し、この電熱線を覆うように熱
可塑性樹脂の外層を射出成形した後に、前記電熱線に通
電して内外層間を再融着する電気融着継手の成形方法及
び電気融着継手に関するものである。BACKGROUND OF THE INVENTION The present invention relates to a method for winding a heating wire on the outer surface of an inner layer of a thermoplastic resin, injection-molding an outer layer of the thermoplastic resin so as to cover the heating wire, and then applying a current to the heating wire. The present invention relates to a method for forming an electro-fusion joint for re-fusion between inner and outer layers and an electro-fusion joint.
【０００２】[0002]
【従来の技術】従来、この種のものとしては、特開平９
−２０７２２４号公報に示す図４のようなものがある。2. Description of the Related Art Conventionally, this type is disclosed in Japanese Unexamined Patent Publication No.
There is one shown in FIG.
【０００３】すなわち、図４において、外部コネクタ１
に連結されている電熱線２を、熱可塑性樹脂の内層４の
外面に巻回し、この電熱線２を覆うように、内層４の外
面に熱可塑性樹脂の二層５，６以上からなる外層７を射
出成形した２つの継手を、その端面３で突き合わせ融着
して、所定の長さに一体形成させた電気融着継手１０が
示されている。[0003] That is, in FIG.
Is wound around the outer surface of the inner layer 4 of the thermoplastic resin, and the outer layer 7 composed of two or more thermoplastic resin layers 5 and 6 is formed on the outer surface of the inner layer 4 so as to cover the heating wire 2. Are fused at the end face 3 of the two injection-molded joints to form an electro-fused joint 10 integrally with a predetermined length.
【０００４】この電気融着継手１０の成形においては、
常温に保たれている内層４の外面温度を４０℃以上に加
熱し、この加熱された内層４の外面に射出成形する外層
７の射出樹脂温度を２４０℃乃至２７０℃として形成さ
せている。また、前記内層４の外面に設けた電熱線２を
卷回させる溝は、１ｍｍ以下で形成させることが、開示
されている。In forming the electrofusion joint 10,
The outer surface temperature of the inner layer 4 which is kept at room temperature is heated to 40 ° C. or more, and the injection resin temperature of the outer layer 7 to be injection molded on the outer surface of the heated inner layer 4 is set to 240 ° C. to 270 ° C. It is also disclosed that the groove for winding the heating wire 2 provided on the outer surface of the inner layer 4 is formed to be 1 mm or less.
【０００５】[0005]
【発明が解決しようとする課題】このような従来のもの
にあっては、内層４の外面温度を４０℃以上の高温に設
定しているので、この熱により内層４に巻かれた電熱線
２が膨張して、外層７の射出成形時に電熱線２が溝４ａ
から外れて短絡したり、射出成形した外層７の冷却に時
間を要して生産性が低下するという問題が有った。In such a conventional device, since the outer surface temperature of the inner layer 4 is set to a high temperature of 40 ° C. or higher, the heating wire 2 wound around the inner layer 4 by this heat is used. Expands so that the heating wire 2 is formed in the groove 4a during the injection molding of the outer layer 7.
There is a problem that short-circuiting occurs, and that it takes time to cool the injection-molded outer layer 7 to lower the productivity.
【０００６】また、溝深さが１ｍｍ以下であるため、所
定の溝に電熱線２が巻き難い上に、内層４と外層７との
接触面積が小さく、充分な層間剥離強度が得難いという
問題もあった。Further, since the groove depth is 1 mm or less, the heating wire 2 is not easily wound around a predetermined groove, and the contact area between the inner layer 4 and the outer layer 7 is small, so that it is difficult to obtain sufficient delamination strength. there were.
【０００７】それで、この発明は、外層の射出成形によ
って内層に巻回された電熱線が外れることなく、また冷
却時間の短縮ができて生産性がよく、また電熱線の巻回
用の溝が深く外層との融着面積が広くとれて、充分な層
間剥離強度が得られる電気融着継手の成形方法及び電気
融着継手を提供することを目的としている。[0007] Therefore, the present invention provides a high productivity in which the heating wire wound on the inner layer does not come off by the injection molding of the outer layer, the cooling time can be reduced, and the heating wire winding groove is formed. An object of the present invention is to provide a method for forming an electro-fusion joint and a electro-fusion joint which can obtain a sufficient delamination strength by providing a deep area for fusion with an outer layer.
【０００８】[0008]
【課題を解決するための手段】上記目的を達成するた
め、請求項１に記載された発明は、熱可塑性樹脂の内層
の外面に電熱線を巻回し、この内層の外面に少なくとも
二層からなる熱可塑性樹脂の外層を電熱線を覆うように
射出成形する電気融着継手の成形方法において、前記内
層の外面温度を４０℃以下とし、かつ前記外層の成形型
内圧を３００ｋｇｆ／ｃｍ2以上、１０００ｋｇｆ／ｃ
ｍ2以下としたことを特徴としている。In order to achieve the above object, according to the first aspect of the present invention, a heating wire is wound around the outer surface of an inner layer of a thermoplastic resin, and the outer surface of the inner layer comprises at least two layers. In a method for forming an electro-fusion joint, wherein an outer layer of a thermoplastic resin is injection-molded so as to cover a heating wire, an outer surface temperature of the inner layer is set to 40 ° C. or less, and an inner mold pressure of the outer layer is set to 300 kgf / cm 2 or more and 1000 kgf / C
is characterized in that the m 2 or less.
【０００９】この様に成形条件を設定したものにあって
は、内層の外面温度を４０℃以下としたので、内層の上
面に射出された外層は、内層で冷やされて冷却が速くな
る。In the case where the molding conditions are set as described above, since the outer surface temperature of the inner layer is set to 40 ° C. or less, the outer layer injected onto the upper surface of the inner layer is cooled by the inner layer, and the cooling speed is increased.
【００１０】また、外層の成形型内圧を３００ｋｇｆ／
ｃｍ2以上、１０００ｋｇｆ／ｃｍ2以下としたので、内
層の外面に強い圧力がかかり、層間剥離強度が向上す
る。Further, the inner pressure of the outer layer forming mold is set to 300 kgf /
Since the pressure is not less than cm 2 and not more than 1000 kgf / cm 2 , a strong pressure is applied to the outer surface of the inner layer, and the delamination strength is improved.
【００１１】ここで、熱可塑性樹脂とは、特に限定する
ものではないが、具体的には高密度・中密度・低密度ポ
リエチレン、ポリプロピレン、ポリブテン、ポリアミ
ド、ポリエステル、ポリエーテルイミド、ポリエーテル
エーテルケトン、ポリエーテルサルフォン、ポリエーテ
ルサルファイド、ポリオキシメチレン、ＡＢＳ、ＡＥＳ
などを指している。Here, the thermoplastic resin is not particularly limited, but specifically, high density, medium density, low density polyethylene, polypropylene, polybutene, polyamide, polyester, polyetherimide, polyetheretherketone. , Polyether sulfone, polyether sulfide, polyoxymethylene, ABS, AES
And so on.
【００１２】また、ここで、電熱線とは、一例として、
ＪＩＳには実用電熱材として規定されているニクロム合
金を線状にした、いわゆるニクロム線を指している。そ
して、本実施の形態においては、線径が２ｍｍ程度のも
のを使用して、内層の外面に巻回し、外部に設けたコネ
クタと連結させている。Here, the heating wire is, for example,
JIS refers to a so-called nichrome wire in which a nichrome alloy specified as a practical electric heating material is linearized. In the present embodiment, a wire having a wire diameter of about 2 mm is used, wound around the outer surface of the inner layer, and connected to a connector provided outside.
【００１３】請求項２に記載された発明は、請求項１に
記載の電気融着継手の成形方法において、前記外層を射
出成形する前記熱可塑性樹脂の射出樹脂温度を２３０〜
２７０℃としたことを特徴としている。According to a second aspect of the present invention, in the method for forming an electro-fusion joint according to the first aspect, the temperature of the thermoplastic resin for injection-molding the outer layer is set to 230-200.
The temperature is set to 270 ° C.
【００１４】この様に成形条件を設定したものにあって
は、高い成形型内圧としたため、射出樹脂温度を２３０
〜２７０℃としても、内層の外面に射出された外層の層
間剥離強度が向上する。In the case where the molding conditions are set as described above, the injection resin temperature is set to 230
Even at a temperature of up to 270 ° C., the delamination strength of the outer layer injected onto the outer surface of the inner layer is improved.
【００１５】請求項３に記載された発明は、熱可塑性樹
脂の内層の外面に電熱線を巻回し、この内層の外面に少
なくとも二層からなる熱可塑性樹脂の外層を電熱線を覆
うように射出成形する電気融着継手において、前記内層
の外面に電熱線を巻回する溝を設け、この溝深さを前記
電熱線直径の０．５〜２倍としたことを特徴としてい
る。According to a third aspect of the present invention, a heating wire is wound around the outer surface of the inner layer of the thermoplastic resin, and at least two outer layers of the thermoplastic resin are injected onto the outer surface of the inner layer so as to cover the heating wire. In the electrofusion joint to be formed, a groove for winding a heating wire is provided on the outer surface of the inner layer, and the depth of the groove is 0.5 to 2 times the diameter of the heating wire.
【００１６】この様に形状を設定したものにあっては、
溝深さを電熱線直径の０．５〜２倍としたので、電熱線
を覆うように射出成形しても、電熱線は、溝から外れる
ことなく所定の位置に成形することができる。In the case of setting the shape in this way,
Since the groove depth is 0.5 to 2 times the diameter of the heating wire, the heating wire can be formed at a predetermined position without coming off the groove even by injection molding so as to cover the heating wire.
【００１７】請求項４に記載された発明は、熱可塑性樹
脂の内層の外面に電熱線を巻回し、この内層の外面に少
なくとも二層からなる熱可塑性樹脂の外層を電熱線を覆
うように射出成形する電気融着継手の成形方法におい
て、前記電気融着継手の内層の外面に、電熱線を巻回す
る溝を電熱線直径の０．５〜２倍に形成させ、この前記
内層の外面温度を４０℃以下とすると共に、前記外層の
成形型内圧を３００ｋｇｆ／ｃｍ2以上、１０００ｋｇ
ｆ／ｃｍ2以下とし、その時の射出樹脂温度を２３０〜
２７０℃としたことを特徴としている。According to a fourth aspect of the present invention, a heating wire is wound around the outer surface of the inner layer of the thermoplastic resin, and at least two outer layers of the thermoplastic resin are injected onto the outer surface of the inner layer so as to cover the heating wire. In the method for forming an electro-fusion joint to be formed, a groove for winding a heating wire is formed on the outer surface of the inner layer of the electro-fusion joint so as to have a diameter of 0.5 to 2 times the diameter of the heating wire. To 40 ° C. or lower, and the internal pressure of the outer layer in the mold is set to 300 kgf / cm 2 or more and 1000 kg
f / cm 2 or less, and the injection resin temperature at that time is 230 to
The temperature is set to 270 ° C.
【００１８】この様に形状及び成形条件を設定したもの
にあっては、溝から外れることなく電熱線が巻回された
内層の外面に、高い成形型内圧になるように外層用樹脂
が設定温度域で射出され外層が形成されるので、充分に
層間が融着した電気融着継手が成形できる。したがっ
て、仮に融着が不充分なところがあっても、短絡するこ
となく溝内に巻回された電熱線により、再融着できて完
全な融着を得ることができる。In the case where the shape and the molding conditions are set as described above, the resin for the outer layer is set on the outer surface of the inner layer on which the heating wire is wound so as to have a high mold inner pressure without coming off the groove. Since the outer layer is formed by injection in the region, it is possible to form an electro-fusion joint in which the layers are sufficiently fused. Therefore, even if there is a place where the fusion is insufficient, the fusion can be performed again by the heating wire wound in the groove without short-circuiting, and complete fusion can be obtained.
【００１９】[0019]
【発明の実施の形態】以下、この発明に係る電気融着継
手の成形方法及び電気融着継手の発明の実施の形態を図
１〜図３に基づいて説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for forming an electro-fusion joint and an embodiment of the electro-fusion joint according to the present invention will be described below with reference to FIGS.
【００２０】図１において、２１は電気融着継手で、径
違いの管を継ぐ段付き継手になっており、左右の開口２
３１，２３２の径を異にしている。図１の断面部に示す
ように、段付き薄肉管である内層２３を設け、この内層
２３の外面２３ａを覆うように所定の肉厚に成形した下
層２２ｂを設け、この下層２２ｂの外面を覆うように所
定の肉厚に成形した上層２２ａを設けて、多層の電気融
着継手２１を構成させている。In FIG. 1, reference numeral 21 denotes an electric fusion joint, which is a stepped joint for joining pipes of different diameters, and has left and right openings 2.
31 and 232 have different diameters. As shown in the cross-sectional portion of FIG. 1, an inner layer 23 which is a stepped thin tube is provided, a lower layer 22b formed to a predetermined thickness so as to cover an outer surface 23a of the inner layer 23 is provided, and an outer surface of the lower layer 22b is covered. An upper layer 22a formed to a predetermined thickness is provided as described above to form a multilayer electric fusion joint 21.
【００２１】また、内層２３の外面２３ａの一部には、
周回する所定の深さの溝２３Ａを形成させている。Further, a part of the outer surface 23a of the inner layer 23 includes
A circumferential groove 23A having a predetermined depth is formed.
【００２２】そして、この溝２３Ａには電熱線２５を巻
回させ、その端部は外層２２の所定の位置に設けたコネ
クタ２６に結線させている。したがって、このコネクタ
２６により外部から通電でき電熱線２５を発熱させて、
内外層２２，２３の接面部２４を再融着させて融着でき
る構成としている。A heating wire 25 is wound around the groove 23A, and its end is connected to a connector 26 provided at a predetermined position on the outer layer 22. Therefore, the connector 26 allows the power to be supplied from the outside and causes the heating wire 25 to generate heat,
The contact surface portion 24 of the inner and outer layers 22 and 23 can be re-fused and fused.
【００２３】図２においては、内層２３と下層２２ｂと
の接面部２４を示している。そして、内層２３の外面に
は溝２３Ａが形成され、この溝２３Ａに電熱線２５を巻
回され、この電熱線２５を覆うように下層２２ｂが射出
成形されて、電熱線２５を上下から抱え込む接面部２４
が形成された状態を示している。FIG. 2 shows a contact surface 24 between the inner layer 23 and the lower layer 22b. A groove 23A is formed on the outer surface of the inner layer 23. A heating wire 25 is wound around the groove 23A. A lower layer 22b is injection-molded so as to cover the heating wire 25, and a contact holding the heating wire 25 from above and below is formed. Face part 24
Shows a state in which is formed.
【００２４】また、図２中、ｈは溝深さを示している。
この溝深さｈは、電熱線２５直径の０．５倍（設定値の
下限）である場合の例を示している。In FIG. 2, h indicates a groove depth.
This example shows a case where the groove depth h is 0.5 times the diameter of the heating wire 25 (the lower limit of the set value).
【００２５】図３においては、図２と同様に接面部２４
を示しており、図３中、Ｈは溝深さを示しており、この
溝深さＨは、電熱線２５直径の２倍（設定値の上限）で
ある場合の例を示している。そして、図２の場合と同様
に、この溝２３Ａに電熱線２５が巻回され、その上から
下層２２ｂの樹脂が射出成形されて、この電熱線２５を
溝２３Ａの中に埋め込むように形成された接面部２４を
示している。In FIG. 3, as in FIG.
In FIG. 3, H indicates a groove depth, and the groove depth H is an example in a case where the groove depth H is twice the diameter of the heating wire 25 (upper limit of the set value). As in the case of FIG. 2, the heating wire 25 is wound around the groove 23A, the resin of the lower layer 22b is injection-molded from above, and the heating wire 25 is formed so as to be embedded in the groove 23A. FIG.
【００２６】上述したように、溝深さｈ，Ｈを電熱線２
５直径の０．５〜２倍の間に設定することによって、電
熱線２５は、溝２３Ａから外れて短絡することなく、所
定の間隔に巻回することができる。As described above, the groove depths h and H are
By setting the diameter between 0.5 and 2 times the diameter, the heating wire 25 can be wound at a predetermined interval without coming off the groove 23A and causing a short circuit.
【００２７】したがって、続く外層２２の射出成形にお
いても、電熱線２５は外れることなく成形されて、その
後の外部からの通電で、電熱線２５は均質な発熱となっ
て、所望の層間剥離強度の得られる再融着が可能とな
る。Therefore, even in the subsequent injection molding of the outer layer 22, the heating wire 25 is formed without being detached, and the heating wire 25 is uniformly heated by the subsequent energization from the outside, and has a desired delamination strength. The resulting re-fusion is possible.
【００２８】[0028]
【実施例】以下に、電気融着継手の呼び径２００ｍｍの
ものの実施例を検査結果とともに示す。すなわち、内層
の外面に外層を射出成形した後、通電し発熱させて融着
させ、２４時間後の内外層間の剥離の有無を目視検査し
た。EXAMPLE An example of an electro-fusion joint having a nominal diameter of 200 mm is shown below together with the inspection results. That is, after the outer layer was injection-molded on the outer surface of the inner layer, electricity was applied to generate heat and fused, and the presence or absence of peeling between the inner and outer layers after 24 hours was visually inspected.
【００２９】そして結果として、実施例・比較例での成
形条件及び検査結果を、表１に一覧表示した通り、前述
した設定形状・成形条件を適用した実施例のものは、全
て所望の剥離強度を有する電気融着継手として成形でき
ることが確認できた。As a result, the molding conditions and inspection results in the examples and comparative examples are listed in Table 1, and all of the examples in which the above-mentioned set shapes and molding conditions are applied have the desired peel strength. It was confirmed that the joint could be formed as an electrofusion joint having the following.
【００３０】なお、成形型内圧は、成形型のキャビティ
面に埋め込んだ圧力計で計測した。外層用熱可塑性樹脂
の射出樹脂温度は、パージ樹脂の温度を表面温度計で計
測した。また、内層に設けた電熱線を巻回する溝深さ
は、電熱線直径２ｍｍを１とした相対値で示した。ま
た、ここで使用した上層及び下層の熱可塑性樹脂は、何
れも高密度ポリエチレンとした。The internal pressure of the mold was measured by a pressure gauge embedded in the cavity surface of the mold. The injection resin temperature of the thermoplastic resin for the outer layer was measured by measuring the temperature of the purge resin with a surface thermometer. The depth of the groove around which the heating wire provided in the inner layer was wound was shown as a relative value where the heating wire diameter was 2 mm. The upper and lower thermoplastic resins used here were both high-density polyethylene.
【００３１】［実施例１］図１に示す形状とほぼ同形状
で内層と外層とからなる電気融着継手（呼び径２００ｍ
ｍ）を、射出成形して形成させた。このときの成形条件
は、表１に示す通りである。Example 1 An electric fusion joint (nominal diameter: 200 m) having substantially the same shape as shown in FIG.
m) was formed by injection molding. The molding conditions at this time are as shown in Table 1.
【００３２】検査結果：内外層間に剥離は全く見られ
ず、良好である。Inspection result: No peeling was observed between the inner and outer layers, which was good.
【００３３】［実施例２］実施例１と同様に電気融着継
手を成形した。このときの成形条件は、表１に示す通り
である。Example 2 An electrofusion joint was formed in the same manner as in Example 1. The molding conditions at this time are as shown in Table 1.
【００３４】検査結果：内外層間に剥離は全く見られ
ず、良好である。Inspection result: No peeling was observed between the inner and outer layers, and it was good.
【００３５】［実施例３］実施例１と同様に電気融着継
手を成形した。このときの成形条件は、表１に示す通り
である。Example 3 An electrofusion joint was formed in the same manner as in Example 1. The molding conditions at this time are as shown in Table 1.
【００３６】検査結果：内外層間に剥離は全く見られ
ず、良好である。Inspection result: No peeling was observed between the inner and outer layers, and the result was good.
【００３７】［実施例４］実施例１と同様に電気融着継
手を成形した。このときの成形条件は、表１に示す通り
である。Example 4 An electrofusion joint was formed in the same manner as in Example 1. The molding conditions at this time are as shown in Table 1.
【００３８】検査結果：内外層間に剥離は全く見られ
ず、良好である。Inspection result: No peeling was observed between the inner and outer layers, and the result was good.
【００３９】［実施例５］実施例１と同様に電気融着継
手を成形した。このときの成形条件は、表１に示す通り
である。Example 5 An electrofusion joint was formed in the same manner as in Example 1. The molding conditions at this time are as shown in Table 1.
【００４０】検査結果：内外層間に剥離は全く見られ
ず、良好である。Inspection result: No peeling was observed between the inner and outer layers, and the result was good.
【００４１】〔比較例１〕実施例１と同様の電気融着継
手を成形した。このときの成形条件は、表１に示す通り
である。Comparative Example 1 An electrofusion joint similar to that of Example 1 was formed. The molding conditions at this time are as shown in Table 1.
【００４２】検査結果：外層成形型の内圧が２００ｋｇ
ｆ／ｃｍ2 と低すぎて、内外層間に空気が残り、検査数
１０個のうち１個に、剥離がみられた。Inspection result: The inner pressure of the outer layer mold was 200 kg
It was too low as f / cm 2, and air remained between the inner and outer layers, and peeling was observed in one of the ten inspections.
【００４３】〔比較例２〕実施例１と同様の電気融着継
手を成形した。このときの成形条件は、表１に示す通り
である。Comparative Example 2 An electrofusion joint similar to that of Example 1 was formed. The molding conditions at this time are as shown in Table 1.
【００４４】検査結果：内層の溝深さが３倍と大きすぎ
て、内層の溝部に空気が閉じ込められて残り、検査数１
０個のうち２個に、剥離が見られた。Inspection result: The groove depth of the inner layer was too large as three times, air was trapped in the groove of the inner layer, and the number of inspections was 1
Peeling was observed in 2 out of 0 pieces.
【００４５】[0045]
【表１】 [Table 1]
【００４６】[0046]
【発明の効果】本発明に係る電気融着継手の成形方法及
び電気融着継手は、請求項１の発明によれば、内層の外
面温度を４０℃以下としたので、内層の上面に射出した
外層の冷却が速くなる。したがって、生産性が上がりコ
ストの低減が図れる。According to the first aspect of the present invention, since the outer surface temperature of the inner layer is set to 40 ° C. or less, the injection method is performed on the upper surface of the inner layer. The outer layer cools faster. Therefore, productivity can be increased and cost can be reduced.
【００４７】また、外層の成形型内圧を３００ｋｇｆ／
ｃｍ2以上、１０００ｋｇｆ／ｃｍ2以下としたので、内
層の外面に強い圧力がかかり、層間剥離強度が向上す
る。したがって、各層間での剥離が防止できて、品質の
向上が図れる。Further, the inner pressure of the outer layer mold is set to 300 kgf /
Since the pressure is not less than cm 2 and not more than 1000 kgf / cm 2 , a strong pressure is applied to the outer surface of the inner layer, and the delamination strength is improved. Therefore, peeling between the layers can be prevented, and the quality can be improved.
【００４８】請求項２の発明によれば、射出樹脂温度を
２３０〜２７０℃としたので、この高い射出樹脂温度に
よって、内層の外面に射出された外層との層間剥離強度
が向上する。したがって、各層間での剥離が防止でき
て、品質の向上が図れる。According to the second aspect of the present invention, since the injection resin temperature is set to 230 to 270 ° C., this high injection resin temperature improves the delamination strength between the inner layer and the outer layer injected onto the outer surface of the inner layer. Therefore, peeling between the layers can be prevented, and the quality can be improved.
【００４９】請求項３の発明によれば、溝深さを電熱線
直径の０．５〜２倍としたので、電熱線は溝から外れる
ことなく巻回することができる。したがって、所定の位
置に安定して生産性よく巻回ができ、また、溝から外れ
難いので、電熱線が短絡することが防止できる。したが
って、通電させても所定の温度となって、再融着が確実
に行える安定した電気融着継手が得られる。According to the third aspect of the present invention, since the depth of the groove is 0.5 to 2 times the diameter of the heating wire, the heating wire can be wound without coming off the groove. Therefore, winding can be performed stably at a predetermined position with good productivity, and since it is hard to come off from the groove, short-circuiting of the heating wire can be prevented. Therefore, a stable temperature of the fusion-bonded joint can be obtained even when the electric current is supplied, and the temperature becomes a predetermined temperature and the re-fusion can be reliably performed.
【００５０】請求項４の発明によれば、溝から外れるこ
となく電熱線が巻回された内層の外面に、高い成形型内
圧で、また所定の射出樹脂温度の外層用熱可塑性樹脂が
射出されるので、充分に層間が融着した電気融着継手が
成形できる。したがって、電熱線の加熱で再融着させて
も剥離を起こすことがなく、品質の安定が図れる。According to the fourth aspect of the present invention, the thermoplastic resin for the outer layer is injected at a high molding die pressure and at a predetermined injection resin temperature onto the outer surface of the inner layer around which the heating wire is wound without coming off the groove. Therefore, an electro-fusion joint in which the layers are sufficiently fused can be formed. Therefore, even if re-fusing is performed by heating the heating wire, there is no separation, and the quality can be stabilized.
【図面の簡単な説明】[Brief description of the drawings]
【図１】本発明に係る実施の形態の電気融着継手を一部
断面で示す説明図である。FIG. 1 is an explanatory view showing a partially cross-sectional view of an electrofusion joint according to an embodiment of the present invention.
【図２】図１の接面部の溝深さｈを示す説明図である。FIG. 2 is an explanatory diagram showing a groove depth h of a contact surface portion in FIG. 1;
【図３】図１の接面部の溝深さＨを示す説明図である。FIG. 3 is an explanatory view showing a groove depth H of a contact surface portion in FIG. 1;
【図４】従来技術に係る電気融着継手を示す説明図であ
る。FIG. 4 is an explanatory view showing an electrofusion joint according to the related art.
【符号の説明】 ２１…電気融着継手 ２２…外層 ２３…内層 ２３ａ…外面 ２３Ａ…溝 ２５…電熱線[Explanation of Symbols] 21: electric fusion joint 22: outer layer 23: inner layer 23a: outer surface 23A: groove 25: heating wire
Claims (4)
回し、この内層の外面に少なくとも二層からなる熱可塑
性樹脂の外層を、前記電熱線を覆うように、射出成形す
る電気融着継手の成形方法において、 前記内層の外面温度を４０℃以下とし、かつ前記外層の
成形型内圧を３００ｋｇｆ／ｃｍ2以上、１０００ｋｇ
ｆ／ｃｍ2以下としたことを特徴とする電気融着継手の
成形方法。1. An electrofusion method in which a heating wire is wound around an outer surface of an inner layer of a thermoplastic resin, and an outer layer of at least two layers of the thermoplastic resin is injection-molded on the outer surface of the inner layer so as to cover the heating wire. In the method of forming a joint, the outer surface temperature of the inner layer is set to 40 ° C. or less, and the inner pressure of the outer layer forming mold is set to 300 kgf / cm 2 or more and 1000 kg.
f / cm 2 or less, a method for forming an electrofusion joint.
脂の射出樹脂温度を２３０〜２７０℃としたことを特徴
とする請求項１に記載の電気融着継手の成形方法。2. The method according to claim 1, wherein an injection resin temperature of the thermoplastic resin for injection-molding the outer layer is set to 230 to 270 ° C.
回し、この内層の外面に少なくとも二層からなる熱可塑
性樹脂の外層を、前記電熱線を覆うように、射出成形す
る電気融着継手において、 前記内層の外面に前記電熱線を巻回させる溝を設け、こ
の溝深さを前記電熱線直径の０．５〜２倍としたことを
特徴とする電気融着継手。3. An electrofusion method in which a heating wire is wound around an outer surface of an inner layer of a thermoplastic resin, and an outer layer of at least two layers of the thermoplastic resin is injection-molded on the outer surface of the inner layer so as to cover the heating wire. A joint according to claim 1, wherein a groove for winding the heating wire is provided on an outer surface of the inner layer, and a depth of the groove is 0.5 to 2 times a diameter of the heating wire.
回し、この内層の外面に少なくとも二層からなる熱可塑
性樹脂の外層を、前記電熱線を覆うように、射出成形す
る電気融着継手の成形方法において、 前記電気融着継手の前記内層の外面に、前記電熱線を巻
回させる溝を電熱線直径の０．５〜２倍に形成させ、こ
の前記内層の外面温度を４０℃以下とすると共に、 前記外層の成形型内圧を３００ｋｇｆ／ｃｍ2以上、１
０００ｋｇｆ／ｃｍ2以下とし、その時の射出樹脂温度
を２３０〜２７０℃としたことを特徴とする電気融着継
手の成形方法。4. An electrofusion method in which a heating wire is wound around an outer surface of an inner layer of a thermoplastic resin, and an outer layer of at least two layers of the thermoplastic resin is injection-molded on the outer surface of the inner layer so as to cover the heating wire. In the method for forming a joint, a groove for winding the heating wire is formed on the outer surface of the inner layer of the electrofusion joint to have a diameter of 0.5 to 2 times a heating wire diameter, and the outer surface temperature of the inner layer is set to 40 ° C. And the internal pressure of the outer layer is 300 kgf / cm 2 or more.
000 kgf / cm 2 or less, and the injection resin temperature at that time is 230 to 270 ° C. A method for forming an electro-fusion joint.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000122530A JP4511683B2 (en) | 2000-04-24 | 2000-04-24 | Method for forming electrofusion joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000122530A JP4511683B2 (en) | 2000-04-24 | 2000-04-24 | Method for forming electrofusion joint |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001304481A true JP2001304481A (en) | 2001-10-31 |
| JP4511683B2 JP4511683B2 (en) | 2010-07-28 |
Family
ID=18632993
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000122530A Expired - Lifetime JP4511683B2 (en) | 2000-04-24 | 2000-04-24 | Method for forming electrofusion joint |
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| Country | Link |
|---|---|
| JP (1) | JP4511683B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011102644A (en) * | 2011-01-06 | 2011-05-26 | Waters Technologies Corp | Pipe joint and method for coupling pipes |
| US8951374B2 (en) | 2003-07-15 | 2015-02-10 | Waters Technologies Corporation | Tube joint and a method of bonding tubes |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09207224A (en) * | 1996-01-31 | 1997-08-12 | Hitachi Metals Ltd | Electrofusion-type pipe joint and its manufacture |
| JP3571849B2 (en) * | 1996-05-28 | 2004-09-29 | 三菱樹脂株式会社 | Manufacturing method of electric fusion joint |
-
2000
- 2000-04-24 JP JP2000122530A patent/JP4511683B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8951374B2 (en) | 2003-07-15 | 2015-02-10 | Waters Technologies Corporation | Tube joint and a method of bonding tubes |
| JP2011102644A (en) * | 2011-01-06 | 2011-05-26 | Waters Technologies Corp | Pipe joint and method for coupling pipes |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4511683B2 (en) | 2010-07-28 |
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