JPH0315120A - Manufacture of insulated power cable - Google Patents

Manufacture of insulated power cable

Info

Publication number
JPH0315120A
JPH0315120A JP14815889A JP14815889A JPH0315120A JP H0315120 A JPH0315120 A JP H0315120A JP 14815889 A JP14815889 A JP 14815889A JP 14815889 A JP14815889 A JP 14815889A JP H0315120 A JPH0315120 A JP H0315120A
Authority
JP
Japan
Prior art keywords
conductor
nipple
insulator
inner diameter
diameter
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
JP14815889A
Other languages
Japanese (ja)
Inventor
Shigeru Kato
茂 加藤
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.)
Hitachi Cable Ltd
Original Assignee
Hitachi Cable 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 Hitachi Cable Ltd filed Critical Hitachi Cable Ltd
Priority to JP14815889A priority Critical patent/JPH0315120A/en
Publication of JPH0315120A publication Critical patent/JPH0315120A/en
Pending legal-status Critical Current

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  • Processes Specially Adapted For Manufacturing Cables (AREA)

Abstract

PURPOSE:To obtain the title cable coated with a highly foamed and uniform insulating material without being eccentric by keeping the inner diameter of a through hole of a nipple to which a conductor is lead and the outer diameter of the conductor within a prescribed relation. CONSTITUTION:The inner diameter d1 of a through hole of a nipple 2 to which a conductor 1 is lead and the outer diameter d2 of the conductor 1 is kept in a relation of d1<=d2, and an insulator 4 is formed on the outer surrounding of the conductor passed through the hole of the nipple 2 by extrusion. Since the inner diameter d1 of the through hole of the nipple is the same as or smaller than the outer diameter d2 of the conductor, a gap is not formed between the inner diameter d1 and the diameter d2 and thus gas leakage is prevented and a highly foamed insulator 4 is obtained. Also, since no gap between the inner diameter d1 and the outer diameter d2, the conductor is prevented from slight bending and switching, and as a result the conductor is prevented from becoming eccentric and coated with the foamed insulator 4 uniformly.

Description

【発明の詳細な説明】 [産業上の利用分野] 本発明は、絶縁電線の製造方法に関し、特に発泡絶縁電
線の製造方法に関するものである。
DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for manufacturing an insulated wire, and particularly to a method for manufacturing a foam insulated wire.

〔従来の技術〕[Conventional technology]

従来、導体外周に発泡絶縁体を押出し1&覆した発泡絶
縁電線を製造する方法としては、第2図に示すようにク
ロスヘッド内に取付けたニツブル6の通過孔に導体lを
通過させ、その通過した導体1をダイス3の通過孔を通
過させて導体1外周に発泡絶縁体4を押出し披覆して発
泡絶縁電線7を製造する方法が知られている。
Conventionally, as a method for manufacturing a foam insulated wire by extruding a foam insulator around the outer circumference of a conductor and covering it, the conductor is passed through a passage hole of a nibble 6 installed in a crosshead, as shown in Fig. 2, and the conductor is A method is known in which a foamed insulated wire 7 is manufactured by passing the conductor 1 through a passage hole of a die 3 and extruding a foamed insulator 4 around the conductor 1 to cover it.

このとき、前記したニップルの通過孔の先端部内径d1
は導体外径d2に対してdl >d2の関係を満たすよ
うに設定されている。特に無調心クロスヘッドの言及に
より前記ニップルの通過孔の先端部内径dlと導体外径
d2の径の比率は1.006≦dl/d2≦1.05の
関係と小さくなっているが、その内径d1と外径d2間
にはギャップが形成されている。
At this time, the inner diameter d1 of the tip of the passage hole of the nipple described above
is set to satisfy the relationship dl > d2 with respect to the conductor outer diameter d2. In particular, with reference to the non-aligning crosshead, the ratio of the inner diameter dl of the tip of the nipple passage hole to the outer diameter d2 of the conductor is small, with a relationship of 1.006≦dl/d2≦1.05. A gap is formed between the inner diameter d1 and the outer diameter d2.

【発明が解決しようとする課題] しかし、前記した従来の発泡絶縁電線の製造方法では、
シリンダー内で混練されながら所定の温度に上げられ、
分解してガスを発生しクロスヘッド内に導かれる発泡剤
を含有する軟化した熱可塑性樹脂は、ニップルの通過孔
を通りダイスの通過孔を通過する導体の外周に押出し被
覆され、ダイス通過直後に前記ガスが拡散されて発泡絶
縁体を形成するため、前記ニップルの通過孔の先端部内
径d1が前記導体外径d2より大きいことから、その内
径dl、外径d2間のギャップからガスが導体の入線側
へと漏洩するので高発泡の発泡絶縁体が得られず、高発
泡度の発泡絶縁電線を製造するのに難しい方法であった
[Problems to be Solved by the Invention] However, in the conventional foam insulated wire manufacturing method described above,
While being kneaded in a cylinder, it is raised to a predetermined temperature,
A softened thermoplastic resin containing a blowing agent that decomposes to generate gas and is guided into the crosshead is extruded and coated on the outer periphery of the conductor that passes through the passage hole of the nipple and the passage hole of the die, and immediately after passing through the die. Since the gas is diffused to form a foamed insulator, since the inner diameter d1 of the tip of the passage hole of the nipple is larger than the outer diameter d2 of the conductor, the gas flows from the gap between the inner diameter dl and the outer diameter d2 of the conductor. Since it leaked to the incoming wire side, a highly foamed insulator could not be obtained, and this method was difficult to produce a highly foamed insulated wire.

また、ニップルの通過孔の先端部内径dlと導体外径d
z間で形成されたギャップにより、導体の小さい曲がり
及び導体の振れを矯正できず、偏心を発生すると共に均
一な発泡の発泡絶縁体が得られないという問題がある。
Also, the inner diameter dl of the tip of the nipple passage hole and the outer diameter d of the conductor.
Due to the gap formed between z, small bends in the conductor and deflection of the conductor cannot be corrected, resulting in eccentricity and a problem in that a uniformly foamed insulator cannot be obtained.

本発明は前記した従来技術の欠点を改善し、偏心のない
、均一で高発泡度の地縁体からなる絶縁電線の製造方法
の提供を目的とするものである。
The present invention aims to improve the above-mentioned drawbacks of the prior art and to provide a method for manufacturing an insulated wire made of a uniform, highly foamed ground edge without eccentricity.

[課題を解決するための手段〕 本発明は、クロスヘッド内に設けたニップルとダイスの
各通過孔に導体を通過させ、該導体外周に絶緑体を押出
E,披覆する絶縁電線の製造方法において、前記ニップ
ルの通過孔内径d1と前記導体外径d2とがdi≦d2
の関係を満たすようにして、該ニップルの通過孔を通過
した導体外周に絶縁体を押出し被覆するように構威した
ものである。
[Means for Solving the Problems] The present invention is directed to manufacturing an insulated wire in which a conductor is passed through each passage hole of a nipple and a die provided in a crosshead, and an insulated wire is extruded and covered around the outer periphery of the conductor. In the method, an inner diameter d1 of the passage hole of the nipple and an outer diameter d2 of the conductor satisfy di≦d2.
An insulator is extruded and coated on the outer periphery of the conductor that has passed through the passage hole of the nipple so as to satisfy the following relationship.

絶縁体としてはポリエチレン、発泡ポリエチレン、ポリ
プロピレン、発泡ボリブロビレン、ポリ塩化ビニル等の
熱可塑性樹脂が使用される。
As the insulator, thermoplastic resins such as polyethylene, foamed polyethylene, polypropylene, foamed polypropylene, and polyvinyl chloride are used.

[作  用1 本発明では、導体が通過するニツブルの通過孔内径d!
ど導体外径d2とがd1≦d2の関係を満たずようにし
で、該ニップルの通過孔を通過した導体外周に絶縁体を
押出し被覆するように形成したから、ニップルの通過孔
内径d1は導体外径d2と同じか、もしくは小さいので
その内径dl外fM d Z間にギャップが形成されな
いから、ガスの一洩を防止できるので高発泡の発泡絶縁
体が得られ、高発泡度の絶緑電線をfEJ込ずるこ己が
できる。また、内径d+,外径82間にギヤ・ノグがj
じ成されないから、導体の小さい曲がF)及び導体の振
れを矯正でき、偏心の発生をηくすとt(に、均一な発
泡の発泡絶縁体が得られる。
[Function 1 In the present invention, the inner diameter d of the passage hole of the nibble through which the conductor passes!
Since the outer diameter d2 of the conductor does not satisfy the relationship d1≦d2 and the outer periphery of the conductor passing through the nipple passage hole is extruded and coated with an insulator, the inner diameter d1 of the nipple passage hole is the same as that of the conductor. Since the outer diameter is the same as or smaller than the outer diameter d2, no gap is formed between the inner diameter dl and the outer fM d Z, which prevents gas from leaking, resulting in a highly foamed foam insulator and a highly foamed non-green electric wire. I can do it myself. Also, there is a gear nog between the inner diameter d+ and the outer diameter 82.
Since the conductor is not bent, the small curve of the conductor can be corrected and the deflection of the conductor can be corrected, and by reducing the occurrence of eccentricity η, a uniformly foamed foam insulator can be obtained.

F実 施 例] 第1図は本発明の絶縁電線の製造方法の一実施例を示す
ものである。
F Example] FIG. 1 shows an example of the method for manufacturing an insulated wire of the present invention.

1は導体、2はニップル、3はダイス、4は絶縁体、5
は発泡ポリエチレン絶縁電線である。
1 is a conductor, 2 is a nipple, 3 is a die, 4 is an insulator, 5
is a foamed polyethylene insulated wire.

導体は素線径1.05g厘の軟鋼単線からなり、絶縁体
4は発泡ポリエチレンからなる。
The conductor is made of a single mild steel wire with a wire diameter of 1.05 g, and the insulator 4 is made of foamed polyethylene.

クロスヘッド内に取付けた先端部内径が1.  04同
からなる通過孔のニツブル2に、図示しない送出機から
繰り出された素線径1.05amの導体1を通過させる
。このとき、素線径1.”05+amの導体1はニップ
ル2の通過孔により1.04t+iに仲線される。そし
て、その通過し.た直後の素線径1.04mmの導体1
外周にダイス3を通過させて発泡ポリエチレンの絶縁体
4を押出し彼覆し、その絶縁体外径が5.0llI1の
発泡ポリエチレン絶縁電線5を製造した。この発泡ポリ
エチレン絶縁電線5の発泡度、静電容量を測定した結果
、発泡度49,5%、静電容量55.6±0.8PP/
一である。
The inner diameter of the tip installed inside the crosshead is 1. A conductor 1 having a wire diameter of 1.05 am fed out from a feeder (not shown) is passed through the nibble 2 of the passage hole made of the same material. At this time, the wire diameter is 1. "05+am conductor 1 is connected to 1.04t+i through the passage hole of nipple 2. Then, immediately after passing through, conductor 1 with strand diameter 1.04mm
A die 3 was passed through the outer periphery of the wire to extrude and cover the foamed polyethylene insulator 4, thereby producing a foamed polyethylene insulated wire 5 having an outer diameter of 5.0llI1. As a result of measuring the foaming degree and capacitance of this foamed polyethylene insulated wire 5, the foaming degree was 49.5%, and the capacitance was 55.6±0.8PP/
It is one.

なお、押出速度、スクリュー回転、押出温度等の作業条
件を前記実施例と同じ条件に1,、第2図に示すように
比較例としてクロスヘッド内に取付けた先端部内径が1
、07ssからなる通過孔のニップル6に、図示し,な
い送出機から繰り出された素線径1.04mmの導体1
を通過させ、その通過直後の索線径!.04ir+の導
体1外周にダイス3を通過させて発泡ポリエチレンの絶
縁休4を押出し披覆し、その絶縁体外径が5。OIII
の発泡ポリエチレン絶縁電線7を製造した。この発7!
qポリエチレン絶縁電線70発泡度、静電容量を川定(
,た結果、発泡度46.9%、静電容量56.7±1.
0PP,一である。得られた発泡ポリエチレン絶縁電線
は比較例の発泡ポリエチレンに比べて発泡度が2.6%
向上し、静電容量を1.1PF/l改善することができ
た。
Note that the working conditions such as extrusion speed, screw rotation, and extrusion temperature were the same as in the previous example. As a comparative example, the inner diameter of the tip installed in the crosshead was
, 07ss, a conductor 1 with a wire diameter of 1.04 mm is fed out from a feeder (not shown) into the nipple 6 of the passage hole.
The diameter of the cable immediately after passing through it! .. A die 3 is passed through the outer periphery of the 04ir+ conductor 1, and an insulating layer 4 made of foamed polyethylene is extruded and covered, and the outer diameter of the insulator is 5. OIII
A foamed polyethylene insulated wire 7 was manufactured. This departure is 7!
q Polyethylene insulated wire 70 degree of foaming, capacitance determined (
As a result, the degree of foaming was 46.9%, and the capacitance was 56.7±1.
0PP, 1. The obtained foamed polyethylene insulated wire has a foaming degree of 2.6% compared to the foamed polyethylene of the comparative example.
It was possible to improve the capacitance by 1.1PF/l.

このように、導体が通過するニップルの通過孔の先端部
内径dlとその導体外径d2とかd+<dzの関係を満
たすようにして、該ニップルの通過孔を通過した導体外
周に発泡絶縁体を押出し彼覆する発泡絶縁電線の製造方
法であるかも、ガスの一洩を防止して高発泡の発泡ポリ
エチレン絶緑体が得られ、高発泡度の発泡ポリエチレン
絶縁体を製造することができた。また、ニップルの通過
孔の先端部内径と導体外径間にギャップが形成されない
ので、導体の小さい曲がり及び導体の振れを矯正でき、
偏心をなくすと共に均一な発泡の発泡絶縁体が得られた
In this way, the inner diameter dl of the tip of the nipple passage hole through which the conductor passes and the outer diameter d2 of the conductor satisfy the relationship d+<dz, and the foamed insulator is applied around the outer periphery of the conductor that has passed through the nipple passage hole. By using the extrusion method for producing a foamed insulated wire, it was possible to prevent gas leakage, obtain a highly foamed polyethylene insulator, and produce a foamed polyethylene insulator with a high degree of foaming. In addition, since no gap is formed between the inner diameter of the tip of the nipple passage hole and the outer diameter of the conductor, small bends in the conductor and deflection of the conductor can be corrected.
A foamed insulator with uniform foaming while eliminating eccentricity was obtained.

[発明の効果] 以上説明してきたように本発明の絶縁電線の製遣方法に
よれば、導体が通過するニツブルの通過孔内径d1と導
体外径d2とがd!≦d2の関係を満たすようにして、
該ニップルの通過孔を通過した導体外周に絶縁体を押出
し被覆するように構成したので、ニップルの通過孔内径
dlは導体外径d2と同じか、もしくは小さいので、そ
の内径dls外径dz間にギャップがないからガスの一
洩を防止でき、高発泡の発泡絶縁体が得られ、高発泡度
の絶縁電線を製造することができるという効果がある。
[Effects of the Invention] As explained above, according to the insulated wire manufacturing method of the present invention, the inner diameter d1 of the passage hole of the nibble through which the conductor passes and the outer diameter d2 of the conductor are d! By satisfying the relationship ≦d2,
Since the structure is such that an insulator is extruded and coated on the outer periphery of the conductor that has passed through the passage hole of the nipple, the inner diameter dl of the nipple passage hole is the same as or smaller than the outer diameter d2 of the conductor, so there is a difference between the inner diameter dls and the outer diameter dz. Since there is no gap, gas leakage can be prevented, a highly foamed insulator can be obtained, and an insulated wire with a high degree of foaming can be manufactured.

また、内径dl、外径dz間にギャップがないから導体
の小さい曲がり及び導体の振れを矯正でき、偏心の発生
をなくすと共に、均一な発泡の発泡絶縁体が得られると
いう効果がある。
Further, since there is no gap between the inner diameter dl and the outer diameter dz, small bends in the conductor and deflection of the conductor can be corrected, eccentricity can be eliminated, and a uniformly foamed insulator can be obtained.

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

第1図は本発明の絶縁電線の製造方法の一実施例を示す
断面説明図であり、第2図は従来の絶縁電線の製造方法
を示す断面説明図である。 1:導体       2:ニツプル 3:ダイス      4:絶縁体 5;発泡ポリエチレン 絶縁電線
FIG. 1 is an explanatory cross-sectional view showing one embodiment of the method for manufacturing an insulated wire according to the present invention, and FIG. 2 is an explanatory cross-sectional view showing a conventional method for manufacturing an insulated wire. 1: Conductor 2: Nipple 3: Dice 4: Insulator 5: Foamed polyethylene insulated wire

Claims (1)

【特許請求の範囲】[Claims] (1)クロスヘッド内に設けたニップルとダイスの各通
過孔に導体を通過させ、該導体外周に絶縁体を押出し被
覆する絶縁電線の製造方法において、前記ニップルの通
過孔内径d_1と前記導体外径d_2とがd_1≦d_
2の関係を満たすようにして、該ニップルの通過孔を通
過した導体外周に絶縁体を押出し被覆することを特徴と
する絶縁電線の製造方法。
(1) In a method for manufacturing an insulated wire in which a conductor is passed through each passage hole of a nipple and a die provided in a crosshead, and an insulator is extruded and coated on the outer periphery of the conductor, the inside diameter d_1 of the passage hole of the nipple and the outside of the conductor are The diameter d_2 is d_1≦d_
2. A method for manufacturing an insulated wire, which comprises extruding and coating an insulator on the outer periphery of a conductor that has passed through a passage hole of the nipple so as to satisfy the following relationship.
JP14815889A 1989-06-09 1989-06-09 Manufacture of insulated power cable Pending JPH0315120A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14815889A JPH0315120A (en) 1989-06-09 1989-06-09 Manufacture of insulated power cable

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14815889A JPH0315120A (en) 1989-06-09 1989-06-09 Manufacture of insulated power cable

Publications (1)

Publication Number Publication Date
JPH0315120A true JPH0315120A (en) 1991-01-23

Family

ID=15446555

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14815889A Pending JPH0315120A (en) 1989-06-09 1989-06-09 Manufacture of insulated power cable

Country Status (1)

Country Link
JP (1) JPH0315120A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4824081B2 (en) * 2006-03-13 2011-11-24 住友重機械工業株式会社 Injection molding machine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4824081B2 (en) * 2006-03-13 2011-11-24 住友重機械工業株式会社 Injection molding machine

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