JPH02301915A - Manufacture of highly cellular insulated cable - Google Patents
Manufacture of highly cellular insulated cableInfo
- Publication number
- JPH02301915A JPH02301915A JP12258989A JP12258989A JPH02301915A JP H02301915 A JPH02301915 A JP H02301915A JP 12258989 A JP12258989 A JP 12258989A JP 12258989 A JP12258989 A JP 12258989A JP H02301915 A JPH02301915 A JP H02301915A
- Authority
- JP
- Japan
- Prior art keywords
- steam
- pressure
- foam
- insulator
- conductor
- 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
- 238000004519 manufacturing process Methods 0.000 title claims description 7
- 230000001413 cellular effect Effects 0.000 title 1
- 239000006260 foam Substances 0.000 claims abstract description 16
- 239000012212 insulator Substances 0.000 claims abstract description 9
- 239000004020 conductor Substances 0.000 claims abstract description 6
- 239000007788 liquid Substances 0.000 claims abstract description 6
- 238000001816 cooling Methods 0.000 claims abstract description 3
- 239000011248 coating agent Substances 0.000 claims 1
- 238000000576 coating method Methods 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 5
- 238000001125 extrusion Methods 0.000 abstract description 4
- 238000010438 heat treatment Methods 0.000 abstract description 3
- 239000011810 insulating material Substances 0.000 abstract description 3
- 239000004698 Polyethylene Substances 0.000 abstract description 2
- 238000004898 kneading Methods 0.000 abstract description 2
- -1 polyethylene Polymers 0.000 abstract description 2
- 229920000573 polyethylene Polymers 0.000 abstract description 2
- 229920002545 silicone oil Polymers 0.000 abstract description 2
- 230000010261 cell growth Effects 0.000 abstract 2
- 239000011369 resultant mixture Substances 0.000 abstract 1
- 238000005187 foaming Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 238000007765 extrusion coating Methods 0.000 description 1
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野コ
本発明は高発泡体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 of manufacturing a highly foam insulated wire.
［従来の技術及び発明が解決しようとする課題］従来、
高発泡体絶縁電線を製造する際、例えば発泡剤を配合し
た甲すエチレンを押出機からダイスを経て大気中に押出
していたため、引き落しによる発泡度の低下や機械的強
度の低下を招来したり、また、引き落しを行わない場合
には押出速度が非常に遅いといった問題があった。[Prior art and problems to be solved by the invention] Conventionally,
When manufacturing high-foam insulated wires, for example, ethylene mixed with a foaming agent was extruded from an extruder through a die into the atmosphere, which resulted in a decrease in the degree of foaming and a decrease in mechanical strength due to drawdown. In addition, there was a problem that the extrusion speed was very slow when no drawdown was performed.
すなわち、従来の高発泡体絶縁電線の製造方法における
主な技術的課題は、（１）充分に高い発泡度を安定して
得ること、（２）外径を安定して得ること、（３）押出
速度を上げること、（４）機械的強度を向上させること
などであった。That is, the main technical issues in the conventional manufacturing method of high foam insulated wire are (1) stably obtaining a sufficiently high degree of foaming, (2) stably obtaining an outer diameter, and (3) (4) increasing the extrusion speed; and (4) improving mechanical strength.
本発明の目的は、前記した従来技術の課題を解決し、押
出速度を上げ、かつ、機械的強度を向上させることので
きる高発泡体絶縁電線の製造方法を提供することにある
。An object of the present invention is to provide a method for manufacturing a highly foam insulated wire that can solve the problems of the prior art described above, increase extrusion speed, and improve mechanical strength.
［課題を解決するための手段及び作用］上記の目的を達
成するために、本発明においては、導体上に管状発泡体
を押出被覆する際に、導体上に溶融状態で被覆されたの
ちダイスから吐出する絶縁体に対し、発泡成長が起こら
ない程度に十分な圧力と絶縁体を引き伸ばすのに十分な
温度を有する気体又は液体で加圧加熱しながら引き落し
を行い、十分に引き落しを行った後に外部冷却によって
発泡成長を完了させる。[Means and effects for solving the problem] In order to achieve the above object, in the present invention, when extrusion coating a conductor with a tubular foam, the conductor is coated in a molten state and then extruded from a die. The insulator to be discharged is drawn down while being pressurized and heated with a gas or liquid that has sufficient pressure to prevent foam growth and a temperature sufficient to stretch the insulator, and the insulator is sufficiently drawn down. Foam growth is then completed by external cooling.
［実施例］
以下、本発明の実施例を図面を参照して具体的に説明す
る。図は本発明を実施している状況を示す概略説明図で
ある。[Example] Hereinafter, an example of the present invention will be specifically described with reference to the drawings. The figure is a schematic explanatory diagram showing a situation in which the present invention is implemented.
ポリエチレンに液体フロンを注入して混練した材料をダ
イス２から水蒸気加圧装置３内に押出し、該装置３内で
引き落す。このとき該装置３内に、発泡成長が起こらな
い程度に十分な圧力と、絶縁体材料を引き伸ばすのに十
分な温度が与えられている。水蒸気加圧装置３を出た絶
縁体材料には発泡成長が生じ、該材料中に気泡が形成さ
れる。A material obtained by injecting liquid fluorocarbon into polyethylene and kneading it is extruded from a die 2 into a steam pressurizing device 3 and drawn down within the device 3. At this time, sufficient pressure is provided in the device 3 to prevent foam growth and a sufficient temperature to stretch the insulating material. Foam growth occurs in the insulator material leaving the steam pressurization device 3, and air bubbles are formed in the material.
なおこの実施例では、加圧加熱装置における媒体として
水蒸気を用いたが、水蒸気の代りにシリコンオイルなど
の液体を用いることによって、気体に比べて一層高い圧
力を得ることができる。In this example, water vapor was used as the medium in the pressure heating device, but by using a liquid such as silicone oil instead of water vapor, a higher pressure can be obtained than with gas.
［発明の効果］
以上説明した通り、本発明によれば、引き落しと発泡成
長の工程を分離することより、引き取り速度を向上させ
、かつ気泡形状がほぼ球形をした機械的強度の大きい高
発泡絶縁体を有する絶縁電線を製造することができる。[Effects of the Invention] As explained above, according to the present invention, by separating the drawing-off and foaming growth processes, the drawing-off speed is improved, and the highly foamed foam with a substantially spherical shape and high mechanical strength is produced. An insulated wire having an insulator can be manufactured.
図は本発明を実施している状況を示す概略説明図である
。
１：導体、
２：ダイス、
３：水蒸気加圧加熱装置、
４；発泡絶縁体。The figure is a schematic explanatory diagram showing a situation in which the present invention is implemented. 1: Conductor, 2: Dice, 3: Steam pressurization and heating device, 4: Foamed insulator.
Claims (1)
発泡体絶縁電線の製造方法において、導体上に溶融状態
で被覆されたのちダイスから吐出する絶縁体に対し、発
泡成長が起こらない程度に十分な圧力と絶縁体を引き伸
ばすのに十分な湿度を有する気体又は液体で加圧加熱し
ながら引き落しを行った後、外部冷却によって発泡成長
を完了させることを特徴とする高発泡体絶縁電線の製造
方法。1. In a method of manufacturing a foam insulated wire that involves extruding and coating a conductor with a tubular foam, the insulator is coated on the conductor in a molten state and then discharged from a die to the extent that foam growth does not occur. A high foam insulated wire characterized in that the wire is drawn down while being pressurized and heated with a gas or liquid having sufficient pressure and humidity to stretch the insulator, and then the foam growth is completed by external cooling. Production method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12258989A JPH02301915A (en) | 1989-05-16 | 1989-05-16 | Manufacture of highly cellular insulated cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12258989A JPH02301915A (en) | 1989-05-16 | 1989-05-16 | Manufacture of highly cellular insulated cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02301915A true JPH02301915A (en) | 1990-12-14 |
Family
ID=14839665
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12258989A Pending JPH02301915A (en) | 1989-05-16 | 1989-05-16 | Manufacture of highly cellular insulated cable |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02301915A (en) |
-
1989
- 1989-05-16 JP JP12258989A patent/JPH02301915A/en active Pending
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