JPS6350806B2 - - Google Patents
Info
- Publication number
- JPS6350806B2 JPS6350806B2 JP54075366A JP7536679A JPS6350806B2 JP S6350806 B2 JPS6350806 B2 JP S6350806B2 JP 54075366 A JP54075366 A JP 54075366A JP 7536679 A JP7536679 A JP 7536679A JP S6350806 B2 JPS6350806 B2 JP S6350806B2
- Authority
- JP
- Japan
- Prior art keywords
- cooling
- cooling medium
- temperature
- cylinder
- heating
- 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.)
- Expired
Links
Landscapes
- Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
- Processes Specially Adapted For Manufacturing Cables (AREA)
Description
【発明の詳細な説明】
本発明は架橋ポリオレフイン絶縁ケーブルの製
造装置の改良に関するもので、その目的とすると
ころは絶縁体架橋剤の加圧力を増大させてケーブ
ルの電気特性を向上させることにある。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a manufacturing device for a crosslinked polyolefin insulated cable, and its purpose is to improve the electrical properties of the cable by increasing the pressing force of the insulator crosslinking agent. .
架橋ポリオレフイン絶縁ケーブルの製造におけ
る架橋工程は一般に加熱加圧水蒸気によつて行わ
れていたが、この種の装置では架橋工程において
水蒸気が絶縁体中に浸透し、冷却工程で凝縮した
水が、時間の経過とともに蒸発し絶縁体中に多数
のポイドを形成するため、絶縁ケーブルの耐トリ
ーイング性、浸水課電特性をいちじるしく低下さ
せるという不利がある。さらに架橋時の加圧力を
高めることが困難であるため、電気特性の向上が
あまり期待できない。 The crosslinking process in the manufacture of crosslinked polyolefin insulated cables has generally been carried out using heated and pressurized steam, but in this type of equipment, water vapor penetrates into the insulation during the crosslinking process, and water condenses during the cooling process. Since it evaporates over time and forms a large number of poids in the insulator, it has the disadvantage of significantly reducing the treeing resistance and water immersion charging characteristics of the insulated cable. Furthermore, since it is difficult to increase the pressure applied during crosslinking, it is difficult to expect much improvement in electrical properties.
このような不利を除去するため、本発明者はさ
きにシリコーン油を加熱・冷却媒体として充填し
た架橋剤と冷却部とを区分し、各々を別個の強制
循環系として形成させ、冷却部端に急冷可能なダ
イスを設け、ここに通過するコアーとの間隙を急
冷により粘度の増大した前記冷却媒体によつてシ
ールするようにしたケーブルの製造装置（特願昭
49−12364）を提案し、これによつて所期の目的
を達成することができた。 In order to eliminate such disadvantages, the present inventor first separated the crosslinking agent filled with silicone oil as a heating/cooling medium and the cooling section, formed each as a separate forced circulation system, and installed a cooling section at the end of the cooling section. A cable manufacturing device is provided with a die capable of rapid cooling, and the gap between the die and the core passing through the die is sealed by the cooling medium whose viscosity has increased due to rapid cooling (patent application).
49-12364) and was able to achieve the intended purpose.
本発明はこれをさらに改良して架橋剤の加圧力
を大巾に増大できる装置を提供するものである。
すなわち本発明の装置は、シリコーン油等を加
熱・冷却媒体として充填し、それぞれを強制循環
させる架橋筒において、架橋筒冷却部の筒径を可
及的に細くし、前記冷却媒体の循環方向を高温側
から低温シール側に向け該循環系に冷却媒体の粘
度を増大させる程度の低温保持装置を設けたこと
を特徴とするものである。 The present invention further improves this and provides an apparatus that can significantly increase the pressing force of the crosslinking agent.
That is, the device of the present invention is a cross-linked cylinder filled with silicone oil or the like as a heating/cooling medium and forcibly circulated. It is characterized in that a low temperature holding device is provided in the circulation system from the high temperature side to the low temperature seal side to increase the viscosity of the cooling medium.
以下これを図について説明すると、心線１は押
出機ヘツド２を通過して、その表面にポリエチレ
ン絶縁被覆層３が設けられ連続的に架橋筒４内へ
送入される。架橋筒４は加熱媒体５が充填された
加熱部６と冷却媒体７が充填された冷却部８から
なり、加熱・冷却媒体としては、シリコーン油が
用いられる。 This will be explained below with reference to the drawings. A core wire 1 passes through an extruder head 2, a polyethylene insulation coating layer 3 is provided on its surface, and is continuously fed into a crosslinking tube 4. The bridge cylinder 4 consists of a heating section 6 filled with a heating medium 5 and a cooling section 8 filled with a cooling medium 7, and silicone oil is used as the heating/cooling medium.
加熱部６と冷却部８とは別個に強制循環系を形
成し、加熱媒体５はポンプ９により加熱部６内を
矢印方向に、冷却媒体７は冷凍機１０によつて冷
却され、ポンプ１１によつて冷却部８内を矢印方
向に循環する。 The heating section 6 and the cooling section 8 form a separate forced circulation system, and the heating medium 5 is cooled by a pump 9 inside the heating section 6 in the direction of the arrow, and the cooling medium 7 is cooled by a refrigerator 10 and then sent to the pump 11. Therefore, it circulates within the cooling section 8 in the direction of the arrow.
加熱部６内へ連続的に送入されたコア１２は約
250℃に加熱されて架橋化し、冷却部８で−10℃
〜−30℃に冷却されシール１３を通過してドラム
（図示せず）に巻取られる。 The core 12 continuously fed into the heating section 6 is approximately
Heated to 250℃ to crosslink, cooled to -10℃ in cooling section 8
It is cooled to -30°C, passes through a seal 13, and is wound onto a drum (not shown).
冷却媒体の循環は、従来低温シール側から高温
部に向つて行われていたが、本発明の装置はこれ
とは逆に冷却媒体を高温側から低温シール側に流
すとともに冷凍機を用いて冷却媒体を−10℃〜−
30℃の低温に保持させ、冷却筒径を出来る限り細
めて冷却筒中の圧力降下を最大に高め高温部のそ
の圧力シールを冷却筒全体で行わせたものであ
る。 Conventionally, the cooling medium was circulated from the low-temperature seal side to the high-temperature seal side, but the device of the present invention conversely circulates the cooling medium from the high-temperature side to the low-temperature seal side, and uses a refrigerator to cool it. Medium at -10℃~-
The cooling cylinder is kept at a low temperature of 30°C, the diameter of the cooling cylinder is made as narrow as possible to maximize the pressure drop in the cooling cylinder, and the pressure seal in the high temperature section is performed throughout the cooling cylinder.
本発明の装置によれば、低温にされたシリコー
ン油の粘度が上昇し、冷却部管内の圧力降下が飛
躍的に増大する。この場合配管１４の径を冷却筒
なみにしてその部分の油圧降下を少なくする。こ
のようにすると加熱部における高温シリコーン油
にかかる圧力を大幅に増大できる。なお、冷却部
管内の冷却媒体は粘度上昇により圧力降下し、低
温シール側で数気圧程度の軽いシールでも高温部
の高圧力の完全なシールが行われる。また、本発
明の装置では、冷却媒体の循環系に冷凍機等の低
温保持装置を用いて冷却温度を低下させることに
より製造速度を従来よりも上げることができる。
この場合、架橋圧力の上昇によつてカテナリー保
持の問題が発生するが、これは高周波誘導加熱を
併用する等してカテナリー部分を短尺化すれば解
決する問題である。 According to the apparatus of the present invention, the viscosity of the silicone oil that has been brought to a low temperature increases, and the pressure drop within the cooling section pipe increases dramatically. In this case, the diameter of the pipe 14 is made equal to the cooling cylinder to reduce the oil pressure drop in that part. In this way, the pressure applied to the high temperature silicone oil in the heating section can be significantly increased. Note that the pressure of the cooling medium in the cooling section pipe decreases due to the increase in viscosity, and even a light seal of several atmospheres on the low-temperature sealing side can completely seal the high pressure of the high-temperature section. Further, in the apparatus of the present invention, the production speed can be increased compared to the conventional method by lowering the cooling temperature by using a low temperature holding device such as a refrigerator in the cooling medium circulation system.
In this case, the problem of catenary retention occurs due to the increase in crosslinking pressure, but this problem can be solved by shortening the catenary portion by, for example, using high-frequency induction heating.
本発明の装置は上記構成と効果をもつため、電
気特性の優れた架橋ポリエチレン絶縁ケーブルの
製造に好適である。 Since the apparatus of the present invention has the above configuration and effects, it is suitable for manufacturing crosslinked polyethylene insulated cables with excellent electrical properties.
図は本発明装置の一例を示す概略断面説明図で
ある。
１……心線、２……押出機ヘツド、３……絶縁
被覆層、４……架橋筒、５……加熱媒体、６……
加熱部、７……冷却媒体、８……冷却部、９，１
１……ポンプ、１０……冷凍機、１２……コア
ー、１３……シール、１４……配管。
The figure is a schematic cross-sectional explanatory view showing an example of the device of the present invention. DESCRIPTION OF SYMBOLS 1... Cord wire, 2... Extruder head, 3... Insulating coating layer, 4... Crosslinked cylinder, 5... Heating medium, 6...
Heating section, 7... Cooling medium, 8... Cooling section, 9, 1
1... Pump, 10... Refrigerator, 12... Core, 13... Seal, 14... Piping.
Claims (1)
し、それぞれを強制循環させる架橋筒において、
架橋筒冷却部の筒径を可及的に細くし、前記冷却
媒体の循環方向を高温側から低温シール側に向け
該循環系に冷却媒体の粘度を増大させる程度の低
温保持装置を設けたことを特徴とする架橋ポリオ
レフイン絶縁ケーブルの製造装置。1 In a cross-linked cylinder filled with silicone oil etc. as a heating/cooling medium and forced to circulate each,
The cylinder diameter of the bridging cylinder cooling section is made as thin as possible, and the circulating direction of the cooling medium is directed from the high-temperature side to the low-temperature sealing side, and a low-temperature holding device is installed in the circulation system to increase the viscosity of the cooling medium. A manufacturing device for cross-linked polyolefin insulated cables.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7536679A JPS55166809A (en) | 1979-06-15 | 1979-06-15 | Apparatus for manufacturing crosslinked polyolefin insulated cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7536679A JPS55166809A (en) | 1979-06-15 | 1979-06-15 | Apparatus for manufacturing crosslinked polyolefin insulated cable |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS55166809A JPS55166809A (en) | 1980-12-26 |
| JPS6350806B2 true JPS6350806B2 (en) | 1988-10-12 |
Family
ID=13574142
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7536679A Granted JPS55166809A (en) | 1979-06-15 | 1979-06-15 | Apparatus for manufacturing crosslinked polyolefin insulated cable |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS55166809A (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5233314B2 (en) * | 1974-01-30 | 1977-08-27 | ||
| JPS589529B2 (en) * | 1976-11-30 | 1983-02-21 | 株式会社フジクラ | Dry crosslinking equipment for crosslinked polyethylene cables |
-
1979
- 1979-06-15 JP JP7536679A patent/JPS55166809A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS55166809A (en) | 1980-12-26 |
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