JPH0120047B2 - - Google Patents
Info
- Publication number
- JPH0120047B2 JPH0120047B2 JP57217635A JP21763582A JPH0120047B2 JP H0120047 B2 JPH0120047 B2 JP H0120047B2 JP 57217635 A JP57217635 A JP 57217635A JP 21763582 A JP21763582 A JP 21763582A JP H0120047 B2 JPH0120047 B2 JP H0120047B2
- Authority
- JP
- Japan
- Prior art keywords
- plastic
- rubber
- pipe
- mandrel
- heat
- 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
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
- B29C61/00—Shaping by liberation of internal stresses; Making preforms having internal stresses; Apparatus therefor
- B29C61/06—Making preforms having internal stresses, e.g. plastic memory
- B29C61/08—Making preforms having internal stresses, e.g. plastic memory by stretching tubes
Landscapes
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
- Cable Accessories (AREA)
Description
【発明の詳細な説明】
たとえば３〜66kV級の電力ケーブルの接続部
の補強絶縁体に、熱収縮チユーブを使つて作業能
率の向上をはかるという場合がある。DETAILED DESCRIPTION OF THE INVENTION For example, heat-shrinkable tubes are sometimes used as reinforcing insulators at the connection parts of power cables of 3 to 66 kV class in order to improve work efficiency.
この発明は、主としてそのような場合に使用す
る、絶縁性能のよい、厚肉タイプの熱収縮チユー
ブの製造方法に関するものである。 The present invention mainly relates to a method of manufacturing a thick-walled heat-shrinkable tube with good insulation performance, which is mainly used in such cases.
従来技術
たとえば「第１図」のように、押出し機１０か
らゴムまたはプラスチツク１２ａをパイプ状に押
出し、その中に高圧空気１４を入れてふくらま
せ、冷却環１６によつて冷却させるというものが
ある。Prior Art For example, as shown in FIG. 1, there is a technique in which rubber or plastic 12a is extruded from an extruder 10 into a pipe shape, high-pressure air 14 is introduced into the pipe to inflate it, and the pipe is cooled by a cooling ring 16.
しかし、この方法では、ゴムまたはプラスチツ
ク１２ａを加熱、加圧、架橋して、絶縁性能のよ
い熱収縮チユーブ１２を作ることはむずかしい。 However, with this method, it is difficult to heat, pressurize, and crosslink the rubber or plastic 12a to produce a heat-shrinkable tube 12 with good insulation performance.
これに対して、「第２図」のように、押出し機
１０に心金１８と架橋筒２０とを直結し（ただし
心金１８は順次送り出してもよい）、心金１８上
未架橋のゴムまたはプラスチツク１２ａを押出
し、加熱部２００において加熱、加圧、架橋し、
冷却部２０２において高圧の水などによつて冷却
し、そののち心金１８を引き抜いてゴムまたはプ
ラスチツク１２ａをふくらませるという方法もあ
る（特願昭57−154341）。 On the other hand, as shown in "Fig. 2", the mandrel 18 and the crosslinking cylinder 20 are directly connected to the extruder 10 (however, the mandrel 18 may be sent out sequentially), and the uncrosslinked rubber on the mandrel 18 is Alternatively, the plastic 12a is extruded, heated, pressurized, and crosslinked in the heating section 200,
There is also a method of cooling with high-pressure water in the cooling section 202, and then pulling out the core 18 and inflating the rubber or plastic 12a (Japanese Patent Application No. 57-154341).
この方法により、ボイドの非常に少ない、絶縁
性能のすぐれた熱収縮チユーブ１２を作ることが
できる。しかし熱収縮チユーブ１２があまり長く
なると、心金１８を引き抜くことができなくなる
という問題がある。 By this method, a heat-shrinkable tube 12 with very few voids and excellent insulation performance can be produced. However, if the heat-shrinkable tube 12 becomes too long, there is a problem that the mandrel 18 cannot be pulled out.
発明の目的と構成
この発明は、上記の問題を解決し、絶縁性能が
よくて、しかも長尺の熱収縮チユーブを作ること
のできる方法の提供を目的とする。Object and Structure of the Invention The object of the present invention is to solve the above-mentioned problems and provide a method that can produce a long heat-shrinkable tube with good insulation performance.
そして特徴とするところは（第３、第４図参
照）、
(1) まず、たとえば第２図と同じように、心金１
８上にゴムまたはプラスチツク１２ａを押出し
成形すること、
(2) その、心金１８上にゴムまたはプラスチツク
１２ａを押出したものを、パイプ２２内に挿入
し、ゴムまたはプラスチツク１２ａを加熱する
とともに、ゴムまたはプラスチツク１２ａと心
金１８との間に高圧空気を吹き込んで、ゴムま
たはプラスチツク１２ａをふくらませ、そのの
ち冷却して熱収縮チユーブ１２を作ること、
にある。 The characteristics are as follows (see Figures 3 and 4): (1) First, as in Figure 2, the core
(2) The rubber or plastic 12a extruded onto the mandrel 18 is inserted into the pipe 22, the rubber or plastic 12a is heated, and the rubber or plastic 12a is extruded. Alternatively, high-pressure air is blown between the plastic 12a and the mandrel 18 to inflate the rubber or plastic 12a, which is then cooled to form the heat-shrinkable tube 12.
構成の詳しい説明
「第３図」と「第４図」において、２２はパイ
プである。その内径は、希望する太さまでふくら
ませた時の熱収縮チユーブ１２の外径に等しくし
てある（ただしこのことは、この発明の必須要件
ではない）。またこの材質はステンレス管、銅管
などの金属管である。またこのパイプ２２は適当
なヒータ（図示省略）を内蔵するか、またはパイ
プへの直接通電により発熱するとともに、冷却水
２４などを内部に流せるようにしてあつて、加熱
と冷却の両方の機能を備えている。Detailed explanation of the structure In "Fig. 3" and "Fig. 4", 22 is a pipe. Its inner diameter is equal to the outer diameter of the heat-shrinkable tube 12 when inflated to the desired thickness (although this is not an essential requirement of the present invention). Moreover, this material is a metal tube such as a stainless steel tube or a copper tube. In addition, this pipe 22 has a built-in suitable heater (not shown) or is designed to generate heat by directly applying electricity to the pipe and to allow cooling water 24 or the like to flow inside, so that it has both heating and cooling functions. We are prepared.
また２６は、高圧空気を送り込むために使うパ
イプである。これは内径が心金１８より少し太い
程度のもので、先端２６０がとがらしてある。 Further, 26 is a pipe used to send high-pressure air. This has an inner diameter slightly thicker than the mandrel 18, and has a sharpened tip 260.
以上のパイプ２２とパイプ２６とが、特にこの
発明の実施に必要なものである。次に製造方法を
工程順に説明する。 The pipe 22 and pipe 26 described above are particularly necessary for carrying out the present invention. Next, the manufacturing method will be explained step by step.
(1) まず、たとえば「第２図」の場合と同じよう
に、心金１８上に未架橋のゴムまたはプラスチ
ツク１２ａを押出し、架橋筒２０内において、
加熱、加圧、架橋し、かつ冷却する。(1) First, as in the case of "Fig. 2", uncrosslinked rubber or plastic 12a is extruded onto the mandrel 18, and placed in the crosslinking tube 20.
Heat, pressurize, crosslink, and cool.
(2) 次に、「第３図」のように、パイプ２６のと
がつた先端２６０をゴムまたはプラスチツク１
２ａの一端と心金１８との間に差し込み、かつ
ゴムまたはプラスチツク１２ａとの間をシール
２８する。またパイプ２６と心金１８との間も
シール３０する。またゴムまたはプラスチツク
１２ａの反対側においても、シール金具３２を
かぶせておいてシール３４、シール３６をす
る。(2) Next, as shown in "Figure 3", attach the pointed end 260 of the pipe 26 to a piece of rubber or plastic.
It is inserted between one end of 2a and the mandrel 18, and a seal 28 is made between the rubber or plastic 12a. A seal 30 is also provided between the pipe 26 and the mandrel 18. Also, on the opposite side of the rubber or plastic 12a, a sealing fitting 32 is placed over the rubber or plastic 12a, and a seal 34 and a seal 36 are applied.
(3) 以上の準備をしたゴムまたはプラスチツク１
２ａを、心金１８ごと上記のパイプ２２内に入
れ、心金１８がちようどパイプ２２の中心軸に
くるようにして、適当手段（図示省略）によつ
て支持する。そしてまずパイプ２２を加熱装置
として動作させて、ゴムまたはプラスチツク１
２ａを加熱し、適温になつたところで、パイプ
２６を通してゴムまたはプラスチツク１２ａ内
に高圧空気３８を吹き込み、ゴムまたはプラス
チツク１２ａをふくらませる。ゴムまたはプラ
スチツク１２ａはパイプ２２の内面に接すると
ころまでふくらむから外径が均一になる。(3) Rubber or plastic prepared as above 1
2a, together with the mandrel 18, are placed in the pipe 22, and the mandrel 18 is aligned with the central axis of the pipe 22, and supported by suitable means (not shown). First, the pipe 22 is operated as a heating device to heat the rubber or plastic 1.
2a is heated, and when it reaches an appropriate temperature, high pressure air 38 is blown into the rubber or plastic 12a through the pipe 26 to inflate the rubber or plastic 12a. The rubber or plastic 12a swells to the point where it touches the inner surface of the pipe 22, so the outer diameter becomes uniform.
(4) そののち、こんどパイプ２２を冷却装置とし
て動作させ、ゴムまたはプラスチツク１２ａを
冷却し、その後心金１８と分離して熱収縮チユ
ーブ１２とする。(4) After that, the pipe 22 is operated as a cooling device to cool the rubber or plastic 12a, and then separated from the core metal 18 to form the heat-shrinkable tube 12.
発明の効果
(1) ゴムまたはプラスチツク１２ａを心金１８上
に押出成形するので、電子線照射では架橋でき
ないほど肉厚の厚い場合でも、心金１８を利用
して、加熱加圧による架橋をすることができ
る。Effects of the invention (1) Since the rubber or plastic 12a is extruded onto the mandrel 18, even if the material is too thick to be crosslinked by electron beam irradiation, the mandrel 18 can be used to crosslink by heating and pressing. be able to.
(2) ゴムまたはプラスチツク１２ａを加熱すると
ともに、前記ゴムまたはプラスチツク１２ａの
端部から当該ゴムまたはプラスチツク１２ａと
心金１８との間に高圧空気３８を吹き込むの
で、ゴムまたはプラスチツク１２ａは、端の方
から順次にふくらんでゆく（全長にわたつて同
時にふくらむのではなく）。(2) Since the rubber or plastic 12a is heated and high-pressure air 38 is blown between the rubber or plastic 12a and the mandrel 18 from the end of the rubber or plastic 12a, the rubber or plastic 12a is heated toward the end. It swells sequentially from the beginning (instead of bulging all at once over the entire length).
したがつて、肉厚が非常に厚い場合でも、部
分的な厚みのムラができずに、均一な厚みにふ
くらむことができる。 Therefore, even if the wall thickness is very thick, it can be expanded to a uniform thickness without any local unevenness in thickness.
これに反して、たとえば多数の孔のあいた中
空パイプの内側から高圧空気を吹きだすなどの
方法によつて（特開昭57−165210号公報参照）、
全長にわたつていつぺんにふくらませると、肉
厚の薄い場合は問題ないが、厚い場合は、どう
しても部分的（円周方向と長さ方向の両方）に
厚みが不均一になりやすい。 On the other hand, for example, by blowing out high-pressure air from the inside of a hollow pipe with many holes (see Japanese Patent Application Laid-open No. 165210/1983),
If the wall is inflated uniformly over the entire length, there is no problem if the wall is thin, but if it is thick, the thickness tends to become uneven in some areas (both circumferentially and lengthwise).
(3) したがつて、上記の(1)と(2)とあいまつて、電
力ケーブル接続部の補強絶縁に使用できる、厚
肉タイプでかつ絶縁性能のよい熱収縮チユーブ
が得られる。(3) Therefore, in combination with the above (1) and (2), it is possible to obtain a thick-walled heat-shrinkable tube with good insulation performance that can be used for reinforcing insulation of power cable connection parts.
第１図と第２図は、従来技術の説明図、第３図
と第４図は、この発明の一つの実施態様を工程の
順に示した説明図。
１０：押出し機、１２：熱収縮チユーブ、１２
ａ：ゴムまたはプラスチツク、２０：架橋筒、２
６：パイプ、３８：高圧空気。
FIGS. 1 and 2 are explanatory diagrams of the prior art, and FIGS. 3 and 4 are explanatory diagrams showing one embodiment of the present invention in the order of steps. 10: Extruder, 12: Heat shrink tube, 12
a: rubber or plastic, 20: crosslinked tube, 2
6: Pipe, 38: High pressure air.
Claims (1)
に心金１８上に押出成形し；その、心金１８上に
ゴムまたはプラスチツク１２ａを押出したもの
を、パイプ２２内に挿入し；前記ゴムまたはプラ
スチツク１２ａを加熱するとともに、前記ゴムま
たはプラスチツク１２ａの端部から当該ゴムまた
はプラスチツク１２ａと心金１８との間に高圧空
気３８を吹き込んで、ゴムまたはプラスチツク１
２ａをふくらませ、そののち冷却すること；を特
徴とする熱収縮チユーブの製造方法。 ２ パイプ２２が加熱ならびに冷却の機能を持つ
ているものであつて、そのパイプ２２によつて、
ゴムまたはプラスチツク１２ａの加熱ならびに冷
却を行うこと、を特徴とする特許請求の範囲第１
項に記載の熱収縮チユーブの製造方法。[Claims] 1. Rubber or plastic 12a is extruded to a certain thickness onto a mandrel 18; the rubber or plastic 12a extruded onto the mandrel 18 is inserted into a pipe 22; The rubber or plastic 12a is heated and high-pressure air 38 is blown between the rubber or plastic 12a and the mandrel 18 from the end of the rubber or plastic 12a.
A method for producing a heat-shrinkable tube, comprising: inflating 2a and then cooling it. 2. The pipe 22 has heating and cooling functions, and the pipe 22
Claim 1 characterized in that the rubber or plastic 12a is heated and cooled.
A method for manufacturing a heat shrinkable tube as described in Section 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21763582A JPS59106920A (en) | 1982-12-11 | 1982-12-11 | Preparation of thermally shrinkable tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21763582A JPS59106920A (en) | 1982-12-11 | 1982-12-11 | Preparation of thermally shrinkable tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59106920A JPS59106920A (en) | 1984-06-20 |
| JPH0120047B2 true JPH0120047B2 (en) | 1989-04-14 |
Family
ID=16707352
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21763582A Granted JPS59106920A (en) | 1982-12-11 | 1982-12-11 | Preparation of thermally shrinkable tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59106920A (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55142610A (en) * | 1979-04-24 | 1980-11-07 | Fujikura Ltd | Production of thermal contraction pipe |
| JPS57165210A (en) * | 1981-04-06 | 1982-10-12 | Showa Electric Wire & Cable Co Ltd | Manufacture of thermally shrinkable tube |
-
1982
- 1982-12-11 JP JP21763582A patent/JPS59106920A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59106920A (en) | 1984-06-20 |
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