JPS6321127A - Continuous manufacture of crosslinked heat-shrinkable tube - Google Patents

Continuous manufacture of crosslinked heat-shrinkable tube

Info

Publication number
JPS6321127A
JPS6321127A JP61165929A JP16592986A JPS6321127A JP S6321127 A JPS6321127 A JP S6321127A JP 61165929 A JP61165929 A JP 61165929A JP 16592986 A JP16592986 A JP 16592986A JP S6321127 A JPS6321127 A JP S6321127A
Authority
JP
Japan
Prior art keywords
tube
crosslinking
extruded
resin
mandrel
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.)
Granted
Application number
JP61165929A
Other languages
Japanese (ja)
Other versions
JPH0351210B2 (en
Inventor
Akishi Onishi
晃史 大西
Michio Takaoka
道雄 高岡
Tsuneaki Motai
恒明 馬渡
Shotaro Yoshida
昭太郎 吉田
Shoichi Hasegawa
正一 長谷川
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.)
Fujikura Ltd
Original Assignee
Fujikura 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 Fujikura Ltd filed Critical Fujikura Ltd
Priority to JP61165929A priority Critical patent/JPS6321127A/en
Publication of JPS6321127A publication Critical patent/JPS6321127A/en
Publication of JPH0351210B2 publication Critical patent/JPH0351210B2/ja
Granted legal-status Critical Current

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  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)

Abstract

PURPOSE:To prevent resin in a crosslinking tube from seizing without using lubricating oil by a method wherein the resin is extruded into the crosslinking tube in the form of a tube while an extruder die and a mandrel are vibratingly reciprocated in extrusion direction. CONSTITUTION:Uncrosslinked resin 15 is extruded through a resin passage 4 from an extrusion port 3 into a crosslinking tube 7 in the form of a hollow tube. Pressure fluid is blasted from a pressure fluid feeding passage 6 to the inner surface side of the extruded tube 5. In addition, the reciprocative vibration in extrusion direction is given to an extruder die 1 and a mandrel 2 with a vibrator 9. The tube 5 extruded in the crosslinking tube 7 lowers in the crosslinking tube 7 and is subjected to crosslinking by heating during its lowering movement. At this time, the tube 5 tends to bring into contact with the inner surface of the crosslinking tube 7 by pressure. However, vibration is given to the tube 5 relative to the inner surface of the crosslinking tube 7 owing to the vibration given to the extruder die 1 and the mandrel 2, resulting in smoothly lowering the tube 5 with no seizure to the inner surface of the crosslinking tube 7. In succession, the tube 5 is stretched along the inner surface 10A of a divergent die 10 and, after that, cooled down near to room temperature in a cooling tubular body 1 in order to obtain a heat-shrinkable tube.

Description

【発明の詳細な説明】 産業上の利用分野 この発明は各種配管やケーブルの接続部、その他各種の
管や棒の防食あるいは保温などのための被覆に使用され
る熱収縮管の製造方法に関し、特に架橋型樹脂を使用し
た熱収縮管を連続的に製造する方法に関するものである
[Detailed Description of the Invention] Industrial Application Field This invention relates to a method of manufacturing heat shrinkable tubes used for coating various piping and cable connections, and other various types of tubes and rods for corrosion protection or heat retention. In particular, it relates to a method for continuously manufacturing heat-shrinkable tubes using crosslinked resin.

従来の技術 従来から、石油、ガス、水Jciるいは化学プラント等
のライニング鋼管の接続部や、電カケープルあるいは通
信ケーブルの保護鋼管の接続部などの防食や保温には、
加熱によって収縮してその接続部などを密着状態で被覆
することができる熱収縮管を用いることが行なわれてい
る。このような熱収縮管には各種の合成樹脂が用いられ
ているが、最近では架橋ポリエチレンなどの架橋型合成
樹脂を使用することが多い。
Conventional Technology Traditionally, there have been various methods for corrosion protection and heat insulation of the joints of lining steel pipes in oil, gas, water, JCI, chemical plants, etc., and the joints of protective steel pipes of electric power cables and communication cables.
Heat-shrinkable tubes, which can be shrunk by heating to tightly cover the connecting portions, have been used. Various synthetic resins are used for such heat-shrinkable tubes, but recently cross-linked synthetic resins such as cross-linked polyethylene are often used.

ところで架橋型熱収縮管を連続的に製造する方法として
は、特公昭47−19356号公報記載の方法が知られ
ている。この方法は、管壁に多数の貫通小孔を形成した
アルミニウム管等の金属管上に未架橋の樹脂コンパウン
ドを押出被覆した後、その被覆された管を架橋室、膨張
苗および冷却苗に連続的に通過させ、架橋室において架
、矯した後、前記膨張至において管の内外圧を制御して
金属管上の樹脂チューブを膨張させて、その膨張状態の
まま冷却至で冷却させ、巻取る方法である。
By the way, as a method for continuously manufacturing cross-linked heat-shrinkable tubes, a method described in Japanese Patent Publication No. 19356/1983 is known. In this method, an uncrosslinked resin compound is extruded and coated onto a metal tube such as an aluminum tube with many small through holes formed in the tube wall, and then the coated tube is continuously placed in a crosslinking chamber, expanded seedlings, and cooled seedlings. After being stretched and straightened in a cross-linking chamber, the resin tube on the metal tube is expanded by controlling the internal and external pressure of the tube in the expansion stage, and the resin tube is cooled in the expanded state in a cooling stage and wound up. It's a method.

発明が解決すべき問題点 前述の従来方法は、金属管をコアとして用いてその金属
管上に樹脂を押出被覆するものでおるから、最終的に金
属管を後き取る必要があり、そのため作業性が低くなら
ざるを得ず、また金属管を用いるために高コストとなり
、さらには金属管を内挿したまま巻取ることが実際上は
困難でおることが多く、したがってこの方法は非現実的
であって実際に架橋型熱収縮管の連続的な製造に適用す
ることは困難であった。
Problems to be Solved by the Invention The above-mentioned conventional method uses a metal tube as a core and extrusion coats resin onto the metal tube, so it is necessary to remove the metal tube afterwards, which requires a lot of work. In addition, the use of a metal tube increases the cost, and furthermore, it is often difficult to wind the metal tube with the metal tube inserted, so this method is impractical. However, it has been difficult to actually apply it to the continuous production of cross-linked heat-shrinkable tubes.

一方、一般の架橋型樹脂からなる管を製造するために、
未架橋の樹脂を管状に押出してこれを架橋筒内で連続的
に加熱架橋する場合、押出された管と架橋筒内面との間
の摩擦を軽減して樹脂の焼付きを防止することを目的と
して、その間に潤滑油を供給することが行なわれている
が、ある種の潤滑油ではその潤滑油中に含まれている成
分が樹脂中の架橋剤と反応して潤滑効果が得られなくな
つたり、おるいは潤滑油中の成分が樹脂を劣化させたり
することがおるという問題があった。また潤滑油を用い
る場合、栗矯簡の内面の全面に潤滑油が充分に行き渡ら
ず、いわゆる油切れを起こして焼付きが発生してしまう
ことも必り、さらには潤滑油の管理も必要となるから、
潤滑油を用いずに架橋時の焼付きを防止し得る方法が強
く望まれている。
On the other hand, in order to manufacture pipes made of general cross-linked resin,
When extruding uncrosslinked resin into a tube and continuously heating and crosslinking it in a crosslinking cylinder, the purpose is to reduce friction between the extruded tube and the inner surface of the crosslinking cylinder to prevent resin seizure. However, with some types of lubricating oil, the components contained in the lubricating oil react with the crosslinking agent in the resin, making it impossible to obtain a lubricating effect. There is a problem in that the components in the lubricating oil may deteriorate the resin. Furthermore, when lubricating oil is used, the lubricating oil is not sufficiently distributed over the entire inner surface of the chestnut paper, which inevitably causes so-called oil depletion and seizure, and furthermore, the lubricating oil must be managed. Because it will be,
There is a strong desire for a method that can prevent seizure during crosslinking without using lubricating oil.

この発明は以上の事情を背景としてなされたもので、上
述の金属管をコアとして用いた場合のような諸問題を招
くことなく、実際に架橋型熱収縮管を低コスト、高作業
性で連続的に製造することができ、しかも特に潤滑油を
用いずに架橋筒内における樹脂の焼付きを防止すること
ができる方法を提供することを目的とするものである。
This invention was made against the background of the above circumstances, and it is possible to produce cross-linked heat-shrinkable tubes continuously at low cost and with high workability, without causing the problems described above when using metal tubes as cores. The object of the present invention is to provide a method that can be manufactured in a cost-effective manner and that can prevent the resin from seizing inside the crosslinked cylinder without particularly using lubricating oil.

問題点を解決するための手段 この発明の架橋型熱収縮管の連続製造方法は、架橋型熱
収縮管の素材となる未架橋の樹脂を押出用ダイスとマン
ドレルとの間から架橋筒内へ中空管状に連続的に押出す
とともに、その押出しにあたって前記押出用ダイスおよ
びマンドレルを押出方向に往復振動させ、かつ押出され
た管の内面側に圧力流体を連続的に吹込み、さらに押出
された管を架橋筒の出口からテーパー状に拡大する内面
を有する拡径ダイス内へ連続的に導き、続いてその拡径
ダイスの拡大端部から冷却筒内へ連続的に導くことを特
徴とするものである。
Means for Solving the Problems The continuous manufacturing method of cross-linked heat-shrinkable tubes of the present invention involves hollowing uncrosslinked resin, which is a material for cross-linked heat-shrinkable tubes, from between an extrusion die and a mandrel into a cross-linked tube. In addition to continuously extruding the extruded tube, the extrusion die and mandrel are vibrated reciprocally in the extrusion direction, and pressure fluid is continuously blown into the inner surface of the extruded tube. It is characterized in that it is continuously guided from the outlet of the bridging cylinder into a diameter-expanding die having an inner surface that expands in a tapered shape, and then continuously guided into the cooling cylinder from the enlarged end of the diameter-expanding die. .

作   用 架橋型熱収縮管の素材となる未架橋の樹脂は、押出用ダ
イスとマンドレルとの間から架橋筒内へ中空管状に連続
的に押出されて、その架橋筒内で連続的に加熱架橋され
、続いてその架橋された管は架橋筒からテーパー状に拡
大する内面を有する拡径ダイス内に連続的に導かれ、さ
らにその拡径ダイスの拡大端部から冷却筒内へ連続的に
導かれる。ここで、押出された管の内面側には圧力流体
が吹込まれるから、架橋筒体で架橋された管は未だ低温
とならないうちに拡径ダイス内において流体圧力によっ
て拡径ダイスのテーパー状に拡大する内面に沿って拡径
され、続いてその拡径された状態で冷却筒内において連
続的に冷却されて、熱収縮管が得られる。
Function: The uncrosslinked resin that is the material for the crosslinked heat-shrinkable tube is continuously extruded into a hollow tube shape from between the extrusion die and the mandrel into the crosslinking cylinder, and is continuously heated and crosslinked within the crosslinking cylinder. The cross-linked tube is then continuously guided from the cross-linked tube into a diameter expanding die having a tapered inner surface, and then continuously guided from the enlarged end of the diameter expanding die into the cooling tube. It will be destroyed. Here, since pressure fluid is blown into the inner surface of the extruded tube, the tube crosslinked with the crosslinked cylinder is shaped into a tapered shape by the fluid pressure in the diameter expansion die before it reaches a low temperature. The diameter is expanded along the expanding inner surface, and then the expanded diameter is continuously cooled in the cooling cylinder to obtain a heat-shrinkable tube.

そして特にこの発明の方法では、押出用ダイスおよびマ
ンドレルが押出方向に往復(騒動せしめられつつ、押出
用ダイスとマンドレルの間から架橋筒内へ樹脂が管状に
押出されるから、その押出された管と架橋筒内面との間
にも相対的な振動が与えられ、その振動によって押出さ
れた管の樹脂が架橋筒内面に焼付くことが防止される。
In particular, in the method of the present invention, the extrusion die and mandrel are reciprocated in the extrusion direction, and the resin is extruded into the crosslinking cylinder from between the extrusion die and the mandrel in a tubular shape. Relative vibration is also applied between the tube and the inner surface of the cross-linked cylinder, and the vibration prevents the extruded resin from burning on the inner surface of the cross-linked cylinder.

すなわち、架橋型樹脂からなる管を連続製造する場合1
、樹脂は架橋筒内面との間で焼付きを生じ易く、また特
にこの発明の方法のように押出された管の内面側に圧力
流体を吹込んでいる場合、押出された管が架橋筒内面に
押し付けられる結果、押出された管の外面と架橋筒内面
との間の摩擦抵抗が大きくなって焼付きが生じ易くなる
傾向におり、そのため押出された管の円滑な移動が困難
となって連続製造に支障を来たすおそれがおるが、押出
された管と架橋筒内面との間に相対的に振動が与えられ
ることによって、押出された管の樹脂が摩擦抵抗により
架橋筒内面の同じ位置に局部的に滞留したりまたは滞留
に近い状態となることが防止され、その結果樹脂が架橋
筒内面に焼付くことが防止されて、押出された管が円滑
に移動し、架橋された熱収縮管を支障なく連続製造する
ことができるのである。そしてこのように押出用ダイス
およびマンドレルに与える振動によって架橋筒内での焼
付きが防止されることから、特に焼付き防止のための潤
滑油を用いる必要がなくなり、潤滑油を用いた場合の不
都合、すなわち例えば同滑油の成分が架橋剤と反応した
り油切れによって焼付きが発生したりする不都合を解消
し得るのである。
In other words, when continuously manufacturing pipes made of cross-linked resin 1
The resin tends to seize with the inner surface of the cross-linked tube, and especially when pressure fluid is blown into the inner surface of the extruded tube as in the method of this invention, the resin tends to seize between the inner surface of the cross-linked tube and the extruded tube. As a result of being pressed, the frictional resistance between the outer surface of the extruded tube and the inner surface of the cross-linked tube increases, which tends to cause seizure, which makes it difficult to move the extruded tube smoothly and prevents continuous production. However, due to the relative vibration applied between the extruded pipe and the inner surface of the cross-linked cylinder, the resin in the extruded pipe may be locally localized at the same position on the inner surface of the cross-linked cylinder due to frictional resistance. As a result, the resin is prevented from burning on the inner surface of the crosslinked tube, allowing the extruded tube to move smoothly and preventing any interference with the crosslinked heat shrink tube. This allows for continuous production without any problems. In this way, the vibration applied to the extrusion die and mandrel prevents seizure within the crosslinked cylinder, so there is no need to use lubricating oil to prevent seizure, and there are disadvantages when using lubricating oil. That is, for example, it is possible to eliminate inconveniences such as the reaction of the lubricating oil components with the crosslinking agent or the occurrence of seizure due to lack of oil.

実施例 添付図面にこの発明の製造方法を実施するための装置の
一例を示す。
EXAMPLE The accompanying drawings show an example of an apparatus for carrying out the manufacturing method of the present invention.

先ず図示の装置について説明すれば、軸線が垂直となる
ように配設された全体として円筒状をなす押出用ダイス
1の内側にはマンドレル2が同心状に設けられており、
押出用ダイス1とマンドレル2との間の下部には連続環
状の押出口3が形成されている。その押出口3は樹脂通
路4を介して図示しない押出機に連絡され、その押出□
からの押出圧力によって未架橋の樹脂15が中空管状に
成形された状態で押出されるようになっている。
First, to explain the illustrated device, a mandrel 2 is provided concentrically inside an extrusion die 1 having a cylindrical shape as a whole and whose axis is perpendicular.
A continuous annular extrusion port 3 is formed at the bottom between the extrusion die 1 and the mandrel 2. The extrusion port 3 is connected to an extruder (not shown) via a resin passage 4, and the extrusion □
The uncrosslinked resin 15 is extruded in the form of a hollow tube by the extrusion pressure applied thereto.

またマンドレル2には、前記押出口3から押出された樹
脂からなる管5の内面側に外部から圧力流体を供給する
ための圧力流体供給路6が軸方向に沿って貫通形成され
ている。さらに耐記押出用ダイス1の上端には、押出用
ダイス1およびマンドレル2に押出方向く幅方向)に沿
った往復振動を与えるための加振子9が設けられている
Further, a pressurized fluid supply path 6 for supplying pressurized fluid from the outside to the inner surface side of the tube 5 made of resin extruded from the extrusion port 3 is formed through the mandrel 2 along the axial direction. Furthermore, a vibrator 9 is provided at the upper end of the recordable extrusion die 1 for imparting reciprocating vibration to the extrusion die 1 and the mandrel 2 along the extrusion direction (the width direction).

前記押出口3の押出方向前方、すなわち図における下方
には、押出口3の外径すなわち押出用ダイスの内径と実
質的に相等しい内径を有する架橋筒7が配設されており
、この架橋筒7には加熱架橋のための温度を確保するた
めのヒータ8が設けられている。
A bridge tube 7 having an inner diameter substantially equal to the outer diameter of the extrusion outlet 3, that is, the inner diameter of the extrusion die, is disposed in front of the extrusion port 3 in the extrusion direction, that is, at the bottom in the figure. 7 is provided with a heater 8 for ensuring a temperature for thermal crosslinking.

前記架橋筒7の下方には、下方へ向って径がテーパー状
に拡大する内面10Aを有する拡径ダイス10が、架橋
筒7に連結された状態で配設されており、その拡径ダイ
ス10の下端(拡大端)には、その拡径ダイス10の拡
大端の内径と相等しい内径を有する冷却筒11が、拡径
ダイス10の拡大端に連結された状態で配設されている
。なおこの冷却筒11は水冷もしくは空冷構造とされて
いる。
Below the bridging cylinder 7, a diameter expanding die 10 having an inner surface 10A whose diameter expands downward in a tapered manner is disposed in a state connected to the bridging cylinder 7. A cooling cylinder 11 having an inner diameter equal to the inner diameter of the enlarged end of the enlarged diameter die 10 is disposed at the lower end (enlarged end) of the die 10 in a state connected to the enlarged end of the enlarged diameter die 10 . Note that this cooling cylinder 11 has a water-cooled or air-cooled structure.

さらに冷却筒11の下方には、冷却筒11から下方へ垂
下する管5の断面形状を偏平に変形させる方向へ案内す
るためのガイド12が設けられており、かつそのガイド
12の下側には、ガイド12により偏平に変形された管
5をさらに両側から圧接するための一対の圧接ローラ1
3が配設されている。なおその圧接ローラ13の下方も
しくは側方には図示しない巻取ローラが設けられている
Furthermore, a guide 12 is provided below the cooling cylinder 11 for guiding the tube 5 hanging downward from the cooling cylinder 11 in a direction that flattens the cross-sectional shape. , a pair of pressing rollers 1 for further pressing the tube 5 which has been flattened by the guide 12 from both sides.
3 are arranged. Note that a winding roller (not shown) is provided below or to the side of the pressure roller 13.

以上の装置を用いて架橋型熱収縮管、例えば架橋ポリエ
チレンからなる熱収縮管を製造する方法について次に説
明する。
Next, a method for manufacturing a crosslinked heat-shrinkable tube, for example a heat-shrinkable tube made of crosslinked polyethylene, using the above-described apparatus will be described.

図示しない押出機で混練されて押出された未架橋の樹脂
15は、樹脂通路4を経て押出用ダイス1とマンドレル
2との間の押出口3から架橋筒7内へ連続的に中空管状
に押出される。その押出された管5の内面側には、圧力
流体供給路6から好ましくは不活性ガスなどからなる圧
力流体が吹込まれる。また押出用ダイス1およびマンド
レル2には加振子9によって押出方向の往復振動が与え
られる。
The uncrosslinked resin 15 kneaded and extruded by an extruder (not shown) is continuously extruded into the crosslinking cylinder 7 through the resin passage 4 from the extrusion port 3 between the extrusion die 1 and the mandrel 2 into the crosslinking cylinder 7. be done. Pressure fluid, preferably made of an inert gas, is blown into the inner surface of the extruded tube 5 from the pressure fluid supply path 6. Further, a reciprocating vibration in the extrusion direction is applied to the extrusion die 1 and the mandrel 2 by a vibrator 9.

前述のようにして架橋筒7内に押出された未架橋の樹脂
からなる管5は、自重や圧接ローラ13の引取り回転力
さらには図示しない巻取別の巻取力等によって架橋筒7
内を下降し、その間加熱架橋が施される。この時、前記
圧力流体の加圧力によって管5は栗、連部7の内面に圧
接されようとするが、前述のように押出用ダイス1およ
びマントル2に与えられる撮動によって管5には架橋筒
7の内面に対し相対的に撮動が与えられ、したがって管
5はその樹脂が架橋筒7の内面に焼付くことなく、円滑
に下降する。
The pipe 5 made of uncrosslinked resin extruded into the cross-linked cylinder 7 as described above is pushed into the cross-linked cylinder 7 by its own weight, the take-up rotational force of the pressure roller 13, the winding force of each winding unit (not shown), etc.
During this period, thermal crosslinking is applied. At this time, the tube 5 tries to be pressed against the inner surface of the chestnut and the connecting portion 7 due to the pressurizing force of the pressure fluid, but as mentioned above, the tube 5 is cross-linked due to the motion applied to the extrusion die 1 and the mantle 2. A relative motion is applied to the inner surface of the tube 7, so that the tube 5 descends smoothly without its resin burning onto the inner surface of the bridging tube 7.

架橋された管5は続いて拡径ダイス10を通過するが、
この通過時には未だ高温となっているため、前述の圧力
流体による加圧力によって拡径ダイス10の内面10A
に沿って展伸されて、拡径される。続いてその拡径され
た管は冷却筒体11内で至温近くまで冷却され、熱収縮
管となる。この後には、ガイド12によって管5は隔平
に変形され、さらに圧接ローラ]3により両側から圧接
されて畳まれた状態となり、図示しない巻取機によって
巻取られる。また管5が上述のように圧接ローラ13に
より圧接されることによって管5の内部空間がガスシー
ルされることから、前述の圧力流体による加圧力が管5
の拡径のために有効に作用することになる。
The crosslinked tube 5 then passes through a diameter expanding die 10,
Since the temperature is still high during this passage, the inner surface 10A of the diameter-expanding die 10 is
It is stretched along and expanded in diameter. Subsequently, the diameter-expanded tube is cooled to near the lowest temperature within the cooling cylinder 11, and becomes a heat-shrinkable tube. After this, the tube 5 is deformed into a flat shape by the guide 12, and then pressed from both sides by the pressure rollers 3 into a folded state, and then wound up by a winder (not shown). Furthermore, since the internal space of the tube 5 is gas-sealed by being pressed by the pressure roller 13 as described above, the pressurizing force by the pressure fluid described above is applied to the tube 5.
This will effectively work to expand the diameter of.

なおここで、押出用ダイス1およびマンドレル2に与え
る撮動の周波数および振幅は特に限定しないが、通常は
500tlZ〜5000Hz程度の周波数で1m以下の
振幅の振動を与えれば良い。なお実際の製造装置では、
振動の周波数および/または振幅を連続的あるいは段階
的に変化させ得るように構成し、樹脂の種類や押出し管
の厚み、径、管の走行速度などに応じて最適な周波数お
よび/または振幅に調整するようにしておくことが望ま
しい。
Here, the frequency and amplitude of the imaging applied to the extrusion die 1 and the mandrel 2 are not particularly limited, but it is usually sufficient to apply vibrations with a frequency of about 500 tlZ to 5000 Hz and an amplitude of 1 m or less. In addition, in the actual manufacturing equipment,
Constructed so that the frequency and/or amplitude of vibration can be changed continuously or stepwise, and adjusted to the optimal frequency and/or amplitude depending on the type of resin, the thickness and diameter of the extruded tube, the running speed of the tube, etc. It is desirable to do so.

なおまたこの発明の方法は、基本的には潤滑油を使用せ
ずに振動のみによって焼付きを防止することができるも
のでおるが、場合によっては通切な潤滑油を選択してこ
れを併用し、焼付き防止効果を一層高めても良いことは
勿論であり、この場合は例えば架橋筒7とダイス1との
間に図示しない供給口を設け、押出された管5と架橋筒
7の内面との間に潤滑油を供給すれば良い。さらに、上
記の供給口から、不活性ガス等の気体、潤滑剤や窒化ホ
ウ素(BN)等の固体潤滑剤粉末を供給して、これらに
より焼付防止効果を一層向上させても良い。
Furthermore, although the method of the present invention is basically capable of preventing seizure by using only vibration without using lubricating oil, in some cases, a suitable lubricating oil may be selected and used in combination. Of course, it is possible to further enhance the anti-seizure effect. In this case, for example, a supply port (not shown) may be provided between the bridge tube 7 and the die 1, and the extruded tube 5 and the inner surface of the bridge tube 7 may be connected to each other. It is sufficient to supply lubricating oil between them. Further, a gas such as an inert gas, a lubricant, or a solid lubricant powder such as boron nitride (BN) may be supplied from the above-mentioned supply port to further improve the anti-seizure effect.

発明の効果 この発明の方法によれば、架橋型樹脂からなる熱収縮管
を、特に潤滑油を用いることなく架橋筒内での焼付き発
生を防止しつつ、円滑に連続製造することができ、した
がって特に長尺の熱収縮管を連続製造するに最適であり
、また上述のように潤滑油を使用しなくて済むため、潤
滑油中の成分と架橋剤との反応により樹脂が劣化したり
、焼付き防止効果か失われたりすることもなく、さらに
は油切れによって焼付きを生じてしまうおそれもない。
Effects of the Invention According to the method of the present invention, heat-shrinkable tubes made of cross-linked resin can be smoothly and continuously manufactured while preventing seizure within the cross-linked tube without particularly using lubricating oil. Therefore, it is particularly suitable for the continuous production of long heat shrinkable tubes, and as mentioned above, it does not require the use of lubricating oil, which prevents the resin from deteriorating due to the reaction between the components in the lubricating oil and the crosslinking agent. There is no loss of anti-seizure effect, and there is no risk of seizure occurring due to lack of oil.

さらにこの発明の方法は、従来の金属管上に押出被覆す
る方法と異なり、最終的に金属管を扱き取る必要もない
ため、作業性も良好でかつコストも低廉で必り、したが
って実際に量産的規模で架橋型熱収縮管の製造に適用す
ることができる。
Furthermore, unlike the conventional extrusion coating method on metal tubes, the method of the present invention does not require the final handling of the metal tubes, so it is easy to work with, and the cost is low, making it practical for mass production. It can be applied to the production of cross-linked heat shrinkable tubes on a large scale.

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

図面はこの発明の方法を実施する装置の一例を示す略解
的な縦断面図である。 1・・・押出用ダイス、 2・・・マンドレル、 3・
・・押出口、 5・・・押出された管、 6・・・圧力
流体供給路、 7・・・架橋筒、 9・・・加振子、 
]O・・・拡径ダイス、 11・・・冷却筒。
The drawing is a schematic longitudinal sectional view showing an example of an apparatus for carrying out the method of the present invention. 1... Extrusion die, 2... Mandrel, 3...
... Extrusion port, 5... Extruded pipe, 6... Pressure fluid supply path, 7... Bridge tube, 9... Oscillator,
]O... Diameter expanding die, 11... Cooling cylinder.

Claims (1)

【特許請求の範囲】[Claims] 架橋型熱収縮管の素材となる未架橋の樹脂を押出用ダイ
スとマンドレルとの間から架橋筒内へ中空管状に連続的
に押出すとともに、その押出しにあたって前記押出用ダ
イスおよびマンドレルを押出方向に往復振動させ、かつ
押出された管の内面側に圧力流体を連続的に吹込み、さ
らに押出された管を架橋筒の出口からテーパー状に拡大
する内面を有する拡径ダイス内へ連続的に導き、続いて
その拡径ダイスの拡大端部から冷却筒内へ連続的に導く
ことを特徴とする架橋型熱収縮管の連続製造方法。
The uncrosslinked resin, which is the raw material for the crosslinked heat-shrinkable tube, is continuously extruded into a hollow tube from between the extrusion die and the mandrel into the crosslinking tube, and during extrusion, the extrusion die and mandrel are moved in the extrusion direction. The extruded tube is vibrated reciprocatingly, pressure fluid is continuously blown into the inner surface of the extruded tube, and the extruded tube is continuously guided from the outlet of the bridge tube into a diameter expanding die having an inner surface that expands in a tapered shape. A continuous manufacturing method for a crosslinked heat-shrinkable tube, characterized in that the tube is then continuously guided from the enlarged end of the diameter-expanding die into the cooling cylinder.
JP61165929A 1986-07-15 1986-07-15 Continuous manufacture of crosslinked heat-shrinkable tube Granted JPS6321127A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP61165929A JPS6321127A (en) 1986-07-15 1986-07-15 Continuous manufacture of crosslinked heat-shrinkable tube

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP61165929A JPS6321127A (en) 1986-07-15 1986-07-15 Continuous manufacture of crosslinked heat-shrinkable tube

Publications (2)

Publication Number Publication Date
JPS6321127A true JPS6321127A (en) 1988-01-28
JPH0351210B2 JPH0351210B2 (en) 1991-08-06

Family

ID=15821691

Family Applications (1)

Application Number Title Priority Date Filing Date
JP61165929A Granted JPS6321127A (en) 1986-07-15 1986-07-15 Continuous manufacture of crosslinked heat-shrinkable tube

Country Status (1)

Country Link
JP (1) JPS6321127A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01171628U (en) * 1988-05-24 1989-12-05
CN110789140A (en) * 2019-09-27 2020-02-14 国网浙江嘉善县供电有限公司 Electric power lead wire pyrocondensation pipe processing and assembly quality

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01171628U (en) * 1988-05-24 1989-12-05
CN110789140A (en) * 2019-09-27 2020-02-14 国网浙江嘉善县供电有限公司 Electric power lead wire pyrocondensation pipe processing and assembly quality
CN110789140B (en) * 2019-09-27 2021-10-22 国网浙江嘉善县供电有限公司 Electric power lead wire pyrocondensation pipe processing and assembly quality

Also Published As

Publication number Publication date
JPH0351210B2 (en) 1991-08-06

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