JPH02207424A - Manufacture of forming fluorinated resin insulative wire - Google Patents
Manufacture of forming fluorinated resin insulative wireInfo
- Publication number
- JPH02207424A JPH02207424A JP1025762A JP2576289A JPH02207424A JP H02207424 A JPH02207424 A JP H02207424A JP 1025762 A JP1025762 A JP 1025762A JP 2576289 A JP2576289 A JP 2576289A JP H02207424 A JPH02207424 A JP H02207424A
- Authority
- JP
- Japan
- Prior art keywords
- stranded wire
- wire
- nipple
- foaming
- fluororesin
- 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 12
- 239000011347 resin Substances 0.000 title abstract description 7
- 229920005989 resin Polymers 0.000 title abstract description 7
- 238000005187 foaming Methods 0.000 claims abstract description 26
- 210000002445 nipple Anatomy 0.000 claims abstract description 18
- 239000004088 foaming agent Substances 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims description 12
- 239000011248 coating agent Substances 0.000 claims description 3
- 239000011247 coating layer Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 239000006260 foam Substances 0.000 abstract description 10
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 2
- 229910052782 aluminium Inorganic materials 0.000 abstract description 2
- 239000010949 copper Substances 0.000 abstract description 2
- 229910052802 copper Inorganic materials 0.000 abstract description 2
- 239000004411 aluminium Substances 0.000 abstract 1
- 239000012528 membrane Substances 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 12
- -1 polytetrafluoroethylene Polymers 0.000 description 3
- 239000004604 Blowing Agent Substances 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 238000007765 extrusion coating Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Molding Of Porous Articles (AREA)
- Processes Specially Adapted For Manufacturing Cables (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、発泡フッ素樹脂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 a foamed fluororesin insulated wire.
〔従来技術とその！ｌ！り
従来、絶縁層としてＰＴＦＥ （ポリテトラフルオロエ
チレン）等のフッ素樹脂の発泡体を使用した発泡フッ素
樹脂絶縁電線を製造するには、押出機にホッパーからベ
レット状のフッ素樹脂を供給すると共に、その押出機の
中間部からフロン（発泡剤）を定量注入し、両者を十分
混練した後、クロスヘッドから発泡剤含有フッ素樹脂を
押し出して心線上に被覆する、という方法がとられてい
る。[Conventional technology and its! l! Conventionally, in order to manufacture a foamed fluororesin insulated wire using a foamed fluororesin such as PTFE (polytetrafluoroethylene) as an insulating layer, a pellet-shaped fluororesin is supplied from a hopper to an extruder, and the A method is used in which a fixed amount of fluorocarbon (a foaming agent) is injected from the middle part of the extruder, the two are sufficiently kneaded, and then the foaming agent-containing fluororesin is extruded from a crosshead to coat the core wire.
クロスヘッドを出た発泡剤含有フッ素樹脂は、圧力が開
放されるため内部の発泡剤が膨張して発泡することにな
る。Since the pressure of the blowing agent-containing fluororesin that has exited the crosshead is released, the blowing agent inside expands and foams.
しかしフッ素樹脂はポリエチレン等に比べ融点が高く、
かつ融点付近の温度で粘度が急激に変化するため、高い
発泡率（６５％以上）を安定して得ることが困難である
０発泡率の制御は通常、クロスヘッドを出た直後の発泡
途中のフッ素樹脂被覆を水冷または空冷する際に、冷却
の程度を加減することにより行われているが（特開昭６
０−７２１１４号公報）、発泡途中のフッ素樹脂被覆を
急冷すると発泡が十分に行われず、また暖冷すると発泡
剤が抜けてしまって高い発泡率が得られず、外観も悪く
なる。However, fluororesin has a higher melting point than polyethylene etc.
In addition, since the viscosity changes rapidly at temperatures near the melting point, it is difficult to stably obtain a high foaming rate (65% or more). Controlling the foaming rate to 0 is usually done during foaming immediately after leaving the crosshead. This is done by adjusting the degree of cooling when water or air cooling the fluororesin coating (Japanese Patent Laid-Open No. 6
0-72114), if the fluororesin coating is rapidly cooled during foaming, sufficient foaming will not occur, and if it is warm-cooled, the foaming agent will escape, making it impossible to obtain a high foaming rate and deteriorating the appearance.
したがって従来の製造方法では発泡率の安定した発泡フ
ッ素樹脂絶縁電線を製造することは困難であった。Therefore, it has been difficult to manufacture a foamed fluororesin insulated wire with a stable expansion rate using conventional manufacturing methods.
発泡ポリエチレン絶縁電線などでは、発泡率を高めるた
めに、発泡剤含有樹脂と発泡剤を含まない樹脂とを、後
者を外側にして二重に押し出し、外側の樹脂層（スキン
層）により発泡剤を逃がさないようにして発泡させる方
式も知られている（特公昭５４−８８６６号公報）、シ
かしこの方法を発泡フッ素樹脂絶縁電線の製造に適用す
ると、内部の発泡圧力のみでは外側の樹脂層が十分に膨
張せず、結果的に発泡率の低いものしか得られない。In order to increase the foaming rate of foamed polyethylene insulated wires, etc., a foaming agent-containing resin and a foaming agent-free resin are double extruded with the latter on the outside, and the foaming agent is absorbed by the outer resin layer (skin layer). A method of foaming without escaping is also known (Japanese Patent Publication No. 54-8866).However, when this method is applied to the production of foamed fluororesin insulated wires, the outer resin layer is damaged by the internal foaming pressure alone. It does not expand sufficiently and as a result only a product with a low foaming rate is obtained.
本発明は、上記のような課題を解決する発泡フッ素樹脂
絶縁電線の製造方法を提供するもので、その方法は、押
出機のクロスヘッドから、その中を通過する心線上に発
泡剤含有フッ素樹脂を押出被覆し、その押出被覆層を発
泡させて発泡フッ素樹脂絶縁電線を製造する方法におい
て、上記心線として撚線を用い、その撚線をプレヒート
すると共に、上記クロスヘッド内のニップルの内部を減
圧することを特徴とするものである。The present invention provides a method for manufacturing a foamed fluororesin insulated wire that solves the above-mentioned problems, and the method involves applying a foaming agent-containing fluororesin from the crosshead of an extruder onto a core wire passing through the extruder. In the method of manufacturing a foamed fluororesin insulated wire by extrusion coating and foaming the extrusion coating layer, a stranded wire is used as the core wire, the stranded wire is preheated, and the inside of the nipple in the crosshead is heated. It is characterized by reducing the pressure.
心線を常温のままクロスヘッドに送り込むと、心線上に
押出被覆された発泡剤含有フッ素樹脂は心線に熱を奪わ
れ、心線付近で発泡し難くなるため、図−３に示すよう
に心線１１の周囲に比較的厚いフッ素樹脂の非発泡１１
１１２ａができ、その周囲に発泡１ｉ！１２ｂができる
ようになる。このため全体としての発泡率が高くならな
い、一方、クロスヘッドの手前で心線をプレヒートする
と、心線付近のフッ素樹脂もよ（発泡するため発泡率は
高くなるが、逆に導体とフッ素樹脂発泡層との密着性が
低下してしまうという問題が発生する。If the core wire is fed into the crosshead at room temperature, the foaming agent-containing fluororesin coated on the core wire by extrusion will absorb heat and become difficult to foam near the core wire, as shown in Figure 3. A relatively thick non-foamed fluororesin layer 11 is placed around the core wire 11.
112a is formed, and foaming 1i is formed around it! 12b will be possible. For this reason, the foaming rate as a whole does not increase.On the other hand, if the conductor is preheated before the crosshead, the fluororesin near the core will also foam (the foaming rate will increase, but on the other hand, the conductor and fluororesin will foam). A problem arises in that the adhesion with the layer decreases.
そこで本発明では、心線として撚線を用い、撚線のプレ
ヒートとニップル内部の減圧とを併用することで、発泡
率を高めると同時に、撚線表面の発泡ガスを撚線内部の
空隙を通して吸引することにより泡の発生を抑制し、図
−２に示すように撚線１１の表面にフッ素樹脂のごく薄
いＩＩ！１２ｃが形成されるようにして、撚線１１と発
泡層１２ｂとの密着性の向上を図ったものである。Therefore, in the present invention, a stranded wire is used as the core wire, and by using both preheating of the stranded wire and depressurization inside the nipple, the foaming rate is increased, and at the same time, the foaming gas on the surface of the stranded wire is sucked through the voids inside the stranded wire. As shown in Figure 2, the surface of the stranded wire 11 is coated with a very thin layer of fluororesin II! 12c is formed to improve the adhesion between the twisted wires 11 and the foam layer 12b.
以下、本発明の実施例を図−１を参照して詳細に説明す
る。Hereinafter, embodiments of the present invention will be described in detail with reference to FIG.
図において、１３は押出機本体部、１４は同押出機のク
ロスヘッド、１５と１６はその内部のニップルとダイス
である。クロスヘッド１４内にはニップル１５によって
中心に位置決めされた心！１１が軸線方向に走行する。In the figure, 13 is the main body of the extruder, 14 is the crosshead of the extruder, and 15 and 16 are the nipples and dies inside thereof. Inside the crosshead 14 is a heart centered by a nipple 15! 11 runs in the axial direction.
クロスヘッド１４からは、この心線ｌｌ上に発泡剤含有
フッ素樹脂１２が押出被覆される。From the crosshead 14, the foaming agent-containing fluororesin 12 is extruded and coated onto the core wire ll.
この押出被覆層はクロスヘッド１４を出ると圧力が開放
されるため発泡して発泡層１２ｂとなる。When this extruded coating layer exits the crosshead 14, the pressure is released, so that it foams and becomes a foamed layer 12b.
本発明はこのような方法で発泡フッ素樹脂絶縁電線を製
造する際に、心線１１として銅撚線またはアルミ撚線等
の撚線を用い、クロスヘッド１４の手前にヒーター１７
を設けて撚線１１をプレヒートすると共に、ニップル１
５の入口側に減圧装置１８を設けてニップル１５の内部
を減圧するようにしたものである。この減圧装置１８は
、撚線１１を通過させながら、ニップル１５の内部を７
００Ｔｏｒｒ以下、好ましくは４００〜５００τｏｒｒ
程度に保つため、差圧排気室１９と真空排気室２０とを
設け、それぞれ室を個別に真空ポンプ（図示せず）で真
空引きするようになっている。撚線１１のプレヒートの
温度は例えば１５０℃程度である。なお撚線１１のプレ
ヒートはニップル１５内にヒーターを設ける等してクロ
スへラド１４内で行うこともできる。The present invention uses stranded wires such as copper stranded wires or aluminum stranded wires as the core wire 11 when producing a foamed fluororesin insulated wire by such a method, and a heater 17 is placed in front of the crosshead 14.
is provided to preheat the stranded wire 11, and at the same time, the nipple 1 is
A pressure reducing device 18 is provided on the inlet side of the nipple 15 to reduce the pressure inside the nipple 15. This decompression device 18 allows the stranded wire 11 to pass through the inside of the nipple 15.
00 Torr or less, preferably 400 to 500 Torr
In order to maintain this level, a differential pressure evacuation chamber 19 and an evacuation chamber 20 are provided, and each chamber is individually evacuated using a vacuum pump (not shown). The temperature at which the stranded wire 11 is preheated is, for example, about 150°C. Note that the preheating of the stranded wire 11 can also be carried out within the cross wire rad 14 by providing a heater within the nipple 15 or the like.
上記の方法によると、撚線１１がプレヒートされるため
、その上に押出被覆された発泡剤含有フッ素樹脂１２は
撚ａｌｌに熱を奪われることなく十分に発泡する。また
ニップル１５の内部が減圧されるため、撚線１１表面に
発生する発泡ガスは撚線１１内の空隙を通して後方に吸
引され、発泡に寄与しなくなり、撚線１１の表面には図
−２に示すような薄い膜１２Ｃができ、これによって発
泡層１２ｂと撚線１１との密着性が高まることになる。According to the above method, since the stranded wire 11 is preheated, the foaming agent-containing fluororesin 12 coated thereon by extrusion is sufficiently foamed without losing heat to all the strands. In addition, since the inside of the nipple 15 is depressurized, the foaming gas generated on the surface of the stranded wire 11 is sucked backward through the voids in the stranded wire 11 and no longer contributes to foaming. A thin film 12C as shown is formed, which increases the adhesion between the foam layer 12b and the stranded wires 11.
以上説明したように本発明によれば、心線として撚線を
用い、その撚線のプレヒートとニップル内部の減圧とを
併用することにより、高発泡率でしかも心線との密着性
のよいフッ素樹脂発泡絶縁層を有する絶縁を線を安定し
て製造することができる。As explained above, according to the present invention, stranded wires are used as the core wires, and by combining preheating of the strands and depressurization inside the nipple, a fluorine-containing material with a high foaming rate and good adhesion to the core wires is produced. It is possible to stably manufacture an insulation wire having a resin foam insulation layer.
図−１は本発明の一実施例に係る発泡フッ素樹脂絶縁電
線の製造方法を示す断面図、図−２は本発明の方法で製
造される発泡フッ素樹脂絶縁電線の断面図、図−３は従
来の方法で製造される発泡フッ素樹脂絶縁電線の断面図
である。
１１：心線（撚線）、１２：発泡側含有フッ素樹脂、１
２ｂ：発泡層、１２Ｃ：薄膜、１３：押出機本体部、１
４：クロスヘッド、１５：ニップル、１６：ダイス、１
７：ヒーター、１８；減圧装置。Figure 1 is a sectional view showing a method for manufacturing a foamed fluororesin insulated wire according to an embodiment of the present invention, Figure 2 is a sectional view of a foamed fluororesin insulated wire manufactured by the method of the present invention, and Figure 3 is FIG. 2 is a cross-sectional view of a foamed fluororesin insulated wire manufactured by a conventional method. 11: Core wire (twisted wire), 12: Foaming side containing fluororesin, 1
2b: foam layer, 12C: thin film, 13: extruder main body, 1
4: Crosshead, 15: Nipple, 16: Dice, 1
7: Heater, 18; Pressure reducing device.
Claims (1)
上に発泡剤含有フッ素樹脂を押出被覆し、その押出被覆
層を発泡させて発泡フッ素樹脂絶縁電線を製造する方法
において、上記心線として撚線を用い、その撚線をプレ
ヒートすると共に、上記クロスヘッド内のニップルの内
部を減圧することを特徴とする発泡フッ素樹脂絶縁電線
の製造方法。1. In a method of manufacturing a foamed fluororesin insulated wire by extruding and coating a foaming agent-containing fluororesin onto a core wire passing through the crosshead of an extruder and foaming the extruded coating layer, the core wire is A method for manufacturing a foamed fluororesin insulated electric wire using stranded wires, the method comprising preheating the strands and reducing the pressure inside the nipple in the crosshead.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1025762A JPH02207424A (en) | 1989-02-06 | 1989-02-06 | Manufacture of forming fluorinated resin insulative wire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1025762A JPH02207424A (en) | 1989-02-06 | 1989-02-06 | Manufacture of forming fluorinated resin insulative wire |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02207424A true JPH02207424A (en) | 1990-08-17 |
Family
ID=12174846
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1025762A Pending JPH02207424A (en) | 1989-02-06 | 1989-02-06 | Manufacture of forming fluorinated resin insulative wire |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02207424A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105630016A (en) * | 2016-03-02 | 2016-06-01 | 杭州伟峰电子有限公司 | Novel enameling machine in-furnace waste gas concentration control method |
-
1989
- 1989-02-06 JP JP1025762A patent/JPH02207424A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105630016A (en) * | 2016-03-02 | 2016-06-01 | 杭州伟峰电子有限公司 | Novel enameling machine in-furnace waste gas concentration control method |
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