JPH02253522A - Extrusion molding of plastic - Google Patents

Extrusion molding of plastic

Info

Publication number
JPH02253522A
JPH02253522A JP7529689A JP7529689A JPH02253522A JP H02253522 A JPH02253522 A JP H02253522A JP 7529689 A JP7529689 A JP 7529689A JP 7529689 A JP7529689 A JP 7529689A JP H02253522 A JPH02253522 A JP H02253522A
Authority
JP
Japan
Prior art keywords
nipple
tube
air
suction
holder
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
JP7529689A
Other languages
Japanese (ja)
Other versions
JPH0773014B2 (en
Inventor
Saburo Yagi
三郎 八木
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.)
Tatsuta Electric Wire and Cable Co Ltd
Original Assignee
Tatsuta Electric Wire and Cable Co 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 Tatsuta Electric Wire and Cable Co Ltd filed Critical Tatsuta Electric Wire and Cable Co Ltd
Priority to JP1075296A priority Critical patent/JPH0773014B2/en
Publication of JPH02253522A publication Critical patent/JPH02253522A/en
Publication of JPH0773014B2 publication Critical patent/JPH0773014B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Manufacturing Of Electric Cables (AREA)

Abstract

PURPOSE:To eliminate inner roughening of a sheath or variation in outer diameter thereof by inserting and fixing a dual tube whose front part is opened while the rear part is closed, and for which a suction tube is provided near the rear end in a communicating way, from the rear part of the inside of a nipple holder, in the direction of the front edge of the nipple so as to freely approach or to be easily controlled, and by applying negative pressure to the suction tube. CONSTITUTION:A dual tube 4 is built in a nipple holder 3, and a cable core 6 is inserted into an inner tube 19 of the dual tube 4. A suction tube 23 near the rear end of the dual tube 4 is connected by pipe with a vacuum pump 24, a suction path 21 of the dual tube 4 being turned into negative pressure so as to start outer coating extrusion molding. The core 6 is heated by a heater 18 and by a heat of a melting resin that is an outer coating material near a die 1 and a nipple 2, and the expansion of the air and the evaporation of water that are present in the core 6 occur mainly near the point of the nipple. The air and the water are actively inhaled from an open end 4a of the front part of the dual tube, and after they are inhaled, cool air is introduced instead. Air and water that cause inner roughening of a sheath and variation in outer diameter are efficiently ejected and air distribution is promoted.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、プラスチックの押出成形方法に係わり、特に
電線の外被押出成形に適したプラスチックの押出成形方
法に関する。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of extrusion molding plastics, and more particularly to a method of extrusion molding plastics suitable for extrusion molding the jacket of electric wires.

〔従来の技術〕[Conventional technology]

従来、ケーブル芯上に外被を押出成形するに際し、第2
図に示すように、電線の仕上がり外径よりかなり大きい
ダイaを用い、ニップルbの先端をダイaの先端と同−
又は若干突き出させて、外被Cをパイプ状に押出す所謂
パイプ型押出しをする場合がある。この場合、外被Cで
あるシースの樹脂押出し速度よりケーブル芯dの引き取
り速度を早くして、シース内面をケーブル芯dに密着さ
せるようにしていた。しかし、このシース押出成形方法
においては、以下の問題点を生じる。先ず、■ケーブル
芯dがニップルホルダーe1ニップルb1ダイaを通過
する間にケーブル芯dとシースの間に空気を巻き込み、
この空気によってシースが膨らんだり外径が変動する(
この現象は遮蔽金属テープ巻きのように巻き込み空気の
吸収部がないものにおいて顕著に現れる)、さらに、■
ニップルbの先端が加熱され、押出される樹脂が部分的
に分解して内面荒れが生じる。さらに、■押出成形時の
熱でケーブル芯d内に介在する空気や水分が膨張又は気
化して内面荒れあるいは外形変動が生じる等の問題点が
ある。
Conventionally, when extruding an outer jacket onto a cable core, a second
As shown in the figure, use a die a that is considerably larger than the finished outer diameter of the wire, and align the tip of the nipple b with the tip of the die a.
Alternatively, so-called pipe extrusion may be performed in which the outer cover C is extruded into a pipe shape with a slight protrusion. In this case, the cable core d was pulled out at a faster speed than the resin extrusion speed of the sheath, which is the outer cover C, so that the inner surface of the sheath was brought into close contact with the cable core d. However, this sheath extrusion molding method causes the following problems. First, while the cable core d passes through the nipple holder e1 nipple b1 die a, air is drawn between the cable core d and the sheath.
This air causes the sheath to swell and its outer diameter to change (
This phenomenon is noticeable when there is no absorption part for the trapped air, such as when wrapped with shielding metal tape).Furthermore,
The tip of nipple b is heated, and the extruded resin partially decomposes, causing inner surface roughness. Furthermore, there are problems such as (1) air and moisture present in the cable core d expand or vaporize due to heat during extrusion molding, causing inner surface roughness or outer shape variation.

そこで、これらの問題点の対策として、二ップルホルダ
ーe後端を真空ポンプfによって負圧にして、ケーブル
芯d内に介在する空気や水分を吸収して空気の巻き込み
を防止する方法が知られていた。しかし、ニップルホル
ダーe後端付近からの流入空気(漏れ空気)等によって
吸引力がそれほどでもなく、前記問題点■〜■の根本的
解決策にはならず、依然として、シースの内面荒れや外
径変動が生じていた。
Therefore, as a countermeasure to these problems, a method is known in which the back end of the double holder e is made negative pressure by a vacuum pump f to absorb the air and moisture present in the cable core d, thereby preventing air entrainment. Ta. However, the suction force is not so strong due to the inflow air (leakage air) from near the rear end of the nipple holder e, and it is not a fundamental solution to the above problems ① to ②. There was a change.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

本発明は、従来の技術の有するこのような問題点に鑑み
てなされたものであり、その目的とするところは、ケー
ブル芯へのシース押出工程において、空気や水分等の吸
引を確実にして、シースの内面荒れや外径変動のないプ
ラスチックの押出成形方法を提供しようとするものであ
る。
The present invention has been made in view of the problems of the conventional technology, and its purpose is to ensure the suction of air, moisture, etc. in the process of extruding the sheath to the cable core. The purpose of this invention is to provide a plastic extrusion molding method that does not cause inner surface roughness or outer diameter variation of the sheath.

〔課題を解決するための手段〕[Means to solve the problem]

上記目的を達成するために、本発明のプラスチックの押
出成形方法は、ダイ、ニップル、ニップルホルダーを支
持するクロスヘッドの前記ニップルホルダーの内側後方
から、先方を開放し後方を閉塞し後端近傍に吸引管を連
通状に植設した二重管を、その先方開放端の位置をニッ
プル先端方向に接近調整自在に挿通固定し、前記吸引管
に負圧を加える方法である。
In order to achieve the above object, the plastic extrusion molding method of the present invention includes a die, a nipple, and a crosshead that supports the nipple holder from the inside rear of the nipple holder, opens the front end, closes the rear end, and closes the crosshead near the rear end. This method involves inserting and fixing a double tube in which a suction tube is installed in a communicating manner so that the position of the open end of the double tube can be adjusted in the direction of the tip of the nipple, and applying negative pressure to the suction tube.

〔作用〕[Effect]

先方を開放し後方を閉塞し後端近傍に吸引管を連通状に
植設した二重管に負圧を加えると、吸引位置(二重管の
先方開放端)がニップル先端方向即ちニップ近傍となり
、空気や水分等の吸引が良好となり、ニップル先端付近
の空気や水分等の流れが促進されることによる冷却効果
も向上する。
When negative pressure is applied to a double tube with the front end open and the rear closed, and a suction tube connected in a continuous manner near the rear end, the suction position (the open end of the double tube) moves toward the tip of the nipple, that is, near the nip. , the suction of air, moisture, etc. is improved, and the cooling effect is also improved by promoting the flow of air, moisture, etc. near the tip of the nipple.

そして、この二重管の吸引位置を調整することによって
、最も良好な吸引位置への設定とすることができる。
By adjusting the suction position of this double pipe, the most favorable suction position can be set.

〔実施例〕〔Example〕

以下、図面に基づいて本発明の詳細な説明する。 Hereinafter, the present invention will be described in detail based on the drawings.

第1図は本発明のプラスチックの押出成形方法に使用さ
れるクロスヘッドの断面図である。先ず、第1図により
クロスヘッドの構造を説明して、次いでその押出成形方
法を説明する。
FIG. 1 is a sectional view of a crosshead used in the plastic extrusion molding method of the present invention. First, the structure of the crosshead will be explained with reference to FIG. 1, and then the extrusion molding method thereof will be explained.

第1図において、クロスヘッドは、グイ11ニツプル2
、ニップルホルダー3、二重管4、本体5を主要構成品
としている。
In Fig. 1, the crosshead is gui 11 nipple 2.
, a nipple holder 3, a double tube 4, and a main body 5 are the main components.

ダイ1はダイホルダー11のボルト12によって本体5
に固定され、グイホルダー11の調整ボルト13でニッ
プル2との偏肉が調整可能となっている。
The die 1 is attached to the main body 5 by the bolt 12 of the die holder 11.
The uneven thickness between the nipple 2 and the nipple 2 can be adjusted using the adjustment bolt 13 of the gooey holder 11.

ニップル2はニップルホルダー3先端に螺嵌され、その
外周2aはダイ内周1aと共に樹脂通路を形成し、その
内周2bはケーブル芯6の案内通路となっている。
The nipple 2 is screwed onto the tip of the nipple holder 3, and its outer periphery 2a forms a resin passage together with the die inner periphery 1a, and its inner periphery 2b serves as a guide passage for the cable core 6.

ニップルホルダー3はその後端にフランジ3aを有する
中空筒体であり、スリーブ14内に挿入され、押しボル
ト15及び引きボルト16によって前後方向の位置(即
ちニップル2のダイ1に対する先端位置)が調整可能で
ある。スリーブ14は、本体5の円錐穴5a内に挿入さ
れ、円錐穴5a内面とスリーブ14外周との間に、押出
穴17からリング状に展開する樹脂通路を形成している
The nipple holder 3 is a hollow cylindrical body having a flange 3a at its rear end, and is inserted into the sleeve 14, and its position in the front and rear direction (i.e., the position of the tip of the nipple 2 with respect to the die 1) can be adjusted by a push bolt 15 and a pull bolt 16. It is. The sleeve 14 is inserted into the conical hole 5a of the main body 5, and forms a resin passage extending in a ring shape from the extruded hole 17 between the inner surface of the conical hole 5a and the outer periphery of the sleeve 14.

なお、本体5及びダイ1の外周には加熱ヒータ18が張
りつけられ、クロスヘッド全体を加熱するようになって
いる。
Note that a heater 18 is attached to the outer periphery of the main body 5 and the die 1 to heat the entire crosshead.

二重管4は、内管19と外管20で構成され、ニップル
ホルダー3の内側後方から挿通されている。内管19は
ケーブル芯6の案内通路である(その両端は開放されて
いる)が、内管19と外管20が形成するリング空間は
吸引通路21となっている。したがって、吸引通路21
の先方は開放され、その後方はエンドプレート22によ
って閉塞されている。そして、二重管4の後端近傍で吸
引管23が吸引通路21と連通状に植設されている。こ
の吸引管23は真空ポンプ24に配管可能となっており
、吸引通路21を負圧にすることができる。この二重管
4は、スペーサ25とスリーブ26によって保持され、
ホルダー27で固定されている。スペーサ25は外管2
0に固着され、ニップルホルダー内面3aを摺動自在で
あり、二重管4とニップル2との間怠を保持するもので
ある。スリーブ26はニップルホルダー3後端に癖嵌さ
れ、二重管4を摺動自在に保持する。ホルダー27はス
リーブ26後端にボルト等で固定され、二重管4の前後
位置を決め固定するための止めボルト28を有している
。したがって、止めボルト28を緩め、二重管4を押し
引きすると、その先方開放端4aの位置をニップル先端
方向に接近調整自在である。なお、この接近調整自在な
他の構造としては、例えば台形螺子によるものや押し引
きボルトを用いる構造等がある。そして、二重管4後端
のパツキン30は漏斗型をしており、内管19に挿入さ
れてそのテーバ部で止まるようになっている。そして、
リングパツキン31でケーブル芯6間をシールして空気
の侵入をできるだけ少なくしている。また、吸引通路2
1内には図示されないリプが要所要所に設けられて全体
の剛性を確保するようになっている。
The double tube 4 is composed of an inner tube 19 and an outer tube 20, and is inserted into the nipple holder 3 from the inside rear. The inner tube 19 is a guide passage for the cable core 6 (both ends thereof are open), and the ring space formed by the inner tube 19 and the outer tube 20 is a suction passage 21. Therefore, the suction passage 21
The front end is open, and the rear end is closed by an end plate 22. A suction tube 23 is installed near the rear end of the double pipe 4 so as to communicate with the suction passage 21 . This suction pipe 23 can be connected to a vacuum pump 24, so that the suction passage 21 can be made to have a negative pressure. This double tube 4 is held by a spacer 25 and a sleeve 26,
It is fixed with a holder 27. The spacer 25 is the outer tube 2
0 and is slidable on the inner surface 3a of the nipple holder to maintain the gap between the double tube 4 and the nipple 2. The sleeve 26 is fitted onto the rear end of the nipple holder 3 to slidably hold the double tube 4. The holder 27 is fixed to the rear end of the sleeve 26 with a bolt or the like, and has a stop bolt 28 for determining and fixing the longitudinal position of the double pipe 4. Therefore, by loosening the fixing bolt 28 and pushing or pulling the double tube 4, the position of the open end 4a can be adjusted closer to the tip of the nipple. In addition, other structures that can freely adjust the approach include, for example, a structure using a trapezoidal screw or a structure using a push-pull bolt. The packing 30 at the rear end of the double pipe 4 is funnel-shaped and is inserted into the inner pipe 19 and stopped at its tapered portion. and,
A ring seal 31 seals between the cable cores 6 to minimize the intrusion of air. In addition, the suction passage 2
1, ribs (not shown) are provided at key points to ensure overall rigidity.

つぎに、上述した構成のクロスヘッドによる、プラスチ
ックの押出成形方法を第1図に基づいて説明する。第1
図において、ニップルホルダー3内に二重管4を組み込
み、この二重管4の内管19内にケーブル芯6を通す0
次いで、二重管4後端近傍の吸引管23を真空ポンプ2
4に配管接続し二重管4の吸引通路21を負圧にして、
外被押出成形を開始する。ケーブル芯6はダイ1とニッ
プル2近辺でヒータ18及び外被材である溶融樹脂の熱
で加熱され、ケーブル芯6に内在する空気の膨張や水分
の蒸発が主としてこのニップル先端付近で発生すること
となる。この空気や水分は二重管先方開放端4aから積
極的に吸引され、吸引された後には冷たいフレッシュ空
気(リングパツキン31の隙間等から入る空気)が導入
される。
Next, a plastic extrusion molding method using the crosshead configured as described above will be explained based on FIG. 1. 1st
In the figure, a double pipe 4 is installed in the nipple holder 3, and a cable core 6 is passed through the inner pipe 19 of the double pipe 4.
Next, the suction pipe 23 near the rear end of the double pipe 4 is connected to the vacuum pump 2.
4 and make the suction passage 21 of the double pipe 4 negative pressure.
Start the outer sheath extrusion. The cable core 6 is heated near the die 1 and nipple 2 by the heater 18 and the heat of the molten resin that is the jacket material, and the expansion of the air and evaporation of water contained in the cable core 6 mainly occur near the tip of the nipple. becomes. This air and moisture are actively sucked from the front open end 4a of the double tube, and after being sucked, cold fresh air (air that enters through the gap between the ring packings 31, etc.) is introduced.

このように、シースの内面荒れや外径変動の原因となる
空気や水分を効率よく排出して空気流通を促進する。そ
して、押出条件や外被材であるシースの材質等によって
最も効率的な吸引位置とすべく、その先方開放端4aの
位置をニップル先端方向に接近調整し、適切な位置で固
定して連続運転する。
In this way, air and moisture that cause inner surface roughness and outer diameter fluctuations of the sheath are efficiently discharged and air circulation is promoted. Then, in order to find the most efficient suction position depending on the extrusion conditions and the material of the sheath, etc., the position of the open end 4a is adjusted closer to the tip of the nipple, and is fixed at an appropriate position for continuous operation. do.

〔発明の効果〕〔Effect of the invention〕

本発明は、ダイ、ニップル、ニップルホルダーを支持す
るクロスヘッドの前記ニップルホルダーの内側後方から
、先方を開放し後方を閉塞し後端近傍に吸引管を連通状
に植設した二重管を、その先方開放端の位置をニップル
先端方向に接近調整自在に挿通固定し、前記吸引管に負
圧を加えるという押出成形方法によって、負圧の吸引位
置(二重管の先方開放端)をニップル先端方向即ちニッ
プ近傍とし、ニップル先端付近の空気や水分等の流れを
促進したので、空気や水分等の吸引が確実となり、シー
スの内面荒れや外径変動をなくすことができる。
The present invention provides a double tube which is opened from the inside rear of the nipple holder of the crosshead that supports the die, nipple, and nipple holder, has a front end open, a rear end closed, and a suction pipe connected in the vicinity of the rear end. By inserting and fixing the position of the open end of the nipple so that it can be adjusted in the direction of the tip of the nipple, and applying negative pressure to the suction tube, the suction position of negative pressure (the open end of the double tube) is adjusted to the tip of the nipple. Since the flow of air, moisture, etc. in the vicinity of the nip is promoted, the suction of air, moisture, etc. is ensured, and it is possible to eliminate roughness on the inner surface of the sheath and fluctuations in the outer diameter.

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

第1図は本発明のプラスチックの押出成形方法に使用さ
れるクロスヘッドの断面図、第2図は従来のプラスチッ
クの押出成形方法に使用されるクロスヘッドの断面図で
ある。なお、図面中の主な符号の説明は下記の通りであ
る。 1・・・ダイ 2・・・ニップル 3・・・ニップルホルダー 4・・・二重管 4a・・・先方開放端 21・・・吸引通路 23−・・吸引管 24・・・真空ポンプ 特許出願人  タック電線株式会社 代理人 弁理士  梶  良 之
FIG. 1 is a sectional view of a crosshead used in the plastic extrusion molding method of the present invention, and FIG. 2 is a sectional view of a crosshead used in a conventional plastic extrusion molding method. Note that explanations of main symbols in the drawings are as follows. 1...Die 2...Nipple 3...Nipple holder 4...Double tube 4a...Open end 21...Suction passage 23-...Suction tube 24...Vacuum pump patent application Yoshiyuki Kaji, Patent Attorney, Agent of TAC Electric Cable Co., Ltd.

Claims (1)

【特許請求の範囲】[Claims] (1)ダイ、ニップル、ニップルホルダーを支持するク
ロスヘッドの前記ニップルホルダーの内側後方から、先
方を開放し後方を閉塞し後端近傍に吸引管を連通状に植
設した二重管を、その先方開放端の位置をニップル先端
方向に接近調整自在に挿通固定し、前記吸引管に負圧を
加えることを特徴とするプラスチックの押出成形方法。
(1) From the inside rear of the nipple holder of the crosshead that supports the die, nipple, and nipple holder, insert a double pipe with the front end open, the rear end closed, and a suction pipe connected in the vicinity of the rear end. A plastic extrusion molding method, characterized in that the position of the open end of the nipple is inserted and fixed so as to be freely adjustable in the direction of the tip of the nipple, and negative pressure is applied to the suction tube.
JP1075296A 1989-03-27 1989-03-27 Extrusion molding method for plastics Expired - Lifetime JPH0773014B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1075296A JPH0773014B2 (en) 1989-03-27 1989-03-27 Extrusion molding method for plastics

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1075296A JPH0773014B2 (en) 1989-03-27 1989-03-27 Extrusion molding method for plastics

Publications (2)

Publication Number Publication Date
JPH02253522A true JPH02253522A (en) 1990-10-12
JPH0773014B2 JPH0773014B2 (en) 1995-08-02

Family

ID=13572140

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1075296A Expired - Lifetime JPH0773014B2 (en) 1989-03-27 1989-03-27 Extrusion molding method for plastics

Country Status (1)

Country Link
JP (1) JPH0773014B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002050246A (en) * 2000-08-07 2002-02-15 Mitsubishi Cable Ind Ltd Device for manufacturing coaxial cable
CN106098257A (en) * 2016-08-23 2016-11-09 春宾电缆集团有限公司 A kind of extruding machine cable wraps up in the operational approach of glue vacuum extractor

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5251368U (en) * 1975-10-09 1977-04-13

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5251368U (en) * 1975-10-09 1977-04-13

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002050246A (en) * 2000-08-07 2002-02-15 Mitsubishi Cable Ind Ltd Device for manufacturing coaxial cable
JP4637297B2 (en) * 2000-08-07 2011-02-23 三菱電線工業株式会社 Coaxial cable manufacturing equipment
CN106098257A (en) * 2016-08-23 2016-11-09 春宾电缆集团有限公司 A kind of extruding machine cable wraps up in the operational approach of glue vacuum extractor

Also Published As

Publication number Publication date
JPH0773014B2 (en) 1995-08-02

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