JPH0375121A - Preparation of running water preventing cable - Google Patents
Preparation of running water preventing cableInfo
- Publication number
- JPH0375121A JPH0375121A JP1212741A JP21274189A JPH0375121A JP H0375121 A JPH0375121 A JP H0375121A JP 1212741 A JP1212741 A JP 1212741A JP 21274189 A JP21274189 A JP 21274189A JP H0375121 A JPH0375121 A JP H0375121A
- Authority
- JP
- Japan
- Prior art keywords
- water running
- running prevention
- running water
- ethylene
- water preventing
- 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
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 68
- 239000000463 material Substances 0.000 claims abstract description 51
- 239000004020 conductor Substances 0.000 claims abstract description 40
- 229920000098 polyolefin Polymers 0.000 claims abstract description 35
- 239000000203 mixture Substances 0.000 claims abstract description 30
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 21
- 238000004132 cross linking Methods 0.000 claims abstract description 13
- 239000000155 melt Substances 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 8
- 239000011247 coating layer Substances 0.000 claims abstract description 7
- 238000001816 cooling Methods 0.000 claims abstract description 5
- 229920000620 organic polymer Polymers 0.000 claims abstract description 5
- 230000002265 prevention Effects 0.000 claims description 47
- 150000001451 organic peroxides Chemical class 0.000 claims description 15
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 239000005038 ethylene vinyl acetate Substances 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims description 6
- 229920006244 ethylene-ethyl acrylate Polymers 0.000 claims description 5
- 238000007765 extrusion coating Methods 0.000 claims description 4
- 239000003963 antioxidant agent Substances 0.000 claims description 2
- 230000003078 antioxidant effect Effects 0.000 claims description 2
- 239000010410 layer Substances 0.000 abstract description 12
- 229920001577 copolymer Polymers 0.000 abstract description 10
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 abstract description 3
- 239000005977 Ethylene Substances 0.000 abstract description 3
- 150000002978 peroxides Chemical class 0.000 abstract description 2
- 229920000642 polymer Polymers 0.000 abstract 1
- 239000004698 Polyethylene Substances 0.000 description 7
- 229920000573 polyethylene Polymers 0.000 description 7
- -1 polyethylenes Polymers 0.000 description 7
- 238000009413 insulation Methods 0.000 description 6
- 210000002445 nipple Anatomy 0.000 description 6
- 229920003020 cross-linked polyethylene Polymers 0.000 description 3
- 239000004703 cross-linked polyethylene Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- JIGUQPWFLRLWPJ-UHFFFAOYSA-N Ethyl acrylate Chemical compound CCOC(=O)C=C JIGUQPWFLRLWPJ-UHFFFAOYSA-N 0.000 description 1
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- ZFTFAPZRGNKQPU-UHFFFAOYSA-N dicarbonic acid Chemical compound OC(=O)OC(O)=O ZFTFAPZRGNKQPU-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 210000004709 eyebrow Anatomy 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- PNJWIWWMYCMZRO-UHFFFAOYSA-N pent‐4‐en‐2‐one Natural products CC(=O)CC=C PNJWIWWMYCMZRO-UHFFFAOYSA-N 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、走水防止用＆Ｉｌ威物により撚線導体間が充
填されてなる走水防止ケーブルに関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a water running prevention cable in which the spaces between stranded wire conductors are filled with a water running prevention material.
（従来の技術〕
従来より走水防止用組成物として、ケーブルの製造に於
ける撚線導体間への充填を容易にするために高メルトイ
ンデンクスのエチレン−酢酸ビニル共重合体またはエチ
レン−エチルアクリレート共重合体をベースとする、而
して低溶融粘度の架橋性組成物が使用され、充填後はケ
ーブルごと加熱して有機過酸化物にて架橋することが行
われている（例えば特公昭６０−３４２０５号、特公昭
６０−３４２０６号、特開昭６０−３４２０５号等参照
）、走水防止用＆１ＩＩＩｉ、物として有機過酸化物架
橋性のものを使用し、これを架橋する理由は、架橋しな
ければ撚線導体と走水防止用＆ＩＩＴｆ７．物との密２
着性が悪くて両者間に隙間が生してケーブルの走水防止
能が不良となると同業者間で認識されていたからである
。(Prior Art) Conventionally, high melt index ethylene-vinyl acetate copolymer or ethylene-ethyl copolymer has been used as a water running prevention composition to facilitate filling between stranded conductors in cable manufacturing. A crosslinking composition based on an acrylate copolymer and having a low melt viscosity is used, and after filling, the entire cable is heated and crosslinked with an organic peroxide (for example, 60-34205, Japanese Patent Publication No. 60-34206, Japanese Patent Publication No. 60-34205, etc.), for preventing water running &1IIIi, organic peroxide crosslinkable material is used as the material, and the reason for crosslinking it is as follows. If not cross-linked, the stranded wire conductor and water running prevention & IIT f7. Close contact with objects 2
This is because it was recognized among those in the industry that poor adhesion would result in a gap between the two, impairing the cable's ability to prevent water from running.
ところが上記の組成物は、共重合体の高メルトインデッ
クスのために、換言すると低分子量のために架橋し難い
性質があり、これを敢えて充分に架橋するためにケーブ
ルを高温度に長時間加熱することは省エネルギーの観点
から好ましくないのみならず、撚線導体が鈍る問題もあ
る。However, the above composition has the property of being difficult to crosslink due to the high melt index of the copolymer, in other words, due to its low molecular weight, and in order to sufficiently crosslink this, the cable is heated to a high temperature for a long time. This is not only undesirable from the viewpoint of energy saving, but also causes the problem that the stranded wire conductor becomes dull.
〔発明が解決しようとする課題〕
本発明は、上記に鑑みて高メルトインデックスのエチレ
ン−酢酸ビニル共重合体またはエチレンエチルアクリレ
ート共重合体を主成分とする走水防止材を使用するが、
これを従来のように敢えて架橋しようとしなくても良好
な走水防止能を示す走水防止ケーブルを製造する新規な
製造法を開発することである。[Problems to be Solved by the Invention] In view of the above, the present invention uses a water running prevention material containing a high melt index ethylene-vinyl acetate copolymer or ethylene ethyl acrylate copolymer as a main component.
The object of the present invention is to develop a new manufacturing method for manufacturing a water-running prevention cable that exhibits good water-running prevention ability without daringly attempting to crosslink it as in conventional methods.
この課題は、高メルトインデックスのエチレン−酢酸ビ
ニル共重合体及びエチレン−エチルアクリレート共重合
体を主成分とする走水防止材の溶融物を撚線導体間に圧
入充填し、その後該走水防止材を冷却することなく撚線
導体上に架橋性ポリオレフィン組成物を押出被覆し、次
いでこの被覆層を加熱架橋することにより解決する。This problem involved press-filling a melt of a water running prevention material mainly composed of high melt index ethylene-vinyl acetate copolymer and ethylene-ethyl acrylate copolymer between stranded wire conductors, and then This problem is solved by extrusion coating a crosslinkable polyolefin composition onto a stranded wire conductor without cooling the material, and then thermally crosslinking this coating layer.
而して本発明は、エチレン−酢酸ビニル共重合体及びエ
チレン−エチルアクリレート共重合体からなる群から選
ばれた少なくとも１種からなるメルトインデックスが少
なくとも５０の有機ポリマーを主成分とする走水防止材
の溶融物を撚線導体間に圧入充填し、その後該走水防止
材を８０℃以下に冷却することなく撚線導体上にポリオ
レフィン１００重量部あたり有機過酸化物架橋剤が少な
くとも０．５重量部の量比の架橋性ポリオレフィン組成
物を押出被覆し、次いで架橋性ポリオレフィン＆ｌｌ或
物の被覆層を加熱架橋することを特徴とする走水防止ケ
ーブルの製造方法である。Accordingly, the present invention provides a water running prevention material whose main component is an organic polymer having a melt index of at least 50 and consisting of at least one member selected from the group consisting of ethylene-vinyl acetate copolymer and ethylene-ethyl acrylate copolymer. A melt of the material is press-filled between the stranded wire conductors, and then at least 0.5 of the organic peroxide crosslinking agent per 100 parts by weight of polyolefin is added to the stranded wire conductors without cooling the anti-water running material below 80°C. This is a method for producing a water running prevention cable, characterized in that a crosslinkable polyolefin composition is extrusion coated in an amount of parts by weight, and then the coating layer of the crosslinkable polyolefin is crosslinked by heating.
本発明に於いては、走水防止材の圧入充填後から架橋性
ポリオレフィン組成物被覆層の加熱架橋終了に至るまで
の間は、圧入充填した走水防止材の温度を８０℃以上に
保持することによって全般的に走水防止材の撚ｖＡ導体
に対する密着性が頗る良好となる。その上に、走水防止
材としてポリオレフィン１００重量部あたり有機過酸化
物架橋剤が少なくとも０．５重量部の量比の架橋性ポリ
オレフィン組成物を用い、これの押出被覆層を加熱架橋
することによって架橋性ポリオレフィン組成物から移行
した有機過酸化物架橋剤によりｍ線導体の最外表面上あ
るいはその近傍の走水防止材が軽度ではあるが架橋して
、この結果一般に最も走水現象が生じ易いポリオレフィ
ン被覆層と撚ｖＡ導体との境界部、あるいはその近傍に
おける走水防止材の充填性並びに導体との密着性が向上
して予想外に優れた走水止能が達成される。In the present invention, the temperature of the press-filled anti-water running material is maintained at 80°C or higher from the time the anti-water running material is press-fitted until the heating crosslinking of the crosslinkable polyolefin composition coating layer is completed. As a result, the adhesion of the water running prevention material to the twisted vA conductor becomes extremely good overall. In addition, a crosslinkable polyolefin composition containing at least 0.5 parts by weight of an organic peroxide crosslinking agent per 100 parts by weight of polyolefin is used as a water running prevention material, and the extrusion coating layer thereof is crosslinked by heating. Due to the organic peroxide crosslinking agent transferred from the crosslinkable polyolefin composition, the water running prevention material on or near the outermost surface of the m-line conductor is slightly crosslinked, and as a result, the water running phenomenon is generally most likely to occur. The filling properties of the anti-water run material at or near the boundary between the polyolefin coating layer and the twisted VA conductor and the adhesion to the conductor are improved, and unexpectedly excellent water-stop performance is achieved.
第１図は本発明において用いられる押出機例の断面図を
示し、１は架橋性ポリオレフィン組成物を押出すための
押出機、２は走水防止材を押出すための押出機、３はク
ロスヘツド、４は撚線導体である。クロスヘツド３は、
クロスヘツド本体３１、ニップル３２、クロスヘツド本
体３１に装着された底形ダイス３３、走水防止材の逆流
防止栓３４、クロスヘツド本体３１とニップル３２との
間に形成された架橋性ポリオレフィン組成物の通路３５
、及びニップル３２の内側に設けされた走水防止材溜り
室３６とからなっている。押出４ａ１はクロスヘツド本
体３１に直結されて且つその樹脂吐出孔は通路３５に連
通しており、また押出機２はクロスヘツド本体３１に直
結されて且つその樹脂吐出孔は室３６に連通している。FIG. 1 shows a cross-sectional view of an example of an extruder used in the present invention, in which 1 is an extruder for extruding a crosslinkable polyolefin composition, 2 is an extruder for extruding a water running prevention material, and 3 is a crosshead. , 4 are twisted wire conductors. Crosshead 3 is
The crosshead body 31, the nipple 32, the bottom die 33 attached to the crosshead body 31, the backflow prevention plug 34 of the water running prevention material, and the passage 35 of the crosslinkable polyolefin composition formed between the crosshead body 31 and the nipple 32.
, and a water running prevention material reservoir chamber 36 provided inside the nipple 32. The extruder 4a1 is directly connected to the crosshead body 31 and its resin discharge hole communicates with the passage 35, and the extruder 2 is directly connected to the crosshead body 31 and its resin discharge hole communicates with the chamber 36.
逆流防止栓３４は撚線導体を通過させ得るが室３６内の
高圧の走水防止材溶融物の逆流は実際上防止し得る孔を
有し且つニップル３２の端に螺着されている。The backflow stopper 34 has a hole and is threaded onto the end of the nipple 32 to allow the stranded conductor to pass therethrough, but to virtually prevent backflow of the high pressure anti-water running material melt within the chamber 36.
第２図は、本発明の方法によって製造された走水防止ケ
ーブルの断面図例である。FIG. 2 is an example of a cross-sectional view of a water running prevention cable manufactured by the method of the present invention.
第１図及び第２図において、？２８線導体４を連続走行
させ、この間に押出機２からは走水防止材を、一方押出
機１からは架橋性ポリオレフィン組成物を押出す、なお
撚線導体４は、５０〜１５０℃、特に８０〜１００℃程
度に予熱してニップル３２に導入することが好ましい、
押出された走水防止材６は溶融状態で一旦室３６内を充
填し、その充填圧力によって撚線導体４を構成する導体
素線４１内の間隙４２を充填すると共に撚線導体４の最
外表面をもコートする。かく走水防止材６にて充填・コ
ートされた撚線導体４の上に押出機ｌから供給されたは
架橋性ポリオレフィン組成物が被覆され、該被ｆａｌｌ
はクロスヘンド本体３１に直結された架橋装置（図示せ
ず）に導入されて通常の条件並びに方法にて架橋されて
架橋ポリオレフィン絶縁層５となる。この架橋ポリオレ
フィン絶縁層５の架橋の際に前記したように、架橋性ポ
リオレフィン組成物−中に配合されている有機過酸化物
架橋剤の一部が走水防止材６中に移行して架橋ポリオレ
フィン絶縁層５と撚ｖＡ導体４との間７や撚線導体４の
表面近くの内部間隙に存在する走水防止材６をも架橋す
る。この架橋により撚線導体４の最外表面上あるいはそ
の近傍の走水防止材６を、あるいは少なくとも架橋ポリ
オレフィン絶縁ＩＷ５と撚線導体４との間７に存在する
走水防止材６をゲル分率にして５％以上、特に１０％以
上に架橋することが好ましい、この架橋は、架橋性ポリ
オレフィン＆Ｉｌ戒物中に配合される有機過酸化物架橋
剤の量を後記するようにし、且つ架橋ポリオレフィン絶
縁層５のゲル分率が少なくとも７０％となる充分な加熱
を行うことによって達成することが出来る。In Figures 1 and 2, ? The 28-wire conductor 4 is continuously run, and during this time, the extruder 2 extrudes the water running prevention material, and the extruder 1 extrudes the crosslinkable polyolefin composition. It is preferable to preheat it to about 80 to 100°C and introduce it into the nipple 32.
The extruded water running prevention material 6 once fills the chamber 36 in a molten state, and its filling pressure fills the gaps 42 in the conductor strands 41 constituting the stranded conductor 4 and also fills the outermost part of the stranded conductor 4. Also coat the surface. The crosslinkable polyolefin composition supplied from the extruder 1 is coated on the stranded wire conductor 4 filled and coated with the water running prevention material 6, and
is introduced into a crosslinking device (not shown) directly connected to the crosshend main body 31 and crosslinked under normal conditions and methods to form the crosslinked polyolefin insulating layer 5. As mentioned above, during crosslinking of the crosslinked polyolefin insulating layer 5, a part of the organic peroxide crosslinking agent blended in the crosslinkable polyolefin composition migrates into the water running prevention material 6, resulting in the crosslinked polyolefin insulating layer 5 being crosslinked. The water running prevention material 6 existing between the insulating layer 5 and the twisted VA conductor 4 and in the internal gap near the surface of the twisted wire conductor 4 is also bridged. By this crosslinking, the water running prevention material 6 on or near the outermost surface of the stranded wire conductor 4, or at least the water running prevention material 6 existing between the crosslinked polyolefin insulation IW 5 and the stranded wire conductor 4, has a gel fraction. The amount of crosslinking is preferably 5% or more, especially 10% or more.This crosslinking is carried out in such a manner that the amount of organic peroxide crosslinking agent blended in the crosslinkable polyolefin & II compound is as described below, and the crosslinked polyolefin insulation is This can be achieved by heating sufficiently so that the gel fraction of layer 5 is at least 70%.
本発明に於いて走水防止材６の主成分たるエチレン−酢
酸ビニル共重合体としては、酢酸ビニルの含有量にして
１０〜５０重量％、特には１５〜４５重量％であって、
メルトインデックスが少なくとも５０、好ましくは７０
〜５００、特には１００〜４００のものが好適である。In the present invention, the ethylene-vinyl acetate copolymer which is the main component of the water running prevention material 6 has a vinyl acetate content of 10 to 50% by weight, particularly 15 to 45% by weight,
Melt index of at least 50, preferably 70
-500, particularly 100-400 is suitable.
エチレン−エチルアクリレート共重合体としてもエチル
アクリレートの含有量にして１０〜５０重量％、特に１
５〜４５重量％であって、メルトインデックスが少なく
とも５０、好ましくは７０〜５００、特に１００〜４０
０のものが好適である。As an ethylene-ethyl acrylate copolymer, the content of ethyl acrylate is 10 to 50% by weight, especially 1
5 to 45% by weight with a melt index of at least 50, preferably 70 to 500, especially 100 to 40
A value of 0 is preferred.
上記２種の共重合体は単独で使用しても良く、あるいは
両者の任意比率の混合物として使用してもよい、要は、
両者の混合物が少なくとも５０のメルトインデックスを
持っていればよい。The above two types of copolymers may be used alone or as a mixture of the two in any ratio.In short,
It is sufficient that the mixture of both has a melt index of at least 50.
走水防止材６は、上記の２種の共重合体の一方あるいは
双方の混合物のみから構成されていてもよく、あるいは
通常の酸化防止剤やその他のこの分野で使用される配合
剤を通常量配合されていても良い、なお本発明に於いて
は、有機過酸化物架橋剤等の架橋剤の配合も別設排斥は
しないが、前記した理由にてそれを全く配合しなくても
本発明の課題を解決することが出来る。The water running prevention material 6 may be composed only of one or a mixture of the above two types of copolymers, or may contain a normal amount of a normal antioxidant or other compounding agents used in this field. Although the present invention does not exclude the inclusion of a crosslinking agent such as an organic peroxide crosslinking agent, the present invention does not exclude the inclusion of a crosslinking agent such as an organic peroxide crosslinking agent. It is possible to solve the problems of
本発明に於いては、架橋性ポリオレフィン＆ｌ威物とし
てポリオレフィン１００重量部あたり有機過酸化物架橋
剤が少なくとも０．５重量部の量比のものが使用される
。有機過酸化物架橋剤が０．５重量部未満であると、架
橋工程におけるそれの走水防止材６中への移行量が不充
分となって本発明の課題が達成されない、而して有機過
酸化物架橋剤の量はポリオレフィン１００重量部あたり
少なくとも０．７重量部、特に少なくとも１重量部とす
ることが好ましい、ポリオレフィンとしては、この分野
で従来使用されている各種のポリエチレンの他、低メル
トインデックスのエチレンの各種共重合体も使用出来る
。有機過酸化物架橋剤としては、ジク逅ルバーオキサイ
ドをはじめポリエチレンの架橋剤として知られているそ
の他のものも使用できる。In the present invention, the crosslinkable polyolefin & lactic agent used is one in which the amount of organic peroxide crosslinking agent is at least 0.5 parts by weight per 100 parts by weight of polyolefin. If the amount of the organic peroxide crosslinking agent is less than 0.5 parts by weight, the amount of the organic peroxide crosslinking agent transferred into the water running prevention material 6 during the crosslinking step will be insufficient, and the object of the present invention will not be achieved. The amount of peroxide crosslinking agent is preferably at least 0.7 parts by weight, especially at least 1 part by weight per 100 parts by weight of polyolefin. Polyolefins include various polyethylenes conventionally used in this field as well as low Various copolymers of ethylene with melt index can also be used. As the organic peroxide cross-linking agent, other compounds known as cross-linking agents for polyethylene, including dicarbonate, can also be used.
以下に実施例並びに比較例を示して、本発明の詳細な説
明する。EXAMPLES The present invention will be explained in detail by showing Examples and Comparative Examples below.
実施例１〜ｌＯ
直径２．０ｍｍの硬銅線１９本を撚合わせた撚線導体４
を予め８０℃に予熱して第１図に示す押出機に連続供給
し、走水防止材を温度１００℃、押出圧力（室３６の圧
力） ４０ｋｇ／ｃｍ”で室３６に供給して撚線導体４
内に圧入した。圧入した走水防止材の温度が低下する暇
もない間に撚線導体４上に架橋性ポリエチレン絶縁組成
物を押出被覆し、次いで連続架橋管に導入して２００℃
、７分の条件で高圧水蒸気で加熱してポリエチレン絶縁
組成物層を架橋し、厚さ’１．５ｍｍの架橋ポリエチレ
ン絶縁層５を有する走水防止ケーブルを製造した。Example 1~lO Twisted wire conductor 4 made of 19 hard copper wires with a diameter of 2.0 mm twisted together
is preheated to 80°C and continuously supplied to the extruder shown in Fig. 1, and the anti-water running material is supplied to chamber 36 at a temperature of 100°C and an extrusion pressure (pressure in chamber 36) of 40 kg/cm'' to form a stranded wire. conductor 4
It was pressed inside. Before the temperature of the press-fitted water running prevention material has time to drop, a crosslinkable polyethylene insulation composition is extruded and coated onto the stranded wire conductor 4, and then introduced into a continuous crosslinked pipe and heated to 200°C.
The polyethylene insulating composition layer was crosslinked by heating with high pressure steam for 7 minutes to produce a water running prevention cable having a crosslinked polyethylene insulating layer 5 with a thickness of 1.5 mm.
比較例１〜３
走水防止材の撚＆Ｉ導体４内への圧入工程と架橋性ポリ
エチレン絶縁組成物の押出被覆工程をタンデム方式とし
、そのために撚線導体４内に圧入された走水防止材は架
橋性ポリエチレン絶縁組成物の押出被覆までの間にかな
り冷却されたことに於いて実施例と異なり、他の条件は
実施例と同様である走水防止ケーブルの製造を行った。Comparative Examples 1 to 3 The process of twisting the water running prevention material and press-fitting it into the I conductor 4 and the extrusion coating process of the crosslinkable polyethylene insulating composition were carried out in tandem, and the water running prevention material was press-fitted into the stranded conductor 4 for this purpose. A water running prevention cable was manufactured under the same conditions as in the example except that the crosslinkable polyethylene insulating composition was cooled considerably before being extruded and coated.
第１表には、用いた走水防止用Ｍｉｌ酸物種類、架橋性
ポリエチレン絶縁組成物の種類、架橋後における架橋ポ
リエチレン絶縁層５のゲル分率、撚線導体４と架橋ポリ
エチレン絶縁層５との層間７に存在する走水防止材のゲ
ル分率、撚線導体４内へ圧入された走水防止材の架橋性
ポリエチレン絶縁Ａｌｌ酸物の架橋工程に至るまでの間
に到達した最低温度、ケーブルの走水防止性能等につい
ての測定結果を示す。Table 1 shows the type of anti-water running Mil acid used, the type of crosslinkable polyethylene insulation composition, the gel fraction of the crosslinked polyethylene insulation layer 5 after crosslinking, the stranded conductor 4 and the crosslinked polyethylene insulation layer 5. The gel fraction of the anti-water running material present in the interlayer 7 of The measurement results regarding the cable's water running prevention performance, etc. are shown.
ゲル分率は、すべてＪＩＳ Ｃ３００５により測定した
。またケーブルの走水防止性能は、長さ１００ｃｍのケ
ーブルの一方の切断面に０．５ｋｇ／ｃｍ２の水圧をか
けて２４時間放置し、その後においてケーブルの他方の
切断面から水が滲み出るか否かを調べ、水が滲みが認め
られた場合を不合格、認められなかった場合を合格とし
た。All gel fractions were measured according to JIS C3005. In addition, the water running prevention performance of a cable is determined by applying a water pressure of 0.5 kg/cm2 to one cut surface of a 100 cm long cable and leaving it for 24 hours.After that, water seeps out from the other cut surface of the cable. If water seepage was observed, it was judged as a failure, and if no water was observed, it was judged as a pass.
（発明の効果）
本発明によれば、走水防止材として架橋剤を配合してい
ないものでも使用出来るので、ケーブル製造コストの面
で頗る有利である。(Effects of the Invention) According to the present invention, even a material not containing a crosslinking agent can be used as a water running prevention material, which is extremely advantageous in terms of cable manufacturing costs.
第１図は本発明において用いられる押出機例の断面図を
示し、第２図は、本発明の方法によって製造された走水
防止ケーブルの断面図例である。
ｌ 架橋性ポリオレフィン組成物を押出すための押出
機
２ 走水防止材を押出すための押出機３ クロスヘ
ツド
３１ クロスヘツド本体
３２ ニップル３２
３３ 底形ダイス３３
３４ 走水防止材の逆流防止栓
３５ 架橋性ポリオレフィンｍｔ物の通路３６ 走水防
止材温り室３６
４ 撚線導体
４１ 導体素線
導体素線４１内の間諜
絶縁層
走水防止材
絶縁層５と撚線導体４との眉間
（以上）FIG. 1 shows a cross-sectional view of an example of an extruder used in the present invention, and FIG. 2 shows a cross-sectional view of an example of a water running prevention cable manufactured by the method of the present invention. l Extruder 2 for extruding the crosslinkable polyolefin composition Extruder 3 for extruding the water running prevention material Crosshead 31 Crosshead body 32 Nipple 32 33 Bottom die 33 34 Backflow prevention stopper for water running prevention material 35 Crosslinkability Passage 36 for polyolefin mt material Warming chamber 36 for anti-water running material 4 Twisted wire conductor 41 Conductor strands Interstitial insulating layer in the conductor strand 41 Between the eyebrows (or more) between the anti-water running material insulating layer 5 and the stranded conductor 4
Claims (4)
チルアクリレート共重合体からなる群から選ばれた少な
くとも１種からなるメルトインデックスが少なくとも５
０の有機ポリマーを主成分とする走水防止材の溶融物を
撚線導体間に圧入充填し、その後該走水防止材を８０℃
以下に冷却することなく撚線導体上にポリオレフィン１
００重量部あたり有機過酸化物架橋剤が少なくとも０．
５重量部の量比の架橋性ポリオレフィン組成物を押出被
覆し、次いで架橋性ポリオレフィン組成物の被覆層を加
熱架橋することを特徴とする走水防止ケーブルの製造方
法。(1) A melt index of at least 5 consisting of at least one member selected from the group consisting of ethylene-vinyl acetate copolymer and ethylene-ethyl acrylate copolymer
A molten water running prevention material mainly composed of an organic polymer of No.
Polyolefin on stranded conductor without cooling below 1
At least 0.00 parts by weight of organic peroxide crosslinking agent.
1. A method for producing a water running prevention cable, which comprises extrusion coating a crosslinkable polyolefin composition in an amount of 5 parts by weight, and then crosslinking the coating layer of the crosslinkable polyolefin composition by heating.
０の上記有機ポリマーのみからなる第１請求項に記載の
走水防止ケーブルの製造方法。(2) The water running prevention material has a melt index of at least 5.
The method for manufacturing a water running prevention cable according to claim 1, which is made of only the above-mentioned organic polymer of 0.
０の上記有機ポリマーと酸化防止剤とからなり、架橋剤
を含まないものである第１請求項に記載の走水防止ケー
ブルの製造方法。(3) The water running prevention material has a melt index of at least 5.
The method for producing a water running prevention cable according to claim 1, wherein the cable is made of the above-mentioned organic polymer of 0 and an antioxidant, and does not contain a crosslinking agent.
酸化物架橋剤により撚線導体の最外表面上あるいはその
近傍の走水防止材を、ゲル分率にして５％以上に架橋す
る第１請求項〜第１請求項３に記載の走水防止ケーブル
の製造方法。(4) The first claim in which the anti-water running material on or near the outermost surface of the stranded wire conductor is crosslinked to a gel fraction of 5% or more using an organic peroxide crosslinking agent transferred from a crosslinkable polyolefin composition. 4. A method for manufacturing a water running prevention cable according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1212741A JP2715150B2 (en) | 1989-08-17 | 1989-08-17 | Manufacturing method of anti-water running cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1212741A JP2715150B2 (en) | 1989-08-17 | 1989-08-17 | Manufacturing method of anti-water running cable |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0375121A true JPH0375121A (en) | 1991-03-29 |
| JP2715150B2 JP2715150B2 (en) | 1998-02-18 |
Family
ID=16627661
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1212741A Expired - Fee Related JP2715150B2 (en) | 1989-08-17 | 1989-08-17 | Manufacturing method of anti-water running cable |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2715150B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6778408B2 (en) | 2001-12-06 | 2004-08-17 | Samsung Electronics Co., Ltd. | Computer having an improved casing structure |
-
1989
- 1989-08-17 JP JP1212741A patent/JP2715150B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6778408B2 (en) | 2001-12-06 | 2004-08-17 | Samsung Electronics Co., Ltd. | Computer having an improved casing structure |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2715150B2 (en) | 1998-02-18 |
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