JPH0518207B2 - - Google Patents
Info
- Publication number
- JPH0518207B2 JPH0518207B2 JP60119037A JP11903785A JPH0518207B2 JP H0518207 B2 JPH0518207 B2 JP H0518207B2 JP 60119037 A JP60119037 A JP 60119037A JP 11903785 A JP11903785 A JP 11903785A JP H0518207 B2 JPH0518207 B2 JP H0518207B2
- Authority
- JP
- Japan
- Prior art keywords
- water
- conductive
- absorbing
- fibers
- fiber layer
- 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 - Fee Related
Links
- 239000000835 fiber Substances 0.000 claims description 43
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 20
- 239000000463 material Substances 0.000 claims description 13
- 239000011347 resin Substances 0.000 claims description 10
- 229920005989 resin Polymers 0.000 claims description 10
- 239000011230 binding agent Substances 0.000 claims description 7
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 229920002994 synthetic fiber Polymers 0.000 claims description 2
- 239000012209 synthetic fiber Substances 0.000 claims description 2
- 239000010410 layer Substances 0.000 description 28
- 239000004745 nonwoven fabric Substances 0.000 description 15
- 239000000843 powder Substances 0.000 description 12
- 238000010521 absorption reaction Methods 0.000 description 8
- 229920000728 polyester Polymers 0.000 description 5
- 239000004020 conductor Substances 0.000 description 4
- 229920000642 polymer Polymers 0.000 description 4
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000004952 Polyamide Substances 0.000 description 2
- -1 and once absorbed Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 229920002647 polyamide Polymers 0.000 description 2
- 229920002972 Acrylic fiber Polymers 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000002736 nonionic surfactant Substances 0.000 description 1
- 229920001197 polyacetylene Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Landscapes
- Coils Of Transformers For General Uses (AREA)
- Non-Insulated Conductors (AREA)
- Insulated Conductors (AREA)
Description
産業上の利用分野
本発明は、電力カーブル、通信用ケーブル、高
圧変圧器等に用いる吸水性を付加した導電性不繊
布ラツピング材の構成に関するものである。
従来の技術
近年、電力ケーブル、通信用ケーブル、高圧変
圧器の電極取出し部等、導体と絶縁体の間にコロ
ナ放電防止用の導電性不繊布が多用されている。
この導電性不繊布はテープ状に裁断してケーブル
のシース形成前に導体のケーブルに巻きつけた
り、シースとアルミ又は銅ジヤケツトの間に捲き
つけたり、またトランス電極部のスペーサー用に
は、口出し部周辺の複雑な形状に沿う様に広巾に
て使用されている。上記従来の導電性不繊布とし
ては、導電性繊維と通常の繊維との混合繊維から
なるものや導電性樹脂、あるいは導電性粉末を樹
脂に混合したもので以て繊維間を結合して構成し
たものがあり、その構造がポーラスで柔軟である
ので、紙状のものや繊物状の導電体に比べ、複雑
な形状に沿つて空間が出来にくく強度があり、テ
ーピング作業にも適する。又上記導電性不繊布は
近年開発された導電性フイルムと比べると上記利
点に加え、引き裂きに強く、小さなキズが発生し
た場合でも、キズを最小限にとどめることができ
るなどの理由により用いられつつある。
発明が解決しようとする問題点
然るにこれら従来の導電性不繊布では、通常の
使用時には問題がないが、何らかの原因で、水が
浸入した場合、毛細管現象による“水ばしり”現
象が発生し、浸水部分より広大な範囲にまで水が
拡がる事態が発生する。特にケーブル関係では、
敷設場所が地下の場合、地下水浸入の危険性に絶
えずさらされており、しかも敷設時、あるいは敷
設後の保守点検時に、不注意な取り扱いによりケ
ーブル端末とかケーブル外被に損傷をうけること
がある。そして水が浸入した場合、上述の“水ば
しり”現象で、浸水部分は、かなり広範囲に広が
り、又浸水箇所の発見も困難であるという問題点
がある。
この様な“水ばしり”現象を防止するため、吸
水性高分子をパウダー状にしたものを、不繊布層
の片側又は中間層に配置した、いわゆる水ばしり
防止導電性不繊布も使用され始めている。吸水性
高分子パウダーは、自重の数倍から数百倍の水を
吸収し、一度吸収した水は、多少の圧力では容易
に離水せず体積も著るしく増加するので水ばしり
防止には最適の様に思われる。しかし、吸水性パ
ウダーを、不繊布層に確実に固定するためには、
パウダー表面と繊維間を、樹脂等の結合剤で固定
しなければならず、その際、吸水性高分子パウダ
ーの殆んどの表面が、結合剤でおおわれてしま
い、吸水性機能が殆んど阻害されてしまう。そこ
で吸水性パウダーの機能を生かすように繊維間と
の結合剤を小量にすると、不繊布層と吸水性パウ
ダーの固定が不十分になりやすく、少しの衝撃で
吸水性パウダーが脱落するので、非常に取扱いに
くいという問題点がある。
発明が解決しようとする問題点
本発明は上記問題点を解決したものである。即
ち体積膨張率が少なくとも２倍以上である吸水性
繊維と熱融着繊維とで形成する吸水繊維層と、合
成繊維ウエブを導電性繊維又は導電性樹脂或は導
電請粉末等の導電性物質を少なくとも１種混合し
た樹脂結合剤で以て結合してなる導電性繊維層と
の２層構造として吸水導電性不繊布を構成し、電
力、通信用ケーブル等のラツピング材料として水
ばしりを完全に防止しうる吸水導電性ラツピング
材を提供するものである。
実施例
以下本発明の１実施例を図面に基づいて説明す
る。
図面は本発明の吸水導電性ラツピング材を示
し、第１図は該略構成断面図、第２図は吸水膨張
状態を示す構成図である。１は吸水繊維層であ
り、吸水時の体積膨張率が少なくとも２倍以上あ
る吸水性ポリエステル、ポリアミド、アクリル等
から選ばれた吸水性繊維を重量比で20乃至80％
と、熱融着性のポリエステル、ポリアミド、アク
リルから選ばれる熱融着性繊維を重量比で80乃至
20％とを混合したランダム又はカードウエブより
形成した繊維層である。
２は導電性繊維層であり、ポリエステル、アク
リル等の混合繊維より成るランダム又はカードウ
エブを、導電性繊維又は導電性樹脂又は導電性粉
末等の導電性物質を少なく共１種含有する樹脂結
合剤で以て結合した不繊布繊維層である。
そして、上記吸水繊維層１と導電性繊維層２の
積層層間３は熱融着性繊維の融点近辺まで加温し
た熱ロールで加圧することにより接着され、所望
の吸水導電性ラツピング材を構成する。尚、積
層々間の接着に当つては熱ロールの他公知の加熱
手段を用いてもよい。
ところで、上記吸水繊維層に於ける熱融着繊維
の配合比率が20％未満になると、熱融着のウエブ
強度が十分でなくなり、テーピング時の作業性が
悪くなり、また吸水繊維の使用量が20％未満にな
ると、吸水能力が低下し好ましくない。又体積膨
張率が２倍未満の繊維では水ばしり現象を完全に
阻止することが不可能となる。
更に上記導電性繊維層を形成する素材としてポ
リアセチレン等の導電性樹脂を用いてもよく、予
め繊維中に導電性物質を混入した導電性繊維を用
いることもできる。
また、本発明の吸水導電性ラツピング材の目付
（ｇ／m2）や厚みは使用目的に応じて適宜調整使
用することができる。
次に、本発明に係る吸水導電性ラツピング材の
具体例について説明する。
吸水性アクリル系繊維（「ランシールＦ」日本
エクスラン工業製）5de×51mm 50％と、融点が
130℃の熱融着性ポリエステル繊維、4de×50mm
50％とを混合した40ｇ／m3のカードウエブで吸
水繊維層１を成形した。次に、ポリエステル繊
維、4de×88mm 目付30ｇ／m3のカードウエブ
に、次の配合となる樹脂結合剤を含浸固着せしめ
て、目付84ｇ／m3、厚み0.3mmの導電性繊維層２
を形成した。
配合比
アクリル系樹脂 200部
カーポンブラツク 100部
ノニオン系界面活性剤 １部
上記導電性不繊布のカーボン付着量は18ｇ／m3
であり、JISK6911に準拠して測定した表面抵抗
値は2.5×102Ωであつた。
そして、上記吸水繊維層１と導電性繊維層２を
積層し、120℃近辺まで加熱した熱ロールで加圧
して上記吸水繊維層１と導電性繊維層２の層間３
を接着し、厚み０mm、目付124ｇ／m3の吸水導電
性ラツピング材を形成した。
次に、上記本発明の吸水導電性ラツピング材
と、比較例として従来の吸水性高分子パウダーを
充填したタイプの吸水性不繊布との性能比較のた
め、水吸収能力と吸収時の膨張高さのテストを行
つたところ、下表の結果を得た。
INDUSTRIAL APPLICATION FIELD The present invention relates to the construction of a conductive nonwoven wrapping material with added water absorption properties for use in power cables, communication cables, high-voltage transformers, and the like. BACKGROUND ART In recent years, conductive nonwoven fabrics for preventing corona discharge have been frequently used between conductors and insulators in power cables, communication cables, electrode lead-out portions of high-voltage transformers, and the like.
This conductive nonwoven fabric can be cut into a tape shape and wrapped around a conductor cable before forming a cable sheath, wrapped between a sheath and an aluminum or copper jacket, or used as a spacer for transformer electrodes around the lead-out part. It is used in a wide width to fit the complex shape of. The above-mentioned conventional conductive nonwoven fabrics are made of a mixture of conductive fibers and ordinary fibers, conductive resin, or a mixture of conductive powder and resin to bond the fibers together. Its structure is porous and flexible, so compared to paper-like or fiber-like conductors, it is difficult to create spaces along complex shapes and is strong, making it suitable for taping work. In addition to the above-mentioned advantages when compared to conductive films developed in recent years, the conductive nonwoven fabric is more resistant to tearing, and even if small scratches occur, they can be kept to a minimum. be. Problems to be Solved by the Invention However, these conventional conductive nonwoven fabrics do not have any problems during normal use, but if water gets into them for some reason, a "splashing" phenomenon occurs due to capillary action. A situation occurs in which water spreads to a larger area than the flooded area. Especially regarding cables,
If the cable is installed underground, it is constantly exposed to the risk of groundwater infiltration, and the cable terminal or cable sheath may be damaged due to careless handling during installation or during post-installation maintenance and inspection. When water intrudes, the above-mentioned "splashing" phenomenon causes the flooded area to spread over a fairly wide area, and it is also difficult to find the flooded area, which is a problem. In order to prevent this kind of "water splashing" phenomenon, so-called water splash-preventing conductive nonwoven fabrics are also used, in which a powdered water-absorbing polymer is placed on one side or in the middle layer of the nonwoven fabric layer. It's starting. Water-absorbing polymer powder absorbs several times to hundreds of times its own weight in water, and once absorbed, water does not easily separate from water under some pressure and its volume increases significantly, so it is difficult to prevent water from dripping. Seems to be optimal. However, in order to securely fix the water-absorbing powder to the nonwoven fabric layer,
It is necessary to fix the powder surface and the fibers with a binder such as resin, and in this case, most of the surface of the water-absorbing polymer powder is covered with the binder, which inhibits the water-absorbing function. It will be done. Therefore, if the amount of binder between the fibers is reduced to take advantage of the functions of the water-absorbing powder, the fixation of the nonwoven fabric layer and the water-absorbing powder will tend to be insufficient, and the water-absorbing powder will fall off with the slightest impact. The problem is that it is very difficult to handle. Problems to be Solved by the Invention The present invention solves the above problems. That is, a water-absorbing fiber layer formed of water-absorbing fibers and heat-fused fibers having a volumetric expansion coefficient of at least twice or more, and a synthetic fiber web are coated with a conductive material such as conductive fibers, conductive resin, or conductive powder. The water-absorbing conductive nonwoven fabric has a two-layer structure with a conductive fiber layer bonded with at least one mixed resin binder, and can be used as a wrapping material for electric power, communication cables, etc. to completely absorb water. The present invention provides a conductive wrapping material that can prevent water absorption. Embodiment An embodiment of the present invention will be described below based on the drawings. The drawings show the water-absorbing conductive wrapping material of the present invention; FIG. 1 is a schematic cross-sectional view of the structure, and FIG. 2 is a structural diagram showing the water-absorbing and expanded state. 1 is a water-absorbing fiber layer, which is made of 20 to 80% by weight water-absorbing fibers selected from water-absorbing polyester, polyamide, acrylic, etc., which have a volumetric expansion coefficient of at least twice when water is absorbed.
and heat-fusible fibers selected from heat-fusible polyester, polyamide, and acrylic at a weight ratio of 80 to 80.
This is a fiber layer formed from a random or carded web mixed with 20%. 2 is a conductive fiber layer, which is a random or carded web made of mixed fibers of polyester, acrylic, etc., and a resin binder containing at least one conductive substance such as conductive fibers, conductive resin, or conductive powder. It is a nonwoven fiber layer bonded with. Then, the laminated interlayer 3 of the water-absorbing fiber layer 1 and the conductive fiber layer 2 is bonded by pressing with a hot roll heated to around the melting point of the heat-fusible fiber, thereby forming a desired water-absorbing and conductive wrapping material. . Incidentally, in adhering the laminated layers, a known heating means other than a hot roll may be used. By the way, if the blending ratio of heat-fusible fibers in the water-absorbing fiber layer is less than 20%, the web strength for heat-welding will be insufficient, workability during taping will deteriorate, and the amount of water-absorbent fibers used will be reduced. If it is less than 20%, the water absorption capacity decreases, which is not preferable. Furthermore, if the fiber has a volumetric expansion coefficient of less than twice, it is impossible to completely prevent the blistering phenomenon. Furthermore, a conductive resin such as polyacetylene may be used as a material for forming the conductive fiber layer, and conductive fibers in which a conductive substance is mixed in advance may also be used. Further, the basis weight (g/m 2 ) and thickness of the water-absorbing conductive wrapping material of the present invention can be adjusted as appropriate depending on the purpose of use. Next, specific examples of the water-absorbing conductive wrapping material according to the present invention will be described. Water-absorbing acrylic fiber ("Lanseal F" manufactured by Nippon Exlan Kogyo) 5de x 51mm 50% and melting point
130℃ heat-fusible polyester fiber, 4de x 50mm
The water-absorbing fiber layer 1 was formed from a 40 g/m 3 carded web mixed with 50%. Next, a conductive fiber layer 2 of polyester fiber, 4de x 88mm, 30g/m 3 fabric weight, impregnated with a resin binder having the following composition, and 0.3mm thick, 84g/m 3 fabric weight, 0.3mm thickness.
was formed. Compounding ratio Acrylic resin 200 parts Carbon black 100 parts Nonionic surfactant 1 part The amount of carbon deposited on the above conductive nonwoven fabric is 18 g/m 3
The surface resistance value measured in accordance with JISK6911 was 2.5×102Ω. Then, the water-absorbing fiber layer 1 and the conductive fiber layer 2 are laminated, and the layer between the water-absorbing fiber layer 1 and the conductive fiber layer 2 is
were adhered to form a water-absorbing conductive wrapping material with a thickness of 0 mm and a basis weight of 124 g/m 3 . Next, in order to compare the performance of the above-mentioned water-absorbing conductive wrapping material of the present invention and a conventional water-absorbing nonwoven fabric filled with water-absorbing polymer powder as a comparative example, the water-absorbing capacity and swelling height upon absorption were compared. When we conducted the test, we obtained the results shown in the table below.
【表】
表において、水吸収能力はサンプルの大きさ、
10cm×10cmの不繊布に１％の食塩水を十分吸収さ
せ、水切り後これにKgの荷重を載せた後の不繊布
を含水量を示す。また膨張高さはこの時の厚みが
もとの厚みの何倍になつたかを示す。
発明の効果
本発明は従来のパウダー充填タイプの吸水導電
不繊布よりも、水吸収能力、膨張高さにおいてよ
り優れた数値を示し、電力ケーブル、通信ケーブ
ル等のラツピング材として水ばしり現象を完全に
防止することができ、しかも二層一体化構造にし
たので、層間に隙間が生ぜず、そのラツピング作
業も極めて容易である等のすぐれた効果を有する
発明である。[Table] In the table, the water absorption capacity is determined by the sample size and
A nonwoven fabric measuring 10cm x 10cm is fully absorbed with 1% saline solution, and after draining, a load of kg is placed on the nonwoven fabric, and the water content is shown. In addition, the expansion height indicates how many times the original thickness has become. Effects of the Invention The present invention exhibits better water absorption capacity and expansion height than conventional powder-filled water-absorbing conductive nonwoven fabrics, and can be used as a wrapping material for power cables, communication cables, etc. to completely eliminate the water-splashing phenomenon. Moreover, since it has a two-layer integrated structure, there are no gaps between the layers, and the wrapping operation is extremely easy.
図面は本発明の吸水導電性ラツピング材の１実
施例を示し、第１図は吸水前の概略構成断面図、
第２図は吸水膨張状態を示す構成図である。
１……吸水繊維層、２……導電性繊維層、３…
…積層層間。
The drawings show one embodiment of the water-absorbing conductive wrapping material of the present invention, and FIG. 1 is a schematic cross-sectional view of the structure before water absorption;
FIG. 2 is a configuration diagram showing a state of water absorption and expansion. 1... Water-absorbing fiber layer, 2... Conductive fiber layer, 3...
...between laminated layers.
Claims (1)
ある吸水性繊維（20乃至80％重量比）と熱融着性
繊維（80乃至20％重量比）とからなる吸水繊維層
と、合成繊維ウエブを導電性物質を含有せしめた
樹脂結合剤で結合した導電性繊維層との積層体で
構成され、上記積層繊維間相互を前記熱融着性繊
維の軟化溶融により結合固着せしめてなることを
特徴とする吸水導電性ラツピング材。1. A water-absorbing fiber layer consisting of water-absorbing fibers (20 to 80% weight ratio) and heat-fusible fibers (80 to 20% weight ratio) having a volume expansion coefficient of at least twice when water is absorbed, and a synthetic fiber web. and a conductive fiber layer bonded with a resin binder containing a conductive substance, and the laminated fibers are bonded and fixed to each other by softening and melting the heat-fusible fibers. A water-absorbing and conductive wrapping material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60119037A JPS61277110A (en) | 1985-05-31 | 1985-05-31 | Water absorbing conductive wrapping material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60119037A JPS61277110A (en) | 1985-05-31 | 1985-05-31 | Water absorbing conductive wrapping material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61277110A JPS61277110A (en) | 1986-12-08 |
| JPH0518207B2 true JPH0518207B2 (en) | 1993-03-11 |
Family
ID=14751392
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60119037A Granted JPS61277110A (en) | 1985-05-31 | 1985-05-31 | Water absorbing conductive wrapping material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61277110A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8085120B2 (en) * | 2009-08-13 | 2011-12-27 | Waukesha Electric Systems, Incorporated | Solid insulation for fluid-filled transformer and method of fabrication thereof |
-
1985
- 1985-05-31 JP JP60119037A patent/JPS61277110A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61277110A (en) | 1986-12-08 |
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|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |