JPH0588057A - Optical fiber unit - Google Patents
Optical fiber unitInfo
- Publication number
- JPH0588057A JPH0588057A JP3628291A JP3628291A JPH0588057A JP H0588057 A JPH0588057 A JP H0588057A JP 3628291 A JP3628291 A JP 3628291A JP 3628291 A JP3628291 A JP 3628291A JP H0588057 A JPH0588057 A JP H0588057A
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- foamed plastic
- fiber unit
- foamed
- filler
- 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
- 239000013307 optical fiber Substances 0.000 title claims abstract description 32
- 239000011247 coating layer Substances 0.000 claims abstract description 17
- 229920003023 plastic Polymers 0.000 claims abstract description 17
- 239000004033 plastic Substances 0.000 claims abstract description 17
- 239000000945 filler Substances 0.000 claims abstract description 16
- 239000010410 layer Substances 0.000 claims abstract description 16
- 239000000463 material Substances 0.000 claims abstract description 8
- 230000003287 optical effect Effects 0.000 claims description 4
- 229920005989 resin Polymers 0.000 abstract description 11
- 239000011347 resin Substances 0.000 abstract description 11
- 239000000835 fiber Substances 0.000 abstract description 9
- 238000013329 compounding Methods 0.000 abstract 2
- 239000006260 foam Substances 0.000 description 9
- 238000001125 extrusion Methods 0.000 description 6
- 239000004698 Polyethylene Substances 0.000 description 4
- 238000005187 foaming Methods 0.000 description 4
- 238000002844 melting Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 229920000573 polyethylene Polymers 0.000 description 4
- 238000005086 pumping Methods 0.000 description 4
- 230000003746 surface roughness Effects 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000004743 Polypropylene Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 239000005038 ethylene vinyl acetate Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 229920001903 high density polyethylene Polymers 0.000 description 2
- 239000004700 high-density polyethylene Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000003292 diminished effect Effects 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000007788 roughening Methods 0.000 description 1
Landscapes
- Light Guides In General And Applications Therefor (AREA)
- Electric Cable Installation (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、光ファイバユニットを
空気の流圧を利用して圧送する方式（以下、エアブロー
ファイバシステムという。）における光ファイバユニッ
トに係り、特に圧送特性の優れた光ファイバユニットに
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical fiber unit in a system for pressure-feeding an optical fiber unit by utilizing air pressure (hereinafter referred to as an air blow fiber system), and more particularly to an optical fiber having excellent pressure-feeding characteristics. Regarding the unit.
【０００２】[0002]
【従来の技術】近年、すでに布設された長いポリエチレ
ン（PE）等のパイプの中に光ファイバユニットを挿通す
る方法として、光ファイバの損傷が少ないエアブローフ
ァイバシステムが提案され、引き綱による方法に代わっ
て採用されつつある。2. Description of the Related Art In recent years, as a method of inserting an optical fiber unit into a long pipe such as polyethylene (PE) that has already been laid, an air blow fiber system with little damage to the optical fiber has been proposed, and has replaced the method using a tow rope. Are being adopted by
【０００３】このようなエアブローファイバシステムに
おいては、光ファイバユニットは空気の流れに沿ってパ
イプ中を圧送するためできるだけ軽くかつ空気の流れ抵
抗を大きくし、さらにはパイプ内面との滑りを良くする
ことが好ましい。In such an air blow fiber system, the optical fiber unit pumps the air along the flow of air in the pipe so that it is as light as possible and the flow resistance of the air is increased, and the sliding with the inner surface of the pipe is improved. Is preferred.
【０００４】したがって、光ファイバユニットの比重を
軽くし空気の流れ抵抗を大きくするために、光ファイバ
ユニットの外側被覆を発泡率の高い発泡プラスチック層
で形成するとともに、この被覆層の表面に凹凸をつけて
表面積を大きくする試みがなされている。なお、被覆層
の表面を粗くすることは帯電防止効果もある。Therefore, in order to reduce the specific gravity of the optical fiber unit and increase the air flow resistance, the outer coating of the optical fiber unit is formed of a foamed plastic layer having a high foaming rate, and the surface of the coating layer is uneven. Attempts have been made to attach it to increase the surface area. In addition, roughening the surface of the coating layer also has an antistatic effect.
【０００５】従来は光ファイバユニットの軽さや表面粗
さを得るために、上記発泡層を形成する発泡剤入り樹脂
の押出し条件をいろいろ変えて、光ファイバユニットの
圧送特性の向上を計ってきた。Conventionally, in order to obtain the lightness and the surface roughness of the optical fiber unit, various conditions for extruding the resin containing the foaming agent forming the foam layer have been variously changed to improve the pressure-feeding characteristics of the optical fiber unit.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、このよ
うな押出し条件によって発泡層を調整する方法では、均
一に荒れた表面状態を安定して得ることは難しく、光フ
ァイバユニットの生産性も低いという問題がある。However, it is difficult to stably obtain a uniformly rough surface state and the productivity of the optical fiber unit is low in the method of adjusting the foam layer by such extrusion conditions. There is.
【０００７】本発明はこのような点に対処してなされた
もので、外観表面が均一に荒れた発泡プラスチック層を
安定して生産性よく形成することができ、プラスチック
パイプ中に空気圧にて挿通するのに好適な圧送特性の優
れた光ファイバユニットを提供することを目的とする。The present invention has been made in consideration of such a point, and a foamed plastic layer having a rough outer surface can be stably formed with good productivity, and the foamed plastic layer is pneumatically inserted into a plastic pipe. It is an object of the present invention to provide an optical fiber unit having excellent pumping characteristics suitable for the above.
【０００８】[0008]
【課題を解決するための手段】すなわち、本発明の光フ
ァイバユニットは、複数の光ファイバ心線に共通被覆層
を介して発泡プラスチック層を設けてなる光ファイバユ
ニットにおいて、この発泡プラスチック層を構成する発
泡プラスチック材料は 1〜30PHR （樹脂100 重量部当た
りの配合重量部）、好ましくは 3〜20 PHRのフィラーを
含有することを特徴とする。That is, the optical fiber unit of the present invention is an optical fiber unit in which a plurality of optical fiber cores are provided with a foamed plastic layer via a common coating layer, and the foamed plastic layer is formed. The foamed plastic material is characterized in that it contains 1 to 30 PHR (parts by weight per 100 parts by weight of resin), preferably 3 to 20 PHR of filler.
【０００９】上記フィラー粒子の平均粒径は１〜300 μ
m の範囲、特には5 〜100 μm の範囲が好ましい。また
発泡率は、20〜60％の範囲、好ましくは30〜50％の範囲
が適当である。20％未満では比重が大きくなり、60％を
越えると剛性が低下していずれも本発明の効果が定減す
る。The average particle size of the filler particles is 1 to 300 μm.
A range of m, especially 5 to 100 μm, is preferred. Further, the foaming rate is appropriately in the range of 20 to 60%, preferably 30 to 50%. If it is less than 20%, the specific gravity becomes large, and if it exceeds 60%, the rigidity is lowered and the effect of the present invention is diminished.
【００１０】本発明において、フィラーの添加量を上記
の範囲としたのは、１PHR 未満では本発明の効果が認め
られず、30PHR を越えると被覆層の機械的特性や加工性
等の物性が劣化するためである。In the present invention, the amount of the filler added is in the above range because the effect of the present invention is not recognized when it is less than 1 PHR and the physical properties such as mechanical properties and workability of the coating layer are deteriorated when it exceeds 30 PHR. This is because
【００１１】[0011]
【作用】本発明においては、ベースレジンである発泡プ
ラスチック材料にフィラーを添加し、これを用いて通常
の押出しにより発泡層を形成するものであり、所望の均
一な表面粗さの発泡被覆層を安定して形成することがで
き、圧送特性の向上したエアブローファイバシステム用
光ファイバユニットを得ることができる。In the present invention, a filler is added to a foamed plastic material which is a base resin, and a foamed layer is formed by ordinary extrusion using this, and a foamed coating layer having a desired uniform surface roughness is formed. An optical fiber unit for an air blow fiber system that can be stably formed and has improved pumping characteristics can be obtained.
【００１２】また、発泡層の表面粗さが均一なため、押
出し作業に要する時間が従来より大幅に短縮され、した
がって光ファイバユニットの生産性が向上し、コストを
低減させることができる。Further, since the surface roughness of the foam layer is uniform, the time required for the extrusion work is significantly shortened as compared with the conventional case, and therefore the productivity of the optical fiber unit is improved and the cost can be reduced.
【００１３】[0013]
【実施例】以下、本発明の実施例を説明する。図１は本
発明の実施例の光ファイバユニットの構造を示すもので
あり、６心の光フアイバ心線１と引き裂き用のポリエス
テルひも２を撚り合わせて、これにナイロン樹脂による
被覆を施し、この共通被覆層３の上にプラスチックを発
泡させた発泡被覆層４を形成している。EXAMPLES Examples of the present invention will be described below. FIG. 1 shows the structure of an optical fiber unit according to an embodiment of the present invention. A 6-fiber optical fiber core 1 and a polyester string 2 for tearing are twisted together, and a nylon resin coating is applied to this. A foam coating layer 4 formed by foaming plastic is formed on the common coating layer 3.
【００１４】上記構成の光ファイバユニットの発泡被覆
層４の材料は、それぞれ発泡剤を含有する融点 135℃の
高密度ポリエチレン（HDPE）、および融点 158℃のポリ
プロピレン（PP）100 重量部と融点80℃のエチレン−酢
酸ビニル共重合体（EVA ）10重量部からなる混合樹脂の
いずれかをベースに、表１に示すフィラーを表２のごと
く配合して調製した。ついで、このように調製した各発
泡被覆材料を共通被覆層３の上に発泡押出し被覆した。The material of the foam coating layer 4 of the optical fiber unit having the above-mentioned structure is made of high density polyethylene (HDPE) having a melting point of 135 ° C. and polypropylene (PP) having a melting point of 158 ° C. 100 parts by weight and a melting point of 80, respectively. It was prepared by blending the filler shown in Table 1 as shown in Table 2 with any of the mixed resins consisting of 10 parts by weight of ethylene-vinyl acetate copolymer (EVA) at 0 ° C. as a base. Then, the foam coating materials thus prepared were foamed and extrusion-coated on the common coating layer 3.
【００１５】[0015]
【表１】 [Table 1]
【００１６】次ぎに、胴径1mの圧送試験用ドラムに内径
6m外径8mのＰＥパイプを500m巻き付け、この中に一定圧
力の空気を用いて上記発泡被覆層を形成した光ユニット
を圧送して、500m挿通するのに要した時間を圧送特性と
して測定した。また、比較例としてフィラーを含まない
ベース樹脂のみからなる発泡層を形成した光ユニットに
ついても同様にして圧送特性を測定した。その結果を表
２に示す。Next, the inner diameter of the drum for the pressure feeding test with a body diameter of 1 m
A PE pipe having an outer diameter of 6 m and a diameter of 8 m was wound around 500 m, and air having a constant pressure was used to pressure-feed the optical unit having the foam coating layer, and the time required for inserting the optical unit for 500 m was measured as the pressure-feeding characteristic. Also, as a comparative example, the pressure-feeding characteristics were measured in the same manner for an optical unit in which a foamed layer made of only a base resin containing no filler was formed. The results are shown in Table 2.
【００１７】[0017]
【表２】 [Table 2]
【００１８】表２からも明らかなように、ベース用発泡
樹脂に微粉末状のフィラー粒子を配合したものはいずれ
も、配合しないものに比べて圧送特性が向上した。As is clear from Table 2, all of the foamed resin for the base compounded with the finely powdered filler particles improved the pumping property as compared with the compound without the compounded compound.
【００１９】なお、添加するフィラーはベース用樹脂よ
りも20℃以上高い融点を持つものを選定することが必要
で、このような非発泡性のフイラーを配合することで発
泡層の外観が均一に荒れた状態となるとともに、滑性が
向上する。It is necessary to select a filler having a melting point higher than that of the base resin by 20 ° C. or more. By blending such a non-foaming filler, the foamed layer has a uniform appearance. It becomes rough and the lubricity is improved.
【００２０】また、このようにフィラー粒子を配合した
発泡プラスチック材料は、通常の押出し条件で均一に荒
れた凹凸表面を有する被覆層を安定して発泡押出し成形
することができ、そのため従来の押出し作業と比較して
その速度は 4〜5 倍速くすることが可能となり、光ファ
イバユニットの生産性が向上してコストを大幅に低下さ
せるという効果ももたらす。Further, in the foamed plastic material containing the filler particles as described above, a coating layer having a uniformly rough surface can be stably foamed and extruded under normal extrusion conditions. Compared with, the speed can be increased 4 to 5 times, and the productivity of the optical fiber unit is improved, and the cost is significantly reduced.
【００２１】上述の本発明の光ファイバユニットは、例
えば 2.2kV〜 6.6kV使用のCVトリプレックスケーブルに
３本撚り合わせられているような内径 6mmのＰＥパイプ
中にエアブローファイバシステムにより迅速に布設する
ことができる。The above-mentioned optical fiber unit of the present invention is quickly laid by an air blow fiber system in a PE pipe having an inner diameter of 6 mm, which is twisted three times in a CV triplex cable using 2.2 kV to 6.6 kV, for example. be able to.
【００２２】[0022]
【発明の効果】以上説明したように、本発明によれば、
均一な表面粗さを有する発泡被覆層を通常の押出し条件
で安定して形成することができ、圧送特性および生産性
に優れたエアブローファイバシステム用光ファイバユニ
ットを提供することができる。As described above, according to the present invention,
A foam coating layer having a uniform surface roughness can be stably formed under ordinary extrusion conditions, and an optical fiber unit for an air blow fiber system having excellent pumping characteristics and productivity can be provided.
【図１】図１は本発明の実施例の光ファイバユニットを
示す斜視図である。FIG. 1 is a perspective view showing an optical fiber unit according to an embodiment of the present invention.
１………光ファイバ心線 ２………ポリエステルひも ３………共通被覆層 ４………発泡被覆層 1 ... Optical fiber core 2 Polyester string 3 Common coating layer 4 Foam coating layer
───────────────────────────────────────────────────── フロントページの続き (72)発明者 塩野 武男 神奈川県川崎市川崎区小田栄２丁目１番１ 号 昭和電線電纜株式会社内 (72)発明者 植松 晃 神奈川県川崎市川崎区小田栄２丁目１番１ 号 昭和電線電纜株式会社内 (72)発明者 佐野 清一郎 神奈川県川崎市川崎区小田栄２丁目１番１ 号 昭和電線電纜株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Takeo Shiono Inventor Takeo Shiono 2-1-1 Oda Sakae, Kawasaki-ku, Kanagawa Prefecture 1st-1st Showa Cable Electric Co., Ltd. (72) Inventor Seiichiro Sano 2-1-1 1-1 Oda Sakae, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Showa Cable Electric Co., Ltd.
Claims (1)
して発泡プラスチック層を設けてなる光ファイバユニッ
トにおいて、前記発泡プラスチック層を構成する発泡プ
ラスチック材料は 1〜30PHR のフィラーを含有すること
特徴とする光ファイバケーブルの光ユニット。1. In an optical fiber unit in which a foamed plastic layer is provided on a plurality of optical fiber cores via a common coating layer, the foamed plastic material forming the foamed plastic layer contains a filler of 1 to 30 PHR. A characteristic optical fiber cable optical unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3628291A JP3113296B2 (en) | 1991-03-01 | 1991-03-01 | Optical fiber unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3628291A JP3113296B2 (en) | 1991-03-01 | 1991-03-01 | Optical fiber unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0588057A true JPH0588057A (en) | 1993-04-09 |
| JP3113296B2 JP3113296B2 (en) | 2000-11-27 |
Family
ID=12465433
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3628291A Expired - Lifetime JP3113296B2 (en) | 1991-03-01 | 1991-03-01 | Optical fiber unit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3113296B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010044254A (en) * | 2008-08-14 | 2010-02-25 | Nippon Telegr & Teleph Corp <Ntt> | Optical indoor cable and method of laying optical indoor cable |
-
1991
- 1991-03-01 JP JP3628291A patent/JP3113296B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010044254A (en) * | 2008-08-14 | 2010-02-25 | Nippon Telegr & Teleph Corp <Ntt> | Optical indoor cable and method of laying optical indoor cable |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3113296B2 (en) | 2000-11-27 |
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