JPH0522658B2 - - Google Patents
Info
- Publication number
- JPH0522658B2 JPH0522658B2 JP59249978A JP24997884A JPH0522658B2 JP H0522658 B2 JPH0522658 B2 JP H0522658B2 JP 59249978 A JP59249978 A JP 59249978A JP 24997884 A JP24997884 A JP 24997884A JP H0522658 B2 JPH0522658 B2 JP H0522658B2
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- pfa
- coating layer
- fiber cable
- tetrafluoroethylene
- 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 - Lifetime
Links
- 239000013307 optical fiber Substances 0.000 claims description 33
- 239000011247 coating layer Substances 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 9
- 238000007765 extrusion coating Methods 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 229920001577 copolymer Polymers 0.000 claims description 5
- 238000010583 slow cooling Methods 0.000 claims description 5
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 claims description 4
- 238000001816 cooling Methods 0.000 description 10
- 238000001125 extrusion Methods 0.000 description 7
- 239000010410 layer Substances 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 6
- 238000000465 moulding Methods 0.000 description 5
- 239000004925 Acrylic resin Substances 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 4
- 229920002050 silicone resin Polymers 0.000 description 4
- 229920006367 Neoflon Polymers 0.000 description 3
- 229920006122 polyamide resin Polymers 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- UHESRSKEBRADOO-UHFFFAOYSA-N ethyl carbamate;prop-2-enoic acid Chemical compound OC(=O)C=C.CCOC(N)=O UHESRSKEBRADOO-UHFFFAOYSA-N 0.000 description 2
- 229920000840 ethylene tetrafluoroethylene copolymer Polymers 0.000 description 2
- 239000003365 glass fiber Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 229920001296 polysiloxane Polymers 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000011800 void material Substances 0.000 description 2
- -1 Ethylene-ethylene Chemical group 0.000 description 1
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 229920006351 engineering plastic Polymers 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 229920001038 ethylene copolymer Polymers 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000009970 fire resistant effect Effects 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- KCTAWXVAICEBSD-UHFFFAOYSA-N prop-2-enoyloxy prop-2-eneperoxoate Chemical compound C=CC(=O)OOOC(=O)C=C KCTAWXVAICEBSD-UHFFFAOYSA-N 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- TXEYQDLBPFQVAA-UHFFFAOYSA-N tetrafluoromethane Chemical compound FC(F)(F)F TXEYQDLBPFQVAA-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/05—Filamentary, e.g. strands
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2011/00—Optical elements, e.g. lenses, prisms
- B29L2011/0075—Light guides, optical cables
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Surface Treatment Of Glass Fibres Or Filaments (AREA)
Description
（発明の技術分野）
本発明はテトラフルオロエチレン・パーフルオ
ロアルキルビニルエーテル共重合体からなる押出
被覆層を有する光フアイバケーブルの製造方法に
関する。
（発明の技術的背景とその問題点）
従来から、耐熱用あるいは架空地線用の光フア
イバケーブルとして、光フアイバ素線の外側にシ
リコーン樹脂、ウレタンアクリレート樹脂、ある
いはエポキシ樹脂からなる緩衝層を設け、その上
に機械的保護のために二次被覆層を設けた構造の
ものが知られている。
このような光フアイバケーブルにおける二次被
覆層を構成する材料としては、従来からポリアミ
ド樹脂が主に用いられてきたが、この種の光フア
イバケーブルにも利用分野の拡大とともにより一
層の耐熱性が要求されるようになつてきている。
例えば耐火ケーブル用光フアイバケーブルや光フ
アイバ複合架空地線では、二次被覆層またはケー
ブルシースを構成する材料として、耐寒性や耐熱
性等種々の優れた特性を有するフツ素樹脂（例え
ば、テトラフルオロエチレン・エチレン共重合
体、以下ETFEと称す）が使用され始めている。
特にフツ素樹脂の中でもエンジニアリングプラス
チツクとして最も高い融点を持つ、テトラフルオ
ロエチレン・パーフルオロアルキルビニルエーテ
ル共重合体（以下PFAと称す）は、一般に加工
性の乏しいフツ素樹脂の中にあつて優れた加工性
を有し、かつ耐寒性や耐熱性にも優れているため
注目されているが、このようなPFAを押出被覆
した光フアイバケーブルは、PFAを押出成型す
る際の好適条件、すなわち光伝送損失の増加がで
きるだけ小さくなるような押出条件がいまだ確立
されておらず、品質にばらつきがあり信頼性に乏
しいという難点があつた。
これは、PFAが一般のフツ素樹脂（例えば
ETFE）やポリアミド樹脂等に比べ高結晶性、高
密度であるために、押出被覆後の成型収縮が押出
条件によつて大きなばらつきを生じ、その結果光
伝送損失に大きく影響してくるものと考えられ
る。
（発明の目的）
本発明は以上の点に着目してなされたもので、
PFAの押出被覆による光伝送損失増加がほとん
どない光フアイバケーブルの製造方法を提供しよ
うとするものである。
（発明の概要）
本発明は即ち、１条または複数条の光フアイバ
素線の外周にPFAからなる押出被覆層を設ける
にあたり、前記光フアイバ素線の外周に溶融され
たPFAを引落比60以上120以下で押出被覆した
後、徐冷することを特徴とする光フアイバケーブ
ルの製造方法である。なお、ここで引落比は、成
型ダイスの穴径を仕上り径で割つた値である。
第１図および第２図は、本発明方法により製造
される光フアイバケーブルの構造例を示したもの
である。
第１図において、符号１は光フアイバ素線を示
しており、この光フアイバ素線１は、屈折率の大
きい石英ガラス等からなる中心のコア２と、その
外側に被覆された屈折率の小さい石英ガラス等か
らなるクラツド３から構成されている。
このような構造の光フアイバ素線１の外側に
は、シリコーン樹脂、エポキシアクリレート樹
脂、ウレタンアクリレート樹脂、あるいはブタジ
エンアクリレート樹脂等からなる二層構造の
150μｍ程度の厚さの緩衝層４が設けられており、
その外側には、PFAからなる二次被覆層５が設
けられている。
また、第２図は複合架空地線等に使用される光
フアイバケーブルを示しており、鋼線６を中心に
その外周に６本の光フアイバ素線１が集合され、
その外側に空隙７を残してPFAからなるシース
層８が設けられている。
以下、本発明方法を第１図に示す光フアイバケ
ーブルの製造を例として説明する。
まず、光フアイバ素線１の外側に前述の緩衝層
４を設けた後、その上に溶融されたPFAを引落
比60以上120以下で押出被覆して、押出被覆層を
室温の空気中で徐冷させる。
なお、PFAとしては、例えばネオフロンPFA
（ダイキン工業社商品名）や、テフロンPFA（三
井フロロケミカル社商品名）等が使用される。
このような製造方法によれば、高温で押出され
たPFAの押出後の成型収縮が最小限に抑えられ
るため、優れた被覆化損失特性を有する光フアイ
バケーブルが得られる。
以下、PFAの押出条件を上記のように設定す
るに至つた実験および実験結果について説明す
る。
まず、伝送損失が2.60dB／Km（λp＝0.86μｍ）
の直径125μｍの石英ガラスフアイバの上にネオ
フロンPFA AP−210を、温度350〜400℃、速度
25〜30ｍ／分、引落比30，80、および100で押出
被覆した後、連続的に冷却して直径900μｍの
PFA被覆光フアイバを製造した。
そして引落比を30，80、および100とした場合
に、冷却方法を次の３通りに変えて、その光伝送
損失を測定した。冷却方法は、空冷（徐冷）、温
冷（80℃の温水で冷却）、水冷（20℃の水で急冷）
の３通りである。
結果は、引落比80および100で冷却方法を空冷
（徐冷）とした場合に、光伝送損失増加Δαがそれ
ぞれ0.03dB／Ｋｍ、0.01dB／Ｋｍ（λp＝0.86μ
ｍ）と良好な被覆化損失特性を示した。
表は以上の実験結果をまとめたものである。
(Technical Field of the Invention) The present invention relates to a method for manufacturing an optical fiber cable having an extruded coating layer made of a tetrafluoroethylene/perfluoroalkyl vinyl ether copolymer. (Technical background of the invention and its problems) Conventionally, as optical fiber cables for heat-resistant or overhead ground wires, a buffer layer made of silicone resin, urethane acrylate resin, or epoxy resin has been provided on the outside of the optical fiber wire. , a structure in which a secondary coating layer is provided thereon for mechanical protection is known. Polyamide resin has traditionally been mainly used as the material constituting the secondary coating layer in such optical fiber cables, but as the field of use for this type of optical fiber cable expands, even more heat resistance is required. It is becoming more and more required.
For example, in optical fiber cables for fire-resistant cables and optical fiber composite overhead ground wires, fluororesins (such as tetrafluorocarbon resins) having various excellent properties such as cold resistance and heat resistance are used as materials constituting the secondary coating layer or cable sheath. Ethylene-ethylene copolymer (hereinafter referred to as ETFE) is beginning to be used.
In particular, tetrafluoroethylene perfluoroalkyl vinyl ether copolymer (hereinafter referred to as PFA), which has the highest melting point as an engineering plastic among fluororesins, has excellent processing properties among fluororesins that generally have poor processability. Optical fiber cables coated with PFA by extrusion are attracting attention because of their excellent cold resistance and heat resistance. Extrusion conditions have not yet been established that will minimize the increase in , and there have been problems in that quality has varied and reliability has been poor. This means that PFA is a common fluororesin (e.g.
Because of its high crystallinity and density compared to ETFE) and polyamide resins, the molding shrinkage after extrusion coating varies greatly depending on the extrusion conditions, which is thought to have a large effect on optical transmission loss. It will be done. (Object of the invention) The present invention has been made focusing on the above points,
The present invention aims to provide a method for manufacturing an optical fiber cable in which there is almost no increase in optical transmission loss due to extrusion coating of PFA. (Summary of the Invention) In other words, the present invention provides, when providing an extrusion coating layer made of PFA on the outer periphery of one or more optical fiber strands, molten PFA is applied to the outer periphery of the optical fiber strand at a drawing ratio of 60 or more. This is a method for producing an optical fiber cable, which is characterized by extrusion coating at a temperature of 120 or less and then slow cooling. Note that the drawing ratio here is a value obtained by dividing the hole diameter of the molding die by the finished diameter. 1 and 2 show an example of the structure of an optical fiber cable manufactured by the method of the present invention. In FIG. 1, reference numeral 1 indicates an optical fiber wire, and this optical fiber wire 1 consists of a central core 2 made of quartz glass or the like having a high refractive index, and a core 2 coated on the outside with a low refractive index. It is composed of a cladding 3 made of quartz glass or the like. On the outside of the optical fiber wire 1 having such a structure, there is a two-layer structure made of silicone resin, epoxy acrylate resin, urethane acrylate resin, or butadiene acrylate resin, etc.
A buffer layer 4 with a thickness of about 150 μm is provided,
A secondary coating layer 5 made of PFA is provided on the outside. Further, FIG. 2 shows an optical fiber cable used for a composite overhead ground wire, etc., in which six optical fiber wires 1 are gathered around a steel wire 6 at its center.
A sheath layer 8 made of PFA is provided leaving a void 7 on the outside. Hereinafter, the method of the present invention will be explained by taking as an example the production of an optical fiber cable shown in FIG. First, the above-mentioned buffer layer 4 is provided on the outside of the optical fiber 1, and then molten PFA is extruded and coated thereon at a drawing ratio of 60 to 120, and the extruded coating layer is slowly heated in air at room temperature. Let cool. In addition, as PFA, for example, Neoflon PFA
(product name of Daikin Industries, Ltd.), Teflon PFA (product name of Mitsui Fluorochemicals, Inc.), etc. are used. According to such a manufacturing method, the molding shrinkage of PFA extruded at high temperature after extrusion is minimized, so that an optical fiber cable having excellent coating loss characteristics can be obtained. The experiments and experimental results that led to setting the PFA extrusion conditions as described above will be described below. First, the transmission loss is 2.60dB/Km (λp=0.86μm)
NEOFLON PFA AP-210 on 125μm diameter quartz glass fiber, temperature 350~400℃, speed
After extrusion coating at 25-30 m/min and drawdown ratios of 30, 80, and 100, continuous cooling
A PFA coated optical fiber was manufactured. Then, when the drawdown ratio was set to 30, 80, and 100, the cooling method was changed to the following three methods and the optical transmission loss was measured. Cooling methods include air cooling (slow cooling), hot cooling (cooling with 80℃ hot water), water cooling (quenching with 20℃ water)
There are three ways. The results show that when the cooling method is air cooling (slow cooling) at a drawing ratio of 80 and 100, the optical transmission loss increase Δα is 0.03 dB/Km and 0.01 dB/Km (λp = 0.86μ
m) and showed good coating loss characteristics. The table summarizes the above experimental results.
【表】
以上の結果について、引落比および冷却方法の
違いにより損失特性に大きな差が見られるのは、
PFAが他のフツ素樹脂やポリアミド樹脂等に比
べて密度が大きく、また溶融温度も高いことから
押出直後の成型収縮が極めて大きいためと考えら
れる。
（発明の実施例）
以下、本発明の実施例について記載する。
実施例
直径125μｍ、伝送損失2.60dB／Ｋｍ（λp＝
0.86μｍ）の石英ガラスフアイバ素線の上に溶融
されたXE14−907（東芝シリコーン社製シリコー
ン樹脂の商品名）を塗布した後、その上にOF−
111（信越シリコーン社製シリコーン樹脂の商品
名）を塗布して直径400μｍの一次被覆光フアイ
バを製造した。
次いでその上にネオフロンPFA AP−210を温
度370℃、速度28ｍ／分、引落比100の押出条件で
押出した後、空気中で冷却し、直径900μｍの光
フアイバケーブルを得た（第１図に示す構造を有
する）。
得られた光フアイバケーブルについて被覆化損
失特性を調べたところ、Δα＝0.01dB／Ｋｍ（λp
＝0.86μｍ）と良好な特性を示した。
（発明の効果）
以上説明した本発明の光フアイバケーブルの製
造方法によれば、PFA押出被覆時の成型収縮が
最小限に抑えられるため、被覆化損失特性に優れ
た信頼性の高い光フアイバケーブルを得ることが
できる。[Table] Regarding the above results, there are large differences in loss characteristics due to differences in drawdown ratio and cooling method.
This is thought to be because PFA has a higher density and a higher melting temperature than other fluororesins, polyamide resins, etc., so the molding shrinkage immediately after extrusion is extremely large. (Examples of the invention) Examples of the invention will be described below. Example Diameter 125μm, transmission loss 2.60dB/Km (λp=
After applying molten XE14-907 (trade name of silicone resin manufactured by Toshiba Silicone Co., Ltd.) onto a silica glass fiber wire (0.86μm), OF-
111 (trade name of silicone resin manufactured by Shin-Etsu Silicone Co., Ltd.) was applied to produce a primary coated optical fiber having a diameter of 400 μm. Next, Neoflon PFA AP-210 was extruded on top of it under extrusion conditions of a temperature of 370°C, a speed of 28 m/min, and a drawdown ratio of 100, and then cooled in air to obtain an optical fiber cable with a diameter of 900 μm (see Figure 1). with the structure shown). When we investigated the coating loss characteristics of the obtained optical fiber cable, we found that Δα=0.01 dB/Km (λp
= 0.86 μm), showing good characteristics. (Effects of the Invention) According to the method for manufacturing an optical fiber cable of the present invention described above, molding shrinkage during PFA extrusion coating is minimized, so a highly reliable optical fiber cable with excellent coating loss characteristics can be produced. can be obtained.
第１図は本発明方法により製造される光フアイ
バケーブルの一実施例の構造を示す断面図、第２
図は他の実施例の構造を示す断面図である。
１……光フアイバ素線、２……コア、３……ク
ラツド、４……緩衝層、５……二次被覆層、６…
…鋼線、７……空隙、８……シース層。
FIG. 1 is a sectional view showing the structure of an embodiment of an optical fiber cable manufactured by the method of the present invention, and FIG.
The figure is a sectional view showing the structure of another embodiment. DESCRIPTION OF SYMBOLS 1... Optical fiber wire, 2... Core, 3... Clad, 4... Buffer layer, 5... Secondary coating layer, 6...
...Steel wire, 7...Void, 8...Sheath layer.
Claims (1)
テトラフルオロエチレン・パーフルオロアルキル
ビニルエーテル共重合体からなる押出被覆層を設
けるにあたり、前記光フアイバ素線の外周に溶融
されたテトラフルオロエチレン・パーフルオロア
ルキルビニルエーテル共重合体を引落比60以上
120以下で押出被覆した後、徐冷することを特徴
とする光フアイバケーブルの製造方法。 ２ 徐冷は、押出被覆層が100℃以下になるまで、
室温の空気中で行なわれることを特徴とする特許
請求の範囲第１項記載の光フアイバケーブルの製
造方法。[Scope of Claims] 1. When providing an extrusion coating layer made of a tetrafluoroethylene/perfluoroalkyl vinyl ether copolymer on the outer periphery of one or more optical fiber strands, a molten coating layer made of a tetrafluoroethylene/perfluoroalkyl vinyl ether copolymer is provided on the outer periphery of the optical fiber strand. Tetrafluoroethylene/perfluoroalkyl vinyl ether copolymer with a drawdown ratio of 60 or more
1. A method for producing an optical fiber cable, which comprises extrusion coating at a temperature of 120 or less and then slow cooling. 2. Slow cooling is performed until the extruded coating layer reaches 100℃ or less.
2. The method for manufacturing an optical fiber cable according to claim 1, wherein the method is carried out in air at room temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59249978A JPS61127641A (en) | 1984-11-27 | 1984-11-27 | Production of optical fiber cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59249978A JPS61127641A (en) | 1984-11-27 | 1984-11-27 | Production of optical fiber cable |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61127641A JPS61127641A (en) | 1986-06-14 |
| JPH0522658B2 true JPH0522658B2 (en) | 1993-03-30 |
Family
ID=17201014
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59249978A Granted JPS61127641A (en) | 1984-11-27 | 1984-11-27 | Production of optical fiber cable |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61127641A (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2746628B2 (en) * | 1989-01-09 | 1998-05-06 | 株式会社フジクラ | Method of manufacturing optical fiber coated with fluororesin |
| JP2005070498A (en) * | 2003-08-26 | 2005-03-17 | Asahi Kasei Electronics Co Ltd | Multi-core plastic primary coated optical fiber and its manufacturing method |
| US8960271B2 (en) * | 2010-08-06 | 2015-02-24 | E I Du Pont De Nemours And Company | Downhole well communications cable |
| US20240194371A1 (en) * | 2021-05-05 | 2024-06-13 | 3M Innovative Properties Company | Fluoropolymer compositions comprising fluoropolymer with polymerized unsaturated fluorinated alkyl ether suitable for copper and electronic telecommunications articles |
| WO2022234365A1 (en) * | 2021-05-05 | 2022-11-10 | 3M Innovative Properties Company | Fluoropolymer compositions comprising amorphous fluoropolymer and crystalline fluoropolymer suitable for copper and electronic telecommunications articles |
| US20240209217A1 (en) * | 2021-05-05 | 2024-06-27 | 3M Innovative Properties Company | Fluoropolymer compositions comprising uncrosslinked fluoropolymer suitable for copper and electronic telecommunications articles |
-
1984
- 1984-11-27 JP JP59249978A patent/JPS61127641A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61127641A (en) | 1986-06-14 |
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