JPS6273213A - Fire retardant optical fiber core - Google Patents

Fire retardant optical fiber core

Info

Publication number
JPS6273213A
JPS6273213A JP60214083A JP21408385A JPS6273213A JP S6273213 A JPS6273213 A JP S6273213A JP 60214083 A JP60214083 A JP 60214083A JP 21408385 A JP21408385 A JP 21408385A JP S6273213 A JPS6273213 A JP S6273213A
Authority
JP
Japan
Prior art keywords
optical fiber
crystallization
sheath
water
secondary coating
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.)
Pending
Application number
JP60214083A
Other languages
Japanese (ja)
Inventor
Tsunemi Tsunoda
角田 恒巳
Kazuo Sanada
和夫 真田
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.)
Fujikura Ltd
Japan Atomic Energy Agency
Original Assignee
Fujikura Ltd
Japan Atomic Energy Research Institute
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 Fujikura Ltd, Japan Atomic Energy Research Institute filed Critical Fujikura Ltd
Priority to JP60214083A priority Critical patent/JPS6273213A/en
Publication of JPS6273213A publication Critical patent/JPS6273213A/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/44Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
    • G02B6/4401Optical cables
    • G02B6/4429Means specially adapted for strengthening or protecting the cables
    • G02B6/4436Heat resistant

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
  • Surface Treatment Of Glass Fibres Or Filaments (AREA)

Abstract

PURPOSE:To improve fire retardance and radiation resistance without spoiling an excellent transmission characteristic, low temp. characteristic, side pressure characteristic, etc. by compounding a metallic oxide having water of crystallization with either or both of secondary covering and sheath. CONSTITUTION:An optical fiber core 5 is provided with a primary coating 2 consisting of modified silicone rubber or urethane acrylic resin curable by UV rays on a bare optical fiber 1. The secondary coating 6 formed by compounding the metallic oxide having the water of crystallization with the silicone rubber or the epoxy acrylic resin curable by UV rays is provided on the primary coating 6 and further the sheath 7 formed by compounding the metallic oxide having the water of crystallization with a nylon resin such as nylon 12 or nylon 11 is provided thereon. Hydrates having the water of crystallization are selected for all of the metallic oxides, for which Al2O3.5H2O, MgO2.2 H2O, etc. are adequately used. The compounding ratio of the metallic oxide by 100pts.wt. silicone rubber or epoxy acrylic resin curable by UV rays in the secondary coating 6 is set in a 10-50pts.wt. range.

Description

【発明の詳細な説明】 「産業上の利用分野」 この発明は、難燃性、耐放射線性に優れた光ファイバ心
線に関するものである。
DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to an optical fiber core having excellent flame retardancy and radiation resistance.

「従来の技術」 光ファイバ心線としては、これまで種々の構造のものが
提案されているが、低温特性、側圧特性などの点で現在
図面に示すような構造のものが標準的になりつつある。
``Prior art'' Various structures have been proposed for optical fiber cores, but the structure shown in the drawing is currently becoming standard in terms of low-temperature characteristics, lateral pressure characteristics, etc. be.

図面に示した光ファイバ心線は、光ファイバ裸線1上に
変性シリコーンゴムもしくは紫外線硬化型ウレタンアク
リル樹脂からなる一次被覆2が設けられ、この−次被覆
2上にシリコーンゴムもしくは紫外線硬化型エポキシア
クリル樹脂からなる二次被覆3が設けられ、さらにこの
上にナイロン12、ナイロン11などのナイロン樹脂か
らなるシース4が設けられてなるものである。
The optical fiber core shown in the drawing has a bare optical fiber 1 covered with a primary coating 2 made of modified silicone rubber or UV-curable urethane acrylic resin, and this secondary coating 2 coated with silicone rubber or UV-curable epoxy. A secondary coating 3 made of acrylic resin is provided, and a sheath 4 made of nylon resin such as nylon 12 or nylon 11 is further provided thereon.

「発明が解決しようとする問題点」 しかしながら、この構造の光ファイバ心線にあっては、
良好な伝送特性、低温特性、側圧特性などを有するにも
かかわらず、易燃焼性であるという欠点を持っている。
``Problems to be solved by the invention'' However, in the optical fiber core wire with this structure,
Although it has good transmission characteristics, low temperature characteristics, lateral pressure characteristics, etc., it has the drawback of being easily flammable.

ちなみに、上記構成の心線では酸素指数が約18である
Incidentally, the core wire with the above configuration has an oxygen index of about 18.

このため、この光ファイバ心線は火災等の危険のある場
所での使用には、不適当であり、難燃性の付与が望まれ
るところである。
For this reason, this optical fiber is unsuitable for use in places where there is a risk of fire or the like, and it is desired that it be made flame retardant.

また、上記構成の心線は、耐放射性が十分でなく、原子
炉施設等での使用にも特別の配慮が必要であっに0 「問題点を解決するための手段」 そこで、この発明にあっては、二次被覆およびシースの
いずれか一方もしくは両方に結晶水を有する金属酸化物
を配合することにより、上記優れた伝送特性、低温特性
、側圧特性等をそこなうことなく、難燃性、耐放射線性
を改善するようにした。
In addition, the core wire with the above structure does not have sufficient radiation resistance and requires special consideration when used in nuclear reactor facilities. By blending a metal oxide with water of crystallization into either or both of the secondary coating and sheath, flame retardancy and resistance can be achieved without impairing the above-mentioned excellent transmission characteristics, low temperature characteristics, lateral pressure characteristics, etc. Improved radioactivity.

1作用」 本発明にあっては、火災時に、二次被覆およびシースの
いずれか一方もしくは両方に配合した結晶水を有する金
属酸化物に含まれる結晶水が蒸発して、耐燃焼性を高め
るとともに、金属酸化物の遮蔽効果により、耐放射線性
をも向上させる。
1. In the present invention, in the event of a fire, the crystal water contained in the metal oxide containing crystal water blended into either or both of the secondary coating and the sheath evaporates, improving the flame resistance and , radiation resistance is also improved due to the shielding effect of metal oxides.

「実施例」 以下、先の図面を利用して、本発明の難燃化光ファイバ
心線を詳しく説明する。
"Example" Hereinafter, the flame-retardant optical fiber core wire of the present invention will be described in detail using the previous drawings.

図中符号5は、難燃化光ファイバ心線(以下、光ファイ
バ心線と略称する。)である。この例の光ファイバ心線
5は、図面に示すように、光ファイバ裸線1上に変性シ
リコーンゴムもしくは紫外線硬化型ウレタンアクリル樹
脂からなる一次被覆2が設けられ、この−次被覆2上に
シリコーンゴムもしくは紫外線硬化型エポキシアクリル
樹脂に結晶水を有する金属酸化物を配合してなる二次被
覆6が設けられ、さらにこの上にナイロンI2、ナイロ
ン11などのす/ロン樹脂に結晶水を有する金属酸化物
を配合してなるシース7が設けられてなるものである 上記金属酸化物としては、いずれも結晶水を有する水化
物が選ばれ、具体的には、AI、h3・5H20、Mg
O2・2H20などが好適に用いられるが、これに限定
されるものではない。そして、二次被覆6において、シ
リコーンゴムもしくは紫外線硬化型エポキシアクリル樹
脂100重貴部に対する金属酸化物の配合量は、10〜
50重量部の範囲とされる。lO重量部未嵩のものでは
、得られる光ファイバ心線5の難燃性が十分得られず、
また50重量部を越えるものでは、この二次被覆6が緩
衝層としての機能を果たせず、さらに得られる光ファイ
バ心線5の難燃性が過剰なものとなり、不経済である。
Reference numeral 5 in the figure indicates a flame-retardant optical fiber (hereinafter abbreviated as optical fiber). As shown in the drawing, the optical fiber core 5 of this example has a primary coating 2 made of modified silicone rubber or ultraviolet curing urethane acrylic resin on the bare optical fiber 1, and a silicone coating 2 on the primary coating 2. A secondary coating 6 is provided, which is made of a rubber or ultraviolet curable epoxy acrylic resin mixed with a metal oxide having water of crystallization, and further coated with a metal oxide having water of crystallization in a nylon resin such as nylon I2 or nylon 11. The metal oxides to be provided with the sheath 7 containing oxides are selected from hydrates having water of crystallization, specifically, AI, h3.5H20, Mg.
O2.2H20 and the like are preferably used, but are not limited thereto. In the secondary coating 6, the blending amount of the metal oxide is 10 to 100 parts of silicone rubber or ultraviolet curable epoxy acrylic resin.
The range is 50 parts by weight. If the amount of 10% by weight is too low, the resulting optical fiber core 5 will not have sufficient flame retardancy.
If it exceeds 50 parts by weight, the secondary coating 6 will not function as a buffer layer, and the resulting optical fiber core 5 will have excessive flame retardancy, which is uneconomical.

また、二次被覆6の厚さは、50〜100μmの範囲と
され、50μm未満のものでは、緩衝層としての二次被
覆6の機能を果たすことができず、また 100μmを
越えるものでは、厚すぎたものとなり、不経済である。
The thickness of the secondary coating 6 is in the range of 50 to 100 μm; if it is less than 50 μm, the secondary coating 6 cannot function as a buffer layer, and if it exceeds 100 μm, the thickness It is too expensive and uneconomical.

さらに、上記シース7において、ナイロン12、ナイロ
ン11などのナイロン樹脂1.00重量部に対する金属
酸化物の配合量は、10〜50重量部の範囲とされる。
Further, in the sheath 7, the amount of metal oxide blended is in the range of 10 to 50 parts by weight with respect to 1.00 parts by weight of nylon resin such as nylon 12 and nylon 11.

10重量部未満のものでは、二次被覆6と同様に得られ
る光ファイバ心線5の難燃性が十分得られず、また50
重量部を越えるものでは、得られる光ファイバ心線5の
難燃性が過剰なものとなり、不経済である。また、シー
ス7の厚さは、200〜350μmの範囲とされ、20
071m未満のものでは、外部保護層としてのシース7
の機能を果たすことができず、また350μmを越え゛
るものでは、厚すぎたものとなり、上記二次被覆6と同
様、不経済である。
If it is less than 10 parts by weight, the optical fiber core 5 obtained similarly to the secondary coating 6 will not have sufficient flame retardancy, and if it is less than 50 parts by weight,
If it exceeds the weight part, the resulting optical fiber core 5 will have excessive flame retardancy, which is uneconomical. Further, the thickness of the sheath 7 is in the range of 200 to 350 μm, and the thickness of the sheath 7 is 200 to 350 μm.
For those less than 0.71 m, sheath 7 as an outer protective layer
If the thickness exceeds 350 μm, it is too thick and, like the secondary coating 6, is uneconomical.

このような構成からなる光ファイバ心線5にあっては、
二次被覆6およびシース7の両方に結晶水を有する金属
酸化物を配合したので、火災時に、二次被覆6またはシ
ース7内の金属酸化物に含まれる結晶水が蒸発して、光
ファイバ裸線1の伝送損失が加熱により増大するのを防
止するものとなる。さらに、このものは、放射線雰囲気
下においても、光ファイバ裸線の伝送損失増加を最小限
に抑制するものとなる。
In the optical fiber core 5 having such a configuration,
Since both the secondary coating 6 and the sheath 7 contain a metal oxide containing crystal water, in the event of a fire, the crystal water contained in the metal oxide in the secondary coating 6 or the sheath 7 evaporates, leaving the optical fiber bare. This prevents the transmission loss of the wire 1 from increasing due to heating. Furthermore, even in a radiation atmosphere, the increase in transmission loss of the bare optical fiber can be suppressed to a minimum.

また、」二記実施例では、二次被覆6およびシース7の
両方に結晶水を有する金属酸化物を配合したものであっ
たが、これら二次被覆6およびシース7のいずれか一方
に結晶水を有する金属酸化物を配合したものであっても
よい。この場合の光ファイバ心線にあっても、上記実施
例と同様の作用効果を得ることができるものとなる。ま
た、−次被覆2に結晶水を有する金属酸化物を配合した
ものにあっては、その金属酸化物により直接光ファイバ
裸線1が傷付けられ、機械的強度が劣化したものとなる
In addition, in Example 2, both the secondary coating 6 and the sheath 7 contained a metal oxide containing crystal water, but either the secondary coating 6 or the sheath 7 contained crystal water. It may also be a compound containing a metal oxide having the following. Even with the optical fiber in this case, it is possible to obtain the same effects as in the above embodiment. Furthermore, if the secondary coating 2 contains a metal oxide containing water of crystallization, the bare optical fiber 1 is directly damaged by the metal oxide, resulting in a decrease in mechanical strength.

次に、本発明の難燃化光ファイバ心線を製造する方法に
ついて詳述する。例えば、紡糸炉中において、光ファイ
バ母材を加熱し、常法により溶融紡糸して直径約125
71mの光ファイバ裸線Iを得る。
Next, a method for manufacturing the flame-retardant optical fiber core of the present invention will be described in detail. For example, in a spinning furnace, an optical fiber preform is heated and melt-spun using a conventional method to form a fiber with a diameter of about 125 mm.
Obtain 71 m of bare optical fiber I.

次に、紫外線硬化型ウレタンアクリル樹脂槽に上記の光
ファイバ裸線1を通過させ、その表面に上記樹脂を塗布
し、上記槽に設けた口径0.3mmのダイスに挿通し、
波長35[)nmの紫外線を照射して厚さ約70μmの
一次被覆2を設けて光ファイバ素線を得る。このように
して得た光ファイバ素線の一次被覆2上に、紫外線硬化
型エポキシアクリル樹脂100重量部にA Ito 3
・5H,020重量部を配合した後、十分混練して得た
混合物を塗布し、口径0.5mmのダイスで余剰の混合
物を除去する。次に、このものに、波長350nmの紫
外線を照射して厚さ約75μmの二次被覆6を設け、さ
らに、この上に、ナイロン11. 100重量部ニMg
Ot ’ 2Hto  20重量部を配合した後、十分
混練して得た混合物を塗布する。次に、押出機により押
出被覆してシース7を設け、目的の難燃化光ファイバ心
線5を得る。
Next, the bare optical fiber 1 is passed through an ultraviolet curable urethane acrylic resin tank, the resin is applied to its surface, and it is inserted into a die with a diameter of 0.3 mm provided in the tank.
A primary coating 2 having a thickness of approximately 70 μm is provided by irradiating ultraviolet light with a wavelength of 35 [) nm to obtain an optical fiber. On the primary coating 2 of the optical fiber obtained in this way, A Ito 3 was added to 100 parts by weight of an ultraviolet curable epoxy acrylic resin.
- After blending 5H, 020 parts by weight, the mixture obtained by thorough kneading is applied, and the excess mixture is removed using a die with a diameter of 0.5 mm. Next, a secondary coating 6 of approximately 75 μm in thickness is provided on this material by irradiating ultraviolet rays with a wavelength of 350 nm, and further, nylon 11. 100 parts by weight Mg
After blending 20 parts by weight of Ot' 2Hto, the mixture obtained by thorough kneading is applied. Next, a sheath 7 is provided by extrusion coating using an extruder, and the desired flame-retardant optical fiber core 5 is obtained.

また、」二記の製造方法において、二次被覆お上びシー
スのいずれか一方だけに結晶水を有する金属酸化物を配
合することは当然可能である。
In addition, in the manufacturing method described in item 2, it is of course possible to blend a metal oxide having water of crystallization into only one of the secondary coating and the sheath.

(実験例) 以下、実験例を示して本発明の作用効果を明確にする。(Experiment example) Hereinafter, the effects of the present invention will be clarified by showing experimental examples.

(実験例1) 常法により溶融紡糸して得た直径125μmの光ファイ
バ裸線の外周面に紫外線硬化型ウレタンアクリル樹脂か
らなる厚さ70μmの一次被覆を設け、この−次被覆上
に紫外線硬化型エポキシアクリル樹脂1.00重量部に
Alph3・5H205Mg0v・2H,0をそれぞれ
第1表に示した配合比に基すいて配合し混練して得た混
合物からなる二次被覆を設け、さらにこの上にナイロン
l I 、 100重量部にAL03・5H20、Mg
O2・2H30をそれぞれ上記と同様に第1表に示した
配合比に基ずいて配合し混練して得た混合物からなるシ
ースを設けてN011〜7の光ファイバ心線を作製した
。これらの光ファイバ心線を用いて難燃性および低温特
性について調べた。なお、難燃性は酸素指数で表し、低
温特−7= 性は一40℃のときの伝送損失で表し、これらの結果を
第1表に併せて示した。
(Experimental Example 1) A primary coating of 70 μm thick made of UV-curable urethane acrylic resin was provided on the outer circumferential surface of a bare optical fiber with a diameter of 125 μm obtained by melt-spinning by a conventional method, and a primary coating of 70 μm thick made of UV-curable urethane acrylic resin was applied to the secondary coating. A secondary coating consisting of a mixture obtained by blending and kneading Alpha3, 5H205Mg0v, 2H,0 in 1.00 parts by weight of type epoxy acrylic resin based on the compounding ratio shown in Table 1 was provided, and then a secondary coating was provided on top of this. Nylon l I, 100 parts by weight AL03・5H20, Mg
Optical fiber core wires N011 to 7 were prepared by providing sheaths made of mixtures obtained by mixing and kneading O2 and 2H30 in the same manner as above based on the compounding ratios shown in Table 1. The flame retardance and low-temperature properties of these optical fibers were investigated. Incidentally, the flame retardancy is expressed by the oxygen index, and the low-temperature properties are expressed by the transmission loss at -40°C, and these results are also shown in Table 1.

第1表 (A)・・・MgO?・2H20を表し、その単位は重
量部とする。(B)・・・Alz03・5H70を示し
、その単位は重量部とする。
Table 1 (A)...MgO?・Represents 2H20, and its unit is parts by weight. (B)...Alz03.5H70 is shown, and the unit is parts by weight.

第1表からも明らかなように、本発明の条件を満たすも
の(No。1〜6)は、従来(No、 7 )のものに
比べて優れた難燃性、低温特性を有するものであること
がわかる。
As is clear from Table 1, those that meet the conditions of the present invention (No. 1 to 6) have superior flame retardancy and low-temperature properties compared to the conventional ones (No. 7). I understand that.

(実験例2) 実験例■で作製したNo、1〜7の光ファイバ心線につ
いて、放射線照射中における損失増加量(照射特性)及
びその放射線照射10時間後の損失増加量(回復特性)
を下記のような条件で測定した。
(Experiment Example 2) Increase in loss during radiation irradiation (irradiation characteristics) and increase in loss after 10 hours of radiation irradiation (recovery characteristics) for optical fiber core wires No. 1 to 7 produced in Experiment Example ■
was measured under the following conditions.

(イ)照射特性試験:0.85μmの発光ダイオードと
パワーメータを使用し、1011R/Hの線量率で5時
間照射して総線量5X106Rに達したときの損失増加
量を調べた。
(a) Irradiation characteristics test: Using a 0.85 μm light emitting diode and a power meter, irradiation was performed for 5 hours at a dose rate of 1011R/H to examine the amount of increase in loss when a total dose of 5×106R was reached.

(ロ)回復特性試験二上記照射試験終了後、試験対象を
線源から離し10時間後の損失増加量を調べた。
(b) Recovery Characteristic Test 2 After the completion of the above irradiation test, the test subject was removed from the radiation source and the increase in loss was examined 10 hours later.

上記(イ)(ロ)の各試験結果を第2表に示した。The test results of (a) and (b) above are shown in Table 2.

(以下余白) 第2表 第2表から明らかなように、本発明の条件を満たすもの
(No、 1〜6 )は、従来(No、 7 )のもの
に比べて優れた照射特性、回復特性を有するものである
ことがわかる。
(Left below) Table 2 As is clear from Table 2, those that meet the conditions of the present invention (No. 1 to 6) have better irradiation characteristics and recovery characteristics than the conventional ones (No. 7). It can be seen that it has the following.

また、第1表、第2表から明らかなように、本発明の条
件を満たすもの(No、 I〜6)のうち、二次被覆と
シースとの両方にMgO2・2H,0を配合したもの(
No、 3 )が最も優れた難燃性および耐放射線特性
を有するものであることがわかる。
Furthermore, as is clear from Tables 1 and 2, among those that satisfy the conditions of the present invention (No. I to 6), those that contain MgO2.2H,0 in both the secondary coating and the sheath. (
It can be seen that No. 3) has the most excellent flame retardancy and radiation resistance properties.

「発明の効果」 本発明は、光ファイバ裸線上に順次、合成樹脂からなる
一次被覆、二次被覆およびシースを被覆してなる光ファ
イバ心線において、上記二次被覆およびシースのいずれ
か一方もしくは両方に結晶水を有する金属酸化物を配合
したことにより、優れた伝送特性、低温特性、側圧特性
等をそこなうことなく、難燃性、耐放射線性を改善する
ことができる。
"Effects of the Invention" The present invention provides an optical fiber coated wire in which a bare optical fiber is sequentially coated with a primary coating, a secondary coating, and a sheath made of a synthetic resin. By blending metal oxides having water of crystallization in both, flame retardance and radiation resistance can be improved without impairing excellent transmission characteristics, low temperature characteristics, lateral pressure characteristics, etc.

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

図面は、本発明に係る難燃化光ファイバ心線の一例を示
す概略断面図である。 1・・・光ファイバ裸線 2・・−次被覆 5・・・難燃化光ファイバ心線 6・・・二次被覆 7・・・シース
The drawing is a schematic cross-sectional view showing an example of a flame-retardant optical fiber core according to the present invention. 1... Bare optical fiber 2... Secondary coating 5... Flame retardant optical fiber core 6... Secondary coating 7... Sheath

Claims (1)

【特許請求の範囲】[Claims] 光ファイバ裸線上に順次、合成樹脂からなる一次被覆、
二次被覆およびシースを被覆してなる光ファイバ心線に
おいて、上記二次被覆およびシースのいずれか一方もし
くは両方に結晶水を有する金属酸化物を配合したことを
特徴とする難燃化光ファイバ心線。
A primary coating made of synthetic resin is sequentially applied to the bare optical fiber.
A flame-retardant optical fiber core comprising a secondary coating and a sheath, characterized in that either or both of the secondary coating and the sheath contain a metal oxide having water of crystallization. line.
JP60214083A 1985-09-27 1985-09-27 Fire retardant optical fiber core Pending JPS6273213A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP60214083A JPS6273213A (en) 1985-09-27 1985-09-27 Fire retardant optical fiber core

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP60214083A JPS6273213A (en) 1985-09-27 1985-09-27 Fire retardant optical fiber core

Publications (1)

Publication Number Publication Date
JPS6273213A true JPS6273213A (en) 1987-04-03

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
JP60214083A Pending JPS6273213A (en) 1985-09-27 1985-09-27 Fire retardant optical fiber core

Country Status (1)

Country Link
JP (1) JPS6273213A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0248607A (en) * 1988-08-11 1990-02-19 Sumitomo Electric Ind Ltd Optical fiber unit
JPH0552804U (en) * 1991-12-24 1993-07-13 昭和電線電纜株式会社 Heat resistant optical fiber
US7155100B2 (en) 2001-11-08 2006-12-26 Dsm Ip Assets B.V. Flame-retardant optical fiber coating composition
US7221841B2 (en) 2003-10-17 2007-05-22 Dsm Ip Assets B.V. Flame retardant UV cured buffered optical fibers and buffer composition
CN104003620A (en) * 2014-05-09 2014-08-27 无锡市华尔泰机械制造有限公司 Sound absorption material for throttling-diffusion combined muffler

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5725306B2 (en) * 1974-01-10 1982-05-28

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5725306B2 (en) * 1974-01-10 1982-05-28

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0248607A (en) * 1988-08-11 1990-02-19 Sumitomo Electric Ind Ltd Optical fiber unit
JPH0552804U (en) * 1991-12-24 1993-07-13 昭和電線電纜株式会社 Heat resistant optical fiber
US7155100B2 (en) 2001-11-08 2006-12-26 Dsm Ip Assets B.V. Flame-retardant optical fiber coating composition
US7221841B2 (en) 2003-10-17 2007-05-22 Dsm Ip Assets B.V. Flame retardant UV cured buffered optical fibers and buffer composition
US7660505B2 (en) 2003-10-17 2010-02-09 Dsm Ip Assets, B.V. Flame retardant UV cured buffered optical fibers and buffer composition
CN104003620A (en) * 2014-05-09 2014-08-27 无锡市华尔泰机械制造有限公司 Sound absorption material for throttling-diffusion combined muffler
CN104003620B (en) * 2014-05-09 2016-05-25 无锡市华尔泰机械制造有限公司 A kind of throttling diffusion composite type silencer sound-absorbing material

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