JP2023149038A - Optical fiber protective metal tube and method of manufacturing the same - Google Patents
Optical fiber protective metal tube and method of manufacturing the same Download PDFInfo
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- JP2023149038A JP2023149038A JP2022057369A JP2022057369A JP2023149038A JP 2023149038 A JP2023149038 A JP 2023149038A JP 2022057369 A JP2022057369 A JP 2022057369A JP 2022057369 A JP2022057369 A JP 2022057369A JP 2023149038 A JP2023149038 A JP 2023149038A
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- metal tube
- optical fiber
- synthetic resin
- manufacturing
- tube
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- 239000002184 metal Substances 0.000 title claims abstract description 83
- 239000013307 optical fiber Substances 0.000 title claims abstract description 60
- 230000001681 protective effect Effects 0.000 title claims abstract description 10
- 238000004519 manufacturing process Methods 0.000 title claims description 15
- 229920003002 synthetic resin Polymers 0.000 claims abstract description 31
- 239000000057 synthetic resin Substances 0.000 claims abstract description 31
- 238000000034 method Methods 0.000 claims description 17
- 238000010438 heat treatment Methods 0.000 claims description 5
- 230000003287 optical effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 239000000835 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
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 229920013716 polyethylene resin Polymers 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Landscapes
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
Abstract
Description
本発明は、光ファイバ保護金属管及びその製造方法に関する。 The present invention relates to an optical fiber protection metal tube and a method for manufacturing the same.
光ファイバケーブルは、金属管の中に光ファイバが挿通されている構造が一般的である。光ファイバケーブルは、特許文献１のように、金属管の外側面は合成樹脂で被覆されている場合が多いが、内側面は金属のままであり、その中に光ファイバが挿通されている。 Optical fiber cables generally have a structure in which an optical fiber is inserted into a metal tube. In optical fiber cables, as in Patent Document 1, the outer surface of a metal tube is often coated with synthetic resin, but the inner surface remains metal, into which the optical fiber is inserted.
光ファイバケーブルを切断すると、金属管の切断面に金属のバリが生じ、これを放置していると内部の光ファイバを傷つけるので、切断後に管とファイバの間に合成樹脂製の保護チューブを挿入する作業が必要となる。この作業は時に煩雑であるため、このような作業が不要な光ファイバケーブルが望まれていた。 When cutting an optical fiber cable, metal burrs will form on the cut surface of the metal tube, which will damage the internal optical fiber if left untreated, so insert a synthetic resin protective tube between the tube and fiber after cutting. This requires work to be done. Since this work is sometimes complicated, there has been a desire for an optical fiber cable that does not require such work.
そこで、本願の実施態様は、光ファイバケーブルを切断したときに、金属のバリが生じてもそれが内部の光ファイバを直接傷つけることのない光ファイバ保護金属管及びその製造方法の提供を課題とする。 Therefore, an object of the embodiments of the present application is to provide an optical fiber protective metal tube and a method for manufacturing the same, in which metal burrs do not directly damage the internal optical fibers even if metal burrs are generated when an optical fiber cable is cut. do.
本願の実施態様は、内部に光ファイバを収容して保護する光ファイバ保護金属管であって、金属管と、前記金属管の内側面に密着する合成樹脂製の内被を備えることを特徴とする。 An embodiment of the present application is an optical fiber protection metal tube that accommodates and protects an optical fiber therein, and is characterized by comprising a metal tube and an inner cover made of synthetic resin that tightly adheres to the inner surface of the metal tube. do.
本願の実施態様の光ファイバ保護金属管は、内側面に密着する合成樹脂製の内被を備えている。これにより、内部に光ファイバが挿通された状態で切断された際、金属管の切断面に生ずるバリが内被で被覆されるので、内部の光ファイバにバリが接触することがない。 The optical fiber protection metal tube of the embodiment of the present application includes an inner sheath made of synthetic resin that tightly adheres to the inner surface. As a result, when the metal tube is cut with an optical fiber inserted therein, burrs generated on the cut surface of the metal tube are covered with the inner cover, so that the burrs do not come into contact with the optical fiber inside.
なお、本願の実施態様の光ファイバ保護金属管は、金属管の損傷及び腐食防止のため、前記金属管の外側面が合成樹脂製の外被で被覆されていることが望ましい。 In addition, in the optical fiber protection metal tube of the embodiment of the present application, in order to prevent damage and corrosion of the metal tube, it is preferable that the outer surface of the metal tube is covered with a synthetic resin jacket.
本願の実施態様の光ファイバ保護金属管の製造方法は、金属管の中に合成樹脂管を挿入した状態で、前記金属管を伸張させて細径化し、前記金属管の内側面に合成樹脂製の内被を密着させることを特徴とする。 In the method for manufacturing an optical fiber protection metal tube according to an embodiment of the present application, a synthetic resin tube is inserted into a metal tube, the metal tube is stretched to have a smaller diameter, and a synthetic resin tube is attached to the inner surface of the metal tube. It is characterized by the fact that the inner covering of the
本願の実施態様の製造方法で製造された光ファイバ保護金属管は、内側面に密着する合成樹脂製の内被を備えている。これにより、内部に光ファイバが挿通された状態で切断された際、金属管の切断面に生ずるバリが内被で被覆されるので、内部の光ファイバにバリが接触することがない。 The optical fiber protection metal tube manufactured by the manufacturing method according to the embodiment of the present application includes an inner sheath made of synthetic resin that is in close contact with the inner surface. As a result, when the metal tube is cut with an optical fiber inserted therein, burrs generated on the cut surface of the metal tube are covered with the inner cover, so that the burrs do not come into contact with the optical fiber inside.
なお、本願の実施態様の光ファイバ保護金属管の製造方法は、前記金属管の伸張は、引抜加工によることが望ましい。またこの引抜加工の際、同時に加熱も行われることが望ましい。 In addition, in the method for manufacturing an optical fiber protection metal tube according to an embodiment of the present application, it is preferable that the metal tube is expanded by drawing. Further, during this drawing process, it is desirable that heating is also performed at the same time.
本願の実施態様は上記のように構成されているので、光ファイバケーブルを切断したときに、金属のバリが生じてもそれが内部の光ファイバを直接傷つけることのない光ファイバ保護金属管を製造し、提供することができる。 Since the embodiment of the present application is configured as described above, an optical fiber protection metal tube is manufactured that does not directly damage the internal optical fiber even if metal burrs are generated when the optical fiber cable is cut. and can be provided.
以下、本願の実施形態を図面を参照しつつ説明する。なお、以下で説明する図面は模式図であり、構成同士の位置関係や大きさの比率は実物とは同じであるとは限らない。 Embodiments of the present application will be described below with reference to the drawings. Note that the drawings described below are schematic diagrams, and the positional relationships and size ratios of the structures are not necessarily the same as the actual ones.
図１は、本願の実施形態の光ファイバ保護金属管１０の構造を示す模式図である。光ファイバ保護金属管１０は、図示しない光ファイバを収容して保護するものである。金属管２０は長尺（たとえば、全長１０ｍ以上）に形成された可撓性の、たとえばステンレス製の鋼管であり、その外側面は合成樹脂製の外被４０により被覆されている。外被４０は、金属管２０の損傷及び腐食防止のために設けられる。また、金属管２０の内側面には、合成樹脂製の内被３０が密着している。内被３０及び外被４０の材質は合成樹脂であれば特に問わないが、ポリエチレン樹脂、ポリプロピレン樹脂又はポリ塩化ビニル樹脂が好ましい。 FIG. 1 is a schematic diagram showing the structure of an optical fiber protection metal tube 10 according to an embodiment of the present application. The optical fiber protection metal tube 10 accommodates and protects an optical fiber (not shown). The metal tube 20 is a flexible steel tube made of stainless steel, for example, formed in a long length (for example, a total length of 10 m or more), and its outer surface is covered with a synthetic resin jacket 40. The jacket 40 is provided to prevent damage and corrosion of the metal tube 20. Furthermore, an inner sheath 30 made of synthetic resin is in close contact with the inner surface of the metal tube 20. The material of the inner cover 30 and outer cover 40 is not particularly limited as long as it is a synthetic resin, but polyethylene resin, polypropylene resin, or polyvinyl chloride resin is preferable.
本実施形態の光ファイバ保護金属管１０の製造方法の一例を、図２及び図３を参照しつつ説明する。まず、図２に示すように、所定の内径の金属管２０の中に、金属管２０の内径より小さい外径の合成樹脂管３５を挿入する。 An example of the method for manufacturing the optical fiber protection metal tube 10 of this embodiment will be described with reference to FIGS. 2 and 3. First, as shown in FIG. 2, a synthetic resin tube 35 having an outer diameter smaller than the inner diameter of the metal tube 20 is inserted into the metal tube 20 having a predetermined inner diameter.
この状態で、金属管２０を、たとえばダイスに通して引き抜く引抜加工により伸張させて細径化すると、挿入された合成樹脂管３５も同時に伸張されることで細径化される。その結果、図３に示すように、合成樹脂管３５は金属管２０の内側面に密着して内被３０となる。この状態から金属管２０の外側面を外被４０で被覆すれば、図１に示す光ファイバ保護金属管１０となる。ここで、引抜加工の際に発生する加工熱により、合成樹脂管３５が軟化するため、後に冷却されると合成樹脂管３５は金属管２０に密着する。なお、合成樹脂管３５を金属管２０に確実に密着させるために、引抜加工と同時に電磁誘導加熱又は高周波誘導加熱を施し、合成樹脂の融点付近への加熱を促してもよい。 In this state, when the metal tube 20 is stretched and reduced in diameter by, for example, drawing through a die, the inserted synthetic resin tube 35 is simultaneously stretched and reduced in diameter. As a result, as shown in FIG. 3, the synthetic resin tube 35 comes into close contact with the inner surface of the metal tube 20 to form the inner jacket 30. If the outer surface of the metal tube 20 is covered with the jacket 40 from this state, the optical fiber protection metal tube 10 shown in FIG. 1 will be obtained. Here, the synthetic resin tube 35 is softened by the processing heat generated during the drawing process, so that the synthetic resin tube 35 comes into close contact with the metal tube 20 when it is cooled later. In order to ensure that the synthetic resin tube 35 is in close contact with the metal tube 20, electromagnetic induction heating or high frequency induction heating may be performed simultaneously with the drawing process to promote heating near the melting point of the synthetic resin.
本実施形態の光ファイバ保護金属管１０の製造方法の別の例を、図４及び図５を参照しつつ説明する。まず、図４に示すように、所定の内径の金属管２０の中に、金属管２０の内径より小さい外径の合成樹脂管３５を挿入する。合成樹脂管３５には、図示しないコンプレッサが接続されている。 Another example of the method for manufacturing the optical fiber protection metal tube 10 of this embodiment will be described with reference to FIGS. 4 and 5. First, as shown in FIG. 4, a synthetic resin tube 35 having an outer diameter smaller than the inner diameter of the metal tube 20 is inserted into the metal tube 20 having a predetermined inner diameter. A compressor (not shown) is connected to the synthetic resin pipe 35.
この状態で、合成樹脂管３５の内部にコンプレッサで加圧しつつ、合成樹脂管３５を構成する合成樹脂の融点以上に金属管２０を加熱すると、図５に示すように、合成樹脂管３５は膨張して金属管２０の内側面に接触する。この状態で金属管２０を冷却すると、合成樹脂管３５は膨張した状態で固化して、金属管２０の内側面に密着した内被３０となる。この状態から金属管２０の外側面を外被４０で被覆すれば、図１に示す光ファイバ保護金属管１０となる。 In this state, when the metal tube 20 is heated above the melting point of the synthetic resin constituting the synthetic resin tube 35 while pressurizing the inside of the synthetic resin tube 35, the synthetic resin tube 35 expands as shown in FIG. and comes into contact with the inner surface of the metal tube 20. When the metal tube 20 is cooled in this state, the synthetic resin tube 35 solidifies in an expanded state and becomes the inner sheath 30 that is in close contact with the inner surface of the metal tube 20. If the outer surface of the metal tube 20 is covered with the jacket 40 from this state, the optical fiber protection metal tube 10 shown in FIG. 1 will be obtained.
上記の各方法にて製造されたこの光ファイバ保護金属管１０には、適宜の本数の光ファイバや、必要に応じ抗張力繊維又は介在が挿入されて、光ファイバケーブルとなる。 An appropriate number of optical fibers and, if necessary, tensile strength fibers or an intervening material are inserted into the optical fiber protection metal tube 10 manufactured by each of the above-mentioned methods to form an optical fiber cable.
この光ファイバ保護金属管１０を用いた光ファイバケーブルは、使用状態や用途に応じて適宜の長さで切断される。この切断の際、金属管２０の断面にはバリが生ずるが、このバリは、内被３０が介在することで光ファイバに直接接することない。このため、光ファイバケーブルの切断に伴い、金属管と光ファイバとを隔てる保護チューブ等を断端に挿入する必要なく、光ファイバはバリにより損傷を被ることがなくなる。 An optical fiber cable using this optical fiber protection metal tube 10 is cut into an appropriate length depending on the usage condition and application. During this cutting, burrs are generated on the cross section of the metal tube 20, but these burrs do not come into direct contact with the optical fiber due to the presence of the inner sheath 30. Therefore, when the optical fiber cable is cut, there is no need to insert a protective tube or the like that separates the metal tube and the optical fiber into the cut end, and the optical fiber is not damaged by burrs.
なお、本願の実施形態の光ファイバ保護金属管は、上述した方法で製造されることには限定されず、他の方法で製造されることとしてもよい。 Note that the optical fiber protection metal tube of the embodiment of the present application is not limited to being manufactured by the method described above, and may be manufactured by other methods.
１０ 光ファイバ保護金属管 ２０ 金属管 ３０ 内被
３５ 合成樹脂管 ４０ 外被
10 Optical fiber protection metal tube 20 Metal tube 30 Inner jacket 35 Synthetic resin tube 40 Outer jacket
Claims (5)
金属管と、
前記金属管の内側面に密着する合成樹脂製の内被を備えることを特徴とする、光ファイバ保護金属管。 An optical fiber protection metal tube that houses and protects an optical fiber inside,
metal tube and
An optical fiber protective metal tube, comprising an inner cover made of synthetic resin that is in close contact with the inner surface of the metal tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2022057369A JP2023149038A (en) | 2022-03-30 | 2022-03-30 | Optical fiber protective metal tube and method of manufacturing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2022057369A JP2023149038A (en) | 2022-03-30 | 2022-03-30 | Optical fiber protective metal tube and method of manufacturing the same |
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| Publication Number | Publication Date |
|---|---|
| JP2023149038A true JP2023149038A (en) | 2023-10-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| JP2022057369A Pending JP2023149038A (en) | 2022-03-30 | 2022-03-30 | Optical fiber protective metal tube and method of manufacturing the same |
Country Status (1)
| Country | Link |
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| JP (1) | JP2023149038A (en) |
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2022
- 2022-03-30 JP JP2022057369A patent/JP2023149038A/en active Pending
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