All-dry micro-bundle optical cable

An all-dry, optical cable technology, applied in the field of optical cables, which can solve the problems of large outer diameter, peeling or migration of the coloring layer, leakage of the sheath, etc., and achieves the effects of stable performance, efficient and fast construction, and increased space ratio.

Pending Publication Date: 2019-11-08
JIANGSU ZHONGTIAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The use of ointment filling may have the following problems: 1) The ointment mainly contains silicone oil, which is a general chemical synthesis product with low natural degradation ability and is easy to pollute the environment for a long time; 2) During the installation and use of optical cables, the ointment is troublesome to clean, Usually, it needs to be treated with organic solvents, which is not environmentally friendly and has low efficiency; 3) The contact between the ointment and the coloring layer of the optical fiber may easily cause the coloring layer to fall off or migrate, making it difficult to distinguish, resulting in difficulty in connection; 4) When the temperature changes, the viscosity of the ointment will change. 5) The contact area between the ointment and the sheath of the micro-bundle tube is large, and the filling volume of the ointment exceeds 85% of the inner diameter of the micro-bundle tube, and leakage of the sheath may occur for a long time
6) In the prior art, multiple micro-bundle tubes are usually directly stranded, and the product fiber density is low and the outer diameter is large

Method used

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  • All-dry micro-bundle optical cable

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] In this example, the number of optical fiber cores of a kind of easy-to-peel dry-type optical fiber microtube 20 is 6 cores, as figure 1 shown.

[0052] There are 6 optical fibers in each optical fiber microtube 20. The colors of the optical fibers 2 are blue, orange, green, brown, gray, and white. The optical fibers are G.652D optical fibers. Adopt SZ twist.

[0053] Each optical fiber microtube 20 contains a 300D water-blocking yarn 3, the water-blocking yarn 3 has a linear density of 30,000m / kg, and performance selection requirements: tensile strength ≥ 12N, elongation at break ≥ 12%, thermal shrinkage ≤ 3.5%, expansion rate ≥ 25ml / g / min, expansion rate ≥ 30ml / g, water content ≤ 8%. In this case, it is a water-absorbing fiber containing acrylate, and its matrix is ​​mainly polyester or nylon.

[0054] The wall thickness of the microtube sheath 1 is 0.1mm, and the material of the microtube sheath 1 is a mixture of linear low-density polyethylene, carbon black and s...

Embodiment 2

[0057] In this example, the number of optical fiber cores of an easy-stripping dry-type optical fiber microtube 20 is 12.

[0058] There are 12 optical fibers 2 in each microtube 20. The colors of the optical fibers 2 are blue, orange, green, brown, gray, white, red, black, yellow, purple, pink, and turquoise. The optical fibers are G.657A2 optical fibers. The diameter of the coating is 200 μm±10 μm, and the optical fiber in the microtube 20 adopts SZ stranding.

[0059] Each microtube 20 contains one piece of 300D water-blocking yarn 3, the linear density of water-blocking yarn 3 is 30,000m / kg, and the performance selection requirements: tensile strength ≥ 12N, elongation at break ≥ 12%, thermal shrinkage ≤ 3.5 %, expansion rate ≥ 25ml / g / min, expansion rate ≥ 30ml / g, water content ≤ 8%. In this example, it is a water-absorbing fiber cured with polyacrylic acid and acrylate, and its matrix is ​​mainly polyester or nylon.

[0060] The wall thickness of the microtube sheath 1 ...

Embodiment 3

[0063] An easy-stripping dry-type optical fiber microtube 20, the number of optical fiber cores is 12.

[0064] There are 12 optical fibers 2 in each microtube 20. The colors of the optical fibers 2 are blue, orange, green, brown, gray, white, red, black, yellow, purple, pink, and turquoise. The optical fibers 2 are G.657A2 optical fibers. The diameter of the coating is 250 μm ± 10 μm, and the optical fiber 2 adopts SZ stranding in the microtube sheath 1 .

[0065] Each microtube 20 contains a 600D water-blocking yarn 3, the density of the water-blocking yarn 3 is 15,000m / kg, and the performance selection requirements: tensile strength ≥ 20N, elongation at break ≥ 12%, thermal shrinkage ≤ 3.5% , expansion rate ≥ 30ml / g / min, expansion rate ≥ 40ml / g, water content ≤ 8%. In this example, it is a water-absorbing fiber containing acrylic acid graft copolymer, and its matrix is ​​mainly polyester or nylon.

[0066] The wall thickness of the microtube sheath 1 is 0.2mm, and the mat...

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Abstract

The invention provides an all-dry micro-bundle optical cable which comprises a microtube core, an outer sheath wrapping the periphery of the microtube core and a plurality of reinforcing pieces embedded in the outer sheath. The microtube core comprises a plurality of wound microtubes and a plurality of waterproof yarns, and gaps among the wound microtubes are filled with the waterproof yarns; eachwound microtube comprises a winding belt and a plurality of dry-type optical fiber microtubes wrapped by the winding belt, wherein each dry-type optical fiber microtube consists of a microtube sheathand waterproof yarns and optical fibers wrapped in the microtube sheath. The all-dry micro-bundle optical cable adopts an all-dry type structure, is filled with no oil, is environmentally friendly and free of pollution, and has high efficiency and rapidness in construction; after several dry-type optical fiber microtubes are wound and combined through the winding belt, the density of the opticalfibers and the space ratio of the optical fibers in an inner cavity of the sheath can be effectively improved; the dry-type waterproof material has stable performance with the temperature change, theoptical fiber transmission characteristic does not change with the temperature change, and the performance is stable.

Description

technical field [0001] The invention relates to the technical field of optical cables, in particular to an all-dry micro-bundle optical cable. Background technique [0002] Micro-bundle optical cables are generally used in urban backbone networks, and are usually laid in outdoor pipes or overhead. Therefore, there are special requirements for the water resistance of the optical cable, and the optical cable must prevent longitudinal water seepage. The main structure of the micro-bundle optical cable includes a micro-bundle tube and an outer sheath. The micro-bundle tube contains at least one optical fiber, and at least one strengthening member is embedded in the sheath. In order to meet the water resistance of the entire section of the optical cable, not only the cavity between the outside of the micro-bundle tube and the sheath needs to be water-resistant, but also the inside of the micro-bundle tube must be filled with water-blocking materials. Usually, the water-blocking ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/44C08L23/08C08K3/04C08K3/36C08K3/22C08K3/34
CPCC08K3/04C08K3/36C08K3/22C08L23/0869C08K2003/2227C08L2205/025G02B6/44384C08L23/0815C08L23/0853C08K3/346
Inventor 汪趁时李新建缪威玮陆杰周华李强
Owner JIANGSU ZHONGTIAN TECH CO LTD
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