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Electromagnetic shielded communication cables for rail transit

A technology for rail transit and communication cables, which is applied in communication cables, insulated cables, cables, etc. It can solve the problems that the flame-retardant sheath cannot effectively block heat transfer, the cable electromagnetic shielding performance is not good, and the function of transmitting information is lost. Achieve good mechanical properties, shielding, high magnetic permeability, and improve mechanical properties

Active Publication Date: 2017-08-25
JIANGSU HENGTONG WIRE & CABLE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the fire-resistant performance of the commonly used rail transit communication cables is mainly improved by flame-retardant improvement of the outer sheath of the cable. The flame-retardant sheath cannot effectively block heat transfer. The heat will penetrate into the optical fiber and other materials with the passage of time and the high temperature of the fire. The fiber is heated and the attenuation changes greatly. It is difficult for the optical cable to maintain the smooth communication of the optical fiber for a long time. Therefore, rail transit communication cables can no longer rely solely on low-smoke halogen-free sheath materials to maintain their fire resistance
[0004] Because the cables and signal cables used for rail transit laying are diversified, and various cables will be gathered together, which will cause electromagnetic signal interference. If the electromagnetic shielding performance of the cable is not good, it will affect signal transmission. Double improvement in the structure and materials to improve the electromagnetic shielding performance of communication cables

Method used

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  • Electromagnetic shielded communication cables for rail transit
  • Electromagnetic shielded communication cables for rail transit
  • Electromagnetic shielded communication cables for rail transit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] refer to figure 1As shown, a communication cable is disclosed in Embodiment 1, and its structure includes from outside to inside: a low-smoke halogen-free outer sheath 10, a first refractory layer 20, a high magnetic permeability steel tape armor layer 30, a low-smoke Halogen-free inner sheath 40, second refractory layer 50, aluminum sheath 60, PE heat insulation layer 70, water blocking layer 80, aluminum-plastic composite tape 90, shielding layer 100, several stranded insulated core wires 101, the above stranded The insulated core wire 101 is covered by a wrapping polyester tape 103, the above-mentioned stranded insulated core wire 101 and the above-mentioned wrapped polyester tape 103 are filled with ointment 104, and the outside of the above-mentioned stranded insulated core wire 101 is covered with an insulating layer , the above-mentioned shielding layer 100 is used as the first layer of shielding for the core wire of the communication cable, and the above-mention...

Embodiment 2

[0060] The structure of the communication cable in embodiment 2 is the same as in embodiment 1, and the polyester film material formula is as shown in table 4:

[0061] The material formula of polyester film in table 4 embodiment 2

[0062] components Content (parts by weight) polyethylene terephthalate 65 Polypropylene 38 carbon fiber 3 nickel powder 3 Titanate coupling agent 0.06

[0063] Wherein, the melt index of the above-mentioned polypropylene is 3.0g / min, the above-mentioned carbon fiber is PAN-based carbon fiber, the length of the above-mentioned carbon fiber is 7 μm, the particle size of the above-mentioned nickel powder is 4 μm, and the above-mentioned titanate coupling agent includes titanate coupling Agent NDZ-102 and titanate coupling agent TMC-TTS.

[0064] Titanate coupling agent NDZ-102 carries out surface treatment to above-mentioned carbon fiber, and the consumption of titanate coupling agent NDZ-102 is 1% of th...

Embodiment 3

[0078] The structure of the communication cable in embodiment 3 is the same as in embodiment 1, and the polyester film material formula is as shown in table 7:

[0079] The material formula of polyester film in table 7 embodiment 2

[0080] components Content (parts by weight) polyethylene terephthalate 65 Polypropylene 38 carbon fiber 3 nickel powder 3 Titanate coupling agent 0.06

[0081] Wherein, the melt index of the above-mentioned polypropylene is 3.0g / min, the above-mentioned carbon fiber is PAN-based carbon fiber, the length of the above-mentioned carbon fiber is 7 μm, the particle size of the above-mentioned nickel powder is 4 μm, and the above-mentioned titanate coupling agent includes titanate coupling Agent NDZ-102 and titanate coupling agent TMC-TTS.

[0082] Titanate coupling agent NDZ-102 carries out surface treatment to above-mentioned carbon fiber, and the consumption of titanate coupling agent NDZ-102 is 1% of th...

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Abstract

The invention discloses an electromagnetic shielding communication cable for a rail transit, wherein the shielding layer is polyester film; formula of the polyester film material includes polyethylene terephthalate, polypropylene, carbon fiber, nickel powder, and titanate coupling agent; the polypropylene can improve fluidity and physical performance of the whole resin; the nickel powder is high in magnetic permeability and good in shielding effect; moreover, the carbon fiber and the nickel powder are processed by the titanate coupling agent, thus chemical activity of carbon fiber is improved and dispersing property of the nickel body in polymer is also improved; the polyester film is good in both physical performance and shielding property.

Description

technical field [0001] The invention relates to the field of rail transit cables, in particular to an electromagnetic shielding communication cable for rail transit. Background technique [0002] Rail transit has the characteristics of dense concentration of people, large flow of people, and restrictions on the entrance and exit of passages. Therefore, affected by the particularity of the rail transit environment, the safety requirements for rail transit construction are the highest. Once a fire occurs in rail transit, the power communication system will be interrupted immediately, and all lighting and communication will be interrupted. It is necessary for the communication cable to have good fire-resistant characteristics, effectively improve the overload capacity of the line, especially in the event of a fire, to ensure the integrity of the line within a certain period of time, and to meet the emergency treatment of firefighting. In addition to the high requirements for th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B7/17H01B7/29H01B7/295H01B7/18H01B11/00C08L67/02C08L23/06C08L51/06C08L23/12C08L83/07C08K9/04C08K7/06C08K3/08C08K7/24C08K3/32C08K5/523C08K13/02C08K3/34
CPCC08J5/18C08J2367/02C08J2423/12C08K3/346C08K13/02C08K2201/003C08K2201/004C08K2201/014C08L23/06C08L67/02C08L2201/02C08L2201/22C08L2203/16C08L2203/202H01B7/17H01B7/18H01B7/292H01B7/295H01B11/00C08L23/12C08K9/04C08K7/06C08K2003/0862C08L51/06C08K7/24C08K2003/323C08K5/523C08L83/04
Inventor 吴士杰陆春良宋志斌谭言秦冯成梁保富吴涛
Owner JIANGSU HENGTONG WIRE & CABLE TECH
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