Indoor wiring optical cable

Abstract

The invention discloses a special anti-tensile and anti-tortuous indoor wiring optical cable with the specification of 2 multiplying 3mm; the indoor wiring optical cable comprises a sheathed cable body, a strengthening piece and optical fibers; the sheathed cable body made of environmentally friendly halogen-free flame retardant high-elastic polyolefin materials is characterized by non-toxic environmentally friendly flame-retardant performances and can be applied to indoor laying; the strengthening piece takes aramid fibers as matrix material which then enters a die hole after being impregnated into the ultra-violet composite liquid, finally the material is extruded, stretched and solidified into 0.5mm rod-shaped matrix, with the tensile force reaching more than 1800MPa; a layer of 0.2mm strengthening core made of high-hardness bending-resistant and flame-retardant PVC high-elastic materials is arranged on the rod-shaped matrix through hot plastic coating; the strengthening core is integrated into the sheathed cable body in a parallel and symmetrical way; the fibers can be one or more in number, with a diameter of 250um; the fibers are made of easily tortuous and insensitive fiber materials; therefore, through the combination of the processes and technologies, the indoor wiring optical cable with the specification of 2 multiplying 3mm achieves special anti-tensile and anti-tortuous practical effects.

Description

Technical field [0001] The invention relates to an indoor wiring communication optical cable with an appearance size of 2×3MM, which is suitable for small-sized optical cables for FTTH terminal wiring. Background technique [0002] With the rapid development of society, people are increasingly dependent on communication networks and information transmission. Communication networks are developing in the direction of large capacity and high density. Therefore, certain measures should be taken to protect the optical cable and strengthen the improvement of the optical cable to ensure the long-term smooth flow and reliability of the communication network. [0003] The optical cable products currently on the market usually include two parts: the cable core and the sheath around the cable core. They often encounter two problems in use. Second, its low tensile strength and poor bending resistance will also cause the optical fiber in the cable body to break and interrupt the transmi...

AI Technical Summary

Problems solved by technology

[0003] The optical cable products currently on the market usually include two parts: the cable core and the sheath around the cable core. They often encounter two problems in use. Second, the low tensile strength and poor bending resistance will also cause the optical fiber in the cable body to break and interrupt the transmission of information.

[0004] Since the main component of the cable core fiber is high-purity quartz glass, its physical properties of tensile and bending resistance are very fragile, so ordinary optical cables can easily break the optical fiber in the sheath during use and installation. The main obstacle to the popularization and application of optical fiber cable to the home

[0005] Similarly, the commonly used indoor 2×3MM small-size optical cable, the main component of the core fiber is also high-purity quartz glass, with a diameter of only 0.25 mm, which is as thick as human hair, and its tensile and bending resistance The physical performance is also very fragile, so it is very easy to cause fiber breakage and damage during installation

In order to overcome the above shortcomings, the industry has made a lot of efforts, including the invention of an optical cable protected by an aramid reinforcing core on both sides of the optical fiber. Due to the high tensile performance of the aramid fiber in the cable body, it is not easy to be broken, thus protecting the optical fiber in the cable from being easily broken, but the strengthening core also has poor bending resistance, and it is knotted and bent during construction. When bending, extrusion, etc., the above-mentioned aramid fiber reinforced core still cannot effectively protect the optical fiber in the cable body

Analysis of the main reasons: the R angle of the optical fiber at the bending fracture is less than 1 mm, and the two parallel strengthening cores in the sheath also break when the cable is bent in half at a small angle. Due to the small cross-sectional size of the indoor optical cable, the cable sheath Insufficient elastic force, unable to quickly restore the straight state, resulting in the breakage of the optical fiber in the cable body. The main function of the aramid fiber reinforcing core in the indoor wiring optical cable commonly used today is to enhance the tensile force of the cable body and prevent the cable from being pulled and broken. But its weakness is that when the bending radius is too small (less than 30 mm), it is easy to break and lose the elasticity of straightening

Therefore, the existing aramid fiber reinforced core material and production process have always had disadvantages such as poor bending resistance and easy breakage of the optical fiber in the cable body for the protected optical cable.

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