Optical cable strengthening core and manufacture method thereof

Abstract

The invention discloses a VU (ultraviolet light source) cured KEVLAR optical cable strengthening core. The strengthening element is prepared in such a way that the KEVLAR used as a base body enters a die hole to be extruded, stretched and cured into an elastic rod-shaped base body with the thickness of 0.3-5mm after being soaked by a UV curing agent, and a layer of special flexible epoxy resin with the thickness of 0.1-1mm, which is a bending resistant material, is cured on the elastic rod-shaped base body; the optical cable strengthening core is commonly applied in parallel and symmetrical sheath cable bodies; and one or more optical fibers all adopt insensitive optical fibers with the diameter of 250 microns. By synthesizing with the process technology, the optical cable adopting the strengthening core achieves the practical effects of high strength and folding resistance.

Description

Technical field: [0001] The invention relates to a strengthening core member widely used in communication optical cable structures. In particular, the invention relates to a reinforcing core and method of a high-strength anti-folding optical cable prepared by epoxy resin UV (ultraviolet light source) curing aramid fibers. 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. Once they are damaged, they will immediately suffer serious economic losses. Therefore, certain measures are 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 current optical cable products usually include two parts: the cable core and the outer sheath of the cable core. During us...

AI Technical Summary

Problems solved by technology

[0003] The current optical cable products usually include two parts: the cable core and the outer sheath of the cable core. During use, the optical cable body often encounters low tensile force and poor bending resistance, which can easily cause the optical fiber in the cable body to break and be interrupted. transmission of information

[0004] Since the optical fiber in the cable body is mainly composed of high-purity quartz glass, its physical properties of tensile and bending resistance are very fragile, so ordinary optical cables can easily cause optical fiber breakage in the cable body during installation and use. Main Obstacles to FTTH and Application Popularization

[0005] Similarly, such as 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 it is resistant to stretching and bending. The physical properties are also very fragile, so it is very easy to cause fiber breakage and damage during installation

In order to overcome the above-mentioned shortcomings, the industry has made a lot of efforts, including inventing an optical cable protected by an aramid reinforcing core that is currently on the market instead of glass fibers on both sides of the optical fiber. Aramid fiber is used as reinforcement material, epoxy resin is thermally cured as matrix material, and thermoplastic PE is used as sheath material. For example, Chinese patent CN200410017783.0, the epoxy resin thermally cured aramid fiber cable reinforcement core adopts the above structure , and its diameter is about 0.4mm-0.8mm. The aramid fiber optic cable reinforcement core with epoxy resin heat curing process can improve the overall tensile strength of the cable to a certain extent, and ensure that the fiber optic cable is due to the aromatic fiber in the cable body during construction and use. The high-strength tensile performance of the aramid fiber is not easy to be broken, thereby protecting the optical fiber in the cable from being pulled and broken, but the unique brittleness of the reinforced core of the aramid fiber cable in the epoxy resin thermosetting process, and its bending resistance is poor. When encountering knotting, bending, extrusion, etc., the above-mentioned aramid fiber reinforced core still cannot effectively protect the optical fiber in the cable body.

The main reason is analyzed: the R angle of the optical fiber at the bending fracture is less than 1 mm, and the two parallel epoxy resin thermosetting process aramid fiber reinforcing cores in the sheath are folded in half when the optical cable is bent at a small angle due to the brittleness of the thermosetting process. Due to the small cross-sectional size of the indoor optical cable, the sheath of the cable body has insufficient elasticity and cannot quickly return to a straight state, thus causing the optical fiber in the cable body to break. The epoxy resin in the commonly used indoor wiring optical cable is thermally cured The main function of the technical aramid fiber reinforcement core is to enhance the tensile force of the cable body and prevent the cable from being pulled and broken, but its fatal weakness is that it is easy to break and lose the elasticity of straightening when the bending radius is too small (less than 30 mm).

Due to the non-affinity physical characteristics of aramid fiber to adhesive substances other than epoxy resin, the existing epoxy resin thermosetting process aramid fiber optic cable reinforcement core is fundamentally insurmountable, and the bending angle is small and easy to break, etc. Achilles' heel

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