Layer stranded optical cable, preparation method thereof and device for method

Abstract

The invention relates to a layer stranded optical cable, a preparation method thereof and a device for the method, belonging to the technical field of optical fibers and optical cables. The layered stranded optical cable comprises a cable core, a protective layer coated outside the cable core and a jacket layer extruded and coated outside the protective layer, wherein the cable core comprises a central reinforcer and more than two loose casings twisted with the central reinforcer; the central reinforcer is formed by a steel wire coated with grease on the external wall and a plastic cushion layer extruded and coated outside the steel wire; and the loose casings respectively contain a plurality of optical fibers. The layered stranded optical cable is characterized in that a groove is formed on the external wall of the steel wire; and the plastic cushion layer is embedded into the groove. The invention can ensure that the fine combination of the plastic cushion layer and the steel wire can be guaranteed to avoid the longitudinal water seepage of the cable core under the premise that the grease coated outside the steel wire is not required to be eliminated; the groove is formed on the surface of the steel wire capable of forming the central reinforcer before entering a plastic extruding machine for the plastic cushion layer so that the plastic cushion layer is reliably combined with the steel wire by utilizing the groove; and an added steel wire grooving machine has simple structure and has no interference to other machinery.

Description

technical field [0001] The invention belongs to the technical field of optical fiber and cable, in particular relates to a layer-stranded optical cable, and also relates to a preparation method of the layer-stranded optical cable and a device used in the method. Background technique [0002] With the development of the communication industry, optical cables are widely used in the field of communication due to the large amount of information transmitted. There are roughly three types of optical cable structures used in the field of communication: one is the layer twisted optical cable; the second is the central beam tube optical cable; the third is the skeleton optical cable. [0003] The layered optical cable is to add the colored optical fiber and ointment to the loose tube made of high modulus plastic at the same time. Core) twisted to make a cable core, and the cable core is added with protective materials to obtain a loose-tube stranded optical cable. The main features...

AI Technical Summary

Problems solved by technology

However, steel wire manufacturers usually apply a layer of grease on the outside of the steel wire in order to prevent the steel wire from rusting, and when the optical cable manufacturer squeezes the plastic cushion on the steel wire coated with grease, in order to ensure the bonding effect between the plastic cushion and the steel wire, To avoid water seepage in the longitudinal direction, an open flame is usually used to burn off the grease coated on the outside of the steel wire. This method obviously has the problem of taking care of one thing and losing the other. To a certain extent, the steel wire and the plastic cushion will not slide relative to each other, and the water resistance is ideal; the so-called loss means that after the grease is removed, the anti-rust effect of the steel wire will be seriously affected, and the use of an open flame to remove the grease will affect the environment. , and there are unsafe hidden dangers. Although using chemical methods such as using a degreasing agent to remove the grease outside the steel wire can avoid the unsafe hidden danger of burning the grease with an open fire (causing a fire), it will also cause the steel wire to rust, and the degreasing agent is used to remove the grease. Also environmentally unfavorable, in addition to increased process steps and costs for cable production

[0009] To sum up, the industry is currently in a dilemma for the disposal of the steel wire as the central reinforcement, because if the grease applied on the outside of the steel wire is kept and directly squeezed to cover the plastic cushion, the surface of the steel wire is extremely smooth, and the plastic cushion and the steel wire They cannot be tightly bonded for a long time, and it is easy to cause water seepage in the optical cable lengthwise, which will eventually affect the performance of the optical cable.

In addition, because the ambient temperature of the optical cable is constantly changing objectively, and the steel wire and the plastic cushion extruded outside the steel wire are different in material and have different coefficients of thermal expansion and contraction. When the ambient temperature changes greatly, it often causes The separation between the plastic cushion and the steel wire will cause water to penetrate and damage the performance of the cable; and because if the grease applied to the outside of the steel wire is removed, the anti-rust effect of the steel wire will disappear, and the steel wire will gradually rust. Mechanical stretching of the cable The power is seriously affected, so that the product cannot meet the standard requirements

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