Double layer co-extrusion method for extremely micro air-blowing optical cable, and the extremely micro air-blowing optical cable

Abstract

The invention relates to a double layer co-extrusion method for an extremely micro air-blowing optical cable. The method comprises optical fiber storage, optical fiber coloring, secondary coating, SZ intertwist, an oversheath process and a secondary coating process, wherein PC materials and PBT materials are respectively dried and extruded through different extruding machine units; through different distribution cones and channels in the unit heads, the PC materials are extruded from the inner layer of each loose tube; and the PBT materials are extruded from the outer layer of each loose tube. The double layer co-extrusion method utilizes the PC material and PBT material double layer co-extrusion technology to prepare an extremely micro air-blowing optical cable, and can enable the loose tubes of the optical cable to have the advantages of the two types of materials. By means of accurate control of the technical parameters, the double layer co-extrusion method can realize limit control of the geometric dimension of the optical cable and reduce the external diameter of the optical cable to the minimum theoretically, and has the advantages of being high in intensity of the optical cable, being small in the cable diameter and being light in mass, and is the best choice for air-blowing laying.

Description

technical field [0001] The invention belongs to the technical field of optical cable manufacturing, in particular to an air-blown optical cable, and in particular to a double-layer co-extrusion process method for an ultra-miniature air-blown optical cable and an ultra-miniature air-blown optical cable prepared by the method. Background technique [0002] With the continuous development of optical networks, the shortage of pipeline resources has become increasingly prominent. The application of air-blown optical cables has successfully solved the problem of shortage of pipeline resources. The traditional air-blown optical cable is difficult to meet the needs of current applications. With the development of air-blown micro-cable technology, high fiber density, small cable diameter, and light weight will inevitably become the trend of air-blown micro-cable technology. The structural size of traditional air-blown micro-cable products can no longer meet the current laying require...

AI Technical Summary

Problems solved by technology

[0002] With the continuous development of optical networks, the shortage of pipeline resources has become increasingly prominent. The application of air-blown optical cables has successfully solved the problem of shortage of pipeline resources. The traditional air-blown optical cable is difficult to meet the needs of current applications

With the development of air-blown micro-cable technology, high fiber density, small cable diameter, and light weight will inevitably become the trend of air-blown micro-cable technology. The structural size of traditional air-blown micro-cable products can no longer meet the current laying requirements. Demand, smaller size, easier to air-blown miniature air-blown optical cable is what is needed now

[0003] In the existing layer-stranded air-blown optical cable manufacturing technology, the secondary coating layer of the loose tube is generally extruded from a single layer of PBT. The material and the secondary coating formed by the extrusion process determine the resistance of the loose tube. The lateral pressure performance and the anti-pressure performance of the loose tube limit the wall thickness of the loose tube, which in turn limits the diameter of the loose tube, and the micro air-blown optical cable cannot reach the theoretical limit

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