Layer-stranded optical fiber ribbon cable and production process

Abstract

The invention discloses a layer-stranded optical fiber ribbon cable and its production process, which includes a loose tube and an optical fiber unit installed in the loose tube, a central strengthening member is placed inside the stranded loose tubes, and a water blocking belt is placed outside , a metal ribbon and a sheath layer, the optical fiber unit includes a multi-layer bendable optical fiber ribbon, the bendable optical fiber ribbon is a continuous and alternate arrangement of optical fiber bundles and adhesive layers, and the optical fiber bundle is at least two optical fibers passing through The photocurable resin is UV-cured and formed together, and the adhesive layer is a hot-melt adhesive resin layer continuously coated between the optical fiber bundles, so that the optical fiber bundles can be bent along the axial direction of the adhesive layer. The layer-stranded optical fiber ribbon cable prepared by the present invention, because the optical fiber bundle has bendability and mobility in the optical fiber ribbon, thereby improving the duty cycle of the optical fiber in the loose tube and the fiber packing density of the optical fiber in the optical cable, and can reduce the fiber density at the same time. The outer diameter of the optical cable is small, reducing the weight of the optical cable itself, which is beneficial to saving the installation and welding time of the optical fiber ribbon optical cable, and improving the installation and laying efficiency of the optical cable.

Description

technical field [0001] The invention relates to the technical field of communication optical fiber cables, in particular to a layer-stranded optical fiber ribbon cable and a production process. Background technique [0002] Due to the high integration of optical fibers, the compact structure of the optical fiber cable, and less routing resources, it can effectively reduce the cost of optical cable fusion and improve the efficiency of installation and laying. Thanks to these advantages, the optical fiber ribbon cable is used in the metropolitan area network and access network. has been widely used. Stranded optical fiber ribbon cables are generally formed by twisting loose tubes on tensile elements. Each loose tube uses 6-core or 12-core optical fiber ribbons, which are stacked with different numbers of optical fiber ribbons. Due to the layer-stranded The structure is multi-tube twisted, and the number of fiber cores of the optical fiber ribbon cable is large, which can meet...

AI Technical Summary

Problems solved by technology

[0003] At present, the optical fiber ribbon in the optical fiber ribbon cable is prepared by coating the ribbon resin in a mold and cured by UV grooves. After the photocuring, the molecular chains in the ribbon resin are in a "cross-linked and cured" state, and the resin's The UV curing degree is high, which limits the mobility of the fiber bundle in the fiber ribbon; at the same time, the cured resin coating has a high modulus and poor flexibility, and the fiber bundle cannot be effectively bent and crimped in the fiber ribbon; Moreover, the optical fiber ribbons in the loose tube are placed in a "flat-stacked" manner, that is, another layer of optical fiber ribbons is stacked on top of one layer of optical fiber ribbons, which leads to a small duty ratio of the optical fiber in the loose tube, which cannot Effectively reduce the outer diameter of the loose tube and the weight of the cable itself, causing problems such as higher cost of optical fiber ribbon cable, lower installation efficiency, and higher laying costs

Images