Three Important Steps Of OPGW Optical Cable Production Process

1. High-speed optical fiber coloring production line

In the construction of electric power dedicated communication network, the number of optical fibers used is usually 12 to 24 cores. With the continuous expansion of system capacity according to new business requirements, the number of cores is gradually increasing, and individual line sections have even increased to 48 to 72 cores; in optical fiber testing, In order to distinguish each optical fiber conveniently during connection and use, the optical fiber is colored. Introduce an advanced high-speed optical fiber coloring production line to ensure that the optical fiber will not fade or migrate during the entire service life. When the number of fiber cores in a stainless steel tube unit exceeds 12, the color ring coloring technology is used to distinguish the fibers.

2. Composite stainless steel tube fiber optic unit production line

Introduced the world's laser welding composite stainless steel tube optical fiber unit production line. The innovation of the process lies in: the use of online excess length control can obtain the ideal excess length of the optical fiber; the presence of an inner plastic tube layer protects the optical fiber from laser beam burns and sharp edge wear of the stainless steel pipe welds; the difference between the stainless steel tube and the inner plastic tube The combination greatly enhances the bending resistance of the loose tube, and the thermal expansion coefficient of the inner plastic tube yields to that of the stainless steel tube, and the fiber excess length is more stable. It has made new progress on the basis of the traditional cold drawing process of pure stainless steel tube.

Among them, the optical fiber pay-off device adopts independent online automatic control of each optical fiber and displays it digitally on the screen. A stainless steel tube optical fiber unit can accommodate 36-core optical fibers or more. Using the principle of non-contact measurement, through the "online The excess length control device "controls the excess length of the entire line of optical fibers in secondary coating production, eliminating the traditional destructive excess length detection and reducing waste.


A layer of thermoplastic PBT lining tube is extruded by the extruder, and full chromatographic fiber and thixotropic water blocking ointment are injected at the same time; the excess length of the fiber is controlled online, and the excess length of the fiber can reach 10‰, and then the extruder is used to place the outer wall of the PBT tube Extrude a layer of high-strength hot melt adhesive.


The edge trimming device cuts the stainless steel strip to the required width. The new edge is more conducive to laser welding; the forming table uses the forming and precise roller positioning to shape and align the thin-walled metal strip. The laser head of the longitudinal pipe welding machine can continuously weld stainless steel on-line. tube. Due to the isolation and protection of the PBT tube, the optical fiber is not affected by high temperature; after the heating device, the adhesive layer is activated and squeezed by the calibration table to bond the stainless steel tube and the inner plastic tube together.

3. Mature OPGW optical cable stranding technology

The key to the OPGW optical cable stranding process lies in the control of armored monofilament pay-off tension, pre-forming, mold, stranding speed, and inner and outer layer pitch. The introduction of high-speed stranding machine, fully automatic tension control, to meet the needs of large-section multi-layer stranding, high-strength OPGW cable structure; another cable stranding machine meets the needs of coil-length OPGW and submarine cable production.