Application of high frequency induction heating in optical cable manufacturing

Optical fiber communication technology has brought booming opportunities to the communication field, and optical technology has begun to penetrate the entire communication network. The demand for optical cables is very large. The use of new processes and new technologies in the manufacturing of optical cables will have great economic and social benefits in reducing product costs, improving product quality, and ensuring user requirements. The traditional production method of optical cables is the optical cable ladle glue injection method, which is now produced by high-frequency induction annealing. Strict requirements for the water permeability of optical cables are an important performance indicator, and the overlap of steel strips in steel-clad optical cables is prone to water seepage. Traditional production uses hot melt glue to make the overlap of the steel strips completely bonded to prevent water seepage. However, there are some problems in the traditional production method. For example, insufficient glue addition will cause water seepage, and excessive glue addition will cause packets to occur during sheath extrusion. Therefore, it is difficult to control the amount of glue added manually. In addition, the polyester film on the surface of the steel strip is not firmly adhered and accumulates in the mold core, causing the sheath to come out of the package. Optical cable production adopts new high-frequency heating technology. When the steel strip is heated by high-frequency induction, the polyester film on the surface of the steel strip is heated and melted to achieve the water-blocking effect of the steel strip overlap.

Compared with traditional hot melt adhesive methods, high-frequency induction heating methods are more prominent. High-frequency induction annealing equipment is four times cheaper than hot melt adhesive.

Although hot melt adhesive does not consume water, the high-frequency heating equipment uses circulating water, which is energy-saving and environmentally friendly.

In terms of appearance, the hot melt adhesive method is easy to come out of the package, but the high-frequency heating method will not come out of the package.

In terms of operation, the high-frequency heating method is particularly simple and does not require long-term professional training for operators.