There are two kinds of glass fiber production processes: two-forming-drawing method, one-time forming-pool kiln drawing method.
There are many processes in the drawing process. The glass material is first melted into a glass ball at a high temperature, and then the glass ball is secondarily melted, and the glass fiber strand is formed by high-speed drawing. This kind of process has various disadvantages such as high energy consumption, unstable molding process and low labor productivity, which is basically eliminated by large glass fiber manufacturers.
The pool kiln drawing method melts raw materials such as pyrophyllite into a glass solution in a kiln, removes the bubbles, transports them to the porous drain plate through the passage, and pulls the glass fiber strands at high speed. The kiln can be connected to hundreds of drain plates through multiple channels for simultaneous production. The process is simple, energy-saving and consumption-reducing, stable in formation, high-efficiency and high-yield, and is convenient for large-scale and fully automated production, and has become an international mainstream production process. The glass fiber produced by the process accounts for more than 90% of the global production.