Production process of glass fiber

There are two production processes of glass fiber: twice forming crucible wire drawing method and once forming tank furnace wire drawing method.
The crucible wire drawing process has many processes. First, the glass raw materials are melted into glass balls at high temperature, then the glass balls are melted again, and the high-speed wire drawing is made into glass fiber strands. This process has many disadvantages, such as high energy consumption, unstable molding process and low labor productivity, and is basically eliminated by large glass fiber manufacturers. The tank furnace wiredrawing method is used to melt pyrophyllite and other raw materials into glass solution in the furnace. After bubbles are removed, they are transported to the porous drain plate through the channel and are drawn into glass fiber precursor at high speed. The kiln can connect hundreds of leak plates through multiple channels for simultaneous production. This process is simple in process, energy saving and consumption reducing, stable in forming, efficient and high-yield, which is convenient for large-scale full-automatic production and has become the international mainstream production process. The glass fiber produced by this process accounts for more than 90% of the global output.