According to the designed material sheet, the raw materials are weighed and mixed evenly in a mixer. The main raw materials of glass are: quartz sand, limestone, feldspar, soda ash, boric acid and so on.
The main raw materials of glass are: quartz sand, limestone, feldspar, soda ash, boric acid and so on.Glass production process includes batching, melting, forming, annealing and other processes
The glass has undergone intense temperature changes and shape changes during forming, leaving a thermal stress in the glass. This thermal stress will reduce the strength and thermal stability of glass products. If it is cooled directly, it is likely to rupture in the course of cooling, during or after storage, transportation, and use (commonly known as cold blasting of glass). In order to eliminate the cold explosion phenomenon, glass products must be annealed after forming. Annealing is to preserve or slow down a temperature for a period of time in order to eliminate or reduce the thermal stress in the glass to the allowable value.
Melting, the raw materials will be prepared by high temperature heating, forming a homogeneous bubble free liquid glass. This is a complex process of physics and chemistry. The melting of glass is carried out in a furnace. There are two main types of Furnaces: one is a crucible kiln, the other is glass in the crucible, and the other is heated outside the crucible. The small crucible kiln has only one crucible, and the larger one can be more than 20 crucibles. The crucible kiln is made by gap type, and now only optical glass and color glass are produced by crucible kiln. The other is the tank furnace. The frit is molten in the bath, and the flame is heated on the upper part of the glass. The glass melting temperature mostly in the 1300~1600 C Eve joy. Most of them are heated by flame and a few are heated by electric current. They are called electric furnaces. Now, the pool kiln is continuous production, small pool kiln can be a few meters, big can be more than 400 meters
