What is combined glass tempering furnace? What advantages does it have?

Answer:

A combined glass tempering furnace is primarily comprised of loading table, pre-heating section, heating section, tempering section, cooling section, unloading table, and control system. The pre-heating section usually maintains a temperature ranging from 450 to 500 degrees Celsius while the heating section maintains approximately 700 degrees Celsius in the chamber. This type of furnace can be used to temper offline Low-E glass and high grade ordinary glass.

In addition to the relatively low radiation heat transfer efficiency of glass, Low-e glass is highly reflective to radiation heat. In other words, using radiation heating in the pre-heating section will have lower efficiency. On the contrary, heat transfer through forced convection can not only solve this problem, it also reduces heating time effectively by enhancing the heat transfer efficiency.  In the heating section, although radiation heating method has improved performance due to the high temperature in the heating chamber, the reflection of Low-e glass against radiation should not be overlooked. For the purpose of further enhancing evenness and efficiency over ordinary glass, heating section should still adopt forced convection method to strengthen the system configuration and product quality.

Combined glass tempering furnace can minimize the heating time. Primary glass quality issues associated with long heating time in the oven: increased possibility of leaving scratches on the bottom surface of glass and more surface waves, affecting surface quality and optical properties of glass, causing declining in product quality of tempered glass. Combined glass tempering furnace is an excellent solution to this problem. By minimizing the risk of defects during heating process, it achieves maximum productivity while ensuring the quality or the tempered glass.