In the radiation furnace, the glass surface by radiation heat transfer effect of the upper heating element and lower surfaces of the ceramic roller by radiation, conduction heat transfer effect, accompanied by natural convection heat transfer effect. In a forced convection oven, on the glass surface of the hot gas stream mainly by convective heat transfer effect, but also by radiation heat transfer effect of the heating element, the lower surface of the ceramic roller by radiation, conduction heat transfer effect, but also by hot air convective heat transfer effect.

Glass enters the furnace, the glass is poor conductor of heat, the inner and outer layer forming temperature gradients, thermal expansion of the outer layer of the glass at this time, the inhibition by the inner glass surface of the compressive stress generated temporarily, the center layer is a tensile stress. Due to the high compressive strength of the glass, the initial glass heated generally not broken. The thermal conductivity of the glass at high temperatures increase, as the temperature of the glass is further increased, a temperature gradient is gradually reduced inner and outer layers. When the temperature exceeds the melting temperature of the glass surface, the surface stress relaxation, internal tensile stress also decreases when the temperature of the glass inner and outer layers consistent stress disappear within glass, glass can be quenching process.

When the glass into the radiation furnace, the lower surface of the glass comes into contact with high-temperature ceramic roller, while heat conduction, composite conduction and convection of heat radiation, rapid temperature rise; on the surface of the glass is only subjected to thermal radiation, temperature rise slower. Under the glass surface of the expansion ratio of the surface of large, so the glass would produce bend upward, glass weight of glass in the middle area of the support and the rollers movement of the glass in the middle region generating optical damage, commonly known as "steel White Road", which is the initial glass heated the upper and lower surfaces of the heat generated by the uneven defect, require the operator to adjust the heating parameters.