Principle: The existing glass tempering process is mostly heated by electric heating wire, and the heat transfer mode is mainly convection. If infrared heating technology is applied to the production of Tempered Glass, the heat transfer mode becomes radiation-based. According to the theoretical calculation, the tempering temperature is 650-700 degrees in the medium temperature zone, and the radiation heat transfer is 7.9 times of the convective heat transfer. Obviously, the infrared heater can be used to save energy during the heating process.
Infrared radiant heater is based on the fact that many materials are easy to absorb infrared rays. The general thermal energy is converted into infrared radiant energy, which is directly radiated onto the heated object, causing the resonance of the object molecules, thereby achieving lower energy and faster speed. Heat the object to the desired temperature. The infrared rays that can pass through the atmosphere are generally divided into three bands: the near-infrared band of 1-2.5 microns; the mid-infrared band of 3-5 microns; and the far-infrared band of 8-13 microns.
The second is to find a suitable infrared radiant heater. The tungsten wire vacuum tube can radiate near infrared rays, and the wavelength does not correspond, so it is not suitable for the Ultra Thick Tempered Glass process. Silicon carbide is a long-wavelength far-infrared radiant heater that not only has a wavelength that does not correspond, but also has a low thermal efficiency and is not suitable. Quartz glass and ceramic infrared heaters can radiate mid-infrared, so it is more suitable. Different types of quartz glass, the structure of the heater is different, and the infrared wavelength of the radiation is also different. According to the characteristics of infrared absorption of tempered glass, it is a very important problem to select and research and develop quartz glass suitable for varieties and infrared heaters with suitable structure. In this way, the infrared radiation wavelength of quartz glass heater can be adjusted to adapt to the infrared of tempered glass. Absorption characteristics to achieve the purpose of improving thermal efficiency.