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    Energy-saving method in the heating process of toughening film of mobile phone

    Date: 2019-12-26
    Views: 9

    The existing mobile phone steel film process mostly uses electric heating wire heating, heat transfer mode is mainly convection. If infrared heating technology is applied to tempered glass production, the heat transfer mode will be mainly radiation. According to the theoretical calculation, the radiation heat transfer is 7.9 times of the convective heat transfer in the tempering temperature range of 650-700 degrees. It is obvious that the infrared heater can save energy in the heating process.

    Infrared radiation heater is based on the fact that many materials are easy to absorb infrared radiation. It transforms general thermal energy into infrared radiation energy, radiates directly to the heated object, causes the resonance of the molecule of the object, so as to heat the object to the required temperature with lower energy and faster speed. Infrared rays that can penetrate the atmosphere are generally divided into three bands: near infrared band 1-1.6 micron; mid-infrared band 1.6-4 micron; far infrared band 4-13 micron.

    The energy-saving effect of ordinary infrared heater is still not significant because of the wide range of radiation wavelength. In order to improve the thermal efficiency, the radiation wavelength of the infrared radiation heater must be consistent with the absorption wavelength range of the heated material. Therefore, the effective absorption wavelength of the heated material must be found first. Each material has its own special absorption characteristics, that is, its absorption of heat energy at a certain wavelength is higher than that at other bands. According to some data, the effective absorption wavelength range of glass is 2.4-6 micron in general processing technology, and 2.7-3 micron in tempered glass heating process. This is basically in the mid-infrared band and slightly near the near infrared region, which corresponds to 704-843 degrees. If this temperature is not reached, glass can not be tempered well; beyond this temperature, heat energy will be wasted.

    The second is to find suitable infrared radiation heater. Tungsten filament vacuum tube can radiate near infrared radiation with different wavelength, so it is not suitable for tempered glass process. Silicon carbide is a long-wavelength far-infrared radiation heater, which not only does not correspond to the wavelength, but also has low thermal efficiency and is not suitable. Quartz glass and ceramic infrared heaters can radiate mid-infrared radiation, so they are more suitable. Different kinds of quartz glass have different heater structures and infrared radiation wavelength. According to the infrared absorption characteristics of tempered glass, it is a very important problem to select and develop suitable quartz glass and infrared heater with suitable structure. Only in this way can the infrared radiation wavelength of quartz glass heater be adjusted to adapt to the infrared absorption characteristics of tempered glass, so as to achieve the purpose of improving thermal efficiency.

    Another characteristic of infrared radiation heating is that radiation heat transfer does not need medium and can be transmitted in vacuum. Oxygen and nitrogen, the main components of air in the atmosphere, rarely absorb infrared rays, so the energy loss in the process of medium and medium flow is very small. According to thermal calculation, the utilization rate of radiation heat transfer at 700-1000 degrees is 5.7-7.4 times that of convective heat transfer. In addition, infrared radiation heating also has the characteristics of very uniform heating. In order to give full play to this feature, the shape of heater is very important. For Tempered Flat glass, the heating uniformity of tubular heater is not as good as that of plate heater. Practice has proved that the plate heater is more suitable, it is conducive to improving the quality of tempered glass, improving the product yield and used in glazed glass which is more difficult to temper. Therefore, it must be emphasized that the plate heater for tempered flat glass is the best, and any heater requiring reflector is not as effective as the plate glass. Because in most cases, due to the high temperature generated by the heater, the reflecting surface inevitably turns black. After a period of time, the heat radiated from its back makes the reflector become an endotherm.

    In addition, infrared radiation has reflectivity. Installing reflection and focusing parts in heater to make infrared radiation directional and centralized heating is the common method of infrared energy saving.

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