Infrared heating technology is suitable for the welding of complex curved parts and large structural plastic parts. It can melt thermoplastics without touching the product. After infrared welding, the weld seam between the two parts can be 100% gas-tight.
Infrared radiation is divided into short, medium and long waves, each with its own characteristics: short waves, which are more penetrating and can be absorbed inside the material; medium waves, which are shallow and mostly absorbed by the surface of the material; and long waves, which are mostly reflected and very little absorbed by the surface of the material. Therefore, there are two main forms of infrared generators used in the manufacture of instrument panels: quartz glass lamps (short wave) and medium wave.
The glass tube consists of a quartz glass tube with a reflective layer over a tungsten filament. The quartz glass tube has an extremely high infrared penetration rate, is able to work consistently and stably above 1000°C and has good corrosion resistance. At the same time, in order to better concentrate the generator's radiant energy on the heated material, a reflective coating is added to the outer wall of the quartz tube, which allows more than 90% of the infrared light to be directed and radiated in order to increase the infrared heating efficiency.
The surface temperature of the short wave generator can reach 1800 to 2200°C and can be used for welding of plastic parts. Due to the low absorption rate, the thermal radiation penetrates deeper into the material, thus ensuring uniform heating. At the same time, with short wave generators, the rate of reaching the decomposition temperature of the material surface is slower, thus avoiding thermal damage. The surface temperature of the medium wave generator is between 800 and 950°C. As most of the heat radiation is absorbed by the most superficial materials, the medium wave generator is mainly used to heat superficial materials, such as welding of plastic films and drying of paints.
Therefore, it is essential to choose the right infrared generator for different materials and different process methods. The wavelength of the generator should be chosen to match the absorption spectrum of the material, which will make it possible to heat the product faster without any additional environmental or equipment heating. The choice of the right infrared generator can largely reduce the energy consumption of the plant's equipment.
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