Infrared is also called "infrared light". In the electromagnetic spectrum, electromagnetic radiation with a wavelength between red light and microwave. Beyond the range of visible light, the wavelength is longer than that of red light, which has significant thermal effect. Infrared drying technology makes use of its unique thermal effect. The infrared ray is easily absorbed by the object, and it has the characteristics of radiation, penetration and electromagnetic wave. It has special affinity for polar substances, such as water molecules. It goes deep into the interior of the material and is transformed into the internal energy of the object, so that the object can obtain the heat energy required for drying in a very short time. The internal and external functions at the same time, which can more effectively and completely remove the combined water in the material, So as to achieve a more ideal drying effect, so as to avoid energy loss caused by heating heat transfer media, which is beneficial to energy saving. At the same time, infrared ray is easy to produce, good controllability, rapid heating and short drying time.
The wavelength range of
infrared is about 0.75nm to 1000nm, which is named because its wavelength is outside the red light wavelength (about 0.6Nm to 0.75nm). Infrared ray is the most important thermal ray in the conventional industrial thermal range below 2000 ℃.
People sometimes divide
infrared into several small areas such as "near infrared", "medium infrared" and "far infrared". The so-called far, medium and near refers to the relative distance from red light in the electromagnetic spectrum. Infrared radiation belongs to thermal radiation. Some basic concepts of thermal radiation are applicable to the process of infrared radiation heat transfer.
