1. Electromagnetic heating--Electromagnetic heating generates an alternating magnetic field through a component of an electronic circuit board. When placed on a ferrous container, the surface of the container is cut by alternating magnetic lines of force and alternating at the metal part at the bottom of the container. The current (ie, eddy current), the eddy current causes the iron atoms at the bottom of the container to move at high speed and irregularly, and the atoms collide with each other and friction to generate heat energy. Thereby the effect of heating the article. Because the iron container itself is hot, all thermal conversion rates are particularly high, up to 95%. Induction cookers, electromagnetic cookers are all using electromagnetic heating technology.
2. Infrared heating - The heat transfer form of infrared light is radiation heat transfer, which transfers energy by electromagnetic waves. When the far infrared rays are irradiated to the heated object, a part of the rays are reflected back and a part is penetrated. When the emitted far-infrared wavelength coincides with the absorption wavelength of the object to be heated, the heated object absorbs far-infrared rays. At this time, the molecules and atoms inside the object "resonate" - generating strong vibration, rotation, and vibration and rotation The temperature of the object rises and the purpose of heating is achieved.
3. Resistance heating - A method of heating a billet by using a current to discharge heat through an electric heater. Common resistance wire heating, ceramic heaters, and resistance ring heating, quartz tube heating, in principle, are resistive heating.