In the vacuum heating, can be heated by resistance, induction eddy current heating, laser irradiation heating method. Heat transfer by radiation heat transfer and heat conduction. The microwave heating, heating, induction heating. Infrared heating
Infrared can be divided into three parts, namely, the near infrared wavelength, between 0.75 ～ 1.50 μ m; infrared, between the wavelength of 1.50 ~ 6 μ m; far infrared wavelengths, between 6 ～ l000 μ M. Infrared can be divided into two categories: near infrared and far infrared. Near infrared, short wave infrared, the wavelength of 0.76 ~ 1.5 micron, penetrate human tissue is deep, about 5 ~ 10 mm; far infrared or long wavelength infrared light, the wavelength of 1.5 to 400 microns, by skin absorption, tissue penetration depth is less than 2 mm. The highest frequency of short wave infrared, temperature rise. V = λ f infrared paint using radiation heating, infrared heat lamp to paint surface heating is a heat radiation penetration process, this will make the paint in water and solvent was evaporated in the baking process, does not make the dry paint layer of bubbles and holes, so the baking effect better, can effectively improve the paint surface quality, higher strength and toughness increase film better. Making short wave infrared paint room, his wavelength has a strong penetration, short wave infrared, also called (near infrared), straight into the paint, paint layer is the body (body shell) the rapid temperature rise of self heating effect, coating of water (or solvent) quickly from inside to outside volatile, paint the vibration frequency of the same chemical paint, paint chemical bond due to resonance and increase the amplitude polymerization genes, that the probability of polymerization increases, the molecules by chemical reaction, curing acceleration of paint coating (from the inside and the table with that resonance). Shortwave infrared paint paint paint main advantages: high efficiency, its gloss and plump coating on the surface of high degree, mirror more clear, coating adhesion, simple operation and high safety. So, the shortwave infrared car spray baking real invention, is the twenty-first Century “green products”, “microwave” reputation is known, is the inevitable product of. Making infrared heating advantage and efficiency, infrared drying heating in recent years with the astonishing development speed is accepted, and the actual use at all levels, mainly is the infrared drying method has the following advantages: making 1 penetrating, inside and outside at the same time heating. Making 2 without heat transfer medium to transfer, good thermal efficiency. Making 3 local heating, energy saving. Making 4 provide comfortable working environment. Ma
5 save construction cost and space of the furnace body, combination, easy installation and repair. The heating process of making 6 clean. Making
7 easy temperature control, and rapid heating, and more safety. Making 8 thermal inertia small, do not need to warm up, save manpower.
Radiation heating and drying including infrared, ultraviolet, microwave / RF, electron beam and laser, which is based on the principle of infrared drying from electromagnetic radiation to heat, heat transfer in a direct way to heating and drying of the object, so as to avoid the heat conduction due to loss, good energy saving, while the infrared due to produce easily the characteristics, good controllability, and rapid heating, short drying time, productivity, product quality improvement and equipment space saving etc.. Microwave heating
Microwave is an electromagnetic wave of high frequency, the frequency range of approximately 300MHz to 300GHz. It has fluctuations, frequency, thermal and non thermal characteristics of four basic characteristics. Microwave is an electromagnetic wave also has wave particle like two. Microwave quantum energy of 1 99 × l0 -25 ~ 1.99 × 10-22j. it tissue interactions mainly for thermal effect and non thermal effect. Microwave can be transmitted to the tissue so that the polar side chains and protein dipole molecules with high frequency oscillations, caused by electromagnetic oscillation of molecules, increase the motion of the molecules, causing heat. Microwave can also have an effect on the hydrogen bond, hydrophobic bond and Fan Dehua, to re allocation, which changes the conformation and activity of protein. Non thermal biological effect of organism is one of the important characteristics of microwave, it has become one of the important aspects of medicine, cytology and so on, at the same time it can also for microwave or microwave operation so as to provide theoretical basis with awareness of microwave heating technology deeply, it has attracted a lot of attention, and the in-depth and extensive research in some aspects.
Thermal effect of microwave on organism refers to the physical image by microwave induced biological organization or system and heating on organisms
Ring. Heat effect is the organism polar molecules in microwave field under the effect of repeated rapid orientation rotation and friction; vibration in ion under microwave irradiation will vibration energy is converted into heat; general molecules can also absorb the microwave energy to heat energy is increased after exercise. Microwave is an electromagnetic wave. This electromagnetic energy is not only than radio waves are usually much larger, but also a strong “personality”, microwave an encounter took place reflective metal, the metal there is no way to absorb or transfer it; microwave can pass through glass, ceramics, plastics and other insulating material, but it will not consume energy; which contain water of food, microwave not only can not through, its energy but will be absorbed. Induction heating
Induction heating, using the principle of electromagnetic induction, the blank is arranged in an alternating magnetic field, the induced current method, so as to produce Joule heat blank. RF heating due to frequency