Food is easily contaminated and deteriorated during production, storage, transportation and sales. Conventional technologies such as high temperature, drying, blanching, pasteurization, freezing, and preservatives can be used to achieve insecticidal and fresh-keeping of food. But it often affects the original flavor and nutritional content of food. The microwave sterilization machine is to make the microorganisms in the food be affected by the microwave thermal effect and the non-thermal effect at the same time, so that the protein and physiologically active substances in the body are mutated, which leads to the growth delay and death of the microorganisms, and achieves food sterilization and preservation. Purpose.
Advantages of microwave sterilization machine:
1.Short time and fast speed Conventional thermal sterilization transfers heat from the food surface to the inside through heat conduction, convection or radiation. It often takes a long time to reach the sterilization temperature. Microwave sterilization is the direct action of microwave energy on bacteria and other microorganisms. The principle of thermal effect and non-thermal effect is used to achieve the purpose of rapid temperature rise and sterilization. The processing time is greatly shortened. The sterilization effect of various materials is generally 3-5 minutes.
2.Energy saving Conventional thermal sterilization often has heat loss in the environment and machine, while microwave sterilization directly affects food, so the additional heat loss is very low. In addition, its conversion efficiency from electric energy to microwave energy is 70-80%, which can generally save electricity by 30-50%.
3.Both the surface and the interior are carried out at the same time. Conventional thermal sterilization starts from the surface of the material, and then spreads to the interior through heat conduction. There is a temperature difference between inside and outside. In order to maintain the flavor of the food and shorten the processing time, the internal temperature of the food often does not reach enough temperature to affect the sterilization effect. Because the microwave has a penetrating effect, when the food is processed as a whole, both the surface and the inside are affected at the same time, so the sterilization is uniform.
4.Low-temperature sterilization can keep the original taste and nutrients of food from being lost. Microwave sterilization uses special thermal and non-thermal effects to sterilize, and the sterilization temperature is much lower than conventional thermal sterilization. Practice has shown that the general sterilization temperature can achieve the effect at 75-80°C. In addition, microwave-treated food can retain more nutrients and flavors such as color, aroma, taste, and shape, and has a puffing effect.
5.Easy to control, no thermal inertia. The machine can be turned on and used immediately, and the operation is flexible and convenient. The microwave power is continuously adjustable from zero to rated power, and the transmission speed is continuously adjustable from zero, which is easy to control.
6.Improve working conditions, save floor space and be widely used. The working environment of the machine has low temperature and low noise, which greatly improves the working conditions. The operator of the whole set of microwave machine only needs 2-3 people.
7. The machine is simple and the technology is advanced. Compared with conventional disinfection and sterilization, microwave sterilization machine does not require boilers, complex piping systems, coal yards and transportation vehicles, etc., as long as the basic conditions of water and electricity are available.
The technical application range of microwave sterilization machine is extremely wide, and the application of microwave sterilization machine technology in food processing is only a small part of it.