Application of Microwave Drying and Drying Technology in Tea Making
In recent years, Japan and South Korea have applied microwave technology to the processing of tea and achieved good economic benefits. Tea processing has a very broad prospect for development. China is a big tea producing country, and the application of modern processing technology of tea has broad market prospects. Microwave technology for tea greening, drying and extraction of active ingredients has been reported in recent years. As one of the modern tea deep processing technologies, microwave application technology has begun to develop into large-scale production.
Since the discovery of the microwave thermal effect in 1945, the application of microwave heating has become increasingly widespread. Because the tea contains water, the water molecules are polarized in the microwave electromagnetic field, have dipole characteristics, and constantly change the polarity direction with the frequency of the electromagnetic field, the molecules vibrate at high speed, generate frictional heat, and heat the tea leaves from the inside. And the temperature is the same everywhere. By using this characteristic of microwave heating, the tea can be heated rapidly, the critical point temperature of the inactivated enzyme is reached, and the water migration of the tea structure is accelerated, which is very suitable for the green tea killing process and the post-tea drying operation. Japan and South Korea use microwaves for tea processing, and the effective nutrients of green tea can be basically not lost, and the color, fragrance and taste are better than traditional processing methods. It can be seen that microwave technology is an ideal way for tea greening and post-drying. The key to application is how to match microwave frequency, power, material running speed, structure of microwave heating equipment and research on microwave technology for tea. Technical specifications for killing, drying and extraction processes.
Microwave killing and drying are performed by microwave generator to radiate microwaves onto the greened and dried materials, and penetrate into the interior to induce polar molecules such as water to rotate synchronously, rotating several billion times per second. As a result of such high-speed rotation, the material instantaneously generates frictional heat, which causes the surface of the material to simultaneously heat up, and the internal temperature is higher than the surface temperature of the material, so that the enzyme loses vitality, and at the same time, some water molecules evaporate to achieve the purpose of killing and drying.
The method of killing and drying is characterized by short heating time, uniform internal and external temperature, and the heat transfer direction is also consistent from the inside to the outside and the wet transfer direction. Different from the conventional heating method, it takes a certain time to heat the heat from the outside to the inside of the material. The difference between the internal and external temperature difference and the opposite direction of wet and heat transfer. The microwave energy penetrates into the internal heating of the material and does not require the characteristics of high-temperature heat medium. When applied to tea processing, it fundamentally changes the conventional heating method which relies on high-temperature medium and heat conduction heating, and at the same time, the microwave electromagnetic field is in the process of killing and drying. It has a non-thermal effect, which greatly shortens the processing time and shows the unique advantages of microwave.
Compared with the traditional coal-burning method, the comprehensive cost of microwave drying and drying can be reduced by 8.5 percentage points, and the processed tea leaves have good color, tea soup and fragrance, and the bitterness is reduced. The market price is 20-30% higher. . The traditional heating method of replacing coal, firewood and fuel oil with electric energy is no noise, no smoke, no dust, energy saving and environmental protection, and the microwave has strong sterilization and anti-mildew effect, and the tea products are hygienic and safe. At the same time, microwave technology has changed the working methods of tea-making workers, reduced the labor intensity, and has practical significance for the advancement of tea processing technology.
After years of hard work and practice, the microwave processing tea technology has been continuously improved, and now it can fully meet the market demand. Dongguan Qixie Microwave Equipment Co., Ltd. has developed a variety of specifications and uses of tea microwave application equipment with leading professional technology. The more tea processing companies are recognized.
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