Microwave application in tea fixation

Tea processing is important industry in many countries. In order to improve tea processing quality and industry modernization, it is necessary to apply new science and technology in the tea primary processing and deep processing, and advanced microwave technology has a good application prospect in tea. Microwave refers to ultra-high electromagnetic waves between radio and light waves at 30MHz-300000MHz. At present, the center wavelength of microwave devices used in the food industry is 0.328m (frequency 915MHz) or 0.1225m (frequency 2450MHz).

Microwave equipment for tea: fixation, drying, sterilization andinsecticide. One machine with multiple functions, it is an indispensable equipment for tea processing.

Tea fixation is one of the primary production processes of green tea, yellow tea, dark tea, oolong tea etc. Using the characteristics of microwave rapid heating, high temperature destroys and passivates the oxidase activity in fresh leaves, inhibits the enzymatic oxidation of tea polyphenols in fresh leaves, evaporates part of the moisture in fresh leaves, makes tea soft and easy to roll and shape. The finished tea leaves processed by microwave are green in color, intact in shape and fresh in tea aroma. It is a new type of high-efficiency fixation technology.

Microwave tea fixation features:

1) Fast heating speed. The microwave directly acts on the tea leaves, heating the inside and outside of the tea leaves at the same time, without any conduction process, without preheating, turn on the machine and can process directly.

2) Heat evenly. Microwave fixation?is that the electromagnetic wave generated by the magnetron is evenly irradiated on the tea leaves, , without the phenomenon of coke leaves and coke edges.

3) Less nutritional loss. Tea stays inside?the microwave heating box for a short time, does not require air and steam to conduct heat, so can retain the nutrients.

4) High efficiency and save energy .?Microwave among all processes of drying uses least amount of power, as the air, vessel and atmosphere does not get heated and energy wasted in air. 100% power energy goes towards heating /drying.Today grid electricity is the cheapest source of energy more than coal or gas, and does not require a Stoker to attend the heat source.

5) Improve tea quality. The surface temperature of the tea leaves is not high when microwave?fixation, and there is no need to blow and cool when the leaves emerge, so the chlorophyll changes less, the color is emerald green, and the aroma loss is less. At the same time, due to the fast evaporation of water, it is easy to form porosity. The soluble matter is easily dissolved during the time.

6) Improve the hygienic quality of tea. There is no need to burn coal and wood , there is no pollution from smoke and dust. At the same time, realize ?the automation and continuity of tea processing, avoid the secondary pollution caused by conventional processing?well.