Tunnel Microwave Machine for TEA Fixation/Wither/Soften
Enzymes are mostly composed of proteins (a few are RNA) and their activity is easily influenced by temperature, chemical environment and other factors, and when enzymes are exposed to high temperatures, their protein molecular structure is irreversibly damaged, thus completely dissipating their enzymatic activity. The greening process means that high temperature measures are taken to rapidly transform the inclusions of the fresh leaves.
The "fixation" of tea leaves takes advantage of this high temperature inactivation of enzymes to stop the activity of oxidase (especially polyphenol oxidase and peroxidase) in fresh leaves in time.
In the fixation/wither/soften, fresh leaves contain high water, and water absorption capacity of microwave is strong, can be polarized in the microwave electric field, and with the frequency of electromagnetic field constantly change polar orientation and do high-speed movement, resulting in frictional heat, so that the overall heating of tea in the microwave, and eventually make a large number of water molecules from the fresh leaves overflow and evaporated away, and microwave heating so that the tea leaves within the rapid warming, to reach the critical point of passivation enzyme Temperature, thus quickly blunt the enzyme activity in the tea, while the combined effect of the electromagnetic field and temperature field generated during microwave heating will strengthen the deformation of the enzyme in the tea, thus achieving thefixation purpose.
The purpose of tea fixation:
1. To destroy the polyphenol oxidase activity in fresh leaves within a short period of time by using high temperature to inhibit the enzymatic oxidation of polyphenols, so that the inclusions can form the colour, aroma and taste of green tea, black tea, black tea, yellow tea and pu'er tea under non-enzymatic action.
2. Removing the part of moisture, so that leaves change from hard to soft, facilitating kneading and shaping.
3. Remove the green grass smell of the fresh leaves and give off a charming tea aroma.
Microwave fixation is one new type technology, which is faster, more efficient and more effective than traditional equipment such as pot fixation and drum fixation. At the same time, microwave technology has changed the way tea workers work and reduced labour intensity, which is of great significance to the progress of tea processing technology.
The microwave tea fixation machine is now widely used for tea, chrysanthemum, honeysuckle, lotus leaves, barley seedlings, various flowers and other agricultural products, and the fixation effect is remarkable.