Withering, evenly spread under certain temperature and humidity conditions, so as to moderately promote the activity of fresh leaf enzymes, the substances contained in the moderate physical and chemical changes, and emit part of the water, so that the stems and leaves wilted, the color is dark green, and the green grass gas is dispersed. Withering is one of the indispensable steps in the tea-making process. The moisture content of freshly picked leaves is as high as 75% to 80%, and the main purpose of withering is to reduce the water content of fresh leaves and stems, and to promote the enzymes to produce complex chemical changes. White tea withers to the heaviest degree, the water content of fresh leaves is required to be reduced to less than 40%, black tea withers to the second heaviest degree, the water content is reduced to about 60%, and green tea withers to the lightest degree, the water content is required to be between 68-70%.
Common withering methods are natural withering, sunlight withering, and indoor heating withering. Natural withering is to evenly spread the fresh leaves on the bamboo curtain or bamboo sieve, placed in the air circulation, cool and dry place; daylight withering is the use of mild light so that most of the water in the tea leaves slowly evaporate. Indoor withering is used to wither the room blowing hot air for withering of fresh leaves, room temperature temperature mastered at 22 ~ 27 ℃, relative humidity mastered at 67% ~ 75% RH. The traditional way, it is difficult to control the environment of temperature and humidity, the time required is relatively long, but also in the process of withering, there is a health problem, affected by natural factors, and ultimately affects the quality of the tea leaves. PARKOOTEK intelligent dryer, using professional dehumidification technology, with intelligent humidity constant control system, according to the needs of production, automatic control of temperature and humidity of the withering environment to ensure the quality of the product. PARKOO dryer, with reference to the Nicanor principle, has two functions of closed dehumidification and heating at the same time. The internal cycle closed drying, without strong exhaust air, using high temperature to volatilize the water inside the tea leaves, through the internal cycle dehumidification system continuously discharges the water, directly and quickly reduce the humidity of the environment. By controlling the temperature and humidity of the withering room, the speed of water loss of withered leaves at different stages is controlled, so as to promote the rapid production and accumulation of the material base that determines the quality style of white tea, black tea, green tea and other tea types, in order to shorten the time of the withering process, stabilize and improve the quality.
