The tea industry is a traditional industry in China. In order to improve the processing quality of tea and industrial modernization, it is necessary to apply new science and technology in the primary processing industry and deep processing industry of tea, and the advanced freeze-drying technology has a good application prospect in tea.
Freeze-drying technology When drying tea leaves, the temperature of tea is always kept below -16°C. Due to the low temperature of tea leaves, the chlorophyll hardly changes, the color is green and green, and it is resistant to hiding. The nutrients and various organic substances in the aroma and tea leaves are almost the same. Without loss, even drying, the water content can be as low as 3% or less; at the same time, the water has been frozen before drying, the product has a sponge-like porosity after drying, the product has good rehydration, and the content of tea is easy to dissolve. Freeze-dried tea can improve the quality of the tea industry by one to two grades on the basis of traditional techniques. The tea dried with this device can maximize the preservation of color, smell, taste, shape, water content can be reduced to 3% or less, so the product quality is greatly improved, and to maximize the product's shelf life. Good product quality;
Generally, when hot tea is used to dry tea leaves, the tea leaves are heated in the hot air, and some of the organic substances in the tea leaves continue to oxidize under the heated state, which consumes a part of the nutrients; the chlorophyll is also decomposed and destroyed at high temperatures and the color of the tea leaves is darkened; Some of the aroma substances also dissipate with the hot air, and the water content can only reach about 9 to 12% under normal circumstances. The product is not resistant to storage.
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