Tea preservation has been a problem since the beginning of tea. The original method was to pack with airtight bags. After that, some teas represented by Tieguanyin were vacuum-packed, which made the tea preservation time increase due to vacuum. The packaging material is permeable, so it is more troublesome to select the packaging material, and the packaging cost is relatively high. For green tea, if vacuum packaging is used, it will destroy the "shape" in the four elements of "tea", "fragrance", "flavor" and "shape" of tea. Although the color and fragrance are temporarily available, the most important shape of green tea will be affected. To the destruction, therefore, green tea packaging generally does not use vacuum packaging. Classification of automatic tea packaging machines 1. Classified according to the packaging of the inner bag (1) Single-capped tea automatic packaging machine The tea bag is made of heat-sealed filter paper, and the device is sealed by heating to the inner bag of the rubber bag and is sealed with the label cotton. (2) Double-capsule tea automatic packaging machine Most of the tea bags use cold-sealed filter paper. The equipment folds the bottom of the filter paper of the tea bag into a w-shape, and seals the inner bag filter paper with the label cotton wire with metal nails. These machines are now completely dependent on imports. The main manufacturers are Italy's ima company and Germany's teepack company. Typical models are c20, c21, c23, c2000, and constanta machines produced by teepack. . 2. Classified by major technical indicators (1) High speed machine Productivity is 20o ~ 2000 bags / min. Such as the Italian ima company c23, c55, c56, c2000 and other models. Due to the production efficiency of this type of machine and the stability, high reliability and high degree of automation of Anxi tea, the product quality and technical level are high. But the structure is complicated and expensive. (2) Medium speed machine The productivity is from 10o to 18o bags per minute. Such as the Italian ima company's c21 machine, the German teepack company produced constanta machine, Argentina mais. a company produced ec12 series products. (3) low speed class machine Productivity is typically 30-60 bags per minute. This type of machine is simple in structure and convenient in maintenance. It is a model derived from the general vertical bag forming and filling a mouth machine. The inner and outer bags are heat-sealed together, and the labels and cotton threads are exposed outside, so they do not meet the increasingly strict hygiene requirements. Even if there is a cartoning mechanism, the productivity is low and the degree of automation is not high. For example, Japan's hk-601-t, hk-301-t machine, Taiwan's js-a6a, js-8, js-10 machine and China's dch160 and dch160g. In summary, the automatic tea packaging machine that does not touch the human hand and the packaging unit that can automatically fill the nitrogen will replace the manual weighing and old-fashion packaging equipment!