Raisins have a long history in China and are well-known domestic and foreign famous products. Its advantages are that the weight is greatly reduced, the volume is significantly reduced, it is easy to transport, it can be stored for a long time, it is convenient to eat, and it is rich in nutrients. It is very popular with prospecting, navigation and tourists. Process selection of raw materials → → fruit → dry → packaging operation points a. raw material selection Dried grape fresh fruit, should choose high solid content, flavor and color, enzyme browning is not serious, maturity is appropriate, thin skin, Meatless, non-nucleated varieties with sugar content above 20%. b. Washing and decontamination Washing is usually done with 1.5-4.0% sodium hydroxide solution to wash away the waxy and harmful microorganisms attached to the peel, and at the same time, it can be disinfected and make small cracks in the peel to facilitate evaporation of moisture and promote drying. . c. Drying is performed by natural drying and artificial drying. Naturally processed raw materials will be washed and put in the sun tray for 3-5 days, then flipped over and continue to be dried in the sun for 2-3 days. Then the drying pan will be placed in a draught room and dried for about 30 days. Bright green, good quality. Then store it back to soft for more than 3 weeks, threshing and removing the stem and packing it. The advantage of natural drying is that the equipment is simple and the cost is reduced. However, due to the limitations of the climate, the drying time is too long and it is easy to reduce the product quality. Artificial drying must have good heating and heat insulation, ventilation and water dispersal equipment, and also have good hygienic conditions, which can greatly shorten the drying time and ensure the quality of production. However, the cost is high and the operating technology is more complicated. At present, many vine-based dry units at home and abroad have gradually developed in the direction of artificial dryness.
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