1. Raw material ratio using fresh sweet potatoes requires white meat, a large, good quality, ratio of 320 ~ 360 kg of sweet potatoes. Broad beans or green beans 10 to 20 kg. If sweet potato is used, the sweet potato is required to be dry and white in color. After being peeled, it is soaked with clear water. Mung beans or beans require no impurities and good color. The ratio is 80% to 90% for sweet potato, and 10% to 20% for broad bean or mung bean.

2. Preparation of starch The sweet potato and broad beans are grounded with green beans. After being diluted with clean water and filtered, after 3 times of filtration, the combined filtrates were allowed to stand still in the water tank. The sedimentation time was 3 hours in summer, 8 hours in spring and autumn, and 24 hours in winter. After soaking, the soaking water was poured out. And remove the bottom of the slurry containing impurities, and then add clean water, stir the starch slurry evenly, let it precipitate, so repeated 2 or 3 times, and finally the white starch picked up and dried for use.

3. Dust ash powder from the dry starch to take 3% to 4%. Add water into a thin slurry with a water content of 95%, reconstitute into paste paste with boiling water, and mix it with the remaining 96% to 97% of dried spare starch. Add 1% alum and appropriate amount of clean water. Knead starch dough by hand. The starch dough preferably has a moisture content of 46%.

4. The powdered silk will stir and stir the cooked starch dough one by one into the scoop, so that the powder will fall into the boiling water pan evenly and slowly. After about 1 minute, the fans are cooked transparent and float on the water surface. Quickly stir with bamboo sticks or sticks, put in cold water, rinse and rinse, then dry to dryness.

5. The sales volume of fans for packaging and packaging shall not exceed 6%, and the packing grades of fans shall be determined according to the requirements of the acquiring unit.

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