White sweet potato powder coating technology

First, the raw material selection processing Sweet potato starch, dried sweet potato starch, should choose advanced sweet potato processing machinery and equipment, after 100 mesh nylon mesh filter processing fine, color white, no impurities, no mildew of pure sweet potato starch. If you choose raw materials, it will directly affect the quality of the skin.

Second, choose a good roller to dry the skin is good or bad The main equipment is a powder roller. At present, there are various types and types of powdery laps on the market. You should choose easy heat transfer, smooth surface, durable and easy to operate when you purchase. At present, the most suitable is a 0.5 cm-thick brass plate or copper plate, it can also be made of aluminum plate, the diameter of the upper mouth is 45 cm, the diameter of the lower base is 38 cm, and the pot-type rotation is 8 cm high.

Third, the day before the starch filtration and air-drying powder, the granular white sweet potato starch should be placed in a cylinder, diluted with water, and filtered with a 120-mesh nylon mesh to filter out impurities therein. Then soak in the large tank for 10 to 12 hours to completely soften the starch particles and use it for the next day.

Fourth, the ingredients smashing to 50 kg of starch processing of pink skin as an example. 150 grams of alum was pulverized into a powder and placed in a pot. 500 grams of warm boiled water was added to dissolve the alum, and then 500 grams of starch and 5 kilograms of warm boiled water were added and stirred thoroughly to prepare a thin milk paste. Pour the formulated liquid into the diluted starch soaked in the previous day and stir it evenly. Alum should not be added too little or too much. Too little to dry out the lack of toughness and elasticity of the skin, eat it without bones; too much lead to crisp, easy to break, is not conducive to packaging and transportation.

Fifth, air dry powder processing system to choose continuous sunny weather, adequate light weather. First of all, the water in the pot is burned until it is opened. When the powdery batter is put in the water, it is floated on the surface of the water. After a minute of blanching, the batter is rinsed with a small spoon of about 50 to 100 grams of dry powder. Spoon stirred starch milk, into the spinner, and then hand forward or reverse rotation, so that the starch milk in the rotor flat uniform, leaving no cracks, leaking holes. When the starch milk heats from white to gray and translucent, take out the spinners and cool them in a cold water bowl. After the starch milk is completely cool, take it out and place it on a pelt curtain made of straw.

Sixth, drying the packaging will be flat on the curtain of the skin is placed in the ventilation and light to dry for 2 to 3 hours, when the dry skin 90%, from the curtain on a piece of land, every 10 or every 20 sheets in the Together, put it on the curtain again, place a heavy object on it to flatten the pink skin, and finally bundle or bag it for storage and sale.