The sweet potato starch is used as the raw material to make the powdered skin, and the cold salad is white in color, good in transparency, strong in toughness, resistant to melting, not easy to be broken, and smooth in taste. The air-cutting processing technology is simple, does not require special mechanical equipment, and is more suitable for a small-scale production of one-house workshop. The specific method of airing is as follows:
First, raw material selection and processing
The sweet potato starch that is sweetened by sweet potato should be selected from the advanced sweet potato processing machinery and processed by 100 mesh nylon screen to produce fine white starch with fine white color, no impurities and no mildew. If the raw materials are not chosen well, it will directly affect the quality of the skin.
Second, choose a good spine to air
The main equipment for the quality of the skin is the powdery skin. At present, the types of powdery spinners on the market are various and various types. When purchasing, it should be easy to transfer heat, the surface of the surface is smooth, durable and easy to operate. At present, the most suitable one is a 0.5 cm thick brass plate or a copper plate, or an aluminum plate, with a diameter of 45 cm, a bottom diameter of 38 cm, and a height of 8 cm.
Third, starch filtration
The day before the drying of the powdered skin, the granular white sweet potato starch was placed in a cylinder, diluted with water, and filtered through a 120-mesh nylon mesh to filter out impurities. Then, it is soaked in a large tank for 10 to 12 hours to completely soften the particles in the starch and be processed for use the next day.
Fourth, ingredients snoring
Take 50 kg of starch processed powder as an example. 150 g of alum was ground into a powder, placed in a pot, and 500 g of warm water was added to dissolve the alum, then 500 g of starch and 5 kg of warm water were added and thoroughly stirred to prepare a thin milk paste. Pour the preparation into the starch that has been diluted in the previous day and mix well. Alum should not be added too little or too much. Too little to dry out of the skin lacks toughness and elasticity, and does not eat bones; too much leads to the skin is crisp and easy to break, which is not conducive to packaging storage and transportation.
Five, air conditioning processing
To dry the powder, you should choose a weather with good weather and good sunshine. First, when the water in the pot is burned until it is open, put the powdery spinner into the water surface, and after hot pressing for 1 minute, use a small spoon that can make about 50-100 grams of dry powder. Stir the starch milk into the spoon, pour it into the spinner, and then rotate the hand forward or reverse the twister to make the starch milk evenly spread in the spinner without leaving cracks and leaks. When the starch milk is heated from white to grayish white and translucent, the spinner is taken out and placed in a cold water basin for cooling. After the starch milk is completely cooled, it is taken out and placed on a powder curtain made of straw.
Six, drying and packaging
Place the powder on the curtain in the air and ventilate for 2 to 3 hours. When the powder is 90% dry, take it off one by one from the curtain, and put it together every 10 or 20 sheets. On the curtain, put a heavy object on top to flatten the skin, and finally bundle or store the powder for sale.
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