Using sweet potato starch as the main raw material, the process involves drying and processing the powdered skin to achieve a white, transparent texture with excellent elasticity, resistance to melting, and a smooth, non-breakable surface. The air-drying technique is simple and doesn't require specialized machinery, making it ideal for small-scale family workshops. Here’s a detailed breakdown of the production method:
First, raw material selection and preparation are crucial. High-quality sweet potato starch should be selected, preferably processed through advanced machinery and filtered through a 100-mesh nylon sieve to ensure purity—white in color, free from impurities, and without any mold. The quality of the raw materials directly impacts the final product, so careful selection is essential.
Second, the choice of a suitable roller is key to the drying process. The main equipment used is a powder roller. There are various types available on the market, but it's best to choose one that allows for efficient heat transfer, has a smooth surface, is durable, and easy to operate. A brass or copper plate with a thickness of 0.5 cm is recommended, with a top diameter of 45 cm, a base diameter of 38 cm, and a pot height of 8 cm. These dimensions help ensure even distribution and proper drying.
Third, before the actual processing, the starch needs to be prepared. The granular sweet potato starch is placed in a container, diluted with water, and filtered through a 120-mesh nylon mesh to remove any impurities. It is then soaked in a large tank for 10 to 12 hours to fully soften the starch particles, ready for use the next day.
Fourth, the mixing process begins. For example, when preparing 50 kg of sweet potato starch, 150 grams of alum is ground into a fine powder and placed in a pot. Then, 500 grams of warm boiled water is added to dissolve the alum. After that, 500 grams of starch and 5 kilograms of warm water are added, and the mixture is stirred thoroughly to create a thin paste. This liquid is then poured into the previously soaked starch and mixed evenly. It's important to control the amount of alum carefully—too little will result in weak, brittle skin, while too much can make it too crisp and prone to breaking, which is not good for packaging and transportation.
Fifth, the air-drying process requires sunny weather with sufficient light. The water in the pot is brought to a boil, and the starch batter is gently placed on the surface. After a minute of blanching, a small spoon containing about 50 to 100 grams of dry starch is used to stir the batter. The starch milk is then poured into the spinner and rotated either forward or backward to spread it evenly, ensuring no cracks or holes form. When the starch milk turns from white to gray and becomes translucent, the spinner is removed and cooled in a bowl of cold water. Once fully cooled, the sheet is taken out and placed on a straw-made curtain.
Lastly, the drying and packaging step. The flat sheets are laid on the curtain and left in a well-ventilated, sunny area for 2 to 3 hours until they are about 90% dry. They are then removed from the curtain, stacked in groups of 10 or 20, and placed back on the curtain with a heavy object on top to flatten them further. Finally, the pink skin is bundled or bagged for storage and sale. This method ensures high-quality, durable, and visually appealing products that meet consumer expectations.
Dried Alaska Pollack,Dried Alaska Pollock Silk,Pollack Dried,Grilled Dried Pollack
Yanji Yongzhen Food Co., Ltd , https://www.yanjiyongzhenfood.com