1, freezing method: put the unused casings in the refrigerator for freezing preservation. First, put the casing in a fresh-keeping bag to reduce contact with air and avoid oxidation, and then put it in the freezing area of the refrigerator to keep the temperature below 0 degrees, so that the casing can be stored for a long time.

2, liquor preservation method: high-alcohol liquor can not only sterilize, but also make casings antiseptic and deodorizing. Soak the unused casings in white wine and take them out when necessary.

3. Pickling method: Pickling unused casings can be sterilized and preserved. Wash the casing, marinate it with salt, and then hang it in a ventilated place.