Casing: In the process of sausage processing, the casing mainly plays the role of processing mold, container, and product performance display. The casing is in direct contact with the meat, and it must meet the following requirements. It must be safe and non-toxic, the chemical components in the casing do not migrate to the meat and do not react with the components in the meat. It must have sufficient strength to safely wrap the meat, withstand filling pressure, and withstand the stress of sealing and kinking. It also needs to have certain shrinkage and extension characteristics, which can allow the