Soaking method: Soak the raw materials in liquid nitrogen, liquid Freon, ultra-low temperature saline solution, and other substances for rapid freezing and cleaning. This method has a faster freezing and cleaning rate.
Air cooling method: Blow ultra-low temperature cold air onto raw materials to freeze and clean them to a certain temperature within the required time.
Direct cooling method: Place the refrigerant or refrigerant in the volatilization discharge pipe, digest and absorb the heat generated by the raw materials to achieve the purpose of cooling.
Vacuum pump refrigeration method: using vacuum packaging to evaporate moisture in raw materials and remove heat, achieving the purpose of refrigeration for the raw materials.
Regardless of the method used, it should be ensured that the raw materials are frozen and cleaned to a certain temperature within the required time without deformation of the foundation.
