The casting method can produce polyolefin casting films, polyolefin preservation films, polyamide casting films, etc. In general, cast film refers to polyolefin cast film, which can be further divided into cast polypropylene (CPP) film and cast polyethylene (CPE) film. CPP film has many characteristics, such as high transparency, good stiffness, low heat sealing temperature, heat resistance, moisture resistance, good barrier properties, strong printing and composite adaptability, smooth surface, and resistance to steaming and boiling. It can be used for packaging food, stationery, groceries, and textiles through printing and bagging, or can be composite with other films (PP is generally used as the inner and outer layer material of the composite film) for packaging various foods, including foods that require heating and sterilization, seasonings, soups, etc. Compared to PP blown film, CPP film has excellent optical properties and high production efficiency. In developed countries around the world, the production of polypropylene cast film CPP film is higher than that of PP blown film; Compared with biaxially oriented polypropylene (BOPP) film, CPP film has the advantages of simple processing equipment and low cost per unit area, and occupies a place in the high-end packaging film field.
