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During the production and processing of polyester film, one of the important parameters for film formation is that the crystallinity of the cast sheet after extrusion from the die cannot be greater than 3%. To make the polyester film have good thermal stability, the cast sheet is stretched longitudinally. After stretching and transverse stretching, the crystallinity of the polyester film must be about 50%. Therefore, there are certain requirements for the crystallization process of the polyester during the processing. In order to improve the film-forming properties of the polyester film, a rapid cooling roll is required. The method of casting slabs suppresses the growth of crystals and controls the crystallinity of the castings to be no more than 3%; in order to improve the thermal stability of the polyester and increase its elastic modulus, the heat setting temperature of the transverse stretching should be set to that of the polyester. The fastest crystallization temperature enables the crystallinity of the polyester film to be controlled at about 50%. Because of the high softening point, low melting strength and crystallinity of polyester PET, it is more difficult to produce by blown film technology. The market more uses T-die casting and stretching after production. Common processing types include two-way Stretched PET, longitudinally stretched PET and twin-screw extruded sheet materials, and other processes, is a company specializing in the production of PET films with multiple functions, such as: transparent PET film, milky white PET film, release PET film, and supply PET motor film. With a wide variety of products, affordable prices, and environmental protection, we provide customers with excellent quality and service based on the service tenet of excellence in production, honesty and trustworthiness in distribution, and warm and thoughtful service. Interested parties welcome to inquire!