The raw materials for pre-coated films mainly fall into two categories: substrates and coating materials. The substrate forms the basis for film adhesion and commonly includes metal sheets such as steel and aluminum plates, as well as plastic films such as polyester (PET), polyvinyl chloride (PVC), and polycarbonate (PC). Metal substrates typically undergo surface treatment to improve coating adhesion; plastic substrates require good flexibility and dimensional stability to meet the requirements of roll forming, cutting, and processing.
Coating materials are key raw materials for realizing the functionality of pre-coated films and mainly include resins, pigments, solvents, and additives. Resins are the main material for the coating, such as polyester resins, polyurethane resins, acrylic resins, or fluorocarbon resins. Different resins impart different weather resistance, corrosion resistance, and flexibility to the film. Pigments provide color and hiding power, solvents help adjust the viscosity of the coating for easier application, and additives improve leveling, adhesion, antistatic properties, or abrasion resistance. By rationally proportioning these raw materials, pre-coated films with stable performance and meeting application requirements can be prepared.
