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The production process of PET polyester film will give you a detailed explanation: Surface treatment: In order to improve the hygroscopicity of our polyester film, the surface treatment process is carried out. There are two types of this treatment: 1. Etching is a treatment with trichloroacetic acid (TCA) to change the molecular structure of the film surface. This treatment method is to adapt the film to water-dispersed coating, otherwise it will not adhere to the untreated PET surface. 2. The chemical treatment method refers to the establishment of a 'bridge' between the polyester film and the subsequent coating layer. It is a company specializing in the production of PET film with multiple functions, such as: transparent PET film, milky white PET film, release PET film, supply of PET motor film, etc. 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!