How to improve the adhesion of PET film? -Film supplier
PET film is a kind of thermoplastic film with high transparency, good gloss and good airtightness. It is widely used in packaging, optics, building materials, medicine and other industries. PET film is a kind of film with relatively strong polarity, and the surface tension of PET film without any treatment can reach more than 40 dynes. However, some inks are directly coated, and the adhesion is not ideal. A special treatment is required on the PET film to achieve better adhesion. Adhesion is the foundation of most properties of coatings, such as scratch resistance, water resistance, abrasion resistance and chemical resistance. There is no clear scientific explanation for the fundamental mechanism of adhesion. It is generally believed that substrates with high surface tension can form good adhesion. However, this theory is on PET film. Among the commonly used plastic film substrates, PET film is the third most difficult substrate to attach after PE and PP. Corona treatment is a physical treatment method in which fine cracks and effective functional groups are formed on the surface of the film by high-voltage discharge. This treatment method is more effective on PET film and is the most commonly used treatment method. After corona treatment, not only the surface tension is greatly improved to facilitate wetting, but also the surface roughness is greatly improved. For scenes with general requirements for adhesion, corona treatment is already very good. However, if the customer has particularly high requirements for adhesion, the corona treatment cannot meet the high-quality requirements. UV hard coating liquid is a kind of hard coating that is cured by ultraviolet lamp. After coating a layer of UV hard coating liquid on the PET film and curing by ultraviolet lamp, it will form a layer of high hardness, transparency and resistance on the PET film. Scratched coating. The hardness of the PET film after UV curing treatment will be greatly improved, thereby extending its application scenarios. 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 range 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, warm and thoughtful service, and the spirit of assisting partners to achieve their own careers. Interested parties welcome to inquire!