The characteristics of PVDC coating film are obtained by coating one or more layers of polyvinylidene chloride (PVDC) latex on various film materials. Its excellent barrier performance is mainly manifested in the ability to reduce oxygen transmission hundreds or thousands of times, thereby greatly improving shelf life, freshness, aroma retention, oil resistance, and so on. Use specialized equipment to apply one or more layers of polyvinylidene chloride (PVDC) latex on various film materials, resulting in high barrier performance films. PVDC latex can be coated and processed on various film substrates such as BOPP, BOPET, BOPA, CPE, CPP, PVC, VMPET, etc., to produce different types of K coating films. And it has the same printability and composite properties as ordinary thin films, and can also have double-sided heat sealing performance as needed. The application of K coating is extremely extensive, with food and drug packaging as its main application areas. Generally speaking, using K coating film reduces the amount of materials used in packaging compared to ordinary PE film, paper, aluminum foil, etc., thus achieving the goal of reducing packaging and waste sources.