What is PVDC coating?

PVDC coating is also called PVDC coating, coating and coating, or K film for short. Generally, there are films such as KOP/ matting, KPET, K nylon and KPE. Polyvinylidene chloride (PVDC), commonly known as sarin, has a long history of application abroad. Since the industrial production of Dow Chemical in the United States was first realized in the 1930s, PVDC has become synonymous with high barrier, and the packaging industry even called it the "queen" of high barrier materials. Once the film materials such as BOPP, BOPET, BOPA and PE are coated with PVDC, excellent high barrier properties can be obtained. It has been used in China for more than ten years. Because foreign companies monopolize the supply of raw materials, the development of PVDC latex in China has been stagnant, which limits the development of PVDC coating industry. Nowadays, the successful development and stable production of domestic PVDC latex such as Quzhou Juhua and Dongyang Ye Feng have prompted foreign enterprises to liberalize the sales of PVDC latex, and the PVDC coating industry has developed greatly.

K-film is a film with high barrier performance, which is made by coating one or more layers of polyvinylidene chloride (PVDC) emulsion on various film materials with special equipment. Its excellent barrier performance is mainly manifested in that it can reduce the oxygen permeability by hundreds of times, thus greatly improving the shelf life, fragrance retention, freshness preservation and oil resistance. But also has the same printing performance and composite performance as ordinary films, and can also have double-sided heat sealing performance (heat sealing strength is 0.8N/ 15mm) as required. PVDC resin is often used as composite material or monomer material and extruded film sheet, and it is the most widely used high barrier packaging material, in which the amount of PVDC coating film is very large. PVDC coating is based on polypropylene (OPP), polyethylene terephthalate (PET) and so on. Due to the high softening temperature of pure PVDC, close to its decomposition temperature, poor compatibility with general plasticizers, it is difficult to thermoform and directly apply. The actual PVDC films are mostly polymers of vinylidene chloride (VDC) and vinyl chloride (VC), and films made of methyl acrylate (HA) with excellent barrier properties.