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The printing surface treatment technology was first developed to solve the problem of poor adhesion of plastic film surface printing and coating. The basic materials of plastic films are mainly polypropylene (PP), polyhexene (PE), polyvinyl chloride (PVC), polyester (PET), etc. Their surface characteristics vary greatly due to the polar groups of the molecular structure substrate, the degree of crystallization, and the chemical stability of plastics. These factors have a great impact on the adhesion fastness of the printing ink layer. For PS (polystyrene) and PVC with polar structure, surface pretreatment is not required before printing, but for PP, PE and PET with non-polar surface structure, their chemical stability is very high, they are not easy to be penetrated and dissolved by most ink solvents, and their bonding with ink printing is very low. Therefore, they must undergo surface treatment before printing to activate the plastic surface to generate new chemical bond to coarsen the surface, Thereby improving the adhesion fastness of ink to the surface of the film; In the process of manufacturing certain granular materials at the same time, a certain amount of additives, additives, and lower opening agents are added according to different requirements. After the film is absorbed and shaped, these additives float on the film surface, forming an invisible oil layer. These oil layers are completely detrimental to printing, making the film surface difficult to adhere and reducing adhesion. Therefore, film materials with these oil layers must undergo surface treatment to remove grease from the film surface and improve ink quality Adhesion fastness of the coating.

During the surface treatment process, when the plasma comes into contact with other substances, the input energy is transmitted to the surface of the material being contacted, and a series of effects are generated accordingly. When the plasma meets the surface of the treated object, it produces cleaning, activation, and etching effects, resulting in the surface being cleaned and the removal of hydrogen carbide pollutants such as grease and auxiliary additives. Based on the material composition, the surface molecular chain structure is changed. Free groups such as hydroxyl and carboxyl groups have been established, which have a promoting effect on the adhesion of various coating materials and have been optimized for adhesion and paint applications.


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