包装袋印刷常见问题及解决对策（Common problems and solutions of packaging bag printing）.doc

包装袋印刷常见问题及解决对策（Common problems and solutions of packaging bag printing） Common problems and solutions for packaging bags. TXT Common problems and solutions of packaging bag printing 1. Poor adhesion of ink on substrate 1.1 ink adhesion mechanism Wetting: the adhesion fastness is the result of the interaction between the substrate film and the ink. Compatibility: the ink connection material is similar to the base material and the compatibility is good. (make sure you choose the ink that matches the print.) 1.2 reasons and countermeasures of the adhesion Base material factors. A. The corona treatment of the substrate surface is not enough. The surface tension of the substrate is not met due to the poor storage environment and the storage time is too long, resulting in the attenuation of surface tension. The surface tension of PP and PE is generally required, and the PET is 50mN/m and NY 5.2mn/m. Check the surface tension of each batch before using. B. base material are added in the processing of certain lubricant, antistatic agent, moistureproof agent and so on, these additives over time, slowly permeate to the surface from the film, the film surface forming a layer of weak interface layer, affect the printing ink adhesion. Therefore, the film should be used during the period of validity, and the surface tension of the surface should be detected before use. Can be used for pen test. Base material factors The factors that absorb moisture of base material. For example, materials such as PA, PVA, PT and so on are easy to absorb moisture and reduce adhesion. Such base materials should be stored in good condition (temperature controlled humidity) and preheated well before use. Ink used in the wrong type, mixed with different types of ink. Gravure printing ink is a lot of more phyletic, have a table in the printing, printing ink, corresponding to different materials with different ink, all kinds of special ink must correspond to use, otherwise the adhesion fastness is not e