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Generally, the printing of plastic bags is done through two methods: one is copper plate (gravure) printing; The main method is to operate the copper plate soaked in ink under the drive of a motor. The ink adhered to the surface is scraped off by a scraper to remove the blank ink. Under tension control, the film is in contact with the copper plate under the pressure of the printing wheel, transferring the remaining oil and ink on the copper plate to form the printing content on the film. It is dried and cured by a fan, and then rolled up into a film roll by a rolling table. Another type is called offset (relief) printing, which mainly uses double-sided adhesive to stick the offset to the corresponding plate roller, and operates under the drive of the motor and transmission gear. The protruding part of the plate is uniformly coated with a layer of ink on its surface through compression and friction with the ink roller. When the film passes between the printing roller and the plate roller at a uniform speed, under the pressure of the printing roller, the ink from the protruding part of the plate is transferred to the film to form the required printing content, which is then dried and solidified by the fan and rolled up on the winding table.
