Choose the right material. In actual production, the appropriate printing film and printing ink should be selected according to the specific conditions of the filling speed, sterilization conditions, product shelf life, etc. of the automatic filling machine. To ensure the printing quality of the film. Polyamide surface printing inks are generally not suitable for liquid-packed inks due to their water resistance and grease resistance. Polyurethane inks also have different types, and they must be targeted. New Oriental Chaolifu 313A inks are generally only used for soft Quality co-extruded PE film, and type 314 is suitable for all kinds of co-extruded PE film. The co-extruded PE film used by color printing manufacturers is generally produced by the manufacturer. The technical level is different, so it is necessary to grasp the selection of masterbatch. It is appropriate to use the masterbatch without the slip agent model; the selected PE film is passed After EDM treatment, the surface energy should reach a minimum of 40 dynes, preferably over 42 dynes. Customer post-processing conditions or test standards. Only when the color printing manufacturers fully understand the conditions of the food manufacturers during filling and the subsequent processing technology, and even the detailed requirements of the liquid package in the market, can they be targeted. The main points of attention include: filling speed, sterilization conditions, length of shelf life, storage requirements and other printing markets. Printing process requirements. In order to ensure the printing quality of liquid packaging films, we must also pay attention to the control of process conditions such as printing tension, printing pressure, printing speed and drying temperature during the printing process, formulate a set of stable and reliable process standards, standardize the process flow, and ensure large-scale production Smoothly. In addition, the comprehensive quality of the printing workers, the technical information provided by the ink manufacturers, the quality of the thin materials, the changes in the workshop environment, etc. are also factors that cannot be ignored. Control the printing environment. Changes in temperature and humidity in the printing workshop have a certain impact on the substrate material and the performance of the ink. Too dry environment will cause film static electricity, causing printing difficulties; too wet environment will make the ink dry insufficiently, affecting the firmness of the ink layer. Therefore, the ambient temperature and relative humidity in the printing workshop should be strictly controlled, try to keep it relatively constant, and ensure good ventilation to reduce the incidence of printing failures. Generally speaking, the temperature in the workshop should be controlled between 18 ℃ and 25 ℃, and the relative humidity should be kept between 60% and 70%. Do a good job in finished product inspection. Customer satisfaction is the supreme criterion and ultimate wish of every printing company, so it is necessary to ensure that qualified finished products are sent to customers. This not only allows customers to achieve satisfaction, but also maintains the company's image and reputation, which is also the basis for maintaining and developing good customer relations. In the production process of liquid packs, the film is changed more frequently, which is easy to cause the performance of the membrane to be different. The amount of ink used in the liquid pack is not much. Printing with old ink for a long time may also reduce the performance of ink. There are many variables. Color printing enterprises can formulate a set of appropriate finished product testing standards by simulating the customer's use conditions to ensure that unqualified products are not shipped from the factory and avoid unnecessary losses.
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