Attention to problems in the printing process of liquid flexible packaging film

Choose the right material. In actual production, suitable printing films and printing inks should be selected according to the specific conditions such as filling speed, sterilization conditions, and product shelf life of the automatic filling machine, and the printing process parameters should be adjusted and controlled according to the actual situation to standardize the process flow. , to ensure the printing quality of the film. Polyamide watch ink because of its water resistance, oil resistance is not good, liquid ink can not generally be selected; polyurethane inks are also different types, the selection must be targeted, New Oriental Chao Li 313A ink is generally used only for soft Coextruded PE film, and 314 is suitable for a variety of coextruded PE film. The co-extruded PE film used by the color printing manufacturers is generally manufactured by the manufacturers themselves, and the technical level is not the same. Therefore, it is necessary to grasp the selection of the masterbatch. It is advisable to use the masterbatch that does not contain the slip agent; the PE film used passes through After EDM treatment, the surface energy must be at least 40 dyne, preferably more than 42 dyne.

The customer's post-processing conditions or test criteria. The color printing manufacturers can only achieve a targeted and well-informed knowledge if they fully understand the conditions of the food manufacturers during filling and the subsequent processing techniques, and even the detailed requirements for liquid packaging in the market. The main points of attention include: filling speed, sterilization conditions, length of shelf life, preservation requirements and other printing markets.

Printing process requirements. In order to ensure the printing quality of the liquid packaging film, it is also necessary to pay attention to the control of 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 the scale production. The smooth progress. In addition, the overall quality of printing workers, the technical information provided by ink manufacturers, the quality of thinner materials, and the changes in the workshop environment are also factors that cannot be ignored.

Control the printing environment. The change of temperature and humidity in the printing shop has a certain impact on the properties of the substrate materials and inks. Too dry environments can cause static electricity in the film and cause difficulties in printing. Too much humidity in the environment can result in insufficient drying of the ink and affect the firmness of the ink layer. Therefore, the ambient temperature and relative humidity in the printing shop should be strictly controlled, as far as possible to maintain a relatively constant, and to ensure good ventilation, in order to reduce the incidence of printing failures. In general, the temperature in the workshop is controlled between 18°C ​​and 25°C, and the relative humidity is preferably between 60% and 70%.

Do a good job of inspection of finished products. Customer satisfaction is the highest criterion and final desire of each printing company, so it is necessary to ensure that qualified products are delivered to customers. This will not only satisfy customers, but also safeguard the company's image and reputation. This is the basis for maintaining and developing good customer relationships.

In the production process of liquid packs, the changing of the film is relatively frequent, and the performance of the film is likely to vary. The liquid pack uses a small amount of ink, and the long-term use of the old ink printing may also bring about a decline in the performance of the ink. Therefore, the liquid pack may be produced. Many factors are changing. Color printing companies can work out a set of suitable testing standards for finished products by simulating the conditions of use of customers, so as to ensure that unqualified products do not leave the factory and avoid unnecessary losses.