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The variable factors in color-printed packaging are numerous, and customers have relatively high requirements for printed packaging. To print products that meet customers' expectations, it is necessary to make preparations in these five aspects.
1. Select suitable raw materials
Polyamide pad printing ink has poor resistance to water and grease. Such ink cannot be used for liquid packaging. There are different types of polyurethane-based inks, and their selection should be targeted. The co-extruded PE film used by color printing manufacturers is usually made by the manufacturer itself through film blowing, and the technical level varies. Therefore, it is necessary to select the right type of masterbatch. It is advisable to use the masterbatch without slip agents. After the PE film selected is treated by electro-discharge, the surface resistance should be at least 40 dynes, and it is best to exceed 42 dynes.
II. Customer's post-processing requirements or test specifications
Color printing manufacturers must understand the requirements of food manufacturers during the filling process, as well as the subsequent processing techniques, and even the detailed requirements for liquid packaging during the market circulation process. Only in this way can they be targeted and have a clear understanding. The important points to pay attention to include: filling speed, sterilization requirements, shelf life length, storage requests, etc.
III. Requirements for Printing Process
In order to ensure the printing quality of the liquid packaging film, during the printing process, it is also necessary to pay attention to the control of process requirements such as printing tension, printing pressure, printing speed and drying temperature. A stable and reliable process specification and standard process flow should be formulated to ensure the smooth implementation of large-scale production. In addition, the comprehensive quality of the printing workers, the quality of the products provided by the ink manufacturer, and changes in the workshop environment are also factors that cannot be overlooked.
Four. Control the printing environment properly
The changes in temperature and humidity within the printing workshop have certain effects on the properties of the substrate and the ink. An overly dry environment can cause film static electricity, leading to printing difficulties; an overly humid environment will make the ink dry insufficiently, affecting the firmness of the ink layer. Therefore, it is necessary to strictly control the environmental temperature and absolute humidity in the printing workshop, maintaining them as constant as possible and ensuring good ventilation to reduce the occurrence rate of printing defects. Generally speaking, the temperature in the workshop should be controlled between 18℃ and 25℃, and the absolute humidity should be controlled between 60% and 70%.
V. Complete the task of product inspection
Customer satisfaction is the highest principle and expectation of every printing enterprise. Therefore, it is necessary to ensure that qualified products are delivered to customers. This not only satisfies the customers but also maintains the enterprise's image and reputation, which is the foundation for maintaining and developing good customer relationships. In the production process of liquid packaging, changing the film is frequent, so there are many variable factors in the production of liquid packaging. Color printing enterprises should be able to formulate a set of appropriate product inspection standards by imitating the customer's usage requirements, to ensure that unqualified products do not leave the factory and prevent unnecessary losses.
