1. Printing standard light source is very important
At present, many self-adhesive label printing companies do not use printing standard lighting sources, which poses a hidden danger to the color consistency control of label products. Many self-adhesive label printing companies use the lighting source to see the color during the night shift is very different from the color seen in the sunlight during the day, which leads to the difference in printing color. Therefore, it is recommended that the majority of self-adhesive label printing enterprises must use the printing standard lighting source for lighting, and the qualified enterprises also need to be equipped with a standard light source box, so that employees can compare the color of label products under the standard light source. This can effectively avoid the problem of color difference of printed products caused by non-standard lighting sources.
2. Color consistency of spot color ink
In the production process of self-adhesive label printing, it is often necessary to prepare spot-color inks. Many self-adhesive label printing companies are far from the color of the samples when preparing spot-color inks. The main reason for this situation is that the ink ratio is not correct. Spot color inks are prepared from a variety of primary color inks, and most UV inks are Pantone (PANTONE) color systems, so when we formulate spot color inks, we often formulate according to the ratio given on the Pantone color card. However, it should be pointed out here that the ink ratio on the Pantone color chart is not necessarily completely accurate, and there are often small differences. At this time, there are certain requirements for the experience of the printing staff, because the sensitivity of the printing staff to the ink color is very important. Printing staff should learn more and practice more, and accumulate experience in this area in order to achieve the level of proficiency. What I want to remind everyone here is that not all inks are based on the Pantone color system. When encountering non-Pantone color inks, the ratio on the Pantone color card cannot be used, otherwise it will be difficult to formulate the required s color.
3. Ink problems will cause color difference
There is a situation: after the label product is placed at the customer's place for a period of time, its ink color gradually changes (mainly manifested as fading), but the same phenomenon does not occur in the previous batches of products. This is generally caused by the use of expired ink. The shelf life of ordinary UV ink is usually one year, and the use of expired ink is prone to fading of label products. Therefore, self-adhesive label printing companies must pay attention to the use of inks produced by regular manufacturers when using UV inks. At the same time, they should pay attention to the shelf life of the inks and update the inventory in time to avoid using expired inks. In addition, pay attention to the amount of ink additives used in the printing production process. If the ink additives are used in excess, the color of the ink after printing may also change. Therefore, when using various ink additives, it is better to communicate with the ink supplier first, and then determine the correct ratio range of the additives.
