There are many reasons for the color change of the ink. Sometimes the ink formula is different, which will cause the color to be different. Sometimes, the improper cleaning ink operation will flow the ink of the previous color into the next color and will cause the color to be uneven. But the printing press often encounters the same bucket of ink, and the color changes often appear in different shades. What's the matter? Inconsistent printing colors will seriously affect the aesthetics of the product, causing customers to complain and return goods to the carton factory. Generally speaking, there are two situations for the color change when printing the same barrel of ink: First, the color is changed after the ink is produced on the machine; Second, the barrel of ink is used multiple times to change. This article focuses on the first situation! 1. The ink has been produced since it was put on the machine, which may cause color changes. Large order printing often occurs in production, such as the production of Wahaha, unified instant noodles, Mengniu, Yili and Other products, often the same ink but different colors are printed. These orders are very large, and each printing takes a long time to work. From the ink on the machine in the morning, it may not be printed until the afternoon. The color of this period is easy to fluctuate. The color was normal at the beginning of printing, and the color began to darken after 1.5 hours of printing. At this time, the operator likes to add water to the ink to make the color lighter. After printing for another 1.5 hours, the color density of the color decreased slightly. In this way, the colors of this batch are very different. Such as a red color mark (Figure 1) figure 1 The ink color becomes darker after 1.5 hours of printing (Figure 2) figure 2 After the printing staff adds water, the color changes (Figure 3) image 3 When three colors are put together, there is a color difference: Second, the improvement method: collect the production color data of the printing press, sample, and adjust the ink regularly There are many ways to control the ink, but in the production process, it is often to see the color change before starting to adjust the ink color, rather than preventing the color change of the ink in advance. To make the same batch of orders and color production consistent, we must consider the factors of printing machinery. At this time, it is necessary to collect the production color data of the printing press, sample, and formulate the appropriate interval to adjust the ink! The specific steps are as follows: 1. Determine the appropriate speed: verify the ink speed and color at the same viscosity, open the speed at 80 sheets / minute, 120 sheets / minute, and 160 sheets / minute, and then sample to arrange the three colors to see if there is any difference in color . For example: 120 sheets / minute, the color is stable, then you can set the speed to about 120 sheets / minute. 2. Test the ink and determine the appropriate adjustment time: The speed of the ink in the same barrel is controlled at 120-130 sheets / minute, monitor the viscosity of the ink, take color samples every 15 minutes, and distribute the color samples evenly after 4 hours of production To view the degree of color change. If the color starts to change every 50 minutes, then you need to start the ink adjustment in about 40 minutes. 3. After completing the above two items, taking the middle number for production monitoring can ensure that the color remains consistent. 3. Make reasonable adjustments according to the characteristics of factory equipment Because the structure of each equipment is different, and the process of the anilox roller is also different, the colors printed are also different. Therefore, it is necessary to use the equipment reasonably according to the factory to achieve the intended purpose. Controlling colors requires not only the use of ink, but also the use of equipment. In the production operation, in order to achieve the best printing effect, we must establish standard operating rules, that is the direction of enterprise development.
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Why are different colors printed in the same bucket of ink?