The color of the carton is printed in different shades, which is a relatively common quality problem in the industry. Inconsistent printing of carton colors will seriously affect the image of customers' products, so large companies such as Mengniu and Wahaha have very strict requirements for printing colors. But, did you make it? Most of the reasons for printing color shades come from ink. Therefore, if you want to solve the problem of different printing colors, you must get rid of the ink, and control from the source to ensure that the printing colors are consistent!
Today, we will talk about how to solve the problem of inconsistent printing colors from the aspects of ink management, ink color card establishment, ink use, and ink use on the machine!
Strengthen ink control
Many factories have relatively weak control over inks during the use of inks, and rarely monitor and monitor inks. Under normal circumstances, it is found that there is a problem with the ink before going to the ink supplier to solve it. Well, at this time, the printed matter has gone wrong, that is, it has caused factory losses.
Establish a standard ink color card
If the printing workshop is still producing the control sample box, then our printing color control is more difficult. The color changes when the sample box is left for a long time, and there are certain difficulties in comparing the color of the sample box. Therefore, the carton printing unit must establish a standard color card management standard.
The color card standard is based on the color confirmed by the customer. The factory uniformly issues the color to the quality, sales, and production according to the customer's confirmation. In this way, a unified understanding of the colors inside the customer and the factory can be formed, which can avoid some skinny phenomena.
Check the PH value and viscosity of the ink before the ink is used
The unit that receives the ink before leaving the warehouse should confirm the ink weight, ink number, ink color, etc. The most important thing is to check the PH value and viscosity of the ink. After the color of the ink is determined, the ink supplier should record the viscosity value and PH value of the ink formulation, and the same value before the next export. Then, the ink color can be guaranteed.
Pay attention to the water in the ink return system when the ink is on the machine
When the ink is on the machine, pay attention to the water in the ink return system. If there is a lot of water in the ink return system, then the color of the ink on the machine will become lighter. At the same time, the ink wastewater that was not cleaned in the previous batch may be mixed into the ink to be printed, causing the color difference of the printed product.
Before using the machine, the ink must be stirred before using the machine. Otherwise, too much resin precipitation at the bottom of the ink tank will cause the bottom viscosity to be too high. When the ink is pumped up, the ink is darker, and it becomes lighter when it is stirred during the printing process, so this detail needs attention.
Ink use should be stirred, tested and retained
When the product starts normal production, it is necessary to stir the ink in the ink tank every 15 minutes or so, and check the ink viscosity once every half an hour. In this way, in the production process, the printing color chromatic aberration caused by the change of ink viscosity can be monitored. Secondly, in the production process, a sample should be left every 2000 sheets. After tens of thousands of sheets are produced in this way, as long as the stock is compared with this color, the color change of this batch of printed products can be confirmed.
After the ink is used, check the viscosity and PH value of the ink and adjust it when returning it to ensure that it can be used normally next time, to avoid ink problems when it is used again, which will cause printing shutdown.
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