What is the reason for the color difference in the pattern after printing on digital printing?
There are 7 reasons for the color difference in the image output:
1. paste head, frequent cleaning of the print head caused by
Faults such as pasting and breaking inks require frequent cleaning of the print head, which may result in chromatic aberration on the screen and discontinuity of the picture. Because the print head is cleaned before and after, the effect will be quite different. We recommend that the digital printing machine be inspected before the digital printing is printed to ensure that it can be produced without errors. Secondly, the quality of the ink needs to be purchased. Excellent, quality guaranteed ink.
2. the quality of the media
Compared with inferior media, the ink absorption is not strong (uneven), resulting in uneven ink, and the image is prone to chromatic aberration.
3. the ink supply system is unstable (especially the ink cartridge level)
The level of the ink cartridge level greatly affects the ink supply power of the print head, which directly affects the printing effect. When the liquid level is high, the color is deeper than when the liquid level is low, which leads to the color difference of the picture;
What is the reason for the color difference in the pattern after printing on digital printing?
4.other processing in the printing process
Other processing may be to change media during printing (large stitching), to change ink or to fill different types of ink, to pause too long during printing, or to pause too often. All of the above operations may cause the picture to be discontinuous and the image output to have chromatic aberration.
In order to avoid the above situation, we need to check whether the media and ink are sufficient before printing, and find problems that need to be replenished in time. It should be noted that a digital printing machine with a heating and drying device has a pause time that is too long to print a few PASS images before and after the pause, and the color difference is greatly different;
5. the print head operating voltage is unstable or change the voltage during the printing process
The working voltage of the print head directly affects the ejection force of the ink droplets (especially the piezoelectric print head), and thus, from the overall visual effect, there are different effects of different shades and different definitions. Therefore, before the printout, the printhead voltage should be set to normal (usually adjusted in software), and the input end of the printer should be connected to the voltage regulator.
6. negative pressure instability
For printers that use the negative pressure principle to supply ink, the negative pressure is unstable, which also directly affects the ink supply pressure of the print head, thereby affecting the inkjet effect of the print head;
7. the printer is different
In the same picture, different machines or printing under different conditions (mainly for large screens that need to be spliced), even for different printers of the same model, the printing effect (color difference) has different differences. On the whole, there is a color difference. Therefore, if there is a picture that needs to be spliced, try to use the same printer to print on the same conditions, in order to maintain the overall effect and continuity;
The above 7 points are the 7 reasons for the color difference of the image output. Do you understand it? The daily production of digital printing needs to pay attention to a lot, especially the ink used, pay attention to quality and standard operation.