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What is 4 PASS printing ?
2016-08-25 15:29:50
During the printing process, we often meet the word "PASS", and we can see that different pass printing corresponds to different printing speed in the printer specification. Take YOTTA YD-F3216R5 UV flatbed printer as a sample, the print speed is described as three kinds: 4 PASS, 38 M2/hr; 6 PASS, 29 M2/hr; 8 PASS, 22M2/hr. So, what is the meaning of 4 PASS, 6 PASS and 8 PASS in UV printing ?
In UV printing, "PASS" refers to the number of printing times the screen forming needs, or the folds of unit area. For example, 4 pass printing means that a pixel needs to be completed by 4 times printing. 
How many pass printing you choose, means that how many times you print to complete the image. It is usually to say that divide the nozzles into several parts to superimposed cover. Higher the pass is, higher the image quality is, but it does not mean higher resolution the images are. The "PASS" is no relationship with printing resolution, but only more delicate, or precision. 4 PASS printing and 6 PASS printing is common in UV printing devices.
You can also interpret it like this: you print a picture of 720 X 720 dpi output with 8 pass and you need to print 720 dots in a line. You print eight times and it prints 90 dots each time. The more nozzles your printer has, the more pass you can choose. 
Almost every machine has standard PASS numbers, such as 4 PASS, 6 PASS, some have 8 PASS. The change of PASS number will bring a great deviation to image colors. If you has a pursuit of printing quality, don't choose the lower PASS printing which has fast speed but poor quality. Normally, the normal mode is enough for almost printing. The pass number can be set according to actual requirements.

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