Prints embellish people's lives and add brilliant colors to people's lives. So what are the characteristics of qualified printed matter? What issues need to be paid attention to during the printing process?

1. Gray balance. According to theory and experience in production practice, the most difficult color to control in printed matter is gray balance. Gray balance means that under certain printing suitability, the three primary color plates of yellow, magenta, and cyan are combined and overprinted according to a certain dot ratio from light to dark to obtain achromatic colors of different brightness (white, light gray, gray, dark gray, and black), that is, Obtaining a visually neutral gray color depends on many factors. The amount of ink used in printing, paper, full density, dot area, overprinting and screen line number will all have an inextricable impact on the gray balance. This It is the most test of the overprinting accuracy of the machine and the skill level of the operator.

   
   

2.  For 4-color screen printing and 3-color screen printing, do not print in full color (it is recommended to use spot color printing).

   
   

3.  Things designed by people who don’t know how to print are the most difficult to print. Color is one aspect. There are too many multi-colors with extremely thin lines and extremely small characters that are white and so on.

   
   

4.  For a large flat screen with C=50M=50Y=50K=50, the color cast will be serious if it is not accurate at all.

   
   

5.  The characters are in four colors, that is, there are characters in the four colors in cmyk. Especially the very small characters are difficult to put on, and the machine's gripper teeth are extremely demanding. This is also a relatively common problem, so the pre-press designer must check the black text in the publication file before output, especially the small text, to see if it is only on the black version and should not appear on other three-color versions. If it occurs, the quality of the printed finished product will be greatly reduced. When the RGB graphics are converted to CMYK graphics, the black text will definitely become four-color black. Unless otherwise specified, this must be treated.

   
   

6.  Also, the black background is not easy to handle. For the black background, you can use extra black ink or print it twice to achieve the effect. It is not difficult to print, but it is more labor-intensive.

   
   

7.  The superposition of several color dots, especially more than 70% of the dots. Specifically, dark brown, brown, dark green (flat screen, containing blue 70), dark blue, purple blue, etc. are difficult to print due to color differences that are difficult to find balance on the printing machine.

   
   

8.  In printing, it is generally difficult to follow the color of things with full-page printing, spot color full-page or large area, reverse white characters, the same logo, and the same color blocks, and it is easy to produce color aberration, ghosting, smearing, and scratching. injury phenomenon.

   
   

   In short, qualified printed matter must meet: 1. Accurate overprinting; 2. Uniform ink color; 3. Full dots; 4. Balance of ink and ink; 5. The printed product must have no printing faults, such as smudges, scratches, patterns, pastes, etc.; 6. , Strictly faithful to the original manuscript. Printing companies must pursue high-quality prints to adapt to people's increasing aesthetic concepts.

   
   

   2021.11.9