The moiré pattern is believed to be familiar to everyone, and the vignette is: After the development of the edge of the screen mesh holes are not all become through holes, graphic edges are uneven, like the wind around the moon ring ring.
Ways to prevent moire:
1, when the plate separation, select the appropriate screen, correctly grasp the direction of the screen points and the angle of the screen through the wire
2. It is necessary to match the number of screen meshes with the number of screen lines, and the screen number and the number of screen lines are often selected in a ratio of more than 3 times.
3, choose a good color screen angle. When the color is normal, 45 degrees; in the case of two colors, the main color angle is 45 degrees, and the secondary color is 15 degrees; in the four colors, Y 0 degrees, C 15 degrees, M 45 degrees, and K 75 degrees.
4, as far as possible the selection of narrow diameter single wire mesh and low mesh mesh.
Vignettes are often seen in direct plate-making methods. The reasons are:
1, using white silk plate making
2. When the printing plate is negatively bonded to the screen plate
Its prevention method:
1, using colored wire mesh plate (usually commonly used yellow)
2, using pre-painted veneer to prevent the solution (first painted varnish to prevent liquid, dry, and then coated sensitized adhesive)
3, when printing, pay attention to the plate and the screen plate printing paste, close.
4, increase the vacuum time.
Source: Print Channel
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