Fault 1 Regular and irregular line marks (knife line)
1, regular line marks cause:
(1) The ink is mixed with residue to scratch the squeegee;
(2) Plates can be scratched by hard objects;
(3) The plate cylinder wears off chromium and the copper layer is exposed.
Solution:
(1) Re-filter the ink with 80 mesh copper wire, and use 600 water sandpaper to sharpen the blade or replace the ink knife;
(2) Finely grind the scratched area with 800-grit water-sandpaper;
(3) Clean the plate with solvent, fill the scratch with 502 glue and copper powder, and gently sand it with fine sandpaper (Note: This method is suitable for short-run products).
*(2),(3) only for non-graphical parts.
2, irregular line marks cause:
(1) The sharpness of the squeegee blade is not enough;
(2) The inclination of the squeegee is not enough and the squeegee pressure is too small;
(3) poor smoothness when installing the squeegee;
(4) The solubility and fluidity of ink and solvent are not good;
(5) The surface treatment of the chromium layer of the plate cylinder is not smooth and rough;
(6) The printing roller prints large when it rotates circumferentially;
(7) Ink residue in the ink sticks behind the blade'
(8) The ink tube and the position are not ideal, and the ink flows into the ink tank too quickly, causing ink unevenness.
Solution:
(1) Using 600 water sandpaper to sharpen the blade;
(2) Increase the pressure of the squeegee so that the tilt angle is downward, and move the blade holder according to the actual situation. The ideal contact angle is 50-70 degrees;
(3) When inserting the blade, try to use a rag to clamp the bead and the blade, pull the force to the outside, and simultaneously tighten the screws from the middle, one by one outward, but the tightening screw can not be in one step, without repeating two or three times to complete , so that the blade force evenly;
(4) control the ink viscosity (without affecting the printing effect under the premise), as far as possible the use of strong solubility, deep volatile agent, such as ethyl acetate, ethanol, adding a small amount of isopropanol, can increase the gloss;
(5) Use No. 800 or No. 600 water sandpaper solvent to grind the printing plate cylinder back and forth, pay attention not to force too much when grinding to the graphic part, if not ideal, you can contact the plate making system to make the plate cylinder;
(6) Check whether the printing plate cylinder, drum shaft, bearing and transmission gear are deformed and worn, or it may be caused by the unstable and unstable level of the machine base;
(7) Ink tank, ink tank cleaning, multi-layer ink filtration;
(8) Move the ink tube position or reasonably improve the ink tank structure. (To be continued)
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