Flexible Plates Answers Collection (38-47)

38. What happens when water-pattern defects occur during printing?

Cause: The surface of the plate has a dry mono-base polymer; after drying, the plate is solved by hand.
Countermeasures: Remake the plate; wipe the plate with new solvent when dry;
After drying, clean the plate with a clean cloth soaked in solvent.

39. How does a large area of ​​orange peel appear when printing?
Cause: Vacuum is not uniform during plate making; improper operation after removing the plate protective film.
Solution: Use matt film to make negative images; do not bend the plate after removing the plate protective film.

40. What happens when there is a large amount of white spots on the spot when printing?
Cause: The plate was corroded by solvent or solvent vapors before processing; too much trichloroethylene in the solvent.
Countermeasure: Rinse immediately after exposure and do not place; add trichloroethylene in a 3:1 ratio.

41. What if the plate is loose from the gripper of the processor?
Cause: The screw is loose; the tension is not correct; the plate position is incorrect; the brush pressure is too high.
Countermeasures: Tighten the six screws; adjust the clamp tension; properly install the plate; reduce the brush pressure.

42. What if the plate bends in the processor (especially for large format plates)?
Cause: The end of the plate is bent.
Countermeasures: Cut off the trailing edge of the clamp; cover the end when exposed.

43. How to solve the uneven bottom plate?
Cause: Some UV lamps are out of date or have gone out; uneven brushing or brushing time is not enough.
Countermeasures: Replace the lamp; repair the brush or extend the brush time.

44. How to deal with uneven layout?
Cause: The rinsing fluid is too old; the final wash of the layout is not sufficient.
Countermeasure: Replace with new flushing fluid; fully wash the layout.

45. How to deal with wrinkled surface of printing plate?
Cause: Long brushing time; incorrect solvent ratio; no post-treatment.
Countermeasures: Shorten brushing time; ensure proper proportioning of solvents; post-processing.

46. ​​How to solve the crack on the surface of the printing plate?
Reason: Flexo is placed under strong sunlight; defoaming time is too long; after exposure is excessive; indoor ozone concentration is too high; post-processing time is too long.
Countermeasures: Place the flexo plate in a dry and dark place; shorten the tack time; reduce the amount of post exposure; ensure indoor air circulation;

47. How about the difference in plate thickness?
Causes: Drying speed is too fast; Dryer malfunctions; Dryness is excessive; Dry air is too hot; Washing time is too long; Washing depth is too deep.

Countermeasures: Ensure proper drying speed and degree of drying; shorten wash time: reduce wash plate depth.

From: Long Chen Printing Technology Network