Eight major failures in the process of plate making

Plate making is an indispensable step before printing. It is a collective name for copying originals into plates. The factors affecting the quality of printing plates in platemaking are the most, often causing defects such as blank printing plates, missing dots, and blurred images.

1, blank blank block jam

1 Back exposure time is too long, should pay attention to the correct control of the back exposure time;

2 The main exposure is excessive. Under the premise of ensuring the reproduction of small texts and thin lines, the main exposure time should be shortened as much as possible.

3 The contact between the plate and the film is poor, and the vacuum system should be ensured to work normally, and the roller is used to drive off the air between the plate and the film.

2. Small outlets, small prints, thin lines are washed out

1 Back exposure time is not enough, consider increasing the back exposure time;

2 main exposure time is not enough, can increase the main exposure time;

3 Washing time is too long or the brush pressure is too large. Pay attention to shorten the washing time and adjust the brush pressure.

3, small outlets lose trouble during printing

1 main or back exposure is insufficient, can increase the main exposure or back exposure time;

2 The original design exceeds the flexographic reproducibility range, improving the manuscript design to suit the flexo technology range.

4, the bottom of the plate is not completely hardened

1 lack of back exposure, increase back exposure time;

2 Incomplete flushing, residual uncured resin remaining, checking brush pressure and adjusting wash time.

5, the same plate wash depth inconsistency failure

1 The printer is too hot and carefully inspect the ventilation and cooling system for malfunctions.

2 uneven intensity of the printing lamp or open the synchronization, while replacing all the lamp;

3 wash brush is not parallel or unbalanced action, adjustable wash brush pressure and level.

6, the image part is not clear fault

1 film is defective, carefully check the image on the film is clear;

2 Wrong offset printing film is used for flexo printing and remanufactured qualified flexo film.

7, thin lines curved wave failure

1 lack of back exposure, to increase back exposure time;

2 lack of main exposure, to increase the main exposure time;

3 lack of drying time, to increase the drying time;

4 wash plate water is not fresh, replace the fresh wash plate water;

5 washing time is too long. Adjust the wash time.

8、Fault caused when moving and bending after field and text plate making

1 The main exposure and back exposure time is too long to reduce the main exposure and back exposure time;

2 In addition to sticking time is too long, reduce the sticking time;

3 The main exposure and back exposure are insufficient, check the lamp for damage or aging.