Common problems in plate making and solutions

1. The blank part of the printing plate is the cause of the plugging failure and the processing method:

1 Back exposure time is too long. Care should be taken to properly control 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. The vacuum system should be ensured to work normally, and rollers should be used to drive off the air between the plate and the film.

2. Small outlets, small prints and thin lines are washed out. Causes and Solutions:

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

3. The reason why the bottom of the plate is not completely hardened and its treatment method:

1 Back underexposure. Increase the back exposure time; 2 flushing is not complete, there is residual unhardened resin retention. Check the brush pressure and adjust the wash time.

4. The inconsistency of the same plate wash depth causes the failure and how to deal with it:

1 Shaiban machine is too hot. Carefully inspect the ventilation and cooling system for any malfunctions; At the same time, replace all the lamps; 3 washing brush is not parallel or the action is not balanced. Adjustable brush pressure and leveling.

5. Part of the image is blurred and the cause of the fault is as follows:

1 film is defective. Carefully check that the image on the film is clear; 2 wrongly use offset film for flexo printing. Reproduce qualified flexo film.

6. The reasons for the loss of small outlets during printing and their handling methods:

1 Insufficient main or back exposure. Can increase the main exposure or back exposure time; 2 original design beyond the flexographic reproduction capabilities. Improve manuscript design to suit flexographic technology.

7. Rupture failures and handling methods when moving and bending after field and text platemaking:

1 The main exposure and back exposure time is too long. Can reduce the main exposure and back exposure time; 2 removal of sticky time is too long. Reduce the removal time; 3 main exposure and underexposure. Check the lamp for damage or deterioration.

8. The thin lines are curved and wavy. Causes and Treatments:
1 Back underexposure. To increase the back exposure time: 2 The main exposure is insufficient. To increase the main exposure time; 3 lack of drying time. To increase the drying time: 4 wash plate water is not fresh. Replace fresh wash water; 5 wash time is too long. Adjust the wash time.

Source: China Design Printing Network