Analysis and elimination of common faults in flexographic printing process

In recent years, the flexographic printing method has developed rapidly in China, especially in product packaging, more and more flexographic printing methods have been adopted. However, in the actual production process, due to the influence of printing materials, ink performance, printing machinery, working environment and other factors, some printing failures often occur, affecting the smooth production and the quality of the final printed matter.

Fault one: paste version

the reason:

1. The plate relief is too shallow;

2. Excessive printing pressure;

3. Too much ink supply;

4. The viscosity of the ink is too high;

5. The ink dries too quickly.

Solution:

1. Re-making the plate, appropriately reducing the back exposure time, and increasing the depth of the plate relief;

2. Appropriately reduce printing pressure;

3. Properly reduce the ink supply;

4. Reduce the viscosity of the ink;

5. Reduce the intensity of hot air drying, slow down the vehicle speed appropriately, or add an appropriate amount of slow drying agent.

Failure 2: Sticky

the reason:

1. Insufficient drying of ink;

2. The viscosity of the ink is too high;

3. The rewinding tension is too large.

Solution:

1. Increase the drying temperature, or add an appropriate amount of solvent that evaporates quickly;

2. Reduce the viscosity of the ink;

3. Reduce the rewinding tension.

Fault 3: Overprinting is not allowed

the reason:

1. Improper tension;

2. Improper arrangement of printing color group;

3. Mechanical vibration or mechanical deviation;

4. The printing material is uneven;

5. The temperature and humidity in the printing workshop are inappropriate, the temperature of the drying box is too high, and the paper, especially the plastic film, has contracted seriously.

Solution:

1. Adjust the unwinding and winding tension;

2. Re-adjust the printing color sequence, arrange the color with strict registration requirements in the adjacent color group to print next to prevent deviation, if necessary, you can properly pad one or two layers of transparent under double-sided tape tape;

3. Check the machinery and adjust the corresponding machine parts;

4. Adjust the tension, or replace the printing materials;

5. Reduce the drying temperature and try to keep the temperature and humidity constant in the workshop. If possible, install an air conditioner in the workshop.

Fault four: poor color stacking effect

the reason:

1. Insufficient drying of the previous color ink;

2. The viscosity of the latter ink is too high.

Solution:

1. Add an appropriate amount of volatile solvent to increase the drying speed of the previous color ink;

2. Decrease the viscosity of the latter ink.

Fault five: ink foaming

Cause: The printing speed is too fast, and the defoamer is not used or the amount of defoamer is insufficient.

Solution: Add an appropriate amount of defoamer, or appropriately reduce the printing speed.

Home Office Desk

Product categories of Home Office Desk, we have years of experience in the manufacture of furniture, home office desk, Cabinet Furniture and Storage Furniture suppliers/factory, wholesale high-quality products of Study Desk , Gaming Desk and Working Desk. We have the perfect after-sales service and technical support. We hope we can cooperate happily.

Home Office Desk,Office Desk,Executive Desk,Home Desk

Baklam , https://www.baklamjm.com