How to solve the problems encountered in the printing process of self-adhesive coated paper?

Self-adhesive coated paper may encounter a variety of problems in the printing process, the following are some common problems and their solutions:

First, printing quality problems

1. The ink layer is uneven

Reasons: uneven printing pressure, improper ink viscosity, fluidity, or poor pad technology.

Solution: Adjust the printing pressure to ensure uniform and moderate; Adjust the viscosity and fluidity of ink according to the characteristics of coated paper; Optimize pad technology to ensure uniform and bright ink layer.

2. Depowder and print layout appear dark

Reason: coated paper surface coating, paper surface pressure is too large easy to crush the powder, or the ink layer is too thick, too sticky.

Solution: Check the plate loading process to avoid heavy plate pad; Adjust the ink consistency, using the method of "deep ink thin printing" to reduce the chance of imprinting over the bottom and prevent the overlapping color printing.

3. Imprinting indistinct

Reason: insufficient printing pressure, poor ink drying.

Solution: Increase the printing pressure appropriately to ensure that the dot blot is clear; Add drying oil to the ink appropriately to speed up the drying speed of the ink.

Second, die cutting and processing problems

1. Die-cutting

Cause: die cutter wear, die cutting pressure is insufficient, or the material running tension is unstable.

Solution: Check and replace the worn die cutter; Adjust the die cutting pressure to ensure sufficient and uniform; Check and adjust material running tension to maintain stability.

2. Die cutting overflow

Cause: self-adhesive material glue overflow, or die cutter is not suitable for the material.

Solution: Choose a die-cutting knife suitable for self-adhesive material; Adjust the die cutting process to avoid glue overflow; Special treatment of glue if necessary to reduce the possibility of overflow.

3. Label crimp

Cause: moisture absorption of self-adhesive material or improper control of temperature and humidity in workshop.

Solution: Strengthen the control of temperature and humidity in the workshop and maintain appropriate environmental conditions; Pre-treatment of self-adhesive materials, such as humidification or drying, to reduce curling.

Third, other issues

1. Sticky and dirty problem

Reason: coated paper ink absorption is weak, the back is smooth, and it is easy to sticky and dirty when the ink is large or multi-color overprinting.

Solution: Add appropriate amount of anti-stick agent in the ink and stir evenly; Optimize the printing process to reduce the possibility of sticking; If necessary, use UV glazing or film coating process for protection.

2. Poor bronzing

Reason: hot stamping temperature, pressure is insufficient, or hot stamping foil and coated paper does not match.

Solution: Adjust the temperature and pressure parameters of the hot stamping machine; Choose gold foil that matches the coated paper; Check whether the hot stamping plate is smooth and without damage.

Sum up

To solve the problems encountered in the printing process of self-adhesive coated paper, multiple aspects need to be considered comprehensively, including printing quality, die-cutting processing, environmental control and so on. By adjusting the printing process parameters, optimizing the equipment status, strengthening the workshop management and other measures, it can effectively improve the printing efficiency and quality, and reduce the generation of defective products. At the same time, different solutions need to be adopted for different problems to ensure that the self-adhesive coated paper can proceed smoothly in the printing process and obtain satisfactory product results.