How to great laser marking in Packaging Printing

The application of laser marking machines in the packaging and printing industry is increasing year by year. The anti-counterfeiting of packaging for tobacco, alcohol, medicine, cosmetics and other products cannot be separated from the laser marking machine. During the marking process of the laser marking machine, if you encounter common quality problems, you can use the following methods to solve:

1. The marking pattern of the laser marking machine is partially unclear

Cause: The thickness of the mold plate is not uniform. The mold pressure is too small. The heating temperature is too low or the machine accuracy is not high.

Solution: Check whether the thickness of the mold plate is uniform. Whether the mold pressure is too small. The temperature is too low. The accuracy of the machine is reduced.

Key points of process control: The thickness error of the stamping plate should be controlled within 0.001mm. The hardness should be maintained at 230-280N / mm. Because the hologram is embossing interference fringes by applying a certain pressure to the embossing roller. If the hardness of the embossing plate is insufficient, the internal stress will deform or damage the embossing plate.

2. The marking pattern of the laser marking machine is dim

Cause: Generally related to heating temperature and molding pressure.

Solution: Check if the heating temperature is too low. Whether the molding pressure has dropped.

Key points of process control: The setting of the molding pressure should comprehensively consider the type of the molding temperature holographic material or the softening point of the coating layer and the situation of the molding plate. The pressure is too high. The mold plate is easy to be damaged. Or the holographic material is crushed; the pressure is too low. The mold image is unclear and incomplete. Slowly increase the pressure of the pressure roller evenly to 030 ~ 0.50MPa. The molding speed can be comprehensively adjusted according to the performance of the embossing quality machine.

3. The logo of the laser marking machine is whitish

Solution: Check if the molding speed is too slow. If the molding temperature is too high.

4.Laser marking machine for laser marking machine

Cause: The hot-pressing temperature is higher than the degradation temperature, and the viscosity of the coating is increased. It will cause sticking and the film will be wound on the holographic impression roller.

Solution: Reduce the hot pressing temperature.

5. The marking pattern of the laser marking machine is clear and blurred

Cause: The temperature distribution of the hot pressing device is uneven or the mold plate is uneven.

Solution: Check whether the temperature distribution of the hot pressing device is uniform. Whether the mold plate is deformed or worn.

6. The marking film of the laser marking machine is wrinkled horizontally (vertically)

Cause: Improper tension control during unwinding or rewinding.

Solution: Properly adjust the unwinding tension or winding tension until wrinkles are eliminated.

If you still don’t understand, please contact Focuslaser .