It is inevitable that you will encounter various small problems when using laser marking machines on a daily basis. Among them, uneven marking is a common problem. Although it is a small problem, it has a great impact on the enterprise because the markings are uneven. It will directly affect the marking quality of the product, processing efficiency, the external image of the product, and even the display of the external image of the company.

How to deal with it quickly, prevent the degradation of marking quality, and reduce the impact of equipment shutdowns on output has become the most concerned issue for users. Based on years of experience, Foshan Fulan Laser has analyzed and integrated some of the main causes of uneven laser marking for your reference:

1. The laser is attenuated

When the laser is attenuated, uneven marking will also appear. If the service life is too long, it will cause attenuation, so you can replace it with a new laser.

2. The off-focus marking is used

Because each focusing lens has a corresponding focal depth range, and the use of off-focus methods will easily lead to a large-scale marking pattern, the edge is at the focal depth critical point or exceeds the focal depth range, which is easier to cause ineffective results. Uniformity. Therefore, the off-focus marking method must consider the problem of laser energy.?

3. The laser output spot is blocked

The lens is defective, the laser output head or the fixed fixture and the galvanometer are not adjusted properly, which causes part of the laser spot to be blocked when the laser passes through the galvanometer, and the displayed spot is non-circular, which may also cause uneven marking effects. .???

4. The lens is damaged

If the lens is damaged, the laser energy of the laser beam passing through the damaged area of the lens and the non-damaged area of the lens will be inconsistent, and the final laser energy acting on the material will be different, which will result in uneven marking effect.?

5. Thermal lens phenomenon???

When the laser passes through the optical lens (refraction, reflection), it will cause the lens to generate heat and produce slight deformation. This kind of deformation will increase the focus of the laser and shorten the focal length. After turning on the laser for a period of time, the energy density of the laser acting on the material will change due to the phenomenon of thermal lensing, resulting in uneven marking.?

6. The machine level is not adjusted properly ??

The laser vibrator lens or the field lens lens is not parallel to the processing table, which will cause the laser beam to reach the processed object with inconsistent length after passing through the field lens. In the end, the energy of the laser falling on the processed object will have an inconsistent energy density. The effect is uneven in the material.??

7. The position and direction of the beam mirror are not accurate

If the beam expander is not adjusted properly, the laser power will drop; the laser intensity in the marking area is uneven; the computer software setting center deviates from the physical center of the light output of the vibrating lens; the beam expansion effect cannot be achieved. Therefore, when the position and direction of the beam mirror are not correct, the marking effect will also be uneven.

8. The reason for the material

When the material coating thickness is not uniform, or some other physical and chemical treatment processes are not uniform enough, or the polymer is not uniformly distributed, the laser marking effect will also be uneven.