Due to the high-density energy characteristics of the laser, it is easy to burn or yellow when laser processing or laser cutting materials, laser engraver for sale ，especially light-colored materials (such as transparent, white, beige, etc.), or special materials.

To avoid this phenomenon, the material surface needs to be protected during laser processing. The usual way is:

The protective film must be flat and tight, without air bubbles. Adding a certain amount of inert gas-nitrogen during laser processing can avoid the scorching phenomenon to a certain extent. Adjust the laser processing parameters and use the method of multiple small firepower.

like：

What are the pros and cons of laser engraving? 

What are the advantages of laser engraving technology 

How does a laser engraving machine work?