Why does CE uv laser marking on plastic change color?

Due to the extremely small focusing spot and the small processing heat affected zone, the UV laser marking machine can perform ultra-fine marking and special material marking. It is the first choice for customers who have higher requirements for marking effect.

Careful friends will find that when the UV laser marking machine marks on plastic materials, it will show a black with clear marking effect. If you don't look carefully, you may think it is the masterpiece of the ink jet printer. The working principle of the machine is to use a higher-energy laser beam to destroy the surface of the object to achieve the marking effect. If it is metal, the color changes, we can understand that the background color of the material is printed, but there is an essential difference between plastic and metal. , What is the reason for the discoloration of plastic material marking? This is also the key point that Ollance wants to share with you today.

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The UV laser marking machine marks on plastic materials, and the principle is that it changes the color under the surface of the material, such as carbonization. When using a UV laser marking machine, the blackening marking effect is achieved by selectively carbonizing the lower layer of the plastic surface by the UV laser marking machine. The input of heat energy is limited to a small designated area, so that the marking content and the background material are clearly distinguished, which is easy to identify, and gives us a very clear and beautiful visual experience.