The output wavelength of traditional C02 laser cutting machine is concentrated at 10.6 μ m. The new C02 laser cutting machine can flexibly select the actual laser wavelength. There are two ways to obtain different wavelengths: (1) inserting a wavelength selection optical element into the laser folding cavity structure will produce other wavelengths, such as l0.2 μ M wavelength; (2) The isotope of C02 molecule is used as the medium to produce a wavelength of 9.41xm.
Why different from 10.6 μ M. the main reason is that the infrared absorption spectrum of most polymer films contains several peaks. Therefore, the small change of laser wavelength may have a great impact on the absorption coefficient. The films used in flexible packaging are very thin, and usually can only absorb a small part of the laser power. Therefore, by adjusting the wavelength to increase the absorption coefficient of the film, the processing speed at a given laser power will be greatly improved.
The research shows that for the unstressed polypropylene film, 10.6 μ M and 10.2 μ M laser processing, there is only a small difference in processing speed. But for commonly used BOPP film (30-50 μ M thick), the difference is very obvious.
Laser cutting machine is widely used in cutting plastic film. It can quickly sample and quickly complete the finished product. It is suitable for all kinds of film proofing users and is very convenient.