This paper presents selected results of research on the ablative removal of a polymer paint coating with a metallic filler (aluminum micro-flakes) using laser technology. A fiber laser with the following parameters was used for laboratory tests: radiation wavelength λ=1064 nm, laser pulse exposure time τ = 25 ns, repetition frequency 30-500 kHz with a Galvo head. By varying the power density, frequency, pulse overlap degree, and scanning speed, various effects of removing the paint coating system were obtained. At low power densities, melting of the clear coat occurred. Multiple scanning with a laser beam of higher power density resulted in the sequential removal of the paint coating from several to several dozen micrometers. This technology holds very good prospects for the renovation of paint coating systems used in modern motor vehicles (bodies, frames).THE TECHNOLOGICAL USAGE OF LASER CLEANING IN THE CAR VARNISHING COATS ANALYSIS
The chosen investigation results of polymer varnish coat with metallic filler (microtiles of aluminium) ablational removing by laser technique were introduced.
To the laboratory investigations fiber laser with following parameters: the radiation wave length λ = 1064 nm, the exposition time of the laser impulse τ = 25 ns, the repetition frequency 30-500 kHz with the Galvo was used. Changing the density of the power, frequency, the degree of the impulses covering, the speed of scanning, the various effects of removing varnish coats system were got. The melting of the colourless varnish coat were spot when the small density of power was used.
Multiple scanning by laser bundle with higher power density resulted in sequencial removing the varnishing coat from several to tens micrometers. This technology augurs very good perspectives in the renovation of varnishing coats systems applied in present car vehicles (bodies, frames). (…)
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Source: Logistyka Magazine