Technology and Mechanism of Laser Marking on Aluminum Foil Composite Film
In order to achieve permanent and environmentally friendly information marking on the aluminum foil PET composite film and overcome the limitation of the melting and penetration of the aluminum foil caused by laser energy concentration,a 1064 nm nanosecond laser was used in single factor tests to study the effect of laser pulse frequency on the color difference of white figure on aluminum foil PET composite film.The cause of white color and the formation mechanism of color difference of the marked zone on the composite film was discussed.When the pulse frequency increases from 121 kHz to 151 kHz,the color difference of the laser marked area increases with the increase of the pulse frequency.With the further increase of the pulse frequency from 151 kHz to 169 kHz,the color difference decreases firstly then increases.It was found that the white color is derived from the random reflection of visible light by the surface structure of the marked area on the aluminum foil.The multiple reflection consumption of visible light by the center pit in the marked area of the aluminum foil is the main reason of the formation of chromatic aberration.
laser markingaluminum foil PET composite filmcolor difference
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