Method and device for producing a structured surface on a steel embossing roller
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United States of America Patent
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Jan 22, 2019
Grant Date -
Aug 7, 2014
app pub date -
Sep 12, 2012
filing date -
Sep 23, 2011
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Abstract
A method for structuring a steel embossing roller surface includes using a short pulse laser including at least one of a femtosecond laser and a picosecond laser. The structuring is macrostructuring with dimensions of over 20 μm and depths up to 150 μm and more. The short pulse laser has: in single pulse operation, a fluence in the range of 0.5 J/cm2 to 3.5 J/cm2, and in burst operation, a mean burst fluence of 0.5 J/cm2 to 70 J/cm2 per pulse; a wavelength of 532 nm to 1064 nm; a repetition rate of 1 kHz to 10 MHz; a pulse to pulse spacing on the roller of 10% to 50% of the beam diameter for the femtosecond laser and of 10-25% and 40-50% of the beam width for the picosecond laser; a laser pulse position near the roller surface; and deflection velocities of up to 100 m/s and more.
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