METHOD AND DEVICE FOR PRODUCING A STRUCTURED SURFACE ON A STEEL EMBOSSING ROLLER

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...

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Bibliographische Detailangaben
Hauptverfasser:	REISSE, GÜNTER, LICKSCHAT, PETER, WEISSMANTEL, STEFFEN, STEFFEN, WERNER, BOEGLI, CHARLES
Format:	Patent
Sprache:	eng ; pol
Schlagworte:	CLADDING OR PLATING BY SOLDERING OR WELDING CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING LINING MACHINES MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR PERFORMING OPERATIONS PRINTING PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTINGSURFACES SOLDERING OR UNSOLDERING STAMPS TRANSPORTING TYPEWRITERS WELDING WORKING BY LASER BEAM
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Beschreibung
Zusammenfassung:	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.