Method and device for producing a structured surface on a steel embossing roller

US10183318B2 · kind B2 · utility

Assignee

• BOEGLI-GRAVURES SA · CH

Inventors

• Charles Boegli · Marin-Epagnier, CH
• Steffen Weissmantel · Chemnitz, DE
• Günter Reisse · Chemnitz, DE
• Peter Lickschat · Grimma, DE
• Werner Steffen · Stans, CH

Key dates

• Filing date: Sep 12, 2012
• Grant date: Jan 22, 2019
• Expiry date: Dec 31, 2033

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B41C1/05
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

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.