US 10,245,677 B2 · Laser decoating of coated metal sheets

Abstract

Methods, devices and systems for laser decoating of coated metal sheets, in particular for removing a metal protective layer from a metal sheet by a laser beam. The laser beam is directed onto a surface of a metal sheet coated with a metal protective layer, such that the laser beam strikes the surface of the metal sheet at a laser spot and melts material of the metal protective layer. A gas is directed by a plurality of nozzles at a pressure of at least 3 bar and at an acute angle with respect to the laser beam onto the laser spot. The nozzles are arranged around the laser beam such that the gas directed from the nozzles blows away the melted material of the metal protective layer from the metal sheet.

Claims20

Dependent claims

A method of laser decoating a coated metal sheet, the method comprising:

directing a laser beam onto a surface of a metal sheet coated with a metal protective layer, such that the laser beam strikes the surface of the metal sheet at a laser spot and melts material of the metal protective layer;
and
directing multiple gas flows, from a plurality of nozzles at a pressure of at least 3 bar and at an acute angle with respect to the laser beam onto the laser spot, the nozzles being arranged around the laser beam such that the gas flows directed from the nozzles intersect with each other on the surface of the workpiece at the laser spot and blow away the melted material of the metal protective layer from the metal sheet.

Dependencies are inferred from the claim text.

Laser decoating of coated metal sheets

Life of this patent

Laser decoating of coated metal sheets

Life of this patent

Abstract

Claims20