Method of making aluminium rolled product having at least one bright surface

Abstract

The invention concerns a method for cold rolling bright aluminium rolled products and comprises: (a) Providing a first aluminium alloy rolled product (b) Rolling said first product with a rolling mill (1) having at least one work roll ground to a finish (11), with a roughness Ra less than 1 μm, and using a rolling lubricant (51) from a first container (2) comprising less than 150 mg/L of aluminium debris to obtain a second aluminium rolled product having at least one bright surface, (c) Transferring at least a portion of said rolling lubricant to a second container (3) (d) Filtering the lubricant from said second container (52) by using cross flow filtration (4) through a membrane (41), to obtain a cleaned rolling lubricant (54) comprising less than 10 mg/L and preferably less than 5 mg/L of aluminium debris preferentially having a mean diameter of less than 2 μm, (e) Returning said cleaned rolling lubricant (54) to the first container.

Dependencies are inferred from the claim text.