Patent ID: 8869875
Filing Date: 2014-10-28
Classification: C22B,C22C

Abstract:
1. A method for producing an aluminium alloy for lithographic print plate carriers in which during production of the aluminium alloy after electrolysis of aluminium oxide, liquid aluminium, up to casting of the aluminium alloy, is supplied to a plurality of purification steps and proportion of aluminium carbides in the aluminium alloy is lowered by one or more purification steps to less than 10 ppm, comprising at least the following purification steps: supplying the liquid aluminium to a stirring station after the electrolysis of the aluminium oxide, introducing inert gases into the liquid aluminium whilst stirring, wherein the duration of the stirring and blowing in of the inert gas into the liquid aluminium in the stirring station is at least 10 minutes, filtering the aluminium alloy prior to continuous or strip casting, by using a filter having a filter efficiency for particles with a size of less than or equal to 5 μm.