PROCESS FOR PRODUCING ALUMINUM MATERIAL FOR ELECTROLYTIC CAPACITOR ELECTRODE, ALUMINUM MATERIAL FOR ELECTROLYTIC CAPACITOR ELECTRODE AND ELECTROLYTIC CAPACITOR

WIPO Patent Application WO/2004/003248

A1

Aluminum ingot is sequentially subjected to hot rolling and cold rolling, intermediate annealing and final annealing wherein in the period after intermediate annealing but before initiation of final annealing, at least one tensile strain application is carried out without the application of cold rolling. The tensile strain application is carried out by means of tensile strain applicator (1) comprising two or more bridle roll units (10,11) disposed in the direction of conveyance of aluminum material (S) and capable of providing tension region (Q) between adjacent bridle roll units (10,11) in such a manner that between peripheral speed Pi of upstream bridle roll unit (10) and peripheral speed Po of downstream bridle roll unit (11), there is provided such a peripheral speed difference as Pi