Rolled surfaces having a dulled gloss finish

Abstract

This application discloses cold rolled surfaces having a dulled gloss finish. The finish has a fairly uniform glossiness with a slightly matted appearance and with minimal directionality. The surfaces are prepared from work rolls having an Ra value of from 0.2 to 0.4 μm and an Rz value of less than 3.0 μm. Methods of preparing the surfaces are also described herein.

1 . A work roll, comprising:
 a surface having an Ra value of from 0.2 to 0.4 μm and an Rz value of less than 3.0 μm.   
     
     
         2 . The work roll of  claim 1 , wherein the surface has an Ra value of from 0.27 μm to 0.3 μm and an Rz value of less than 2.5 μm. 
     
     
         3 . The work roll of  claim 1 , wherein the work roll is a cold mill work roll. 
     
     
         4 . A method of preparing a work roll for applying a dulled gloss finish on a metal substrate surface, comprising:
 (a) roughening an unfinished work roll surface to form a roughened work roll surface, wherein the roughened work roll has an Ra of 0.20 μm or less and an Rz of 2.00 μm or less;   (b) polishing the roughened work roll surface to form a polished work roll surface having an Ra of less than 0.015 μm and an Rz of less than 0.25 μm;   (c) uniformly roughening the polished work roll surface to form a uniformly roughened work roll surface having an Ra of from 0.35 μm to 0.45 μm and an Rz of less than 5 μm; and   (d) finishing the uniformly roughened work roll surface to form a work roll surface, wherein the work roll surface has an Ra value of from 0.2 to 0.4 μm and an Rz value of less than 3.0 μm.   
     
     
         5 . A work roll prepared according to the method of  claim 4 . 
     
     
         6 . A method of forming a dulled gloss finish on a metal substrate, comprising:
 (a) roughening an unfinished work roll surface to form a roughened work roll surface, wherein the roughened work roll has an Ra of 0.20 μm or less and an Rz of 2.00 μm or less;   (b) polishing the roughened work roll surface to form a polished work roll surface having an Ra of less than 0.015 μm and an Rz of less than 0.25 μm;   (c) uniformly roughening the polished work roll surface to form a uniformly roughened work roll surface having an Ra of from 0.35 μm to 0.45 μm and an Rz of less than 5 μm;   (d) finishing the uniformly roughened work roll surface to form a work roll surface, wherein the work roll surface has an Ra value of from 0.2 to 0.4 μm and an Rz value of less than 3.0 μm;   (e) inserting the work roll in a cold mill; and   (f) cold rolling the metal substrate with the work roll to achieve the dulled gloss finish on the metal substrate.   
     
     
         7 . The method of  claim 6 , wherein the metal substrate is aluminum or an aluminum alloy sheet. 
     
     
         8 . A product formed according to the method of  claim 6 . 
     
     
         9 . The product of  claim 8 , wherein the product is a can end. 
     
     
         10 . The product of  claim 8 , wherein the product is a surface of an electronic product. 
     
     
         11 . The product of  claim 8 , wherein the product is a surface for lithographic use.