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US 5,998,044 AGranted
Aluminium sheet with rough surface
AssigneeAlcan International Limited
InventorsPeter Karl Ferdinand Limbach, Martin Philip Amor, Jonathan Ball
Life of this patent
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Abstract
Aluminium sheet suitable for use as a lithographic plate support has a surface that is uniformly rough by virtue of a rippled topography having an aspect ratio of at least 1.3 on a ale of 5-200 .mu.m and a superimposed pitted surface on a scale of 1-20 .mu.m.
Claims4
Rolled aluminium sheet having a surface that is uniformly rough by virtue of:
- a rippled topography comprising ridges and troughs extending transverse to a rolling direction and having an aspect ratio of at least 1.5 and an average spacing between adjacent ridges of 5-200 .mu.m;
- and a pitted structure comprising pits having an average diameter of 1-20 .mu.m and an aspect ratio of not more than 1.5.
Dependencies are inferred from the claim text.