MOLD, PROCESS FOR MANUFACTURING MOLD, AND PROCESS FOR PRODUCING SHEET

摘要

A mold having an alumina with a microscopic concave convex structure, the concave convex structure such that the distance between adjacent concave portions or convex portions is not greater than the wavelength of visible radiation, formed by anodic oxidation on the surface of an aluminum prototype free from rolling traces, wherein the concave or convex depth or height in crystal grain boundary is 300 nm or less.