Patent ID: 8881402

Claim:
A method for making an roller, comprising: providing a substrate; forming an aluminum film on a surface of the substrate; anodizing the aluminum film to form a plurality of first microstructures by immersing the substrate with the aluminum film in an electrolytic oxidation solution and applying a voltage to the electrolytic oxidation solution; enlarging the first microstructures to form a plurality of cone-shaped second microstructures by dipping the substrate which has been anodized in a phosphoric acid solution and applying a voltage to the phosphoric acid solution; transferring the cone-shaped second microstructures on a surface of a metal molding plate; molding a micro-structured layer using the metal molding plate, the metal molding plate printing a plurality of third microstructures corresponding to the cone-shaped second microstructures; and attaching the micro-structured layer on a circumferential surface of a cylindrical main body, with the third microstructures of the micro-structured layer protruding away from the main body.