Abstract: A method of making rollers with a fine pattern has the acts of casting a ceramic layer onto a roller surface, grinding and polishing the roller surface, forming a pattern on the roller surface with laser, and cleaning the roller surface. Therefore, the roller thus made has a pattern with higher precision than the conventional method of mold casting. Since the roller surface has a ceramic layer that has better resistance to erosion than steel, the roller has a longer lifetime.

Abstract: A transfer roller with a honeycomb-like pattern has a metal roller and a ceramic layer coated on a surface of the metal roller. The ceramic layer is formed with a plurality of hexagonal pattern units. The pattern units are closely configured so that each side of each pattern unit is adjacent to a corresponding side of another pattern unit. A shaft goes through an axis of the roller and protrudes from both ends of the axis. Since the roller has a ceramic layer with better erosion resistance than steel, the transfer roller has a longer lifetime. As the pattern units are hexagonal, a flat and uniform alignment film is achieved when the transfer roller is used to make liquid crystal displays.

Abstract: A cleaning assembly for a surface of a roller has a dry-ice container, a connector and an injector. The dry-ice container contains CO2. The connector has two ends and one end connects the dry-ice container. The injector is mounted on the other end of the connector, is coupled with the connector and the dry-ice container and allows CO2 to be sprayed out of the injector toward the surface of the roller. Because CO2 is solid when it is sprayed out of the injector toward the surface of the roller, the solid CO2 provides enough kinetic energy to residues in cells of the roller. Therefore, the residues can be removed from the cells. Additionally, after the solid CO2 impacts the surface of the roller, the solid CO2 sublimates directly to a gas CO2, so there is no stain or other spot to be remained on the surface of the roller.