Visual Texture

Abstract

Surface texture imparted to polymer has a long history of use. These include masking surface imperfections, creating special effects, imitating natural materials such as leather, or help hide scuffmarks and fingerprints. Surface texture is usually controlled by the properties of the surface onto which a part is cast, molded, or embossed. Physical texture can be applied to the surface to change its tactile properties. The control of slip is an important parameter in the design of some products. However, most texturing of polymer surfaces seems to be used to control “visual” effects. Texture creates a pattern of light and dark areas that might be characterized as a shadow-scatter mask. Texturing is primarily accomplished by embossing the surface of the polymer. An alternative technique for creating the visual appearance of texture while maintaining a smooth surface has been developed by creating homogeneous patterns in the polymer melt. This technique optically breaks up the surface appearance, creating a visual texture. Most polymer processes including extrusion and injection molding are amenable to this technique. A method of imparting a visual texture appearance throughout a polymer part has been developed. This effect is available in a variety of foreground and background colors, and domain sizes giving the appearance of a through colored texture. Applications include masking defects, hiding dirt,and simulating natural materials such as stone, marble, and leather.