Spherical beads for light retro-reflective applications and method of preparing such beads

摘要

The invention relates to a new retro-reflecting sheet material comprising a substrate having a retro-reflective surface, where said retro-reflective surface comprises several layers including a mono layer of spherical beads and possibly one or more transparent layers. Further, the invention relates to a new method of preparing said retro-reflective surface on a substrate comprising providing said layers on the substrate. The layers constituting the retro-reflecting sheet material are applied one by one to the substrate substantially by rollers, and preferably by means of coil coating.