| 摘要 |
The present invention relates to a three dimensional article having a high intensity retroreflective outer surface, comprising:
a base layer (3) of thermoformable plastic sheet material;
a layer of retroreflective microbeads (6) having variable diameters adhered to an outer surface of the base material (3), and
a protective sheet of transparent thermoformable sheet material (15) having a lower surface (19) overlying the layer of microbeads (7) the protective sheet (15) and the retroreflective microbeads (7) contact only at a tangential point (20) contact between the lower surface (19) of the protective sheet (15) and tops of the highest microbeads (7) after cooling of the protective sheet (15) resulting in a plurality of air spaces (21a, 21b, 21c),
wherein the base layer (3), layer of microbeads (7), and protective transparent sheet (15) are formed into a self supporting three dimensional article having a pre-selected shape and an encapsulated bead retroreflective surface. |
