| 摘要 |
<p>The retroreflective device 1, primarily for use road markings, road coatings etc, comprises an agglomeration of glass beads 2, with the beads preferably being chosen due to their size and refractive index in accordance with the desired reflectivity of the finished device. The glass beads may be bound together by an adhesive material 3, such as epoxy resin, acrylic, polyurethane or a hot metal adhesive, which may be pigmented so as to colour the light reflected from the device. The agglomeration of glass beads may be approximately spherical or ovoid. Also claimed is a method of manufacturing the devices which comprises the steps of forming a bed of glass beads of a selected size and then introducing droplets of a binder material into the bed so that groups of beads bind together.</p> |
