FIELD: physics.
SUBSTANCE: coating comprises a retroreflective film having a flat surface on the front side and a plurality of retroreflective elements on the reverse side and an ink layer deposited on said flat surface in a halftone pattern that includes a pattern of light-transmissive lumens between discrete regions of deposited ink that receive Incident light and let the returned light pass without obstruction on the side of mentioned ink. Light-transmitting gaps and discrete regions of the deposited ink determine the front outer surface of the retro-reflective sheet coating.
EFFECT: use of such a halftone ink pattern increases the reflectivity of the printed retroreflective sheeting by reducing the amount of light absorbed by the ink and reducing the amount of light scattered by the ink layer, and also eliminates the need for a transparent topcoat or film on the front surface of the retroreflective sheet.
21 cl, 20 dwg
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