Patent ID: 9463601
Filing Date: 2016-10-11
CPC Classification: B29D,B60Q,E01F,G02B,G09F

Claim Text:
1. A method of forming retroreflective sheeting, comprising: providing a mold having a structured surface including a plurality of cube corner cavities therein; at least partially filling the plurality of cube corner cavities with a radiation curable resin; exposing the radiation curable resin to a first, patterned irradiation from a first irradiation source to provide a first energy density level of irradiation to the radiation curable resin in a first area of the plurality of cube corner cavities, to form a first optically variable mark element; exposing the radiation curable resin to a second, patterned irradiation from a second irradiation source to provide a second energy density level of irradiation different from the first energy density level of irradiation to the radiation curable resin in a second area of the plurality of cube corner cavities, to form a second optically variable mark element; exposing the radiation curable resin to a third irradiation from a third irradiation source to provide a third energy density level of irradiation to at least the radiation curable resin in the first area and an area of the plurality of cube corner cavities contiguous with the first and second areas thereof, wherein the third energy density level is different from the first and second energy density levels, to provide retroreflective sheeting having a structured layer of cube corner elements and optically variable mark elements therein comprising the first and second optically variable mark elements; and separating the retroreflective sheeting from the mold.