| 摘要 |
<p>The invention relates to a retroreflective sheeting comprising an area of preferred geometry cube corner elements. The sheeting exhibits an average brightness of 0 DEG and 90 DEG orientation according to ASTM D4596-la of at least 375 candelas/lux/m 2 for an entrance angle of -4 DEG and an observation angle of 0.5 DEG . The retroreflective sheeting may further comprise an area of cube corner elements having a viewing surface and a backside, the sheeting exhibiting an average brightness at 0 DEG and 90 DEG . The retroreflective sheeting may further comprise an array of cube corner elements having a viewing surface and a backside, wherein the sheeting exhibits an average brightness at 0 DEG and 90 DEG orientation and -4 DEG entrance angle according to ASTM D4596-la of at least 625 candelas/lux/m 2 for an observation angle of 0.2 DEG , at least 375 candelas/lux/m 2 for an observation angle of 0.5 DEG , and at least 80 candelas/lux/m 2 for an observation angle of 1.0 DEG , and the backside comprises a seal film that maintain an air interface at the backside of the cubes.</p> |
