Patent ID: 6120881
Filing Date: 2000-09-19
Classification: B29D,B32B,G02B,Y10T

Abstract:
A lamina suitable for use in a mold for use in forming retroreflective cube corner articles, the lamina having opposing first and second major surfaces defining therebetween a first reference plane, the lamina further including a working surface connecting the first and second major surfaces, the working surface defining a second reference plane substantially parallel to the working surface and perpendicular to the first reference plane and a third reference plane perpendicular to the first reference plane and the second reference plane, comprising:a first groove set including one V-shaped groove in the working surface of the lamina, the groove defining a first groove surface and a second groove surface that intersect to define a first groove vertex;a second groove set including one V-shaped groove in the working surface of the lamina, the groove defining a third groove surface and a fourth groove surface that intersect to define a second groove vertex, the third groove surface intersecting the first groove surface substantially orthogonally to define a first reference edge; anda third groove set including two parallel V-shaped grooves in the working surface of the lamina, each such groove defining a fifth groove surface and a sixth groove surface that intersect to define a third groove vertex that extends deeper into the working surface than the first and second groove vertices, the fifth groove surface of one of the two parallel grooves intersecting substantially orthogonally with the first and third groove surfaces to form a first cube corner disposed in a first orientation.