Patent ID: 6257860
Filing Date: 2001-07-10
Classification: B29D,Y10S

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, the lamina comprising:a first groove set including at least two parallel adjacent V-shaped grooves in the working surface of the lamina defining a first groove surface and a second groove surface that intersect substantially orthogonally to form a first reference edge;a second groove set including at least two parallel adjacent V-shaped grooves in the working surface of the lamina defining a third groove surface and a fourth groove surface that intersect substantially orthogonally to form a second reference edge; anda third groove in the working surface of the lamina defining a fifth groove surface and a sixth groove surface, the fifth groove surface intersecting substantially orthogonally with the first and second groove surfaces to form at least one first cube corner element disposed in a first orientation and the sixth groove surface intersecting substantially orthogonally with the third and fourth groove surfaces to form at least one second cube corner element disposed in a second orientation different than the first orientation;wherein the fifth and sixth groove surface intersect to define a groove vertex that extends along an axis parallel to the first reference plane.