Cube corner sheeting mold and of making the same
DCFirst Claim
1. 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 lamina comprising:
- two rows of cube corner elements in the working surface, at least one such row comprising a plurality of nonidentical cube corner elements.
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Abstract
Laminae suitable for use in molds for forming retroreflective cube corner elements and methods for making such laminae are disclosed. A representative lamina includes a first row of cube corner elements disposed in a first orientation and a second row of optically opposing cube corner elements disposed. The working surface of a lamina is provided with a plurality of cube corner elements formed by the optical surfaces defined by three groove sets. Opposing first and second groove sets are formed in the working surface of a lamina. The first groove set forms a plurality of structures having first and second optical surfaces disposed in mutually perpendicular planes that intersect along a reference edge. The second groove set forms a corresponding plurality of structures on the opposite side of the lamina. A third groove is formed in the working surface of the lamina along an axis substantially perpendicular to the axes of the grooves of the first and second groove sets. The surfaces of the third groove intersect the surfaces of the plurality of structures in substantially mutually perpendicular planes to define a plurality of cube corner elements. A plurality of such laminae can be assembled to form a mold useful in the manufacture of retroreflective products such as cube corner sheeting.
105 Citations
12 Claims
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1. 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 lamina comprising:
two rows of cube corner elements in the working surface, at least one such row comprising a plurality of nonidentical cube corner elements. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of making a lamina suitable for use in a mold for use in forming retroreflective cube corner articles, the method comprising:
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providing a lamina having opposing first and second major surfaces; and
forming a first, second, and third groove set in the lamina to define two rows of cube corner elements extending therealong;
wherein the forming step is performed with the lamina registered in one position. - View Dependent Claims (9, 10, 11, 12)
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Specification