Plastic and nonmetallic article shaping or treating: processes – Optical article shaping or treating – Utilizing plasma – electric – electromagnetic – particulate – or...
Patent
1978-10-23
1981-01-06
Lowe, James B.
Plastic and nonmetallic article shaping or treating: processes
Optical article shaping or treating
Utilizing plasma, electric, electromagnetic, particulate, or...
29411, 29425, 29445, 76107R, 264220, 264225, B29D 1100, B29C 102
Patent
active
042436184
ABSTRACT:
A method is disclosed for forming a retroreflective sheeting having a plurality of retroreflective cube-corner prisms distributed over one of its surfaces such that the prisms are disposed in a planar array having a plurality of zones of prisms having differing angular orientations such that the zones have differing retroreflective brightness when illuminated by a light beam at a high angle of incidence. The method comprises clamping a plurality of pins together such that the ends of the pins form a substantially planar surface, inscribing the planar surface for forming thereon a continuous pattern of solid trigonal pyramids with internal dihedral angles of 90 degrees, releasing the bundle of pins and rotating the individual pins for changing the angular orientation of the formed trigonal pyramids on adjacent pins, reclamping the pins together and using the inscribed surface of the bundle of pins for forming a mold containing cube-corner prism cavities, and producing prismatic retroreflective sheeting by embossing, molding or casting in such mold.
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Avery International Corporation
Lowe James B.
LandOfFree
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