Retro-reflecting sheet material and method of making same

Details Retro-reflecting sheet material and method of making same Retro-reflecting sheet material and method of making same

1979-09-13

1981-05-05

Hoffman, James R.

Coating processes

Optical element produced

Polarizer, windshield, optical fiber, projection screen, or...

350105, G02B 5128, B05D 506, B05D 714

Patent

active

042659388

ABSTRACT:
The specification relates to retro-reflectors of the type used for road signs and markers and vehicle license plates to make these objects more noticeable to road users after dark. In the invention, the surface of a metal substrate is made retro-reflective by applying a layer of an organic polymeric material and adhering glass beads thereto, and then passing the substrate through a roller mill or the like with the glass beads covered by a platen so that the beads form indentations in the metal surface. The presence of the platen allows the pressing (indentation) step to take place without damage to the glass beads or to the layer between the beads and the metal surface. By this means, a hard metal article can be made directly retro-reflective.

REFERENCES:
patent: 2407680 (1946-09-01), Palmquist et al.
patent: 2543800 (1951-03-01), Palmquist et al.
patent: 3922433 (1975-11-01), Patterson et al.

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