Method of casting a microstructure sheet having an array of pris

Details Method of casting a microstructure sheet having an array of pris Method of casting a microstructure sheet having an array of pris

1994-06-03

1996-04-30

Davis, Robert

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Continuous or indefinite length

264 19, 264 25, 264225, 2491141, B29C 3340, B29C 3356

Patent

active

055122191

ABSTRACT:
A durable reusable polymeric mold for casting a microstructure sheet having an array of prism elements and a method for forming the microstructure sheet are disclosed. A polymeric mold has a facet side and a base side including an array of prism elements upon which an radiation cured sheet can be formed. A protective surface layer can be formed on the facet side of the polymeric mold. The protective surface layer is sufficiently opaque to radiation to protect the polymeric mold from damage when the curable sheet is formed and is sufficiently bonded to the polymeric mold to allow the cured sheet to be removed from the protective surface layer while not substantially removing the protective surface layer from the polymeric mold. The microstructure sheet can be used as a retroreflective structure.

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