Method of making retroreflective elements

Details Method of making retroreflective elements Method of making retroreflective elements

G - Physics

02

B

G02B 5/128 (2006.01) E01F 9/04 (2006.01)

Patent

CA 2303517

A method of making a ceramic retroreflective element having enhanced strength and increased retained reflectivity. The method of the present invention comprises forming retroreflective elements by the following steps: a) providing glass flakes; b) coating said glass flakes with a first barrier layer yielding coated glass flakes; c) providing optical elements; d) optionally coating said optical elements with a second barrier layer; e) blending said optical elements and said coated glass flakes; f) heating said optical elements and said coated glass flakes to spheroidize said flakes while agitating said optical elements and said coated glass flakes; g) further heating said optical elements and said spheroidized glass flakes to partially embed said optical elements in said spheroidized flakes while agitating said optical elements and said spheroidized flakes; and h) cooling said spheroidized flakes having partially embedded optical elements.

L'invention porte sur un procédé de fabrication d'un élément rétroréfléchissant céramique présentant une meilleure résistance et une plus grande réflectivité rémanente. Ce procédé consiste à former des éléments rétroréfléchissants par les étapes suivantes: a) produire des flocons de verre; b) recouvrir ces flocons de verre d'un première couche barrière; c) produire des éléments optiques; d) recouvrir optiquement ces éléments optiques et les flocons de verre recouverts; e) mélanger les éléments optiques et les flocons de verre recouverts; f) chauffer et agiter les éléments optiques et les flocons de verre recouverts pour sphéroïdiser les flocons; g) chauffer et agiter également les éléments optiques et les flocons de verre sphéroïdisés pour encastrer partiellement les éléments optiques dans les flocons sphéroïdisés; et h) refroidir les flocons sphéroïdisés dans lesquels des éléments optiques sont partiellement encastrés.

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