Method of increasing retroreflective brightness in a...

Details Method of increasing retroreflective brightness in a... Method of increasing retroreflective brightness in a...

G - Physics

02

B

G02B 5/124 (2006.01)

Patent

CA 2163853

A method of increasing retroreflective brightness in a retroreflective sheet material. The retroreflective sheet material has a multitude of prism-like reflective elements imbedded in a transparent polymer plastic top film and glued by a grid of adhesive to a backing sheet. The method includes the step of heating the retroflective sheet material until bubbles form in the transparent polymer plastic top film containing the prism-like reflective elements. The bubbles are confined by the grid. The bubbles serve as miniature magnifying lenses which increase retroreflective brightness and increase the exposure area thereby providing a wider observation angle.

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