Process for manufacture of Fresnel lenses

Details Process for manufacture of Fresnel lenses Process for manufacture of Fresnel lenses

1994-12-27

1997-08-12

Vargot, Mathieu D.

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Continuous or indefinite length

264 17, 264 19, 264284, 2642102, 26417316, B29D 1100

Patent

active

056562098

ABSTRACT:
A process for the extrusion of plastic plates with very finely structured surface using an extrusion system which is equipped with an extruder and a three roll polishing stack containing a roller with the structuring surface. The system is designed for coextrusion and the plastic plates are produced via two extruders as a coextrudate CX from a highly viscous basic molding compound BF and a low viscosity molding compound NF which is extruded on BF. The surface of said plates is structured via the three roll polishing stack. Fresnel lenses produced by the process may be used in solar collectors.

REFERENCES:
patent: 3810804 (1974-05-01), Rowland
patent: 4149817 (1979-04-01), Miller et al.
patent: 4921669 (1990-05-01), Vetter et al.
patent: 5183597 (1993-02-01), Lu

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