Process for manufacture of Fresnel lenses

US5656209A · kind A · utility

Assignee

• Roehm GmbH Chemische Fabrik · DE

Inventors

• Volker Benz · Kelsterbach, DE
• Martin Berkenkopf · Pfungstadt, DE
• Udo Fischer · Sundbyberg, SE
• Hans Lorenz · Darmstadt, DE
• Michael Meier-Kaiser · Pfungstadt, DE

Key dates

• Filing date: Dec 27, 1994
• Grant date: Aug 12, 1997
• Expiry date: Dec 27, 2014

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02E10/40
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

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.