Continuous extrusion-compression molding process for making opti

Details Continuous extrusion-compression molding process for making opti Continuous extrusion-compression molding process for making opti

1998-10-30

2000-03-28

Vargot, Mathieu D.

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

264 22, 264 25, 2642973, 2642976, 425348R, 425411, 425412, 425449, 425808, B29D 1100

Patent

active

06042754&

ABSTRACT:
The present invention relates to making optical articles such as opthalmic lenses by molding and, in particular, to using a continuous extrusion-compression molding method to make plastic lenses whereby a polymer melt is fed from an extruder or melting apparatus to a first die of a plurality of rotating or conveyed sequentially processed compression die sets comprising a first die and a second die. The die sets are positioned on die supports on a rotating turntable or conveying system, the lenses formed by compressing the die sets with pressing means associated with each die support, the lenses separated from the dies and the dies recycled to die loading and the melt feed step of the process and the process repeated until the desired number of lenses or other optical articles such as compact disk substrates are produced.

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