Plastic lens manufacturing
The most widely used process consists of casting a thermosetting resin between two polished glass molds, one with the convex surface and one with the concave surface of the lens to be manufactured. A peripheral seal or adhesive tape ensures tightness when the two molds are assembled.
The duration and temperature of the polymerization cycle are carefully determined in line with the type of resin and the weight of the lens to be polymerized.
• Polycarbonate lens manufacturing
Polycarbonate is a thermoplastic. The base material granules are softened by heat and injected into lens-shaped molds.
This technology can be used to manufacture lenses of any geometry, depending on the mold. The lenses are finished or semi-finished for later surfacing on the back using techniques similar to those applied for other materials.