Process of dosing a starting material for optical lenses

• Main Authors: HEINRICH AXEL, STEFFAN WERNER, HAGMANN PETER, LEDER-BRUCK IRIS, SEIFERLING BERNHARD
• Format: Patent
• Language: English
• Published: 23.03.2010
• Subjects: PERFORMING OPERATIONS; PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCESIN A PLASTIC STATE; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

A process of dosing a starting material (SM) for optical lenses, into a female mold half (2), comprises the steps of: positioning a dosing tip (1) at a start position (P2) above the female mold half (2) and close to the edge of or laterally outside that portion (20) defining the lens-shaping surface, creating a continuous flow of starting material (SM) through the dosing tip (1) into the female mold half (2), moving the dosing tip (1) from the start position (P2) towards an end position (P3) in the region of the center of the female mold half (2) once the starting material (SM) has contacted the surface (21) of the female mold half (2) with the dosing tip (1) being in the start position (P2), wherein the continuous flow of starting material (SM) through the dosing tip (1) and the movement of the dosing tip (1) from the start position (P2) to its end position (P3) are controlled such, that a continuous bead (B) of starting material (SM) is deposited on the surface (21) of the female mold half (2) and that the essential part of the overall volume of starting material (SM) dosed into the female mold half (2) is deposited within the female mold half (2) with the dosing tip (1) being in the end position (P3).