METHOD AND DEVICE FOR DETERMINING WHETHER OR NOT A SINGLE USE MOLD IS ACCEPTABLE

• Main Author: TONN, Thomas
• Format: Patent
• Language: English; French; German
• Published: 01.07.2020
• Subjects: MEASURING; PERFORMING OPERATIONS; PHYSICS; PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCESIN A PLASTIC STATE; TESTING; TESTING STATIC OR DYNAMIC BALANCE OF MACHINES ORSTRUCTURES; TESTING STRUCTURES OR APPARATUS NOT OTHERWISE PROVIDED FOR; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

A method for determining whether or not a single use mold is acceptable, comprises - providing a closed lens mold (1) comprising two lens mold halves, and having a first and a second optical lens molding surface forming a molding cavity (15) and defining a molding cavity thickness therebetween, - providing at least one interferometer (3), each having at least one thickness measurement beam (31), - providing a lens mold holder (2), - positioning the lens mold (1) such that the thickness measurement beam (31) of the interferometer (3) impinges on the lens mold (1) for measurement of the distance between the two molding surfaces surrounding the molding cavity (15), - measuring the thickness profile of the molding cavity (15) with the interferometer (3) on at least three positions of the molding cavity (15) of the lens mold (1), - comparing the measured thickness profile with a predetermined thickness profile to determine whether or not the lens mold (1) is acceptable.