Essilor International (compagnie Generale D'optique)

Essilor International

Robert Rist

Aref Jallouli

Haifeng Shan

Richard Muisener

Timothy E Herod

Margie Hendrickson

The present invention is drawn to a process of drilling organic glasses, comprising the steps of:

Process of drilling organic glasses using a thermoplastic film protecting against cracking and crazing

A process for producing a curved substrate () covered with a film () comprises a heat treatment of the film performed between a step of preforming said film and a step of assembling the film with the substrate. A maximum temperature of the pre-assembling heat treatment is higher than another maximum temperature of a post-assembling heat treatment (F) which is performed after the assembling step. Then the assembly of the substrate () with the film () is not altered during said post-assembling heat treatment. In particular, no defect and no delamination appear, and no change in the curved shape of the substrate is caused by the post-assembling heat treatment, even if the substrate () has a low glass transition temperature.

Process for producing a curved substrate covered with a film

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St. Petersburg, FL, United States of America

Robert Rist