DEMOULDING METHOD FOR AN ARTICLE MADE OF TRANSPARENT POLYMER MATERIAL AND USE FOR MAKING A TRANSPARENT POLYMER ARTICLE SUCH AS AN OPHTHALMIC LENS

摘要

The invention concerns a method which consists in: (a) heating the article uniformly in the mould, at a temperature ranging between Tg + 20 °C and Tg + 80 °C, where Tg is the glass transition temperature of the transparent polymer material, without separating the article and the mould parts; and (b) applying an external mechanical force for separating at least one of the mould parts from the article while the latter is at said stripping temperature.