METHOD OF FORMING A THREE-DIMENSIONAL COLOURED ARTICLE

摘要

A method of forming a three-dimensional article having at least one selectively coloured zone, said method comprising the steps of: (1) subjecting successive layers of a liquid photopolymerisable resin composition containing a colour former, a developer and an infrared absorber, to a programmed beam of electromagnetic radiation of a wavelength outside the infrared region of the spectrum thereby effecting polymerisation of the photopolymerisable resin composition to form successive layers of solid substantially polymerised resin composition and wherein adjacent layers become cohesively integrated as they are formed such that they define the structure of the three-dimensional article, and (2) subjecting the photopolymerisable resin or each layer of the solid substantially polymerised resin composition to a programmed beam of infrared light thereby effecting colour development or colour change in one or more zones in the article.