PROCESS FOR FORMING A CONTAINER BY SELECTIVE LASER HEATING AND FREE BLOWING

摘要

The invention relates to a process for manufacturing a container (14) from a thermoplastic preform (2) carrying a body (4) that extends along a main axis (A), which process comprises: - a selective heating step in which the body (4) of the preform (2) is exposed to monochromatic or pseudomonochromatic infrared radiation, the power of which is modulated along the main axis (A) of the body (4) so that the latter has an alternation of hot annular regions (4A, 4C, 4E, 4G, 4I), the temperature of which is very much greater than the glass transition temperature (Tg) of the thermoplastic, and comparatively cooler annular regions (4B, 4D, 4F, 4H), the temperature of which is close to the glass transition temperature (Tg); and - a forming step in which a pressurized fluid is injected into the preform (2) thus heated, this step resulting in free expansion.