METHOD OF MANUFACTURING A FILM CONTAINING CAVITES WITH DETERMINATION OF STRETCH PROFILES, DENSITY, THICKNESS AND / OR POROSITY OF THE FILM

摘要

METHOD OF MANUFACTURING A FILM CONTAINING CAVITES WITH DETERMINATION OF STRETCH PROFILES, DENSITY, THICKNESS AND / OR POROSITY OF THE FILM Method of manufacturing a film (F1) comprising cavities and formed from 'a polymer in which a cavitating agent is dispersed, said method comprising a step of extruding the polymer in an extrusion die equipped with actuators for adjusting the thickness of the extruded film and a step of stretching (Str1) of the film , as well as the establishment of a mapping function of the film from density profiles of the film before and after the stretching step, of a stretching profile of the stretched film from said mapping function and said transverse profiles of mass per unit area, and a transverse profile characteristic of the film from said stretching profile and a transverse profile of mass concentration of the cavitating agent in the stretched film which makes it possible to take into account the distribution cavities in the film, pro in which said adjustment actuators are controlled as a function of said characteristic transverse profile. Figure to be published: Figure 1C