Procedure to eliminate the abolsamiento and wrinkles of films organic thermoplastic material (Machine-translation by Google Translate, not legally binding)

摘要

Process to eliminate the sagging and wrinkling of films of thermoplastic organic material, characterized in that the films are obtained by extruding the material in tubular form; the tube is inflated by an internal fluid under pressure, to form a bubble or blister and then reducing the tube to a practically crushed state, and furthermore, by understanding to subject the film, before rolling it and while it is subjected to tension in a practically crushed state, to a sufficient heat treatment to produce the contraction of the film in loose or relaxed state. (Machine-translation by Google Translate, not legally binding)