PROCEDE DE MICROPERFORATION DE PELLICULES THERMOPLASTIQUES PAR ULTRASONS

摘要

A process for microperforating thermoplastic films in which said film (5) is put into contact with perforating components and a tool (1) vibrated by an ultrasonic generator (3). The process of the invention makes it possible to modify the gas and water vapour permeability of the thermoplastic films and their complexes mutually or with non-thermoplastic materials.