DISPOSITIVO PER PERFORARE MATERIALE DI RIVESTIMENTO AD INVOLUCRO PER ARTICOLI DI TABACCO A BASTONCINO,PER PRODURRE UNA ZONA DI DESIDERATA PERMEABILITA' ALL'ARIA

摘要

Apparatus for perforating the wrappers of filter cigarettes or a continuous web of wrapping material for filter cigarettes has a continuous-wave laser and one or more rotary disc-shaped shutters extending across the path of propagation of the laser beam toward the wrappers or web of wrapping material. The dimensions of perforations in the wrappers or web of wrapping material can be regulated by changing the position of the shutter or shutters relative to the laser beam and/or relative to each other.