Perforating rod-shaped articles of tobacco-processing industry, especially dual filter cigarettes, involves determining if desired opening to be introduced by assessing detected radiation from article

摘要

The method involves directing an laser beam (38) at the article (63) via deflection optics (40,42,44,52,50,54) to introduce a desired opening. Radiation (70,71) emanating from the article is detected via the deflection optics so that it can be determined whether the desired opening is to be introduced by comparing a property of the detected radiation with a desired value. AN Independent claim is also included for the following: (a) an arrangement for producing at least one zone of defined air transmissivity in an envelope material for rod-shaped tobacco articles.