Apparatus for perforating and testing the permeability of running webs of cigarette paper or the like

Apparatus for treating a running web of cigarette paper, tipping paper or the like, comprising means for advancing the web in a predetermined direction along a predetermined path;

• adjustable means for perforating the running web in a first portion of said path;
• first monitoring means for ascertaining the permeability of the perforated web in a second portion of said path, comprising means for generating first signals when the permeability of successive increments of the running web in said second portion of said path deviates from a preselected permeability;
• means for adjusting said perforating means in response to said first signals;
• second monitoring means for ascertaining the permeability of the perforated web in a third portion of said path, comprising means for generating second signals denoting the ascertained permeability of successive increments of the running web in said third portion of said path;
• a source of third signals denoting a predetermined permeability;
• and means for comparing said second signals with said third signals, including means for generating fourth signals when said second signals deviate from said third signals.