Patent ID: 7439722

Claim:
A method for analyzing filling density of a cigarette with tobacco, said cigarette having a stem provided with a cut performed during manufacturing of said cigarette, a strengthened tip ,a filter, and parameters comprising at least a length of tobacco, a section L of the cigarette, a total length of the cigarette LT, a length of said filter LF, said method comprising the steps of: determining a filling profile of said cigarette; and calculating from said profile and from experimental measurements the position of said strengthened tip relatively to said cut and of the strength of said strengthened tip, said method comprising the following operating phases: elaborating a sinusoidal mathematical model representing said density y along the longitudinal axis of said cigarette, this model taking said parameters into account and at least two constants A 0 , A 1 and a phase φ which are determined experimentally, achieving experimental measurements so as to determine an average density D of the tobacco and an average moisture H of said tobacco at a plurality of points along the longitudinal axis of the cigarette, calculating a regression determination coefficient R 2 from the measured values, calculating a position P of the strengthened tip from the phase φ and the aforesaid parameters, calculating a shift of the strengthened tip relatively to the cut from the position P calculated earlier, calculating a strengthening index from the value of said constants.