The Correlation Between Cigarette Pressure Drop and Moisture Content - Die Abhängigkeit des Zugwiderstandes von der Feuchtigkeit bei Cigaretten

Empirical experimental measurements show the relationship existing between pressure drop R and humidity F (referring to dry weight) of the cigarette to be as follows:

with R1 (F1) and R2 (F2). In introducing this relation into the formula formerly given for calculating cigarette draw resistance, we find:

The constant K of the measurements described was found to be between K=1.7 and K = 1.8. RG expresses the resistance to air flow of the burning cone, b denotes the specific resistance to air flow of the tobacco rod, a is the specific conductivity to air f¬low of the paper, l expresses the length of the porous paper wrapping of the cigarette, and R0 is the resistance to air flow of the dry cigarette. It turns out that cigarette draw resistance depends on cigarette humidity to such an extent that, in principle, pressure drop measurements should always be given in reference to the moisture content of the cigarette. In the experiments described by the present paper the following relation was found to be valid approximately: