Measuring cigarette pressure drop

A - Human Necessities – 24 – C

Patent

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Details

A24C 5/34 (2006.01) A24C 5/14 (2006.01) A24C 5/18 (2006.01)

Patent

CA 2082901

A cigarette making machine is provided with a pressure drop measuring unit (1) located at or close to the garniture of the making machine. The pressure drop of a gas stream of constant volume is introduced into the compacted tobacco rod beneath the format finger (2) on the making machine at a point at which that pressure drop measurement correlates with the bound pressure drop of the finished cigarette. The unbound cigarette pressure drop or draw resistance experienced by the smoker can be calculated using the bound tobacco rod pressure drop obtained by correlation with the measured pressure drop across the rod in an algorithim processed by calculation means. The degree of ventilation of the cigarette may also be utilised in the algorithim calculation. Comparator means allows the unbound cigarette pressure drop to be maintained within pre-set limits by varying cigarette parameters which affect the overall unbound cigarette pressure drop.

Cette invention concerne une machine à cigarettes équipée d'un organe de mesure de la chute pression (1) situé sur l'enveloppe de la machine ou à proximité. La chute de pression d'un flux gazeux de volume constant dirigé dans le boudin de tabac serré est mesurée sous le doigt de formatage (2) à un point où on peut établir une corrélation entre la chute de pression mesurée et la chute de pression d'une cigarette finie placée dans une gaine. La chute de pression d'une cigarette non gainée, soit la résistance au tirage éprouvée par le fumeur, peut être calculée au moyen d'un algorithme à partir de la chute de pression du boudin de tabac obtenue par corrélation avec la chute de pression mesurée à travers le boudin. Le degré de ventilation de la cigarette peut aussi être utilisé dans le calcul algorithmique. Un moyen de comparaison permet de maintenir la chute de pression de cigarette non gainée à l'intérieur de limites pré-établies en modifiant les paramètres qui ont un impact sur sa résistance au tirage.

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