Recessed ventilation for smoking articles

A - Human Necessities – 24 – D

Patent

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Details

A24D 3/04 (2006.01)

Patent

CA 2705718

A smoking article (10) comprises a tobacco rod (15), a filter unit (16) having a substantially circumferential ventilation zone (24), and a tipping paper (22) joining the tobacco rod and the filter unit, at least one side of the ventilation zone being bounded by a substantially circumferential element (28) having a greater outer diameter than the outer diameter of the ventilation zone. Protection is gained against inadvertent or deliberate blocking of the ventilation zone by defining a recess for the ventilation zone. Using a range of materials with controlled porosity and diffusion attributes within the recess enables lower smoke yields under high puff volumes (flows) to be achieved as well as a decrease in the level of selected smoke components such as carbon monoxide.

Selon l'invention, un article à fumer (10) comprend une tige de tabac (15), une unité de filtre (16) comportant une zone de ventilation sensiblement circonférentielle (24), et un papier manchette (22) reliant la tige de tabac et l'unité de filtre, au moins un côté de la zone de ventilation étant délimité par un élément sensiblement circonférentiel (22) ayant un diamètre extérieur supérieur au diamètre extérieur de la zone de ventilation. Une protection est obtenue contre un blocage par inadvertance ou délibéré de la zone de ventilation par la définition d'une cavité pour la zone de ventilation. L'utilisation d'une gamme de matériaux avec des qualités contrôlées de porosité et de diffusion à l'intérieur de la cavité permet d'obtenir de moindres rendements de fumée avec des volumes (écoulements) de bouffée élevée, ainsi qu'une diminution du taux de composants de fumée sélectionnés, tels que le monoxyde de carbone.

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