| abstract |
The invention relates to a combined filter for removing tars and toxic compounds from tobacco smoke, which is applied to any type of tobacco rod, comprising a primary membrane (M1) located at the end of the tobacco rod, made up of at least one disc of impervious material and perforated with at least one hole that extends through same in a direction perpendicular to the cross-section of the membrane, so that the perforated surface has a free flow area of 0.2 % to 30 % of the total cross-section of the membrane; an outer membrane (M3) located at the end in contact with the smoker and made up of a cellulose-acetate fibre; which can include a cylindrical intermediate membrane (M2) formed by an adsorbent material between the primary membrane (M1) and the outer membrane (M3). |