An Aerosol Generating Article Comprising Impregnated Charcoal Paper Filter and a Flavoring Capsule

Abstract

A filter for an aerosol generating article extends along a filter axis (F) between an upstream end and a mouth end. The upstream end is configured to be in fluid communication with a downstream end of an aerosol generating substrate. The filter includes an upstream end filter portion delimiting the upstream end and including impregnated charcoal paper or nonwoven substrate, and a mouth end filter portion delimiting the mouth end. The filter further includes at least one flavouring capsule.

1 . A filter for an aerosol generating article, the filter extending along a filter axis (F) between an upstream end and a mouth end, the upstream end configured to be in fluid communication with a downstream end of an aerosol generating substrate;
 the filter comprising:
 an upstream end filter portion delimiting the upstream end and comprising impregnated charcoal paper or nonwoven substrate; 
 a mouth end filter portion delimiting the mouth end; and 
 at least one flavouring capsule 
   and wherein the mouth end filter portion comprises filter paper or nonwoven substrate.   
     
     
         2 . The filter according to  claim 1 , wherein the impregnated charcoal paper is a gathered sheet of paper. 
     
     
         3 . The filter according to  claim 1 , wherein the upstream end filter portion has a pressure drop per unit length:
 between 4 and 10 mmWG/mm, if the upstream end filter portion contains the flavouring capsule; and   between 0.01 to 2 mmWG/mm if the flavouring capsule is not contained in the upstream end filter portion,   wherein the pressure drop is determined by the ISO 6565:2015 standard.   
     
     
         4 . The filter according to  claim 1 , wherein the density of the filter paper in the mouth end filter portion is between 0.1 mg/mm 3  and 0.3 mg/mm 3 . 
     
     
         5 . The filter according to  claim 1 , wherein a density of the impregnated charcoal paper in the upstream end filter portion is between 0.120 mg/mm 3  and 0.220 mg/mm 3 . 
     
     
         6 . The filter according to  claim 1 , further comprising a cavity middle portion extending between the upstream end filter portion and the mouth end filter portion and wherein the flavouring capsule is located in the cavity middle portion. 
     
     
         7 . The filter according to  claim 6 , wherein a diameter of the flavouring capsule is at least 0.4 time, a diameter of the cavity. 
     
     
         8 . The filter according to  claim 1 , wherein the flavouring capsule is located in the mouth end filter portion. 
     
     
         9 . The filter according to  claim 1 , wherein the flavouring capsule is located in the upstream end filter portion. 
     
     
         10 . The filter according to  claim 8 , wherein a diameter of the flavouring capsule is at least 0.4 time a diameter of the filter portion. 
     
     
         11 . The filter according to  claim 9 , further comprising a second flavouring capsule located in the mouth end filter portion. 
     
     
         12 . The filter according to  claim 9 , wherein the upstream end filter portion comprises an upstream end filter wrapper having a basis weight above 25 gsm. 
     
     
         13 . The filter according to  claim 1 , wherein the upstream end filter portion comprises an upstream end filter wrapper having a basis weight above 45 gsm. 
     
     
         14 . The filter according to  claim 1 , wherein the upstream end filter portion and the mouth end filter portion are wrapped by a common filter wrapper. 
     
     
         15 . The filter according to  claim 1 , wherein the flavoring capsule of the invention has a diameter preferably comprised between 2.5 and 4.5 mm and comprises a shell containing a flavoring agent releasable while vaping. 
     
     
         16 . An aerosol generating article comprising:
 an aerosol generating substrate delimiting a downstream end; and   a filter according to  claim 1 .   
     
     
         17 . The aerosol generating article according to  claim 16 , further comprising a cooling or distancing element interposed between the aerosol generating substrate and the filter. 
     
     
         18 . The filter according to  claim 2 , wherein the gathered sheet of paper defines a linear density of charcoal between 0.05 and 0.5 mg/12 mm.