Firm filter for aerosol-generating article

Abstract

An aerosol-generating article (10) includes an aerosol forming substrate (20) and a filter (30) downstream of the substrate. The filter comprises filter material having filaments that are distributed throughout a transverse cross section of the filter. The filter comprises from about 7.5% by weight to about 11.5% by weight of plasticizer or from about 10.5% by weight to about 15% by weight of plasticizer. The filters may be hard, while maintaining suitable resistance to draw.

1 . An aerosol-generating article comprising:
 an aerosol forming substrate; and   a filter downstream of the aerosol forming substrate, wherein the filter comprises filter material having filaments that are distributed throughout a transverse cross section of the filter, wherein the filter material has a density of 0.11 g/cm 3  or greater, and wherein the filter material comprises from about 11% by weight to about 13% by weight of plasticizer.   
     
     
         2 . The aerosol-generating article according to  claim 1 , wherein the filter material comprises from about 11.5% by weight to about 13% by weight of plasticizer. 
     
     
         3 . The aerosol-generating article to  claim 1 , wherein the plasticizer comprises triacetin. 
     
     
         4 . The aerosol-generating article according to  claim 1 , wherein the filaments comprise cellulose acetate filaments. 
     
     
         5 . The aerosol-generating article according to  claim 1 , wherein the filaments have a linear density of 4 denier per filament or greater. 
     
     
         6 . The aerosol-generating article according to  claim 1 , wherein the filaments have a linear density of 5 denier per filament or greater. 
     
     
         7 . The aerosol-generating article according to  claim 1 , wherein the filter material has a density between about 0.12 g/cm 3  and 0.19 g/cm 3 . 
     
     
         8 . The aerosol-generating article according to  claim 1 , wherein the filter comprises a plug wrap disposed about the filter material. 
     
     
         9 . The aerosol-generating article according to  claim 8 , wherein the filter further comprises a hardness enhancing coating on the plug wrap. 
     
     
         10 . The aerosol-generating article according to  claim 9 , wherein the coating comprises polyvinyl alcohol. 
     
     
         11 . The aerosol-generating article according to  claim 1 , wherein the filter has an average radial harness of 95% or greater, wherein the average radial hardness is measured by applying a load of 2 kg for 20 seconds around the filter of the aerosol generating article and comparing the ratio of the original, uncompressed diameter to the diameter after the load is applied. 
     
     
         12 . The aerosol-generating article according to  claim 1 , wherein the filter has a resistance to draw of 90 mmWG or less. 
     
     
         13 . The aerosol-generating article according to  claim 1 , wherein the filter has a resistance to draw of 70 mmWG or less 
     
     
         14 . The aerosol-generating article according to  claim 1 , wherein the aerosol-generating substrate comprises tobacco. 
     
     
         15 . (canceled)