Filter for a smoking article

Abstract

A filter for a smoking article has a first filter section comprising a filter material and a smoke modifying additive disposed in an axial region thereof and a second filter section connected to the first filter section and having at least one channel located in an axial region thereof for directing smoke, in use, through the axial region of the first filter section. The smoke modifying additive can comprise a flavourant such as menthol and the second filter section can comprise a tubular section of fibrous filter material. An adsorbent filter section can also be provided.

1 - 38 . (canceled) 
     
     
         39 . A smoking article in the form of a heat-not-burn product capable of generating an aerosol for delivery to a consumer, the heat-not-burn product comprising a filter, the filter comprising:
 a first discrete filter section comprising continuous filter material having an aerosol modifying additive disposed in an axial region of said filter material, wherein the aerosol modifying additive is disposed only in said axial region of the first filter section or in a greater concentration in said axial region than in non-axial regions of the first filter section, and wherein the aerosol modifying additive is contained within a frangible capsule; and   a second discrete filter section connected to said first filter section, the second filter section comprising at least one channel located in an axial region thereof, for directing aerosol, in use, through the axial region of the first filter section in which the frangible capsule is disposed, wherein the second filter section is connected to said first filter section so as to make the second filter section upstream of said first filter section when incorporated into a smoking article, and wherein the second filter section comprises a tubular filter section comprising a wall thickness of from 1 mm to 3 mm and wherein the channel comprises a hollow passageway through the second filter section having a diameter of from 2 mm to 5 mm.   
     
     
         40 . A smoking article according to  claim 39 , wherein the tubular filter section is formed from a fibrous filter material. 
     
     
         41 . A smoking article according to  claim 40 , wherein the tubular filter section is formed from cellulose acetate tow. 
     
     
         42 . A smoking article according to  claim 39 , wherein the at least one channel has a lower resistance to aerosol passing through it than other regions of the second filter section. 
     
     
         43 . A smoking article according to  claim 39 , wherein said axial region of at least one of said first filter section and said second filter section has a radius of from 1 mm to 3 mm and is centred on the axis of the smoking article. 
     
     
         44 . A smoking article according to  claim 43 , wherein said axial region of at least one of said first filter section and said filter section has a radius of about 2.5 mm. 
     
     
         45 . A smoking article according to  claim 39 , wherein the first filter section is wrapped in a first plug wrap and the second filter section is wrapped in a second plug wrap. 
     
     
         46 . A smoking article according to any  claim 39 , wherein the aerosol modifying additive comprises menthol. 
     
     
         47 . A smoking article according to  claim 39 , wherein the capsule has a diameter of about 3.5 mm. 
     
     
         48 . A smoking article according to  claim 39 , wherein the capsule is located within the first filter section at a position other than a longitudinally central position within the first filter section. 
     
     
         49 . A smoking article according to  claim 48 , wherein the capsule is located within the first filter section at a position from 1 mm to 10 mm from a longitudinally central position within the first filter section. 
     
     
         50 . A smoking article according to  claim 39 , further comprising a third discrete filter section connected to said second filter section so as to make the third filter section upstream of said second filter section when incorporated into a smoking article. 
     
     
         51 . A smoking article according to  claim 50 , wherein the third filter section comprises fibrous filter material and a granular adsorbent material. 
     
     
         52 . A smoking article according to  claim 51 , wherein the granular adsorbent material is disposed in a circumferential region of the third filter section, dispersed within the filter material of the third filter section, or comprises some granular adsorbent material disposed in a circumferential region of the third filter section and some granular adsorbent material dispersed within the third filter section.