Smoking article

Abstract

A smoking article comprising a filter section comprising a first region of filtration material for removing particulate matter from a smoke stream, wherein the rod the smoking article is arranged to enhance heat transfer towards the first region of filtration material is disclosed.

1 . A smoking article comprising:
 a filter section comprising a first region of filtration material for removing particulate matter from a smoke stream,   wherein the smoking article is arranged to enhance heat transfer towards the first region of filtration material.   
     
     
         2 . A smoking article according to  claim 1 , further comprising a rod of smokable material wrapped by a wrapper and arranged to form a coal at one end thereof when lit, wherein the wrapper has heat conducting strips attached thereto to enhance heat transfer from the coal towards the first region of filtration material. 
     
     
         3 . A smoking according to  claim 2 , wherein the rod of smokable material comprises at least one channel extending therethrough to enhance heat transfer from the coal towards the first region of filtration material. 
     
     
         4 . A smoking article according to  claim 3 , wherein the at least one channel is a plurality of channels disposed radially about the circumference of the rod of smokable material. 
     
     
         5 . A smoking article according to any preceding claim, further comprising means for cooling the smoke stream downstream of the first region of filtration material. 
     
     
         6 . A smoking article according to  claim 5 , wherein the means for cooling the smoke comprises a cooling chamber. 
     
     
         7 . A smoking article according to  claim 6 , further comprising a region of adsorbent material in or downstream of the cooling chamber. 
     
     
         8 . A smoking article according to any of  claims 5  to  7 , wherein the means for cooling the smoke include perforations in a wrapper circumscribing the filter section. 
     
     
         9 . A smoking article according to any one of  claims 5  to  7 , wherein the means for cooling the smoke includes at least one gap in the wrapper circumscribing the filter section. 
     
     
         10 . A smoking article according to any preceding claim further comprising a diluent. 
     
     
         11 . A smoking article according to  claim 10 , wherein the diluent is adjacently downstream of the first region of filtration material. 
     
     
         12 . A smoking article according to any of  claims 2  to  11 , wherein the rod of smokable material comprises a pelletised composite of tobacco. 
     
     
         13 . A smoking article according to any of  claims 2  to  12 , wherein the rod of smokable material further comprises carbon. 
     
     
         14 . A smoking article according to any preceding claim, wherein the filter section is configured to alter the composition of the smoke stream as the smoking article is smoked. 
     
     
         15 . A smoking article according to  claim 14 , wherein the first region of filtration forms an annulus around a bore which becomes obstructed as the smoking article is smoked. 
     
     
         16 . A smoking article according to any preceding claim, wherein the filter section is arranged to channel the smoke stream onto the first region of filtration material. 
     
     
         17 . A smoking article according to either  claim 15  or  claim 16  further comprising a second region of filtration material downstream of the first region of filtration material, wherein the second region of filtration material has a filtration efficiency lower than the filtration efficiency of the first region of filtration material. 
     
     
         18 . A smoking article according to any preceding claim, wherein the first region of filtration material is wrapped by an insulating material. 
     
     
         19 . A smoking article according to any preceding claim, wherein the first region of filtration material has a retention value greater than 30 percent. 
     
     
         20 . A smoking article according to any preceding claim, wherein the first region of filtration material has a retention value greater than 70 percent. 
     
     
         21 . A smoking article according to any preceding claim, wherein the smoking article is arranged such that the first region of filtration material only removes matter with boiling points of or greater than a predetermined level. 
     
     
         22 . A smoking article according to  claim 21 , wherein the predetermined level is one of about 250° C., 300° C., 350° C., 400° C., 450° C. or 500° C.