Smoking articles

Abstract

The invention relates to smoking articles ( 10 ) comprising a rod of smokeable material ( 11 ) and a filter ( 12 ) attached to one end of the rod, said filter comprising at least two sections and being wrapped in a porous plug wrap, wherein a first tipping wrapper ( 14 ) overlies the join between the rod of smokeable material and the filter, and at least one additional tipping wrapper ( 15 ) is provided around the filter, spaced from and separate to the first tipping wrapper such that a portion of the porous plug wrap is exposed between the first and at least one additional tipping wrapper, and wherein the tipping wrappers are normally less porous than the plug wrap. However if the tipping wrappers are more porous than the plug wraps, the split tipping will still retain its functionality.

1 . A smoking article, comprising:
 a smokeable material rod;   a filter attached to one end of the smokeable material rod, said filter including at least two sections and a porous plug wrap;   a first tipping wrapper overlying a join between the smokeable material rod and the filter, thereby attaching the filter to the smokeable material rod; and   at least one further tipping wrapper disposed around the filter, spaced from and separate from the first tipping wrapper such that a portion of the porous plug wrap is exposed between the first tipping wrapper and the at least one further tipping wrapper, and wherein the first tipping wrapper and the at least one further tipping wrapper are each less porous than the plug wrap.   
     
     
         2 . The smoking article as claimed in  claim 1 , wherein a gap is formed between the first tipping wrapper and the at least one further tipping wrapper, the gap exposing an area of the filter that is surrounded with a material that is more porous than each of the first tipping wrapper and the at least one further tipping wrapper, such that a section of the filter is surrounded only by the porous plug wrap. 
     
     
         3 . The smoking article as claimed in  claim 1 , wherein at least one filter section comprises a fibrous filter material. 
     
     
         4 . The smoking article as claimed in  claim 1 , wherein at least one filter section comprises a porous adsorbent material. 
     
     
         5 . The smoking article as claimed in  claim 4 , wherein the porous adsorbent material is a porous carbon having an engineered porous structure. 
     
     
         6 . The smoking article as claimed in  claim 4 , wherein the at least one filter section includes from about 20 mg to about 80 mg porous adsorbent material. 
     
     
         7 . The smoking article as claimed in  claim 1 , wherein at least one filter section comprises an ion exchange resin. 
     
     
         8 . The smoking article as claimed in  claim 7 , wherein the ion exchange resin has a surface activated amine. 
     
     
         9 . The smoking article as claimed in  claim 7 , wherein the filter section includes from about 5 mg to about 40 mg ion exchange resin. 
     
     
         10 . The smoking article as claimed in  claim 1 , wherein the at least two sections of the filter include: a mouth end section having a fibrous filter material, a section comprising an ion exchange resin, and a section comprising porous adsorbent material adjacent to the smokeable material rod. 
     
     
         11 . The smoking article as claimed in  claim 1 , wherein the filter has a length from about 30 mm to about 40 mm. 
     
     
         12 . The smoking article as claimed in  claim 1 , wherein the smoking article has a length of about 83 mm and/or a circumference of about 21 mm. 
     
     
         13 . The smoking article as claimed in  claim 1 , wherein a separation between the first tipping wrapper and the at least one further tipping wrapper is about 10 mm. 
     
     
         14 . The smoking article as claimed in  claim 1 , wherein a tipping wrapper and/or a body of the filter define ventilation holes therein. 
     
     
         15 . The smoking article as claimed in  claim 1 , wherein the smokeable material rod includes one or more of:
 (a) a tobacco treated to produce reduced levels of nitrogenous compounds;   (b) a tobacco treated to remove polyphenols and/or peptides; and   (c) a tobacco substitute sheet comprising a non-combustible inorganic filler, a binder and an aerosol generator.   
     
     
         16 . The smoking article as claimed in  claim 15 , wherein the smokeable material rod further comprises lamina tobacco. 
     
     
         17 . The smoking article as claimed in  claim 15 , wherein the smokeable material rod further comprises dry ice expanded tobacco (DIET). 
     
     
         18 . The smoking article as claimed in  claim 1 , wherein the smokeable material rod comprises glycerol. 
     
     
         19 . The smoking article as claimed in  claim 1 , wherein the smokeable material rod comprises at least one flavor. 
     
     
         20 . The smoking article as claimed in  claim 1 , wherein the smokeable material rod comprises a blend treated tobacco, tobacco substitute sheet, DIET, lamina tobacco, glycerol and a top flavour. 
     
     
         21 . The smoking article as claimed in  claim 4 , wherein the porous adsorbent material is a synthetic source-derived porous carbon bead. 
     
     
         22 . The smoking article as claimed in  claim 4 , wherein the porous adsorbent material is a polystyrene-derived porous carbon bead. 
     
     
         23 . The smoking article as claimed in  claim 11 , wherein the filter has a length of about 37 mm.