Smoking article filter

Abstract

A filter or filter element comprising a longitudinally extending (e.g. cylindrical) rod of filtering material including a longitudinally extending channel which extends along the full length of the filter or filter element.

1 . A filter comprising a longitudinally extending rod of filtering material including at least one longitudinally extending channel which extends along the full length of the filter. 
     
     
         2 . A filter comprising a longitudinally extending tubular rod of filtering material, the inner surface of the tubular rod of filtering material defining at least one channel which extends along the full length of the filter. 
     
     
         3 . The filter according to  claim 1 , wherein the channel has a uniform cross-section along the full length of the filter. 
     
     
         4 . The filter according to  claim 1 , wherein the channel which extends the full length of the filter is helical or substantially helical. 
     
     
         5 . The filter according to  claim 1 , wherein the channel which extends the full length of the filter is semi-cylindrical. 
     
     
         6 . The filter according to  claim 1 , wherein the filtering material comprises cellulose acetate filamentary tow. 
     
     
         7 . The filter according to  claim 1 , wherein the filtering material comprises a plasticizer, for example triacetin, triethyleneglycol diacetate (TEGDA), or polyethylene glycol (PEG). 
     
     
         8 . The filter according to  claim 1 , wherein the filtering material comprises a pigment and/or a flavourant. 
     
     
         9 . The filter according to  claim 8 , wherein the flavourant is provided within a flavour capsule. 
     
     
         10 . The filter according to  claim 9 , wherein the channel which extends along the full length of the filter is semi-cylindrical and the flavour capsule is provided in the rod of filtering material adjacent the semi-cylindrical channel. 
     
     
         11 . The filter according to  claim 8 , wherein the flavourant is provided in and/or on a thread or extruded element extending longitudinally through the rod of filtering material. 
     
     
         12 . The filter according to  claim 11 , wherein the channel which extends along the full length of the filter or is semi-cylindrical and the thread or extruded element is provided in the rod of filtering material adjacent the semi-cylindrical channel. 
     
     
         13 . The filter according to  claim 1 , wherein the filtering material comprises carbon or activated carbon. 
     
     
         14 . The filter according to  claim 1 , further comprising a wrapper or plugwrap. 
     
     
         15 . The filter according to  claim 14 , wherein the wrapper or plug wrap is derived from a plant in the  Cannabis  genus, for example  Cannabis sativa , for example  Cannabis sativa sativa, Cannabis sativa indica  or  Cannabis sativa ruderalis,  or a mixture thereof. 
     
     
         16 . The filter according to  claim 14 , wherein ventilation holes are provided within the wrapper and/or the plug wrap. 
     
     
         17 . A multiple rod comprising a plurality of filters according to  claim 1  integrally joined end-to-end in a mirror image relationship. 
     
     
         18 . The filter according to  claim 1  for use with a smoking article comprising one or more smokable material(s) other than tobacco. 
     
     
         19 . The filter according to  claim 18 , wherein the smokable material other than tobacco is prepared from a plant in the  Cannabis  genus, for example  Cannabis sativa,  for example  Cannabis saliva sativa, Cannabis sativa indica  or  Cannabis sativa ruderalis,  or a mixture thereof. 
     
     
         20 . The filter according to  claim 18 , wherein the smokable material other than tobacco comprises oregano or hemp. 
     
     
         21 . The filter according to  claim 2  for filtering the smoke of a smoking article comprising one or more smokable material(s) other than tobacco. 
     
     
         22 . The filter of  claim 21 , wherein the smokable material other than tobacco is prepared from a plant in the  Cannabis  genus, for example  Cannabis sativa,  for example  Cannabis sativa sativa, Cannabis sativa indica  or  Cannabis sativa ruderalis,  or a mixture thereof. 
     
     
         23 . The filter of  claim 21 , wherein the smokable material other than tobacco comprises oregano or hemp. 
     
     
         24 . A smoking article comprising the filter according to  claim 1  joined to a wrapped rod comprising a smokable material other than tobacco. 
     
     
         25 . The smoking article according to  claim 24 , wherein the smokable material other than tobacco is prepared from a plant in the  Cannabis  genus, for example  Cannabis sativa,  for example  Cannabis sativa sativa, Cannabis sativa indica  or  Cannabis sativa ruderalis,  or a mixture thereof. 
     
     
         26 . The smoking article according to  claim 24 , wherein the smokable material other than tobacco comprises oregano or hemp.