Smoking Article Filter

Abstract

A filter for a smoking article comprising first and second sections, the first section being at the mouth end of the filter and comprising a cylindrical element circumscribed by a wrapper and having a hollow portion extending therethrough, and the second section being longitudinally aligned with and adjacent to the first section and comprising a filtration material. The second section comprises a particulate material in a circumferential region and extending to the end of the second section immediately adjacent the first section. Also provided is a smoking article incorporating a filter according to the invention.

1 . A filter for a smoking article comprising a first and a second section, the first section being at a mouth end of the filter and comprising a cylindrical element having a hollow portion extending therethrough and being circumscribed by a wrapper, and the second section being longitudinally aligned with and adjacent to the first section and comprising a filtration material, wherein the second section comprises a particulate material in a circumferential region thereof, the particulate material extending to an end of the second section immediately adjacent the first section. 
   
   
       2 . The filter according to  claim 1 , wherein the particulate material extends over a full longitudinal length of the second section. 
   
   
       3 . The filter according to  claim 1 , wherein two or more portions of the circumferential region of the second section comprise particulate material. 
   
   
       4 . The filter according to  claim 3 , wherein the two or more portions are spaced circumferentially from one another. 
   
   
       5 . The filter according to  claim 4 , wherein the two or more portions are arranged symmetrically around the second section. 
   
   
       6 . The filter according to  claim 1 , wherein a wrapper surrounds the second section and the particulate material is adhered to a surface of the wrapper. 
   
   
       7 . The filter according to  claim 6 , wherein the particulate material is adhered to an inner surface of the wrapper surrounding the second section. 
   
   
       8 . The filter according to  claim 1 , wherein the particulate material is an adsorbent. 
   
   
       9 . The filter according to  claim 8 , wherein the particulate material is activated carbon. 
   
   
       10 . The filter according to  claim 1 , wherein the second section further comprises a particulate material interspersed in the filtration material. 
   
   
       11 . The filter according to  claim 1 , wherein the cylindrical element has a wall defined by the outer surface of the element and the hollow portion extending therethrough, the wall being of a thickness to at least partly occlude the particulate material in a circumferential region of the second section at the point of abutment of the first and second sections. 
   
   
       12 . The filter according to  claim 1 , wherein the wrapper circumscribing the first section is a plugwrap. 
   
   
       13 . The filter according to  claim 12 , wherein the plugwrap has a base weight of less than 50 g/m 2 . 
   
   
       14 . The filter according to  claim 1 , wherein the cylindrical element of the first section comprises cellulose acetate. 
   
   
       15 . The filter according to  claim 1 , further comprising at least one additional filter section at the tobacco rod end of the filter. 
   
   
       16 . The filter according to  claim 1  wherein two or more portions of the circumferential region of the second section comprise particulate material, and the two or more portions are spaced circumferentially from one another, wherein a wrapper surrounds the second section and the particulate material is adhered to a surface of the wrapper, and the particulate material is adhered to an inner surface of the wrapper surrounding the second section. 
   
   
       17 . The filter according to  claim 1  configured as a component within a smoking article.