Smoking article including multilayer medium portion

Abstract

A smoking article including a multilayer medium portion is provided. The smoking article includes a filter portion and a medium portion including a first smoking material portion and a second smoking material portion. The first smoking material portion is surrounded entirely or partially by the second smoking material portion in a longitudinal direction of the medium portion, and tobacco raw materials included in the first smoking material portion and tobacco raw materials included in the second smoking material portion are different.

What is claimed is: 
     
         1 . A smoking article including a multilayer medium portion, the smoking article comprising:
 a filter portion; and   a medium portion including a first smoking material portion and a second smoking material portion,   wherein the first smoking material portion is surrounded entirely or partially by the second smoking material portion in a longitudinal direction of the medium portion, and tobacco raw materials included in the first smoking material portion and tobacco raw materials included in the second smoking material portion are different.   
     
     
         2 . The smoking article of  claim 1 , wherein:
 each of the first smoking material portion and the second smoking material portion includes additives in addition to a respective tobacco raw material, and   types and composition ratios of the additives included in the first smoking material portion are different from types and composition ratios of the additives included in the second smoking material portion.   
     
     
         3 . The smoking article of  claim 1 , wherein a transverse cross-section of the first smoking material portion has one of a circular shape, an elliptical shape, a regular polygon shape, and an irregular polygon shape, and the second smoking material portion has a shape corresponding to the shape of the first smoking material portion and surrounding the first smoking material portion. 
     
     
         4 . The smoking article of  claim 1 , further comprising a wrapper that wraps around an outer side surface of the first smoking material portion,
 wherein the first smoking material portion and the second smoking material portion are physically partitioned by the wrapper.   
     
     
         5 . The smoking article of  claim 4 , wherein the wrapper comprises at least one of porous wrapping paper, nonporous wrapping paper, grease-resistant wrapping paper, and water-resistant wrapping paper with a coated surface. 
     
     
         6 . The smoking article of  claim 1 , wherein a resistance to draw (RTD) of the first smoking material portion and an RTD of the second smoking material portion are different. 
     
     
         7 . The smoking article of  claim 6 , wherein a packing density of the tobacco raw materials included in the first smoking material portion and a packing density of the tobacco raw materials included in the second smoking material portion are different. 
     
     
         8 . The smoking article of  claim 6 , wherein:
 the first smoking material portion includes a plurality of first tobacco strands and the second smoking material portion includes a plurality of second tobacco strands, each of the plurality of first tobacco strands and the plurality of second tobacco strands produced using tobacco raw materials, and   one of the plurality of first tobacco strands and the plurality of second tobacco strands are packed to be parallel to each other in the longitudinal direction of the medium portion, and another one of the plurality of first tobacco strands and the plurality of second tobacco strands are packed in random arrays.   
     
     
         9 . The smoking article of  claim 1 , wherein aerosols generated in the first smoking material portion and the second smoking material portion move in a downstream direction and are mixed in the filter portion, and components of an aerosol generated in the first smoking material portion and components of an aerosol generated in the second smoking material portion are different. 
     
     
         10 . The smoking article of  claim 9 , wherein an amount of the aerosol generated in the first smoking material portion and an amount of the aerosol generated in the second smoking material portion are different.