Tobacco material, method of manufacturing the tobacco material, filter including the tobacco material, and aerosol generating article including the filter

Abstract

A tobacco material includes a core including a first tobacco mixture, and a shell surrounding at least a portion of the core and including a second tobacco mixture, wherein the first tobacco mixture includes first tobacco particles and a flavor substance, the second tobacco mixture includes second tobacco particles, and the shell has a surface roughness (Ra) of about 5.0 to about 10.0.

1 . A tobacco material comprising:
 a core comprising a first tobacco mixture; and   a shell surrounding at least a portion of the core and comprising a second tobacco mixture,   wherein the first tobacco mixture comprises first tobacco particles and a flavor substance,   the second tobacco mixture comprises second tobacco particles, and   the shell has a surface roughness (Ra) of about 5.0 to about 10.0.   
     
     
         2 . The tobacco material of  claim 1 , wherein the first tobacco mixture comprises 90 wt % or more of the flavor substance, based on a total weight of the first tobacco mixture. 
     
     
         3 . The tobacco material of  claim 1 , wherein the core has a size of about 30 mesh to about 50 mesh, and
 the tobacco material has a size of about 18 mesh to about 25 mesh.   
     
     
         4 . The tobacco material of  claim 1 , wherein the tobacco material has a hardness of 90% or more. 
     
     
         5 . The tobacco material of  claim 1 , wherein the tobacco material comprises about 5.0 wt % to about 8.0 wt % of moisture, based on a total weight of the tobacco material. 
     
     
         6 . A filter of an aerosol generating article, the filter comprising the tobacco material according to  claim 1 . 
     
     
         7 . The filter of  claim 6 , further comprising:
 a first filter portion comprising a first filter element;   a flavor portion comprising the tobacco material according to  claim 1 ; and   a second filter portion comprising a second filter element,   wherein the first filter portion, the flavor portion, and the second filter portion are sequentially arranged in a longitudinal direction of the filter.   
     
     
         8 . A method of manufacturing a tobacco material, the method comprising:
 a first operation of manufacturing a core by using a first composition comprising a flavor substance; and   a second operation of forming a shell surrounding at least a portion of the core.   
     
     
         9 . The method of  claim 8 , wherein the first operation comprises growing the first composition by spraying the first composition in a fluidized-bed reactor at a temperature of about 30° C. to about 60° C. and under an air pressure of 1.5 bar or less. 
     
     
         10 . The method of  claim 8 , wherein the first composition comprises about 99% v/v to about 99% v/v of the flavor substance, about 0.5% v/v to about 5% v/v of tobacco power, and about 0.5% v/v to about 5% v/v of water. 
     
     
         11 . The method of  claim 8 , wherein the second operation comprises:
 positioning the core in a fluidized-bed reactor; and   coating a surface of the core with a second composition by spraying the second composition in the fluidized-bed reactor at a temperature of about 50° C. to about 90° C. and under an air pressure of 1.5 bar or less.   
     
     
         12 . The method of  claim 9 , wherein the second composition comprises about 10 wt % to about 20 wt % of tobacco powder, about 40 wt % to about 60 wt % of water, and about 30 wt % to about 40 wt % of ethanol.