Aerosol generating article and aerosol generating system including the same

Abstract

An aerosol generating article may include an aerosol generating rod that is heated to generate aerosols, and an expansion unit that is arranged inside the aerosol generating rod and expands upon contact with the aerosols.

What is claimed is: 
     
         1 . An aerosol generating article comprising:
 an aerosol generating rod that is heated to generate aerosols; and   an expansion unit that is arranged inside the aerosol generating rod and expands by contact with the aerosols or by heat.   
     
     
         2 . The aerosol generating article of  claim 1 , wherein the expansion unit has an expansion rate of 5% to 50% in a direction crossing a longitudinal direction of the aerosol generating article, at a temperature of 100° C. to 350° C. 
     
     
         3 . The aerosol generating article of  claim 1 , wherein the expansion unit extends in a longitudinal direction of the aerosol generating rod, and
 a length of the expansion unit is 20% to 100% of a length of the aerosol generating rod.   
     
     
         4 . The aerosol generating article of  claim 1 , wherein the expansion unit comprises at least one expansion material selected from a group consisting of carboxymethyl cellulose, amorphous cellulose, cross-linked carmellose sodium, sodium silicate, and bentonite. 
     
     
         5 . The aerosol generating article of  claim 1 , wherein the expansion unit comprises a compressed pulp sheet. 
     
     
         6 . The aerosol generating article of  claim 1 , wherein the expansion unit comprises an oxidizer that generates an exothermic reaction upon contact with the aerosols. 
     
     
         7 . The aerosol generating article of  claim 6 , wherein the oxidizer comprises at least one transition metal salt selected from a group consisting of manganese oxide and chromium oxide. 
     
     
         8 . The aerosol generating article of  claim 6 , wherein the expansion unit comprises a deformable member comprising a deformable material, and the deformable member forms an accommodation space that accommodates the oxidizer. 
     
     
         9 . The aerosol generating article of  claim 1 , wherein the expansion unit comprises a structure that supports an expansion material, and
 the structure comprises a prevention member that is arranged in at least one end portion of the expansion unit, to prevent the expansion material from expanding in a longitudinal direction of the aerosol generating rod.   
     
     
         10 . The aerosol generating article of  claim 9 , wherein the prevention member comprises a porous material. 
     
     
         11 . The aerosol generating article of  claim 1 , wherein the expansion unit comprises: a structure comprising a hollow portion therein; and an expansion material located inside the hollow portion, and
 the structure comprises a flexible material that is deformed by expansion of the expansion material.   
     
     
         12 . The aerosol generating article of  claim 1 , wherein the expansion unit comprises: a structure comprising a hollow portion therein; and an expansion material located inside the hollow portion,
 the structure comprises a first structure and a second structure, each extending in a circumferential direction of the structure, and   the first structure and the second structure are detachably coupled to each other in a direction crossing a longitudinal direction of the structure.   
     
     
         13 . The aerosol generating article of  claim 1 , further comprising a front-end plug arranged upstream of the aerosol generating rod, wherein the front-end plug has a tube shape comprising a hollow portion therein. 
     
     
         14 . The aerosol generating article of  claim 1 , wherein the aerosol generating rod comprises a first aerosol generating rod that is heated to generate aerosols and a second aerosol generating rod that is heated to generate aerosols comprising nicotine vapor, and
 the expansion unit is arranged inside the second aerosol generating rod.   
     
     
         15 . An aerosol generating system comprising:
 the aerosol generating article of  claim 1 ; and   an aerosol generating device comprising an insertion space into which the aerosol generating article is inserted and a heater surrounding the insertion space.