Smoking article comprising a combustible heat source with at least one airflow channel

Abstract

A smoking article is provided, including a combustible heat source having opposed front and rear faces; one or more airflow channels extending from the front face to the rear face; an aerosol-forming substrate downstream of the rear face; a mouthpiece downstream of the aerosol-forming substrate; and one or more air inlets located downstream of the rear face and upstream of the mouthpiece. The one or more air inlets are located between the rear face and a downstream end of the aerosol-forming substrate. Air drawn through the aerosol-forming substrate enters the smoking article through the one or more airflow channels and the one or more air inlets, and at least some of the air drawn through the aerosol-forming substrate comes into direct contact with a combustible portion of the combustible heat source.

1 . A smoking article, comprising:
 a combustible heat source having opposed front and rear faces;   one or more airflow channels extending from the front face to the rear face of the combustible heat source;   an aerosol-forming substrate downstream of the rear face of the combustible heat source;   a mouthpiece downstream of the aerosol-forming substrate; and   one or more air inlets located downstream of the rear face of the combustible heat source and upstream of the mouthpiece, wherein the one or more air inlets are located between the rear face and a downstream end of the aerosol-forming substrate,   wherein the smoking article is configured such that air drawn through the aerosol-forming substrate enters the smoking article through the one or more airflow channels and the one or more air inlets, and at least some of the air drawn through the aerosol-forming substrate comes into direct contact with a combustible portion of the combustible heat source.   
     
     
         2 . The smoking article according to  claim 1 , further comprising an outer wrapper circumscribing the aerosol-forming substrate and at least a rear portion of the combustible heat source. 
     
     
         3 . The smoking article according to  claim 1 , further comprising one of: (i) a non-combustible substantially air impermeable first barrier between the rear face of the combustible heat source and the aerosol-forming substrate; and (ii) a non-combustible substantially air impermeable second barrier between the combustible heat source and the one or more airflow channels. 
     
     
         4 . The smoking article according to  claim 1 , further comprising (i) a non-combustible substantially air impermeable first barrier between the rear face of the combustible heat source and the aerosol-forming substrate, wherein the first barrier comprises a first barrier coating provided on the rear face of the combustible heat source. 
     
     
         5 . The smoking article according to  claim 4 , further comprising (ii) a non-combustible substantially air impermeable second barrier between the combustible heat source and the one or more airflow channels, wherein the second barrier comprises a second barrier coating provided on an inner surface of the one or more airflow channels. 
     
     
         6 . The smoking article according to  claim 1 , wherein the one or more air inlets comprise one or more first air inlets around the periphery of the aerosol-forming substrate. 
     
     
         7 . The smoking article according to  claim 1 , wherein the aerosol-forming substrate abuts the rear face of the combustible heat source. 
     
     
         8 . The smoking article according to  claim 1 , wherein the aerosol-forming substrate is spaced apart from the rear face of the combustible heat source. 
     
     
         9 . The smoking article according to  claim 8 , wherein the one or more air inlets comprise one or more second air inlets between the rear face of the combustible heat source and the aerosol-forming substrate. 
     
     
         10 . The smoking article according to  claim 1 , further comprising:
 a heat-conducting element around a rear portion of the combustible heat source and at least a front portion of the aerosol-forming substrate.   
     
     
         11 . The smoking article according to  claim 1 , wherein the aerosol-forming substrate comprises a tobacco-based material and at least one aerosol former. 
     
     
         12 . The smoking article according to  claim 1 , wherein the combustible heat source is a combustible carbonaceous heat source. 
     
     
         13 . The smoking article according to  claim 1 , wherein the combustible heat source comprises an ignition aid. 
     
     
         14 . The smoking article according to  claim 1 , further comprising:
 a transfer element between the aerosol-forming substrate and the mouthpiece.   
     
     
         15 . The smoking article according to  claim 1 , further comprising one or more aerosol modifying agents downstream of the aerosol-forming substrate.