Aerosol-generating article having a low-rtd substrate and an upstream section

Abstract

An aerosol-generating article is provided, including: a rod of aerosol-generating substrate having a length of between 8 millimetres and 16 millimetres and a resistance-to-draw (RTD) of between 4 millimetres H2O and 10 millimetres H2O; a downstream section provided downstream of the rod of aerosol-generating substrate, the downstream section including at least one hollow tubular segment; and an upstream element provided upstream of the rod of aerosol-generating substrate and abutting an upstream end of the rod of aerosol-generating substrate, the upstream element having a length of between 2 millimetres and 8 millimetres and being formed of a hollow tubular segment defining a longitudinal cavity providing an unrestricted flow channel.

1 .- 15 . (canceled) 
     
     
         16 . An aerosol-generating article, comprising:
 a rod of aerosol-generating substrate having a length of between 8 millimetres and 16 millimetres and a resistance-to-draw (RTD) of between 4 millimetres H 2 O and 10 millimetres H 2 O;   a downstream section provided downstream of the rod of aerosol-generating substrate, the downstream section comprising at least one hollow tubular segment; and   an upstream element provided upstream of the rod of aerosol-generating substrate and abutting an upstream end of the rod of aerosol-generating substrate, the upstream element having a length of between 2 millimetres and 8 millimetres and being formed of a hollow tubular segment defining a longitudinal cavity providing an unrestricted flow channel.   
     
     
         17 . The aerosol-generating article according to  claim 16 , wherein the upstream element has an RTD of less than 1.5 millimetres H 2 O per 5 millimetres length. 
     
     
         18 . The aerosol-generating article according to  claim 16 , wherein the upstream element has an RTD of less than 2 millimetres H 2 O. 
     
     
         19 . The aerosol-generating article according to  claim 16 , wherein the hollow tubular segment of the upstream element has a wall thickness of less than 1 millimetre. 
     
     
         20 . The aerosol-generating article according to  claim 16 , wherein the longitudinal cavity of the hollow tubular segment of the upstream element has a diameter of at least 5 millimetres. 
     
     
         21 . The aerosol-generating article according to  claim 16 , wherein the aerosol-generating article has an RTD of between 20 millimetres H 2 O and 22 millimetres H 2 O. 
     
     
         22 . The aerosol-generating article according to  claim 16 , wherein a combined RTD of the upstream element and the rod of aerosol-generating substrate is less than 10 millimetres H 2 O. 
     
     
         23 . The aerosol-generating article according to  claim 16 ,
 further comprising a ventilation zone at a location along the at least one hollow tubular segment of the downstream section,   wherein an RTD of a portion of the aerosol-generating article upstream of the ventilation zone is between 10 millimetres H 2 O and 12 millimetres H 2 O.   
     
     
         24 . The aerosol-generating article according to  claim 16 , wherein the at least one hollow tubular segment of the downstream section has a length of between 17 millimetres and 25 millimetres. 
     
     
         25 . The aerosol-generating article according to  claim 16 , wherein the downstream section further comprises a mouthpiece element having a length of between 5 millimetres and 9 millimetres. 
     
     
         26 . The aerosol-generating article according to  claim 25 , wherein an RTD of the mouthpiece element is between 6 millimetres H 2 O and 10 millimetres H 2 O. 
     
     
         27 . The aerosol-generating article according to  claim 16 , wherein the aerosol-generating substrate comprises shredded tobacco material. 
     
     
         28 . The aerosol-generating article according to  claim 27 , wherein the shredded tobacco material has a density of between 150 mg per cubic centimetre and 500 mg per cubic centimetre. 
     
     
         29 . The aerosol-generating article according to  claim 16 , wherein the upstream element has a length of between 4 millimetres and 6 millimetres. 
     
     
         30 . The aerosol-generating article according to  claim 16 , wherein the aerosol-generating substrate comprises one or more aerosol formers and wherein the content of aerosol former in the aerosol-forming substrate is at least 10 percent by weight, on a dry weight basis.