Aerosol-generating article with non-circular perforations in a ventilation zone

Abstract

An aerosol-generating article, including: a rod of aerosol-generating substrate including between 5 percent to 30 percent aerosol former by weight on a dry weight basis; and a ventilation zone arranged downstream of the rod, the ventilation zone being arranged in a hollow tubular segment of a cardboard aerosol-cooling element, and the ventilation zone being configured as a hollow tubular ventilation zone, the ventilation zone including perforations, one or more of the perforations having a non-circular cross-section having an ovality, the ovality being a ratio of a large diameter of a perforation divided by a small diameter of the perforation, of at least 1.5, a thickness of the peripheral wall of the ventilation zone being between 0.1 millimeter and 2.5 millimeters, one or more perforations having a width of between 0.05 millimeter and 0.2 millimeter, and one or more perforations having a length of between 0.25 millimeter and 1.0 millimeter.

1 . An aerosol-generating article, comprising:
 a rod of aerosol-generating substrate comprising between 5 percent to 30 percent aerosol former by weight on a dry weight basis; and   a ventilation zone arranged downstream of the rod of aerosol-generating substrate, wherein the ventilation zone is arranged in a hollow tubular segment of a cardboard aerosol-cooling element, and wherein the ventilation zone is configured as a hollow tubular ventilation zone,   wherein the ventilation zone comprises perforations, wherein one or more of the perforations have a non-circular cross-section having an ovality, the ovality being a ratio of a large diameter of a perforation divided by a small diameter of the perforation, of at least 1.5, wherein a thickness of the peripheral wall of the ventilation zone is between 0.1 millimeter and 2.5 millimeters, wherein one or more perforations have a width of between 0.05 millimeter and 0.2 millimeter, and wherein one or more perforations have a length of between 0.25 millimeter and 1.0 millimeter.   
     
     
         2 . The aerosol-generating article according to  claim 1 , wherein one or more of the perforations have an oval cross-section. 
     
     
         3 . The aerosol-generating article according to  claim 1 , wherein one or more of the perforations are slit-shaped. 
     
     
         4 . The aerosol-generating article according to  claim 1 , wherein for one or more of the perforations, the length of the perforations is larger than the width of the perforations. 
     
     
         5 . The aerosol-generating article according to  claim 4 , wherein for one or more of the perforations, a longitudinal axis of the perforation is parallel to a longitudinal axis of the aerosol-generating article. 
     
     
         6 . The aerosol-generating article according to  claim 1 , wherein the ovality of the perforations is at least 2. 
     
     
         7 . The aerosol-generating article according to  claim 1 , wherein an inner diameter of the hollow tubular ventilation zone is between 2.5 millimeter and 5.0 millimeters. 
     
     
         8 . The aerosol-generating article according to  claim 1 ,
 wherein the ventilation zone is arranged in a hollow tubular segment of an aerosol-cooling element, and   wherein the hollow tubular segment has an inner volume of between 130 mm 3  and 200 mm 3 .   
     
     
         9 . The aerosol-generating article according to  claim 1 , wherein a distance between the perforations of the ventilation zone and a downstream end of the rod of aerosol-generating substrate is between 1 millimeter and 6 millimeters. 
     
     
         10 . The aerosol-generating article according to  claim 1 , wherein a distance between the perforations of the ventilation zone and a downstream end of the aerosol-generating article is between 10 millimeters and 26 millimeters. 
     
     
         11 . The aerosol-generating article according to  claim 1 , wherein the perforations are configured to allow ambient air to be drawn into the ventilation zone. 
     
     
         12 . The aerosol-generating article according to  claim 11 , wherein a ratio of ambient air drawn into the ventilation zone through the perforations and air drawn into the ventilation zone through the rod of aerosol-forming substrate is between 5 percent and 75 percent. 
     
     
         13 . The aerosol-generating article according to  claim 1 ,
 further comprising a filter plug downstream of the ventilation zone,   wherein a resistance to draw of the filter plug is between 5 millimetres H 2 O and 80 millimetres H 2 O.   
     
     
         14 . The aerosol-generating article according to  claim 1 ,
 further comprising a substrate wrapper at least partly circumscribing the rod of aerosol-forming substrate,   wherein the substrate wrapper has a  5  thickness of 50 micrometers or more.   
     
     
         15 . An aerosol-generating system comprising an aerosol-generating device having a cavity configured to receive the aerosol-generating article according to  claim 1 .