Aerosol-generating article having wrapper with heat control element

Abstract

An aerosol-generating article for an aerosol-generating device having a heating element is provided, the article including: a rod of aerosol-generating substrate; and a wrapper at least partially circumscribing the rod, the wrapper including a heat control element on at least one surface of the wrapper, the heat control element including one or more circumferential bands of a heat-shrinkable material, configured such that upon heating of the heat-shrinkable material to a temperature above a shrink temperature thereof, an internal radius of each of the one of more circumferential bands of the heat-shrinkable material is reduced by at least 20 percent compared to an internal radius of the respective circumferential band prior to heating, whereby a portion of the substrate underlying the heat control element is deformed such that a resistance to draw (RTD) of the article is increased, and the shrink temperature is between about 180° C. and about 300° C.

1 .- 14 . (canceled) 
     
     
         15 . An aerosol-generating article for an aerosol-generating device having a heating element, the aerosol-generating article comprising:
 a rod of aerosol-generating substrate; and   a wrapper at least partially circumscribing the rod of aerosol-generating substrate, the wrapper comprising a heat control element on at least one surface of the wrapper, the heat control element comprising one or more circumferential bands of a heat-shrinkable material, configured such that upon heating of the heat-shrinkable material to a temperature above a shrink temperature thereof, an internal radius of each of the one of more circumferential bands of the heat-shrinkable material is reduced by at least 20 percent compared to an internal radius of the respective circumferential band prior to heating, whereby a portion of the aerosol-generating substrate underlying the heat control element is deformed such that a resistance to draw (RTD) of the aerosol-generating article is increased,   wherein the shrink temperature is between about 180 degrees Celsius and about 300 degrees Celsius.   
     
     
         16 . The aerosol-generating article according to  claim 15 , wherein upon heating the one or more circumferential bands of heat-shrinkable material to a temperature above the shrink temperature thereof, the RTD of the aerosol-generating article is increased to above 130 mm H 2 O. 
     
     
         17 . The aerosol-generating article according to  claim 15 , wherein a reduction in the internal radius of each of the one or more circumferential bands of the heat-shrinkable material upon heating to a temperature above the shrink temperature of the heat-shrinkable material is at least 30 percent compared to the internal radius of the respective circumferential band prior to heating. 
     
     
         18 . The aerosol-generating article according to  claim 15 , wherein said each of the one or more circumferential bands comprises a layer of a heat-shrinkable material on an inner surface of the wrapper. 
     
     
         19 . The aerosol-generating article according to  claim 18 , wherein each layer of heat-shrinkable material has a radial thickness of less than 0.5 mm. 
     
     
         20 . The aerosol-generating article according to  claim 15 , wherein the heat control element extends along at least 75 percent of a length of the rod of aerosol-generating substrate. 
     
     
         21 . The aerosol-generating article according to  claim 15 , wherein the heat control element overlies at least 90 percent of an external surface area of the rod of aerosol-generating substrate. 
     
     
         22 . The aerosol-generating article according to  claim 15 , wherein the heat control element further comprises a plurality of circumferential bands spaced apart along a length of the rod of aerosol-generating substrate. 
     
     
         23 . The aerosol-generating article according to  claim 15 , wherein the heat control element further comprises one or more circumferential bands of a first heat-shrinkable material having a first shrink temperature and one or more circumferential bands of a second heat-shrinkable material having a second shrink temperature higher than the first shrink temperature. 
     
     
         24 . The aerosol-generating article according to  claim 23 , wherein the second shrink temperature is at least 30 degrees Celsius higher than the first shrink temperature. 
     
     
         25 . The aerosol-generating article according to  claim 15 , wherein the one or more circumferential bands extend diagonally around the rod of aerosol-generating substrate relative to a longitudinal axis of the aerosol-generating article. 
     
     
         26 . The aerosol-generating article according to  claim 15 , wherein the one or more circumferential bands of heat-shrinkable material are formed from a material selected from: low density polyethylene (LDPE), linear low density polyethylene cellulose (LLDPE), polyolefin, enhanced polyethylene resin (EPE), and combinations thereof. 
     
     
         27 . The aerosol-generating article according to  claim 15 ,
 wherein the heat-shrinkable material is configured to reach or exceed the shrink temperature of the heat-shrinkable material when the aerosol-generating substrate is internally heated to a temperature above an internal threshold temperature or when the aerosol-generating substrate is externally heated to a temperature above an external threshold temperature,   wherein the internal threshold temperature is at least about 350 degrees Celsius, and   wherein the external threshold temperature is below about 200 degrees Celsius.   
     
     
         28 . An aerosol-generating system, comprising:
 an aerosol-generating article according to  claim 15 ; and   an aerosol-generating device configured to receive the aerosol-generating article, the aerosol-generating device comprising a heater element configured to heat the rod of aerosol-generating material, wherein the heater element is controlled during use to operate below a maximum operating temperature,   wherein the heat control element of the aerosol-generating article is configured such that the shrink temperature of the heat-shrinkable material is not exceeded during use of the aerosol-generating system with the heater element operating below the maximum operating temperature.