An Aerosol Generating Article

Abstract

An aerosol generating article for an aerosol generating device includes an aerosol generating substrate and a filter circumscribed by a wrapper. At least a portion of the filter includes a thermochromic material and a flavouring. The thermochromic material is capable of undergoing a temperature dependent irreversible colour change at or above a threshold temperature to cause a colour change of the at least a portion of the filter.

1 . An aerosol generating article for an aerosol generating device, wherein the aerosol generating article comprises an aerosol generating substrate and a filter circumscribed by a wrapper, the filter comprising a tip, wherein the filter comprises a thermochromic material and a flavouring, the thermochromic material being comprised only in the tip of the filter, wherein the thermochromic material is configured for undergoing a temperature dependent irreversible colour change at or above a threshold temperature to cause a colour change of the tip of the filter. 
     
     
         2 . The aerosol generating article according to  claim 1 , wherein below the threshold temperature the thermochromic material imparts a colour on the tip of the filter which is different from a natural colour of the filter material. 
     
     
         3 . The aerosol generating article according to  claim 1 , wherein below the threshold temperature the colour of the tip of the filter is indicative of an identity of the flavouring. 
     
     
         4 . The aerosol generating article according to  claim 1 , wherein at least one of the thermochromic material or flavouring is impregnated into the material of the tip of the filter. 
     
     
         5 . The aerosol generating article according to  claim 1 , wherein at least one of the thermochromic material or flavouring is evenly dispersed throughout the tip of the filter. 
     
     
         6 . The aerosol generating article according to  claim 1 , wherein a concentration of at least one of thermochromic material or flavouring comprised in the tip of the filter varies at different locations, or is comprised in at least a portion of the filter only at selected isolated locations. 
     
     
         7 . The aerosol generating article according to  claim 1 , wherein the flavouring is comprised in a portion only of the filter. 
     
     
         8 . The aerosol generating article according to  claim 1 , wherein the flavouring is comprised in whole of the filter. 
     
     
         9 . The aerosol generating article according to  claim 1 , wherein the threshold temperature is from 50° C. to 250° C. 
     
     
         10 . The aerosol generating article according to  claim 1 , wherein the thermochromic material comprises any of: copper (I) iodide (CuI), 2Cu(CNS) 2 ·2pyridine, or ammonium metavanadate (NH 4 VO 3 ). 
     
     
         11 . The aerosol generating article according to  claim 1 , wherein the thermochromic material and the flavouring are comprised in a solution and wherein the tip of the filter comprises the solution. 
     
     
         12 . A method of manufacturing an aerosol generating article for an aerosol generating device, wherein the aerosol generating article comprises an aerosol generating substrate and a filter circumscribed by a wrapper, the filter comprising a tip, wherein the method comprises:
 incorporating a thermochromic material and a flavouring in the filter, the thermochromic material being incorporated only in the tip of the filter, wherein the thermochromic material is configured for undergoing a temperature dependent irreversible colour change at or above a threshold temperature to cause a colour change of the tip of the filter.   
     
     
         13 . The method according to  claim 12 , wherein the thermochromic material and flavouring is comprised in a solution, wherein the method comprises:
 applying the solution to the tip of the filter.   
     
     
         14 . The method according to  claim 12 , wherein the thermochromic material and flavouring is comprised in a solution, wherein the method comprises:
 dipping the tip of the filter in the solution.   
     
     
         15 . The method according to  claim 13 , wherein the solution comprises a carrier solvent, wherein the method comprises:
 evaporating at least some of the carrier solvent during manufacture of the aerosol generating article.   
     
     
         16 . The aerosol generating article according to  claim 7 , wherein the portion is the tip of the filter.