Heating Method for a Flat-Shaped Heating Chamber of an Aerosol Generating Device and Associated Aerosol Generating Device

Abstract

A heating method is provided for a flat-shaped heating chamber of an aerosol generating device configured to operate with a flat-shaped tobacco article including a substrate part, the substrate part defining two opposite heating surfaces, the heating chamber including two heating elements arranged to face each other, each heating element being designed to extend along substantially the whole area of the respective heating surface. The method includes carrying out a pre-heating phase including powering only one heating element until achieving a target temperature; and carrying out a vaping phase by powering each heating element according to different heating profiles, at least one heating profile including powering of the corresponding heating element within predetermined heating intervals according to a predefined powering value.

1 . A heating method for a flat-shaped heating chamber of an aerosol generating device configured to operate with a flat-shaped tobacco article comprising a substrate part, the substrate part defining two opposite heating surfaces, the heating chamber comprising two heating elements arranged to face each other;
 the method comprising the following steps:
 carry out a pre-heating phase comprising powering only one of the heating elements until achieving a target temperature; and 
 carry out a vaping phase by powering each heating element according to different heating profiles, at least one of the heating profiles comprising powering of the corresponding heating element within predetermined heating intervals according to a predefined powering value. 
   
     
     
         2 . The heating method according to  claim 1 , wherein the heating intervals are defined by temperature of the corresponding heating element. 
     
     
         3 . The heating method according to  claim 2 , wherein each heating interval is carried out until achieving a predetermined temperature. 
     
     
         4 . The heating method according to  claim 1 , wherein the heating intervals are defined by time. 
     
     
         5 . The heating method according to  claim 4 , wherein the heating intervals are equispaced by a predetermined time value. 
     
     
         6 . The heating method according to  claim 5 , wherein the heating intervals are substantially equal. 
     
     
         7 . The heating method according to  claim 1 , wherein, between the heating intervals, the corresponding heating profile comprises:
 powering of the corresponding heating element according to a minimal powering value strictly smaller than the predefined powering value; or   cutting off the power.   
     
     
         8 . The heating method according to  claim 1 , wherein during the pre-heating phase, the corresponding heating element is powered according to the predefined powering value. 
     
     
         9 . The heating method according to  claim 1 , wherein the pre-heating phase further comprises powering the other heating element until achieving the target temperature. 
     
     
         10 . The heating method according to  claim 1 , wherein each heating profile comprises powering of the corresponding heating element within predetermined heating intervals according to the predefined powering value. 
     
     
         11 . The heating method according to  claim 10 , wherein the heating profiles of different heating elements are configured to power alternatively according to the predefined powering value the corresponding heating elements. 
     
     
         12 . The heating method according to  claim 11 , wherein the heating profiles have substantially the same shape, one of the heating profiles being in offset in respect with the other heating profile to ensure alternative powering of the heating elements. 
     
     
         13 . The heating method according to  claim 1 , wherein the target temperature is between 260° C. and 300° C. 
     
     
         14 . An aerosol generating device configured to operate with a flat-shaped tobacco article comprising a substrate part, the substrate part defining two opposite heating surfaces, the aerosol generating device comprising:
 a heating chamber configured to receive the flat-shaped tobacco article and comprising two heating elements arranged to face each other;   a controller configured to operate the heating elements according to the heating method according to  claim 1 .   
     
     
         15 . The aerosol generating device according to  claim 14 , wherein each heating element is made from ceramics. 
     
     
         16 . The heating method according to  claim 3 , wherein the predetermined temperature is substantially equal to the target temperature. 
     
     
         17 . The heating method according to  claim 5 , wherein the predetermined time value is between 20 and 30 seconds. 
     
     
         18 . The heating method according to  claim 5 , wherein the duration of each heating interval is substantially equal to the predetermined time value. 
     
     
         19 . The heating method according to  claim 8 , wherein the predefined powering value is a maximum powering value. 
     
     
         20 . The heating method according to  claim 1 , wherein the target temperature is substantially equal to 280° C.