Multi-Zone Aerosol Heating Substrate Control
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Solution Overview
Problem
Existing aerosol generation technologies, such as heat-not-burn devices and e-cigarette/tobacco hybrid devices, face inefficiencies in aerosol delivery and power consumption due to the need for prolonged heating of solid tobacco materials, which can lead to condensation of volatilized components and suboptimal puff profiles.
Innovation Solution
A method and device utilizing at least three heating zones to sequentially heat an aerosol-generating substrate to different temperatures, ensuring that only the section being aerosolized is at the aerosol-generation temperature, while others are at intermediate or minimum operating temperatures to prevent condensation and optimize power consumption, using an amorphous solid material that allows for rapid aerosol delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the solid aerosolizable material is heated continuously to aerosol-generation temperature, then aerosol can be generated, but condensation of volatilized components occurs and power consumption increases
Solution Approach 1:
The substrate is divided into multiple sections, each heated by a separate heating zone. Only the section currently being aerosolized is heated to aerosol-generation temperature, while other sections are maintained at lower temperatures or cooled, eliminating the need for continuous heating of the entire substrate and preventing condensation of volatilized components.
Solution Approach 2:
The heating zones operate in a sequential, periodic manner where each zone cycles through heating to aerosol-generation temperature, maintaining intermediate temperature, and cooling to minimum operating temperature. This periodic action ensures continuous aerosol delivery while minimizing energy consumption by heating only when and where needed.
2Productivity
If the solid aerosolizable material is heated to aerosol-generation temperature, then aerosol is generated, but heating time is prolonged and puff profile is suboptimal
Solution Approach 1:
The heating zones are pre-positioned and can be activated sequentially. Before a section is needed for aerosol generation, it can be pre-heated to intermediate temperature, reducing the time required to reach aerosol-generation temperature when activation occurs. This preliminary preparation optimizes the puff profile by ensuring rapid heating when needed.
Solution Approach 2:
The system dynamically adjusts the temperature of each heating zone based on real-time requirements. Each zone transitions between aerosol-generation temperature, intermediate temperature, and minimum operating temperature as sections move through the aerosolization process, enabling rapid response and optimized heating time for each puff.
3Productivity
If multiple sections of substrate are heated simultaneously to aerosol-generation temperature, then aerosol delivery is continuous, but power consumption increases and condensation occurs
Solution Approach 1:
The substrate and heating system are segmented into multiple independent zones. Each zone can be controlled separately, allowing only the necessary number of zones to be active at any given time. This segmentation enables continuous aerosol delivery through sequential activation while minimizing the number of zones heated to high temperature, reducing power consumption and preventing condensation.
Solution Approach 2:
While only one or a few sections are heated to aerosol-generation temperature at any moment, the sequential operation of multiple heating zones ensures continuous aerosol delivery. As one zone completes its aerosolization cycle and cools down, the next zone is activated, maintaining uninterrupted aerosol flow without requiring simultaneous heating of all sections.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances aerosol delivery efficiency and power consumption by preventing condensation of volatilized components and allowing for rapid aerosol generation, providing a better puff profile and reducing heating time, especially suitable for amorphous solid materials that can contain higher aerosolizable component concentrations.
Implementation Method 1
The heating volatilizes at least one component of the material, typically forming an inhalable aerosol
Implementation Method 2
at least one of the remaining sections of substrate are heated to a minimum operating temperature which is at least sufficient to prevent condensation of volatilized components on or in the vicinity of those sections
Data Source
AI summary
Described herein is a method of generating aerosol from an aerosol-generating substrate using an aerosol-generating device, the aerosol-generating device comprising at least three heating zones disposed so as to each heat a different section of the substrate to generate an aerosol without burning. The method comprises sequentially generating aerosol from each different section of substrate, wherein during heating; (i) a section of substrate is heated to an aerosol-generation temperature; (ii) another section of substrate which is heated to an intermediate temperature which is below the aerosol-generation temperature but and approximately equal to or above the minimum operating temperature; (iii) at least one of the remaining sections of substrate are heated to a minimum operating temperature which is at least sufficient to prevent condensation of volatilized components on or in the vicinity of those sections; and wherein once aerosol has been generated from a section, (a) the temperature in that section is reduced from the aerosol-generation temperature to the minimum operating temperature, (b) the section previously heated to the intermediate temperature is heated to the aerosol-generation temperature, and (c) a further section is heated to the intermediate temperature.