Aerosol-Generating Device Staged Heating for First-Puff Consistency
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Solution Overview
Problem
Existing aerosol-generating devices struggle to deliver a large amount of volatile compounds in the first puff and maintain consistent delivery throughout the user experience.
Innovation Solution
A method involving a heating chamber with a heating element that heats the aerosol-forming substrate from within, controlling the power to increase the temperature to a range of 245-285°C for a predetermined time, followed by adjustments to maintain or adjust the temperature in subsequent time periods to ensure consistent volatile compound delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the heating element temperature is increased rapidly to vaporize volatile compounds, then the amount of vaporized compounds in the first puff is improved, but the thermal inertia of the aerosol-forming substrate causes inconsistent delivery throughout the user experience
Solution Approach 1:
The heating element temperature is dynamically adjusted through multiple heating modes (first, second, and third modes with different temperature profiles) to match the depletion of volatile compounds over time, ensuring consistent delivery throughout the user experience rather than maintaining a static temperature
Solution Approach 2:
The patent changes the temperature parameter of the heating element across different heating modes to optimize vaporization at different stages of substrate consumption, transitioning from higher temperatures in early stages to adjusted temperatures as compounds deplete
2Quantity of substance
If a high aerosol former content (>30% by weight) is used in the substrate, then the thermal inertia is increased making temperature control difficult, but this same high content is needed to deliver sufficient volatile compounds
Solution Approach 1:
The heating process is segmented into multiple distinct heating modes with different temperature profiles and duration characteristics, allowing the system to manage the thermal inertia of high aerosol former content substrates through staged heating rather than single-mode operation
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
Improves the amount of vaporized desired volatile compounds in the aerosol from the first puff and maintains a consistent sensorial experience by overcoming thermal inertia and adjusting temperatures to match compound depletion.
Implementation Method 1
an aerosol is generated by the transfer of heat from the heat source to a physically separate aerosol-forming substrate
Implementation Method 2
volatile compounds are released from the aerosol-forming substrate by heat transfer to the aerosol-forming substrate from the heat source
Implementation Method 3
By heating the heating element to within this range of temperatures for the first predetermined time period, the thermal inertia of the aerosol-forming substrate is overcome
Implementation Method 4
As the released compounds cool, they condense to form an aerosol that is inhaled by the user
Data Source
AI summary
A method of controlling aerosol production in an aerosol-generating device is provided, the device including a heating chamber to receive an aerosol-generating article including an aerosol-forming substrate; a heating system associated with a heating element to internally heat the substrate from within the substrate; and a power source to provide power to the heating system, the method including receiving the article by the chamber, the substrate having a total aerosol former content greater than 30% by weight and being a solid or gel; heating the substrate by controlling power to: increase a temperature of the heating element to a first temperature, and maintain the first temperature constant for a first time period; controlling power to, during a pre-heating time period before the first time period, increase the temperature from ambient to the initial temperature; and calibrating the heating element after the pre-heating time period and before the first time period.