Segmented Aerosol-Forming Substrate for Uniform Heating
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Solution Overview
Problem
Conventional aerosol-generating devices face challenges in achieving uniform temperature distribution across the aerosol-forming substrate, leading to inconsistent aerosol composition and user experience due to the combustion of tobacco, which produces harmful by-products.
Innovation Solution
The design incorporates an aerosol-generating system with an aerosol-forming article featuring a downstream segment with a greater outer diameter than the upstream segment, allowing for a thinner aerosol-forming substrate and an airflow passage between the substrate and device cavity, facilitating rapid heat propagation and reducing temperature fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the aerosol-forming substrate is heated uniformly, then the aerosol composition becomes consistent, but the device complexity increases due to the need for precise temperature control
Solution Approach 1:
The aerosol-generating article is divided into segments with different outer diameters (upstream segment with smaller diameter, downstream segment with larger diameter). This segmentation creates natural airflow passages that guide air flow along the substrate, improving heat distribution without requiring complex active temperature control systems.
Solution Approach 2:
The downstream segment has a larger outer diameter than the upstream segment, creating locally different airflow characteristics. This local geometric variation promotes better heat transfer in specific regions while maintaining simpler overall device architecture compared to uniformly heated designs requiring active control.
2Temperature
If air flows through the substrate, then cooling effect is achieved, but temperature uniformity deteriorates due to heat loss in certain regions
Solution Approach 1:
The substrate is segmented into regions with different diameters, creating controlled airflow passages. Air flows along the substrate surface through these passages rather than through the substrate material itself, providing cooling while maintaining temperature uniformity across the heating zone.
Solution Approach 2:
Air acts as an intermediary cooling medium that flows along the substrate surface through the airflow passage created by the diameter difference. This allows heat transfer from the substrate to the air without direct contact between air and substrate material, maintaining temperature uniformity while achieving cooling effect.
3Speed
If the substrate is made thinner, then heat propagation speed increases, but the substrate structural integrity decreases
Solution Approach 1:
The aerosol-generating article is segmented into an upstream segment and a downstream segment with different outer diameters. This segmentation allows the substrate to be thinner in the upstream region (faster heat propagation) while maintaining sufficient structural integrity through the larger-diameter downstream segment that provides mechanical support.
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 configuration ensures more uniform aerosol composition and a consistent user experience by promoting efficient heat transfer and minimizing unheated substrate regions, while reducing harmful by-products through heating instead of combustion.
Implementation Method 1
at least one heating element configured to heat the aerosol-forming substrate when the aerosol-forming substrate is received in the device cavity
Implementation Method 2
During heating, volatile compounds are released from the aerosol-forming substrate and become entrained in air
Implementation Method 3
an airflow passage is defined between the substrate outer surface and the device cavity inner surface, the airflow passage extending in the longitudinal direction along the length of the aerosol-forming substrate
Implementation Method 4
As the released volatile compounds cool, they condense to form an aerosol
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
An aerosol-generating system (40) comprising an aerosol-generating article (10) and an aerosol-generating device (30). The article (10) has an upstream end (11) and a downstream end (12), defines a longitudinal direction and comprises an upstream segment and a downstream segment (14). The upstream segment comprises an aerosol-forming substrate (13) having a substrate outer surface (17) with a substrate outer diameter (D2). The downstream segment (14) has a downstream segment outer diameter (D1) greater than the substrate outer diameter (D2). The device (30) comprises a device cavity inner surface (33) having a device cavity inner diameter (D4), the device cavity (32) being configured to receive at least the aerosol-forming substrate (13). The device (30) comprises at least one heating element (31). When the aerosol-forming substrate (13) is received in the device cavity (32), an airflow passage (35) is defined between the substrate outer surface (17) and the device cavity inner surface (33).