Inductive Susceptor Joint Shielding for Uniform Aerosol Heating
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Solution Overview
Problem
Existing aerosol generating articles using induction heating systems face issues with the separation of edges in the tubular susceptor due to same polarity charges, leading to interrupted current flow and increased electrical resistance at the joint, which can result in non-uniform heating and potential re-use of previously heated aerosol forming material, causing undesirable flavor compounds.
Innovation Solution
The aerosol generating article incorporates a magnetic shielding material with opposite polarity to attract the edges of the tubular susceptor and a non-electrically conductive material to maintain electrical contact, ensuring uniform heating and preventing re-use by failing the joint upon initial activation, thereby avoiding undesirable flavor compounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a rod-shaped heating element is used in a cartridge, then the structural complexity is reduced and manufacturing is simplified, but the heating element becomes prone to breaking during assembly or use
Solution Approach 1:
The rod-shaped heating element is nested within a protective sleeve that extends along its length. The sleeve receives the heating element and provides mechanical protection, preventing breakage during assembly and use while maintaining the simplified rod structure.
Solution Approach 2:
The heating assembly combines the rod-shaped heating element with a protective sleeve structure, creating a composite component that leverages the heating properties of the rod element and the mechanical strength of the sleeve for enhanced durability.
2Reliability
If connections between components are made secure and robust, then the reliability of the aerosol generating system is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The connection structure merges the heating element, protective sleeve, and cartridge body into an integrated assembly. The sleeve acts as both a protective element and a structural connector, reducing the number of separate connection components needed.
Solution Approach 2:
The protective sleeve serves multiple functions: it protects the heating element from mechanical damage, provides structural support, and facilitates connection between the heating element and the cartridge body, thereby simplifying the overall connection structure.
3Productivity
If the heating element is exposed directly in the cartridge, then the aerosol generation efficiency is improved, but the heating element is more susceptible to damage and contamination
Solution Approach 1:
The heating element is nested within the protective sleeve, which is positioned within the cartridge. This nested arrangement protects the heating element from damage and contamination while allowing it to remain exposed enough to function effectively for aerosol generation.
Solution Approach 2:
The protective sleeve provides localized protection to the heating element where it is most vulnerable, while leaving the heating surface exposed to maintain aerosol generation efficiency. The protection is applied selectively rather than completely enclosing the element.
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
The solution ensures uniform heating and prevents re-use of the article, maintaining aerosol quality by minimizing electrical resistance and avoiding the generation of off-flavors from previously heated material.
Implementation Method 1
a rod-shaped heating element arranged within a cartridge such that the rod-shaped heating element is surrounded by the pharmaceutical composition
Data Source
Figure 1~2
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Figure 5
AI summary
An aerosol generating article ( 1 ) comprises a body of aerosol forming material (10) and a tubular inductively heatable susceptor (12) surrounding the body of aerosol forming material (10) which comprises a rolled sheet having a longitudinally extending joint (14) between opposite edges thereof The aerosol generating article (1) comprises a magnetic shielding material, preferably in the form of a magnetic shielding strip (18), extending along the longitudinally extending joint (14) so that the joint (14) is covered by the magnetic shielding strip (18) and a non-electrically conductive material (20) between the magnetic shielding strip (18) and the joint (14). Methods for manufacturing the aerosol generating article (1) and an aerosol generating system (40) are also described.