Extended Heater Assembly for Localized Aerosol Substrate Heating
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Solution Overview
Problem
Existing heating assemblies for aerosol-generating devices face challenges in meeting requirements for small size, robustness, low manufacturing cost, and effective localization of heat, particularly when used with aerosol-forming substrates that require localized heating and protection from flame ignition.
Innovation Solution
A heating assembly with a heater comprising an electrically resistive heating element and a heater mount, where the heating element has a first portion heated to a higher temperature and a second portion extending along a greater length, supported by a heater mount made from a mouldable polymeric material, providing structural support and localized heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a heater is inserted into a solid aerosol-forming substrate for direct heating, then heating efficiency is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The heating element is divided into two distinct portions: a first portion positioned on the heating area for direct substrate contact and heating, and a second portion extending into the holding area for mechanical support. This segmentation allows the heating function and support function to be separated spatialally, improving heating efficiency while maintaining structural simplicity through functional differentiation.
2Strength
If the heating element is made longer for better support, then mechanical strength is improved, but heat localization capability deteriorates
Solution Approach 1:
The heating element exhibits local quality differentiation through its two portions: the first portion has properties optimized for heat generation and transfer to the substrate, while the second portion has properties optimized for mechanical support and positioning. This local quality variation allows the element to provide both structural strength and precise heat localization without compromise.
3Stability of the object's composition
If a heater mount is added to support the heating element, then structural stability is improved, but manufacturing cost increases
Solution Approach 1:
The heater mount integrates multiple functions into a single component: it provides mechanical support for the heating element, positions the element within the device housing, and may serve as part of the thermal management structure. This merging of functions reduces the total number of parts, simplifying assembly and reducing manufacturing cost while maintaining structural stability.
4Reliability
If the second portion of the heating element is extended for better support, then mechanical robustness is improved, but heat loss to non-heating areas increases
Solution Approach 1:
The second portion of the heating element acts as an intermediary between the heat-generating first portion and the surrounding structure. It provides the necessary mechanical connection and positioning while its design (material properties, dimensions, positioning) is optimized to minimize thermal conduction to non-heating areas, thus serving as a thermal bridge that is mechanically essential but thermally controlled.
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 efficient and localized heating of aerosol-forming substrates while preventing flame ignition, maintaining robustness and reducing manufacturing costs, with the heater mount securely fixing the heating element within the device.
Implementation Method 1
the electrically resistive heating element comprises a first portion and a second portion configured such that, when an electrical current is passed through the heating element the first portion is heated to a higher temperature than the second portion
Data Source
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AI summary
A heating assembly for heating an aerosol-forming substrate, comprises a heater (14) comprising an electrically resistive heating element (82) and a heater substrate (81); and a heater mount (26) coupled to the heater (14). The electrically resistive heating element (82) comprises a first portion (84) and a second portion (86) configured such that, when an electrical current is passed through the heating element (82) the first portion (84) is heated to a higher temperature than the second portion (86). The first portion (84) of the heating element (82) is positioned on a heating area (91) of the heater substrate (81) and the second portion (86) of the heating element (82) is positioned on a holding area (93) of the heater substrate (81), the heater mount (26) being fixed to the holding area (93) of the heater substrate (81). The second portion (86) of the electrically resistive heating element (82) is longer than the first portion (84) of the heating element (82), which allows the heating element (82) to penetrate an aerosol-forming substrate located within an aerosol-forming article.