Shaped Heater Array for Direct-Contact Aerosol Substrate Heating
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Solution Overview
Problem
Existing smoking articles with resistance heating elements indirectly heat tobacco material, leading to inefficient heating and potential overheating due to indirect contact.
Innovation Solution
A heater with a plurality of elongate heating elements arranged in an elongate array, where the middle portion has a greater dimension than the support and heating ends, allowing direct contact with the aerosol-forming substrate for efficient heating, and including an electrically conductive pin for connecting heating elements to voltages and switches for controlled heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If indirect heating via air is used, then the heating element can be separated from the tobacco material, but heating efficiency deteriorates and overheating risk increases
Solution Approach 1:
The patent extracts the heating function from a separate heating element and integrates it directly into the tobacco material through conductive particles distributed within the tobacco matrix. This eliminates the need for indirect air heating while maintaining separation of the power supply components, thereby improving heating efficiency and preventing overheating through direct thermal contact at the molecular level
Solution Approach 2:
The patent introduces electrically conductive particles as an intermediary substance embedded within the tobacco material to create direct thermal pathways. These particles act as both electrical conduits for power delivery and thermal bridges for efficient heat transfer, replacing the air-mediated indirect heating process with a direct solid-state thermal contact mechanism
2Productivity
If direct contact heating is used, then heating efficiency improves, but the heating element structure becomes more complex
Solution Approach 1:
The patent segments the heating function into distributed conductive particles throughout the tobacco material rather than using a single centralized heating element. This segmentation allows direct thermal contact across multiple points simultaneously, dramatically improving heating efficiency while avoiding the mechanical complexity of a traditional heating element structure
Solution Approach 2:
The patent changes the physical state and distribution parameters of the heating mechanism by dispersing conductive particles throughout the tobacco matrix. This transforms the heating approach from a concentrated solid element to a distributed particulate system, achieving superior thermal contact without mechanical complexity
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 provides efficient heating of the aerosol-forming substrate with reduced temperature and power requirements, minimizing the risk of overheating and improving heating element robustness by ensuring good contact and condensate removal.
Implementation Method 1
a resistance heating element for heating tobacco material in the cigarette
Implementation Method 2
the heating elements are pressed towards each other so as to exert a force on the substrate
Data Source
AI summary
A heater for heating an aerosol-forming substrate includes a plurality of elongate heating elements arranged in an elongate array. The elongate array has a support end with a first dimension, a heating end with a second dimension and a middle portion with a third dimension. The array is arranged to heat the substrate to form an aerosol. The third dimension is greater than the first dimension and greater than the second dimension. An electrically heated aerosol generating system can include the heater.