Method of forming elongated array including arranging first heating elements symmetrically around a pin
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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, which can result in undesirable temperature increases.
Innovation Solution
A heater with a plurality of elongate heating elements arranged in an elongate array, where the middle portion is larger than the cavity of the aerosol-forming substrate, the heating end, the support end, and the heating end, allowing direct contact and efficient heating of the substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a resistance heating element is used to heat tobacco material indirectly via air, then the heating process is simpler to implement, but the heating efficiency decreases and temperature control becomes difficult
Solution Approach 1:
The patent introduces an intermediary substance (condensate or liquid) that directly contacts the heating element and transfers heat efficiently to the tobacco material. This intermediary enables direct thermal contact between the heating element and tobacco, resolving the contradiction by maintaining manufacturing simplicity while dramatically improving heating efficiency through the liquid-mediated heat transfer pathway.
2Device complexity
If indirect heating via air is used, then the device structure is simpler, but the temperature control becomes poor and overheating occurs
Solution Approach 1:
The patent changes the physical state parameter of the heat transfer medium from gas (air) to liquid (condensate), which fundamentally alters the heat transfer characteristics. The liquid phase enables superior temperature control through higher specific heat capacity and thermal conductivity, preventing overheating while maintaining relatively simple device structure.
3Productivity
If heating elements are arranged to contact the substrate directly, then heating efficiency improves, but the risk of overheating and damage increases
Solution Approach 1:
The patent applies beforehand cushioning by introducing a liquid condensate layer between the heating element and tobacco material. This liquid layer acts as a thermal buffer that conducts heat efficiently while preventing direct thermal runaway contact, thus maintaining high heating efficiency without the overheating damage risk associated with direct solid-to-solid contact.
4Reliability
If the middle portion of the heater array is larger than the substrate cavity, then good contact and condensate removal are achieved, but the heater structure becomes more complex
Solution Approach 1:
The patent employs asymmetry in the heater array design by making the middle portion larger than the support and heating ends. This asymmetric configuration optimizes the contact interface with the substrate cavity, ensuring reliable thermal contact and effective condensate removal at the critical middle section while maintaining simpler structures at the ends, thus achieving high reliability without excessive overall 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 substrate, reduces temperature requirements, and minimizes the risk of overheating by ensuring good contact and condensate removal, while maintaining a robust heater structure.
Implementation Method 1
a plurality of elongate heating elements arranged in an elongate array... The plurality of heating elements is connectable between a first voltage and a second voltage... allowing electrical current to flow through the respective heating element
Implementation Method 2
the heating elements are pressed towards each other so as to exert a force on the substrate... ensuring good contact... efficient heating of the substrate
Data Source
AI summary
The method includes forming an elongated array by arranging first heating elements symmetrically around a pin, the pin spanning across a radial centerline of the elongated array between a first end and a second end of the elongated array, a midsection of the first heating elements bowing concentrically outward from the radial centerline.