Method or forming elongated array with heating elements that bow concentrically outward from radial centerline
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Solution Overview
Problem
Existing smoking articles with resistance heating elements heat tobacco material indirectly, 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 larger dimension than the support and heating ends, allowing direct contact with the aerosol-forming substrate, and includes a conductive pin for voltage connection and individual or common control switches.
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 decreases and temperature control becomes difficult
Solution Approach 1:
The patent introduces a porous support structure as an intermediary medium between the heating element and tobacco material. The heating element is embedded in this porous support, which allows direct thermal contact with tobacco while maintaining structural separation. This mediator enables efficient heat transfer to tobacco material and facilitates condensate removal through the porous structure, resolving the contradiction between heating efficiency and temperature control.
2Reliability
If the heating element is embedded in porous support, then direct contact with substrate is achieved, but manufacturing complexity increases
Solution Approach 1:
The heating element is pre-embedded in the porous support structure during manufacturing, creating a pre-assembled unit. This preliminary action ensures proper positioning and contact between the heating element and porous support before the entire assembly is inserted into the tobacco material. This approach maintains heating efficiency while simplifying the final assembly process, as the pre-assembled unit requires only insertion rather than on-site assembly of multiple components.
3Reliability
If multiple heating elements are used in array, then heating uniformity improves, but device complexity increases
Solution Approach 1:
The patent combines multiple heating elements into a single integrated array structure embedded in the porous support. Rather than controlling each heating element independently, they function as a unified heating system. This merging approach maintains heating uniformity across the tobacco material while reducing control complexity, as the entire array can be controlled through a single power supply connection rather than multiple independent control circuits.
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 overheating by ensuring direct contact and effective condensate removal, while maintaining robustness and flexibility in heating control.
Implementation Method 1
a plurality of elongate heating elements arranged in an elongate array... the array arranged to heat the substrate to form an aerosol
Data Source
AI summary
The method includes forming an elongated array by first connecting first distal ends of first heating elements to each other to form a first end of the elongated array, and second connecting second distal ends of the first heating elements to each other to form a second end of the elongated array, a midsection of the first heating elements of the elongated array bowing concentrically outward from a radial centerline running longitudinally through the first end and the second end.