Conductive Substrate for Joule Heating in Smoking Articles
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Solution Overview
Problem
Existing smoking articles that aim to provide the sensations of cigarette, cigar, or pipe smoking without combusting tobacco face challenges such as inconsistent flavor release and the need for external heating devices, which detract from the smoking experience.
Innovation Solution
The development of a resistive heating element integrated with a conductive substrate and aerosol precursor materials, which uses electrical energy to heat and aerosolize inhalable substances without combustion, providing a smoking article that mimics the experience of traditional smoking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If electrical energy is used to vaporize or heat volatile material, then combustion products are reduced, but flavor release consistency deteriorates
Solution Approach 1:
The patent combines the heating element and substrate into a single integrated conductive substrate that performs both heating and material delivery functions. This integration ensures consistent thermal contact and controlled vaporization, improving flavor release consistency while maintaining the non-combustion advantage.
Solution Approach 2:
The patent specifies controlling the heating temperature to range from about 200°C to about 400°C, which is sufficient to vaporize tobacco components without reaching combustion temperatures. This parameter control ensures consistent vaporization and flavor release while avoiding combustion products.
2Object-affected harmful factors
If external heating devices are used, then combustion can be avoided, but device complexity increases
Solution Approach 1:
The conductive substrate integrates multiple functions: it serves as the heating element, the structural support, and the substrate for tobacco material attachment. This eliminates the need for separate external heating devices and reduces overall system complexity.
Solution Approach 2:
The conductive substrate performs multiple functions simultaneously: electrical conduction for heating, structural support for the tobacco material, and direct contact surface for controlled vaporization. This multi-functionality simplifies the overall device design.
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
This solution allows for a consistent and controlled release of flavors and inhalable substances, eliminating the need for external heating and enhancing the smoking experience by providing a smoke-like aerosol without combustion.
Implementation Method 1
The conductive substrate may be characterized as a resistive heating element. In other words, the substrate may exhibit an electrical resistance that renders the substrate useful as a heating element.
Implementation Method 2
When the consumer draws on the smoking article, the heating element can be functional to heat and aerosolize an aerosol precursor material
Data Source
AI summary
The present invention provides a conductive substrate useful for Joule heating, such as in an electronic smoking article. Particularly, the invention provides a resistive heating element formed of a conductive substrate. The conductive substrate comprises an electrically conductive material and a carbonaceous additive, such as a binder material. The conductive substrate is carbonized in that it is subjected to calcining conditions to effectively reduce the carbonaceous additive to its carbon skeleton. It has been found that such carbonized substrate has surprisingly improved resistance properties in relation a substrate of the same formulation that is not carbonized. The carbonized substrate can include an aerosol precursor material. The formed resistive heating element can be included in an electronic smoking article to simultaneously provide resistive heating and aerosol formation with a single, unitary component.