Flat Tobacco Article With Dual Gaps for Direct Heating
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Solution Overview
Problem
Flat-shaped tobacco articles face challenges in heating efficiency due to the thermal barrier effect of paper wrappers and difficulties in internal heating, which reduces the effectiveness of heat-not-burn devices.
Innovation Solution
The design of a flat-shaped tobacco article with two gaps between the substrate layer and the wrapper allows for direct heat transfer via a heating blade, enabling either conduction or convection heating, depending on gap thickness, eliminating the need for internal or external heating through the wrapper.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the tobacco portion is wrapped in paper to improve aesthetics, then the visual appeal is enhanced, but the paper acts as a thermal barrier reducing heating efficiency
Solution Approach 1:
The wrapper is segmented to create first and second gaps between the substrate layer and wrapper, allowing heating blades to access the substrate directly while maintaining wrapped structure for aesthetics
Solution Approach 2:
The gaps act as intermediaries that allow thermal contact between heating blades and substrate, bypassing the thermal barrier effect of the paper wrapper
2Use of energy by moving object
If internal heating is used to improve heating efficiency, then direct heat transfer to substrate is achieved, but the thin structure (1 mm) makes internal heating challenging
Solution Approach 1:
Instead of placing heating elements inside the thin substrate (internal heating), the solution inverts the approach by creating gaps on the outer surface to allow heating blades to contact the substrate directly from outside
3Device complexity
If external heating through the wrapper is used, then the structure remains simple, but the paper wrapper reduces heating efficiency due to thermal barrier effect
Solution Approach 1:
The wrapper is segmented to create gaps that allow heating blades to bypass the thermal barrier of the paper wrapper and heat the substrate directly, maintaining structural simplicity while improving heating efficiency
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 configuration enhances heating efficiency by allowing direct heat transfer to the substrate, providing users with the option to choose heating methods based on taste preferences or substrate properties, while maintaining a cost-effective and aesthetically appealing design.
Implementation Method 1
heating of the substrate layer by transferring heat directly from the heating blade to the substrate layer, i.e. by conduction
Implementation Method 2
heating of the substrate layer by transferring heat from the heating blade to the substrate layer through an air gap. The heating is thus performed by convection
Data Source
AI summary
A flat-shaped tobacco article configured to operate with an aerosol generating device and extending along an article axis between a mouth end and an abutting end includes a mouthpiece portion adjacent to the mouth end and a tobacco portion adjacent to the abutting end, the tobacco portion including a substrate layer forming two opposite sides, and a wrapper forming an internal surface and arranged around the substrate layer so as its internal surface forms a first gap with one of the sides of the substrate layer and a second gap with the other side of the substrate layer, each of the first gap and the second gap being adapted to receive a heating blade of the aerosol generating device.