Dual-Susceptor Aerosol Substrate for Curie Temperature Control
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Solution Overview
Problem
Existing aerosol-forming substrates in inductive heating devices lack efficient control over operating temperature, leading to potential overheating and inconsistent aerosol production.
Innovation Solution
The use of a dual susceptor material system with distinct Curie-temperatures allows for separate optimization of heating efficiency and temperature control, where the second susceptor material automatically regulates heating by phase change detection, preventing overheating and ensuring consistent aerosol production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a single susceptor material is used for heating the aerosol-forming substrate, then heating efficiency can be optimized, but temperature control becomes difficult and may lead to overheating
Solution Approach 1:
The susceptor material is segmented into two distinct components: a first susceptor material optimized for heating efficiency with higher Curie-temperature, and a second susceptor material optimized for temperature control with lower Curie-temperature. This segmentation allows each material to perform its specific function independently, resolving the contradiction between heating efficiency and temperature control.
Solution Approach 2:
Different regions of the susceptor system are assigned different material properties. The first susceptor material has properties tailored for maximum heating efficiency, while the second susceptor material has properties tailored for temperature regulation. This local differentiation of material qualities enables simultaneous optimization of both heating and temperature control functions.
2Power
If the Curie-temperature of the susceptor material is set high for efficient heating, then heating performance improves, but the risk of overheating and local burning increases
Solution Approach 1:
The potentially harmful effect of high Curie-temperature causing overheating is converted into a beneficial temperature control mechanism. The second susceptor material with lower Curie-temperature acts as a safety mechanism that automatically limits the maximum temperature, transforming what would be a harmful side effect into a useful temperature regulation feature.
Solution Approach 2:
The second susceptor material with lower Curie-temperature serves as a pre-established protective layer that prevents overheating before it can occur. By having this temperature-limiting mechanism in place beforehand, the system is cushioned against the harmful effects of excessive heating.
3Measurement precision
If additional temperature control mechanisms are added to the inductive heating device, then temperature control precision improves, but device complexity increases
Solution Approach 1:
The temperature control function is achieved through the inherent magnetic properties of the second susceptor material, which automatically changes at its Curie-temperature. This self-regulating mechanism eliminates the need for additional temperature sensors, control circuits, or feedback systems, maintaining device simplicity while achieving precise temperature control.
Solution Approach 2:
The second susceptor material utilizes its Curie-temperature phase transition from ferromagnetic to paramagnetic state as the temperature control mechanism. This natural phase change provides automatic temperature regulation without requiring additional control systems, resolving the contradiction between control precision and device 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
This approach enables precise temperature control without additional circuitry, maintaining optimal operating temperatures and enhancing aerosol quality through efficient heating and temperature regulation.
Implementation Method 1
The inductive heating device comprises an induction source which produces an alternating electromagnetic field which induces a heat generating eddy current in a susceptor material
Implementation Method 2
induces a heat generating eddy current in a susceptor material
Implementation Method 3
The second susceptor material has a second Curie-temperature which is lower than a first Curie-temperature of the first susceptor material. At the second Curie-temperature the second susceptor material reversibly changes from a ferromagnetic phase to a paramagnetic phase
Implementation Method 4
The heated susceptor material in turn heats the aerosol-forming substrate
Data Source
AI summary
There is described an aerosol-forming substrate for use in combination with an inductive heating device. The aerosol-forming substrate comprises a solid material which is capable of releasing volatile compounds that can form an aerosol upon heating of the aerosol-forming substrate and at least a first susceptor material for heating the aerosol-forming substrate. The at least first susceptor material is arranged in thermal proximity of the solid material. The aerosol-forming substrate further comprises at least a second susceptor material which has a second Curie-temperature which is lower than a first Curie-temperature of the first susceptor material. The second Curie-temperature of the second susceptor material corresponds to a predefined maximum heating temperature of the first susceptor material. There is also described an aerosol-delivery system.