Self-Heating Smokeless Cigarette Using Supersaturated Salt Crystallization
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Solution Overview
Problem
Existing smokeless cigarettes face challenges in achieving effective and efficient heating of the nicotine reservoir and inhaled air, often requiring external heat sources or complex designs.
Innovation Solution
A smokeless cigarette with a self-sufficient heating unit containing sodium acetate trihydrate, Glauber's salt, or magnesium nitrate hexahydrate in a metastable, supersaturated form, which undergoes crystallization to release heat and warm the nicotine reservoir and inhaled air, with a user-actuable triggering mechanism to initiate crystallization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a flame or heating wire is used to heat the nicotine reservoir, then effective heating is achieved, but the device complexity increases and external power sources are required
Solution Approach 1:
The patent utilizes the phase transition of sodium acetate trihydrate from liquid to crystalline state, which releases latent heat of crystallization. This exothermic phase transition provides sustained heating of the nicotine reservoir without requiring external power sources or complex heating control systems, thereby resolving the contradiction between effective heating and device complexity
Solution Approach 2:
The heating system is self-contained and self-powered through the crystallization process of the phase change material. The system generates its own heat internally without requiring external flames, heating wires, or power sources, simplifying the overall device structure while maintaining effective heating capability
2Temperature
If a flame or heating wire is used to heat the inhaled air, then effective heating is achieved, but the device complexity increases and external power sources are required
Solution Approach 1:
The same phase transition mechanism of sodium acetate trihydrate is utilized to heat both the nicotine reservoir and the inhaled air. The crystallization process generates sufficient heat to warm the air pathway, eliminating the need for separate heating elements or power sources for air heating, thereby reducing device complexity while maintaining effective air temperature
3Temperature
If external heat sources are used, then effective heating is achieved, but the ease of operation decreases due to required external power sources
Solution Approach 1:
The heating system operates autonomously through the self-contained crystallization process of sodium acetate trihydrate. Users simply need to activate the crystallization (e.g., by shaking or clicking a mechanism), and the system self-generates and sustains the required heat without needing external flames, lighters, batteries, or power adapters, significantly improving ease of operation
4Ease of manufacture
If a simple construction is used, then manufacturing ease is improved, but effective heating of the nicotine reservoir and inhaled air becomes difficult to achieve
Solution Approach 1:
The patent employs the well-understood phase transition properties of sodium acetate trihydrate, which can be encapsulated in simple gel or pouch forms. This approach requires no complex heating elements, control circuits, or power management systems, allowing for straightforward manufacturing processes while reliably achieving the necessary heating temperatures through the exothermic crystallization process
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 design provides continuous heat for an extended period, efficiently heating the nicotine reservoir and inhaled air, enhancing nicotine release and user comfort without external heat or power, while maintaining a simple construction and minimizing direct contact with the heating unit.
Implementation Method 1
the thermal unit is designed such that it comprises a liquid containing sodium acetate trihydrate and/or Glauber's salt and/or magnesium nitrate hexahydrate which is present in the thermal unit in a metastable, supersaturated form and which upon crystallization of sodium acetate trihydrate, sodium sulfate, of the Glauber's salt and/or the magnesium nitrate hexahydrate gives off heat
Implementation Method 2
which upon crystallization of sodium acetate trihydrate, sodium sulfate, of the Glauber's salt and/or the magnesium nitrate hexahydrate gives off heat
Implementation Method 3
the cigarette also has a triggering mechanism that can be actuated by a user and that initiates the crystallization. It is provided according to the invention that the crystallization is initiated by a mechanical process
Data Source
Figure 1
Figure 2~3
AI summary
A smoke-free cigarette (10) comprises a self-sufficient heating unit (14) for producing heat and a nicotine reservoir. The nicotine reservoir includes nicotine, a nicotine-containing compound or tobacco enriched with nicotine compound. The heating unit is designed such that it has a fluid including sodium acetate trihydrate, sodium sulfate, Glauber's salt or magnesium nitrate hexahydrate. The fluid in oversaturated form emits heat during crystallization of sodium acetate trihydrate, sodium sulfate, Glauber's salt or magnesium nitrate hexahydrate. An independent claim is included for a method for filling smoke-free cigarette, which involves heating sodium acetate trihydrate, sodium sulfate, Glauber's salt or magnesium nitrate hexahydrate.