Temperature-Switchable Material Coating for Aerosol Pod Leakage Prevention
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Solution Overview
Problem
Conventional aerosol-generating devices, such as e-cigarettes, face issues with e-liquid leakage during storage and transit due to the permeation of the wicking material, which existing solutions like hot-melt sealing and barrier layers cannot prevent once the device is used, leading to leakage during long periods of non-use.
Innovation Solution
Incorporating a temperature-switchable material that coats the porous wick, which is impermeable below its transition temperature, preventing leakage during storage and transit, and becomes permeable when heated, allowing e-liquid to flow to the heating element for vaporization, and returns to an impermeable state when cooled.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a porous wick is used to supply e-liquid to the heating element, then the e-liquid flow is sufficient to avoid dry puffs, but the e-liquid permeates through the wicking material during storage and transit causing leakage
Solution Approach 1:
A temperature-switchable material is introduced as an intermediary between the e-liquid reservoir and the porous wick. This material acts as a controllable gatekeeper that blocks e-liquid at low temperatures (preventing leakage during storage) and opens at high temperatures (allowing flow during use). The material mediates the conflict between maintaining flow reliability and preventing unwanted permeation.
Solution Approach 2:
The invention changes the temperature parameter of the wicking system by introducing a temperature-switchable material with a specific transition temperature (e.g., 40-60°C). Below this temperature, the material is hydrophobic and impermeable; above it, the material becomes hydrophilic and permeable. This parameter change allows the same material to serve dual functions: blocking during storage and enabling flow during operation.
2Object-generated harmful factors
If a hot-melt sealing structure is used to seal the e-liquid flowing channel, then leakage is prevented before first use, but the sealing structure cannot reseal after being melted during use
Solution Approach 1:
The invention replaces the static hot-melt sealing structure with a dynamic temperature-switchable material that can reversibly change its state. Unlike the one-time-use hot-melt seal, this material dynamically adapts to temperature changes, switching between sealed and open states repeatedly. The material's properties change with temperature cycles, allowing it to function as a reusable, reversible sealing mechanism.
Solution Approach 2:
The temperature-switchable material utilizes phase transitions (specifically, hydrophobic to hydrophilic transition) in response to temperature changes. During storage at low temperature, the material remains in a hydrophobic phase that blocks e-liquid. During use, heating triggers a phase transition to a hydrophilic phase that allows e-liquid passage. This phase transition mechanism enables repeated sealing and opening cycles.
3Object-generated harmful factors
If a barrier layer is disposed in the liquid flow channel to prevent premature transfer, then leakage is prevented before first use, but the barrier layer degrades and cannot reseal during long periods of non-use
Solution Approach 1:
The temperature-switchable material serves itself by automatically responding to temperature changes without external control. When the device is heated during use, the material self-activates to allow e-liquid flow. When cooled during storage, it self-closes to prevent leakage. This self-service capability eliminates the need for mechanical valves or external sealing mechanisms, making the system both simpler and more reliable over extended periods.
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 effectively prevents e-liquid leakage both before and after the first use of the device, ensuring reliable operation and reduced waste by maintaining a sealed state during non-use periods and allowing efficient vaporization when in use.
Implementation Method 1
a temperature-switchable material, which coats or forms a porous wick and is arranged so that a discharge opening of a reservoir including the e-liquid is sealed. Below its transition temperature and before being heated, the temperature-switchable material is impermeable for the e-liquid... When in use, the temperature-switchable material is heated up to its transition temperature at which it becomes permeable for the e-liquid
Implementation Method 2
The e-liquid can be volatized using the heater... When in use, the temperature-switchable material is heated up to its transition temperature... allowing the e-liquid to be supplied to the heating element and vaporized
Implementation Method 3
a porous wick, which is coated with a temperature-switchable material... The flow of e-liquid through the wicking material in e-cigarettes must be sufficient to avoid dry puffs
Data Source
AI summary
A pod includes a temperature-switchable material for an aerosol-generating device, a porous wick and a reservoir including a discharge opening for an aerosol-generating liquid material, wherein (i) the porous wick is coated with a temperature-switchable material on a surface of the porous wick sealing the discharge opening of the reservoir; or (ii) the porous wick is coated with a temperature-switchable material on a surface of the porous wick opposite of the surface of the porous wick sealing the discharge opening; or (iii) the porous wick is made of the temperature-switchable material and is arranged so that a surface of the porous wick seals the discharge opening of the reservoir. The temperature-switchable material is an amphiphilic material impermeable for an aerosol-generating liquid material below a transition temperature of between 25° C. and 300° C. and becoming permeable for an aerosol-generating liquid material when exposed to a temperature above the transition temperature.