High-Emissivity Coloured Wrapper for Heat-Not-Burn Aerosol Generation
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Solution Overview
Problem
The wrapper in heat-not-burn aerosol generating devices creates a thermal barrier that reduces the efficiency of heat transfer to the tobacco substrate, leading to insufficient vapor production.
Innovation Solution
A tobacco article with a wrapper external surface that has an emissivity value higher than 0.85, preferably between 0.90 and 0.98, is used to enhance heat absorption through thermal radiation, conduction, and convection, improving the heating of the tobacco substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wrapper is used to preserve tobacco substrate integrity and prevent vapor leakage, then product reliability is improved, but heat transfer efficiency deteriorates due to thermal barrier
Solution Approach 1:
The patent changes the optical parameter (emissivity) of the wrapper material by applying a colored coating with high infrared emissivity (>0.85). This parameter change enables the wrapper to absorb thermal radiation more effectively while maintaining its protective function, thus resolving the contradiction between reliability and heat transfer efficiency
Solution Approach 2:
The patent creates a composite structure consisting of the base wrapper material combined with a colored coating layer. This composite material combines the protective properties of the wrapper with the high heat absorption properties of the colored coating, simultaneously achieving both reliability and improved heat transfer
2Ease of operation
If a wrapper is used to ensure clean handling and controlled vapor path, then ease of operation is improved, but vapor production efficiency deteriorates due to reduced heat transfer
Solution Approach 1:
By changing the emissivity parameter of the wrapper surface through colored coating, the system enhances heat absorption capability without affecting the wrapper's protective function. This resolves the contradiction between ease of operation and vapor production efficiency
Solution Approach 2:
The patent converts the previously harmful thermal barrier effect of the wrapper into a beneficial heat absorption mechanism. The colored coating transforms the wrapper from a heat-blocking element into a heat-absorbing element that actively contributes to vaporization, thus converting the harm into benefit
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
The colored wrapper optimizes heat absorption, enhancing vapor production efficiency by absorbing a wider range of wavelengths and minimizing vapor leakage, resulting in improved aerosol generation.
Implementation Method 1
the wrapper external surface is at least partially coloured so as its emissivity value for infrared thermometer readings is higher than 0.85... the wrapper external surface is coloured so as to enhance heat absorption from the or each heating element. Thus, it is possible to improve the heating of the tobacco substrate by absorbing heat from the device's heater(s), via thermal radiation
Implementation Method 2
A thermal conduction between the device's heater(s) and the tobacco substrate is obtained if the tobacco substrate and/or wrapper is in contact with the device's heater(s)
Implementation Method 3
A thermal convection between the device's heater(s) and the tobacco substrate is obtained when the tobacco substrate is generally distant from the device's heater(s). When being powered, the temperature of the device's heater(s) increases, thus producing an airflow between the device's heater(s) and the tobacco substrate. Such airflow thus transfers energy to the tobacco substrate
Data Source
AI summary
A tobacco article for a heat-not-burn aerosol generating device. The aerosol generating device may include one or several heating elements. The tobacco article—may include a tobacco substrate portion, and wrapper wrapping the tobacco substrate portion and defining a wrapper external surface intended to be in contact or face at least partially each heating element. The wrapper's external surface is at least partially coloured by a colour such that an emissivity value for an infrared thermometer readings is higher than 0.85.