Varying Cross-Section Airflow Channels in Aerosol Cartridges
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Solution Overview
Problem
Manufacturing tolerances in the dimensions of carrier materials in aerosol-generating systems can lead to inconsistent volumetric airflow, affecting the ratio of nicotine vapor to acid vapor and resulting in an inefficient reaction stoichiometry and user experience.
Innovation Solution
The cartridge design features airflow channels defined by carrier materials with varying cross-sectional areas along the airflow path, which mitigates the effects of manufacturing tolerances and allows for more precise control of resistance and vapor ratios, ensuring efficient reaction stoichiometry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If uniform planar carrier materials are used in compartments, then manufacturing is simple, but manufacturing tolerances cause inconsistent volumetric airflow affecting vapor ratio
Solution Approach 1:
The patent applies local quality by creating non-uniform airflow channels within the carrier material. Specifically, the airflow channel has a varying cross-sectional area along its length, with a first cross-sectional area at the inlet and a second cross-sectional area at the outlet that is different from the first. This local variation in channel geometry compensates for manufacturing tolerances in carrier material dimensions, maintaining consistent volumetric airflow and vapor ratios despite variations in overall carrier material size.
Solution Approach 2:
The patent changes the geometric parameters of the airflow channel by varying its cross-sectional area along the airflow path. This parameter change allows the system to compensate for manufacturing tolerances in carrier material dimensions. By adjusting the channel cross-sectional area distribution, the volumetric airflow can be kept consistent even when carrier material dimensions vary within tolerance ranges.
2Adaptability or versatility
If carrier material dimensions vary due to manufacturing tolerances, then production flexibility is maintained, but resistance to draw and volumetric airflow become inconsistent
Solution Approach 1:
The varying cross-sectional area of the airflow channel creates local quality variations that compensate for manufacturing tolerances. The channel is designed with specific cross-sectional area changes along its length, which creates a flow resistance profile that is less sensitive to overall carrier material dimension variations, thereby maintaining consistent resistance to draw.
Solution Approach 2:
The patent applies beforehand cushioning by designing the airflow channel with pre-calculated varying cross-sectional areas that anticipate and compensate for manufacturing tolerances. The channel geometry is optimized in advance to provide a cushioning effect against dimensional variations, ensuring that resistance to draw and volumetric airflow remain consistent despite manufacturing variations.
3Manufacturing precision
If airflow channel cross-sectional area is varied along the airflow path, then volumetric airflow consistency is improved, but carrier material manufacturing complexity increases
Solution Approach 1:
The patent implements local quality by varying the cross-sectional area of the airflow channel at specific locations along the airflow path. This localized geometric variation achieves the goal of consistent volumetric airflow while potentially simplifying manufacturing compared to completely complex designs, as the variation is applied in a controlled and systematic manner within the carrier material structure.
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 enhances the consistency of nicotine salt particle formation and user experience by maintaining efficient reaction stoichiometry and reducing the delivery of unreacted nicotine and acid, thereby improving aerosol quality.
Implementation Method 1
The cross-sectional area of at least one of the first airflow channel and the second airflow channel varies in a direction along the first airflow path or the second airflow path respectively... reduces or mitigates the effect of manufacturing tolerances in the dimensions of the carrier material
Implementation Method 2
an electrical heater is used for heating a nicotine source and a volatile delivery enhancing compound... vaporised nicotine and acid react with each other in the gas phase
Implementation Method 3
vaporised nicotine and acid react with each other in the gas phase to form an aerosol of nicotine salt particles
Data Source
AI summary
A cartridge includes a first compartment having a first air inlet and outlet and containing a nicotine source comprising a first carrier material (i) impregnated with nicotine, and (ii) defining a first airflow channel extending therethrough, which defines a first airflow path extending along the first airflow channel between the first air inlet and outlet. The cartridge includes a second compartment having a second air inlet and outlet and containing an acid source comprising a second carrier material (i) impregnated with an acid, and (ii) defining a second airflow channel extending therethrough, which defines a second airflow path extending along the second airflow channel between the second air inlet and outlet. The first and second compartments are arranged in parallel within the cartridge. The cross-sectional area of at least one of the first and second airflow channels varies in a direction along the first or second airflow path.