HNB Consumable Filter With Radial Bores for Lower Draw Resistance
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Solution Overview
Problem
There is a need for improved design of Heat-Not-Burn (HNB) consumables to enhance user experience and improve nicotine delivery, Total Particulate Matter (TPM) delivery, flavor delivery, and airflow delivery.
Innovation Solution
The design incorporates a filter segment with a plurality of bores extending through it, which allows airflow to pass through the bores rather than a filter tow, reducing draw resistance and enhancing vapor and nicotine delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a filter tow is used to prevent debris from entering the user's mouth, then filtration effectiveness is improved, but draw resistance increases and airflow delivery is reduced
Solution Approach 1:
The patent employs a porous filter segment with controlled porosity (5-20%) that allows airflow through the filter media itself rather than forcing air through a dense filter tow. The porous structure provides filtration while maintaining low draw resistance, resolving the contradiction between filtration effectiveness and ease of operation.
Solution Approach 2:
The filter assembly is segmented into distinct functional zones: a filter segment for debris removal, a cooling segment for vapor condensation, and an aerosol-forming substrate. This segmentation allows each component to optimize its specific function without compromising overall airflow, reducing total draw resistance while maintaining filtration effectiveness.
2Quantity of substance
If the aerosol-forming substrate is heated to generate vapor, then nicotine and flavor delivery are improved, but vapor condensation in the filter increases
Solution Approach 1:
The cooling segment is positioned upstream of the filter segment to pre-cool and condense vapor before it reaches the filter. This preliminary cooling action prevents excessive vapor condensation in the filter by removing moisture earlier in the airflow path, thereby reducing substance loss while maintaining nicotine delivery.
Solution Approach 2:
The cooling segment acts as an intermediary between the heated aerosol-forming substrate and the filter segment. It mediates the temperature and moisture levels, allowing vapor to be partially condensed and cooled before entering the filter, thus reducing vapor loss in the filter while preserving nicotine delivery to the user.
3Ease of operation
If the filter segment has high porosity to reduce draw resistance, then airflow delivery is improved, but filtration effectiveness decreases
Solution Approach 1:
The filter segment uses porous material with optimized porosity (5-20%) that balances airflow permeability and filtration capability. The porous structure allows sufficient air passage while the pore size and distribution are controlled to maintain effective debris filtration, resolving the contradiction between airflow delivery and filtration effectiveness.
Solution Approach 2:
The patent optimizes key parameters of the filter segment including porosity (5-20%), pore size, and thickness to achieve the desired balance between airflow delivery and filtration effectiveness. By carefully controlling these parameters, the filter provides low draw resistance while maintaining reliable debris removal capability.
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 improved airflow, reduced vapor condensation, and enhanced mixing of nicotine and vapor, resulting in a more comfortable and effective user experience.
Implementation Method 1
heat may be imparted to the tobacco material by a heating element of the device, wherein airflow through the tobacco material causes moisture in the tobacco material to be released as vapor
Implementation Method 2
the vapor cools and condenses to form an aerosol for inhalation by the user
Data Source
AI summary
An aerosol-forming article is disclosed having an improved filter at its axial downstream end, for instance a mouthpiece end. The improved filter comprises a filter segment having a plurality of bores extending there through, wherein a cooling segment is arranged upstream of the filter segment, the cooling segment comprising portion having a central bore that forms a central region extending around a central axis of the aerosol-forming article and a center of each bore of the plurality of bores is arranged radially outside of the central region.