Hollow Bore Filter Element for Gentler Flavour Delivery
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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 function in smoking substitute systems, which aim to reduce health risks associated with traditional tobacco smoking by heating tobacco instead of burning it.
Innovation Solution
The design incorporates a flavoured filter element with a hollow bore, allowing for a gentler flavour delivery, and optional features such as upstream and terminal filter elements made of cellulose acetate tow, activated charcoal, or extruded plant material, with flavourants like menthol, liquorice, or tobacco, and an aerosol-forming substrate containing nicotine and humectants like propylene glycol, to enhance the vapour experience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a solid filter element is used in HNB consumables, then the structure is simple and manufacturing is easy, but the flavour delivery is strong and may be too harsh for users
Solution Approach 1:
The patent employs a hollow bore filter element with controlled porosity and internal structure. The hollow bore allows a portion of the vapour to pass through unflavoured while the outer surface provides flavourant contact, creating a gentler flavour delivery that resolves the contradiction between structural simplicity and operational gentleness.
Solution Approach 2:
The hollow bore acts as an intermediary structure between the flavourant source and the user's lungs. It allows selective vapour passage, mediating the flavour delivery to be gentler while maintaining structural integrity, thus resolving the contradiction between simplicity and operational characteristics.
2Object-affected harmful factors
If flavourant is applied to the entire filter element surface, then flavour delivery is maximized, but harmful compounds may be enhanced in the aerosol
Solution Approach 1:
The patent applies flavourant locally to the outer surface of the hollow bore filter element rather than throughout the entire element. This localized application provides sufficient flavourant for pleasant vapour while avoiding excessive flavourant that could generate harmful compounds, thus resolving the contradiction between flavour quantity and harmful factor reduction.
Solution Approach 2:
The invention extracts the flavourant application from the entire filter element structure and concentrates it on the outer surface of the hollow bore. This extraction allows flavourant to be applied only where it contacts the vapour, maximizing flavour delivery while minimizing harmful compound generation from excessive flavourant.
3Ease of operation
If a hollow bore filter element is used, then flavour delivery is gentler and user experience is improved, but manufacturing complexity increases
Solution Approach 1:
The hollow bore filter element utilizes controlled porosity and standard filtration material structures that can be manufactured using existing techniques. The hollow bore design provides gentler flavour delivery and improved user experience while remaining compatible with conventional manufacturing processes, thus resolving the contradiction between ease of operation and ease of manufacture.
4Quantity of substance
If flavourant is deposited on the filter element, then aerosol flavour is enhanced, but the filter element may become clogged with flavourant residue
Solution Approach 1:
The hollow bore structure provides a controlled porous surface for flavourant deposition. The porous nature allows flavourant to be applied to the outer surface where it can be carried away by vapour flow, preventing clogging while maintaining consistent flavour delivery and reliability over time.
Solution Approach 2:
The hollow bore acts as an intermediary structure that separates the flavourant source from the vapour flow path. flavourant is applied to the outer surface which contacts the vapour, creating a mediator effect that enhances flavour without causing direct clogging of the internal vapour passage, thus maintaining reliability.
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 solution provides a modified taste vapour experience with a milder flavour hit and improved aerosol formation, enhancing user satisfaction while reducing harmful compound exposure, thus addressing the limitations of existing HNB systems.
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 vapour
Implementation Method 2
The vapour may contain nicotine and/or flavourings. In the HNB approach the intention is that the tobacco is heated but not burned, i.e. the tobacco does not undergo combustion
Implementation Method 3
As the vapour passes through the consumable (entrained in the airflow) from an inlet to a mouthpiece (outlet), the vapour cools and condenses to form an aerosol for inhalation by the user
Implementation Method 4
The at least one hollow bore filter element may have a flavourant additive. The hollow bore allows some vapour to pass through unflavoured thus allowing a gentler 'hit' of flavourant
Implementation Method 5
The released vapour may be entrained in the airflow drawn through the tobacco. As the vapour passes through the consumable (entrained in the airflow) from an inlet to a mouthpiece (outlet)
Data Source
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AI summary
The present disclosure relates to an aerosol-forming article (1) comprising an aerosol-forming substrate (2) and at least one hollow bore filter element (5) downstream from the aerosol-forming substrate. The at least one hollow bore filter element comprises a flavourant additive e.g. menthol.