Heater Assembly Pierced Transport Material for Aerosol Systems
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Solution Overview
Problem
Existing aerosol-generating systems face issues with 'dry puff' situations due to insufficient liquid aerosol-forming substrate reaching the heating element, leading to overheating and potential thermal decomposition, which produces undesirable by-products like formaldehyde.
Innovation Solution
The introduction of a transport material with at least one hole extending into the material, creating a formed fluid channel, ensures that liquid aerosol-forming substrate can freely reach the fluid-permeable heating element, even when the transport material is compressed, thereby reducing the likelihood of dry puff situations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transport material is compressed to ensure a tight fit in the housing, then the seal and structural stability are improved, but the liquid transport capability deteriorates due to closure of pores or micro-channels
Solution Approach 1:
The transport material is segmented into two functional zones: a peripheral sealing region that compresses against the housing to provide a tight seal, and a central region containing formed fluid channels that remain open to maintain liquid transport capability. This segmentation allows different parts of the same component to fulfill conflicting functions simultaneously.
Solution Approach 2:
Different regions of the transport material are given different structural properties: the peripheral region is designed to compress and seal, while the central region maintains open channels for liquid flow. The formed fluid channels are strategically located to ensure liquid transport is not compromised by the compression applied to achieve sealing.
2Quantity of substance
If the transport material thickness is increased to improve liquid retention, then the liquid supply capacity is improved, but the heating efficiency deteriorates due to longer transport path
Solution Approach 1:
Instead of relying solely on radial transport through the thickness of the material, the invention introduces formed fluid channels that create a direct vertical pathway from the liquid supply to the heating element. This dimensional change in fluid transport path allows the transport material to be thicker for better retention while maintaining efficient liquid delivery through the channels.
Solution Approach 2:
The formed fluid channels act as intermediaries that bridge the gap between the liquid supply and the heating element, providing a dedicated transport route that bypasses the limitations of capillary action through the bulk material. This intermediary structure enables both thick material for retention and efficient liquid delivery.
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 results in a significant reduction in formaldehyde production, with a 90% decrease compared to systems without the formed fluid channel, ensuring efficient vaporization and minimizing undesirable by-products.
Implementation Method 1
a transport material configured to transport liquid aerosol-forming substrate to the fluid-permeable heating element
Implementation Method 2
a fluid-permeable heating element configured to vaporise a liquid aerosol-forming substrate by heating to generate an aerosol
Data Source
AI summary
A heater assembly for an aerosol-generating system is provided, the heater assembly including: a fluid-permeable heating element configured to vaporise a liquid aerosol-forming substrate; and a transport material configured to transport liquid aerosol-forming substrate to the fluid-permeable heating element, the transport material having a thickness defined between a first surface of the transport material and an opposing second surface of the transport material, the first surface being arranged in fluid communication with the fluid-permeable heating element and the second surface being arranged to receive liquid aerosol-forming substrate, the second surface of the transport material being provided with at least one hole that extends into the transport material to a depth corresponding to at least a part of the thickness of the transport material to define a formed fluid channel for the liquid aerosol-forming substrate, and the first surface of the transport material being convex.