PHA Filter Segment for Aerosol Moisture and Biodegradability
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Solution Overview
Problem
Conventional aerosol-generating articles using cellulose acetate filters often result in 'dry' smoke due to high water absorption, leading to an undesirable smoking experience, and these filters are not biodegradable, posing sustainability issues.
Innovation Solution
The use of a filter segment comprising polyhydroxyalkanoate (PHA) fibers with a denier per filament between 1.5 and 2.7, which are more biodegradable and have a lower hydrophilicity, reducing water absorption and enhancing the smoking experience by maintaining higher moisture levels in the aerosol.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cellulose acetate filter material is used, then filtration efficiency is improved, but water absorption increases causing dry smoke
Solution Approach 1:
The patent changes the material parameter from cellulose acetate to polyhydroxyalkanoate (PHA), which fundamentally alters the hydrophilicity parameter. PHA fibers have lower hydrophilicity than cellulose acetate, reducing water absorption while maintaining filtration efficiency, thus resolving the contradiction between filtration performance and smoke dryness
Solution Approach 2:
The patent uses composite fiber structures where PHA fibers are combined with other materials to create a filter that maintains both filtration efficiency and reduced water absorption. The composite approach allows optimization of both parameters simultaneously
2Reliability
If cellulose acetate filter material is used, then filtration efficiency is improved, but biodegradability worsens
Solution Approach 1:
The patent changes the material composition parameter from non-biodegradable cellulose acetate to biodegradable polyhydroxyalkanoate (PHA). This parameter change simultaneously improves biodegradability while maintaining filtration efficiency, resolving the contradiction between performance and sustainability
Solution Approach 2:
The patent employs disposable filter segments made from PHA that are designed to be biodegradable after use. This approach aligns with the disposable nature of aerosol-generating articles while improving environmental sustainability through biodegradability
3Object-affected harmful factors
If PHA filter material is used, then biodegradability is improved, but water absorption decreases causing dry smoke
Solution Approach 1:
The patent optimizes the hydrophilicity parameter of PHA fibers by controlling fiber morphology, surface treatment, or composite formulation. This parameter optimization reduces excessive water absorption while maintaining the biodegradability advantage, resolving the contradiction between sustainability and smoke moisture
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 PHA filter segment effectively reduces the 'dry smoke' issue by maintaining higher moisture levels in the aerosol and provides improved biodegradability, enhancing the sustainability of aerosol-generating articles while maintaining filtration efficiency and resistance to draw.
Implementation Method 1
which are more biodegradable and have a lower hydrophilicity, reducing water absorption
Data Source
Figure 1~2
Figure 3~4
AI summary
An aerosol-generating article (10)(100)(310) comprises: an aerosol-generating substrate (12)(114)(312); and a filter (18)(122)(314) in axial alignment with the aerosol- generating substrate, the filter (18)(122)(314) comprising at least one filter segment (126)(318) of filtration material comprising a plurality of fibres comprising a polyhydroxyalkanoate compound, wherein the fibres have a denier per filament (dpf) of between 1.5 and 3.2 and wherein the at least one filter segment comprises at least about 20 percent by weight of the polyhydroxyalkanoate compound.