Multi-Section Smoke Filter for Cooling and Low Pressure Drop
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Solution Overview
Problem
Conventional cigarette filters suffer from reduced draught, inadequate filtration performance, and inability to cool smoke effectively, especially when used with cannabis or tobacco-cannabis cigarettes, and they allow activated carbon dust inhalation.
Innovation Solution
A four-section filter design with a fourth section having a lower pressure drop than the third section, incorporating a support element and a cavity to enhance airflow and cooling, while using nonwoven and porous filter materials for targeted filtration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If activated carbon is provided as filter material, then filtration performance is improved, but activated carbon dust penetrates through holes in ceramic discs and is inhaled by smoker
Solution Approach 1:
The filter is divided into multiple sections with different filter materials: a first section with a first filter material, a second section with activated carbon, and a third section with a second filter material. This segmentation allows each section to perform specific filtration functions, preventing activated carbon dust from reaching the user while maintaining effective filtration.
Solution Approach 2:
The first and third filter materials act as intermediary barriers between the user and the activated carbon. These intermediary filter materials capture and retain activated carbon dust particles, preventing them from penetrating through to the user's lungs while still allowing smoke to pass through for cooling and flavor preservation.
2Reliability
If three-section filter with activated carbon is used, then filtration is improved, but draught through cigarette filter is severely reduced
Solution Approach 1:
Different sections of the filter have different filter materials with different filtration characteristics. The first and third sections use filter materials optimized for capturing particles, while the second section uses activated carbon for chemical filtration. This local differentiation allows effective filtration without uniformly restricting airflow, maintaining acceptable draught.
Solution Approach 2:
The filter design changes the physical parameters of different sections (material composition, pore structure, density) to optimize both filtration efficiency and airflow. By carefully selecting filter materials with appropriate pore sizes and densities in each section, the system achieves effective particle capture while maintaining sufficient airflow for comfortable smoking.
3Reliability
If three-section filter with activated carbon is used, then filtration is improved, but cooling of smoke prior to inhalation is not possible and taste is adversely affected
Solution Approach 1:
The filter is segmented into distinct functional zones: the second section with activated carbon handles chemical filtration, while the first and third sections with their specific filter materials provide physical filtration and serve as cooling zones. This segmentation allows smoke to be cooled in the first and third sections before reaching the user, preserving taste while maintaining filtration effectiveness.
4Ease of manufacture
If conventional filter design is used, then manufacturing is simple, but filtration performance is insufficient for cannabis cigarettes
Solution Approach 1:
The filter is divided into multiple sections that can be manufactured separately and then assembled. Each section uses filter materials suitable for its specific function, allowing the use of high-performance filtration materials for cannabis cigarettes while maintaining manufacturability through modular construction.
Solution Approach 2:
The filter employs composite construction with different filter materials in different sections: the first and third sections use filter materials optimized for particle filtration, while the second section uses activated carbon for chemical filtration. This composite approach provides enhanced filtration performance for cannabis cigarettes while remaining manufacturable through established filtration material technologies.
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
Improves airflow, enhances filtration performance, and cools smoke without deteriorating taste, suitable for cannabis and tobacco-cannabis cigarettes, while minimizing activated carbon dust inhalation.
Implementation Method 1
Mainly tar, nicotine and condensates are filtered out of the smoke with the first nonwoven filter material
Implementation Method 2
Mainly aromatic compounds, para-benzoquinone and carbonyl compounds (especially acetaldehydes, acetones, acrolein, crotonaldehydes, propionaldehydes) are filtered out of the smoke with the porous filter material
Implementation Method 3
The second nonwoven filter material is primarily used to filter dust (for example, activated carbon dust) carried by the flow from the porous filter material
Implementation Method 4
the fourth section is disposed in a manner such that, when a flow passes through the wrap, a pressure drop over the fourth section is smaller than a pressure drop over the third section
Data Source
AI summary
A device for filtering smoke, in particular tobacco and/or cannabis cigarette filters, comprising a jacket, in which jacket there are provided at least a first portion, a second portion and a third portion, the second portion being arranged between the first portion and the third portion, wherein in the first section a first nonwoven filter material, in the second section a porous filter material, and in the third section a second nonwoven filter material being provided in the third section; wherein a fourth section is provided in the jacket, wherein the third section is arranged between the second section and the fourth section, and wherein the fourth section is arranged such that, when flowing through the jacket, a pressure drop across the fourth section is lower than a pressure drop across the third section.