Dual Filter Smoking Article with Segmented Ventilation
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Solution Overview
Problem
Existing smoking articles with dual filters often suffer from unpleasant air dilution due to ventilation holes that reduce the filtration efficiency and aesthetic appeal, as the flutes at the mouth-sided filter region act as channels for ambient air, diluting tobacco smoke.
Innovation Solution
A smoking article design featuring a dual filter with a mouth-sided filter section having flutes only at one lateral area and ventilation holes at the other, preventing air dilution and maintaining filtration efficiency by directing ambient air through the filtering material and porous inner wrapper, while the rod-sided filter section lacks additional ventilation holes to enhance adsorbent performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If ventilation holes are provided at the mouth-sided filter section to vent the flutes, then the flutes can communicate with ambient air, but this causes air dilution of tobacco smoke and reduces filtration efficiency
Solution Approach 1:
The lateral area of the mouth-sided filter section is divided into two distinct zones: a first lateral area containing the flutes without ventilation holes, and a second lateral area containing ventilation holes without flutes. This segmentation allows the flutes to maintain structural integrity for aesthetic purposes while ventilation holes provide controlled air intake away from the flute channels, preventing unwanted air dilution.
Solution Approach 2:
Different regions of the mouth-sided filter section are assigned different functions: the first lateral area with flutes provides distinctive appearance and structural support, while the second lateral area with ventilation holes provides controlled air intake. This local differentiation ensures that ventilation occurs through designated areas rather than through the flute channels, maintaining both aesthetic appeal and filtration efficiency.
2Shape
If flutes are arranged at the first lateral area of the mouth-sided filter section for distinctive appearance, then aesthetic appeal is improved, but if ventilation holes are added at the same area, filtration efficiency deteriorates
Solution Approach 1:
The lateral surface is segmented into two functional zones: the first lateral area contains only flutes for aesthetic purposes, while the second lateral area contains only ventilation holes for air intake. This spatial separation ensures that the aesthetic flutes do not serve as unintended ventilation channels, preserving filtration efficiency while maintaining visual appeal.
Solution Approach 2:
The first lateral area is designed with flute structures to provide distinctive appearance, while the second lateral area is designed with ventilation holes to provide controlled air intake. Each zone has optimized local properties for its specific function, preventing the aesthetic flutes from compromising filtration performance.
3Productivity
If the rod-sided filter section includes additional ventilation holes, then air flow is increased, but adsorbent performance is reduced due to decreased contact time
Solution Approach 1:
Ventilation holes are extracted from the rod-sided filter section entirely, removing the source of excessive air flow that would reduce adsorbent contact time. The ventilation function is instead provided at the mouth-sided filter section, allowing the rod-sided adsorbent to function optimally without competing air flow paths.
Solution Approach 2:
By placing ventilation holes at the mouth-sided filter section rather than the rod-sided section, the design preemptively prevents air dilution from occurring at the adsorbent zone. This preliminary positioning of ventilation away from the adsorbent protects the adsorption process from being compromised by excessive air flow.
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 design provides a distinctive appearance and improved filtration and gas phase-reducing performance without air dilution, maintaining filtration efficiency and adsorbent effectiveness by directing ambient air through the filtering material and porous inner wrapper, ensuring that smoke is filtered without further dilution.
Implementation Method 1
The rod-sided filter section includes cellulose acetate and activated carbon as an adsorbent
Implementation Method 2
the rod-sided filter section includes cellulose acetate and activated carbon as an adsorbent
Implementation Method 3
directing ambient air through the filtering material and porous inner wrapper
Data Source
Figure 1
AI summary
A smoking article (1) comprises a smokable rod (2) and a dual filter (4) including a rod-sided filter section (6) comprising a filtering material and an adsorbent as well as a mouth-sided filter section (8). The mouth-sided filter section (8) has a mouth-sided first end (12) and a second end (13), has a first lateral area (16) starting at the first end (12) and a second lateral area (17) ending at the second end (13), and comprises a filtering material (10). A plurality of flutes (20) is arranged at the first lateral area (16) only, which extend from the first end (12) and run generally longitudinally. A plurality of ventilation holes (32) is arranged at the second lateral area (17). The flutes (20) are not vented by ventilation holes arranged at the first lateral area (16).