Biodegradable Dual-Filter Smoking Article Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Biodegradable filter materials for smoking articles with improved filtration efficiency for particulate matter lead to increased carbon monoxide yields, exceeding regulatory limits, and existing solutions do not maintain a white filter appearance or handle filtration efficiency effectively like cellulose acetate filters.
Innovation Solution
A dual filter smoking article design featuring a first segment with cut or shredded plant material and a second segment made of natural or regenerated cellulose, ensuring biodegradability and a white appearance, with the cellulose segment's length and material controlling filtration efficiency to meet regulatory CO/PMWNF ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If biodegradable filter materials with improved filtration efficiency are used, then particulate matter filtration is improved, but carbon monoxide yield increases exceeding regulatory limits
Solution Approach 1:
The filter is divided into multiple segments with different functions: a first segment with low filtration efficiency to maintain CO/PMWNF ratio compliance, and a second segment with high filtration efficiency to reduce particulate matter. This segmentation allows each segment to perform its specific function without compromising the overall balance required by regulations.
Solution Approach 2:
Different segments of the filter are assigned different local qualities - the first segment has properties optimized for maintaining gas phase composition (low filtration efficiency), while the second segment has properties optimized for particulate matter removal (high filtration efficiency). This local differentiation resolves the contradiction by allowing each region to excel at its specific task.
2Reliability
If biodegradable filter materials are used, then environmental biodegradability is improved, but filter appearance deviates from consumer preference for white colour
Solution Approach 1:
The filter is segmented such that the second segment, which provides the visible white appearance at the mouth end, is made of cellulose material that satisfies consumer aesthetic preferences. The first segment, which is less visible, uses biodegradable plant material that ensures environmental degradability. This segmentation allows both appearance and biodegradability requirements to be met simultaneously.
Solution Approach 2:
The mouth-sided portion of the filter (second segment) is given the local quality of white cellulose material to satisfy consumer appearance preferences, while other portions use biodegradable materials. This local quality assignment ensures that the most visible area meets aesthetic requirements while the overall filter maintains biodegradability.
3Object-affected harmful factors
If higher filtration efficiency is used, then particulate matter yield is reduced, but carbon monoxide to particulate matter ratio increases
Solution Approach 1:
The filter is segmented into a first segment designed to minimize particulate matter removal (maintaining low filtration efficiency) and a second segment designed for high particulate matter removal. By carefully controlling the length and properties of each segment, the overall filter achieves high PMWNF reduction while the first segment ensures sufficient CO transmission to maintain compliant CO/PMWNF ratios.
Solution Approach 2:
The filtration efficiency parameter is differentiated across segments - the first segment operates at low filtration efficiency to maintain gas phase composition and CO/PMWNF ratio, while the second segment operates at high filtration efficiency for particulate matter removal. This parameter differentiation across segments resolves the contradiction between PMWNF reduction and CO/PMWNF ratio maintenance.
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 dual filter configuration maintains a low filtration efficiency for particulate matter, adhering to regulatory CO/PMWNF ratios and providing a biodegradable, aesthetically acceptable solution that resembles cellulose acetate filters while influencing taste and handling.
Implementation Method 1
The first filter segment comprises cut or shredded plant material
Implementation Method 2
The second filter segment comprises a cellulose material as filtering material
Implementation Method 3
the filter is biodegradable according to OECD 301 B
Data Source
Figure 1
Figure 2
AI summary
A smoking article (1) comprises a smokable tobacco rod (2), which includes tobacco and a wrapper, and a filter (3) having a first end (4) and a second end (5). The filter (3) comprises a first filter segment (11) extending to the first end (4) of the filter (3) and placed at an end of the tobacco rod (2) and a second filter segment (12) extending to the second end (5) of the filter (3). The first filter segment (11) comprises cut or shredded plant material. The second filter segment (12) comprises a cellulose material as filtering material and has a length in the range of from 3 mm to 12 mm. The filter (3) is bio-degradable according to OECD 301 B.