Cigarette Filter Randomly-Oriented Fibers Particle Breakthrough
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Solution Overview
Problem
Existing cigarette filters with adsorbent materials like activated carbon experience particle breakthrough, where adsorbent particles are entrained in mainstream smoke and escape through the mouth end, due to the alignment of fibers allowing particles to travel through or along the filter channels.
Innovation Solution
Incorporating a plug of randomly-oriented fibers downstream of the adsorbent material in the filter assembly, which mechanically traps adsorbent particles by preventing them from passing through the channels between the fibers, thereby reducing or eliminating particle breakthrough.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If axially-oriented fibers are used in the filter plug, then the filter structure is simple and manufacturing is easy, but adsorbent particles can travel through channels between fibers and breakthrough into mainstream smoke
Solution Approach 1:
The patent changes the orientation parameter of the fibers from axially-oriented to randomly-oriented. This parameter change disrupts the formation of continuous channels through the filter plug, preventing adsorbent particles from traveling through the filter and breakthrough into mainstream smoke, while maintaining ease of manufacture.
Solution Approach 2:
The patent uses a composite structure combining randomly-oriented fibers with adsorbent particles (activated carbon or charcoal). This composite arrangement creates a more effective filtration medium where the randomly-oriented fiber matrix traps adsorbent particles that would otherwise escape through channels in axially-oriented filters.
2Object-affected harmful factors
If randomly-oriented fibers are used downstream of the adsorbent, then adsorbent particle breakthrough is reduced, but the filter assembly complexity increases
Solution Approach 1:
The filter plug is segmented into distinct functional zones: an upstream portion with axially-oriented or randomly-oriented fibers, a middle section containing the adsorbent particles, and a downstream portion with randomly-oriented fibers. This segmentation allows each zone to perform its specific function while maintaining overall assembly simplicity.
Solution Approach 2:
Different regions of the filter plug are given different fiber orientations and properties tailored to local requirements. The downstream region specifically uses randomly-oriented fibers to trap adsorbent particles, while other regions may use different configurations optimized for their local filtration needs.
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 use of randomly-oriented fibers significantly reduces adsorbent particle breakthrough in mainstream smoke, enhancing the filtration efficiency of cigarette filters by ensuring that adsorbent particles are captured, as demonstrated by reduced particle counts in tests compared to traditional filters with axially-oriented fibers.
Implementation Method 1
the randomly-oriented fibers mechanically trap adsorbent particles entrained in mainstream smoke
Implementation Method 2
Cigarettes typically comprise filter elements that may have adsorbent materials, such as carbon, incorporated therein
Data Source
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AI summary
Provided is a cigarette filter (10) and method of making the filter. The filter (10) includes an adsorbent (12) dispersed within the filter (10) and a downstream plug (16) of randomly-oriented fibers (14). The randomly-oriented fibers (14) mechanically capture adsorbent particles entrained in tobacco smoke. One or more plugs (25) of axially-oriented fibers (30) may also be located upstream or downstream or both of the adsorbent (12), and are included in an amount sufficient to adjust the length of the filter (10).