Calendered Fibrous Web Filter for Smoking Articles
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Solution Overview
Problem
Existing smoking article segments struggle to independently adjust draw resistance and filtration efficiency over a wide range, while also being biodegradable and maintaining adequate hardness.
Innovation Solution
A segment comprising a calendered fibrous web as the filter material, where the fibrous web is compressed to a specific compression factor range (0.45 to 0.85), allowing for independent adjustment of draw resistance and filtration efficiency without compromising biodegradability or hardness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If paper is used as filter material to improve biodegradability, then biodegradability is improved, but draw resistance and filtration efficiency cannot be adjusted independently
Solution Approach 1:
The patent applies parameter changes by controlling the compression factor of the fibrous web during calendering to achieve independent adjustment of draw resistance and filtration efficiency. By varying the compression factor within specific ranges, the filter material properties can be modified without changing the basic paper structure, allowing flexible parameter adjustment while maintaining biodegradability.
Solution Approach 2:
The patent uses composite materials by combining fibrous web with calendering treatment to create a filter material that integrates the biodegradability of paper with the adjustable properties of compressed fibrous structures. This composite approach allows the material to maintain its biological decomposition characteristics while gaining tunable mechanical and filtration properties.
2Reliability
If more paper is used per unit volume to increase filtration efficiency, then filtration efficiency is improved, but draw resistance increases and segment becomes too hard
Solution Approach 1:
The patent resolves this contradiction by changing the compression factor parameter of the fibrous web. By optimizing the compression factor, the material achieves high filtration efficiency without requiring excessive material volume, thereby maintaining low draw resistance and appropriate hardness levels while improving reliability.
Solution Approach 2:
The patent utilizes porous materials by maintaining a controlled porous structure in the fibrous web through calendering. The porous structure allows efficient filtration without dense packing, enabling high filtration efficiency with reduced material quantity and consequently lower draw resistance and hardness.
3Strength
If less paper is used per unit volume to reduce filtration efficiency, then draw resistance decreases, but segment becomes too soft and filtration efficiency becomes too low
Solution Approach 1:
The patent applies parameter changes by adjusting the compression factor of the fibrous web to achieve the desired balance between draw resistance and filtration efficiency. This allows optimization of both parameters simultaneously rather than requiring a trade-off between material quantity and performance.
Solution Approach 2:
The patent uses porous materials with controlled pore structures that provide sufficient filtration efficiency even with reduced material volume. The porous structure maintains effective filtration while allowing lower draw resistance and softer segment characteristics.
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 calendered fibrous web segment achieves a low draw resistance with medium filtration efficiency, allowing for adjustable draw resistance without altering filtration efficiency, thus enhancing the flexibility and biodegradability of smoking article segments.
Implementation Method 1
the calendered fibrous web has a compression factor of at least 0.45 and at most 0.85, wherein the compression factor is the ratio between the density of the calendered fibrous web and the volume weighted density of the components of the calendered fibrous web
Data Source
AI summary
The invention relates to a segment for a smoking article which comprises a wrapping material and a filter material, wherein the wrapping material wraps the filter material and at least 10% and at most 100% of the mass of the filter material is formed by a calendered fibre web, wherein at least 50% and at most 100% of the mass of the calendered fibre web is formed by organic polymer fibres. The calendered fibre web has a compression factor C of at least 0.45 and at most 0.85.