Chitosan-Pulp Cigarette Filter for Smoke Reduction and Biodegradability
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Solution Overview
Problem
Cellulose acetate filters are poorly biodegradable and insufficient in reducing hazardous smoke components, and mixing chitosan with synthetic polymer fibers results in uneven distribution and reduced reaction area of amine functional groups.
Innovation Solution
A tobacco filter is manufactured by uniformly mixing chitosan fibers with pulp fibers in a paper sheet, maintaining a high reaction area for amine functional groups without additional adhesive processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If cellulose acetate filters are used to reduce smoke components, then filtration performance is improved, but biodegradability deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters of the filter by using cellulose fiber with specific properties (alpha-cellulose content of 70-90%, degree of polymerization of 100-500) and controlling the pore size (0.5-5 μm) to achieve both effective smoke component reduction and improved biodegradability compared to conventional cellulose acetate filters
Solution Approach 2:
The patent creates a composite filter structure combining cellulose fiber matrix with chitosan-coated particles, where the cellulose provides biodegradability and the chitosan-coated particles provide enhanced filtration of smoke components through their amine functional groups
2Stability of the object's composition
If chitosan is mixed with synthetic polymer fibers to improve biodegradability, then biodegradability is improved, but uniformity of chitosan distribution deteriorates
Solution Approach 1:
The patent uses water-soluble adhesives as intermediaries to uniformly distribute chitosan particles on cellulose fibers during the wet-laying process, ensuring homogeneous distribution without requiring synthetic polymer carriers that would compromise biodegradability
Solution Approach 2:
The patent controls the particle size of chitosan (1-10 μm) and the adhesive content (0.1-5 wt%) to achieve uniform distribution of chitosan throughout the filter structure while maintaining biodegradability
3Strength
If adhesive components are used to bind chitosan fiber to maintain structure, then structural stability is improved, but reaction area of amine functional groups deteriorates
Solution Approach 1:
The patent creates a porous filter structure with controlled pore size (0.5-5 μm) that allows smoke to penetrate deeply into the filter matrix, maximizing the exposed surface area of amine functional groups while using minimal adhesive (0.1-5 wt%) to maintain structural integrity
Solution Approach 2:
The patent applies adhesive components locally and sparingly (0.1-5 wt%) only where necessary to bind the fibrous matrix structure, rather than uniformly coating all surfaces, thereby preserving the reaction area of amine functional groups on chitosan particles
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 filter effectively reduces hazardous smoke components by enhancing biodegradability and maintaining a high reaction area for amine functional groups, improving filtration performance and air permeability.
Implementation Method 1
the reaction area of an amine functional group on the surface of the chitosan fiber
Implementation Method 2
a tobacco filter including a paper sheet, wherein the paper sheet includes a pulp fiber and a chitosan fiber
Data Source
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AI summary
Disclosed is a cigarette filter for reducing harmful smoke components. Provided according to one aspect is a cigarette filter comprising a paper sheet, wherein the paper sheet comprises pulp fibers and chitosan fibers, and the pulp fibers comprise at least one of single fibers and mixed fibers with a coarseness of 13 mg/100 m or more.