Cigarette Filter Composite Material Cohesion
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Solution Overview
Problem
Existing materials used in cigarette filters, such as activated carbon, tend to be brittle and produce dust when subjected to stress, which can lead to inhalation of fine particles, and do not offer sufficient cohesion or filterability.
Innovation Solution
A composite material composed of a porous polymer, such as cellulose acetate, combined with mineral oxides or activated carbon, with specific particle size and pore volume characteristics, that maintains cohesion under air pressure stress and enhances filterability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If activated carbon is used in cigarette filters, then adsorption of volatile and semi-volatile compounds is improved, but the material becomes brittle and produces dust under stress
Solution Approach 1:
The patent applies composite materials by combining activated carbon particles with a binder matrix (such as cellulose acetate, polyvinyl alcohol, or styrene-butadiene rubber) to create a cohesive composite material. This composite structure maintains the adsorption properties of activated carbon while the binder provides mechanical strength and reduces brittleness, preventing fine particle generation under stress.
Solution Approach 2:
The patent employs parameter changes by optimizing the particle size distribution of activated carbon (with D50 between 10-100 μm) and controlling the binder content (5-50 wt%) to achieve the right balance between adsorption surface area and mechanical cohesion. The pore volume is also controlled (0.2-2.0 cm³/g) to maintain adsorption capacity while ensuring structural integrity.
2Reliability
If mineral oxides or activated carbon are used as filter materials, then filterability is improved, but cohesion under air pressure stress deteriorates
Solution Approach 1:
The patent uses a binder as an intermediary material that mediates between the filter particles (mineral oxides or activated carbon) and the applied stress. The binder (such as cellulose acetate or polyvinyl alcohol) coats and binds the particles together, distributing stress evenly and preventing particle detachment, thereby maintaining both filterability and cohesion under air pressure stress.
Solution Approach 2:
The patent employs porous materials by controlling the pore volume (0.2-2.0 cm³/g) and using porous binders that maintain the porous structure of the filter material. This porous architecture allows efficient filtration while the binder ensures structural cohesion, preventing collapse under stress and maintaining both filterability and mechanical strength.
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 composite material exhibits high cohesion and filterability, reducing the generation of fine particles and improving the adsorption of volatile and semi-volatile compounds in cigarette smoke, while maintaining performance comparable to or exceeding that of activated carbon alone.
Implementation Method 1
improving the adsorption of volatile and semi-volatile compounds in cigarette smoke
Implementation Method 2
a pore volume (Vd1), made up of pores of diameter between 3.6 and 1000 nm
Data Source
AI summary
Composite materials having high cohesive strength, formed from at least one polymer and from at least one compound selected from among mineral oxides, aluminosilicates and active carbon, are characterized by a mean particle size of at least 100 mm, a pore volume (Vd1) formed by pores having a diameter ranging from 3.6 to 1,000 nm, equal to at least 0.2 cm3/g, a cohesive strength such that its content of particles having a size of less than 100 mm, obtained after being subjected to an air pressure of 2 bar, of less than 1.5%, preferably 0.0%, by volume; such composite materials are formed into useful liquid supports, catalyst supports, additives, or liquid or gas filters, in particular into cigarette filters.