Hydrophobic Cigarette Wrapper for CO Reduction
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Solution Overview
Problem
Combustible smoking articles suffer from increased carbon monoxide (CO) concentration in mainstream smoke as the cigarette wrapper's porosity decreases due to tar deposition, leading to reduced air dilution and diffusion, and the paper absorbs water and compounds, causing staining and weakening.
Innovation Solution
A hydrophobic wrapper with a permeability of at least 15 CORESTA units is used, where at least the inner or outer surface is treated with hydrophobic groups to inhibit tar deposition and water absorption, maintaining permeability and preventing staining.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the wrapper is made permeable to allow CO diffusion and air dilution, then CO concentration in mainstream smoke is reduced, but the wrapper absorbs water and compounds leading to staining and weakening
Solution Approach 1:
The wrapper is treated with hydrophobic groups at its surface to create a localized hydrophobic layer, while the bulk paper structure remains permeable. This allows the surface to repel water and tar compounds, preventing staining and weakening, while the interior structure maintains CO diffusion and air dilution capabilities
Solution Approach 2:
The wrapper combines cellulose-based paper material with hydrophobic groups (such as fatty acid esters or silanes) to create a composite structure that exhibits both permeability for gas diffusion and hydrophobicity for water resistance, resolving the contradiction between maintaining CO diffusion and preventing water absorption
2Object-affected harmful factors
If the wrapper porosity is maintained high for CO diffusion, then air dilution rate is improved, but tar deposition increases on the wrapper surface
Solution Approach 1:
The wrapper surface is modified with hydrophobic groups to create a localized hydrophobic barrier that prevents tar deposition, while the bulk paper structure maintains its porosity for CO diffusion and air dilution
Solution Approach 2:
The hydrophobic surface treatment that would normally be expected to reduce permeability actually prevents tar deposition that would otherwise block the pores, thereby maintaining the CO diffusion pathway by preventing the harmful accumulation of tar on the wrapper surface
3Reliability
If hydrophobic treatment is applied to the wrapper surface, then water absorption is reduced, but permeability may be compromised
Solution Approach 1:
The hydrophobic treatment is applied specifically to the wrapper surface in a controlled manner, creating a hydrophobic layer that does not completely seal the pores, allowing gas molecules to pass through while blocking water and larger tar compounds
Solution Approach 2:
The wrapper utilizes its porous structure combined with hydrophobic surface treatment, where the pores remain open for gas diffusion but the hydrophobic surface tension prevents water and tar compounds from entering and blocking the pores
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 hydrophobic wrapper maintains higher CO diffusion and air dilution rates, reducing CO in mainstream smoke and preventing water absorption, which helps in maintaining the wrapper's integrity and reducing visible staining.
Implementation Method 1
At least an inner or outer surface of the wrapper is hydrophobic via hydrophobic groups chemically bonded to the wrapper
Implementation Method 2
The porosity may affect the amount of diffusion of CO out of the tobacco rod through the wrapper
Implementation Method 3
The porosity of this wrapper may affect the amount of dilution air entering the tobacco rod through the cigarette wrapper
Data Source
AI summary
A smoking article includes a tobacco substrate and a wrapper disposed about the tobacco substrate. At least an inner or outer surface of the wrapper is hydrophobic via hydrophobic groups chemically bonded to the wrapper. The wrapper has a permeability of at least about 15 CORESTA units.