Low-Ignition Cigarette Paper Coating Composition for Stable Viscosity
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Solution Overview
Problem
Existing cigarette paper coatings for low ignition propensity have short usage periods, are prone to aging, and degrade productivity and workability due to viscosity changes, especially at low temperatures, and require high-temperature drying, which increases costs and time.
Innovation Solution
A coating composition comprising Arabic gum, ethanol, and fructo- or galacto-oligosaccharide, with specific weight percentages, applied to cigarette paper to form coating portions, allowing for stable viscosity maintenance and room temperature drying, thereby extending service life and improving productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a coating composition made using alpha starch is applied to block oxygen inflow, then low ignition propensity is achieved, but the usage period is shortened due to aging properties
Solution Approach 1:
The patent changes the chemical composition parameters of the coating material from alpha starch to a composite system containing cellulose derivatives (methyl cellulose, carboxymethyl cellulose) and specific plasticizers (glycerin, propylene glycol). This parameter change fundamentally alters the aging resistance while maintaining the oxygen-blocking capability that provides low ignition propensity.
Solution Approach 2:
The patent employs a composite coating composition combining multiple cellulose derivatives with specific plasticizers and solvents. This composite structure synergistically provides both the oxygen-blocking function for fire safety and enhanced stability against aging, resolving the contradiction between reliability and duration.
2Productivity
If the coating composition is dried at high temperatures, then drying efficiency is improved, but the ignition propensity of the coating composition increases
Solution Approach 1:
The patent modifies the drying temperature parameter from high temperature to low temperature (room temperature or below 60°C). This parameter change is enabled by the specific composition containing volatile solvents (ethanol, water) that facilitate rapid evaporation at lower temperatures, thereby maintaining low ignition propensity while achieving adequate drying efficiency.
3Reliability
If the coating composition is dried at room temperature, then ignition propensity is reduced, but it becomes difficult to dry the coating composition
Solution Approach 1:
The patent uses a composite solvent system containing both volatile components (ethanol with 10-40 wt%, water with 30-60 wt%) and less volatile components (glycerin, propylene glycol). This composite composition enables effective drying at room temperature through the rapid evaporation of volatile solvents, resolving the contradiction between maintaining low ignition propensity and achieving adequate drying capability.
Solution Approach 2:
The patent changes the solvent composition parameters to include high proportions of volatile solvents (ethanol and water) that have high vapor pressure and evaporate rapidly at room temperature. This parameter change enables the coating to dry effectively without requiring high temperature, thus maintaining low ignition propensity while improving drying capability.
4Manufacturing precision
If the viscosity of the coating composition changes in a dynamic state such as rotation, then coating uniformity is affected, but productivity and workability are degraded
Solution Approach 1:
The patent optimizes the viscosity parameters of the coating composition by adjusting the ratio of plasticizers (glycerin, propylene glycol) and solvents. This parameter optimization ensures the coating maintains appropriate viscosity across different rotational speeds, preventing excessive thinning during dynamic application while enabling smooth, uniform coating and maintaining high productivity.
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 coating composition maintains viscosity and extends service life, reduces ignition propensity, and enhances manufacturing efficiency by allowing room temperature drying, thus reducing costs and time while maintaining coating quality.
Implementation Method 1
a coating composition made using alpha starch is applied to a cigarette paper to block the inflow of oxygen
Implementation Method 2
a period during which the coating composition maintains its original properties may be less than two months due to the inherent aging properties of starch
Implementation Method 3
when the coating composition is dried at high temperatures
Data Source
AI summary
Provided herein are a coating composition of a low ignition propensity cigarette paper, a smoking article using the same, and a method of manufacturing the low ignition propensity cigarette paper. The coating composition of the low ignition propensity cigarette paper according to some embodiments of the present disclosure includes Arabic gum, ethanol, water, and fructo-oligosaccharide. Fructo-oligosaccharide may remarkably delay the aging speed of the coating composition and block even fine pores so that the ignition propensity of the coating composition is significantly reduced.