Dual-Coating Cigarette Paper for Fire Safety and Taste
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Solution Overview
Problem
Existing low ignition propensity cigarettes face challenges in maintaining a fire-safe function while preserving the taste, as current solutions with single coating layers on cigarette paper can alter smoke flavor and oxygen flow.
Innovation Solution
A low ignition propensity cigarette paper with a first coating layer in the combustion section and a second coating layer in the cigarette butt section, where the basis weight and diffusion coefficient of the first layer are higher than the second, ensuring controlled oxygen inflow and maintaining taste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a single coating layer with low porosity is applied to the cigarette paper to achieve fire-safe function, then the oxygen inflow to cut tobacco leaf is reduced and fire safety is improved, but the taste of the cigarette changes due to altered oxygen flow
Solution Approach 1:
The single coating layer is divided into two separate coating layers: a first coating layer in the combustion section and a second coating layer in the cigarette butt section. This segmentation allows each layer to have optimized porosity for its specific function, resolving the contradiction between fire safety and taste preservation.
Solution Approach 2:
Different porosity characteristics are applied to different sections of the cigarette paper. The first coating layer has higher porosity (diffusion coefficient: 1.001-2.500 cm/sec) to maintain oxygen flow and taste in the combustion section, while the second coating layer has lower porosity (diffusion coefficient: 0.070-1.000 cm/sec) to ensure fire safety in the cigarette butt section.
2Object-generated harmful factors
If the porosity of the coating layer is increased to maintain cigarette taste, then oxygen flow is improved and taste is maintained, but the fire-safe function is compromised
Solution Approach 1:
The coating layer is segmented into two distinct layers with different porosity characteristics, allowing the first layer to optimize taste through higher porosity while the second layer ensures fire safety through lower porosity.
Solution Approach 2:
The patent applies different porosity levels to different spatial locations: the combustion section receives a higher porosity coating (1.001-2.500 cm/sec) for taste preservation, while the cigarette butt section receives a lower porosity coating (0.070-1.000 cm/sec) for fire safety.
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 dual-coating layer design effectively achieves a fire-safe function while minimizing taste deterioration, as demonstrated by increased oxygen flow in the first layer and reduced flow in the second, enhancing both safety and flavor consistency.
Implementation Method 1
a diffusion coefficient of the first coating layer may be greater than a diffusion coefficient of the second coating layer
Implementation Method 2
a basis weight of the first coating layer is smaller than a basis weight of the second coating layer
Data Source
Figure 1~3
Figure 4~5
AI summary
A low ignition propensity cigarette paper includes a first coating layer disposed in a combustion section combusted by smoking, and a second coating layer disposed in a cigarette butt section where smoking is finished, wherein a basis weight of the first coating layer is smaller than a basis weight of the second coating layer.