Phase Transition Material Coating for Cigarette Ignition Propensity
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Solution Overview
Problem
Existing smoking articles can ignite fire-prone substrates due to their ignition propensity, and current methods to reduce this propensity, such as starch-based coatings, are costly, limited to off-line implementation, and affect user experience.
Innovation Solution
Application of phase transition materials (PTMs) like paraffin, carnauba, and beeswax in a uniform, non-continuous layer on cigarette paper, which transitions from solid to liquid at burning temperatures, forming a dynamic, low-permeability band to reduce oxygen supply and prevent ignition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If starch-based coatings are applied to reduce ignition propensity, then ignition propensity is reduced, but manufacturing cost increases and user experience deteriorates
Solution Approach 1:
The invention changes the physical state parameter of the coating material by using phase transition materials that shift from solid to liquid at burning temperatures, fundamentally altering how the coating functions compared to traditional starch-based coatings
Solution Approach 2:
The coating utilizes phase transition properties where the material transitions from solid at room temperature to liquid at burning temperatures, creating a dynamic response that reduces ignition propensity without the drawbacks of starch-based coatings
2Object-affected harmful factors
If starch-based coatings are applied to reduce ignition propensity, then ignition propensity is reduced, but user experience deteriorates
Solution Approach 1:
The phase transition material remains solid during normal handling and only transitions to liquid at burning temperatures, ensuring normal user experience while providing fire safety when needed
Solution Approach 2:
The coating transitions from a static solid structure to a dynamic liquid state in response to temperature changes, allowing it to adapt its properties based on operational conditions
3Manufacturing precision
If a uniform non-continuous layer of phase transition materials is applied, then reproduction consistency improves, but application complexity increases
Solution Approach 1:
The coating is applied as a uniform non-continuous layer with specific areal density (0.1-10 mg/in²), creating localized zones of protection that maintain consistency across the wrapper surface
Solution Approach 2:
By controlling the areal density parameter of the phase transition material application, the invention achieves consistent reproduction of ignition propensity reduction across different manufacturing batches
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 solution effectively reduces ignition propensity while maintaining free burning capability and consumer acceptability, with improved reproducibility and reduced production costs, as the PTM layer is dynamic and moves with the burning cone, ensuring consistent self-extinguishment.
Implementation Method 1
phase transition materials (PTMs) like paraffin, carnauba, and beeswax in a uniform, non-continuous layer on cigarette paper, which transitions from solid to liquid at burning temperatures
Implementation Method 2
forming a dynamic, low-permeability band to reduce oxygen supply and prevent ignition
Data Source
Figure 1~2
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Figure 4
AI summary
A smoking article having a phase transition substance to impart reduced ignition propensity to a smoking article comprising a tobacco column and a wrapper surrounding the tobacco column and having a porous structure with a base permeability. The smoking article comprises a pattern of phase transition material on a surface of the wrapper such that, when the phase transition material is subjected to the heat of a burning firecone of the tobacco column, the phase transition material at least partially fills the wrapper porous structure in the vicinity of the burning firecone to form an area on the wrapper having a reduced permeability that is lower than the wrapper base permeability, imparting reduced ignition propensity when placed on a substrate.