Patterned Cigarette Wrapper Using Starch Solution
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Solution Overview
Problem
Smoking articles with low ignition propensity (IP) values often self-extinguish when not in use, which is undesirable for adult consumers who prefer a consistent smoking experience without the need to re-light their cigarettes.
Innovation Solution
A cigarette wrapper with circumferential patch elements of add-on material applied in a single printing operation using an aqueous starch solution, which maintains low IP and self-extinguishment (SE) values by regulating diffusivity and airflow, ensuring the smoking article remains lit while minimizing self-extinguishment during free-burn conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the ignition propensity (IP) value is reduced to meet safety requirements, then the likelihood of causing substrate combustion is decreased, but the smoking article tends to self-extinguish during free burn conditions
Solution Approach 1:
The wrapper is divided into multiple circumferential bands of different materials: a first band with low diffusivity material (to reduce IP and prevent substrate ignition) and a second band with high diffusivity material (to maintain airflow and prevent self-extinguishment). This segmentation allows simultaneous optimization of both safety and reliability parameters.
Solution Approach 2:
Different regions of the wrapper are assigned different material properties: the first circumferential band uses low diffusivity material to control ignition propensity at the contact zone with substrate, while the second circumferential band uses high diffusivity material to maintain airflow and combustion continuity during free burn. This local differentiation resolves the contradiction between IP reduction and self-extinguishment prevention.
2Object-affected harmful factors
If a pattern of patch elements is applied to the base web to control ignition propensity, then the ignition safety is improved, but the manufacturing process complexity increases
Solution Approach 1:
The wrapper pattern is segmented into distinct circumferential bands with different material properties. This segmentation simplifies the printing process compared to complex multi-pattern designs, as each band can be applied using standard single-color printing techniques, reducing the complexity of the manufacturing process while maintaining IP control functionality.
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 achieves a balance of low IP and SE values, satisfying regulatory requirements while maintaining a desirable smoking experience by preventing premature self-extinguishment and ensuring the smoking article remains lit, thus addressing the challenge of achieving both low ignition propensity and self-extinguishment performance.
Implementation Method 1
maintains low IP and self-extinguishment (SE) values by regulating diffusivity and airflow
Data Source
AI summary
A process for making patterned cigarette wrapper includes the steps of: preparing a printing solution including the steps of: mixing at least water and a starch to form a starch mixture, heating the starch mixture to a temperature of at least about 180° F. preferably for at least about 30 minutes to release amylopectin and amylose, adding propylene glycol to the starch mixture, and mixing the starch mixture and propylene glycol to form a printing solution, wherein the solution is maintained and applied at elevated temperature (120° F. to 150° F.). The process also includes providing a base web of wrapper and applying the printing solution to the wrapper in a predetermined pattern.