Patterned Cigarette Wrapper for Low Ignition and Wrinkle Control
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Solution Overview
Problem
Existing smoking articles face challenges in achieving low ignition propensity (IP) and self-extinguishment (SE) characteristics, with conventional wrappers often failing to meet regulatory requirements and experiencing issues like creasing and wrinkling during manufacturing due to the application of aqueous starch solutions.
Innovation Solution
The use of an aqueous starch solution with an anti-wrinkling agent and chalk, applied in alternating first and second pattern elements, to create a patterned wrapper that alternates IP performance, ensuring regulatory compliance while improving SE performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an aqueous starch solution is applied to the wrapper to reduce ignition propensity, then IP values improve (reduce), but the wrapper experiences creasing and wrinkling during manufacturing
Solution Approach 1:
The patent modifies the chemical composition parameters of the aqueous starch solution by adding specific additives (anti-wrinkling agents, chalk, and other compounds) to change the physical and chemical properties of the solution. This allows the solution to provide fire-retardant properties while simultaneously preventing creasing and wrinkling during the manufacturing process.
Solution Approach 2:
The patent creates a composite aqueous starch solution by combining starch with multiple other compounds including anti-wrinkling agents, chalk, and various additives. This composite material provides multiple functions simultaneously: fire retardation, wrinkle prevention, and manufacturing quality improvement.
2Reliability
If a patterned wrapper with alternating IP performance is created, then regulatory compliance is achieved, but the manufacturing process becomes more complex
Solution Approach 1:
The patent divides the wrapper surface into alternating pattern elements (first and second pattern elements) with different IP performances. This segmentation allows different regions of the wrapper to have different functional properties, enabling regulatory compliance while maintaining a manageable manufacturing process through systematic patterning.
Solution Approach 2:
The patent applies different concentrations or compositions of the aqueous starch solution to different regions of the wrapper, creating local variations in IP performance. The first pattern elements and second pattern elements have different IP characteristics, allowing the wrapper to meet regulatory requirements in specific areas while maintaining overall 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 IP values of less than 25% and SE values of less than 25%, reducing the likelihood of combustion and enhancing product appearance, while minimizing manufacturing defects such as creasing and wrinkling.
Implementation Method 1
aqueous starch solution...applied in alternating first and second pattern elements
Data Source
AI summary
A cigarette wrapper includes transversely extending banded regions applied by a printing technique, such as gravure printing. The banded regions may be applied in a one or more application of a printing composition that may be an aqueous starch solution also containing an anti-wrinkling agent such as propylene glycol, and calcium carbonate. The pattern of banded regions may be bands or stripes and the like along and/or around the tobacco rod. The banded regions may be solid or contain any number of cross-web and/or longitudinal discontinuities. The pattern may be configured so that when a smoking article is placed on a substrate, at least two longitudinal locations along the length of the tobacco rod have film-forming compound located only on sides of the smoking article not in contact with the substrate.