Cigarette Wrapper Filler Gradient for Uniform Ignition Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The tobacco industry faces challenges in producing cigarettes with reduced ignition proclivity, as existing methods struggle to create uniform treated areas on cigarette wrappers that effectively self-extinguish when dropped or left on combustible materials, leading to inconsistent burning characteristics and carbon monoxide delivery.
Innovation Solution
A paper wrapper with a concentration gradient of filler particles is developed, where a higher concentration of filler particles is present on one surface, creating a smoother surface for applying an ignition reducing composition, resulting in more uniform and effective treated areas with reduced ignition proclivity and lower carbon monoxide delivery. The process involves forming a paper web with a filler particle gradient and applying an ignition reducing composition, such as alginate, to discrete areas on the wrapper.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If film-forming solutions are applied to cigarette paper to reduce ignition proclivity, then the cigarette's tendency to self-extinguish is improved, but the uniformity of treated areas and burning characteristics becomes inconsistent
Solution Approach 1:
The patent applies different filler concentrations at different locations within the paper structure. By creating a filler concentration gradient where filler particles are more concentrated at the outer surface than in the interior, the invention achieves uniform treated areas with consistent ignition proclivity reduction while maintaining reliable self-extinguishment characteristics across all cigarettes.
2Object-affected harmful factors
If discrete treated areas are created on cigarette wrappers, then ignition proclivity is reduced, but the properties of treated areas vary substantially between wrappers and areas
Solution Approach 1:
The patent changes the physical-chemical parameters of the paper structure by implementing a filler concentration gradient. This gradient ensures that the outer surface has sufficient filler concentration to provide uniform treated areas with consistent ignition proclivity reduction, while the gradual transition from interior to surface concentrations eliminates abrupt property variations between different treated areas and wrappers.
3Reliability
If the paper wrapper structure is modified to control burn rate, then ignition proclivity is reduced, but carbon monoxide delivery and burning characteristics become unpredictable
Solution Approach 1:
The patent creates a composite paper structure with a filler concentration gradient, combining cellulosic fibers with varying filler concentrations throughout the paper thickness. This composite structure provides predictable burning characteristics and controlled carbon monoxide delivery while maintaining reliable ignition proclivity reduction, as the gradient ensures uniform distribution of burn-resistant properties throughout the wrapper.
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 cigarettes with improved ignition proclivity control, passing ignition tests like the Mock-Up Ignition Test and Cigarette Extinction Test, while reducing carbon monoxide delivery and ensuring predictable burning characteristics, with treated areas exhibiting lower porosity variation and enhanced self-extinguishment properties.
Implementation Method 1
the filler particles form a concentration gradient over a thickness of the paper wrapper. Specifically, a greater concentration of filler particles is present at the first surface in comparison to the concentration of filler particles present at the second surface
Implementation Method 2
The treated area comprises an ignition reducing composition that reduces the ignition proclivity characteristics of a smoking article incorporating the paper wrapper. The ignition reducing composition can contain, for instance, a film-forming material such as an alginate, guar gum, pectin, a polyvinyl alcohol, a cellulose derivative, starch, a starch derivative, or mixtures thereof
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
Smoking articles (10) having reduced ignition proclivity characteristics are disclosed. The smoking articles include a paper wrapper (14) containing cellulosic fibers and filler particles. The paper wrappers are formed so that the filler particles form a concentration gradient throughout the thickness of the wrapper. More particularly, a greater concentration of filler particles are present at a first surface in comparison to the amount of filler particles present at the opposite surface. In accordance with the present disclosure, an ignition reducing composition is applied to the first surface. In this manner, treated areas having more uniform properties are formed.