Gravure-Printed Banded Wrapper Paper for Ignition and Self-Extinguishment
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Solution Overview
Problem
Existing smoking articles face challenges in meeting stringent ignition propensity (IP) and self-extinguishment (SE) requirements, with efforts to reduce IP often adversely impacting SE performance.
Innovation Solution
Application of fibrous crystalline cellulosic material in banded regions on smoking article wrappers, using a gravure printing process to control the distribution and permeability of the material, thereby enhancing both IP and SE performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If cellulosic material is applied to the wrapper paper to reduce ignition propensity, then IP value decreases, but SE performance deteriorates
Solution Approach 1:
The wrapper paper features bands of cellulosic material distributed at specific intervals rather than uniform coverage. This localized application creates regions with different burn characteristics - the cellulosic bands slow ignition in critical areas while leaving other regions to maintain self-extinguishment capability, thus resolving the contradiction between reducing IP and preserving SE performance
Solution Approach 2:
The wrapper paper is segmented into distinct banded regions with cellulosic material applied only to specific longitudinal sections. This segmentation allows different portions of the wrapper to perform different functions - some bands control ignition propagation while other portions allow controlled burning, thereby achieving both low IP and good SE performance simultaneously
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 improved IP and SE characteristics, meeting governmental standards with reduced ignition risk and enhanced self-extinguishment capabilities.
Implementation Method 1
a gravure printing process to a base web to form banded regions of fibrous crystalline cellulosic material on the base web
Data Source
Figure 1~2
Figure 3
Figure 4~5C
AI summary
A smoking article (120) includes a tobacco rod (122) comprising a column of filler and a wrapper (123) surrounding the column of filler. The tobacco rod (122) has a circumferential direction, a longitudinal direction (142), a lit end (124), and a mouth end (130). The wrapper (123) includes a base web (140) having generally parallel first and second side edges extending in the longitudinal direction (142) and two ends extending in the circumferential direction wherein the base web (140) is disposed around the column of filler such that the first and second side edges of the base web (140) overlap and form a seam. The base web (140) includes at least one circumferentially extending banded region (126) of fibrous crystalline cellulosic material (126) thereon. The fibrous crystalline cellulosic material (126) is in a condition of having been gravure printed on the base web (140) as a fibrous crystalline cellulosic slurry that comprises water, crystalline cellulose, and chalk wherein the fibrous crystalline cellulosic slurry has a solids content of about 10% or less by weight of the fibrous crystalline cellulosic slurry.