Smoking Article Wrapping Paper Low Diffusion Control
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Solution Overview
Problem
Existing wrapping papers for smoking articles with filler materials struggle to achieve a reliably low diffusion capacity for self-extinguishing or low smoldering speed, leading to inconsistent performance and increased harmful gas content in aerosols.
Innovation Solution
A wrapping paper composition comprising long-fiber pulp, refined short-fiber pulp, and inorganic filler materials, with specific refining degrees and proportions to control diffusion capacity and standard deviation, ensuring a stable and adjustable self-extinguishing or smoldering speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If wrapping paper contains filler materials to reduce cost and improve printability, then manufacturing cost decreases and printability improves, but diffusion capacity cannot be sufficiently reduced for reliable self-extinguishing
Solution Approach 1:
The patent uses a composite material system combining cellulose fibers (5-50% by weight) with a filler material (50-95% by weight), where the filler material itself is a composite of inorganic particles and an organic binder. This allows the wrapping paper to maintain structural integrity and achieve low diffusion capacity despite high filler content, resolving the contradiction between manufacturing cost and self-extinguishing reliability.
Solution Approach 2:
The patent changes the chemical and physical parameters of the filler material by specifying that it comprises inorganic particles (such as calcium carbonate, barium sulfate, or titanium dioxide) combined with an organic binder in specific ratios. This parameter optimization allows the filler material to contribute to both cost reduction and diffusion capacity control, enabling reliable self-extinguishing.
2Reliability
If wrapping paper diffusion capacity is reduced to ensure self-extinguishing, then self-extinguishing probability increases, but smoldering speed becomes unacceptably slow and harmful gas content increases
Solution Approach 1:
The patent optimizes the diffusion capacity parameter to a specific range (0.01-0.5 cm/s) by controlling the filler material composition and distribution. This parameter optimization ensures that the diffusion capacity is low enough to achieve self-extinguishing probability of at least 75% according to ISO 12863:2010, but not so low as to cause excessive smoldering speed reduction or harmful gas accumulation.
Solution Approach 2:
The patent creates a controlled pore structure within the wrapping paper that mimics optimal oxygen diffusion pathways. The binder material in the filler composite creates a matrix that allows sufficient oxygen transport for controlled combustion while preventing uncontrolled smoldering, effectively copying the desired diffusion behavior needed for safe self-extinguishing.
3Reliability
If wrapping paper diffusion capacity is uniformly reduced across the entire surface, then self-extinguishing reliability improves, but air permeability decreases and aerosol dilution effect is reduced
Solution Approach 1:
The patent applies local quality by creating regions with different filler material concentrations within the wrapping paper. The filler material is distributed non-uniformly, with higher concentrations in certain areas to provide self-extinguishing functionality and lower concentrations in other areas to maintain air permeability for aerosol dilution, thus resolving the contradiction between self-extinguishing reliability and aerosol dilution effectiveness.
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 provides a wrapping paper with a controlled diffusion capacity and low standard deviation, enhancing the reliability of self-extinguishing or reducing smoldering speed in smoking articles while maintaining mechanical strength and reducing harmful gas content in aerosols.
Implementation Method 1
the diffusion of oxygen into the smoking article is so low that the smoking article extinguishes by itself
Data Source
AI summary
The invention relates to a wrapping paper for a smoking article, said wrapping paper comprising long-fibre pulp, short-fibre pulp, and inorganic filler, wherein: at least a portion of the long-fibre pulp is ground and the ground long-fibre pulp constitutes at least 15% and at most 70% of the mass of the wrapping paper, at least a portion of the short-fibre pulp is ground and the ground short-fibre pulp constitutes at least 5% and at most 80% of the mass of the wrapping paper, and the ground short-fibre pulp has a freeness value of at least 20° SR and at most 60° SR; the short-fibre pulp as a whole constitutes at least 10% and at most 80% of the mass of the wrapping paper, at least 5% and at most 45% of the mass of the wrapping paper is constituted by one or more inorganic fillers; the mass per unit area of the wrapping paper is at least 15 g/m2 and at most 45 g/m2; the diffusion capacity of the wrapping paper is at least 0.05 cm/s and at most 0.5 cm/s; and the standard deviation of the diffusion capacity of the wrapping paper is at most 0.05 cm/s. The invention also relates to an associated manufacturing method and to a smoking article making use of said wrapping paper.