Heat-Resistant Wrapper Paper with Char-Former Composition
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Solution Overview
Problem
Existing wrapper papers for aerosol-generating articles lack sufficient heat resistance, mechanical strength, and flame-retardant properties, leading to potential tearing, fire risks, and environmental non-biodegradability, while also failing to prevent smoking-like combustion.
Innovation Solution
A wrapper paper comprising at least 70% pulp fibers and 5-20% char-former, with a specific tensile strength retention ratio after heating, ensuring high initial strength and flame-retardancy, and optionally combined with a further paper layer for improved appearance and protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the wrapper paper is made with high calcium carbonate content (at least 50%) to improve heat resistance, then the flame-retardant effect is enhanced, but the tensile strength decreases and the paper becomes brittle
Solution Approach 1:
The patent changes the chemical composition parameters by limiting calcium carbonate to 10-40% and introducing char-formers (ammonium phosphate, guanyl urea phosphate, or melamine phosphate) at 1-10%, replacing the conventional high calcium carbonate approach with a different chemical mechanism for flame retardancy that preserves strength
Solution Approach 2:
The patent creates a composite material combining pulp fibers (70-90%) with specific char-forming chemical compounds, where the char-formers undergo thermal decomposition to form protective char layers that prevent combustion while maintaining the mechanical integrity of the paper structure
2Temperature
If the wrapper paper uses aluminum foil laminate to protect from heat, then heat resistance is improved, but the manufacturing complexity increases and biological degradability decreases
Solution Approach 1:
The patent extracts and removes the aluminum foil laminate layer from the wrapper paper structure, eliminating the complex manufacturing process and environmental issues associated with non-biodegradable materials, while achieving heat resistance through chemical composition alone
Solution Approach 2:
The patent uses biodegradable pulp fibers as the base material, accepting that the paper will decompose naturally after use, which simplifies manufacturing and environmental disposal compared to permanent aluminum foil laminates
3Ease of manufacture
If the wrapper paper has low fiber content to reduce cost, then manufacturing cost decreases, but the tensile strength becomes insufficient for handling
Solution Approach 1:
The patent optimizes the fiber content parameter to 70-90% pulp fibers, maintaining sufficient mechanical strength for handling while controlling material costs, and compensates for any strength reduction through the addition of char-forming chemical compounds
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 wrapper paper maintains mechanical strength and prevents smoking-like combustion, while being biodegradable and processable, addressing the limitations of prior art papers.
Implementation Method 1
the char-former undergoes thermal decomposition to form a protective char layer that prevents combustion and maintains mechanical strength at high temperatures
Data Source
AI summary
The invention concerns a wrapper paper which is suitable for use on aerosol-generating articles and which comprises pulp fibers and a char-former, wherein the pulp fibers make up at least 70% and at most 95% of the mass of the wrapper paper and the char-former is contained in a concentration of at least 5% and at most 20% with respect to the mass of the wrapper paper and is present in a concentration in the wrapper paper such that the quotient r=RT/Ro of the tensile strength Ro, measured in accordance with ISO 1924-2:2008 under the conditions of ISO 187:1990, and of the tensile strength RT, measured in accordance with ISO 1924-2:2008 under the conditions of ISO 187:1990 after the wrapper paper has been exposed to a temperature of 230° C. for one minute, is at least 0.20 and at most 0.90.