Heat-Not-Burn Cigarette Paper With Boron Nitride Filler
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Solution Overview
Problem
Traditional cigarette papers have low thermal conductivity and instability at high temperatures, which hinders the release of nicotine and aromatic substances and can lead to unwanted odor production, affecting the taste of heat-not-burn cigarettes.
Innovation Solution
A heat-not-burn cigarette paper with boron nitride as a thermally-conductive filler is prepared using a process that includes pulp preparation, milling with boron nitride and calcium carbonate, sizing, papermaking, pre-drying, surface coating, and calendering, where boron nitride is uniformly dispersed into the fiber structure to enhance thermal conductivity and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If ordinary cigarette paper is used, then the manufacturing process is simple, but the thermal conductivity is low which hinders nicotine and aromatic substance release
Solution Approach 1:
The patent uses composite materials by combining boron nitride particles with cigarette paper matrix. Boron nitride is selected specifically for its high thermal conductivity properties, creating a composite structure that enhances heat transfer capability while maintaining the functional properties of cigarette paper. This directly addresses the low thermal conductivity issue without compromising the release efficiency of nicotine and aromatic substances.
2Temperature
If ordinary cigarette paper is baked at high temperature, then the heating function is achieved, but the paper shows instability leading to odor release and taste degradation
Solution Approach 1:
The patent converts the potential harm of high-temperature instability into benefit by selecting boron nitride, a material known for its exceptional thermal stability and chemical inertness at high temperatures. The boron nitride particles act as stabilizing agents that prevent the paper matrix from degrading, thereby eliminating odor release and taste degradation while maintaining the necessary heating function.
3Temperature
If boron nitride is added as thermally-conductive filler, then thermal conductivity and flame-retardant stability are improved, but the manufacturing process becomes more complex
Solution Approach 1:
The patent applies preliminary action by pre-dispersing boron nitride particles into the papermaking slurry before the papermaking process. This pre-mixing step ensures uniform distribution of the thermally-conductive filler throughout the paper matrix, eliminating the need for complex post-processing steps and simplifying the overall manufacturing process while achieving the desired thermal conductivity and flame-retardant stability.
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 cigarette paper exhibits improved thermal conductivity, flame-retardant stability, and retained whiteness, ensuring effective heat removal and maintaining the tobacco taste, suitable for heat-not-burn cigarettes.
Implementation Method 1
boron nitride as a thermally-conductive filler... improved thermal conductivity... ensuring effective heat removal
Implementation Method 2
milling with a filler... under stirring, adding 1 to 15 parts by weight of boron nitride and 20 to 50 parts by weight of calcium carbonate as a filler to the coarse pulp, heating to 60° C., and stirring for thorough mixing
Data Source
AI summary
A preparation method of a heat-not-burn cigarette paper with boron nitride as a thermally-conductive filler includes: mixing potassium oleate, polyvinyl alcohol (PVA) and water, thoroughly stirring under an ultrasonic condition, aging, and filtering until there is no precipitate; thoroughly mixing a resulting mixed solution with a softwood pulp and a hardwood pulp to obtain a coarse pulp; and under stirring, adding boron nitride and calcium carbonate as a filler to the coarse pulp, heating to 60° C., and stirring for thorough mixing to obtain a pulp for sizing and papermaking. The present disclosure effectively improves the stability of a cigarette paper by improving a coefficient of thermal conductivity of the paper. Boron nitride, when used as a thermally-conductive filler in a thin-walled or paper product, enables high heat removal capacity. The preparation method retains the original whiteness and transparency of the cigarette paper, and provides high conductivity.