Cigarette Paper With Nanoparticle Coating Zones
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Solution Overview
Problem
Conventional LIP papers used to reduce the incendiary potential of cigarettes often compromise on tar, nicotine, and carbon monoxide levels, and their application can cause manufacturing issues due to surface tension problems and uneven coating, which affects the cigarette's taste and ash integrity.
Innovation Solution
A paper with discrete areas treated using a formulation comprising cellulose nanoparticles with a median dimension of less than five micrometers, combined with combustion accelerator salts applied only to untreated areas, to reduce incendiary potential while maintaining the cigarette's functional aspects and ease of transformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If film-forming formulation is applied to block pores to reduce incendiary potential, then ignition risk is reduced, but tar, nicotine and carbon monoxide levels increase
Solution Approach 1:
The patent applies film-forming formulation only to discrete areas (transverse rings) of the cigarette paper rather than uniformly across the entire surface. This local treatment creates zones of low permeability to reduce ignition risk in specific areas while leaving other areas with higher permeability to maintain proper combustion characteristics and control levels of tar, nicotine and carbon monoxide.
Solution Approach 2:
The cigarette paper is divided into treated areas (with film-forming formulation) and untreated areas (without formulation). This segmentation allows different regions to perform different functions: treated areas provide ignition protection while untreated areas maintain combustion efficiency, resolving the contradiction between safety and chemical emission control.
2Object-affected harmful factors
If film-forming formulation is applied in discrete strips, then incendiary potential is reduced, but surface tension problems cause manufacturing issues
Solution Approach 1:
The patent modifies the physical and chemical parameters of the film-forming formulation, specifically controlling its viscosity and dry extract content within specific ranges. These parameter adjustments reduce surface tension effects and improve coating uniformity, eliminating manufacturing problems like bulging and uneven application while maintaining the discrete strip treatment pattern for ignition protection.
3Object-generated harmful factors
If natural porosity is increased to reduce tar and nicotine, then combustion efficiency decreases, but incendiary potential control is compromised
Solution Approach 1:
The patent creates local zones with modified porosity through film-forming treatment in discrete areas, while maintaining higher natural porosity in untreated areas. This spatial variation allows the cigarette to achieve reduced tar and nicotine levels through controlled airflow paths while preserving sufficient oxygen supply for proper combustion and ignition control in the untreated high-porosity regions.
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 effectively reduces the incendiary potential of cigarettes while preserving tar, nicotine, and carbon monoxide levels, improving the cigarette's combustion characteristics and manufacturing ease, ensuring compliance with regulatory standards and smoker comfort.
Implementation Method 1
a paper for a smoking article, in particular for a cigarette, comprising areas treated with a coating formulation adapted to reduce the incendiary potential of said treated area, in which the formulation comprises cellulose nanoparticles
Implementation Method 2
It has also been proposed to coat all or part of the paper with combustion retardant salts which cause endothermic reactions during the combustion of the paper
Implementation Method 3
This test is carried out on LIP treated areas by measuring the capacity of the paper to diffuse carbon dioxide. The prediction gives good results when the diffusivity of carbon dioxide is less than 0.3 cm/s
Data Source
Figure 1~3
AI summary
The invention relates to a paper (10) for an article to be smoked (1), in particular for a cigarette, comprising zones treated (11) with a coating formulation (13) suitable for reducing the incendiary potential of said treated zone, in which the formulation (13) comprises cellulose nanoparticles having a median size (d50) less than or equal to five micrometres.