Laminate Wrapper Combustion Prevention in Aerosol Articles
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Solution Overview
Problem
Existing smoking articles, such as heat-not-burn devices, face challenges in preventing the aerosol generating material from being combusted, which can lead to an unsuitable smoking experience and increased oxygen flow, making them prone to burning.
Innovation Solution
A laminate wrapper structure comprising an outermost lacquer layer, an intermediate non-combustible metal foil layer, and an innermost paper layer, where the lacquer has a specific coefficient of friction to prevent ignition and enhance handling, and the metal foil reduces oxygen flow and thermal conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-layer paper wrapper is used, then the structure is simple and easy to manufacture, but the wrapper is prone to combustion and allows excessive oxygen flow
Solution Approach 1:
The patent applies composite materials by creating a multi-layer wrapper structure consisting of a paper layer and a metal foil layer. The paper layer provides structural integrity and handling properties, while the metal foil layer provides non-combustibility and oxygen barrier properties. This composite structure resolves the contradiction by combining materials with complementary properties to achieve both simplicity and reliability.
Solution Approach 2:
The patent applies segmentation by dividing the wrapper into distinct functional layers: a paper layer for structural support and a metal foil layer for combustion prevention and oxygen control. This segmentation allows each layer to perform its specific function optimally, resolving the contradiction between structural requirements and safety requirements.
2Ease of operation
If the lacquer has high friction coefficient, then handling and manufacturing are improved, but the surface becomes too rough for smooth operation
Solution Approach 1:
The patent applies local quality by applying lacquer with specific friction properties to the outer surface of the paper layer, while the inner surface and interface layers maintain their original properties. This allows the outer surface to have enhanced handling characteristics without affecting the internal functionality or creating excessive roughness that would harm operation.
Solution Approach 2:
The patent applies parameter changes by carefully controlling the lacquer formulation and application to achieve a specific friction coefficient range. This optimization resolves the contradiction by finding the optimal parameter value that provides sufficient handling friction without creating harmful surface roughness.
3Adaptability or versatility
If the metal foil layer is made thinner, then the wrapper becomes more flexible and easier to wrap, but the oxygen barrier and thermal insulation properties decrease
Solution Approach 1:
The patent applies composite materials by combining the metal foil layer with the paper layer in a multi-layer structure. This composite construction allows the metal foil to be thinner while the overall structure maintains sufficient oxygen barrier properties through the combined effect of layers, resolving the contradiction between flexibility and barrier performance.
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 laminate wrapper effectively prevents combustion, improves handling, and reduces side-stream airflow, ensuring a safer and more controlled heating process for aerosol generation without burning, enhancing user safety and manufacturing efficiency.
Implementation Method 1
the lacquer has a specific coefficient of friction to prevent ignition
Implementation Method 2
the metal foil reduces oxygen flow and thermal conductivity
Data Source
AI summary
There is described an aerosol generating article, the aerosol generating article comprising an aerosol generating material and a laminate wrapper arranged around the aerosol generating material, the laminate wrapper comprising at least three layers; wherein the outermost layer of the laminate wrapper comprises a lacquer, an intermediate layer comprises a non-combustible material, and the innermost layer comprises paper; and wherein at least part of the innermost layer is disposed in contact with the aerosol generating material. The aerosol generating article may serve to prevent a user lighting or igniting the aerosol generating material in the aerosol generating article.