Thermal Laminate Rods Flame Ignition Prevention
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Solution Overview
Problem
Heated aerosol-generating articles face challenges in reducing the propensity for ignition when exposed to flames, as users may inadvertently attempt to light them like traditional cigarettes, leading to unintended combustion and an unsatisfactory user experience.
Innovation Solution
A co-laminated sheet comprising an aerosol-forming material and a thermally-conductive material, such as homogenized tobacco and aluminum foil, is gathered and wrapped in a metal foil to form a rod, which efficiently conducts heat away from the point of contact, reducing the likelihood of ignition and ensuring even heating for aerosol generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional cigarette structure is used, then it is easy to ignite with a flame, but this causes unintended combustion and harmful smoke constituents
Solution Approach 1:
The patent uses a co-laminated sheet comprising an aerosol-forming material layer and a thermally-conductive material layer (such as aluminum foil). This composite structure allows the thermally-conductive layer to rapidly conduct heat away from the aerosol-forming material when exposed to a flame, preventing ignition while still allowing controlled heating for aerosol generation. The combination of materials with different thermal properties resolves the contradiction between ease of ignition and prevention of harmful combustion.
2Object-affected harmful factors
If a thermally-conductive material is added to reduce ignition propensity, then flame ignition is reduced, but the structure becomes more complex
Solution Approach 1:
The patent combines the aerosol-forming material and thermally-conductive material into a single co-laminated sheet structure that is gathered and wrapped to form a rod. This merging of functions into a unified composite structure reduces the number of separate components needed, thereby limiting the increase in structural complexity while still achieving the goal of reduced ignition propensity through the thermally-conductive layer.
3Productivity
If the aerosol-forming material is heated efficiently, then aerosol generation is improved, but the risk of scorching and ignition increases
Solution Approach 1:
The thermally-conductive material layer creates a localized thermal management system where heat is rapidly conducted away from the aerosol-forming material at the point of flame contact. This local heat dissipation prevents ignition at the exposed surface while allowing controlled heating to occur when the article is properly positioned in the heating element, thus improving aerosol generation efficiency without increasing scorching risk.
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 discourages users from attempting to light the article with a flame, while ensuring efficient heat distribution and aerosol generation, minimizing scorching and enhancing the user experience by maintaining consistent volatile substance release.
Implementation Method 1
the thermally-conductive material conducts the heat away from the point of contact with the heat source
Implementation Method 2
an inhalable aerosol is typically generated by the transfer of heat from a heat source to a physically separate aerosol-forming substrate
Implementation Method 3
As the released compounds cool, they condense to form an aerosol that is inhaled by the consumer
Data Source
AI summary
A rod and a method of forming a rod are provided. The rod includes a gathered sheet of material circumscribed by a wrapper, in which the sheet of material is a co-laminated sheet comprising a layer of an aerosol-forming material and a layer of a thermally-conductive material and in which the wrapper is a metal foil. The method includes providing a continuous co-laminated sheet including an aerosol-forming material and a thermally-conductive material; gathering the co-laminated sheet transversely relative to its longitudinal axis; circumscribing the gathered co-laminated sheet with a metal foil wrapper to form a continuous rod; and severing the continuous rod into a plurality of discrete rods.