Thermally Conductive Patches on Smoking Article Wrapper
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Solution Overview
Problem
Existing methods for applying heat conducting patches to smoking article wrapper materials face challenges such as inaccurate positioning and patch loss during high-speed manufacturing, leading to machine stoppages and reduced efficiency.
Innovation Solution
The method involves printing thermally conductive patches directly onto the wrapper material using a synchronized printing cylinder, eliminating the need for additional heat conducting webs and rollers, thereby ensuring precise placement and reducing manufacturing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If heat conducting patches are cut and applied at high speed using conventional methods, then productivity is improved, but manufacturing precision deteriorates due to inaccurate positioning
Solution Approach 1:
The patent combines the heat conducting patch material with the wrapper web into a single integrated structure. The heat conducting material is positioned between the wrapper web and the heat source, eliminating the need for separate patch application steps. This integration maintains high-speed manufacturing capability while ensuring precise positioning of the heat conducting material relative to the heat source.
2Device complexity
If heat conducting patches are applied using conventional cutting and transfer methods, then device complexity is reduced, but reliability deteriorates due to patch loss during transfer
Solution Approach 1:
The heat conducting material is integrated with the wrapper web in a single manufacturing step, eliminating the transfer process that causes patch loss. The material is positioned and secured between the wrapper and heat source simultaneously, preventing detachment during high-speed manufacturing operations.
3Manufacturing precision
If multiple separate components (foil web, rollers, cutting drums) are used for patch application, then manufacturing precision can be maintained, but device complexity increases
Solution Approach 1:
The patent simplifies the manufacturing system by integrating the heat conducting material application into the existing wrapper web handling process. The material is fed and positioned in conjunction with the wrapper web without requiring separate cutting drums, transfer rollers, or complex synchronization mechanisms, thereby reducing device complexity while maintaining precision.
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
This approach simplifies the manufacturing process, reduces machinery requirements, and enhances the appearance of smoking articles by preventing patch misplacement, while maintaining precise heat transfer efficiency.
Implementation Method 1
a patch of thermally conductive printable medium printed onto the wrapper... transfers the heat generated during combustion of the heat source to the aerosol-forming substrate via conduction
Data Source
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AI summary
There is provided a smoking article (101) comprising a carbonaceous combustible heat source (103), an aerosol-forming substrate (105) and a wrapper (111) circumscribing at least the heat source (103) and the aerosol-forming substrate (105). One or more heat conducting elements (119) overlie a rear portion of the heat source (103) and an adjacent front portion of the aerosol-forming substrate (105). At least one heat conducting element (119) comprises a patch of thermally conductive printable medium printed onto the wrapper (111). Also provided is a method for applying heat conducting patches (303) onto a web of smoking article wrapper material (305), wherein at least some of the patches (303) comprise an area of thermally conductive printable medium.