Aerosol Device Rolling Flat Tobacco Sheet
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Solution Overview
Problem
Aerosol-generating devices that use tobacco substrates require elaborate and costly manufacturing processes for forming tobacco rods, which can be inefficient and costly.
Innovation Solution
An aerosol-generating device that accommodates a sheet of aerosol-forming substrate in a non-rolled form and rolls it into a cylindrically shaped substrate using a holder and rolling device, eliminating the need for crimping and structuring, and allowing for reproducible resistance to draw.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a tobacco substrate is crimped and gathered to form a rod, then the rod structure is stable and supports aerosol generation, but the manufacturing process becomes elaborate and costly
Solution Approach 1:
Instead of crimping and gathering the tobacco substrate to form a rod, the invention inverts the approach by rolling a flat sheet of tobacco material into a cylindrical rod. This reversal of the forming process simplifies manufacturing while achieving the same structural stability needed for aerosol generation.
Solution Approach 2:
The invention changes the physical state and configuration parameters of the tobacco substrate from a crimped/gathered form to a rolled cylindrical form. By controlling the rolling parameters (diameter, tightness, alignment), the method achieves reproducible rod structures with consistent draw resistance, eliminating the need for complex crimping operations.
2Ease of manufacture
If a flat sheet of aerosol-forming substrate is used, then manufacturing and storage are simplified, but the substrate needs to be transformed into a cylindrical shape for device operation
Solution Approach 1:
The flat sheet of aerosol-forming substrate is designed to be self-rollable, meaning its physical properties (flexibility, thickness, material composition) inherently allow it to be rolled into a cylinder without requiring complex external forming equipment. The substrate serves its own forming needs through simple rolling action.
Solution Approach 2:
The substrate is prepared in advance as a flat sheet with appropriate dimensions and material properties that enable easy rolling. This preliminary preparation in a simple flat form allows for simplified manufacturing and storage, while the rolling action (performed just before use) transforms it into the required cylindrical shape for device operation.
3Manufacturing precision
If a rolled cylindrical substrate is formed, then reproducible resistance to draw is achieved, but the manufacturing process requires a rolling mechanism
Solution Approach 1:
The invention achieves reproducible resistance to draw by controlling key parameters of the rolling process: sheet thickness, rolling diameter, rolling tightness, and material density. By standardizing these parameters, the method produces consistent cylindrical substrates with reliable draw characteristics without requiring complex manufacturing equipment.
Solution Approach 2:
The rolling device applies localized control during the rolling process, ensuring uniform compression and consistent wall thickness around the cylindrical substrate. This localized quality control during forming ensures that the final product has reproducible draw resistance throughout its structure.
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 method simplifies manufacturing, reduces costs, and enhances storage and packaging efficiency, while maintaining product freshness and reducing damage during transport, by using a sheet of aerosol-forming substrate that can be easily rolled into a cylindrical shape without the need for crimping or complex structuring.
Implementation Method 1
Holding may be performed by frictional forces, for example holding the substrate against a post or between posts arranged in the device
Data Source
Figure 1~2
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Figure 6~12
AI summary
The aerosol-generating device comprises a device housing (2), a mouthpiece (3) associated to the device housing, a receiving chamber (4) configured to receive from external to the device at least a portion of a sheet of aerosol-forming substrate in a non-rolled form and configured to accommodate a cylindrically shaped of aerosol- forming substrate and a holder (6) for holding the sheet of aerosol- forming substrate. The device further comprises a rolling device (7) for receiving a flat or non-rolled sheet of aerosol-forming substrate and for rolling the sheet of aerosol-forming substrate around the holder from the non-rolled form into a cylindrically shaped aerosol- forming substrate.