Adjustable Roller Diameter for Tobacco Sheet Thickness Control
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Solution Overview
Problem
Existing methods for producing cast webs of homogenized tobacco material result in uneven thickness due to variations in slurry properties, leading to inhomogeneity and defects, which are costly and time-consuming to correct.
Innovation Solution
A method involving the formation of a slurry with alkaloids, cellulose fibers, and a binder, followed by compression between rollers to achieve a uniform thickness, with the ability to rapidly adjust the roller diameter to change the sheet thickness as needed, ensuring consistent product quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a casting blade and conveyor belt are used to determine sheet thickness, then the sheet thickness can be controlled, but imperfections in the blade, belt, or alignment cause uneven thickness and require slow realignment that stops production
Solution Approach 1:
The patent applies the dynamics principle by making the casting blade height adjustable during operation. The blade can be rapidly moved vertically to change the gap distance from the conveyor belt, allowing quick thickness adjustments without stopping production. This dynamic adjustment mechanism resolves the contradiction by enabling both precise thickness control and continuous high-speed production.
Solution Approach 2:
The patent implements parameter changes by varying the geometric parameter of the casting blade (its vertical position) to control sheet thickness. By changing the blade's height parameter dynamically, the system achieves precise thickness uniformity while maintaining production speed, as the adjustment does not require production cessation.
2Adaptability or versatility
If standard casting methods are used with varying slurry properties, then the casting process can handle different material conditions, but this leads to unintended thickness variations and web defects
Solution Approach 1:
The patent applies feedback by continuously monitoring the gap distance between the casting blade and conveyor belt, and automatically adjusting the blade position to compensate for slurry property variations. This closed-loop control system maintains consistent sheet thickness even when slurry viscosity, fiber size, or moisture content vary, resolving the contradiction between adaptability and 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 allows for precise control of sheet thickness, enabling quick adjustments without machine stops, resulting in a more homogeneous product with reduced waste and improved production efficiency.
Implementation Method 1
compressing the sheet between a first roller and a second roller, said first roller and second roller forming a gap therebetween where the sheet is inserted, to form a compressed sheet having a desired thickness
Data Source
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AI summary
The invention relates to a method for producing a sheet of a material containing alkaloids, the method comprising: - mixing a material containing alkaloids with water (6) to form a slurry (11); - forming a sheet (10) from the slurry (11); - compressing the sheet (10) between a first (307) roller and a second (308) roller, said rollers (307, 308) forming a gap (311) therebetween where the sheet (10) is inserted, to form a compressed sheet (10) having a desired thickness (t); and - changing the diameter (17) of the first roller (307) in order to change the desired thickness (t) of the compressed sheet (10). The invention also relates to an apparatus for producing a sheet (10) of a material containing alkaloids.