Glue Application Roller for Tobacco Wrapping Strip Uniformity
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Solution Overview
Problem
Existing devices for applying glue to wrapping strips in the tobacco processing industry face issues with uneven glue distribution due to nozzle friction and laminar flow, leading to excessive glue application in the center, glue penetration, and reduced bond strength, causing contamination and increased production costs.
Innovation Solution
A rotationally driven roller is positioned between the nozzle outlet and the wrapping strip, with its direction opposite to the strip's movement, to rub down the glue to a constant width and thickness, ensuring even application and improved fiber bonding, thereby enhancing adhesive strength and reducing excess glue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a round nozzle opening is used to apply glue continuously, then the glue application volume can be controlled, but the glue exits unevenly with excessive amount in the center and insufficient amount at edges
Solution Approach 1:
The nozzle opening is divided into multiple separate openings (e.g., three rectangular openings) arranged in a specific pattern. This segmentation allows each opening to contribute to a specific region of the glue line, ensuring uniform distribution across the entire width without the parabolic profile problem of a single round opening.
Solution Approach 2:
Different regions of the nozzle opening have different characteristics - multiple localized openings are positioned to deliver glue to specific areas. This ensures that each region of the wrapping strip receives the appropriate amount of glue, with no region receiving excessive or insufficient amounts.
2Speed
If the glue outlet speed in the center is higher due to laminar flow, then more glue is applied in the middle, but this causes glue penetration through the porous wrapping strip
Solution Approach 1:
By segmenting the single high-speed central flow into multiple lower-speed distributed flows, the glue is delivered to different regions simultaneously at controlled rates. This prevents the excessive central velocity that causes penetration while ensuring adequate coverage at all positions.
Solution Approach 2:
The glue delivery is optimized for each local region independently. Each opening delivers glue at a speed appropriate for its specific location, preventing over-application and penetration in any single area while maintaining adequate adhesion throughout.
3Productivity
If the wrapping strip moves at high speed (600 m/min or more), then production costs are reduced, but the glue application becomes increasingly uneven
Solution Approach 1:
The segmented nozzle design creates multiple glue streams that are less susceptible to disruption at high speeds. The distributed openings ensure that even if one region experiences variation, other regions maintain proper glue application, preserving overall uniformity at high production speeds.
Solution Approach 2:
The nozzle design accounts for dynamic conditions at high speeds by positioning openings to compensate for effects such as glue flow lag and wrapping strip movement variations. This maintains consistent glue line quality across a range of operating speeds including 600 m/min and above.
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 solution achieves a significantly increased adhesive strength of over 300% by ensuring uniform glue application, minimizing excess glue, and reducing device soiling, with the roller's adjustable speed and geometry allowing adaptation to different products and speeds.
Implementation Method 1
a rotationally driven roller be provided between the wrapping strip and the outlet opening of the nozzle, onto which the glue emerging from the outlet opening is applied, and which applies the glue directly to the wrapping strip
Implementation Method 2
the movement of the roller on the side facing the wrapping strip being passed is directed opposite to the movement of the wrapping strip
Data Source
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AI summary
The invention relates to a device for applying a bead of glue (6) to a moving wrapping strip (1) of a rod-shaped product of the tobacco processing industry, comprising a nozzle (2) that is stationary relative to the wrapping strip (1) during the application of the bead of glue (6), and having an outlet opening (3) directed towards the moving wrapping strip (1) from which the glue emerges. A roller (4) is provided between the wrapping strip (1) and the outlet opening (3) of the nozzle (2), which is rotatably driven by a drive device. The glue emerging from the outlet opening (3) is applied to the roller, which then applies the glue directly to the wrapping strip (1). The direction of rotation of the roller (4) is such that the movement of the roller (4) on the side facing the moving wrapping strip (1) is opposite to the movement of the wrapping strip (1). is.