Pneumatic Deflection for Filter Tow Homogeneity
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Solution Overview
Problem
Existing filter rod machines produce filter rods with insufficient homogeneity due to mechanical deflection methods, which fail to achieve comparable homogeneity, draw resistance, and draw resistance distribution.
Innovation Solution
A pneumatically driven deflection device that interacts with a transport device to change the conveying direction of the filter tow strand, incorporating a transport nozzle and an arc of curvature for continuous deflection, enhancing turbulence and homogeneity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If mechanical deflection methods are used to change the conveying direction of the filter tow strand, then the device structure is simple, but the homogeneity and draw resistance of the produced filter rods are insufficient
Solution Approach 1:
The patent replaces the traditional mechanical deflection system (deflection rollers, V-shaped sections) with a pneumatic system. A transport nozzle directs compressed air to create a pneumatic cushion that supports and deflects the filter tow strand. This substitution eliminates mechanical contact points that caused uneven deflection and improved homogeneity while maintaining relatively simple device structure.
Solution Approach 2:
The patent introduces a pneumatic deflection mechanism where compressed air is supplied through a transport nozzle to create a pneumatic cushion beneath the filter tow strand. This pneumatic field provides uniform support and enables smooth deflection of the strand along a curved path, significantly improving the homogeneity of the produced filter rods compared to mechanical deflection methods.
2Manufacturing precision
If mechanical deflection rollers with V-shaped cross section are used to reduce distance between strands, then the device structure is established, but the draw resistance and draw resistance spread are insufficient
Solution Approach 1:
The patent replaces mechanical deflection rollers with a pneumatic deflection system. The transport nozzle directs compressed air to create a pneumatic cushion that uniformly supports the filter tow strand during deflection. This eliminates the uneven mechanical contact that occurred with V-shaped rollers, improving draw resistance distribution while maintaining comparable device complexity.
3Manufacturing precision
If air is blown into the funnel to improve homogeneity, then the homogeneity of filter material increases, but the device complexity and cost increase
Solution Approach 1:
The patent merges the transport function and the homogeneity-improving air blowing function into a single integrated system. The transport nozzle that directs the filter tow strand also supplies the compressed air that creates the pneumatic cushion and improves homogeneity. This consolidation achieves improved homogeneity without adding separate air blowing devices, thereby controlling device complexity and cost.
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 significantly improves the homogeneity and draw resistance of filter rods, reducing production costs and allowing for easier integration into existing machines.
Implementation Method 1
an essentially pneumatic field is applied in order to improve the homogeneity of the filter material in the filter rod
Implementation Method 2
the combination of the pneumatic transport with the deflection of the strand results in increased turbulence of the material, as a result of which a very homogeneous filter material is obtained
Data Source
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AI summary
The invention relates to a deflecting device for conveying and deflecting at least one continuous filter tow (13). Said deflecting device can be coupled to a forming part (2a, 2b), especially a feeding system of a machine used for producing filter rods. The inventive deflecting device is characterized by a conveying mechanism (40) for pneumatically conveying the at least one continuous filter tow (13) as well as a deflecting apparatus (50) which cooperates with the conveying mechanism (40) so as to deflect the continuous filter tow (13) in a substantially pneumatically driven manner.