Headbox Width Control for Composite Nonwoven Webs
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Solution Overview
Problem
Existing devices for producing composite nonwoven webs with layers of long and short fibers cannot adjust the width of the second layer without negatively affecting fluid dynamics or reusing the separated fibers.
Innovation Solution
A device with a conveyor system and a headbox system that includes an interception device to separate and recycle short fibers, allowing for adjustable width of the second layer without disrupting fluid dynamics or the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the width of the second layer is changed by cutting off excess width after compaction, then the width of the composite nonwoven web can be adjusted, but the separated edge areas cannot be reused and material is wasted
Solution Approach 1:
The patent divides the width adjustment process into two independent stages: (1) width definition at the headbox level using adjustable side walls that segment the fiber dispersion before deposition, and (2) optional post-processing of edges. This segmentation allows width adjustment without material loss because the cutting operation is eliminated or minimized, and any edge trimming occurs after the main width control has already prevented excess material deposition.
Solution Approach 2:
The patent performs width definition in advance at the headbox system before the fibers are deposited onto the first layer. By using adjustable side walls to confine the fiber dispersion within desired width boundaries during the deposition process itself, the system prevents excess material from being deposited in the first place. This preliminary width control eliminates the need for subsequent cutting operations that would waste material, directly resolving the contradiction between width adaptability and material loss.
2Device complexity
If the width of the second layer is changed without a collecting device, then the manufacturing process is simpler, but the separated short fibers cannot be reused
Solution Approach 1:
The patent merges the width control function and the fiber collection function into a single integrated headbox system with adjustable side walls. The side walls simultaneously serve to (1) define the width boundaries of the second layer by confining the fiber dispersion, and (2) channel the fibers at the edges into collection zones where they can be recovered and reused. This merging eliminates the need for separate, complex collection devices while enabling fiber recyclability, thus resolving the contradiction between device simplicity and adaptability.
Solution Approach 2:
The adjustable side walls of the headbox system perform multiple functions: they act as width control barriers, guide fibers into collection zones, and enable both width adjustment and fiber recovery through a single structural element. This multi-functionality allows the system to achieve fiber recyclability without adding separate dedicated collection equipment, maintaining relative system simplicity while gaining the versatility of fiber reuse capability.
3Loss of substance
If a collecting device is added to recover short fibers, then fiber reuse is enabled, but the device complexity increases
Solution Approach 1:
The patent segments the headbox interior into distinct functional zones using adjustable side walls: a central deposition zone where fibers are laid onto the first layer, and edge collection zones where excess fibers are channeled for recovery. This segmentation allows the collection function to be integrated into the existing headbox structure rather than requiring a separate external collection system, thereby reducing the overall complexity increase that would result from adding a completely independent fiber recovery device.
4Manufacturing precision
If the width of the second layer is adjusted by cutting after compaction, then the desired width is achieved, but fluid dynamics of the headbox are negatively affected
Solution Approach 1:
The patent performs width definition in advance at the headbox level using adjustable side walls that confine the fiber dispersion within desired width boundaries during the deposition process itself. By establishing the final width configuration before the fibers leave the headbox, the system ensures that the fluid dynamics of the fiber dispersion are not disrupted by subsequent mechanical interventions. The side walls guide the flow smoothly, maintaining stable fluid dynamics while achieving precise width control, thus resolving the contradiction between manufacturing precision and fluid dynamics reliability.
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
Enables adjustable width of the composite nonwoven web while reusing short fibers, reducing waste and maintaining the efficiency of the manufacturing process.
Implementation Method 1
a headbox system with a headbox, in particular a hydraulic one, for delivering the short fibers, in particular in the form of an aqueous dispersion
Data Source
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AI summary
The invention relates to a device (100) for producing a composite nonwoven web (8) with at least two layers (4, 6), wherein the first layer (4) comprises long fibers, and the second layer comprises short fibers. The device has at least one conveyor device for transporting at least the first layer (4) in a conveying direction (2), a headbox system (19) preferably comprising a headbox (20) for dispensing the short fibers onto the upper face (32) of the first layer (4) between two edges, and a collecting device (21), by means of which some of the short fibers dispensed from the headbox system (19), preferably from the headbox (20), can be collected in the region of at least one of the two edges of the short fiber layer dispensed from the headbox system (19) before the short fibers dispensed in this region come into contact with the first layer (4).