Impulse Drive Fiber Spreading Device
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Solution Overview
Problem
Existing devices for spreading fiber bundles struggle to achieve high quality and uniformity with extremely low basis weights while maintaining high production speed, often resulting in lane formation and low basis weight limitations.
Innovation Solution
A device that uses an impulse drive to alternately apply additional speed components in the conveying direction and against the conveying direction of the fiber bundle during the spreading process, combined with a resistance mechanism, to effectively spread fibers without damaging them, allowing for extremely low basis weights and high degrees of spreading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional spreading devices use static bars and driven rollers arranged perpendicular to the fiber bundle direction, then spreading effect is achieved, but lane formation occurs and basis weight cannot be reduced below certain limits
Solution Approach 1:
The invention replaces static spreading elements with a dynamic impulse drive mechanism that applies periodic force pulses to the fiber bundle. The fiber bundle is conveyed through the impulse drive which applies alternating forces in the conveying direction and against it, dynamically separating fibers without creating lanes. This dynamic approach allows achieving basis weights around 16 g/m2 while maintaining uniform spreading, overcoming the limitation of conventional static devices.
Solution Approach 2:
The impulse drive operates by applying periodic force pulses to the fiber bundle during conveyance. The periodic application of force in alternating directions effectively separates individual fibers throughout the bundle without causing lane formation. This periodic action mechanism enables high degrees of spreading (8 to 10 times conventional methods) while maintaining uniformity and achieving extremely low basis weights.
2Manufacturing precision
If driven rollers are operated at high differential speed (at least three times the fiber bundle speed) to achieve spreading, then spreading effect is improved, but fiber damage risk increases and production speed flexibility is reduced
Solution Approach 1:
The impulse drive applies controlled periodic force pulses rather than continuous high-speed differential rotation. This dynamic force application separates fibers effectively while maintaining fiber integrity, avoiding the damage associated with high-speed conventional rollers. The mechanism achieves high spreading degrees without compromising fiber strength.
Solution Approach 2:
The invention changes the operational parameters from high continuous speed differential (3x or more) to controlled periodic impulse forces. This parameter transformation allows achieving equivalent or superior spreading effects while maintaining fiber integrity and enabling flexible production speed adjustment without the constraints of fixed high-speed roller operations.
3Manufacturing precision
If conventional devices use multiple rollers and static bars to spread fibers, then spreading is achieved, but device complexity increases and production speed is limited
Solution Approach 1:
The invention extracts and eliminates the need for multiple static bars and driven rollers by replacing them with a single impulse drive mechanism. This consolidation reduces device complexity while maintaining or improving spreading quality. The impulse drive performs the spreading function that previously required multiple components, simplifying the overall device structure.
Solution Approach 2:
The impulse drive mechanism serves multiple functions simultaneously: it conveys the fiber bundle, applies spreading forces, and controls tension. This multi-functional design replaces the need for separate rollers and static bars, reducing device complexity while achieving high spreading quality and allowing flexible production speed adjustment.
4Quantity of substance
If fiber bundles are spread to lower areal weights to reduce basis weight, then basis weight decreases, but gap formation and lane formation increase
Solution Approach 1:
The periodic impulse forces continuously act on the fiber bundle during conveyance, preventing gap formation even at extremely low basis weights. The alternating force directions ensure uniform fiber separation throughout the bundle, maintaining composition stability and preventing lane formation. This enables achieving basis weights around 16 g/m2 with high uniformity.
Solution Approach 2:
The dynamic impulse drive mechanism adapts to the fiber bundle during conveyance, applying forces that maintain uniform separation regardless of the target basis weight. This dynamic control prevents gap and lane formation even when spreading to very low areal weights, maintaining composition stability that static devices cannot achieve at low basis weights.
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 achieves extremely low basis weights of around 16 g/m2 and high degrees of spreading, up to 8 to 10 times that of conventional methods, without lane formation, and is flexible enough to handle various fiber materials by varying the frequency and amplitude of the speed components.
Implementation Method 1
sliding elements on one side of the fiber bundle exert a sliding contact on the fiber bundles
Implementation Method 2
The tension of the fiber bundle is controlled by this speed difference
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
A device and a method for spreading a fiber bundle are described. In the device, the fiber bundle is fed from a fiber bundle supply via a resistor 3 and a first impulse drive 4.1 interacting with this resistor 3 to a downstream fiber consumption unit 5. By means of the impulse drive 4.1, an additional velocity component in the direction of feed and/or an additional velocity component against the direction of feed can be imposed on the fiber bundle 1 in predefinable sequences during spreading.