Deflection Bar with Rounded Elevations for Composite Fiber Expansion
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Solution Overview
Problem
Existing methods for fibre bundle expansion in composite material production often result in fibre breakage and uncontrolled expansion, leading to destabilization of the processing operation and reduced impregnation quality, especially with higher melt viscosities and take-off speeds.
Innovation Solution
The use of specially shaped deflection bars with radially circumferential rounded elevations to gently expand fibre bundles, followed by impregnation with a melt and drawing through a take-off die, minimizes fibre breakage and achieves controlled expansion, even of agglutinated bundles, using low take-off forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If increased deflection is used to achieve high fibre expansion, then fibre spreading is improved, but fibre breakage increases and processing stability deteriorates
Solution Approach 1:
The deflection bars are equipped with rounded elevations instead of sharp edges. This curvature allows fibres to follow the rounded path during deflection, reducing mechanical stress and breakage while still achieving effective fibre separation and expansion. The rounded geometry distributes the deflection force more evenly across the fibre bundle.
Solution Approach 2:
The invention changes the geometric parameters of the deflection bars by introducing rounded elevations with specific radii. This modification alters the deflection characteristics to be gentler on fibres while maintaining expansion effectiveness, resolving the contradiction between spreading quality and fibre integrity.
2Manufacturing precision
If multiple spreader devices are used to achieve complete fibre expansion, then fibre spreading is improved, but take-off forces increase and fibre damage worsens
Solution Approach 1:
Multiple deflection functions are combined into a single deflection bar by incorporating multiple rounded elevations on one bar. This consolidation achieves complete fibre expansion in one pass through the melt, eliminating the need for multiple separate spreader devices and reducing cumulative take-off forces.
Solution Approach 2:
The deflection bar is segmented into multiple rounded elevations that work in sequence to progressively expand the fibre bundle. Each elevation handles a portion of the expansion task, distributing the mechanical work along the fibre path rather than concentrating it at a single point.
3Productivity
If high take-off speed is used to increase productivity, then production rate is improved, but impregnation quality deteriorates with high melt viscosity
Solution Approach 1:
The invention replaces aggressive mechanical spreading methods with a gentler deflection mechanism using rounded bars. This substitution reduces fibre damage and creates a more stable fibre structure that maintains impregnation quality even at higher take-off speeds and with high-viscosity melts.
Data Source
AI summary
A process for the production of a fibre-composite material, the process including the following steps: a) a fibre bundle is conducted over at least one deflection bar having radially circumferential rounded elevations, thus being expanded; b) the expanded fibre bundle is subsequently drawn into an impregnation chamber; c) a melt is applied to the expanded fibre bundle; and d) the fibre bundle impregnated with melt is drawn through a take-off die at the end of the apparatus, and a corresponding device, which achieves very good impregnation quality.