Blended Fiber Mat Formation With Vortex Debundling for Uniform Preforms
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Solution Overview
Problem
Current methods for forming fiber mats with blended fibers, such as glass and carbon fibers, face challenges in achieving uniform fiber density and orientation due to differences in fiber diameter and interactions, leading to inhomogeneous preforms and difficulties in debundling carbon fibers for production-scale applications.
Innovation Solution
A process and system that simultaneously cuts multiple types of fiber tows into chopped fibers, coats them with a binder, and uses a treatment chamber to form a blended fiber mat, incorporating a vortex tube for debundling and plasma treatment to enhance fiber dispersion and orientation, ensuring a homogeneous layer of randomly oriented fibers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional slurry-based preform formation is used, then fiber preforms can be produced, but fiber density becomes inhomogeneous with excess fibers at edges and deficiency at center regions
Solution Approach 1:
The patent replaces the traditional mechanical slurry-based fiber deposition system with a gas-phase fiber delivery system. Fibers are conveyed through a gas stream (typically air) that distributes them uniformly across the mold cavity, eliminating the edge accumulation and center deficiency problems inherent in screen-based mechanical deposition methods.
Solution Approach 2:
The invention employs pneumatic principles by using a controlled gas flow to transport and distribute fibers throughout the mold cavity. The gas stream carries chopped fibers and directs them to deposit uniformly on the mold surface, achieving homogeneous fiber density without the defects of traditional mechanical slurry methods.
2Weight of moving object
If carbon fiber tows are used instead of glass fibers, then weight reduction is achieved, but debundling becomes significantly more difficult at production scale
Solution Approach 1:
The patent applies segmentation by pre-chopping the carbon fiber tows into smaller, manageable lengths before gas-phase delivery. This chopping process naturally separates the tightly bound carbon fibers into individual filaments or small bundles, eliminating the need for difficult post-chopping debundling operations while maintaining production scalability.
Solution Approach 2:
The invention performs the debundling action preliminarily during the chopping process itself. By mechanically cutting the carbon fiber tows into short lengths before gas-phase transport, the fibers are pre-separated and ready for uniform distribution, avoiding the need for complex debundling equipment or manual intervention at production scale.
3Strength
If glass fibers are replaced with carbon fibers in molding compositions, then strength-to-weight ratio improves, but fiber-fiber interactions change making uniform blending difficult
Solution Approach 1:
The patent uses pneumatic gas-phase transport to convey both glass and carbon fibers simultaneously through the same delivery system. The gas stream keeps fibers separated and prevents aggregation, allowing uniform mixing and distribution of different fiber types in the mold cavity without the blending difficulties associated with traditional mechanical mixing methods.
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 process achieves a uniform distribution of fibers, improving the strength and quality of molded parts by ensuring even fiber distribution and orientation, suitable for structural applications like vehicle and aerospace components.
Implementation Method 1
a vortex tube for debundling and plasma treatment to enhance fiber dispersion and orientation
Implementation Method 2
a vortex tube for debundling and plasma treatment to enhance fiber dispersion and orientation
Data Source
AI summary
A process and system are provided for introducing a blend of chopped and dispersed fibers on an automated production line amenable for inclusion in molding compositions as a blended fiber mat for structural applications. The blend of fibers are simultaneously supplied to an automated cutting machine illustratively including a rotary blade chopper disposed above a vortex supporting chamber. The blend of chopped fibers and binder form a chopped mat. The chopped mat has a veil mat placed on either side, and is consolidated with the veil mat using heated rollers maintained at the softening temperature of thermoplastic binder, with consolidated mats being amenable to being stored in rolls or as flat sheets. A charge pattern is made using the consolidated mat, and the charge pattern can be compression molded in a mold maintained at a temperature lower than the melting point of the thermoplastic fibers.