Recycling Fiber Composites via Impact Reactor Needle Formation
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Solution Overview
Problem
Current recycling methods for fiber composite materials result in comminution products that are mainly used as filling materials, failing to improve material properties and requiring reapplication of coatings, leading to loss of original fiber strength and complexity due to strong fiber-matrix bonds.
Innovation Solution
A method involving mechanical stress in an impact reactor to produce needle-shaped fiber elements with adhering matrix, allowing for the recycling of both fiber and matrix components, resulting in comminution products that can be reused to create high-strength molded parts with improved material properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If elements containing fiber composite material are comminuted to produce powder, then the material can be recycled, but the result is mainly used as filling material without improving material properties
Solution Approach 1:
The invention changes the key parameter of comminution from producing fine powder to producing needle-shaped fibers with specific length (0.1-20 mm). This parameter change transforms the product from low-value filler to high-value reinforcement material that can be reused in composite applications with improved mechanical properties
Solution Approach 2:
The invention preserves the local quality of the fiber-matrix interface by maintaining the coating on fibers and preventing complete separation. The needle-shaped fibers with adhering matrix retain the original fiber characteristics and bonding properties, enabling high-quality reuse in new composite materials
2Loss of substance
If fiber material and matrix are completely separated, then the fibers can be reused, but the coating is removed and must be reapplied, increasing process complexity
Solution Approach 1:
Instead of complete separation of fiber and matrix, the invention applies partial action by maintaining the fiber-matrix bond and coating integrity. The comminution process breaks the composite into needle-shaped fibers while leaving the coating partially or fully intact, eliminating the need for complex re-coating operations
Solution Approach 2:
The invention extracts only the necessary separation to create needle-shaped fibers with adhering matrix, removing excess matrix material while preserving the essential fiber-coating-matrix structure. This selective extraction avoids the complexity of complete separation and reassembly
3Loss of substance
If fiber material and matrix are completely separated, then the fibers can be recovered, but the original fiber strength is no longer achieved
Solution Approach 1:
The invention performs preliminary action by preserving the coating and matrix adherence during comminution, preventing fiber degradation before the fibers are fully recovered. This ensures that when fibers are separated, they already maintain their original strength characteristics and do not require additional treatment to restore properties
4Ease of manufacture
If the coating on fibers is removed during separation, then the fibers can be freed from matrix, but the coating must be reapplied
Solution Approach 1:
The invention applies self-service by designing a comminution process that automatically preserves the coating and matrix adherence without requiring external intervention for coating reapplication. The needle-shaped fibers with adhering matrix are produced directly in the desired state, eliminating additional coating steps
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 method enables the production of molded parts with isometric strength behavior and high strength using recycled fiber needles, where the matrix adheres to the fibers, maintaining original material properties and reducing the need for reapplication of coatings, thus facilitating high-quality reuse of fiber composite materials.
Implementation Method 1
elements containing fiber composite material are placed in an impact reactor and comminuted by mechanical stress
Data Source
Figure 1
AI summary
The invention relates to a method for recycling fiber-reinforced composite materials, in which elements containing the fiber-reinforced composite material are introduced into an impact reactor (1) and are comminuted by mechanical stress, wherein the comminution is carried out such that fiber needles with an adhesive matrix are produced as a comminution product.