Non-Crimp Fabric Edge Stabilization Using Localized Binder Activation
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Solution Overview
Problem
Non-Crimp Fabrics (NCFs) suffer from edge instability and fibre fraying during cutting, which compromises their drapability and structural integrity, especially in complex aerospace applications.
Innovation Solution
A method involving the application of a binder along the cutting path of NCFs, followed by heating and compression to activate the binder, ensuring improved adhesion between fibre tows and stitches, thereby enhancing edge stability and reducing fraying.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If denser stitching is applied to the NCF to improve edge stability, then edge stability is improved, but drapability is reduced
Solution Approach 1:
The patent applies binder material specifically at the cutting edges of the NCF rather than throughout the entire fabric. This localized treatment provides edge stability where needed while preserving the drapability of the rest of the fabric. The binder is applied in a controlled manner along the cutting path, ensuring that only the edge regions receive the stabilizing treatment.
Solution Approach 2:
The patent introduces a binder material as an intermediary substance between the fibre tows at the cutting edges. This binder acts as a mediating agent that binds the fibre tows together to prevent fraying and improve edge stability, without requiring modifications to the fabric structure itself that would compromise drapability.
2Strength
If the fabric is heated to activate the binder, then adhesion between fibre tows and stitches is improved, but excessive heating may affect fabric properties
Solution Approach 1:
The heating process is applied locally only to the regions containing the binder material along the cutting path, rather than heating the entire fabric. This localized heating activates the binder and improves adhesion between fibre tows and stitches while minimizing thermal effects on the rest of the fabric, preventing unwanted changes to fabric properties.
Solution Approach 2:
The patent controls the heating parameters (temperature, duration, distribution) to achieve binder activation without excessive heating. By carefully managing the thermal parameters, the binder is activated to provide strong adhesion while the overall fabric temperature remains within safe limits to preserve fabric integrity and properties.
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 results in NCFs with improved edge stability and reduced stitch retraction, maintaining drapability while ensuring the structural integrity of cut shapes for composite objects.
Implementation Method 1
activating the binder along the cutting path by heating the fabric; The binder is activated along the cutting path by heating the fabric along the cutting path
Implementation Method 2
compressing the fabric along the cutting path before the step of cutting
Data Source
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AI summary
A method and apparatus for cutting a Non-Crimp Fabric (10) is provided that improves edge stability and reduces stitch retraction. The part of the NCF (10) to be cut is treated with a binder and heated to activate the binder and therefore bind the tows (11) and stitches (13) together. By treating only the cutting path (15) the drapability of the wider fabric (10) is maintained. This may be achieved by heating only the part of the NCF (10) to be cut, or applying binder to only the part of the NCF (10) to be cut. The NCF (10) may be compressed and cooled before cutting to improve binding action. A ply cutter (20) may be adapted to carry out the invention by including a heat source and optionally a binder dispenser (32), compressor and cooler.