Leno Weave Textile for Composite Resin Permeability
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Solution Overview
Problem
Existing textile reinforcement methods for composite materials face challenges in achieving sufficient resin permeability for infusion processes while maintaining high mechanical performance, with traditional methods either generating resin accumulation or compromising mechanical properties.
Innovation Solution
A reinforcing textile complex with an intermediate layer comprising pairs of warp and weft threads, including high tenacity threads, woven in a gauze-like pattern to create channels for resin flow, acting as a 'structural internal drain' that enhances both permeability and mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a highly permeable draining fabric is used for resin flow, then resin permeability is improved, but mechanical properties deteriorate due to increased resin content in the final laminate
Solution Approach 1:
The patent employs a porous intermediate layer with controlled porosity to enable resin permeability while maintaining mechanical integrity. The layer's porous structure allows resin flow through the preform without requiring excessive resin content in the final laminate, thus resolving the contradiction between permeability and mechanical properties.
Solution Approach 2:
The invention uses a composite structure consisting of reinforcing layers combined with an intermediate draining layer. This composite approach allows the draining layer to facilitate resin flow while the reinforcing layers maintain mechanical strength, achieving both high permeability and good mechanical properties in the final composite material.
2Quantity of substance
If external draining fabric is used, then resin drainage is improved, but waste generation increases and setup time increases
Solution Approach 1:
The patent merges the draining function with the reinforcing structure by integrating an intermediate draining layer within the textile preform itself. This eliminates the need for separate external draining fabrics, thereby reducing waste generation and simplifying setup procedures while maintaining effective resin drainage.
Solution Approach 2:
The intermediate draining layer is designed to perform the drainage function as part of the preform structure itself, without requiring additional external components. The layer enables the preform to drain resin autonomously during the infusion process, reducing dependency on external draining systems and minimizing waste.
3Strength
If unidirectional structures with high density threads are used, then mechanical strength is improved, but resin permeability decreases
Solution Approach 1:
The patent segments the textile structure into multiple functional layers: reinforcing layers for mechanical strength and an intermediate layer for resin drainage. This segmentation allows each layer to perform its specific function optimally, with the intermediate layer providing permeability pathways that do not compromise the mechanical integrity of the reinforcing layers.
Solution Approach 2:
The invention applies local quality by creating regions with different properties within the textile structure. The intermediate layer has high porosity and permeability localized to facilitate resin flow, while the reinforcing layers maintain high density and strength. This spatial differentiation of properties resolves the contradiction between mechanical strength and resin permeability.
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
This configuration allows for efficient resin infusion with improved mechanical performance and reduced resin accumulation, balancing permeability and mechanical strength, enabling the production of high-quality composite materials.
Implementation Method 1
The permeability of a reinforcement represents its ability to be passed through by a fluid, in this case resin
Implementation Method 2
The infusion process is based on three fundamental physical principles which are pressure difference, resin viscosity and permeability
Implementation Method 3
On a microscopic scale, it is linked to the microporosities of the wicks (assembly of fibers)
Data Source
Figure 1~3
Figure 4
AI summary
A reinforcing textile complex for composite materials, comprising a stack of textile layers with a view to their impregnation by a polymer resin, the including complex comprising: • an assembly of weft threads (2); • an assembly of warp threads (3, 4) associated in pairs, each pair comprising two threads of different type, at least one of which (3) is based on high toughness threads, the two threads of a given pair being woven with the weft threads in a "leno" weave.