Helical Textile Uniform Thickness via Variable Weft Lengths
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Solution Overview
Problem
Existing helical textiles crimp fibers due to interlacing in traditional weaving processes, reducing their effectiveness in reinforcing composite materials and resulting in non-uniform thickness.
Innovation Solution
A warp knit helical textile with a repeating pattern of weft fibers of varying lengths, secured by non-reinforcing knitted stitches, using modified warp knitting machines with conical take-up rolls to maintain uniform thickness and consistent fiber distribution from inside diameter to outside diameter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional weaving processes are used to create helical textiles, then the fabric structure is formed with interlaced warp and weft fibers, but the fibers are crimped which reduces reinforcement effectiveness
Solution Approach 1:
The textile structure is segmented into discrete warp layers and weft layers that are constructed one above the other rather than being continuously interlaced. This segmentation allows each layer to maintain straight fibers while still forming the helical structure through the arrangement of discrete layers.
Solution Approach 2:
The harmful interlacing action that causes fiber crimping is extracted and replaced. Instead of interlacing warp and weft fibers, the invention uses knitted stitches to secure the layers together, eliminating the source of fiber crimp while maintaining fabric integrity.
2Shape
If traditional weaving processes are used to create helical textiles, then the fabric structure is formed, but the thickness is non-uniform
Solution Approach 1:
The weft fiber insertion process is made dynamic by using variable length weft fibers instead of uniform lengths. The different weft fiber lengths compensate for the conical shape of the take-up rolls, ensuring uniform thickness throughout the helical textile by adjusting the insertion pattern dynamically across the fabric width.
Solution Approach 2:
The parameter of weft fiber length is changed from uniform to varying lengths. This parameter change allows the textile to maintain uniform thickness despite the conical take-up rolls by adjusting the length of weft fibers inserted at different positions across the fabric width.
3Shape
If warp knitting with conical take-up rolls is used, then uniform thickness is achieved, but the process requires modified machinery
Solution Approach 1:
The conical take-up rolls serve multiple functions: they provide the necessary conical shape to compensate for weft fiber length variations, maintain uniform thickness throughout the textile, and enable the warp knitting process to produce helical structures. This multi-functionality justifies the machine modification by consolidating several requirements into a single component.
Data Source
AI summary
A helical textile having a substantially uniform thickness from ID to OD having circumferential warp fibers; non-interlaced radially aligned weft fibers having fiber lengths that may vary with the textile diameter to maintain constant textile thickness, the warp fibers and weft fibers not interlaced together; and non-reinforcing binding yarns securing the warp fibers to the weft fibers, thereby forming a helical textile.