Leno Weaving Apparatus for Uniform Warp Tension
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Solution Overview
Problem
Conventional looms require high drive power and produce fabrics with inhomogeneous warp tension distribution, leading to reduced strength towards the edges and creasing issues, limiting their use in technical applications like glass filament reinforcement in concrete buildings.
Innovation Solution
A device with automatically driven leno weave apparatus arranged next to each other, using two leno threads to bind the weft thread over the fabric's width, with increased interlacings at the edges to achieve uniform tension distribution, and allowing for different shedding times to enhance fabric strength and porosity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional looms with heddle shafts are used, then fabric can be manufactured, but high drive power (70 kW or more) is required
Solution Approach 1:
The invention divides the fabric width into multiple zones with independent leno weave apparatus, each handling a specific segment. This segmentation allows localized control and reduces the overall drive power requirement compared to a single centralized drive system for the entire fabric width.
Solution Approach 2:
The leno threads are made dynamically adjustable through variable interlacing numbers at different positions across the fabric width. This dynamic configuration allows the system to optimize tension distribution and reduce peak drive power requirements by adapting the weave structure to local needs.
2Strength
If conventional looms are used, then fabric is manufactured, but inhomogeneous warp tension distribution occurs with reduced strength towards edges
Solution Approach 1:
The invention applies different numbers of interlacings at different positions across the fabric width. The leno weave apparatus is configured to create higher interlacing density at the edges and lower density at the center, locally optimizing tension distribution to achieve uniform overall tension across the fabric width.
Solution Approach 2:
The invention changes the interlacing parameter (number of interlacings) as a function of position across the fabric width. By varying this parameter from the center toward the edges, the system compensates for natural tension variations and achieves homogeneous warp tension distribution, improving both strength and manufacturing precision.
3Stability of the object's composition
If conventional looms are used, then fabric is produced, but creasing occurs in the edge region due to inhomogeneous tension
Solution Approach 1:
The leno weave apparatus creates locally optimized tension distribution by adjusting interlacing numbers at different positions. This local quality enhancement ensures that edge regions receive appropriate tension treatment, preventing creasing and maintaining fabric tautness throughout the entire fabric width.
4Manufacturing precision
If leno weave apparatus with variable interlacings are used, then uniform tension distribution is achieved, but device complexity increases
Solution Approach 1:
The system segments the fabric width into multiple zones with dedicated leno weave apparatus for each. This modular segmentation achieves uniform tension distribution through localized control while keeping individual apparatus units relatively simple and manageable.
Solution Approach 2:
The invention applies variable interlacing numbers that may exceed the minimum required in certain regions (particularly at edges) to ensure adequate tension distribution. This partial excessive action in critical zones allows simpler control mechanisms while achieving the overall goal of uniform tension distribution.
Data Source
AI summary
A device for manufacturing a fabric has a plurality of automatically working apparatus arranged next to one another on at least one carrier for manufacturing a leno weave (a leno weave apparatus). Two leno threads are fed to each leno weave apparatus. The device has at least one weft thread picking device; wherein the weft thread is introduced into the shed of leno threads raised by a plurality of leno weave apparatus. The weft thread is bound using at least two leno threads at a plurality of points behind the weft thread over the width of the fabric. At least one of the leno weave apparatus arranged in the end region of the fabric carries out a higher number of interlacings for achieving a homogenized warp tension distribution over the width of the fabric; and/or the lowering of the shed is carried out by the leno weave apparatus over the width of the fabric at different times for achieving a homogenized warp tension distribution.