Industrial Two-Layer Fabric Warp Binding for Hydration Control
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Solution Overview
Problem
Industrial two-layer fabrics face challenges in achieving optimal hydration properties, wear resistance, and surface smoothness while maintaining rigidity and preventing hydration marks and wire marks, especially under high-speed papermaking conditions.
Innovation Solution
The fabric features a 2:1 ratio of warps on the upper surface to those on the lower surface, with specific yarn arrangements forming ribbed cords to control hydration speed and reduce yarn diameter, enhancing lateral yarn density and preventing uneven hydration paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the fabric structure is designed to improve hydration property, then water absorption increases, but surface smoothness deteriorates and wire marks are generated
Solution Approach 1:
The patent applies local quality by creating different fabric structures in different regions: the first warp binding yarns form a first surface structure with different properties than the second warp binding yarns forming a second surface structure. This allows localized optimization where some areas provide hydration while others maintain smoothness and prevent wire marks.
Solution Approach 2:
The fabric is segmented into multiple functional components: first warp binding yarns, second warp binding yarns, and distinct surface structures. This segmentation allows independent optimization of hydration properties and surface smoothness in different segments, resolving the contradiction between water absorption and wire mark prevention.
2Strength
If the fabric is designed to increase rigidity and wear resistance, then structural stability improves, but hydration property deteriorates
Solution Approach 1:
The fabric segments rigid structural components (warp binding yarns providing strength and wear resistance) from hydration-functional components (surface structures with appropriate porosity). This allows the rigid framework to provide mechanical strength while the surface structures maintain hydration capacity.
Solution Approach 2:
The fabric uses composite construction combining different yarn types and structures: strong warp binding yarns for rigidity and wear resistance, combined with surface structures designed for water absorption. This composite approach enables simultaneous achievement of mechanical strength and hydration properties.
3Quantity of substance
If the net thickness is reduced to decrease water retention volume, then hydration mark generation decreases, but manufacturing precision and surface smoothness deteriorate
Solution Approach 1:
Different regions of the fabric have different thickness characteristics: areas with first warp binding yarns have different properties than areas with second warp binding yarns. This local quality variation allows reduced overall water retention while maintaining surface smoothness in critical areas where wire mark prevention is essential.
Data Source
AI summary
An industrial two-layer fabric includes an upper surface side fabric constituted by upper surface side warps and upper surface side wefts, one a lower surface side fabric constituted by lower surface side warps and lower surface side wefts, the upper surface side warps include a warp binding yarn, wherein two adjacent upper surface side warps that includes a upper surface side warp that weaves only the upper surface side wefts and the warp binding yarn form a pair, the warp binding yarn of the pair passes below three of the adjacent upper surface side wefts where the warp binding yarn passes below the one of the lower surface side wefts, a ratio of the number of the upper surface side warps to the number of the lower surface side is 2:1.