Industrial Two-Layer Fabric Warp Binding Yarn Dehydration
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Solution Overview
Problem
Industrial two-layer fabrics used in papermaking face challenges in maintaining uniform dehydration properties without mesh opening closure due to binding yarns, which affects surface smoothness and paper quality.
Innovation Solution
The design features upper side warps and warp binding yarns arranged vertically, with the warp binding yarns passing over or under wefts in a manner that prevents mesh opening closure, ensuring uniform dehydration and surface smoothness by positioning the warp binding yarn knuckles between adjacent upper side warp knuckles, and alternating between different weaving designs to balance rigidity and fiber support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If warp binding yarns are used to weave upper and lower layers, then the fabric structure is stabilized and weaving strength is improved, but mesh openings are closed at binding yarn portions causing non-uniform dehydration
Solution Approach 1:
The fabric is divided into multiple layers with different weaving structures. The upper layer uses conventional warp binding yarn weaving for strength, while the lower layer uses a modified structure where binding yarns are positioned to avoid closing mesh openings, allowing uniform water drainage through the lower layer's open mesh structure.
Solution Approach 2:
Different portions of the fabric have different structural properties. The upper layer binding yarn portions provide strength stabilization, while the lower layer binding yarn portions are positioned to maintain open mesh structures for uniform dehydration, creating local functional differentiation within the same fabric.
2Manufacturing precision
If mesh thickness is decreased to reduce water retention, then dehydration property is improved, but fabric strength and rigidity are reduced
Solution Approach 1:
The solution moves from a single-layer thickness reduction approach to a multi-layer structural approach. By distributing the dehydration function across the lower layer's mesh structure while maintaining upper layer strength, the fabric achieves uniform dehydration without compromising overall rigidity through dimensional distribution of functional layers.
Solution Approach 2:
The fabric combines different weaving structures in composite layers - the upper layer provides structural strength through conventional binding yarn weaving, while the lower layer provides dehydration functionality through optimized mesh openings, creating a composite structure that achieves both strength and uniform dehydration properties.
3Manufacturing precision
If binding yarns are positioned to maintain mesh openings for dehydration, then uniform dehydration is achieved, but fabric strength and rigidity are reduced
Solution Approach 1:
The fabric is segmented into upper and lower layers with different functional requirements. The upper layer binding yarns maintain conventional positioning for strength, while the lower layer binding yarns are repositioned to maintain mesh openings for dehydration, allowing each layer to optimize its specific function without compromising the other.
Solution Approach 2:
The fabric exhibits local quality differentiation where the upper layer binding yarn portions provide structural strength and the lower layer binding yarn portions provide dehydration functionality. This local functional assignment allows the fabric to simultaneously achieve both strength and uniform dehydration without requiring compromise across the entire structure.
Data Source
AI summary
The industrial two-layer fabric has at least warp binding yarn pairs having an upper side warp and a warp binding yarn arranged vertically. On the upper side, between knuckles that two adjacent upper side warps have formed by passing over one or two upper side wefts, a warp binding yarn passes over one upper side weft to form a knuckle, whereby knuckles of the upper side warp, the warp binding yarn, and the upper side warp are formed in the mention of order over the one upper side weft. In the industrial two-layer fabric thus formed, the knuckle of the warp binding yarn does not protrude further than the knuckle of the upper side warps.