Industrial Two-Layer Fabric Binding Yarn Placement
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Solution Overview
Problem
Industrial two-layer fabrics used in papermaking struggle to maintain uniform dehydration properties and surface smoothness due to mesh opening collapse and clogging issues at interwoven positions, particularly with the increased use of waste paper and faster papermaking machines, which affects dehydration efficiency and paper quality.
Innovation Solution
The fabric design incorporates a first warp set with a binding function and a second warp set, where at least one upper side warp functions as a warp binding yarn, woven alternately to prevent mesh opening collapse and ensure uniform dehydration, while also enhancing surface smoothness, rigidity, and wear resistance by strategically placing warp binding yarns between lower side warps and wefts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a warp binding yarn is used to bind upper and lower fabric layers, then binding strength and surface design are improved, but mesh openings at interwoven positions collapse and clog, reducing dehydration uniformity
Solution Approach 1:
The fabric is divided into upper and lower independent fabric layers with separate warp and weft arrangements. The binding function is achieved through the interlayer weaving pattern rather than a dedicated binding yarn, segmenting the functions of binding and dehydration across different layers while maintaining mesh opening integrity in each layer.
Solution Approach 2:
The binding function is transferred from a lateral yarn (warp binding yarn within a single layer) to a vertical interlayer connection. The upper and lower fabric layers are bound together by the interwoven pattern where warps and wefts of one layer pass over and under the other layer, achieving binding through the third dimension (depth/layering) rather than within the same plane.
2Productivity
If the papermaking machine speed is increased to improve productivity, then output increases, but dehydration uniformity deteriorates due to insufficient dehydration time and increased fiber mixing
Solution Approach 1:
The dehydration function is segmented and distributed across multiple independent mesh opening paths in the upper and lower fabric layers. This creates parallel dehydration channels that increase overall dehydration capacity and uniformity, allowing the system to handle higher speeds while maintaining consistent dehydration performance across the entire fabric surface.
Solution Approach 2:
The fabric utilizes the inherent porosity of the woven structure with systematically arranged mesh openings throughout both layers. This porous structure provides multiple simultaneous dehydration pathways that enhance water removal efficiency and uniformity, enabling the fabric to keep up with increased papermaking speeds without compromising dehydration quality.
3Adaptability or versatility
If waste paper content in raw materials is increased to improve resource utilization, then material efficiency improves, but dehydration becomes insufficient due to increased minute fiber mixing
Solution Approach 1:
The densely distributed mesh openings in both upper and lower fabric layers create an extensive porous network that effectively separates and removes fine fibers and fillers. This enhanced porous structure increases the fabric's capacity to handle materials with high waste paper content by providing sufficient dehydration pathways for the increased amount of minute fibers.
Solution Approach 2:
The fabric structure facilitates efficient hydraulic flow through its mesh opening configuration, allowing water and suspended particles to pass through uniformly. This hydraulic efficiency ensures that even with increased minute fiber content from waste paper, the dehydration process remains sufficient and uniform across the entire material stream.
Data Source
AI summary
An industrial two-layer fabric includes a first warp set and a second warp set that are placed alternately and form a weave design of the upper side fabric. The first warp set contains two upper side warps. At least one of the upper side warps of the first warp set functions as a warp binding yarn that binds the upper side fabric and the lower side fabric. The second warp set contains one of upper side warps and one of lower side warps placed below the one of the upper side warps. At a position where two adjacent lower side warps are woven with one of the lower side wefts, the warp binding yarn placed between the two adjacent lower side warps is woven with the same one of the lower side wefts.