Two-Layer Fabric Secondary Weft Crimp for Drainage and Splash Control
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Solution Overview
Problem
Industrial papermaking fabrics face challenges in maintaining uniform drainage characteristics and preventing water retention in the inner space, leading to issues like splash and transfer of marks on paper, while also requiring rigidity and surface smoothness, which conventional methods fail to address effectively.
Innovation Solution
The development of an industrial two-layer fabric with a secondary weft that forms a long crimp in the inner space, reducing water retention by interweaving upper and lower side fabrics with warp or weft binding yarns, thereby decreasing the inner space volume and preventing splash without increasing fabric thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the inner space of the fabric is reduced to decrease water retention, then drainage property is improved, but surface smoothness and rigidity deteriorate
Solution Approach 1:
The fabric is divided into two distinct layers (first and second fabrics) with different functional characteristics. The first fabric layer provides drainage functionality with larger mesh openings, while the second fabric layer provides surface smoothness with smaller mesh openings, allowing each layer to optimize its specific function without compromising the other
Solution Approach 2:
Different regions of the fabric structure are assigned different properties: the first fabric layer has larger mesh openings for drainage, while the second fabric layer has smaller mesh openings for surface smoothness. This local differentiation allows the fabric to simultaneously achieve good drainage performance and surface quality
2Object-generated harmful factors
If the inner space of the fabric is reduced to suppress splash, then water retention is decreased, but fabric thickness is reduced
Solution Approach 1:
The fabric structure is segmented into two functional layers where the first fabric handles water removal and the second fabric provides surface stability. This segmentation allows the fabric to suppress splash through proper layer configuration without requiring excessive overall thickness
3Productivity
If mesh openings are enlarged to improve drainage, then drainage property is improved, but surface smoothness deteriorates
Solution Approach 1:
The fabric is segmented into two layers with different mesh opening sizes. The first fabric layer has larger mesh openings optimized for drainage, while the second fabric layer has smaller mesh openings optimized for surface smoothness, allowing both requirements to be satisfied simultaneously
Solution Approach 2:
Different mesh opening sizes are applied locally to different layers of the fabric structure. The first fabric layer uses larger openings for drainage functionality, while the second fabric layer uses smaller openings for surface quality, creating local optimization for each function
Data Source
AI summary
An industrial two-layer fabric has an inner space between an upper side fabric and a lower side fabric. Some or all of upper side wefts or lower side wefts are secondary wefts interwoven with upper side warps or lower side warps so as to make the number of warps passing on an upper surface of the upper side fabric or passing on a lower surface of the lower side fabric larger than that on an inner space side of the upper or lower side fabric and a long crimp in the inner space is formed by the secondary weft.