Triangular Weft Yarns for TAD Fabric Pocket Depth
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Solution Overview
Problem
Existing TAD fabrics face limitations in achieving optimal sheet caliper, absorbency, and drying efficiency due to conventional round yarns, which restrict pocket depth and volume, leading to suboptimal sheet properties and increased energy consumption.
Innovation Solution
The use of triangular cross-section weft yarns oriented with their flat surface facing the machine side, interlacing with warp yarns to create deeper pockets and increased air permeability, enhancing pocket depth and volume, while maintaining robustness in the TAD environment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional round yarns are used in TAD fabric, then the fabric structure is simple and easy to manufacture, but the pocket depth and volume are limited, resulting in suboptimal sheet caliper and absorbency
Solution Approach 1:
The invention changes the geometric parameter of the yarn cross-section from circular to triangular. This parameter change directly increases the pocket depth and volume of the fabric structure, improving sheet caliper and absorbency while maintaining the same weave pattern and manufacturing process
Solution Approach 2:
The triangular cross-section creates localized geometric features at the yarn level that propagate to the fabric level, generating deeper pockets in specific regions. This local geometric modification achieves enhanced sheet properties without changing the overall fabric structure or weave pattern
2Productivity
If conventional round yarns are used in TAD fabric, then the air flow path is limited, but changing to triangular yarns increases air permeability and drying efficiency
Solution Approach 1:
Changing the yarn cross-section from circular to triangular modifies the air flow characteristics through the fabric. The triangular geometry creates more effective air channels, increasing air permeability and enhancing the drying rate, which reduces energy consumption for the same drying task
3Manufacturing precision
If triangular cross-section weft yarns are used, then pocket depth and volume increase improving sheet properties, but fabric complexity increases
Solution Approach 1:
The invention achieves enhanced sheet caliper by changing only the cross-sectional shape parameter of the weft yarns from circular to triangular, while maintaining the same weave pattern, yarn count, and fabric construction. This isolated parameter change increases pocket depth and volume without complicating the overall fabric structure or manufacturing process
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design improves sheet caliper, absorbency, and drying rate, reducing energy consumption and enhancing cleanability, while maintaining fabric robustness in hot, humid conditions.
Implementation Method 1
triangular cross-section weft yarns oriented with their flat surface facing the machine side, interlacing with warp yarns to create deeper pockets and increased air permeability
Implementation Method 2
passes through a through-air dryer, where a flow of heated air, directed against the web and through the TAD fabric or belt, dries the web to a desired degree
Data Source
Figure 1A~2
Figure 1B
Figure 1C
AI summary
A through-air-drying (TAD) fabric for producing tissue paper and related products on a papermaking machine comprising a plurality of warp yarns interwoven with a plurality of weft yarns to produce pockets on a paper-side surface of the fabric. The weft yarns have a substantially triangular cross-section and are oriented with their flat surface facing a machine side surface of the fabric. The points interlacing with the warp as they pass over and under the weft yarns produce an increased pocket depth and volume in the TAD fabric.