Grouped Weft Yarn Papermaking Fabric for High-Speed Weaving
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Solution Overview
Problem
Current papermaking fabrics are labor-intensive and costly to produce, sensitive to contamination, and have high air permeability, which limits their effectiveness in high-speed papermaking machines.
Innovation Solution
A papermaking fabric with grouped weft yarns that weave side-by-side with warp yarns, reducing interstices and air permeability, and a single-layer weave structure with alternating warp yarns over and under weft yarn groups, creating a discontinuous surface for improved sheet runnability and reduced contamination affinity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional weaving methods are used with separated weft yarns forming interstices, then air permeability is increased, but manufacturing cost increases and production speed decreases
Solution Approach 1:
Multiple adjacent weft yarns (2-6 yarns) are grouped together to weave side-by-side the same weave path with warp yarns, effectively merging multiple yarns into a single functional unit during weaving. This grouping allows the entire group to be inserted simultaneously as one unit, dramatically increasing weaving speed while reducing the number of insertion operations required.
2Object-affected harmful factors
If weft yarns are separated by interlacing warp yarns to form interstices, then air permeability is increased, but contamination affinity increases
Solution Approach 1:
By grouping multiple weft yarns together to weave the same path, the number of interstices (gaps between yarns) is significantly reduced. The merged yarn groups create a tighter fabric structure with fewer openings, thereby reducing both air permeability and the fabric's ability to trap contaminations from the papermaking process.
3Productivity
If multiple weft yarns are inserted simultaneously during weaving, then weaving speed increases, but weave structure complexity increases
Solution Approach 1:
The weft yarn system is segmented into distinct groups (2-6 yarns per group) that weave identical paths, separated by ungrouped weft yarns that weave different paths. This segmentation creates a systematic, repeatable pattern that simplifies the overall weave structure while enabling high-speed production through simultaneous multi-yarn insertion.
Solution Approach 2:
Different regions of the fabric have different weave characteristics: grouped weft yarns create regions with tight, uniform patterns for high-speed weaving, while ungrouped weft yarns provide variation in the weave path. This local differentiation allows optimization of specific zones for speed while maintaining overall structural integrity.
Data Source
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AI summary
The invention relates to a papermaking fabric comprising a system of warp yarns interwoven with a system of weft yarns, wherein said system of weft yarns comprise groups of weft yarns, each of said groups being formed by a plurality of adjacent weft yarns weaving in said group side-by-side the same weave path with said warp yarns. Further the invention relates to a method of manufacturing such a papermaking fabric.