Composite Forming Fabric Binder Weft Interlacing Pattern
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Solution Overview
Problem
Existing composite forming fabrics for papermaking lack stability and ease of seaming, particularly in the interconnection of paper side (PS) and machine side (MS) layers, which affects fabric wear and dimensional stability.
Innovation Solution
A composite forming fabric with a specific interweaving pattern of binder weft yarns that interlace with both PS and MS warps and wefts, ensuring only three MS warps pass under each MS weft and each warp interlaces with multiple non-adjacent wefts, enhancing stability and seaming by preventing interweaving with the same wefts in each repeat.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If binder weft yarns interlace with multiple MS warps in each repeat, then layer interconnection is improved, but fabric stability and wear resistance deteriorate
Solution Approach 1:
The binder weft pattern is segmented into multiple sections within each repeat, where different groups of MS warps interlace with different groups of MS wefts. This segmentation prevents any single warp from being overly constrained while maintaining comprehensive layer interconnection through the distributed interlacing pattern.
Solution Approach 2:
The interlacing pattern employs asymmetric distribution of warp-weft interactions, where specific MS warps interlace with specific MS wefts in a non-uniform pattern. This asymmetric arrangement creates varied constraint points that enhance overall fabric stability while maintaining reliable layer connection.
2Reliability
If MS warps interlace with multiple MS wefts in each repeat, then layer binding is improved, but ease of seaming deteriorates
Solution Approach 1:
The fabric repeat is divided into segments where different warp groups interact with different weft groups. This segmentation creates distinct interlacing zones that maintain strong layer binding while establishing predictable patterns at fabric edges that facilitate easier seaming operations.
Solution Approach 2:
Different regions of the fabric exhibit different interlacing characteristics. The local interlacing pattern is optimized for layer binding in the fabric body, while edge regions maintain patterns that are more amenable to seaming, creating local quality variations that satisfy both requirements.
3Stability of the object's composition
If complex interweaving pattern is used to bind layers, then fabric stability is improved, but device complexity increases
Solution Approach 1:
The binder weft yarns perform multiple functions simultaneously: they bind the PS and MS layers together while also forming part of the PS weave pattern. This merging of functions reduces the need for separate structural elements, achieving fabric stability without proportionally increasing weave pattern complexity.
Solution Approach 2:
The binder weft yarns serve universal purposes: they provide layer interconnection, contribute to the PS surface pattern, and participate in the overall fabric structure. This multi-functionality allows a single element to address multiple requirements, reducing overall system complexity.
Data Source
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AI summary
A composite forming fabric for a papermaking machine woven according to a repeating fabric weave pattern is provided. The fabric includes a paper side (PS) layer having a PS surface, with the PS layer including PS warps and PS wefts interwoven in a first repeating pattern, and a machine side (MS) layer having a MS surface, with the MS layer including interwoven MS warps and MS wefts. A plurality of pairs of binder weft yarns each including first and second binder weft yarns that are interwoven with the PS warps and the MS warps to bind the PS and MS layers together in the composite forming fabric. In each pattern repeat of the fabric weave pattern at least three of the MS warps pass under each MS weft, where said at least three of the MS warps are co-located adjacent to one another with a further one of the MS warps separating a first of the at least three warps from the others of said at least three warps, and each of the MS warps interlaces with at least two non-adjacent ones of the MS wefts.