Forming Fabric Thread Grouping for Hydraulic Markings
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Solution Overview
Problem
Modern fabric tapes used as forming wires in paper, cardboard, or tissue-making machines face challenges in providing both high fiber support and dimensional stability while minimizing hydraulic markings and ensuring planarity, as existing ratios of longitudinal threads in the fabric layers lead to inadequate support and visible markings.
Innovation Solution
A fabric tape design with a specific weaving pattern where the first and second fabric layers have interwoven longitudinal threads arranged in groups, ensuring each first longitudinal thread is adequately supported by a second longitudinal thread, and the weaving pattern is repeated with varying numbers of groups to inhibit visible hydraulic markings and enhance planarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the ratio of the number of longitudinal threads of the first fabric layer to the number of longitudinal threads of the second fabric layer is increased to more than one (e.g., 2:1, 3:2, 5:2), then fiber support is improved, but visible hydraulic markings increase and planarity deteriorates
Solution Approach 1:
The patent applies local quality by creating different group configurations within the fabric structure. Specifically, it defines first groups with one first longitudinal thread and one second longitudinal thread, and second groups with two first longitudinal threads and one second longitudinal thread. This local variation in thread grouping allows different regions of the fabric to have different support characteristics, improving fiber support while distributing hydraulic markings across multiple patterns rather than creating uniform visible markings.
Solution Approach 2:
The patent segments the longitudinal threads into distinct groups (first groups and second groups) with specific configurations. By dividing the continuous fabric structure into discrete thread groups with defined ratios and arrangements, the patent achieves better fiber support through localized thread density variations while the segmented group patterns help distribute and reduce visible hydraulic markings across the fabric surface.
2Manufacturing precision
If the ratio of the number of longitudinal threads of the first fabric layer to the number of longitudinal threads of the second fabric layer is increased to more than one (e.g., 2:1, 3:2, 5:2), then fiber support is improved, but planarity of the first fabric layer deteriorates
Solution Approach 1:
The patent implements local quality by defining specific group configurations where first longitudinal threads are supported by second longitudinal threads in controlled ratios. The first groups (1:1 ratio) and second groups (2:1 ratio) create localized support zones that maintain fabric planarity while providing adequate fiber support. This localized approach prevents the overall fabric from becoming non-planar while still achieving the necessary fiber support performance.
Solution Approach 2:
The patent segments the fabric structure into repeating units of first groups and second groups. This segmentation allows the fabric to maintain planarity at the macro level while providing enhanced fiber support at the micro level through the grouped thread configurations. The segmented approach distributes the structural load and prevents deformation that would otherwise occur with higher overall thread ratios.
3Stability of the object's composition
If comparatively thick longitudinal threads of the second fabric layer are used to provide adequate dimensional stability, then dimensional stability is improved, but the upper fabric layer becomes rather open with only slight fiber support
Solution Approach 1:
The patent applies local quality by creating specific group configurations where second longitudinal threads (which provide dimensional stability) are locally combined with first longitudinal threads in defined ratios. The first groups and second groups ensure that thick second longitudinal threads are strategically positioned to support the first fabric layer at critical points, maintaining dimensional stability while preventing the upper layer from becoming too open and ensuring adequate fiber support through the grouped thread arrangements.
Data Source
AI summary
A woven-fabric web, such as a forming fabric or forming wire, for a machine for producing and/or processing a fibrous web, has a first woven-fabric layer with first longitudinal threads and first transverse threads interwoven with the first longitudinal threads and a second woven-fabric layer with second longitudinal threads and second transverse threads interwoven with the second longitudinal threads. The weaving pattern of the fabric is repeated in pattern repeats. The first and second longitudinal threads are arranged in a plurality of groups in each pattern repeat, with a first group and a second group and at least one further of the first and/or second group. Each first group is formed from a first longitudinal thread and a second longitudinal thread arranged below the first longitudinal thread and the first and second longitudinal threads in each group are arranged at no offset or only a slight offset in plan view.