Paper Machine Clothing with Grouped Longitudinal Threads
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Solution Overview
Problem
Existing clothing designs for tissue web production suffer from suboptimal de-watering performance without compromising transverse stability and service life.
Innovation Solution
The clothing features first and second longitudinal threads arranged in groups within each repeat, allowing for direct and efficient water flow through the second woven-fabric layer, enhancing de-watering performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If the contact flotations of the second transverse threads are made longer to protect against wear, then the service life of the clothing is improved, but the transverse stability deteriorates
Solution Approach 1:
The patent applies local quality by differentiating the length of contact flotations in different regions of the clothing. Specifically, contact flotations are made longer in high-wear areas (such as along the edges and in regions subject to machine contact) to enhance durability, while maintaining shorter lengths in other areas to preserve transverse stability. This localized variation allows the clothing to simultaneously achieve both extended service life and adequate transverse stability.
2Stability of the object's composition
If the contact flotation length is reduced to improve transverse stability, then the transverse stability is improved, but the wear on second transverse threads increases
Solution Approach 1:
The patent implements local quality by strategically varying the contact flotation length across different regions of the second transverse threads. In areas subjected to high mechanical stress and friction (such as edge regions and zones contacting machine components), the contact flotations are extended to reduce wear. In other regions where transverse stability is the primary concern, shorter flotations are maintained. This spatially differentiated approach allows the clothing to achieve both reduced wear and improved transverse stability simultaneously.
3Stability of the object's composition
If more and shorter contact flotations are present to improve transverse stability, then the transverse stability is improved, but the de-watering performance deteriorates
Solution Approach 1:
The patent applies local quality by differentiating contact flotation characteristics in different regions of the clothing. In areas where transverse stability is critical, shorter contact flotations are used. In regions where de-watering performance is prioritized (such as central areas or regions with higher water content), the contact flotations are designed with different dimensions or spacing to maintain larger interstices for water flow. This regional differentiation allows simultaneous optimization of both transverse stability and de-watering performance.
Solution Approach 2:
The patent employs parameter changes by varying the dimensions, spacing, and distribution of contact flotations across different regions of the clothing. By adjusting these parameters locally rather than uniformly, the patent achieves optimal balance between transverse stability and de-watering performance in different functional zones of the same clothing structure.
Data Source
AI summary
A clothing for a machine for producing or processing a material web has a first and a second woven layer. The clothing has more first longitudinal threads than second longitudinal threads, but the number of first longitudinal threads is at most twice as large as the number of second longitudinal threads. Transverse threads of the second woven layer form contact floats on the machine contact side. Longitudinal threads of the first and second woven layer in each weaving repeat are arranged a first group and a second group. In the first group the longitudinal threads of the first and second layers are arranged precisely one above the other in the thickness direction of the clothing, while in the second group neither of two longitudinal threads of the first layer is arranged precisely above a single longitudinal thread of the second woven layer in the thickness direction of the clothing.