Flat MD-Yarn Dryer Fabric for Papermaking
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing dryer fabrics for papermaking machines are not optimal in terms of production cost and time efficiency, and they lack improved abrasion resistance and stability, which are critical for efficient drying and fabric durability.
Innovation Solution
A dryer fabric with MD-yarns and CD-yarns interwoven in a predetermined pattern, where MD-yarns have a non-circular cross-section with an extremely high width-to-height aspect ratio of at least 10:1, enhancing surface contact area and reducing production time and costs, while improving fabric stability and abrasion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional round yarns are used in dryer fabrics, then the fabric structure is simpler to manufacture, but the production time increases and abrasion resistance decreases
Solution Approach 1:
The patent changes the geometric parameters of the yarn cross-section from circular to non-circular with specific width-to-height aspect ratios greater than 10:1. This parameter change enables faster production and improved abrasion resistance while maintaining manufacturability through controlled flattening processes during yarn production.
2Productivity
If MD-yarns with high width-to-height aspect ratio are used, then surface contact area increases improving drying rate, but manufacturing complexity increases
Solution Approach 1:
The patent specifies optimal parameter ranges for the width-to-height aspect ratio (greater than 10:1, preferably 11:1 to 15:1) that balance the competing requirements of maximizing surface contact area for drying while maintaining ease of manufacture. This quantitative parameter optimization resolves the contradiction between drying performance and manufacturing feasibility.
3Productivity
If flattened monofilaments are used in press fabrics, then water removal improves and paper marking reduces, but the fabric surface becomes less smooth compared to round yarns
Solution Approach 1:
The patent transitions from the two-dimensional surface smoothness criterion to a three-dimensional volume contact area criterion. By flattening the yarn cross-section, the patent increases the contact area between the fabric and paper web in the thickness dimension, which improves water removal efficiency while the surface smoothness in the planar dimension is maintained at acceptable levels.
Data Source
Figure 1~4
Figure 5~6
AI summary
The present invention refers to a fabric (10) for a web-producing machine, such as a papermaker's machine for producing paper, tissue or board, comprising a machine-side and a paper-side and further comprising MD-yarns (12) and CD-yarns (14) interwoven with each other in a predetermined repeat pattern, wherein the MD-yarns (12) have a non-circular cross-section, and wherein a width-to-height aspect ratio of the MD-yarns (12) is greater than 10:1, preferably at least 11:1. Furthermore, the present invention refers to a web-producing machine, such as a papermaker's machine for producing paper, tissue or board, comprising a fabric (10) of one of the preceding claims, wherein the fabric (10) is preferably applied in a dryer section of the web-producing machine.