Angled Twill Papermaking Fabric for Warp Stability
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Solution Overview
Problem
Existing woven papermaking fabrics are limited to topographies oriented substantially in the machine direction, leading to issues such as warp filament slackness and breakage, and limitations in creating aesthetically appealing and durable tissue products.
Innovation Solution
A woven papermaking fabric with a three-dimensional topography featuring protuberances oriented at angles relative to both the machine direction and cross-machine direction, intersecting to form discrete valleys, providing a twill pattern with specific element angles and overlap configurations for warp and shute filaments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If machine direction oriented ridges are formed using traditional woven fabrics, then the fabric can be manufactured with standard weave structures, but the ridges become slack and warp filaments break due to tension differences
Solution Approach 1:
The patent transitions from traditional machine direction (MD) oriented ridges to ridges oriented at an angle (e.g., 45 degrees) relative to the MD axis. This angular orientation creates a new dimensional approach where warp and weft filaments share tension more evenly, preventing the slackness and breakage that occurs with conventional MD-oriented structures. The angled ridges distribute mechanical stresses across both filament systems, enhancing overall fabric reliability.
2Shape
If warp filaments are grouped to form wider ridges, then the aesthetic appearance and bulk of tissue products are enhanced, but the tension distribution becomes uneven causing ridges to cease weaving
Solution Approach 1:
The patent employs asymmetric weave structures where the number of warp filaments grouped together varies across different sections of the fabric. Instead of uniform grouping, the design creates regions with different ridge widths and filament densities, allowing wider ridges for aesthetic enhancement while maintaining structural stability through strategic placement. This asymmetric approach prevents the uniform tension distribution problems that cause ridges to cease weaving.
3Shape
If ridges are oriented at angles relative to the machine direction axis, then aesthetic appearance is enhanced, but the degree of orientation is limited by manufacturing constraints
Solution Approach 1:
The patent implements dynamic ridge orientation where the angle of ridges relative to the machine direction can vary across different sections of the fabric. Rather than being fixed at a single angle, the ridge orientation is designed to change progressively, allowing optimization of both aesthetic appearance and manufacturing feasibility. This dynamic approach enables steeper angles in certain regions while maintaining manufacturability in others, overcoming the limitations of fixed-angle designs.
Data Source
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AI summary
Disclosed are woven papermaking fabrics useful in the manufacture of fibrous structures, particularly wet-laid tissue products that allow the web contacting surface of the fabric to be woven with three-dimensional topography comprising protuberances that are oriented at an angle relative to both the machine direction (MD) axis and cross-machine (CD) axis of the fabric. The protuberances may be discrete or continuous and, in certain preferred embodiments, intersect one another to form discrete valleys there between. The valleys may have relatively steep sidewalls, such as wall angles greater than 22 degrees, and be relatively deep, such as valley depths greater than about 0.35 mm.