Card Clothing Wire Undercut Geometry for Higher Web Grammage
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Solution Overview
Problem
Existing carding machines face a trade-off between producing nonwoven webs with high grammage or high quality, as increasing tooth depth typically enhances grammage but reduces quality, and vice versa.
Innovation Solution
A card clothing wire with reduced tooth depth, featuring an undercut and overhanging tips, is used on the doffer or worker, allowing for improved fiber retention and production of nonwoven webs with both increased grammage and quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If tooth depth is increased to enhance grammage, then nonwoven web grammage is improved, but web quality deteriorates
Solution Approach 1:
The patent applies parameter changes by reducing the tooth depth from conventional depths (2.0-3.5 mm) to a specific range of 0.5-1.5 mm. This parameter modification enables the card clothing wire to achieve both increased grammage (up to 50%) and maintained quality, resolving the traditional trade-off between these two parameters through optimized dimensional specifications
Solution Approach 2:
The patent applies local quality by introducing an undercut feature at a specific location on the tooth structure. The undercut is positioned at the base of the tooth where it contacts the fiber web, creating a localized structural modification that enhances fiber retention without increasing overall tooth depth, thus improving grammage while preserving web quality
2Manufacturing precision
If tooth depth is reduced to improve quality, then web quality is improved, but grammage decreases
Solution Approach 1:
The patent applies parameter changes by establishing a specific tooth depth range of 0.5-1.5 mm that is shallower than conventional depths. Combined with the undercut feature, this parameter modification achieves both improved web quality and increased grammage (up to 50%), reversing the traditional inverse relationship between tooth depth and grammage
Solution Approach 2:
The patent applies local quality by positioning the undercut at the critical contact zone between the tooth and fiber web. This localized structural enhancement provides superior fiber retention at the specific location where fibers are picked up, enabling quality improvement without sacrificing grammage
3Ease of manufacture
If conventional card clothing wire design is used, then manufacturing is simple, but fiber retention is insufficient
Solution Approach 1:
The patent applies local quality by adding an undercut feature at the base of the tooth where fiber contact occurs. This localized modification enhances fiber retention through improved mechanical interlocking and friction at the critical contact zone, while maintaining overall tooth structure simplicity for ease of manufacture
Solution Approach 2:
The patent applies parameter changes by specifying precise dimensional parameters for the undercut (depth: 0.1-0.5 mm, width: 0.5-2.0 mm, angle: 30-60 degrees) that optimize fiber retention. These controlled parameter modifications enhance reliability while remaining compatible with conventional manufacturing processes
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The proposed card clothing wire design, with a tooth depth of less than 1.7 mm and undercut features, significantly increases nonwoven web grammage by up to 50% while maintaining or improving quality, contrary to conventional wisdom.
Implementation Method 1
The undercut is spaced apart from the tip and abuts on the edge-face segment. The edge-face and the undercut both form an angle with the rib portion, wherein the angle between the undercut and the rib portion is smaller than the angle between the edge-face and the rib portion. Thus, they form an overhanging tip.
Data Source
AI summary
A card clothing wire is disclosed, especially for a doffer or a worker of a carding machine, which provides a superior retention of fibers during a carding process and which can be universally used to produce nonwoven webs with an increased grammage or to produce nonwoven webs with a low grammage and an increased quality. In one form, the card clothing wire includes a tooth depth of less than 1.7 mm and an overhanging tip with an undercut.