Carding Wire Tooth Geometry for Fiber Transfer
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Solution Overview
Problem
Existing carding machine clothing wires fail to achieve optimal fiber transfer and carding results, leading to issues such as yarn damage and uneven fleece quality, despite increased tooth density.
Innovation Solution
A clothing wire design featuring a foot section for stability and a blade section with specific tooth geometry, including first and second tooth tips and surfaces, which reduces fiber clogging and enhances fiber holding capabilities without causing yarn damage, while maintaining high performance and wear resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of tooth tips (ppsi) is increased to improve fiber transfer, then fiber transfer capability is improved, but fiber clogging and yarn damage occur
Solution Approach 1:
The patent applies local quality by creating different geometries at different locations of the tooth structure. The tooth tip features a first tooth tip surface with a specific inclination angle optimized for fiber holding, while the tooth body includes a second tooth tip surface and blade section with different geometries for fiber transfer. This localized geometric differentiation allows each region to perform its specific function optimally without causing clogging or damage.
Solution Approach 2:
The patent changes geometric parameters of the tooth structure, specifically the inclination angles of tooth surfaces and the dimensions of tooth tips. The first tooth tip surface has an inclination angle between 10°-45° relative to the longitudinal axis, while the second tooth tip surface has an inclination angle between 5°-20°. These parameter optimizations enable high ppsi operation without fiber clogging or yarn damage.
2Reliability
If blade height is increased to improve fiber holding, then fiber holding capability is improved, but fiber clogging increases
Solution Approach 1:
The patent creates a differentiated tooth structure where the blade section has a specific height optimized for fiber holding, while the tooth tip extends beyond the blade section to provide additional fiber engagement. The blade height is controlled to be between 0.3-1.5 times the tooth pitch, preventing excessive depth that would cause clogging while maintaining sufficient holding capability.
Solution Approach 2:
The patent adds a dimensional element by extending the tooth tip beyond the blade section in the vertical direction. This creates a multi-level structure where fibers can be held by the blade section and additionally engaged by the protruding tooth tip, enhancing holding capability without increasing blade height and causing clogging.
3Productivity
If tooth density is increased to improve carding performance, then carding results are improved, but wear resistance decreases
Solution Approach 1:
The patent incorporates a wear compensation feature where the tooth tip surface is designed with a specific inclination and geometry that allows it to self-sharpen during operation. As teeth wear, the inclined surfaces naturally maintain their cutting edge geometry, providing preliminary protection against performance degradation and extending service life at high tooth densities.
4Productivity
If complex tooth geometry is implemented to improve fiber transfer, then fiber transfer is improved, but manufacturing complexity increases
Solution Approach 1:
The patent segments the tooth structure into distinct functional regions: the blade section, the tooth body, and the tooth tip with its first and second surfaces. Each segment has a simplified geometry optimized for its specific function. This segmentation allows complex overall functionality to be achieved through composition of simpler, manufacturable parts, reducing overall manufacturing complexity while maintaining high fiber transfer efficiency.
Data Source
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AI summary
A wire assembly according to the invention has a foot section with a foot height and a blade section with a blade height. The blade height is less than the foot height. The blade section has a plurality of successive, geometrically identical tooth bodies. The tooth body extends between two first recesses that extend vertically as far as possible towards the foot section. Two directly successive tooth bodies are spaced apart at a distance of one pitch. A first tooth tip and at least one second tooth tip are arranged on the tooth body, the first tooth tip adjoining the first recess. A first tooth tip surface adjoins the first tooth tip, and a second tooth tip surface adjoins the at least one second tooth tip.The first tooth tip surface has a first tip surface length, and the second tooth tip surface has a second tip surface length, each with a value at least equal to the smaller of the values of 0.15 mm or 6% of the pitch. A first tooth face with a positive first working angle is adjacent to the first tooth tip. A second tooth face with a positive second working angle is adjacent to at least one second tooth tip.