Mechanical Cleaning
Preparatory processing of harvested natural fibres focuses on extracting non-lint materials prior to the spinning stage. Efficient cotton trash removal eliminates fragments of seed coats, stems and leaf particles that compromise the consistency of the drawn sliver. This separation relies on density differences and centrifugal forces generated inside high-speed opening rollers.
The cleaning cycle terminates before the fibre length is shortened by excessive mechanical beating.
Fibre Quality
Over-processing in the blowroom generates short fibres and neps that reduce the strength of the final yarn. When the cotton passes through too many mechanical beating points, the protective wax coating of the fibre is stripped away. This degradation leads to increased friction during drafting and breaks on the spinning frame.
Balancing the cleaning intensity with the structural integrity of the fibre is a primary goal for the mill manager, as over-cleaned cotton always yields a weaker thread.
Processing Stage
Carding represents the ultimate stage where microscopic debris is extracted from the web. The metallic wire teeth of the card cylinder catch the remaining heavy seed particles while allowing the light cotton fibres to pass. This process also aligns the fibres parallel to each other.
The resulting sliver has a high level of purity.
Yarn Quality
Unremoved leaf fragments and seed coats cause thin places in the spun yarn and create dark spots in bleached fabrics. During dyeing, these trash particles do not absorb the colour evenly, resulting in visible fabric defects. Spectrographic analysis of the yarn detects these imperfections as periodic mass variations.
Eliminating these defects ensures the knit fabric meets first-quality standards.
