Cotton Contamination Grades That Still Reach the Blowroom
Inline blowroom optical sensors fail when poor opening leaves inclusions hidden inside dense cotton tufts, allowing synthetic polymer fibers to reach spinning frames.
Reactive Dye Synthetic White Specks
Surface Spotting
A specific surface cosmetic defect occurs when cotton fabric dyed with reactive dyes displays tiny uncolored spots across its surface. These reactive dye synthetic white specks are caused by undyed synthetic fiber contamination or immature cotton fibers that cannot absorb the dyestuff. The presence of these specks reduces the visual quality of the fabric, leading to downgrading or rejection.
Defect Cause
Synthetic microfibers from sewing yarn or cleaning rags can accidentally enter the spinning or weaving area and become spun into the yarn. When the fabric is dyed with reactive dyes, which only bond with cellulose fibers, the synthetic contaminants remain colorless. These small white points stand out against deep, dark colors such as navy or black, making the defect highly visible to quality control inspectors and garment buyers.
Production Remedy
Mills must maintain strict cleanliness in yarn spinning and fabric knitting areas to prevent cross-contamination from synthetic fibers. Using separate production lines for synthetic and cotton processing reduces the risk of fiber transfer. In addition, thorough scouring of the grey fabric before dyeing helps remove some surface loose contaminants.
Testing Analysis
Technicians examine the defective fabric under a microscope to distinguish between immature cotton fibers and synthetic contaminants. Chemical analysis can confirm the polymer type of the speck, allowing the mill to locate the source of the contamination. Tracking these occurrences helps the factory update its cleaning protocols to maintain high-yield bulk production runs.