The bulk cotton fibers used for spinning contain natural pigments, neps, impurities, pectin, and waxy substances when untreated. The raw fibers lack whiteness and contain many impurities. Direct spinning can lead to dull yarn color and uneven yarn consistency, affecting the quality of subsequent dyed yarn and yarn-dyed fabrics. Unlike formed fabrics, bulk fibers do not have a fixed fabric surface morphology and cannot be processed using conventional roll-to-roll and flat-bed equipment. The continuous bleaching and washing machine for bulk fibers is specifically designed for the pretreatment process of loose fibers.
The equipment adopts a permeable mesh belt conveyor structure, with loose cotton fibers evenly spread on the surface of the mesh belt, which is conveyed at a constant speed and smoothly throughout the entire process, without squeezing or tangling, preserving the natural fluffy state of the fibers. The fibers pass through the liquid medicine infiltration, constant temperature steaming reaction, and multi-stage spray water washing units in sequence, allowing the bleaching liquid to fully penetrate into the fiber layer, decompose the natural pigments and organic impurities contained in the fibers, and reduce the natural yellowing of the fibers. The steaming section provides a stable environment for impurity reaction, ensuring uniform and consistent bleaching effect.
The spray rinsing structure penetrates the fiber layer from both top and bottom, thoroughly washing away impurities, decomposition products, and chemical residue, thus avoiding the impact of localized chemical accumulation on fiber quality. Workers can adjust the mesh belt speed, chemical concentration, and rinsing duration based on fiber thickness and spreading density, ensuring that each layer of fiber reacts fully and is thoroughly cleaned. The equipment facilitates continuous bleaching and rinsing of loose fibers. The processed cotton fibers exhibit uniform whiteness, low impurity content, and consistent cleanliness, providing high-quality raw materials for subsequent loose fiber dyeing and high-end yarn spinning.