Refinement Process
Chemical or mechanical procedure used to remove proteins, waxes, pectins, and minerals from raw plant fibers. Execution of non-cellulosic impurity extraction is a prerequisite for achieving high levels of whiteness and dye affinity in cotton fabrics. The process stops once the fiber reaches the desired level of cellulose purity for the specific end use.
Treatment Method
Scouring involves the use of heat and alkaline solutions to break down the natural protective layers of the fiber. Enzymes are sometimes added to target specific proteins without damaging the underlying structure. As non-cellulosic impurity extraction proceeds, the fiber becomes more absorbent and more responsive to subsequent bleaching treatments.
Rinsing follows the chemical bath to ensure that no residues remain on the surface of the yarn.
Quality Result
Efficiency is measured by the change in the weight and the wettability of the material. A successful process results in a fiber that can absorb water almost instantly. If non-cellulosic impurity extraction is incomplete, the fabric will show resisted areas during the dyeing phase.
This leads to a blotchy appearance and poor color fastness in the final garment.
Process Stage
Preparation happens most frequently at the fabric stage but can occur in the yarn or loose fiber form. High end shirting mills often perform a double scouring to ensure a perfectly smooth surface. Because non-cellulosic impurity extraction consumes significant amounts of water and energy, modern mills use closed loop systems to recover heat and chemicals.
This checkpoint is essential for ensuring that the textile meets the technical specifications for industrial or medical use.
