Desizing Weight Loss

Treatment Chemistry

Sizing chemicals are applied to warp yarns to protect them from breaking under the high tension of the loom. After weaving is complete, these starches must be broken down and washed away, resulting in a predictable desizing weight loss. This removal usually employs enzymes like amylase for starch or hot alkaline washes for synthetic binders.

Complete elimination of these agents is necessary to prevent patchy dye absorption or stiff hand-feel in the finished garment.

Quality Control

Measuring the difference in dry mass requires precision and standardized oven-drying methods to avoid errors from ambient moisture. In the laboratory, the target desizing weight loss depends on the yarn type and the original size formulation, usually ranging from four to fifteen percent of the fabric’s initial dry weight. If the measured loss is too low, it indicates that sizing residues remain, which will block dye molecules during the next phase.

Conversely, excessive loss might suggest fibre degradation from harsh treatment chemicals. Technicians utilize these measurements to fine-tune the temperature and chemical concentrations of the continuous washing lines.

Production Effect

Uncontrolled residual sizes can ruin entire production runs by causing uneven colouration and poor finish consistency. Achieving the correct desizing weight loss allows mills to proceed to bleaching and mercerizing with confidence. It optimizes chemical consumption by ensuring that subsequent baths are not contaminated by dissolved sizing polymers.

This monitoring step is essential for maintaining high-quality fabric standards in industrial textile finishing plants.