Chemical Scouring
Inorganic acid addition represents a precise adjustment of wash water pH to remove metallic ions and residual salts from raw flax fibres during the wet processing stage of linen manufacturing. Citric acid dosing requires constant monitoring of conductivity and hydrogen ion activity to ensure that the cellulose remains unharmed while mineral buildup on the rollers decreases. This intervention prevents uneven dye uptake and preserves the tensile strength of the individual strands.
Operational Parameters
Technicians calibrate the supply pumps based on the total alkalinity of the incoming water source and the target acidity levels required for the specific linen batch. Accurate citric acid dosing mitigates the risk of calcium precipitation that otherwise causes brittleness in the yarn during spinning. Operators adjust the flow rate whenever incoming water quality shifts or when the mill switches from flax fibre processing to woven cloth finishing.
High concentration levels lead to premature degradation of the textile structure. Excessive application results in an acidic residue that interferes with the crosslinking of softening agents applied in subsequent mechanical cycles. Regular calibration of the automated injectors ensures that the mill maintains the required neutral to slightly acidic range without exceeding the chemical tolerance of the fibres.
Compliance Verification
Laboratory analysis of the outflow water verifies that the mineral removal process occurred within the specified threshold documented in the internal quality control file. The technician measures the residual concentration after the final rinse to confirm that the citric acid dosing maintained the structural integrity of the treated flax. A deviation from the acceptable pH range alerts the plant manager to a potential malfunction in the dispensing hardware or a change in the chemical composition of the feedstock.
Correct execution of this procedure ensures that the final fabric achieves the softness and dye receptivity demanded by the final market export standards. Consistent control of these values protects the mill against batch rejection by external buyers.
