Chemical Exposure
Temporal parameters determine the duration that textile materials interact with processing fluids in a treatment tank. The residence time for flax during the scouring stage must be long enough to dissolve waxes without degrading the cellulose. If the material moves too quickly, the chemicals cannot penetrate the dense bundles.
This duration is controlled by the speed of the conveyor belt or the rate of liquor circulation.
Reaction Completion
Sufficient time is required for molecular bonds to break and reform during bleaching or dyeing. Short residence time results in patchy colouration and incomplete removal of impurities. If the period is too long, the caustic soda may weaken the fibres.
Monitoring this variable is essential for maintaining the tensile strength of the linen fabric.
Throughput Control
Production volume depends on the balance between processing speed and the physical volume of the treatment chambers. Because residence time is inversely proportional to flow rate, any increase in speed must be matched by a longer path for the material. Modern mills use automated sensors to track the passage of fabric through the range (often using infrared technology).
Efficiency improves when the dwell time is optimised for the specific weight of the cloth. Every meter of fabric must experience the same conditions to prevent shade variations. This requirement limits the maximum throughput of the production line.
