Mechanical Volumetric Dosing Calibration for Textile Pad Dyeing Systems
Mechanical volumetric dosing calibration requires gravimetric cross-verification and pressure-balanced manifolds to prevent shade tailing in pad dyeing.
Pickup Percentage
Liquid Retention
Ratio of the weight of the finishing solution absorbed by a fabric to the dry weight of that fabric is a fundamental measure of application efficiency. The pickup percentage determines the amount of active chemical that remains on the goods after they pass through a padder or a spray booth. It is calculated by weighing a fabric sample before and after the impregnation stage.
This value determines the concentration of chemistry required in the supply tank.
Application Control
Precision in the chemical dosage depends on the ability of the machinery to maintain a constant pressure on the squeeze rollers. If the pickup percentage varies, the concentration of the flame retardant or softener will be inconsistent across the width of the roll. Operators adjust the nip pressure to hit the target value.
Sizing Uniformity
Consistent coating of the warp yarns is necessary for the weaving process to run without interruptions. A low pickup percentage during sizing results in a brittle yarn that breaks under the tension of the loom. High pickup leads to sticky yarns that do not separate easily in the shed.
Drying Efficiency
Energy consumption of the factory is directly linked to the amount of water that must be evaporated from the treated material. Increasing the pickup percentage requires more heat and a slower line speed to ensure the fabric is completely dry. Modern mills use vacuum extraction to reduce the liquid load before the oven.