Machine Specification
Dyeing machine specifications for jet and overflow vessels define the rate at which a continuous strand of textile moves through the treatment bath. Optimizing fabric rope circulation speed ensures that the cloth passes the nozzle at regular intervals to receive uniform chemical application. This velocity is typically measured in meters per minute.
It represents a boundary between efficient processing and mechanical fiber damage.
Flow Velocity
Drive reels and high-pressure liquid nozzles work in tandem to propel the fabric rope through the internal transport tube. When the circulation speed is set too low, the fabric spends too much time compacted in the storage j-box of the machine. This prolonged compaction leads to dye strike inequalities and permanent crease marks, commonly called crow’s feet.
Conversely, excessive velocity increases the tension on the fabric rope, which stretches the yarn and causes severe surface hairiness. The balance of nozzle pressure and reel speed must be calibrated to match the fabric weight and composition. This calibration stabilizes the movement of the rope without causing excessive pile distortion or fabric pilling.
Dyeing Efficiency
Fast-moving ropes distribute dyes and auxiliaries evenly across the fabric surface by avoiding stagnant zones. Frequent passes through the chemical injection zone guarantee that each section of the rope receives identical exposure to the treatment bath. This uniform exposure is essential for light shades and sensitive secondary colors that show thermal or chemical differences quickly.
Mechanical Stress
Delicate materials like silk or viscose require reduced speeds to protect their vulnerable wet strength. In contrast, heavy cotton and polyester blends tolerate higher speeds to shorten the processing cycle. Correct speed adjustments prevent structural degradation during the dyeing cycle.
