How to operate overflow jet fabric dyeing machine efficiently?
Jan 15, 2026An overflow jet fabric dyeing machine operates by circulating fabric in a closed tube using high-pressure dye liquor as the primary driving force. Efficient operation depends on correct nozzle selection, balanced nozzle pressure and lifting wheel speed, and standardized process control to ensure uniform dyeing while minimizing fabric creasing and tension damage.
An overflow jet fabric dyeing machine is a continuous circulation dyeing system designed for knitted and woven fabrics. The fabric moves through a closed tube driven primarily by the kinetic energy of pressurized dye liquor rather than mechanical pulling alone.
This structure allows low liquor ratios, reduced fabric tension, and improved dye penetration, making it especially suitable for lightweight to medium-weight fabrics.
In practical dyeing production, defects such as creasing, uneven shade, and fabric distortion are rarely caused by machine defects alone. Most issues originate from incorrect coordination between nozzle design, liquor flow, and fabric traction.
Understanding the operating logic of the machine allows operators to adjust parameters dynamically based on fabric type rather than relying on fixed settings.
The nozzle is the primary energy conversion component of an overflow jet dyeing machine. It transforms pump pressure into directional kinetic energy that drives fabric circulation.
The inner diameter of the nozzle must always be larger than the rope-folded diameter of the fabric in its fully wetted state. Undersized nozzles increase fabric compression and cause permanent creasing.
| Fabric Weight | Typical Fabrics | Recommended Nozzle Diameter |
|---|---|---|
| 50–150 g/m² | Chiffon, Imitation Silk | Ø50 mm or smaller |
| 150–400 g/m² | Gabardine, T/C Blends | Ø60–70 mm |
| ≥400 g/m² | Canvas, Terry Cloth | Ø100 mm or larger |
Efficient operation requires dynamic balance between liquid traction (nozzle pressure) and mechanical traction (lifting wheel speed). Neither system should dominate.
The optimal operating state is achieved when the fabric remains naturally suspended and flows smoothly without visible tension or accumulation.
Feed the fabric at low speed to ensure stable entry and uniform tension.
Run the machine at low speed for approximately 10 minutes to confirm smooth circulation before heating or chemical dosing.
Increase temperature gradually while maintaining circulation balance. Avoid rapid heating or cooling to prevent thermal creasing.
| Fabric Type | Nozzle Pressure | Temperature Range |
|---|---|---|
| Lightweight Fabrics | 0.3–0.5 bar | 130–135°C |
| Heavyweight Fabrics | 1.2–1.5 bar | 135–140°C |
Most overflow jet fabric dyeing machines operate efficiently at liquor ratios between 1:6 and 1:8, depending on fabric type and weight.
Knitted fabrics, lightweight woven fabrics, and stretch-sensitive materials benefit most due to low tension circulation.
