During a single inside-out flow process, dye liquor discharged from the pump enters the carrier and passing through spindles, then reaches the packages and diffuse towards surface outside. It is required only a sufficient water level at the kier bottom to maintain steady pump operation and not necessary to have all packages immersed with liquor, hence achieving a lower liquor ratio.

Owing to the reversal function on traditional yarn dyeing machines, the packages could be expanded and contracted by pressure changes during switch of flow, hence increasing the effectiveness and evenness in dyeing. Since the single flow concept has no flow reversal feature, the pump should vary its speed to generate pressure difference according to specific principles. By executing a Specific period of change in pump frequency, smashing the packages like waves such that it could move under differential pressure and achieve quality dyeing like the conventional
bi-directional flow. The change in pump frequency also indirectly provide power savings.

With low capacity but maintaining the dyeing effectiveness almost the same as production machine. Ensures high reproducibility.

Directly heated by electrical heater rather external steam heating coil and compact configuration make the installation easy.

Small size around 1 meter in dimension, convenient to be operated on workbench.