Since the time I have demonstrate that the degree of leveling depends of the interaction dye bath / dyeing good, one of the biggest sales arguments for new dyeing machines is the fact that either the speed of the pumps or / and the speed of the ropes is increasing from one day, theoretically correct, but practically incorrect. Everybody runs rash as a basic warranty of good leveling. Additionally: it sounds good: it is on line with the postulate: rapid dyeing.

I like to repeat it again and again: rapid or economical dyeing? Because rapid dyeing with the security to have 100% RFT, that would be the dreamed goal (if the material allows it!), but rapid dyeing with additional shadings and some reworkings becomes no more the sense of rapid: it is no more economical.

But that is not only the main question.

We have to be very conscious that increasing speeds is not the only way to ensure good leveling, because the mechanical and hydraulically forces developed by such speeds, could put in danger the integrity of the treated textile material.

Another integrity is also in danger with high speeds: the integrity of the physical  stability of the products used, specially stability of dispersions and emulsions. A lot of levelness problems have to do with "high speed" of pumps and/or fabrics.

I would explain it in the following updating.