RBNV-I, as all Loris Bellini dyeing machines, is Air Padded since the beginning of the 50’s. RBNV-I dyeing machine can be pressurized at 5 Bar at low liquor temperature.
The relevant advantages to this solution are:
Ecology and environment:
NO external Expansion Tank means no emission of chemical vapours.
NO external Expansion Tank means no continuous external circulation, thus liquor expansion volume realized directly into the autoclave.
means of single tank or a multi tank colour-kitchen.
Liquor ratio is adjustable to optimize processing condition, by means of automatic liquor level control.
Level control is of continuous type and liquor level can be preset along the full height of the kier.
RBNV-I operates at:
Low liquor ratio during dyeing saves process water, steam and auxiliary products added in fixed concentrations in relation with liquor volume and determines economical dyeing costs.
RBNVI machine can work at: Half load, Reduced load or Full load.
The variable loading system OPERATES ON ALL KINDS OF MATERIALS to be dyed, as rigid or compressible yarn packages, tops, bumps, loose stock, tow, with the adoption of interchangeable modular dyeing carriers. Pump flow rate is regulated to remain constant at reduced load.
The AUTOMATIC COUPLING SYSTEM with total liquor exchange among two or three RBNV-I machines permits to extend the flexibility for dyeing of large batches even further.
The heart of RBNV-I dyeing machine is the extremely efficient HELICOCENTRIFUGAL type liquor circulation pump, which is a mixed design between an axial and a centrifugal impeller, specifically designed to cover the complete range of differential pressures (Delta P) from 0.2 up to 2.5 Bar.
Automatic reversal of liquor flow direction is performed at preset time intervals by means of a special Flow Reversal Device integrated into the pump and consisting of a rotating elbow which slides sideways the delivery mouthpiece from inside-out (I-O) to outside-in (O-I) direction and vice versa. Precision positioning of reversal curve is originated by a combined pneumatic-oleodynamic system (PC), in order to perform a very smooth liquor flow reversal without hammering effects.
Liquor flow reversal is made with motor in operation in order to avoid peak power absorption due to delta-star motor restarting.
The circulation pump is equipped with cooling-free mechanical seals.
The helicocentrifugal pump has been entirely engineered by Loris Bellini, and each one is tested on our own computer controlled pump testing centre.