Machines for Bleaching


Machine for the scouring and bleaching of flax sliver on cops

Casto integrates degumming and bleaching processes in one single machine. Such integration leads to a more efficient planning of the entire production.

The modular stainless steel loading carriers are designed in such a way they are easily transportable with standard transpallets and can replace the traditional trolleys. The operators can load the loading carriers directly instead of the trolleys and reach the degumming/bleaching machine through the lanes of the spinning and roving departments without interrupting the operation.
This entirely avoids traditional cop rehandling during scouring, which consists in unloading the trolleys and loading the carriers.

The pump is specifically designed to operate at low head pressure and high flow rate, as required by the
soft winding of sliver cops which need very smooth circulation to prevent felting, which would cause spinning troubles and defects.
The unique design of the plant is not limited to the sole pump, but it is also extended to the entire circulation system, such as the intake manifold (liquor flow out-to-in), axial impeller pump, delivery manifold (liquor flow in-to-out), carrier seats and carriers. A smooth and solid liquor circulation with a limited pressure drop is obtained and this means low installed power.

Casto can accommodate 8 modular carriers suitable for sliver cops of various standard sizes.
The electronic control of the entire process can be limited to controlling time/temperature parameters by modulating pneumatic valves and manual control of on-off interception valves.
Alternatively, by using a dedicated controller, it can manage all the valves and electrical equipment thereby obtaining a fully automatic cycle and significantly reducing operating costs, with outstanding repeatability and reliable results.

Due to the use of special pumps, combined with a complete automation of the very short productive cycle, Casto brings a substantial reduction of electric consumption and global savings of running costs for degumming and bleaching. The increased working efficiency of the spinning machines is furthermore guaranteed by the complete elimination of any intermediate handling by means of cops directly loaded on loading carriers,
with consequent benefits in terms of manpower and process times.


Vertical machine for dyeing bobbins, tops, bumps, staple, tow

Introduced on the market in the early 80’s, the pressurized air-pad system is part of the RBNVI as well as of all other machines in our portfolio. The implementation of such technology makes it possible to achieve great advantages by flooding just the pump and the packages alone, thus significantly reducing liquor ratio (1:6) and lowering the global consumptions of water, steam and electric energy.

The use of the air-pad system ensures an unaltered liquor ratio even when the machine is loaded at 50% of its nominal capacity.
The variable loading logic (100-50%), along with the automatic system for the continuous monitoring of the differential pressure between the inner and outer portion of the material, guarantees total flexibility of the machine in regards of the material (cotton, polyester, wool, blends, etc.) and its relative configuration (packages, tops, tow, loose fiber).

By means of the helico-centrigfugal pump designed by Loris Bellini, the amplitude of the spectrum of available differential pressure (0.2 to 2.5 bar) gives the opportunity of dyeing very different fibers within the same machine, from acrylic to wool with excellent permeability, to cotton and viscose with reduced permeability,
as well as very dense packages of polyester.

The flow reversal device, which is integrated in the pump, does not require to slow down the liquor circulation
at each inversion (thus preventing peak absorptions) and avoids the formation of turbulence within the dye bath.

The machine can be configured in different ways depending on the materials that need to be dyed — such as high temperature drain, linear/exponential alkali dosing system, preparation/recovery tank — which are all managed by the Leonardo system installed on a industrial PC.

The air-pad system, combined with an extremely compact hydraulic circuit, ensures very low figures for the liquor ratio.
This leads to global savings of water and chemical products, with a consequent reduction of production costs and a faster payback over the initial investment.


Laboratory machine

End users consider our RBNVI/PULSAR 270 as a very useful machine between the actual lab and the industrial production.
This machine benefits of all the same peculiarities of a proper production machine and it consequently gives the possibility to work on a sample of material adapting the same parameters and the same configuration of bulk production (1 or more packages).

Despite its very compact design, RBNVI/PULSAR 270 is equipped with all the devices available for larger industrial machines. In virtue of such full configuration, this machine is meant for working on small lots and their respective cycles to be consequently transferred to the bulk production.

RBNVI/PULSAR 270 is pressurized at 5 bar and has a working temperature of 140°C.
Complete with electronic sensors, probes and pneumatic/automatic valves, this machine can go through the different phases of the dyeing cycles in an automatic way by means of our process controller Leonardo 600.

Considered as a true “bridge” machine, it allows the transition between the laboratory stage and the production, thus minimizing the risk of error on the final product and assuring savings on production costs.

The availability of specific loading carriers for packages — but also for hanks, loose fiber and small tops — makes this machine a true support for a more efficient management of the dye house.