Purpose of processing
Dyeing process, with partial filling of the machine, which provides for two circulation systems
of the fabric.
The first, with liquor and fabric circulation, has nozzles above or below the surface of the liquor.
The second, for delicate and light fabrics, less powerful nozzles and circulation aided by a reel.
It is a pressurized machine, with 1 or 6 strings, which allows the dyeing of polyester fibers and
synthetics in general, including wool blends.
Processing technology
We describe a modern machine with a controlled reel, for its completeness and variety
of use, which allows both the classic dyeing process and other operations.
The collateral air circuit makes it possible to vary the system and circulation speed of the piece
in the bath based on the heaviness and structure of the fabric and to operate in bath only, in air and bath
or with air alone.
Process in bath only (see figure A, path A light blue):
the patch is introduced through the porthole (fig. A, point 1); it then passes directly into the nozzle (fig. A, 2),
carried with the bath towards the bottom of the tub which functions as a relaxation chamber (fig. A, 3), passing
in rope above the controlled reel (fig. A, 4), it is sewn with the next piece in the spin,
thus starting the cycle.
The bath is prepared in a tank (fig. A, 5) external to the machine, sucked in by a pump
circulation (fig. A, 6) and introduced into the drum through the nozzle. Once the solution is used up, they are closed
the valves and the circulation of the bath begins which continues from the bottom towards a filter, sucked from
circulation pump and pushed by it into the nozzle.
Air-water process (fig. A, path A blue + B red):
Same loading system; the flow of air increases the penetration of the dyebath
on the fibers and, by moving the fabric, it reduces the probability of creases or abrasions, especially
on delicate fabrics such as linen blends, lycra blends, etc.
Process with air only (fig. A, path B red):
It is used when the dyeing is complete; the circuit is cut off through a special damper or valve
circuit of the bath on the thrust nozzle, replaced by the tissue treatment circuit, engaged
on the air circuit and carried out with suitable auxiliary products. This process can only be run on
some specially prepared machines.
Execution of the work and the most recurring defects
Please refer to what is indicated for overflow dyeing (sheet 18).
