Loris Bellini
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APPC-LV Pressure dyeing cabinet loaded with special drawers

The APPC-LV cabinets have set new standards in flexibility, reliability and automation.

FLEXIBILITY

  • Variable loading system at constant liquor ratio
  • Fully interchangeable loaders for hanks of different reeling diameters
  • Continuous liquor flow rate regulation system by Inverter

APPC-LV pressure cabinets use fully interchangeable loaders for dyeing hanks of different lengths in the same machine.

  • “HB” HANK LOADERS
  • “COT” HANK LOADERS FOR MERCERIZED COTTON
  • DRAWERS FOR PANTYHOSE

AUTOMATIC AIR-PAD PRESSURIZATION

APPC-LV cabinets operate at 0.4 bar static pressure up to 110°C temperature.
Static pressure is obtained by a compressed air pad in the zone above the dyeing liquor.
The air-pressurized zone acts as expansion chamber for the increase of liquor volume during temperature rise or additions of dyes and chemicals and occupies approx. 25% of internal volume.
Air-pad pressurizing has a large number of practical plus-points:

  • EXPANSION VOLUME INSIDE THE CABINET
  • LOW WATER-STEAM-POWER CONSUMPTION
  • SAFE DYEHOUSE ENVIRONMENT
  • DYES AND CHEMICALS DIRECT INJECTION
  • PERFORMANCE

LIQUOR RATIO CONTROL SYSTEM

The main advantage of APPC-LV pressurization system is that liquor volume and loading rate are automatically controlled.
Machine filling is done by continuous automatic level probes or electronic liter-counter.
The dyer can operate the machine with the best-suited liquor ratio.
Liquor ratio parameter is perfectly repeatable batch-to-batch and controlled based on dyestuffs solubility and process phase.

  • LOW DYEING LIQUOR RATIO
    Material is completely immersed in dyeingliquor with bidirectional flow. Low liquor ratio saves large dyeing costs in process water, steam and all chemicals added at fixed concentrations based on liquor volume.
  • HIGHER LIQUOR RATIO DURING WASHOFF
    During wash-off phase after dyeing the higher liquor ratio reduces overall water consumption due to higher solubility and rapid removal of unfixed dyestuffs and chemicals.
  • MAXIMUM LIQUOR RATIO DURING OVERFLOW RINSE
    Clean rinse water is fed from the bottom of machine and after filling the dyeing chamber it is drained by a separate overflow let-off valve. Overflow rinse can be controlled and reproduced either by time or volume by automatic liter-counter.

VLS VARIABLE LOADING SYSTEM.

The outstanding operating flexibility of APPC-LV is enhanced by use of interchangeable hank loaders for dyeing:

  • Hanks of different sizes and reeling circumference.
  • Dyeing of half-loads at nearly constant liquor ratio and flow rate/kg

Continuous level controls enable filling of water to flood the yarn hanks regardless of their size.
Interchangeable loaders establish the recycling height by the height of their rear wall.
Liquor circulates between rear wall of loader and rear wall of chamber.
Liquor circulation pump is controlled at stepless speed by Inverter (AC power frequency converter) to obtain a constant value of liters/kg/minute.

FLOOR INSTALLATION

APPC-LV is installed at floor level without foundations.
APPC-LV does not require underground excavations. Hank loading at reeling stage and unloading at drying phase are done at ergonomical height.
Circulation pump and all components subject to maintenance are fully accessible from all sides.
The pump is engineered for rapid online change of mechanical seals in a matter of minutes with no downtime or production losses.