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ARAO – ARAV High flowrate atmospheric dryer

Arao and Arav are fully automatic yarn package high flowrate dryers at atmospheric pressure conceived to load directly the dyeing carriers coming from dyeing machines, after hydroestraction.
The dryer performs the final drying of yarn packages after a preliminary centrifugal hydroextraction.
They are normally used to dry several types of yarns without practical limitations in:

  • Fibre composition
  • Yarn package type and size.

Yarns can be of cotton, acrylic, wool, polyester, rayon and blends in form of cylindrical, conical, biconical, compressible packages.

HIGH DRYING PERFORMANCE

Arao and Arav dryers are rated to operate at atmospheric pressure with a high Dp and flowrate in order to reduce the drying time and to obtain the best quality in the subsequent yarn working processes.
ALL OPERATIONS ARE PERFORMED IN A OPEN AIR CIRCUIT consisting of:

  1. Autoclave designed to receive the modular yarn package carrier (s).
  2. Inlet air filter to avoid external air pollution (available “absolute filter” in option)
  3. High-efficency centrifugal blower
  4. Indirect air heating battery
  5. Weighing system (available as option)

Electric control panel with PC for fully automatic operation.
The complete drying operation is performed automatically after hydroextraction by centrifuge.

The drying process duration is controlled automatically by means of:

  • Time
  • Automatic weighing and moisture rate pre-setting system

AUTOMATIC CONTROL OF RESIDUAL MOISTURE

The device is conceived to operate as below:

  • During drying operation, through a specific hardware system, the carriers loaded with yarn packages are weighed directly in the autoclave.
  • A separate software system allows to equalise the residual humidity in yarn packages with pre set moisture rate.

This system avoids any risks of over or poor drying, typically linked to traditional drying systems such as those of pre set end of cycle, or control of final temperature rate when air is eliminated through exhaust air circuit.

OPEN LOOP AIR CIRCULATION SYSTEM

The using of the open loop circulation system consists of the following items in sequence:

  • FILTER : the pollution of the filter is continuosly monitorized by a differential pressure manometer that shows when to chance the filter itself.
  • BLOWER: hi Dp and flowrate blower, optionally controlled by inverter in order to maximize the Dp and the flowrate as needed, in order to reduce the drying time.
  • HEAT EXCHANGER: the air flow passes through the battery only once in order to avoid the polluting effect of air recycling.