Recycling system for extrudet products

In pet food and aqua feed plants the extruder is stopped for size and recipe change this means that the start and the end of the production is not used for finished product.

This start up/stop material do have a high water activity and cannot be stored without drying and bringing the water activity down to avoid bacterial growth.

The recycling system  is based on :

  • Intake conveyer
  • A mixer using hot air for drying
  • Heat exchanger for heating up the drying air
  • Fan for the drying air
  • Filter
  • Separate control system



The product is delivered to the system from a delivery chute into a mixing / drying chamber. The drying takes place in the mixing chamber where a disintegration of the startup mass takes place together with hot air drying. The hot air is produced by a heat exchanger. The exhaust air is treated in the local odor reduction system. The finished dried powder Is transferred to the rework silo.

Drying and mixing time, air temperature is controlled by the integrated control box.

recycling-unit-wet-extruder-topTechnical specifications

Type:                               Hot air batch dryer

Product:                          Wet start up material from extruder

Capacity:                          770 –  1320 lbs./batch
(Depending on density)

Drying time:                    1-2 hours depending water content in the start up material

Overall dimensions:       LxWxH         13,1 ft. x 13,1 ft. x 14,8 ft.

Transport volume:           20 ft. Container

Weight:                              8800 lbs.

Motors:                              4 pcs (Total 23,4kW)

Steam:                                660 lbs/hr (73 psi)

Compressed air:               40 gal./min (88 psi.)

Exhaust air:                       88000 ft3/hr