Bottle Wash Press

Objective:

Remove and dewater all pulp stock mixed in with the Caustic Soda Wash bottle wash stream.

Return the caustic soda back into the bottle wash stream.

Mixed in with the label pulp stock is, broken glass, bottle caps etc.

Receiving the Caustic Soda Stream from a hinge conveyor and or Disco strainer at the lower end of the press conveyor. The free standing liquid is evacuated through a fine wedge wire drain the pulp stock sits on top of the wedge wire where the spiral sweeps the pulp forward transporting the pulp towards the press end. The press end consists of a dewatering basket, a spray wash system to keep the basket free from debris ensuring the dewatering galleries are kept open and that material can be de watered.   

The wash water system is on timers, it is important that the minimum amount of water is used at all times, first to ensure that no new water re moistens the dewatered material, secondly to limit the dilution of the caustic soda returning to the stream.

 

Using a shaftless screw in this application has the benefit of a full screw feeding the dewatering zone. Maximizing the dewatering efficiency of the press. The standard press end had to be modified to make sure that the center core would dewater at the same rate as where the spiral flight presses the material against the pneumatically operated door. This modification forces the wet material running through the centre core to be forced outward, so the spiral will pick it up and dewater at the same place and rate as the rest of the material. 

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