The function of the Intensive Washer in polymer recycling, is continuous cleaning and simultaneous drying of ground material within one piece of equipment.
The Intensive Washer is used particularly in plants that have already been equipped with pre cleaning, but where moist contamination adhered to the surface of the material is to be subsequently removed.
Intensive Washer
Operating method of the Intensive Washer
Method of operation:
Ground material enters the Intensive Washer (ideally, via a pre-soaking screw). Water is added at the entrance to the machine and transported to the rotor area. Here, a robust rotor mixes the material and spins it so that it reaches the outer sides of the Intensive Washer through centrifugal force. Alternating spray equipment (for cleaning) and screen linings (for drying) are mounted on the outer sides. The material is therefore washed and dried a number of times.
FRICTION SEPARATOR
A friction separator is the ideal choice for highly contaminated plastics to be treated in the recycling process. Friction separators are often used to clean mixed plastics and for highly contaminated films.
Method of operation:
The friction separator consists of a long, rapidly rotating rotor that cleans through horizontally or vertically conveying ground material; with water, to a basket screen. A high level of friction is produced due to the high rotation speed and the design of the rotor. The basket screen and the rotor are continuously cleaned by the addition of water against the direction of product flow, so that the friction washer always remains clean.
CONTINUOUS HOT WASHER
Plastics with strongly adhering contamination or with high demands on quality are treated with the continuous hot washer.
Method of operation:
The hot washer consists of a tank filled with a caustic washing solution in which an insert rotates with a circulatory movement. This insert consists of a number; depending on the required throughput, of individual washing chambers that are filled and emptied by a revolving principle.
A predetermined amount of ground material is introduced into a washing chamber via a dosing screw. A defined amount of the caustic solution is contained in the washing chamber and is continuously moved by a propeller.As in a carousel; when one washing chamber is full, the insert rotates to the next container and so on. The circulatory movement determines the amount of time the ground material remains in the caustic solution, until it is discharged from the carousel.
A dewatering screw is located at the point of release, which transports the emptied ground material away from the caustic washing solution and brings it in a dripping wet state to the next process stage.
A cleaning circuit is connected to the hot washer to continuously clean the caustic washing solution. The entire amount of the caustic washing solution is exchanged 2.5 times per hour. This involves the pumping out of the caustic washing solution from the hot washer for cleaning in a decanter.
The cleaned caustic washing solution returns to the hot washer after passing through a heat exchanger.
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Plastics with strongly adhering contamination or with high demands on quality are treated with the continuous hot washer.
