Dewatering machines OK-Z when produced as thickeners are designed for dewatering of all fibrous stocks in the pulp and paper industry, especially for continuous dewatering.

Dewatering machines (circular) OK-F when produced as filters are designed for cleaning waters full of fibres in the pulp and paper industry.

Design

Dewatering machines, provided with a pickup roll, are used particularly for continuous thickening under stable input conditions.
The machine capacity depends on the sort and mainly on the dewatering speed or refining rate of fibrous stock and its input consistency. The OK family provides capacities ranging from 15 to 250 tpd. A dewatering drum, covered with a plastic shrinking wire, is permanently rinsed with washing water from shower pipes with flatshaped jets.

Water with solid content up to 50 mg/l can be used to spray the screen because the shower pipe is provided with a cleaning brush. Washing water consumption is usually ranging from 40 to 70 l/min for one meter of shower pipe. The input consistency is approx. 0.5 to 3.0 %, depending on the type of processed raw material (see the graph), the output consistency is approx. 5 to 9 %. Machine design and work safety are in compliance with the EU standards and EAC.

Installation of the screen “PAPSCREEN”

Main parts

• Chest with overflow (1): cleaning chest covers, outlet necks, discharge of thickened stock and filtrates
• Dewatering drum (2) covered with screen and drum packing band
• Steel pick-up roll with rubber coating with loading regulation and doctor (3)
• Shower pipe with nozzles and inside cleaning brush (4)
• Electric motor with gearbox (5) controlled by frequency converter

Material

• All parts coming in contact with the stock (chest, regulating overflow, drum bearing structure and drum chutes) are made of stainless steel
• Drive parts are made of high-grade steels protected against corrosion with polyurethane coating
• The pickup roll is made of structural steel, covered with a rubber coating