Continuous reject separators CRS are positioned in coarse screening nodes of the stock preparation line to finally separate rejects from continuous VDT or STU screen types equipped with perforated baskets.

Design

The machine is designed with a vertical cylindrical screen basket. It is assembled based on the time-proven screen STU-081 from which the frame, the drive and the bearing body are adopted as well as the unique simple and quick bearing body dismantling feature. The CRS separator differs from the STU-081 screen in the shell and the type of rotor and basket used.

The stock enters the separator through a tangential chamber placed below the basket. Heavy impurities circulating in the input chamber are caught in a heavy impurities trap. Screened stock proceeds from the input chamber upwards into a cylindrical basket inner space. The stock proceeding along the basket is supported by means of inclined rotor vanes and a guiding spiral inside the basket. The stock is washed in a unique way by water entering the rotor body. Its quantity is separately controlled. Paper fibres and water penetrate the basket perforations and are conducted through an accept output port of the machine.

Dewatered washed impurities continuously leave the machine above the basket and proceed through a reject chute to a container or alternatively, they can be thickened in screw presses. The coarse impurities separator OTN is controlled by means of automatic control.

Main parts

• Input neck (1)
• Diluting water input (2)
• Heavy impurities separator OTN (3)
• Accept output (4)
• Reject chute (5), rotor, screen basket
• Shaft bearing
• Drive frame (6) with a belt gear
• Electric motor (7)

Material

• All parts coming to contact with the stock are made of stainless steel
• Other parts are made of structural steel and coated