Centrifugal pressure screen – knotters OPS homogenise flowing stock before paper machine headboxes and at the same time they protect them from accidental impurities. The design of centrifugal knotters enables a high throughput thanks to a shell shape optimisation bringing a constant flow velocity through the screen and having a positive effect on eliminating fibres entrapment on the screen. The knotter shell is optimised in terms of low output pulses and prevents formation of deposits thanks to polished surfaces after the screen. Another benefit is a unique deflector in the inflow chamber improving the throughput and reducing energy demands.

Design

The OPS design has a compact closed kind with a vertically placed cylindrical screen wiped from inside by a turning lowpulsation rotor. Small sized knotter drives are placed on frames while the larger ones are placed on concrete foundations. A great advantage is an easy service due to the possibility of removing bearing body away without dismantling the belt pulley.

Machine design and work safety are in compliance with the EU standards and EAC.

Main parts

• Body (1) with vertical cylindrical screen (2)
• Inflow part (3)
• Outflow part (4) with polished surfaces after screen
• Lid with deflector (5)
• Low-pulsation rotor (6)
• Frame with belt drive (7)
• Electric motor (8)

Material

• All parts coming to contact with the stock are made of stainless steel
• Other machine parts are made of painted common structural materials