Inflow Pressure Screen

Inflow Pressure Screen

NLS inflow pressure screen (foil set outside the screen basket) is a comparatively advanced screening equipment around the world in modern time, featuring high screening quality, bigger capacity and lower pulp pulse, applied to fine screening of wood pulp, straw pulp and waste paper pulp, especially as a screening equipment used before the web of paper machine.


  1. Smaller motor power, lower energy consumption but bigger capacity.
  2. Centripetal structure, low pulsation, good evenness on web.
  3. Diffusing outlet design, smooth accept flow, companion flange without spacer, inner surface polishing treatment, seamless connection of pipeline, no fiber hanging.
  4. Modular design for main motor and drive, stable and reliable structure, easy and fast installation and maintenance.
  5. Equipped with auto oiling device and mechanical sealing water monitoring and alarming device, detection sensor port reserved to transfer bearing temperature rise and vibration, high automatic level.

Working Principle

Inflow pressure screen works under pressure in a completely close state to continuously screen. When in operation, pulp slurry tangentially enters the space between screen basket and machine shell from inlet pipe at upper part of the machine body. Under force of pressure difference between inside and outside the basket, accepted pulp passes the screen holes or slots and flows into basket, then discharged through accept pipe at bottom part of machine while debris or rejects slurry failing to pass will drop to bottom and then be discharged through reject pipe. The rotating foils outside the basket produce mild pressure to improve the flow of pulp slurry and negative pressure produced from the tail end causes backflush to holes or slots to prevent fibers or contaminants from binding over the surface, thus to ensure continuous work of screen.

Technical Data

Model NLS20 NLS21 NLS225 NLS22 NLS23 NLS24 NLS255 NLS25 NLS26 NLS27 NLS28 NLS29
Nominal Area (㎡) 0.46 0.75 1.00 1.32 1.90 2.54 2.77 3.36 4.37 5.37 6.40 7.66
InletConsistency (%) 0.15-1.0
Capacity-Hole (T/D) 20-40 30-60 60-100 70-130 110-160 140-260 200-300 250-400 260-520 350-600 420-700 500-900
Capacity-Slot (T/D) 15-25 25-45 50-75 55-80 80-120 100-160 120-250 150-300 180-320 220-400 260-480 350-600
Inlet Pressure (MPa) 0.1-0.4 0.1-0.6
Motor Power (KW) 15 18.5 22 22 30 37 45 45 55 75 90 110