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NLS Series Inflow Pressure Screen


NLS series inflow pressure screen is advanced paper pulp screening equipment in the modern world, which has great ability of screening function and low pulse. It is widely used in the fine screening of wood pulp, straw pulp and waste paper pulp, especially suitable as the net filter before paper machine.

Application & Features

  • Small motor power, high production capacity, energy saving.
  • Inflow structure, low pulse, good effect of homogenate.
  • No gaskets companion flange pulp outlet, inwall is polished. Seamless connection of flow pipeline, no fiber hitching.
  • Advanced structure, sturdy and durable, convenient disassembly and assembly, simple operation, less malfunctions for continuous working, low maintenance cost.
  • Long pulping residence time, sufficient fiber relief, low rate fine fiber loss.

Main Specification

Type NLS0.6 NLS1 NLS1.5 NLS2 NLS3
Screen Area (m2) 0.6 1 1.5 2 3
Concentration of Input Pulp(%) 0.4-08
Capacity (Screen Hole) (t/d) 30-60 70-130 110-160 140-260 250-400
Capacity (Screen Slot) (t/d) 25-45 55-80 80-120 100-160 150-300
Pressure of Inflow Pulp(mpa) 0.1-0.4
Motor Power (kw) 7.5-15 22 30 37 45
Screen Area (m2) 4 5 6 7
Concentration of Input Pulp(%) 0.4-0.8
Capacity (Screen Hole) (t/d) 260-520 350-600 420-700 500-900
Capacity (Screen Slot) (t/d) 180-320 220-400 260-480 350-600
Pressure of Inflow Pulp(mpa) 0.1-.0.4
Motor Power (kw) 55 75 90 110

Work Principle

NLS series inflow pressure screen is a continuously screening equipment under the fully closed position with pressure. When works, the pulp enters into the outside of screen drum along the tangent direction through the pulp pipe. Qualified pulp enter into screen drum through the sieve seam (hole) with the help of pressure difference between inside and outside of screen drum.  Then,  paper pulp come out through the pulp pipe. The pulp and impurities which can not through the sieve seam (hole) fall down to the bottom, and come out from the discharge pipe.

Rotating blade outside the screen drum can produce a moderate pressure, which improves the circulation flow of pulp, its tail will produce a negative pressure, which has an effect of backwash sieve seam (hole). It can prevent the sieve seam (hole) congestion, and pulp can enter through the sieve screening (hole) constantly and smoothly  from the surface, which ensures the continuous operation.

Capacities vary depending on feed size, feed rate, operating conditions, desired product output, characteristics of feed material, and equipment configuration

Download complete technical literature [PDF]

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