Pressure Screen Baskets: Technical Specifications and Replacement Supply

Pressure screen baskets are critical consumable components in stock preparation and approach flow systems. Slot geometry, open area, and material grade all have a direct effect on fiber separation efficiency, contaminant rejection, and pressure drop across the screen. Selecting and maintaining the correct basket specification keeps screening performance stable, minimizes fiber loss, and protects downstream equipment.

PMTEC supplies replacement baskets manufactured to match the dimensional standards and operational characteristics of pressure screens in service across a wide range of mill configurations.

1. Slot Specifications by Screening Stage

Slot width, profile, and open area are the primary parameters governing screening performance. The values below represent typical industrial ranges for recycled fiber and stock preparation applications.

Screening Stage

Slot Width (mm)

Slot Profile

Open Area (%)

Typical Pulp Type

OCC Fine Screening	0.20 – 0.30	Straight	12 – 18	Recycled OCC
Deinking Screening	0.15 – 0.20	Wedge	14 – 20	Recycled Paper Pulp
Secondary Screening	0.18 – 0.25	Straight	13 – 18	Mixed Recycled Fiber
Approach Flow Screening	0.10 – 0.15	Fine Slot	10 – 15	Virgin Pulp & Blends

Note: Slot geometry and open area together determine system throughput, hydraulic pressure drop, and contaminant rejection efficiency. Final selection should be based on feed consistency, accepts quality targets, and rotor tip speed.

2. Basket Dimensional and Manufacturing Parameters

Replacement baskets must be dimensionally compatible with the installed screen housing and rotor clearance. The table below covers the engineering parameters that most directly affect fit, performance, and service life.

Parameter

Typical Range

Notes

Basket Diameter	300 – 1,200 mm	Determined by installed screen model and capacity
Basket Height	400 – 1,800 mm	Affects screening area and volumetric throughput
Slot Tolerance	±0.01 – ±0.02 mm	Critical for fiber loss control and screening accuracy
Open Area Ratio	10 – 25 %	Governs hydraulic resistance and flow capacity
Surface Finish	Ra ≤ 1.6 µm	Reduces slot plugging; improves fiber passage

Note: Dimensional accuracy and surface finish are critical for rotor clearance stability and for reducing maintenance frequency. Tight slot tolerances prevent excessive fiber loss while maintaining adequate throughput.

3. Material Selection and Wear Performance

Material grade determines basket durability under abrasive pulp conditions and influences corrosion resistance in chemically aggressive environments. The appropriate grade depends on pulp type, pH, and the presence of abrasive contaminants.

Material Grade

Hardness

Wear Resistance

Typical Application

SS 304	150 – 190 HB	Standard	General stock screening; low-corrosion environments
SS 316	150 – 200 HB	Moderate (corrosion)	Chemical pulp lines; deinking systems
Duplex 2205	230 – 280 HB	High (wear & corrosion)	Recycled fiber; high-abrasion or aggressive conditions

Note: Electropolishing is commonly applied as a secondary treatment to improve slot surface smoothness, reduce fiber hang-up at slot edges, and lower the risk of plugging during operation.

4. Compatibility and Replacement Supply

Pressure screen baskets must maintain precise dimensional compatibility with the installed screen housing, rotor geometry, and flange arrangement. Mills frequently operate screening equipment installed across multiple project phases, which can introduce variation in basket dimensions and slot specifications within the same facility.

Each basket is engineered to replicate the structural, hydraulic, and operational characteristics of the installed screen. Material grade, slot geometry, and surface finish are confirmed against pulp type and process conditions before manufacture to ensure consistent performance and extended service life.