Screen blinding occurs when material blocks the screening apertures and prevents particles from passing through. Pegging is slightly different: a near-size particle becomes lodged inside an aperture. Both problems reduce the effective open area of the screen and therefore reduce real screening capacity.

A polyurethane wire screen is a screening medium that combines a metal wire or wire-rope structure with a polyurethane coating or panel construction. The wire provides mechanical reinforcement; the polyurethane forms the material-contact surface.

Working Principle

During screen operation, three mechanisms influence anti-blinding performance.

First, the polyurethane surface deforms elastically under vibration, disturbing material that would otherwise remain attached to or trapped around apertures.

Second, the wire structure provides mechanical support, maintaining screen integrity under load where a pure polyurethane panel might deflect excessively.

Third, aperture geometry determines whether near-size particles pass through or lodge. Self-relieving and tapered openings provide a wider escape path, reducing mechanical lodging.

Together these mechanisms influence how much effective open area the screen retains during operation.

Benefits

Reduced blinding. Elastic PU surface and suitable aperture geometry reduce material adhesion.

Reduced pegging. Self-relieving or tapered apertures release near-size particles.

Stable effective open area. The screen maintains usable apertures during operation rather than progressively blocking.

Wire reinforcement. Composite construction retains structural strength where pure PU panels might deflect.

Abrasion resistance. PU protects the reinforcing wire from direct material contact.

Modular maintenance. Individual panels can be replaced without renewing the full deck.

Applications

Polyurethane wire screens are applied where wet, sticky, or near-size material causes conventional WIRED & STEEL SCREEN MESH to blind or peg. Typical duty includes wet iron ore screening, coal preparation, clay-bearing aggregates, sticky mineral feeds, and applications with a high near-size particle fraction.

They are not universally better than stainless-steel wire mesh. Wire media may offer advantages in open area, fine sizing, or specific chemical environments.

Screening sits between CRUSHING and GRINDING in the comminution circuit.

Material Comparison

For a broader media comparison, see POLYURETHANE SCREEN VS RUBBER SCREEN VS WIRE MESH.

Application Comparison

Industry Application Matrix

Selection Guide

Six inputs determine the correct specification:

1. Feed material — type, moisture, clay content, abrasiveness, particle-size distribution, maximum particle size, near-size percentage, required cut size.

2. Vibrating screen conditions — feed distribution, existing media type, installation and tensioning system.

3. Aperture design — square, rectangular, slotted, tapered, or self-relieving, matched to cut size and feed.

4. Polyurethane formulation — balance of abrasion resistance, elasticity, tear resistance, impact resistance, and operating temperature.

5. Wire construction — wire or wire-rope diameter, coating thickness, panel construction.

6. Economics — screen cost per correctly screened tonne, including cleaning, labour, replacement, and downtime.

Procurement Guide

Required information: screen machine model, panel dimensions, aperture size and shape, tensioning method, wire diameter if known, material type, moisture, clay content, feed size distribution, near-size percentage, required cut size, capacity.

Drawings needed: existing screen drawing, photograph, or panel sample. If wire diameter or hook dimensions are unknown, send photos.

Material selection: request PU formulation and hardness data, wire material (steel or stainless), coating thickness.

MOQ: typically per panel or per deck set.

Lead time: commonly 2–4 weeks for standard configurations; longer for custom drawings.

Pub Time : 2026-09-30 10:22:03 >> News list