How to Prevent Screen Blinding and Pegging: 7 Proven Solutions

Understanding the Problem

What is Blinding?

• Fines packing apertures due to moisture.
• Common with clay, damp sand, and wet bulk materials.
• Reduces open area by 30-70%, drastically cutting capacity.

What is Pegging?

• Near-size particles wedging in the mesh opening.
• Common with cubical aggregates exactly matching the aperture size.
• Causes permanent blockage until physically removed.

Root Cause Analysis

7 Practical Fixes (Ranked by Effectiveness)

Fix #1: Optimize Ellipse Angle (ETE Only)

• Sticky material: Adjust to 40-45° for aggressive clearing.
• Dry precision: Tighten to 25-30°.
• Adjustment time: ~15 minutes.

Fix #2: Install Anti-Blinding Balls

• Requires a sub-deck tray beneath the primary mesh.
• Ball size: 25-40mm bouncing randomly to clear apertures from the bottom up.

Fix #3: Upgrade to Polyurethane Panels

• Continuous flexing action prevents particle lock-in.
• Wear life: Up to 3x longer than traditional woven wire mesh.
• Blinding resistance: 60% better than wire.

Fix #4: Add Ultrasonic Deck (Fine Screening)

• Frequency: 25-50 kHz transmission directly into the mesh.
• Best for precision sieving <3mm apertures.

Fix #5: Optimize Spray Bar Setup

• Pressure: 2-4 bar directed at a 45° angle to the deck.
• Ensure complete width coverage.

Fix #6: Reduce Bed Depth

• Rule of thumb: Bed depth must be ≤3× aperture size.
• If depth is too high, near-size material is forced into the mesh by the weight above.

Fix #7: Increase Vibration Intensity

• Increase G-force into the 4-6G range depending on structure limits.
• Caution: Do not exceed bearing specifications. Always verify with GELEN engineering.

Troubleshooting Flowchart

Contact Our Engineers About Your Specific Problem

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