Distinguishing Between Mesh Blinding and Particle Pegging: Causes and Solutions

Do you frequently encounter issues with screen blinding and particle wedging during material screening? In fact, there is a significant difference between the two. What are the causes of these problems, and how can they be resolved?

Mesh Blinding: When the Screen Gets “Sweaty”

Here’s the thing: if your screen’s losing capacity and fine particles are just sitting on top like wet sand, you’re dealing with mesh blinding. This happens when sticky materials—think clay, wet sand, or recycled asphalt—cling to the mesh openings instead of passing through. It’s not a blockage; it’s adhesion. The fix? Start with water sprays，just a light, targeted mist can wash away the gunk without drowning the feed. Or switch to a polyurethane screen with a self-cleaning surface. And never underestimate the power of a good rubber ball cleaner mounted above the screen. It bounces, knocks loose, and keeps things moving.

Particle Pegging: The One Rock That Stops Everything

‌If you’re seeing individual particles—usually flat, elongated, or irregular—sticking vertically in the holes like a nail in a board, that’s particle pegging. It’s not about stickiness; it’s about geometry. Think of a long, thin piece of crushed stone jamming sideways in a round hole. This is common with recycled concrete or slag. The solution? Use a larger mesh opening than you think you need, or go for a square-hole screen instead of round. Also, tweak your feed angle，particles will slam in at the wrong angle if the angle is too steep. A gentler slope gives them time to lay flat and fall through.

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Keep a simple log: note the material you’re screening, the damp weather , and which issue showed up. After three weeks, you’ll see patterns: “Every rainy Monday, blinding spikes.”Or“Pegging always happens with recycled brick.” That’s not luck but insight. Most operators replace screens blindly. The smart ones tweak the process. And that’s how you stop wasting time and money.