Plugging is a form of screen blinding in which near-size particles become lodged within screen openings, stuck partway through the aperture and blocking material flow from both sides. Unlike pegging where particles wedge from above, plugged particles are trapped within the mesh thickness itself. Plugging is the most common blinding mechanism on vibratory screeners processing materials with a high percentage of near-size particles.
A plugged particle has entered the aperture but cannot complete its passage to the underside. It sits inside the wire intersection, blocking the opening completely. As more particles plug, the screen's effective open area decreases steadily. In severe cases, plugging can reduce a 40% open area woven wire cloth to under 15% effective open area within hours, requiring the separator to be stopped and the screen cleaned or replaced. On ScreenerKing, Sweco, Kason, and Midwestern separators, plugging is managed through ball deck systems, ultrasonic deblinding, or mesh size adjustment.
Plugging Severity and Impact on Screening
| Open Area Loss | Severity | Throughput Impact | Recommended Action |
|---|---|---|---|
| 0-10% | Normal operation | Minimal reduction | Monitor; standard ball deck is sufficient |
| 10-25% | Moderate plugging | Noticeable throughput drop | Increase amplitude; verify ball deck function |
| 25-50% | Severe plugging | Major throughput loss, poor separation | Stop and clean screen; consider mesh change |
| 50%+ | Critical blinding | Screener effectively non-functional | Replace screen; redesign mesh/media selection |
Why This Matters in Vibratory Screening
- Efficiency loss — Plugging is the primary reason vibratory screeners fail to meet rated capacity. Every plugged opening is permanently blocked until physically cleared.
- Product contamination risk — As plugging forces more material to the oversize discharge, undersize fines remain in the oversize fraction, contaminating downstream product.
- Increased downtime — Severe plugging requires stopping production to clean or replace screen cloth, directly impacting plant availability.
- Mesh selection — Understanding plugging behavior helps operators choose the correct mesh size and open area percentage for materials with high near-size content.
Related Glossary Terms
- Pegging — Elongated particles wedging into openings from above
- Near-Size Particles — Particles that cause plugging by matching aperture dimensions
- Ball Deck / Ball Tray — Primary anti-plugging system for vibratory separators
- Ultrasonic Deblinding — Keeps fine mesh screens clear of plugged particles
- Screening Efficiency — Directly reduced by plugging
Plugging FAQs
What is plugging on a vibratory screen?
Plugging occurs when near-size particles become trapped within the mesh opening, stuck partway through without passing to the underside. The lodged particle blocks the aperture from both sides, preventing any other material from passing through that opening.
How do you fix plugging on a screen mesh?
Fix plugging by installing a ball deck beneath the screen, increasing vibration amplitude, or switching to an ultrasonic deblinding system for fine mesh applications. If plugging is persistent, consider increasing mesh size by one increment to move the problem particles out of the near-size range.
Stop Screen Plugging
ScreenerKing offers ball decks, ultrasonic kits, and high-open-area replacement screens designed to minimize plugging on all separator sizes from 18" to 60".