What Is A PU Polyurethane Cleaning Ball?
Apr 22, 2026
A PU Polyurethane Cleaning Ball (also known as a screen bouncing ball or self-cleaning ball) is a spherical elastomer component placed between the screen deck and bottom panel of a vibrating screening machine. As the screen vibrates, these balls bounce continuously, striking the screen surface from underneath to dislodge trapped particles and prevent mesh blinding.
Simple Analogy
Think of it like a bouncing hammer that never stops. Each bounce creates a small impact that shakes loose material stuck in the screen openings – similar to tapping a clogged sieve from underneath to keep it flowing.
How It Works
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Vibrating screen motion → Balls bounce up and down → Impact screen mesh → Dislodge stuck particles → Keep screen openings clear
| Step | Action |
|---|---|
| 1 | Screen vibrates at high frequency |
| 2 | Bouncing balls lift off the bottom panel |
| 3 | Balls strike the screen deck |
| 4 | Impact clears trapped particles |
| 5 | Cycle repeats continuously |
Why Polyurethane (PU)?
Polyurethane is the preferred material because it offers the best balance of properties for this demanding application:
| Property | Why It Matters |
|---|---|
| High elasticity | Bounces aggressively to create cleaning impact |
| Wear resistance | Survives millions of impact cycles without wearing down |
| Tear strength | Won't crack or fragment under repeated stress |
| Oil resistance | Unaffected by lubricants or contaminants |
| Customizable | Can be made flame retardant or anti-static for mines |
Key Benefits
| Benefit | Description |
|---|---|
| Prevents screen blinding | Keeps mesh openings clear for consistent throughput |
| Increases screening efficiency | Clean screen = better separation accuracy |
| Reduces downtime | Eliminates manual cleaning stops |
| Extends screen life | No hammering or scraping that damages decks |
| Low noise | Quieter than steel or hard plastic cleaners |
Common Applications
| Industry | Material Screened |
|---|---|
| Mining | Coal, iron ore, copper, gold |
| Aggregates | Sand, gravel, crushed stone |
| Asphalt plants | Hot mix aggregate |
| Recycling | Construction waste, demolition debris |
| Chemical | Powders, granules |
| Food | Flour, sugar, grain (food grade available) |
Typical Specifications
| Parameter | Typical Value |
|---|---|
| Material | Cast polyurethane elastomer |
| Hardness | 80A – 90A Shore A |
| Rebound resilience | ≥ 60% |
| Diameter | 20mm – 50mm (custom: 15mm – 80mm) |
| Operating temp | -35°C to +85°C |
| Color | Yellow, red, black, or custom |
Available Variants
| Type | Best For |
|---|---|
| Standard | General aggregate, sand, gravel |
| Flame retardant | Underground coal mines |
| Anti-static | Explosive dust environments |
| Food grade | Grain, sugar, food processing |
| High temperature | Asphalt plants (special formulation) |
Quick FAQ
Q: How long do PU cleaning balls last?
A: Typically 3–5 times longer than rubber balls – often 6–12 months depending on application.
Q: What size ball do I need?
A: Depends on your mesh opening. Fine mesh needs smaller balls (20-25mm); coarse mesh needs larger balls (30-50mm).
Q: How many balls per screen?
A: Typically 25–60 balls per square meter, depending on mesh size and application.
Q: Are they reusable?
A: Yes. When worn, simply replace them – no special disposal requirements.
Summary
A PU Polyurethane Cleaning Ball is a simple but highly effective component that uses continuous bouncing action to keep vibrating screens clear of stuck particles. It improves screening efficiency, reduces downtime, and extends equipment life – all at a low operating cost.
