A ball deck (also called a ball tray or bouncing ball tray) is a perforated plate mounted directly beneath the screen cloth in a vibratory separator, holding rubber or silicone balls that bounce against the underside of the screen during operation to prevent blinding by dislodging near-size particles from the mesh openings. Ball decks are the most common and cost-effective de-blinding device used in round vibratory separators.
The perforated tray sits in the screen frame assembly, just below the woven wire screen. Rubber or silicone balls rest in the tray's compartments. As the vibratory motor generates motion, the balls bounce continuously against the underside of the screen cloth, creating a tapping action that knocks lodged particles free. This simple mechanical action keeps screen openings clear, maintaining throughput and screening efficiency without any electrical or pneumatic systems.
Ball Deck Specifications
| Component | Options | Application |
|---|---|---|
| Ball Material | Natural rubber, silicone, neoprene | Rubber: general industrial; Silicone: food/pharma; Neoprene: chemical resistance |
| Ball Diameter | 3/4", 1", 1-1/4", 1-1/2" | Smaller for fine mesh; larger for coarse mesh |
| Tray Material | 304 SS, 316 SS, carbon steel | Match to separator material and application |
| Tray Hole Pattern | Round holes, various diameters | Sized to retain balls while allowing airflow |
Why This Matters in Vibratory Screening
- Prevents blinding — The continuous tapping action dislodges near-size particles that lodge in screen openings, especially on screens from 40–325 mesh where blinding is most problematic.
- Maintains throughput — By keeping screen openings clear, ball decks maintain consistent throughput over the screen's service life.
- No external power — Ball decks operate purely on the vibratory motion already present in the separator, requiring no additional energy, wiring, or controls.
- Low maintenance — Replace worn balls periodically (every 3–12 months depending on use). No moving parts to service.
Related Glossary Terms
- Blinding — The problem ball decks solve
- De-Blinding — The broader category of anti-blinding methods
- Ultrasonic Deblinding — An electronic alternative for ultra-fine mesh
- Near-Size Particles — The particles that cause blinding
- Screen Frame — Holds both the screen cloth and ball deck assembly
Ball Deck FAQs
What is a ball deck on a vibratory screener?
A ball deck is a perforated tray beneath the screen mesh holding bouncing balls. The vibratory motion causes balls to tap against the screen, dislodging particles from openings and preventing blinding.
What size balls should I use?
Common sizes range from 3/4" to 1-1/2" diameter. Finer mesh screens use smaller balls; coarser screens use larger. Silicone balls are used for food/pharma; rubber for general industrial applications.
Ball Decks & De-Blinding Accessories
ScreenerKing supplies ball deck trays and replacement balls for all major vibratory separator brands. Available in FDA-compliant silicone and industrial rubber.