Screens · Integrated
Dual-Deck Flip-Flow Screen
A hard top deck over a flip-flow bottom deck — three sized fractions from one machine, with mats that flex sticky fines through instead of blinding.
On a Sherbrooke OEM sorting line, the dual-deck flip-flow screen is a specialist-built combination screen — a rigid top deck takes the overs cut while a flip-flow bottom deck of resilient polyurethane mats snaps the fines through, giving three outbound fractions (fines, mids, overs) from a single machine. The flip-flow action accelerates material at up to 50 g, so damp, sticky C&D fines that blind a conventional wire deck keep moving. Mats mount with a boltless wedge system; isolation is elastomeric with horizontal balancer stroke and minimal transmitted dynamic load. Sherbrooke OEM engineers the position, fabricates the support structure and chutes, and integrates the unit into plant controls — engineered and integrated from Sherbrooke, Quebec.
Where It Fits
- Secondary screening on C&D lines — producing the fines, mids, and overs cuts in one machine instead of two
- Damp, sticky, or clay-bound streams where conventional decks blind
- Fines lines where a clean bottom cut decides aggregate quality
Configuration & Options
Every unit is engineered per project — these are the configuration choices and options we quote against, not limits.
| Decks | Rigid top deck + flip-flow bottom deck — three outbound fractions |
|---|---|
| Cut points | Top and bottom cuts engineered per project; tapered top apertures, fine bottom apertures |
| Inside frame width | Commonly around 72 in |
| Overall length | Per project; engineering default around 26 ft |
| Declination | Around 18° downward |
| Material acceleration | Up to 50 g on the flip-flow deck |
| Mats | Resilient polyurethane, boltless wedge fastening — replaceable individually |
| Structure | Support height per line elevation |
Construction
| Screen unit | Rigid-deck / flip-flow combination screen (VSS class), RSB type |
|---|---|
| Main frame | Mild steel with integrated transverse supports for rigidity |
| Drive | Premium-efficiency TEFC motor; shaft drive with adjustable flywheels |
| Stroke | Horizontal balancer stroke with vertical main-frame stroke — tuned at commissioning |
| Isolation | Elastomeric isolation springs |
| Machine weight | On the order of 21,000 lb before structural supports |
| Supports & chutes | Engineered structural steel, chutes, and wear plate by Sherbrooke OEM |
Dual-Deck Flip-Flow Screen — Frequently Asked Questions
What does "three outbound fractions" mean in practice?
The rigid top deck takes the overs cut and the flip-flow bottom deck takes the fines cut, leaving the mids as the third stream — so one machine does the secondary screening and the fines line split at the same time. The actual cut sizes are engineered per project; no two systems use the same fractions.
Why does flip-flow not blind like a conventional screen?
The polyurethane mats alternately stretch and snap as the frame oscillates, accelerating material at up to 50 g. Damp fines, clay, and flat particles that plug fixed wire or perforated decks are thrown clear of the openings on every cycle.
Why does the bottom cut matter so much on C&D?
Because the mids fraction feeds aggregate recovery — and removing the aggregate from that fraction cleanly can make or break the recovery rate of the whole project. A sharp, non-blinding bottom cut is what hands the de-stoner a stream it can actually separate.
Need dimensions, capacity, or a budget price?
Send your material profile and layout — engineering answers with real numbers, from the team that will fabricate it in Sherbrooke.
Talk to Engineering