Every sorting plant starts at the same point: someone tips waste into the hopper, and from there the material has to enter the line at a steady rate. An apron feeder, also known as a chain plate feeder, does exactly that. It takes mixed municipal waste from the reception hopper and delivers it onward at a uniform rate, instead of sending surges that choke the machines downstream.
What sets it apart from an ordinary belt conveyor is the construction. The carrying element here is not rubber but overlapping steel slats, pulled by a sleeve roller chain. That lets it absorb the impact of a front loader bucket directly and run on abrasive, wet or bulky material without being cut. See the full range of waste sorting equipment and where each machine fits in the flow.
Key Advantages of a Waste Apron Feeder
• Steady flow, not surges, a properly set apron feeder keeps the line load uniform, so the trommel screen and the separators run at stable efficiency instead of choking and then running empty.
• Impact resistance, overlapping steel slats take direct tipping from a front loader or grab, including large heavy objects that would tear a rubber belt.
• Tolerant of real waste, it runs on wet, dirty, abrasive and mixed material, which is exactly what arrives at a municipal plant, not just on clean pre-sorted flow.
• Feed rate adjustable from the drive, the speed is set electronically, so you can change the line load while running, with no stops and no mechanical work.
• Low maintenance, the simple chain and sprocket construction has few wear points, and slats can be replaced individually.
• Good flow containment, the slat overlap limits fine material spilling underneath the conveyor, so there is less cleaning to do below the line.
Technical Specifications, Apron Feeder
| Parameter | 1 m width | 2 m width | 3 m width |
|---|---|---|---|
| Slat width (mm) | 1000 | 2000 | 3000 |
| Indicative throughput (t/h) | 10–20 | 20–40 | 40–60 |
| Installed power (kW) | 5.5–11 | 7.5–15 | 15–18 |
| Slat thickness (mm) | 6 | 8 | 8 |
| Drive | Sleeve roller chain | Sleeve roller chain | Sleeve roller chain |
| Feed rate control | Variable frequency drive | Variable frequency drive | Variable frequency drive |
These figures are indicative and cover the usual configurations. Length, incline angle, discharge height and final power are set to suit your site and the throughput the rest of the line requires.
Applications for the Chain Plate Feeder
• Municipal waste sorting plants, feeding the line from the reception hopper, the first stage ahead of the bag opener.
• Shredding installations, uniform feeding of primary shredders, where an uneven rate causes overload and stoppages.
• Landfills and transfer stations, handling old, heavy and wet waste that destroys ordinary belts.
• Construction waste lines, conveying rubble, brick and broken concrete, all highly abrasive materials.
• Bulky waste, feeding lines that process furniture, mattresses and large objects, where the slats carry concentrated loads.
How It Works
A sleeve roller chain drives sprockets, and the chain's cyclic motion pulls the steel slats that form the conveying surface. The material rests directly on the slats, not on a tensioned belt, so weight and shock transfer into the chain and the structure rather than into an elastic element. Because the slats overlap, fine material does not fall between them. Speed is controlled from a variable frequency drive, which turns the conveyor into a feed rate control instrument for the whole line, not merely a means of transport.
Selection Guide
Width is chosen from the throughput the rest of the line requires and from the maximum object size in the flow. For a municipal plant up to roughly 100 tonnes per day, a 1 metre feeder usually covers the need. Between 100 and 300 tonnes per day the 2 metre version is used. Above that, or when bulky waste appears in the flow, the 3 metre width becomes necessary, both for throughput and to avoid blockages at the inlet. One detail that is often overlooked: the feeder should be sized with throughput headroom above what the line asks for, otherwise it becomes the bottleneck of the installation itself.
Frequently Asked Questions
What apron feeder width do I need?
It depends on line throughput and on the size of the objects in the waste. As a guide, 1 metre for 10 to 20 tonnes per hour, 2 metres for 20 to 40 tonnes per hour and 3 metres for 40 to 60 tonnes per hour. If bulky waste appears in the flow, choose the next width up even if throughput alone would not require it.
How does it differ from a rubber belt conveyor?
A rubber belt is cheaper and suits already shredded, relatively clean material. An apron feeder is built for raw, wet and abrasive material and for direct loader tipping. At the plant inlet, where waste drops from height in buckets of several tonnes, a rubber belt gets cut and steel slats do not.
Can the feed rate be adjusted while running?
Yes. Speed is controlled by a variable frequency drive, so the operator can raise or lower the line load from the panel, with no stops and no mechanical adjustment. It is the simplest way to balance a plant when the waste composition changes.
How much fine material is lost underneath the conveyor?
The slats overlap precisely to limit this. A small amount of dust and very fine material remains, which is handled by a collection casing under the conveyor. Compared with an open scraper conveyor, the loss is significantly lower.
Is the equipment supplied new?
Yes. We supply new units only, made to order for your application, with complete technical documentation. We do not sell refurbished or second-hand equipment.
What maintenance does it need?
Periodic checks of chain tension, lubrication of the joints and inspection of the slats for wear or deformation. Slats can be replaced individually without dismantling the whole conveyor, so a local repair does not take your line out for long.
Why URSTAG?
URSTAG is a premium brand of recycling equipment, with over 15 years of experience. You don't just get a machine, you get a solution engineered by specialists, built from top-tier components and backed by a team that supports you from design through commissioning.
• European engineering, every machine and every complete line is designed by our engineering teams in Europe, with a focus on reliability, safety and energy efficiency.
• Premium components, we build on motors and automation from industry leaders: Siemens, Schneider Electric, ABB, WEG, SEW-Eurodrive, NORD Drivesystems and Bonfiglioli.
• Over 15 years of experience, we know how materials and machines behave in real-world operation, and we configure each solution for your flow and volume.
• New equipment, configured for you, we supply new units, made to order for your application, with complete technical documentation.
• Delivery, installation and training included, we handle transport, commissioning and operator training, with support throughout the equipment's life.
As a premium brand, URSTAG relies on European engineering, top-tier components and experience. You choose a partner that supports your production long term, with equipment built to run reliably in demanding industrial environments.
