Waste screening for SRF / RDF 

A disc screen makes SRF compliant with the classes cement plants require and cuts the cost of the shredding line. It does two jobs: it removes the unwanted fine fractions (sand, soil, inerts) that lower the calorific value, it separates material already at size so the shredder only processes oversize. The Ecostar disc screen separates into the target sections without shredding the material, with sections adjustable from 10 to 100 mm.

The disc screen belongs both before and after the shredder, in the primary and secondary stages. Placed before, it selects material already at size and extracts heavy inerts, saving the shredder’s blades from wear and breakage. Placed after, it acts as a final quality check, separating the material into the target sections and sending only the oversize back to the shredder. This double position is the setup Ecostar recommends for SRF production.

With HDDS (Hyper Dynamic Disc Screening) technology, designed for long, stringy materials. In C&I (commercial and industrial waste and MSW (municipal solid waste), light material, rags and fluff are the main challenge of SRF production. HDDS uses a special fin that allows the stringy plastic to “surf” on the screening surface moving it to the oversize, instead of letting it wrap around the shafts. The flow keeps moving and downtime for manual cleaning drops.

Fluff and stringy plastics are stopped from wrapping around the screen by HDDS (Hyper Dynamic Disc Screening) technology, designed for long, stringy materials. In C&I (commercial and industrial waste) and MSW (municipal solid waste) alike, light material, rags and fluff are the main challenge of SRF production. HDDS uses a special fin that lets the stringy plastic “surf” on the screening surface, moving it to the oversize instead of letting it wrap around the shafts: the flow keeps moving and downtime for manual cleaning drops.

Cement plants set strict limits on section size (typically under 30-50 mm) and on the calorific value of RDF/SRF. The Ecostar disc screen delivers accurate separation without shredding the material: it isolates and removes the unwanted fine fractions, such as sand, soil and small inerts, keeping them out of the final product. The result is a homogeneous, high-calorific fuel compliant with the required classes. The cement-plant section values are industry requirements, not Ecostar specifications.

The screen-shredder pairing saves energy and blade wear by avoiding over-shredding: when the shredder only processes material that actually needs reducing, power peaks and machine running hours go down, and the blades last longer. The C&I and MSW that RDF/SRF is made from are highly abrasive materials. The discs are made of HARDOX 500 TUF with very high wear resistance, and the screening system lets you replace individual worn elements on site. This cuts maintenance costs and downtime, the two items that weigh most on the OPEX of an RDF/SRF line.

Yes. Drum and vibrating screens tend to clog or create the mattress effect with wet materiale. The up and down motion of the Ecostar discs continuously lifts and breaks up the wet material blocks and frees the fine combustible fraction, keeping screening steady even in critical storage or weather conditions.