Paper and cardboard screening

Contaminants are separated from recovered paper by screening the flow by size: the disc screen splits it into a coarse fraction (oversize) and a fine one (undersize), moving small fragments such as staples, small stones, glass and small plastic pieces into the undersize. Reducing these unwanted materials is what brings recovered paper towards the quality grades required by the mills, codified in Europe by the EN 643 standard.

The DDS Ecostar disc screen handles this stage with hexagonal or octagonal discs that give the material an up-and-down motion: the paper slides and bounces along the deck, the fine undersize falls between the discs while the oversize advances towards the outlet. This motion keeps long fibres and sticky fragments moving forward without blocking separation, delivering fractions calibrated by size and ready for the fine sorting that follows.

No, the DDS Ecostar disc screen has an anti-wrapping and anti-clogging system that handles the long, stringy materials found in paper, such as plastic film, strapping and sheets that tend to wrap. The up-and-down motion of the discs keeps the material moving forward and stops it building up around the shafts.

The discs are made of Hardox, a wear-resistant steel, which cuts downtime and cleaning work: fewer stops, more effective working hours.

No, the DDS Ecostar disc screen has an anti-wrapping and anti-clogging system that handles the long, stringy materials found in paper, such as plastic film, strapping and sheets that tend to wrap. The up and down motion of the discs keeps the material moving forward and stops it building up around the shafts.

The discs are made of Hardox, a wear-resistant steel, and this cuts downtime and cleaning work. Fewer stops, more effective working hours.

An Ecostar disc screen processes industrial paper and cardboard up to 20 t/h thanks to the modular structure of the fixed Hexact screen, which starts at 2 metres and extends with 2 or 3 metre modular sections, matching capacity to the required throughput and the space available. The mobile Hextra screen brings the same capacity where it is needed, including outdoors.

On a paper sorting plant this throughput is reached in a contained footprint: screening 20 t/h in a small surface frees up floor space for the other stages of the line. The modular deck sizes the screen to the plant’s real throughput.

The operating costs of a DDS Ecostar disc screen are low on two items: energy and maintenance. Dynamic Disc Screening works with low traction force and needs a low installed power, with energy savings of up to 70% compared with traditional screens.

Maintenance is driven down by the Hardox discs, which resist wear and reduce spare parts and stops. On a plant that runs many hours a day, energy and spares are the two items that weigh most at year end, and DDS acts on both.

Yes, the screening size on the DDS Ecostar disc screen is adjusted in real time by varying the shaft speed through the inverter, without stopping the machine and without replacing parts. The adjustment covers a range of up to ±30% around the nominal size, within the available screening sizes of 10 to 350 mm.

For a plant taking in paper and cardboard with varying characteristics through the day, this means adapting separation to the incoming material while the line runs: the size stays stable during operation and changes only by acting on the speed, when needed.