A powerful, energy and time-saving innovation from EREMA: COREMA? combines the benefits of recycling and compounding in a single plant. This system produces tailor-made tunable recycling compounds for especially high quality applications.
Recycling raw materials such as PP fleece, PE edge trim, PA fibres are transformed into a filtered melt using proven, robust EREMA technology which is then fed directly to the Coperion co-rotating twin screw extruder.
With its excellent mixing and gas removal properties, this part of the system can handle all compounding tasks. Besides the dosing of a wide variety of additives, high amounts of fillers and reinforcing agents can be admixed.
Feeding (1) is automatic according to customer requirements. In the patented Preconditioning Unit (2) the material is cut, mixed, heated, dried, pre-compacted and buffered. Next, the tangentially connected extruder is filled continuously with hot, pre-compacted material.
In the extruder screw (3) the material is plasticised, homogenised and then cleaned in the fully automatic self-cleaning filter (4).
The prepared and cleaned melt then goes via the melt pump (5) directly to the co-rotating, self-cleaning twin-screw extruder (6) from Coperion. With its excellent mixing and gas removal properties, this flexible part of the system can handle all compounding tasks.
Besides the dosing of a wide variety of additives, high amounts of fillers and reinforcing agents can be admixed (7). In the degassing zone (8) the compounded melt is degassed and then fed into the respective system (9) (e.g. EREMA hot die face pelletising system).
Counter Current technology developed by EREMA changes the direction of rotation inside the preconditioning unit: the plastic material thus moves in the opposite direction to that of the extruder screw. A small change with a big impact: the relative speed of the material in the intake zone, i.e. when passing from the cutter/compactor to the extruder, accelerates so that the extruder acts in the same way as a sharp cutting edge which literally "slices up" the plastic.
As a result the extruder handles more material in a shorter time. Thanks to the enhanced material intake plastic can be processed even at lower temperatures at a high throughput - meaning higher productivity, flexibility and operational reliability.