Simple handling and maintenance have always been the trademarks of EREMA hot die face pelletising systems.
Ongoing development of Direct Drive technology has added even more operational reliability, ease of use and flexibility.
The melt emerging from the holes in the heated pelletiser die face (1) are cut off by rotating knives (2). The pellets are flung outward by the centrifugal force into a rotating water ring (3). This cools the pellets and transports them via a flexible discharge channel to the to the pellet water removal screen (4). The pellets pass through the oversize particle separator to the drying centrifuge. They are then conveyed in a stream of air through a transport duct to the silo or bagging station. The cooling water circulates in a closed circuit and is fed back to the pelletising head through a cooling water filtering system and a heat exchanger using a water pump.
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Robust implementation proven again and again. For automatic repelletising of different thermoplastic materials, compounds and wood/plastic composites (WPC).
The series HG AIR 80K, HG AIR 120K, HG AIR 120 and HG AIR 240 set new standards in terms of operational reliability, straightforward operation and flexibility.
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EREMA's semi-submerged strand pelletising systems are used to pelletise technical thermoplastics such as PET. Straightforward operation and minimum labour requirements contribute to the very high degree of operational reliability.
Easy start-up, fast cleaning when changing over material and automatic self-feeding if strand breaks occur make these systems indispensable. Integrated crystallisation is also possible for PET.
The melt strands coming through the boreholes of the heated die head (1) are conveyed to a horizontally and vertically adjustable water chute (2). The strands are cooled by a laminar flowing film of water and manually adjustable spray nozzles. They are cooled down to such an extent that they do not lose their shape in the subsequent strand pelletiser (3). The strands retain enough core heat to effectively support the later drying process on the vibration screen and enable crystallisation if required.
If there are any torn or interrupted strands the laminar water flow refeeds them to the strand pelletiser fully automatically and without any external operator intervention.
After it passes through the cooling piping (4) the transport water and any fine particles which it may have are removed from the pellets in the pellet water removal screen (5). After filtration and cooling the water is returned to the process water circuit. The latent residual heat of the pellets continues the drying process on the pellet water removal screen. They then move on via an oversize particle screen (6) to the centrifuge (7) for the final drying process.
A system for the integrated and energy-efficient crystallisation of PET or PLA. The melt-filtrated strands are cooled briefly in water and then cut into pellets. The material is then fed immediately into a container.
The latent thermal energy inside the pellets is used for crystallisation – without additional energy input required from the outside and without interrupting the process.
HOW IT WORKS
ASP-CIC
The melt strands coming through the boreholes of the heated die head (1) are conveyed to a horizontally and vertically adjustable water chute (2). The strands are cooled by a laminar flowing film of water and manually adjustable spray nozzles. They are cooled down to such an extent that they do not lose their shape in the subsequent strand pelletiser (3). The strands retain enough core heat to effectively support the later drying process on the vibration screen and enable crystallisation if required.
After the strand pelletiser the surface moisture is removed in the centrifuge (4). The amorphous pellets are crystallised in the crystallisation unit (5) using the residual core energy. A vertical conveyor screw (6) moves the major part of the crystalline pellets into the post-crystallisation unit (7). A small portion is returned to prevent the still amorphous pellets from sticking. Thanks to the integrated weight sensor, the system is controlled completely automatically. Non-conforming pellet sizes are removed at the classification screen. A transport blower then moves the pellets to the next step.
Impressions
Pelletising
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