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RHEWUM GmbH | 42875 Remscheid | Tel. +49 (0) 2191 - 5767 - 0 | info@rhewum.de

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Polymers

In the production of synthetic granules the polymerised pellets become screened to defined lenghts. Conventional particle size of these “On-size” pellets is between 1.6 mma nd 6.0 mm. For cooling and hardening the granues become extruded in a water quench. Afterwards the water is separated from the solids and the geranules are screenid to the defined sizes. Often the screening machines are made of stainless steel and the pellets are screened on punched plates. Sometimes the screening takes part under exclusion of oxygene. In this cases the screening machines are executed gas tight and flooded with an inert gas, e.g. nitrogen. In some cases the surface of the machines is polished.

Another task in the area of polymers is the optical sorting of charges which are contaminated in terms of colour. In case of an unwanted mixing of granules with different colours they become separated by optical sorting.

Polymers are polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), polytetrafluorethylene (PTFE), polymethylmethaacrylate (PMMA), polyamide (PA), polyester , polycarbonate (PC) and polyethylenterephtalat (PET). In the polymerisation process these polymers are generated from monomers by polymerisation, polycondensation or polyaddition. Furthermore thermoplastics, duroplastics and elastomers are differentiated regarding to their physical characteristics.