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Other polymers |
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| (CA, EMA, EAA, EPDM, EP, PC, PMMA, POM, PSU, PTFE, PVAC, Wax,) Underwater pelletizing of CA produces good results, requirements can also be met in micro-pelletizing as from 0.8 mm. Underwater pelletizing of EMA and EAA produces very good results, comparable to EVA, down to a minimum size of 0.5 mm. Underwater pelletizing of EPDM, EPR, EPM etc. produces good results. In some cases, long cooling lines or powdering may be required. EP, the epoxy resin can be processed in underwater pelletizing systems as from a viscosity of 3,000 mPas with good results. Very gentle drying of the pellets is required. Underwater pelletizing of ionomer produces very good results. Underwater pelletizing of PC produces very good results. Underwater pelletizing of PMMA produces good results, however, the material has a slight tendency to melt fracture. Underwater pelletizing of POM produces good results. The product tends to separate formaldehyde at extreme shear loads and high pressures. Underwater pelletizing of PSU produces good results, however, the high temperature polymer requires special die plate designs and seals. Underwater pelletizing of PTFE produces good results as long as the extrusion is appropriate. Underwater pelletizing of PVAC produces very good results and is very simple. Very gentle drying of the pellets is required. Underwater pelletizing of waxes produces good results at a viscosity of > 3,000 mPas. Underwater pelletizing of bitumen produces very good results and is very simple. Very gentle drying of the pellets is required. Advantages The advantage of underwater pelletizing in this field is the good cooling of the pellets in the water flow. Another benefit of using Gala pelletizing systems for these materials is the containment of the typical odors and gases. The ball shape of the pellets helps contributes to a more simple and more precise dosing. The noise emission level can be minimized by selecting an appropriate dryer. An additional advantage of underwater pelletizing in this field is the round or elliptic pellet shape and the resulting free-flowing properties of the product in the subsequent use. Die plates with specially designed heat conduction for an ideal heat transfer at the interface have considerably extended the window of applications for these products. Reasons for preferring a Gala underwater pelletizing system: |
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