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Polyurethane (TPU, PUR)
(of a wide range of Shore hardness) |
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Underwater pelletizing of all variants produces very good results. Polyurethane is easy to handle - no processing problems are to be expected. Gala systems permit processing TPU in both compounding, and reaction processes, in addition to the normal incorporation of fillers and pigments. In micro-pelletizing soft TPU, pellet sizes of approx. 0.5 mm are currently possible. Advantages The advantage of underwater pelletizing in this field is the good cooling of the pellets in the water flow. Since also cold water can be used, surface tack can be fully eliminated. Underwater pelletizing produces ball-shaped pellets that do not have any linear adhesion surfaces even after leaving the water flow, as are known from standard cylindrical pellets. Gala systems permit the processing of TPU of a Shore hardness of 60 A through to 75 D - without any conversion. The reaction and/or crystallization processes of the pellets can be implemented in appropriately sized piping or in Gala crystallization systems. Reasons for preferring a Gala underwater pelletizing system: • Low capital expenditure • Low space requirements • Low energy costs • Low tooling costs • Fully automatic and redundant design • Low sound pressure level < 80 db(A) |
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