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 Polypropylene (PP) |
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Underwater pelletizing of PP produces very good results for all standard pellet sizes, including PP copolymers, PP homopolymers, PP block copolymers, and PP random copolymers. PP is easy to pelletize with nearly all commercial fillers. CaCO3, talc, chalk, TiO2, carbon black, wollastonite, EPDM, EPR are used as fillers, but also pigments and other additives or stabilizers are possible. Products are tacky in processing (high MFI > 100). In micro-pelletizing PP, pellet sizes of approx. 0.6 mm are currently possible. Advantages The advantages of underwater pelletizing include the avoidance of chain formation and a significant improvement in the shape which also minimizes the residual humidity of the pellets. The direct introduction of the melt into the water flow prevents this polymer from sticking and/or forming agglomerates. 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) • Today, polymers with MFI values > 1,000 can be processed. |
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