Granulate formation with a residual moisture of less than 1wt, comprises underwater or water ring granulation of a polymer melt and filler mixture

摘要

A process for producing a granulate with a residual moisture of less than 1wt%, comprises underwater or water ring granulation of a mixture of a polymer melt and a filler. The thermoplastic polymer melting point is 140-340oC. Process water from the underwater granulate (1) or the water ring granulator is applied to a sieve (2), and the granulate temperature is at least 120oC. The water vaporises until the required residual moisture level is reached. The predetermined residual moisture is less than 0.5wt%. The thermoplastic polymer is chosen from polyalkyleneterephthalate, polyamide, polysulphone or polyoxymethylene.