METHOD FOR THE PRODUCTION OF POLYESTER GRANULES LOW IN HYDROLYSIS MADE OF HIGH-VISCOSITY POLYESTER MELTS, AND DEVICE FOR THE PRODUCTION OF THE POLYESTER GRANULES, AND POLYESTER GRANULES LOW IN HYDROLYSIS

摘要

The invention relates to a method and device for the direct production of polyester granulate from a highly viscous polyester melt with a polymerization degree of 132 to 165, as well as the granulates formed therefrom. In the method, the highly viscous polyester melt is subjected to a pre-drying and drying/degassing after a hot cutting method. Hot cutting is implemented at water temperatures of 70° C. to 95° C. and with a liquid to solid ratio of 8 to 12:1.