Patent ID: 6754979
Filing Date: 2004-06-29
Classification: B29B,B29K,F26B

Abstract:
A continuous process for drying and postcondensing polycondensate pellets in the solid phase, bya. in one or more devices, drying the polycondensate pellets and heating the same at between a minimum temperature of 105-120Â° C. and a maximum temperature 2Â° C. below their softening point, b. then treating the same in a holding device, and c. then cooling the same in a cooling device, which comprises selecting at least as the device(s) in stage a an apparatus (1) having a cuboid base unit (2) with a feed (3) for the polycondensate pellets in its upper part and an outlet (4) in its lower part, with a feed (5) on one lateral surface and with an exhaust (6) on the opposite lateral surface of the cuboid base unit (2) for the stream of inert gas, and also with distribution and retention equipment (7, 8) in the region of the feed (5) and, respectively, of the exhaust (6) for the stream of inert gas, where each of these pieces of equipment extends essentially over the entire vertical cross section of the cuboid base unit (2) and using as holding device in stage b a tower dryer with inactive tower.