Direct Crystallization
Buhler AG and Automatik Plastics Machinery GmbH, the market leaders in the supply of plants for solid-state polycondensation and in the field of manufacturing PET pellets, have jointly developed the Combi-Crystal-PET® (CC-PET®) process. It optimizes direct crystallization for maximum energy savings and process stability.A typical application of the CC-PET® process is the production of PET with a low to average co-monomer degree and an intrinsic viscosity between 0.55 and 0.9 dl/g. With lower viscosities and higher co-monomer degrees, an intermediate conditioning stage is provided in the cooling fluid. An additional benefit of the CC-PET® process is that pellets with a higher surface roughness can be manufactured, which further reduces the stickiness of the pellets. The surface roughness is achieved without the dust generation otherwise typical of crystallization processes applying mechanical agitation. Quite the contrary is true: The CC-PET® process incorporates an integrated dedusting stage.
