Buhler AG and Rieter Automatik GmbH have developed a process for direct crystallization of PET.
Buhler said the trademarked CC-PET process gives significant energy savings by linking melt-phase polymermization with solid-stating. The energy contained in the polyester melt during extrusion can be utilized for the crystallization stage, eliminating the need for intermediate storage.
During strand extrusion, the strands are partially water-cooled before being pelletized. The pellets then move to a crystallizer, where they are agitated by a fluidizing gas stream to prevent agglomeration.
Buhler and Grossostheim, Germany-based Reiter Automatik build factories to make PET pellets.
Buhler is based in Uzwil, Switzerland.
Tel. 41-71-955-1111, fax 41-71-955-3851.