PROCESSING POLYETHYLENE TEREPHTHALATE ON A SINGLE SCREW EXTRUDER WITHOUT PREDRYING USING HOPPER- AND MELT DEGASSING

摘要

Conventional PET processing requires pre-drying, an energy- and cost-consuming process limiting production flexibility. The paper presents combined hopper- and melt degassing in a single screw extruder as a real alternative to predrying and investigates the influence of extrusion- and degassing parameters, screw-design and water content on both intrinsic- and melt viscosity.