Drying of PET resin and PET flakes Figure

How Make Polyester From Pet Flakes

The drying of a virgin PET resin and reground PET flakes at temperature levels of 160-180oC to below 0.005 moisture content is essential for the production of amorphous multilayer polyester bottles. Polyester is an effective desiccant. The water absorption depends on a relative humidity, residence time, temperature, and dimension of the flakes. When flakes containing moisture are heated up to the melting temperature, hydrolytic degradation occurs lowering a viscosity ofthe melt that results in...