Controlling micro-zone hydrolytic degradation in PET extrusion requires suppressing boundary-layer moisture below 30 ppm and limiting local shear heating spikes.
Extruding polyesters above 280°C demands moisture below 30 ppm to prevent ester hydrolysis, intrinsic viscosity loss, and catastrophic part brittleness.
Optimize rPET desiccant drying at 160-170°C with -45°C dew point dry air to maintain moisture under 30 ppm and prevent intrinsic viscosity drop.
Coulometric Karl Fischer testing with oven desorption at 170 °C isolates true water content in rPET below 50 ppm, preventing costly IV degradation during melt processing.
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