Material Drying
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PET vented extrusion drying
Problem Phenomenon
Vented extruders processing PET still require pre-drying—is this superfluous?
Cause Analysis
Vented extrusion can remove part of the moisture, but PET moisture requirements are demanding, and venting alone can hardly stably reach 50 ppm; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
For vented extrusion of PET, it is still recommended to pre-dry to below 200 ppm and then let the venting perform deep dehydration; bottle-grade products must be pre-dried; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Vented extrusion is a supplement, not a replacement, and bottle grade must be pre-dried; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent similar problems
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