Material Drying
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PET silver streak identification
Problem Phenomenon
Silver streaks appear on PET preforms and are still not eliminated after enhanced drying
Cause Analysis
Besides moisture, PET silver streaks may also be caused by shear heat degradation or mixed foreign material; different causes require opposite countermeasures; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Observe the air-shot strand: bubble-like indicates moisture, silky transparent indicates shear; check mixing and screw wear; for moisture silver streaks, strengthen drying again; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Identify silver streaks before treating them to avoid ineffective drying; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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