Material Drying
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PET color masterbatch drying
Problem Phenomenon
PET preforms with added color masterbatch show white haze, while natural-color preforms are normal
Cause Analysis
The color masterbatch carrier absorbs moisture and is not dried, and the introduced moisture forms white haze in the preform body; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience; this mechanism has been repeatedly verified by industry materials and should be confirmed first during troubleshooting
Solution
Dry the color masterbatch under the same conditions as the base material; select dried color masterbatch; store sealed after opening; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability; change only one variable at a time and record the parameter changes, so as to locate effective measures
Key Takeaway
Color masterbatch moisture is a hidden source of white haze; 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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