Material Drying
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HDPE color masterbatch drying
Problem Phenomenon
Bubbles appear in HDPE products with added color masterbatch
Cause Analysis
The color masterbatch carrier absorbs moisture and brings in water; when troubleshooting on site, 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 data and should be confirmed first during troubleshooting
Solution
Dry the color masterbatch and base material under the same conditions; select PE-specific color masterbatch; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability; change only one variable at a time and record parameter changes, to facilitate locating effective measures
Key Takeaway
Synchronous drying of the color masterbatch prevents bubbles; 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 similar future problems
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