Material Drying
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PMMA Color Masterbatch Drying
Problem Phenomenon
Bubbles appear in PMMA products with color masterbatch added
Cause Analysis
The color masterbatch carrier absorbs moisture without being dried, and the introduced moisture vaporizes in the melt; During on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based on experience alone.; this mechanism has been repeatedly verified by industry data and should be confirmed first during troubleshooting
Solution
Dry color masterbatch under the same conditions as the base material; select PMMA-dedicated color masterbatch; oven-dry dampened 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
Synchronized drying of color masterbatch is an anti-bubble detail; After confirming effectiveness, fix 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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