Material Drying
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PA66 color masterbatch drying
Problem Phenomenon
PA66 products with color masterbatch show silver streaks, which disappear after switching to natural material
Cause Analysis
Color masterbatch carrier and pigments absorb moisture, undried color masterbatch brings moisture into the melt, released in the cavity forming silver streaks; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience
Solution
Color masterbatch dried under the same conditions as the base material; use up color masterbatch as soon as possible after opening; moisture-affected color masterbatch dried before use; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Color masterbatch moisture is a hidden source, synchronous drying cannot be omitted; 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 subsequent similar problems
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