Material Drying
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PVDF Appearance Part Flow Mark and Gloss Unevenness
Problem Phenomenon
【Problem Phenomenon】PVDF high appearance requirement parts have surface flow marks and gloss differences, failing pretreatment for electroplating and coating
Cause Analysis
Melt temperature fluctuation, unstable injection pressure and uneven mold temperature cause surface micro-replication differences; when silver streaks and flow marks coexist, it mostly points to drying and temperature stability; during on-site troubleshooting, verify item by item according to this mechanism, avoiding blind machine adjustment based solely on experience
Solution
First check the two items of drying and melt temperature stability; homogenize and appropriately raise mold temperature to improve surface replication; smooth the injection pressure curve; if necessary, use mold surface texture to cover slight flow marks
Key Takeaway
For appearance parts, stabilize drying and temperature first; gloss differences are mostly stability problems; 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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