Molds & Tooling
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PA6 Uneven Surface Gloss
Problem Phenomenon
The same surface of a PA6 product shows uneven light and dark gloss with regional differences
Cause Analysis
Uneven cavity surface temperature causes inconsistent melt replication of the mold surface state; where the temperature is low the melt front condenses quickly and the gloss is poor; uneven mold surface polishing and poor venting also cause gloss differences
Solution
Measure the cavity temperature distribution and homogenize the cooling channels; unify the polishing grade of the mold surface; improve venting to avoid fogging in trapped-air zones; appropriately raise mold temperature and holding pressure to improve replication; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
For uneven gloss, first check mold temperature uniformity, then check mold surface condition and venting; 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 problems in the future
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