Molds & Tooling
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POM product uneven surface gloss
Problem Phenomenon
Gloss differences between different areas of the same product are obvious, highly corresponding to the mold temperature distribution map.
Cause Analysis
Uneven mold surface temperature causes different replication effects in various areas of the product; POM is sensitive to mold temperature, and temperature differences directly manifest as gloss differences and shrinkage differences.; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Balance the mold cooling water lines; ②detect the cavity surface temperature distribution; ③unify mold temperature settings; ④repair water line blockages or design defects.; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Uneven gloss is a surface projection of the mold temperature distribution; water line balancing modification can solve it at once, and daily monitoring of water temperature and flow stability is needed.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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