Molds & Tooling
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POM product warpage deformation
Problem Phenomenon
Flat plate or shell products warp and deform after demolding, the warpage amounts in different directions are inconsistent, and the deformation pattern changes after adjusting the mold temperature.
Cause Analysis
Uneven mold temperature combined with POM's high crystallization shrinkage causes inconsistent shrinkage in various parts of the product; improper gate position and holding pressure cause orientation stress, aggravating warpage.
Solution
①Balance mold temperature and check water lines; ②adjust gate position and holding pressure; ③extend cooling time for sufficient shaping; ④optimize wall thickness uniformity.; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
POM warpage is jointly driven by uneven crystallization shrinkage and stress; mold temperature balancing is the primary adjustment means, and combined with holding pressure and gate optimization, stable dimensions can be obtained.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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