Molds & Tooling
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POM zipper fasteners
Problem Phenomenon
Zippers and fasteners crack in batches, and the fracture rate rises significantly in low-temperature environments
Cause Analysis
POM's low-temperature toughness decreases, and thin-walled fasteners break brittlely during low-temperature assembly or use; stress concentration design and demolding damage become crack initiation points; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Round and thicken the fastener root; ②select toughened grades for low-temperature conditions; ③optimize demolding to prevent ejection damage and scratches; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
POM fasteners have small size but big risk; structural rounding, grade toughening, and demolding protection are the triple defense lines; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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