Molds & Tooling
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POM mold parting line material leakage
Problem Phenomenon
Flash appears at the parting line and worsens shot by shot; measurement confirms a gap exists at the parting line.
Cause Analysis
Parting line wear or platen deformation makes the fit loose; when clamping force is insufficient relative to the projected area, high-pressure melt also pries open the parting line and leaks material.; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Grind and repair the parting line fit; ②check clamping force and projected area; ③reduce the injection pressure peak; ④check platen parallelism.; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Parting line material leakage needs to distinguish between wear and insufficient clamping; the former requires mold repair and the latter machine adjustment, and misjudgment causes flash to recur.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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