Injection Molding
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POM short shot and short fill
Problem Phenomenon
Thin-walled or long-flow-path products are incompletely filled with material shortage at the end, filling completely after increasing temperature and speed.
Cause Analysis
POM solidifies quickly, and the front flow is interrupted after cooling in thin-walled long-flow paths; insufficient injection pressure, low melt and mold temperature, and too-thin runners all cause short shots.; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Increase injection pressure and speed; ②appropriately increase melt and mold temperature; ③enlarge runners and gates; ④optimize venting to reduce back pressure resistance.; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
POM short shots are troubleshooted from the three paths of pressure, temperature, and runners; when increasing temperature and speed, take care not to cross the decomposition temperature red line.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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