Injection Molding
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POM nozzle blockage
Problem Phenomenon
Pressure spikes during injection and filling is insufficient; disassembly and inspection finds the nozzle orifice partially blocked by solidified material and carbide.
Cause Analysis
Too low nozzle temperature causes the melt to solidify at the outlet, or carbonization and accumulation of retained material gradually narrows the flow cross-section; cooling of residual material after shutdown is a common trigger.; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Increase and stabilize the nozzle temperature; ②clean the accumulated material in the nozzle; ③empty the nozzle before shutdown; ④check the nozzle heater band and thermocouple.; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Nozzle blockage causes filling fluctuation and pressure abnormality; temperature stability and shutdown operation standards are the prevention priorities.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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