Injection Molding
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PP Injection Pressure Range
Fenómeno do problema
[Problem Phenomenon] Improper PP injection pressure, short shots and flash alternate
Análise das causas
PP injection pressure 70-140MPa: take the upper limit for thin-wall complex parts, the lower limit for thick-wall simple parts; PP has good fluidity, and excessive pressure easily causes flash; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based on experience alone
Solução
Upper limit for thin walls, lower limit for thick walls; reduce pressure after filling is satisfied; check pressure first for flash; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability; change only one variable at a time and record parameter changes to facilitate locating effective measures
Conclusão principal
PP injection 70-140MPa; good fluidity means guarding against over-pressure flash; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar future problems
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