Material Analysis
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PPO Melt Near-Newtonian Fluid Characteristics
Fenómeno do problema
【Problem Phenomenon】Using increased shear rate to improve PPO filling is ineffective, and flow improvement is limited
Análise das causas
PPO has poor flowability and is a near-Newtonian fluid; viscosity is relatively sensitive to temperature but insensitive to shear; increasing speed and shear helps little in reducing viscosity, and raising temperature is the effective means
Solução
Improve flow mainly by adjusting temperature: raise both melt temperature and mold temperature; wall thickness design not less than 0.8mm; enlarge runners and gates to reduce resistance rather than relying on shear; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Conclusão principal
PPO as a near-Newtonian fluid responds to temperature, not shear; raising temperature is the right way to reduce viscosity; 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 subsequent similar problems
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