Injection Molding
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POM Pressure Sensitivity for Flow Adjustment
Problem Phenomenon
Raising barrel temperature to improve flowability is ineffective and instead causes degradation; the part is still underfilled
Cause Analysis
POM melt viscosity is insensitive to temperature and approximates a Newtonian fluid, so raising temperature has poor viscosity-reducing effect and approaches the decomposition temperature; it is sensitive to injection pressure changes, so flow adjustment should follow the pressure and speed route
Solution
①To improve flow, prioritize increasing injection pressure and speed; ②set temperature only according to the window baseline; ③if necessary, reduce nozzle size to increase shear; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
The correct means of adjusting POM flow is pressure, not temperature; the temperature-raising route is a typical wrong direction for POM; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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