Injection Molding
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PSU Injection Pressure and Filling Time
Problem Phenomenon
[Problem Phenomenon] PSU short shots from insufficient filling pressure alternate with flash from overpressure; the parameter window is narrow
Cause Analysis
PSU high viscosity requires relatively high injection pressure (reference about 58MPa or above, adjusted per part) coordinated with about 1.5-second fast filling; pressure transmission loss is large under high viscosity; thin-wall parts need high pressure and fast speed even more
Solution
Set injection pressure according to flow path and wall thickness with margin; filling time target at the 1.5-second level; enlarge runners and gates to reduce pressure loss; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PSU needs high-pressure fast filling; 58MPa-level pressure paired with 1.5-second rhythm; After confirming effectiveness, solidify the parameters and practices into the work instructions to prevent recurrence
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