Injection Molding
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PSU Melt Fracture and Filling Speed
Problem Phenomenon
[Problem Phenomenon] When filling at increased injection speed, melt fracture marks appear on the PSU product surface
Cause Analysis
Excessive injection speed causes melt fracture in PSU melt, conversely limiting filling speed and causing filling difficulty; the shear rate upper limit of high-viscosity materials constrains the room for speed increase
Solution
Control injection speed below medium-high speed to avoid melt fracture; for insufficient filling, prioritize raising melt temperature and mold temperature; enlarge runners and gates to reduce shear; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PSU speed increase has a melt fracture ceiling; filling relies on temperature, not brute-force speed increase; After confirming effectiveness, solidify the parameters and practices into the work instructions to prevent recurrence
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