Molds & Tooling
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PPS Insufficient Filling Troubleshooting
Problem Phenomenon
Thin-walled complex parts are underfilled; after raising temperature and pressure they are still not fully filled and burnt marks appear
Cause Analysis
PPS insufficient filling is mostly due to: low temperature and insufficient fluidity, too-small gates and runners, poor venting, and too-thin wall thickness; after raising temperature and pressure to the upper limit, the solution must return to the structural side
Solution
①Increase temperature → pressure → speed in sequence; ②Enlarge the gate and runner; ③Calculate the flow-length ratio and add gates if necessary; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PPS short shot troubleshooting prioritizes temperature, with structure as the backstop; after the process reaches its limit, the gate and flow-length ratio are the fundamental solutions; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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