Molds & Tooling
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PPO Short Shot and Insufficient Filling
Problem Phenomenon
[Problem Phenomenon] Material shortage at the end of PPO thin-walled or long-flow products; increasing pressure and temperature gives limited improvement
Cause Analysis
PPO has poor fluidity as a near-Newtonian fluid; when wall thickness is below 0.8mm or flow length is too large, the front freezes causing short shot; too-small gates and runners and poor venting aggravate it
Solution
Check wall thickness ≥0.8mm and flow length ratio; raise melt temperature and mold temperature to the upper limit of the window; enlarge gates and runners; strengthen end venting; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
For PPO short shot first measure wall thickness and flow length, then check temperature, gate and venting in sequence; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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