Molds & Tooling
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PPO Jetting Marks
Problem Phenomenon
[Problem Phenomenon] Snake-shaped jetting marks near the gate of PPO products, poor appearance
Cause Analysis
High-viscosity melt jets when passing through a small gate at high speed directly facing an empty cavity; the main cause is that the gate design does not guide the melt to hit the wall as soon as possible; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Use overlap or fan gates to guide wall-following filling; arrange the gate facing the core; reduce the initial speed through the gate; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PPO jetting is radically cured by gate wall-hitting arrangement, and fan and overlap gates are preferred; 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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