Molds & Tooling
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PSU Jetting Tendency and Gate Layout
Problem Phenomenon
[Problem Phenomenon] Jetting marks and snake marks near the gate of PSU products; poor appearance quality
Cause Analysis
PSU melt has a jetting tendency when entering the cavity; the melt should hit the cavity wall or pins soon after entering to fill along the wall; gate layout facing directly into the open cavity inevitably jets; During on-site troubleshooting, verify item by item according to this mechanism, avoiding blindly adjusting the machine based solely on experience
Solution
Arrange the gate facing the core or wall so the melt hits the wall as soon as possible; use overlap gates to guide wall-following; reduce initial injection speed in coordination; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PSU naturally tends to jet; gates facing walls or pins is an iron rule of layout; After confirming effectiveness, solidify the parameters and practices into the work instructions to prevent recurrence; Include this case in the defect archive as a reference for troubleshooting similar problems in the future
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