Molds & Tooling
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PPS Surface Jetting Marks
Problem Phenomenon
Snake-shaped jetting marks in front of the gate.
Cause Analysis
High-speed filling jetting; PPS's low viscosity makes jetting more likely.; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience; this mechanism has been repeatedly verified by industry data and should be confirmed first during troubleshooting
Solution
①Multi-stage injection with low initial speed; ②enlarge the gate; ③adjust gate position; ④increase mold temperature.; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Jetting marks are controlled by the speed curve; low-viscosity materials need more attention.; 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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