Injection Molding
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PARA Jetting Marks
Problem Phenomenon
Jetting snake marks appear in front of the gate of PARA products; improper injection point position and speed, with high-viscosity melt jetting.
Cause Analysis
Improper injection point position with melt rushing straight; too-fast initial injection speed with melt jetting; too-small injection point cross-sectional area with concentrated shear; PARA high-flow grades are still subject to jetting rules.
Solution
①Modify the injection point position to avoid straight rushing; ②Reduce the initial injection speed; ③Enlarge the injection point cross-sectional area; ④Multi-stage injection passing slowly through the gate area.; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PARA jetting marks require both gate design and speed control; injection point position is a structural factor; initial speed management is the key process.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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