Injection Molding
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PA66 injection molded product material shortage—venting type
Problem Phenomenon
Fixed-point repeated material shortage, pressure increase ineffective.
Cause Analysis
End air trap; poor venting; blindly increasing pressure only produces flash elsewhere; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience; during troubleshooting, confirm item by item around key factors such as material shortage and venting to avoid misjudgment.
Solution
①Open or clean vent grooves at the corresponding positions to ensure smooth gas discharge; ②use the short shot method (step filling) to locate the last fill point; ③adjust gate position/number to change melt flow direction and convergence position; ④reduce injection speed at the filling end to leave time for venting; ⑤check whether clamping force is too large pressing closed the vent gap.
Key Takeaway
PA66 fixed-point material shortage='venting': short shot method locates, open vents at fixed points; if the air trap is not removed, the higher the pressure the more defects; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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