Injection Molding
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PA6 Injection Product Material Shortage—Venting Type
Problem Phenomenon
Repeated material shortage at fixed positions, and pressure increase was ineffective.
Cause Analysis
Trapped air back pressure at the last filling point; poor venting; blindly increasing pressure will only produce flash elsewhere; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience.
Solution
①Open venting at the material shortage location;②use the short shot method (stepwise filling) to locate the last filling point;③adjust gate position/quantity to change the material flow direction and confluence position;④reduce injection speed at the filling end to leave time for venting;⑤check whether the clamping force is too large and presses closed the vent gaps.
Key Takeaway
PA6 fixed-point material shortage = 'venting': locating with the short shot method and opening venting at fixed points is the radical cure; if trapped air is not removed, the higher the pressure, the more defects; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence.
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