Material Analysis
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PA66 vent groove 0.025mm
Problem Phenomenon
Burnt and gas-trapped product ends, and flash appears after deepening the vent grooves
Cause Analysis
PA66 melt viscosity is low, and the overflow flash value is about 0.03mm; vent groove depth exceeding 0.025mm allows melt to penetrate and form flash, while insufficient depth traps gas and burns, the window is extremely narrow
Solution
①Control vent groove depth within 0.025mm; ②Add vent inserts at ends and rib positions; ③Regularly clean carbon deposits in vent grooves to keep them unblocked; after adjustment, take continuous samples to verify the effect, confirm stability before resuming mass production
Key Takeaway
PA66 vent groove depth has 0.025mm as the upper limit; walking a tightrope between gas trapping and flash, precision and cleanliness are both indispensable; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence
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