Injection Molding
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PA66 '2079851475616104452 multi-cavity imbalance
Problem Phenomenon
Differences between cavities, inconsistent weight and dimensions.
Cause Analysis
Runner/cooling imbalance; high-temperature material is sensitive to pressure; cavity differences are amplified; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience.
Solution
①Runners geometrically balanced with equal length and equal diameter, or adopt a naturally balanced layout; ②use the short shot method (step filling) to locate the last fill point; ③check and balance cooling water flow of each cavity; ④independent throttling/sequential control of each hot runner gate if necessary; ⑤establish cavity number traceability and SPC to facilitate locating problem cavities.
Key Takeaway
PA66 multi-cavity='balance': hardware balance of runners and cooling is fundamental; measure filling balance first before talking about process; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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