Injection Molding
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PA6 '2079851475616104452 Multi-cavity Imbalance
Problem Phenomenon
Differences between cavities, inconsistent weight and dimensions.
Cause Analysis
Unbalanced runners and cooling differences; PA6 is sensitive to pressure and temperature, and differences between cavities are amplified; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience.
Solution
①Make runners geometrically balanced with equal length and diameter, or adopt a naturally balanced layout;②test with the short shot method;③check and balance the cooling water channel flow of each cavity;④when necessary, independent throttling/sequential control of each hot runner gate;⑤establish cavity number traceability and SPC to facilitate locating problem cavities.
Key Takeaway
PA6 multi-cavity = 'balance test': the hardware balance of runners and cooling is fundamental; test filling balance first, then talk about the process window; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence.
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