Molds & Tooling
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PA6 Trapped Air Burning
Problem Phenomenon
Black spots and scorch marks at the end of the cavity, with fixed positions.
Cause Analysis
Poor venting diesel effect; high-speed filling at the end compresses air and heats up; PA6 processing temperature is high, and the risk of trapped air burning is large; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience.
Solution
①Open vent grooves at corresponding positions;②reduce injection speed at the filling end to leave time for venting;③clean vent grooves clogged by oil;④moderate clamping force to avoid pressing closed the parting line vent gaps;⑤reduce the amount of release agent to prevent contamination of venting.
Key Takeaway
PA6 burning = 'poor venting': high-temperature nylon fears trapped air even more; opening and cleaning vent grooves is the focus of daily maintenance; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence.
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