Molds & Tooling
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PA66 air-trap burning
Fenómeno do problema
Black specks at the end, fixed position.
Análise das causas
Poor venting diesel effect; high-temperature processing makes burning easier; PA66 processing temperature is high and air-trap risk is great; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience.
Solução
①Open or clean vent grooves at the corresponding positions to ensure smooth gas discharge; ②reduce injection speed at the filling end to leave time for venting; ③clean vent grooves blocked by oil contamination to restore venting capacity; ④moderate clamping force to avoid pressing closed the parting line vent gap; ⑤reduce release agent usage to prevent vent contamination.
Conclusão principal
PA66 burning='venting': high-temperature nylon fears air traps more; the venting system is a life-saving design and daily cleaning must be in place; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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