Injection Molding
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PA6 '2079851475616104452 Metering Fluctuation
Fenómeno do problema
Cushion fluctuation and unstable weight, short shots and flash alternating.
Análise das causas
PA6 solidifies quickly, and slight leakage of the check ring affects metering; unstable feeding also does; low-viscosity material has high requirements for check ring sealing; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience.
Solução
①Disassemble and check the wear and sealing of the check ring, and replace it when necessary;②check hopper feeding and throat cooling to ensure stable and smooth feeding;③stabilize the back pressure setting to ensure consistency of plasticization and metering;④continuously monitor cushion fluctuation as an early warning of metering stability;⑤clean the screw head.
Conclusão principal
Stable PA6 metering = 'check ring health': low-viscosity nylon has extremely high requirements for check ring sealing; cushion fluctuation is the most intuitive alarm; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence.
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