Injection Molding
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PA6 '2079851475616104452 Metering Fluctuation
Problem Phenomenon
Cushion fluctuation and unstable weight, short shots and flash alternating.
Cause Analysis
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.
Solution
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.
Key Takeaway
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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