Injection Molding
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PA66 '2079851475616104452 metering instability
Problem Phenomenon
Weight fluctuation, short shots and flash alternate.
Cause Analysis
Check ring wear (PA66 high temperature and high pressure accelerate wear); unstable feeding; low-viscosity materials have high sealing requirements; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience.
Solution
①Disassemble and inspect check ring wear and sealing, replace if necessary; ②check hopper feeding and throat cooling to ensure stable and smooth feeding; ③stabilize back pressure setting to ensure plasticizing and metering consistency; ④continuously monitor cushion fluctuation as an early warning of metering stability; ⑤clean the screw head.
Key Takeaway
PA66 metering='check ring health': high temperature and high pressure accelerate check ring wear; cushion fluctuation is the most intuitive alarm; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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