Processing Machinery
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PC/ABS silver streak (air entrapment type)
Problem Phenomenon
Silver streaks are scattered and jet-like, reduced after increasing back pressure.
Cause Analysis
Back pressure too low, air is sucked in when the screw retracts; the nozzle contact surface gap also draws in air to form jet streaks.; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based on experience alone
Solution
①Increase back pressure; ②reduce screw suck-back distance; ③check nozzle contact seal; ④adjust anti-drool amount.; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Air-type silver streaks have a scattered form; back pressure and nozzle seal are the troubleshooting points.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar problems later
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