Processing Machinery
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PCABS screw retraction
Problem Phenomenon
PC/ABS screw retraction sucks air, spray silver streaks, reduce retraction.
Cause Analysis
Excessive PC/ABS screw retraction (suck-back) draws air into the melt; spray pattern silver streaks; nozzle contact surface gap sucks in air; reduce retraction; nozzle seat inspection.
Solution
①Reduce screw retraction; ②nozzle seat inspection; ③gap elimination; ④spray silver streak identification; ⑤process adjustment.; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Air suction from PCABS screw retraction is the cause of silver streaks; reduction and inspection are both important; identification ensures accurate diagnosis.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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