Material Drying
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PCABS Silver Streaks Still Appear After Drying
Problem Phenomenon
PC/ABS silver streaks still appear after passing drying verification; investigate back pressure and residence time.
Cause Analysis
PC/ABS silver streaks still appear after sufficient drying; excessive back pressure causes shear thermal degradation; excessive residence time causes thermal decomposition; screw retraction sucks in air; the gap on the nozzle contact surface sucks in air; cold slug well is missing.
Solution
①Reduce back pressure in 50 psi steps; ②shorten residence time; ③reduce screw retraction; ④check nozzle seat; ⑤confirm cold slug well.; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
Equipment and process troubleshooting of PCABS silver streaks after drying is a deep diagnosis; back pressure and residence time are common omissions; systematic adjustment.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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