Processing Machinery
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PCABS residence time management
Problem Phenomenon
【Problem Phenomenon】PC/ABS parts discolor and show silver streaks after production interruption, heat history accumulates
Cause Analysis
PC/ABS stays too long in the barrel, the PC phase undergoes thermo-oxidative degradation; during interruption, the temperature should be lowered or the barrel emptied, refer to pure PC residence 6-12 minute level management; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based on experience alone
Solution
For interruption over 15 minutes, lower the barrel temperature; empty for long interruptions; scrap and verify the first batch after restart; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PC/ABS residence time must be managed, temperature reduction during interruption is discipline; 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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