Processing Machinery
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PCABS shutdown and restart
Problem Phenomenon
【Problem Phenomenon】PC/ABS directly starts up after shutdown, the first batch of parts has poor quality
Cause Analysis
After shutdown, the barrel material accumulates heat history, direct production at restart brings degraded material into parts; insufficient preheating also causes uneven melt temperature; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based on experience alone
Solution
Fully preheat before restart and air-shoot to verify melt temperature; scrap the first 3-5 shots; empty and clean for long shutdowns; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PC/ABS restart preheats and air-shoots first, the first shots are scrapped without taking chances; 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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