Processing Machinery
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PCABS Thermal Decomposition Silver Streaks
Problem Phenomenon
[Problem Phenomenon] PC/ABS silver streaks are accompanied by yellowing and discoloration, and product strength declines
Cause Analysis
Thermal decomposition type silver streaks: the barrel temperature is too high or the residence time is too long, and the PC phase degrades and produces gas; accompanied by discoloration and yellowing, the molecular weight has been damaged; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Reduce barrel temperature by 10-15°C; shorten residence time; check for local overheating at the front of the nozzle; thoroughly clean degraded material; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
Thermal decomposition silver streaks are accompanied by yellowing; reduce temperature, shorten residence time, and clean the barrel; 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 in the future
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