Molds & Tooling
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PC/ABS hot runner dead corner
Problem Phenomenon
Intermittent black streaks.
Cause Analysis
Material accumulated in hot runner dead corners degrades and is released.; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based on experience alone; this mechanism has been repeatedly verified by industry data and should be confirmed first during troubleshooting
Solution
①Clean hot runner; ②dead-corner-free design; ③shorten residence; ④periodic records.; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability; change only one variable at a time and record the parameter changes, to facilitate locating the effective measures
Key Takeaway
Intermittent black streaks point to hot runner retention.; 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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