Processing Machinery
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PC/ABS holding pressure profile
Problem Phenomenon
Sink marks and flash coexist.
Cause Analysis
Improper holding pressure setting; imbalance between shrinkage compensation and overpacking.; 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
①Optimize holding pressure and time; ②staged holding pressure; ③set according to solidification time; ④verify balance.; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
The holding pressure profile must balance shrinkage compensation and overpacking.; 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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