Molds & Tooling
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PMMA Overpacking Cracking
Problem Phenomenon
PMMA products crack near the gate shortly after ejection from the mold
Cause Analysis
Excessive holding pressure makes gate area density too high and internal stress large, and stress releases after ejection causing cracking; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Optimize holding pressure and time; avoid overpacking in the gate area; anneal; after adjustment, take samples continuously to verify the effect, and resume mass production only after confirming stability; change only one variable at a time and record parameter changes to facilitate locating effective measures
Key Takeaway
Overpacking stress is released by holding optimization and annealing; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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