Molds & Tooling
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PMMA Thick-Wall Mold Temperature
Problem Phenomenon
Shrinkage cavities and bubbles coexist inside PMMA thick-wall products
Cause Analysis
Uneven cooling at thick-wall areas; after the outer layer solidifies, insufficient core feeding compensation forms shrinkage cavities, and residual monomer is released forming bubbles; During on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based on experience alone.
Solution
Raise mold temperature to 80℃; extend holding pressure time; enlarge the gate; staged cooling when necessary; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Key Takeaway
Thick-wall PMMA requires high mold temperature and long holding pressure to prevent shrinkage cavities; 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 future problems.
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