Molds & Tooling
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PMMA shrinkage rate fluctuation
Problem Phenomenon
The dimensional shrinkage rate of products fluctuates between 0.2-0.8%.
Cause Analysis
PMMA is amorphous; shrinkage is related to holding pressure, mold temperature and cooling rate, and unstable process parameters cause shrinkage fluctuation.
Solution
Stabilize holding pressure and time; control mold temperature steadily; keep process parameters consistent for each shot.
Key Takeaway
PMMA shrinkage is dominated by process variables.
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