Material Drying
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PMMA Thick-Wall Part Internal Bubbles/Voids
Problem Phenomenon
Internal holes in thick-wall transparent parts.
Cause Analysis
Thick walls cool slowly, and core shrinkage forms vacuum bubbles; or insufficient drying.
Solution
①Verify drying; ②Extend holding pressure and slow cooling; ③Reduce material in thick walls; ④Optimize mold temperature.
Key Takeaway
Thick-wall bubbles = two divisions: water and vacuum.
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