Molding Process
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Shrinkage and bubbles of PMMA cast sheets
Problem Phenomenon
Cast PMMA sheets show uneven thickness and bubbles.
Cause Analysis
During casting, monomer MMA polymerization shrinkage is large and reaction exotherm produces bubbles; temperature control improper.
Solution
Precisely control casting polymerization temperature; use pressurized and depressurized casting process; fully degas.
Key Takeaway
The quality of PMMA cast sheets depends on polymerization process control.
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