Molding Process
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Shrinkage and bubbles of PMMA cast sheets
Fenómeno do problema
Cast PMMA sheets show uneven thickness and bubbles.
Análise das causas
During casting, monomer MMA polymerization shrinkage is large and reaction exotherm produces bubbles; temperature control improper.
Solução
Precisely control casting polymerization temperature; use pressurized and depressurized casting process; fully degas.
Conclusão principal
The quality of PMMA cast sheets depends on polymerization process control.
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