Molding Process
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Shrinkage and bubbles of PMMA cast sheets
Fenómeno del problema
Cast PMMA sheets show uneven thickness and bubbles.
Análisis de la causa
During casting, monomer MMA polymerization shrinkage is large and reaction exotherm produces bubbles; temperature control improper.
Solución
Precisely control casting polymerization temperature; use pressurized and depressurized casting process; fully degas.
Conclusión clave
The quality of PMMA cast sheets depends on polymerization process control.
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