Material Drying
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Bubbles in PLA '2079851475616104452 after moisture absorption
Fenómeno del problema
Bubbles appear on the surface and inside of PLA products.
Análisis de la causa
PLA has strong hygroscopicity; when drying is insufficient, the moisture content is high (>500ppm), and water vapor produces bubbles during processing.
Solución
Drying conditions: 60-80°C/4-6h (amorphous grade) or 80-100°C/2-3h (crystalline grade) to moisture <250ppm.
Conclusión clave
The hygroscopicity of PLA is the first obstacle to processing quality.
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