Material Drying
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PLA insufficient drying and hydrolysis
Fenómeno del problema
PLA products show bubbles and silver streaks with reduced strength, which improves after drying.
Análisis de la causa
PLA easily absorbs moisture from the environment; moisture triggers hydrolysis, breaking ester bonds and reducing molecular weight; hydrolysis simultaneously produces apparent defects such as bubbles and silver streaks and deterioration of mechanical properties.
Solución
① Dehumidify and dry at 60~80℃ for more than 4 hours before processing; ② reduce moisture content to below 0.02%; ③ store sealed and open as needed; ④ shorten exposure time in humid environments.
Conclusión clave
PLA moisture sensitivity runs through the entire storage and processing process; hydrolysis is irreversible, and drying is the only means to protect molecular weight.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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