Material Drying
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PLA insufficient drying and hydrolysis
Problem Phenomenon
PLA products show bubbles and silver streaks with reduced strength, which improves after drying.
Cause Analysis
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.
Solution
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.
Key Takeaway
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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