Injection Molding
2 views
PLA injection molded products yellowing and becoming brittle
Problem Phenomenon
PLA injection molded products appear yellow, and the brittleness increases.
Cause Analysis
The processing temperature is too high (>210°C) or the residence time is long, causing PLA thermal degradation; PLA is prone to molecular chain breakage and racemization at high temperature, producing colored products.
Solution
Strictly control the melt temperature at 170-200°C; shorten the residence time; reduce the back pressure to reduce shear heat; use heat-resistant stabilized PLA grades.
Key Takeaway
PLA has poor thermal stability, and temperature control and residence time are the keys.
Was this helpful?
0 people found this helpful
Thank you for your feedback!