Injection Molding
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PLA injection molded products yellowing and becoming brittle
Fenómeno del problema
PLA injection molded products appear yellow, and the brittleness increases.
Análisis de la causa
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.
Solución
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.
Conclusión clave
PLA has poor thermal stability, and temperature control and residence time are the keys.
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