Injection Molding
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PLA injection molded products yellowing and becoming brittle
Problembeschreibung
PLA injection molded products appear yellow, and the brittleness increases.
Ursachenanalyse
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.
Lösung
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.
Wichtigste Erkenntnis
PLA has poor thermal stability, and temperature control and residence time are the keys.
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