Material Analysis
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PLA Melt Temperature 170-230℃
Problem Phenomenon
Low melt temperature causes poor plasticization; high temperature causes a sharp viscosity drop, product embrittlement and discoloration
Cause Analysis
PLA melting point is 155-185℃, processing window 170-230℃; it is recommended to set the heater 40-50℃ above the melting point; above 240℃ degradation accelerates, and molecular weight and viscosity drop rapidly
Solution
①Melt temperature 170-230℃ adjusted according to the process; ②Sheet extrusion 170-230℃; ③Try not to exceed 240℃, over-temperature processes paired with 50ppm drying
Key Takeaway
PLA temperature window 170-230℃; the setting principle of 40-50℃ above the melting point balances plasticization and degradation prevention; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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