Material Analysis
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PA6 Melt Temperature 240-270°C
Problem Phenomenon
Products yellow and degrade, or are underfilled with coarse and obvious weld lines
Cause Analysis
PA6's melting point is about 220°C; melt temperature below 240°C results in poor plasticization and high viscosity; above 270°C, thermal degradation occurs with even slightly longer residence, and the temperature window is much narrower than that of PP and PE, requiring precise control
Solution
①Melt temperature 240-270°C, Toray AMILAN recommends 245-280°C; ②melt temperature affects viscosity far more than shear, so adjust temperature first when adjusting flow; ③calibrate the settings with actual measured melt temperature
Key Takeaway
PA6 viscosity is highly sensitive to temperature; using temperature rather than speed to adjust flow within the 240-270°C window is the basic operating logic for this material; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence
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