Material Analysis
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PA66 melt temperature 270-300℃
Problem Phenomenon
Products underfilled with coarse weld lines, or yellowing degradation and increasing black specks
Cause Analysis
PA66 melting point is about 260℃; melt temperature below 270℃ causes poor plasticizing and difficult flow; above 300℃ molecular weight drops rapidly, intrinsic viscosity can fall more than 20% in a short time
Solution
①Melt temperature 270-300℃, glass fiber reinforced grades 275-290℃ and not over 300℃; ②measure actual melt temperature to calibrate set values; ③empty the barrel and lower temperature when shutdown exceeds the time limit
Key Takeaway
PA66 temperature window is only 20-30℃ above the melting point, the narrowest among the four major nylons; 300℃ is an absolute red line, measured calibration cannot be omitted; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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