Material Analysis
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PA66 narrow processing temperature window
Fenómeno do problema
Producing with ordinary nylon process results in either poor filling or yellowing degradation, quality extremely unstable.
Análise das causas
PA66 melting point is about 260℃, processing window 270~290℃, only 20~30℃ above the melting point; if the temperature is low, flow is poor and filling is inadequate, if high, thermal degradation occurs; above 300℃ molecular weight drops rapidly and intrinsic viscosity falls more than 20% in a short time.
Solução
①Strictly control melt temperature at 270~290℃; ②mold temperature 80~100℃; ③use precise temperature control equipment and calibrate with measured melt temperature; ④shorten melt residence time in the barrel to reduce heat accumulation degradation; ⑤calibrate the process with measured melt temperature.
Conclusão principal
PA66='narrow window material': temperature control precision is the threshold; a 20~30℃ window means temperature control equipment and measured calibration must be in place; crude temperature adjustment does not work on PA66.
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