Processing Machinery
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PA66 and PA6 temperatures cannot be borrowed from each other
Problem Phenomenon
Using PA6's 240-270℃ process to process PA66 causes poor plasticizing and short shots; the reverse causes severe PA6 degradation
Cause Analysis
PA66 melting point 260℃ is 40℃ higher than PA6, the two melt temperature ranges do not overlap at all; material changeover on the same machine must replace the entire temperature curve, borrowing parameters inevitably leaves one side undercooked and the other overheated
Solution
①After material changeover, reset barrel temperatures and stabilize 15-20 minutes before production; ②use HDPE etc. as transition material for thorough purging during changeover; ③archive temperature curves by grade for recall
Key Takeaway
PA6 and PA66 are of the same family but different windows; material changeover must change the full set of parameters and fully stabilize, transition-period products are isolated and handled separately; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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