Processing Machinery
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PA6 and PA66 Mixed Machine Material Change
Fenómeno del problema
After changing from PA66 to PA6, the product showed unmelted spots or degradation, with abnormal quality.
Análisis de la causa
The melting points of the two differ by 40℃, and the material change temperature setting was wrong: processing PA66 at PA6 temperature causes poor plasticization, and conversely PA6 overheats and degrades; not switching the temperature system is the root cause.
Solución
①For material change, reset the temperature according to the target material and stabilize for 15~20 minutes;②use purging material to thoroughly replace and clean during material change;③fully inspect the first article after material change to confirm thorough replacement;④record and execute the material change cleaning SOP;⑤avoid frequent cross changeover to reduce cross-contamination.
Conclusión clave
PA6/PA66 material change = 'temperature system switching': applying parameters is strictly prohibited; the 40℃ melting point difference determines that material change must reset the temperature and thoroughly replace, and cannot seek convenience.
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