Material Analysis
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PA66 recycled material thermal history
Fenómeno del problema
After blending recycled material, strength decreases and color difference is obvious, and performance falls off a cliff after multiple cycles
Análisis de la causa
PA66 molecular weight decreases with each thermal history experienced, and oxidation and contamination of recycled material superimpose; after multiple cycles, impact and tensile properties deteriorate cliff-like, and appearance color difference amplifies synchronously
Solución
①Control recycled material ratio within 20%; ②Test melt index and mechanical properties by batch; ③Restrict or prohibit recycled material for load-bearing parts and appearance parts; after adjustment, take continuous samples to verify the effect, confirm stability before resuming mass production
Conclusión clave
PA66 recycled material value decreases with thermal history; ratio, detection, and use grading are the three iron rules of recycled use; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence
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