Processing Machinery
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Product burnt spots/yellowing
Fenómeno del problema
Brown burnt spots appear locally on the product or the overall color is yellowish
Análisis de la causa
The PP matrix undergoes thermo-oxidative degradation at temperatures >230°C; the impregnation treatment agent on the glass fiber surface decomposes at high temperature; the material stays in the barrel too long
Solución
Strictly control the maximum processing temperature ≤240°C; shorten material residence time to <5 minutes; add antioxidant (such as 1010+168 compound system)
Conclusión clave
The LGFPP processing temperature window is narrow, and a balance must be found between plasticization and degradation
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