Material Drying
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PVC Equipment Corrosion
Fenómeno del problema
Pitting and rust appear on screw, barrel, and die head, lifespan sharply reduced, processing precision and stability decline accordingly.
Análisis de la causa
HCl released by degradation forms hydrochloric acid with water vapor to corrode metal; long-term degraded operation, high raw material moisture, and shutdown without replacing PVC all accelerate corrosion; corrosion in turn produces more retention points, forming a vicious circle.
Solución
①Eliminate thermal degradation operation, reduce HCl at the source; ②Replace PVC with purging material before shutdown; ③Use corrosion-resistant materials/coated screws and die heads; ④Control raw material moisture; ⑤Regularly inspect corrosion-prone parts and maintain them.
Conclusión clave
PVC corrosion = an 'HCl management' problem: shutdown replacement is an iron rule; corrosion is irreversible equipment damage — corrosion-resistant materials + standardized shutdown are far more economical than replacing screws afterwards; prevent before it happens.
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