Material Drying
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PVC Dry Blend Stratification
Fenómeno do problema
Dry blend performance fluctuates after storage and transport, product quality unstable.
Análise das causas
Large particle size/density differences between powder and additives, transport vibration stratifies; filler moisture absorption also affects; dry blend homogeneity is destroyed during storage and transport; during on-site troubleshooting, verify item by item according to this mechanism, avoid blindly adjusting the machine based solely on experience.
Solução
①Control additive particle size to match PVC powder to prevent stratification; ②Moisture-proof storage, control ambient humidity; ③Re-mix dry blend before use to restore uniformity; ④Shorten storage cycle, first-in first-out; ⑤Optimize dry blending process to ensure uniform mixing of powder and additives.
Conclusão principal
PVC dry blend = 'homogeneity management': particle size matching and moisture-proofing are key; dry blend stratification is a hidden quality fluctuation source, storage and transport must be managed well; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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