Processing Machinery
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PVC Foam Board Uneven Cells
Fenómeno do problema
PVC free-foam board cells coarse and uneven, density fluctuates, affecting strength and appearance.
Análise das causas
Foaming agent decomposition mismatched with plasticization, uneven temperature field, insufficient foam regulator in formula; local overheating causing premature foaming or insufficient plasticization both make cells out of control; during on-site troubleshooting, verify item by item according to this mechanism, avoid blindly adjusting the machine based solely on experience.
Solução
①Make temperature field uniform, avoid local overheating or underheating; ②Match foaming agent decomposition temperature with plasticization progress; ③Adjust foam regulator dosage; ④Stabilize extrusion pressure, eliminate pulsation; ⑤Optimize formula system (additives, fillers, modifiers).
Conclusão principal
PVC foam board = 'rhythm matching of plasticization and foaming': foaming agent decomposition and plasticization progress must be synchronized; temperature field uniformity and foam regulator are the two pillars of uniform cells.
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