Blow Molding
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EMA Extrusion '2079851475616104457 Severe Parison Sag
Fenómeno do problema
EMA extrusion '2079851475616104457 parison sag of 20-40mm causes the bottle bottom wall thickness to be only 0.3-0.4mm
Análise das causas
EMA melt strength low, parison stretches and thins under gravity; parison extrusion speed slow, increasing sag time; parison temperature high, viscosity low, aggravating sag
Solução
1) Add 0.3-0.5wt% slight crosslinking agent to increase melt strength; 2) Increase parison extrusion speed to shorten sag time; 3) Lower parison temperature by 10-15°C to increase viscosity; 4) Wall thickness controller to compensate sag
Conclusão principal
Parison sag is caused by low melt strength; slight crosslinking and wall thickness control are key
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