Blow Molding
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Severe Parison Sag in CMC Extrusion '2079851475616104457
Fenómeno del problema
In CMC extrusion '2079851475616104457, the parison sag is 20-40mm, resulting in a wall thickness of only 0.3-0.4mm at the bottle bottom
Análisis de la causa
CMC melt strength is low and the parison stretches and thins under gravity; slow parison extrusion speed increases sag time; high parison temperature and low viscosity aggravate sag
Solución
1)Add micro-crosslinking agent 0.3-0.5wt% 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 compensates for sag
Conclusión clave
Parison sag is caused by low melt strength; micro-crosslinking and wall thickness control are the key
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