Blow Molding
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Severe parison sag in POE extrusion '2079851475616104457
Problem Phenomenon
POE extrusion '2079851475616104457 parison sag of 20-40mm causes the bottle bottom wall thickness to be only 0.3-0.4mm
Cause Analysis
POE melt strength is low, the parison stretches and thins under gravity; slow parison extrusion speed increases sag time; parison temperature too high, low viscosity aggravates sag
Solution
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 for sag
Key Takeaway
Parison sag is caused by low melt strength; slight crosslinking and wall thickness control are the key
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