Blow Molding
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Glass Fibre extrusion '2079851475616104457 parison severe sag
Problem Phenomenon
Glass Fibre extrusion '2079851475616104457 parison sag 20-40mm, causing bottle bottom wall thickness only 0.3-0.4mm
Cause Analysis
Glass Fibre melt strength low, parison stretches thinner under gravity; parison extrusion speed slow increases sag time; parison temperature too high, viscosity low, aggravates sag
Solution
1) Add slight crosslinking agent 0.3-0.5wt% to increase melt strength; 2) increase parison extrusion speed to shorten sag time; 3) reduce parison temperature 10-15°C to increase viscosity; 4) wall thickness controller compensates sag
Key Takeaway
Parison sag is caused by low melt strength; slight crosslinking and wall thickness control are key
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