Molding Process
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Glass Fibre extruded film thick edges and thin middle
Problem Phenomenon
Glass Fibre extruded film edges 20-30% thicker than middle, thickness shows U-shaped distribution
Cause Analysis
Die flow channel design improper, edge resistance low, flow large; Glass Fibre melt elasticity swells more at edges; air ring cooling has different effect at edges
Solution
1) Die adopts coat-hanger design to balance middle and edge resistance; 2) die gap fine adjustment, middle slightly larger, edges slightly smaller as compensation; 3) air ring edge air volume slightly reduced; 4) add restrictor bar to adjust edge flow
Key Takeaway
U-shaped thickness is caused by die flow channel and swell differences; coat-hanger die and gap fine adjustment are key
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