Injection Molding
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Large shrinkage difference between the melt flow direction and the perpendicular direction
Problem Phenomenon
The product has large shrinkage difference between the melt flow direction and the perpendicular direction, producing anisotropic warpage
Cause Analysis
Melt flow orientation causes molecular chains to align along the flow direction
Single gate position, obvious orientation direction
Uneven mold cooling, cooling rate differences in all directions
Injection speed too fast, orientation intensified
Cellulose acetate butyrate molecular chains are rigid, difficult to relax after orientation
Solution
Multi-gate design to reduce unidirectional orientation
Optimize cooling to be uniform in all directions
Appropriately reduce injection speed to reduce orientation
Increase the mold temperature to the higher value of 40-80°C to promote molecular relaxation
Annealing treatment to eliminate orientation stress
Key Takeaway
Orientation warpage requires reducing orientation and promoting relaxation
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