Injection Molding
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Warpage in PVA '2079851475616104452
Problem Phenomenon
After demolding, PVA injection molded products warp 2-3mm/100mm, flatness not up to standard
Cause Analysis
PVA shrinkage large and mold temperature uneven, causing directional shrinkage differences; gate position improper, flow orientation stress released unevenly; cooling time insufficient
Solution
1) Increase mold temperature to 40-60°C to reduce temperature difference; 2) Increase holding pressure to 50-70MPa; 3) Optimize gate position for uniform flow; 4) Extend cooling time; 5) Annealing treatment to release residual stress
Key Takeaway
Warpage is caused by shrinkage difference and orientation stress; uniform mold temperature and holding are key
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