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