Injection Molding
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EVA internal stress concentration is severe
Problem Phenomenon
EVA product internal stress >15MPa causes cracking during storage
Cause Analysis
Injection speed too fast with large orientation stress; uneven cooling freezing thermal stress; improper gate position with concentrated flow orientation
Solution
1) Reduce injection speed to decrease orientation; 2) Uniform mold temperature to reduce thermal stress; 3) Annealing at 80°C/4h to release stress; 4) Optimize gate position
Key Takeaway
Internal stress is caused by fast injection and uneven cooling; reducing speed, uniform cooling, and annealing are key
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