Molding Process 5 views

EVA foam shrinkage is large

Problem Phenomenon

EVA foamed shoe sole 24h shrinkage >5%

Cause Analysis

Cell gas diffuses out causing shrinkage; crosslinking <60% with poor recovery aggravates shrinkage

Solution

1) Increase DCP to 0.5-0.8wt% with crosslinking >60%; 2) Reduce foaming temperature by 5-10°C; 3) 80°C/1h post-treatment; 4) VA18-28% moderate

Key Takeaway

EVA foam shrinkage is caused by gas diffusion and insufficient crosslinking; increasing crosslinking degree is key

EVA foam shrinkage crosslinking degree DCP post-treatment VA content

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