Molding Process
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EVA foam hardness is too high
Problem Phenomenon
EVA foamed shoe sole Shore C50 is higher than C35-40
Cause Analysis
Density >0.3 with few cells, thick walls and hardness; crosslinking >80% with insufficient elasticity
Solution
1) Increase AC to 0.8-1wt% to reduce density to 0.25g/cm³; 2) Reduce DCP to 0.4-0.5wt% with crosslinking 60-70%; 3) VA18-28% to reduce viscosity and promote expansion
Key Takeaway
High hardness is caused by high density and excessive crosslinking; reducing density and moderate crosslinking are key
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