Material Analysis 9 views

EVA foam density is too high

Problem Phenomenon

EVA foamed shoe material density 0.35 is higher than 0.25g/cm³

Cause Analysis

Insufficient AC or incomplete decomposition; VA<15% high viscosity suppresses expansion; insufficient crosslinking

Solution

1) AC 0.8-1.2wt%; 2) VA18-28% to reduce viscosity and promote expansion; 3) Foaming at 170-180°C; 4) DCP 0.4-0.6wt% to stabilize cells

Key Takeaway

EVA foam density is determined by the blowing agent, VA content, and crosslinking degree

EVA foam high density AC blowing agent VA content DCP crosslinking

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