Molding Process 5 views

EVA foam surface large bubbles

Problem Phenomenon

EVA foam large bubbles >2mm

Cause Analysis

AC locally agglomerated with decomposed large amounts of gas concentrated; foaming temperature too high with local overheating

Solution

1) AC masterbatch method to ensure dispersion without agglomeration; 2) Temperature ±2°C; 3) DCP masterbatch method for uniform crosslinking

Key Takeaway

Large bubbles are caused by blowing agent agglomeration and uneven temperature; masterbatch method is key

EVA foam large bubbles AC agglomeration foaming temperature uniform crosslinking

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