Molding Process 3 views

EVA foam becomes hard due to excessive crosslinking

Problem Phenomenon

EVA foam crosslinking >85%, hardness C55, feels hard when worn with poor elasticity

Cause Analysis

DCP >1wt% too high; crosslinking time too long; temperature >180°C

Solution

1) Reduce DCP to 0.4-0.6wt% with crosslinking 60-70%; 2) Crosslinking time 6-8min; 3) Temperature 160-175°C

Key Takeaway

Excessive crosslinking is caused by too much DCP; moderate crosslinking is key

EVA foam excessive crosslinking DCP dosage crosslinking time hardness control

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