Extrusion & Post
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EVA internal delamination cracking
Problem Phenomenon
EVA product internal delamination cracking along the interface
Cause Analysis
Poor interfacial adhesion between EVA and incompatible fillers or blend components; cooling shrinkage differences causing interlayer stress
Solution
1) Use compatibilizer to improve interfacial adhesion; 2) Uniform cooling to reduce interlayer stress; 3) Reduce the addition amount of incompatible components
Key Takeaway
Internal delamination is caused by poor interface and shrinkage differences; compatibilizer and uniform cooling are key
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