Extrusion & Post
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Internal delamination cracking of PU
Problem Phenomenon
Internal delamination of PU products, cracking along the interface
Cause Analysis
Poor interfacial bonding between PU and incompatible fillers or blend components; cooling shrinkage difference causing interlayer stress
Solution
1) Use compatibilizer to improve interfacial bonding; 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 difference; compatibilizer and uniform cooling are key
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