Extrusion & Post
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PVA internal delamination cracking
Problem Phenomenon
PVA product interior delaminates and cracks along the interface
Cause Analysis
Poor interfacial bonding between PVA and incompatible filler or blend components; cooling shrinkage differences cause interlayer stress
Solution
1) Use compatibilizer to improve interfacial bonding; 2) Uniform cooling to reduce interlayer stress; 3) Reduce the amount of incompatible components added
Key Takeaway
Internal delamination is caused by poor interface and shrinkage difference; compatibilizer and uniform cooling are the key
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