Extrusion & Post
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Weak Interfacial Adhesion in EVOH Coextrusion
Problem Phenomenon
EVOH/PE coextrusion interface adhesion <1N/15mm with delamination
Cause Analysis
EVOH is highly polar while PE is non-polar, interfacial adhesion is extremely low; no tie layer used
Solution
1) Set a tie layer between EVOH and PE (PE-g-MAH or EAA 5-10μm); 2) Coextrusion temperature ensuring full diffusion of the tie layer; 3) Increase tie layer thickness to 8-15μm
Key Takeaway
EVOH/PE interface polarity difference is large; a tie layer must be used to solve it
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