Extrusion & Post
8 views
EVA and HDPE blend delamination
Problem Phenomenon
In EVA/HDPE cross-section, EVA concentrates in the inner layer
Cause Analysis
Large viscosity difference; low-viscosity EVA migrates toward the pipe wall
Solution
1) VA15-18% EVA with viscosity closer to HDPE; 2) Blending at 170-185°C to enhance compatibility; 3) EVA-g-MAH 1-2wt%
Key Takeaway
EVA/HDPE delamination is driven by viscosity difference; viscosity matching and compatibilizer are key
Was this helpful?
0 people found this helpful
Thank you for your feedback!