Molds & Tooling
2 views
Uneven Internal Density of EVOH
Problem Phenomenon
Density differences of ±3% in different parts of EVOH products
Cause Analysis
Holding pressure transmission uneven, areas far from gate under-packed with lower density; regional crystallinity differences causing different densities
Solution
1) Optimize gate design for uniform holding pressure transmission; 2) Uniform mold temperature to reduce crystallization differences; 3) Multiple gates to improve holding pressure distribution
Key Takeaway
Uneven density is caused by uneven holding; optimizing gate design is key
Was this helpful?
0 people found this helpful
Thank you for your feedback!