Material Analysis
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EVOH Hardness Too High
Problem Phenomenon
EVOH product Shore hardness 5-10 degrees above target, hard to the touch
Cause Analysis
EVOH crystallinity too high, rigidity increased; filler added too much; cooling too fast, crystallization imperfect but rigidity frozen in
Solution
1) Reduce cooling rate to perfect crystallization and reduce hard feel; 2) Reduce filler addition; 3) Add plasticizer 0.5wt% to lower hardness
Key Takeaway
High hardness is caused by crystallization and filler; adjusting cooling and filler is key
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