Molding Process
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EVOH Hardness Too Low
Problem Phenomenon
EVOH product Shore hardness 5-10 degrees below target, soft to the touch
Cause Analysis
EVOH soft nature, hardness low; plasticizer or softener added too much; crystallinity too low
Solution
1) Add rigid filler 5-10wt% to increase hardness; 2) Reduce plasticizer amount; 3) Increase cooling rate to raise crystallinity
Key Takeaway
Low hardness is caused by material softness and excessive plasticization; adding filler is key
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