Material Analysis
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PVA hardness too high
Problem Phenomenon
PVA product Shore hardness 5-10 degrees higher than target, hard to the touch
Cause Analysis
PVA crystallinity on the high side, increased rigidity; too much filler added; cooling too fast, crystallization incomplete but rigidity frozen
Solution
1) Reduce cooling rate to make crystallization complete and reduce the hard feel; 2) Reduce filler addition; 3) Add plasticizer 0.5wt% to reduce hardness
Key Takeaway
High hardness is caused by crystallization and filler; adjusting cooling and filler are the key
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