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