Molding Process 3 visualizações

PU hardness too low

Fenómeno do problema

PU product Shore hardness 5-10 degrees lower than target, soft to touch

Análise das causas

PU soft nature, low hardness; too much plasticizer or softener added; crystallinity too low

Solução

1) Add rigid filler 5-10wt% to increase hardness; 2) Reduce plasticizer dosage; 3) Increase cooling rate to increase crystallinity

Conclusão principal

Low hardness is caused by material softness and excessive plasticization; adding filler is key

PU low hardness rigid filler plasticizer crystallization control

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