Molding Process 6 Aufrufe

PU hardness too low

Problembeschreibung

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

Ursachenanalyse

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

Lösung

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

Wichtigste Erkenntnis

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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