TPU melt fracture causing surface defects

Problembeschreibung

Periodic irregular wrinkles on the extrusion and injection surfaces

Ursachenanalyse

The shear stress at the die exit exceeds the critical value, elastic instability

Lösung

Reduce the extrusion speed, raise the die temperature, increase the gap

Wichtigste Erkenntnis

A typical rheological problem in extrusion processing

TPU、melt fracture

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