Molding Process
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LDPE Film Surface Orange Peel/Melt Fracture
Problembeschreibung
The film surface is orange-peel rough and gloss decreases.
Ursachenanalyse
Exit shear stress exceeds the critical value; die temperature is low and line speed is high.
Lösung
①Raise the die temperature by 3~5℃; ②reduce line speed; ③polish die lips; ④add PPA.
Wichtigste Erkenntnis
Film surface orange peel = exit shear exceeding the limit.
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