Material Analysis
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Glossless surface of general-purpose polyethylene extruded products
Problembeschreibung
The surface of the extrudate is dull and lusterless, and the glossiness is significantly lower than that of the standard sample.
Glossless surface affects the appearance quality of the product and affects use in decorative products.
Ursachenanalyse
（1）The die temperature is low, and the melt surface cannot fully replicate the die surface
（2）The cooling rate is too fast, and the melt has no time to form a smooth surface
（3）The finish of the die inner wall is insufficient
（4）The melt temperature is low, and the flowability is poor
（5）The raw material contains fillers or additives that affect the gloss
Lösung
（1）Raise the die temperature to the higher value within the range of 160-260°C
（2）Appropriately reduce the cooling rate and increase the cooling water temperature
（3）Polish the die inner wall to Ra≤0.1μm, with chrome plating
（4）Appropriately raise the barrel temperature to the higher value within the range of 160-260°C
（5）Select raw material grades with good glossiness and control the filler content
Wichtigste Erkenntnis
Glossless surface is caused by low die temperature or too fast cooling, and the die temperature needs to be increased and the cooling slowed down.
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