Processing Machinery
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Glossless surface of random copolymer polypropylene pipe special material extruded products (Variant: mass production scenario)
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.
In particular, in continuous mass production, this problem is more prominent and needs key attention.
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
（6）In continuous mass production, process parameter fluctuations or equipment status changes have aggravated this problem
Lösung
（1）Raise the die temperature to the higher value within the range of 200-220°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 200-220°C
（5）Select raw material grades with good glossiness and control the filler content
（6）And establish standardized work instructions, with special attention to parameter stability in continuous mass production
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.
In different production scenarios, targeted preventive measures need to be taken.
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