Processing Machinery
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Random copolymer polypropylene pipe special material (Nordic standard） extruded products surface lusterless（Variant: Strengthened Measures）
Problem Phenomenon
The extrudate surface is dull and lusterless, with gloss obviously lower than the standard sample.
A lusterless surface affects product appearance quality and affects use in decorative products.In particular, extra attention is needed on top of the original basis, this problem is more prominent and requires key attention.
Cause Analysis
（1）The die temperature is too low, the melt surface fails to fully replicate the die surface\
（2）Cooling rate too fast, the melt has no time to form a smooth surface\
（3）The die inner wall finish is insufficient\
（4）Melt temperature too low, flowability poor\
（5）The raw material contains fillers or additives affecting gloss\
（6）On top of the original basis, extra attention is needed: process parameter fluctuations or equipment status changes aggravate this problem
Solution
（1）Increase the die temperature to the higher value within the 200-220°C range\
（2）Appropriately reduce the cooling rate, increase the cooling water temperature\
（3）Polish the die inner wall to Ra≤0.1μm, chrome plating treatment\
（4）Appropriately increase the barrel temperature to the higher value within the 200-220°C range\
（5）Select raw material grades with good gloss, control filler content\
（6）And strengthen process monitoring; on top of the original basis, extra attention is needed, paying special attention to parameter stability
Key Takeaway
A lusterless surface is caused by low die temperature or too fast cooling, requiring increased die temperature and slowed cooling.Targeted preventive measures need to be taken in different production scenarios.
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