Processing Machinery
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No gloss on the surface of polyolefin plastomer extruded products (Variant: Enhanced Measures)
Problem Phenomenon
The surface of the extrudate is dull and lusterless, and the gloss is significantly lower compared with the standard sample.
The glossless surface affects the appearance quality of the product and affects use in decorative products.
In particular, additional attention is needed on the original basis; this problem is more prominent and requires focused attention.
Cause Analysis
（1）The die temperature is too low, and the melt surface fails to 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 too low and the flowability is poor
（5）The raw material contains fillers or additives that affect gloss
（6）On the original basis, additional attention is needed: fluctuations in process parameters or changes in equipment status have aggravated this problem
Solution
（1）Raise the die temperature to the higher value within the range of 180-230°C
（2）Appropriately reduce the cooling rate and raise the cooling water temperature
（3）Polish the die inner wall to Ra≤0.1μm, with chrome plating treatment
（4）Appropriately raise the barrel temperature to the higher value within the range of 180-230°C
（5）Select raw material grades with good gloss and control the filler content
（6）And strengthen process monitoring; on the original basis, additional attention is needed to pay special attention to parameter stability
Key Takeaway
The glossless surface is caused by low die temperature or excessive cooling, and it is necessary to raise the die temperature and slow down cooling.
Targeted preventive measures need to be taken in different production scenarios.
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