Material Analysis
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No Gloss on the Surface of High-Density Polyethylene Extruded Products
Problem Phenomenon
The extrudate surface is dull and lusterless, and the glossiness is significantly lower compared with the standard sample.
The lack of surface gloss affects the appearance quality of the product and affects use in decorative products.
Cause Analysis
（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 inner wall of the die 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
Solution
（1）Increase the die temperature to a higher value within the 180-260°C range
（2）Appropriately reduce the cooling rate and increase the cooling water temperature
（3）Polish the inner wall of the die to Ra≤0.1μm and perform chrome plating
（4）Appropriately increase the barrel temperature to a higher value within the 180-260°C range
（5）Select raw material grades with good glossiness and control the filler content
Key Takeaway
The lack of surface gloss is caused by low die temperature or excessive cooling, and it is necessary to increase the die temperature and slow down the cooling.
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