Material Analysis
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Dull Surface of Polypropylene Extruded Products
Problem Phenomenon
The surface of the extrudate is dull and lusterless, and the gloss is obviously lower than that of the standard sample.
A dull surface affects the appearance quality of the product and affects use in decorative products.
Cause Analysis
(1) The die temperature is too 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 too low, and the fluidity is poor
(5) The raw material contains fillers or additives that affect the gloss
Solution
(1) Increase the die temperature to the higher value within the range of 200-280°C
(2) Appropriately reduce the cooling rate and increase the cooling water temperature
(3) Polish the inner wall of the die to Ra≤0.1μm, with chrome plating treatment
(4) Appropriately increase the barrel temperature to the higher value within the range of 200-280°C
(5) Select a raw material grade with good gloss and control the filler content
Key Takeaway
A dull surface is caused by low die temperature or excessive cooling; the die temperature needs to be increased and the cooling slowed down.
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