Material Analysis
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Dull surface of low density polyethylene extruded products
Problem Phenomenon
The extrudate surface is dull and lusterless, with gloss significantly lower than the standard sample.
Dull surface affects product appearance quality and use in decorative products.
Cause Analysis
(1) Die temperature too low; melt surface fails to fully replicate the die surface
(2) Cooling rate too fast; melt has no time to form a smooth surface
(3) Insufficient die inner wall finish
(4) Melt temperature too low, poor flowability
(5) Fillers or additives in raw material affect gloss
Solution
(1) Increase die temperature to the higher value within the 160-220°C range
(2) Appropriately reduce cooling rate, increase cooling water temperature
(3) Polish die inner wall to Ra≤0.1μm, chrome plating treatment
(4) Appropriately increase barrel temperature to the higher value within the 160-220°C range
(5) Select raw material grades with good gloss, control filler content
Key Takeaway
Dull surface is caused by low die temperature or too fast cooling; die temperature needs to be increased and cooling slowed.
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