Material Analysis
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Glossless surface of heat-resistant polyethylene extruded products
Problem Phenomenon
The surface of the extrudate is dull and lusterless, and the gloss is obviously lower compared with the standard sample.
Surface glosslessness affects the appearance quality of products and affects 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) Die inner wall finish insufficient
(4) Melt temperature too low, poor fluidity
(5) Raw material contains fillers or additives affecting gloss
Solution
(1) Increase die temperature to the higher value within 190-230°C
(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 190-230°C
(5) Select raw material grades with good gloss, control filler content
Key Takeaway
Surface glosslessness is caused by low die temperature or too fast cooling, and the die temperature needs to be increased and cooling slowed down.
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