Material Analysis
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Non-glossy surface of linear low-density polyethylene extruded products
Problem Phenomenon
The extrudate surface is dull and lusterless, with gloss significantly lower than the standard sample.
A non-glossy surface affects product appearance quality and affects use in decorative products.
Cause Analysis
(1) Die temperature is on the low side, and the melt surface cannot fully replicate the die surface
(2) Cooling rate is too fast, and the melt has no time to form a smooth surface
(3) Die inner wall finish is insufficient
(4) Melt temperature is on the low side and fluidity is poor
(5) The raw material contains fillers or additives that affect gloss
Solution
(1) Increase die temperature to the higher value within the 190-250°C range
(2) Appropriately reduce the cooling rate and increase cooling water temperature
(3) Polish the die inner wall to Ra≤0.1μm, with chrome plating treatment
(4) Appropriately increase barrel temperature to the higher value within the 190-250°C range
(5) Select raw material grades with good gloss and control filler content
Key Takeaway
A non-glossy surface is caused by low die temperature or too fast cooling; die temperature needs to be increased and cooling slowed.
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