Processing Machinery
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Glossless surface of cross-linked polyethylene extruded products (Variant: strengthened measures)
Fenómeno del problema
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.
Especially on the original basis, additional attention is needed, and this problem is more prominent and requires key attention.
Análisis de la causa
(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
(6) On the original basis, additional attention is needed: process parameter fluctuations or equipment state changes aggravate this problem
Solución
(1) Increase die temperature to the higher value within 170-220°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 170-220°C
(5) Select raw material grades with good gloss, control filler content
(6) And strengthen process monitoring; on the original basis, additional attention is needed, paying special attention to parameter stability
Conclusión clave
Surface glosslessness is caused by low die temperature or too fast cooling, and the die temperature needs to be increased and cooling slowed down.
Targeted preventive measures need to be taken in different production scenarios.
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