Processing Machinery
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Cross-linked polyethylene XLPE product surface roughness (Variant: strengthened measures)
Fenómeno del problema
After crosslinking, the XLPE product surface is rough, with gel spots and pits appearing.
Surface roughness affects product appearance and electrical performance, and may affect breakdown strength in cable insulation layers.
Especially on the original basis, additional attention is needed, and this problem is more prominent and requires key attention.
Análisis de la causa
(1) Gel particles produced by pre-crosslinking mixed into the product
(2) Uneven peroxide dispersion causes local over-crosslinking
(3) Uneven cooling rate causes inconsistent surface shrinkage
(4) Improper die temperature causes poor surface quality
(5) Material contains water or low-molecular volatiles
(6) On the original basis, additional attention is needed: process parameter fluctuations or equipment state changes aggravate this problem
Solución
(1) Strictly control processing temperature to prevent pre-crosslinking (170-200°C)
(2) Ensure peroxide is fully dispersed, use masterbatch or grinding dispersion
(3) Control crosslinking cooling conditions uniformly
(4) Appropriately increase die temperature to improve surface quality
(5) Fully dry raw materials, control moisture content below 0.03%
(6) And strengthen process monitoring; on the original basis, additional attention is needed, paying special attention to parameter stability
Conclusión clave
Surface roughness is mainly caused by pre-crosslinked gel and uneven dispersion, and temperature needs to be strictly controlled and uniform coagent dispersion ensured.
Targeted preventive measures need to be taken in different production scenarios.
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