Material Analysis
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Cross-linked polyethylene XLPE product surface roughness
Problem Phenomenon
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.
Cause Analysis
(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
Solution
(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%
Key Takeaway
Surface roughness is mainly caused by pre-crosslinked gel and uneven dispersion, and temperature needs to be strictly controlled and uniform coagent dispersion ensured.
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