Material Drying
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Bubbles in the insulation layer of cross-linked polyethylene XLPE cables
Fenómeno del problema
Bubbles or pinholes appear in the XLPE cable insulation layer, affecting insulation performance and pressure resistance.
Bubbles may develop into electrical trees during cable use, causing breakdown.
Análisis de la causa
（1）The material moisture content is high, and the moisture vaporizes at high temperature
（2）The small molecular gases produced by peroxide decomposition are not discharged in time
（3）Poor extrusion plasticization causes gas entrainment
（4）Cooling too fast after cross-linking causes the gas to be unable to escape
（5）The screw venting section design is unreasonable
Solución
（1）Fully dry the raw material, with the moisture content controlled below 0.03%
（2）Improve the efficiency of the extrusion venting section and add venting channels
（3）Optimize the screw design to ensure sufficient plasticization and venting
（4）Appropriately extend the high-temperature holding time after cross-linking to vent gas
（5）Control the cooling rate, which should not be too fast
Conclusión clave
Bubbles in the cable insulation layer are caused by moisture and volatile gases, and need to be solved from raw '2079851475616104451 and the venting system.
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