Material Analysis
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Unstable cross-linking efficiency of cross-linked polyethylene XLPE
Problem Phenomenon
The cross-linking degree of the same batch of XLPE products fluctuates greatly, and the cross-linking degree of each part is inconsistent.
Uneven cross-linking affects the consistency of product performance and shows inconsistency in cable pressure resistance tests.
Cause Analysis
（1）The peroxide or cross-linking assistant is unevenly distributed
（2）The cross-linking temperature distribution is uneven
（3）The uneven product wall thickness causes differences in the cross-linking degree of each part
（4）The cross-linking time is insufficient or unstable
（5）Raw material batch differences
Solution
（1）Optimize the mixing process to ensure uniform distribution of the cross-linking agent
（2）Ensure uniform temperature of the cross-linking furnace or heating medium
（3）Control the product wall thickness to be uniform, and extend the cross-linking time for thick-walled products
（4）Stabilize the cross-linking process parameters (temperature ±2°C, time ±1min)
（5）Perform small-sample cross-linking degree tests on each batch of raw material
Key Takeaway
Unstable cross-linking efficiency is caused by uneven dispersion of assistants or fluctuations in process conditions, and needs to be solved from mixing and process stability.
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