Processing Machinery
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Cross-linked polyethylene XLPE unstable crosslinking efficiency (Variant: strengthened measures)
Problem Phenomenon
The crosslinking degree of the same batch of XLPE products fluctuates greatly, and the crosslinking degree of various parts is inconsistent.
Uneven crosslinking affects product performance consistency, showing inconsistency in cable pressure resistance tests.
Especially on the original basis, additional attention is needed, and this problem is more prominent and requires key attention.
Cause Analysis
(1) Peroxide or crosslinking coagent unevenly distributed
(2) Crosslinking temperature distribution uneven
(3) Uneven product wall thickness causes differences in crosslinking degree at various parts
(4) Crosslinking time insufficient or unstable
(5) Raw material batch differences
(6) On the original basis, additional attention is needed: process parameter fluctuations or equipment state changes aggravate this problem
Solution
(1) Optimize the mixing process to ensure uniform distribution of crosslinking agent
(2) Ensure uniform temperature of the crosslinking oven or heating medium
(3) Control uniform product wall thickness, extend crosslinking time for thick-walled products
(4) Stabilize crosslinking process parameters (temperature ±2°C, time ±1min)
(5) Perform small-sample crosslinking degree test for each batch of raw material
(6) And strengthen process monitoring; on the original basis, additional attention is needed, paying special attention to parameter stability
Key Takeaway
Unstable crosslinking efficiency is caused by uneven coagent dispersion or process condition fluctuation, and needs to be solved from mixing and process stability.
Targeted preventive measures need to be taken in different production scenarios.
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