Processing Machinery
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Cross-linked polyethylene XLPE product hot extension exceeding standard (Variant: strengthened measures)
Problem Phenomenon
In the XLPE product hot extension test, the elongation exceeds the limit of 175%.
Excessive hot extension indicates insufficient crosslinking degree or an incomplete crosslinking network, and products are prone to deformation at high temperatures.
Especially on the original basis, additional attention is needed, and this problem is more prominent and requires key attention.
Cause Analysis
(1) Insufficient crosslinking degree, crosslinking network density not enough
(2) Crosslinking temperature too low or time insufficient
(3) Peroxide dosage insufficient
(4) Silane crosslinking condensation incomplete
(5) Irradiation crosslinking dose not enough
(6) On the original basis, additional attention is needed: process parameter fluctuations or equipment state changes aggravate this problem
Solution
(1) Increase crosslinking agent dosage to the formulation optimized value
(2) Increase crosslinking temperature or extend crosslinking time
(3) Check catalyst activity and warm water crosslinking conditions
(4) Increase dose for irradiation crosslinking or perform post-treatment annealing
(5) Regularly test the hot extension index, establish quality control records
(6) And strengthen process monitoring; on the original basis, additional attention is needed, paying special attention to parameter stability
Key Takeaway
Excessive hot extension is a direct manifestation of insufficient crosslinking degree, and comprehensive adjustment is needed from crosslinking formulation and process parameters.
Targeted preventive measures need to be taken in different production scenarios.
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