Extrusion & Post
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Abnormal Coefficient of Friction of LDPE Film
Problem Phenomenon
If the film roll COF is too high, machine running is not smooth; if too low, stacks slip and collapse.
Cause Analysis
The blooming amount of slip agent (erucamide type) is affected by addition amount, film thickness and storage time; insufficient blooming gives high COF, excessive blooming gives too low COF and affects lamination.
Solution
①Adjust slip agent addition amount by application; ②control film thickness and storage aging; ③COF online/offline testing; ④select low-blooming systems for lamination applications.
Key Takeaway
COF relies on refined management of slip agent.
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