Extrusion & Post
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LDPE Blown Film Wrinkling
Problem Phenomenon
The film wrinkles during winding, wrinkling occurs at the collapsing frame, and the roll surface is uneven
Cause Analysis
Wrinkling originates from the geometric mismatch between the film bubble and the collapsing frame: improper collapsing frame angle, film bubble size fluctuation, uneven nip roller pressure; film surface swing caused by the rotating die also causes wrinkling
Solution
① Match the collapsing frame angle with the film bubble size; ② uniform nip roller pressure; ③ reduce rotation speed to reduce film surface swing; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Blown film wrinkling is a geometric alignment problem; calibrate the collapsing frame, nip roller, and rotation speed in three places; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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