Extrusion & Post
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HDPE film wrinkles
Problem Phenomenon
Longitudinal wrinkles, transverse wrinkles or dead wrinkles that cannot be stretched out appear on the wound film surface.
Cause Analysis
Unlevel die head installation, misalignment of the collapsing frame and haul-off rollers, and unlevel nip rollers cause mechanical wrinkles; film bubble deformation and snaking, improper cooling, and inconstant winding tension are process causes.
Solution
①Correct the level and center alignment of the die head; ②adjust the opening angle of the collapsing frame and the level of the nip rollers; ③stabilize the film bubble and cooling; ④adjust the winding tension.; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Wrinkles come from two sources: mechanical and process; first correct the mechanical alignment, then adjust the process stability, and troubleshooting in this order is efficient.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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