Extrusion & Post
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Wrinkles appearing in polyolefin plastomer blown films (Variant: Enhanced Measures)
Problembeschreibung
The film shows longitudinal wrinkles during hauling, affecting the flatness of the film and subsequent processing.
The wrinkles are more obvious after winding and, in severe cases, cause the film to be scrapped.
In particular, additional attention is needed on the original basis; this problem is more prominent and requires focused attention.
Ursachenanalyse
（1）The film thickness is uneven, and the thin parts shrink first, producing wrinkles
（2）The hauling roller pressure is uneven
（3）The angle of the herringbone plate is improper or the included angle is asymmetric
（4）The cooling line height is unstable
（5）Uneven cooling of various parts of the film causes different shrinkage
（6）On the original basis, additional attention is needed: fluctuations in process parameters or changes in equipment status have aggravated this problem
Lösung
（1）Adjust the die gap and air ring to ensure uniform film thickness
（2）Adjust the hauling roller pressure to ensure uniform clamping
（3）Adjust the herringbone plate angle to be symmetric, generally with an included angle of 30-45°
（4）Stabilize the cooling line height, with fluctuation not exceeding ±50mm
（5）Check the uniformity of air ring cooling, and replace with a high-efficiency air ring when necessary
（6）And strengthen process monitoring; on the original basis, additional attention is needed to pay special attention to parameter stability
Wichtigste Erkenntnis
Wrinkles are caused by uneven thickness or unbalanced hauling, and need to be solved from thickness control, hauling, and herringbone plate adjustment.
Targeted preventive measures need to be taken in different production scenarios.
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