Extrusion & Post
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Wrinkles appearing in linear low-density polyethylene blown film
Problembeschreibung
Longitudinal wrinkles appear in the film during hauling, affecting film flatness and subsequent processing.
Wrinkles are more obvious after winding and, in severe cases, lead to film scrapping.
Ursachenanalyse
(1) Film thickness is uneven; thin areas shrink first, producing wrinkles
(2) Haul-off roller pressure is uneven
(3) The herringbone plate angle is improper or the included angles are asymmetric
(4) Cooling line height is unstable
(5) Uneven cooling of various parts of the film causes different shrinkage
Lösung
(1) Adjust the die gap and air ring to ensure uniform film thickness
(2) Adjust haul-off roller pressure to ensure uniform clamping
(3) Adjust the herringbone plate angles to be symmetric, generally with an included angle of 30-45°
(4) Stabilize cooling line height, with fluctuation not exceeding ±50mm
(5) Check air ring cooling uniformity, and replace with a high-efficiency air ring if necessary
Wichtigste Erkenntnis
Wrinkles are caused by uneven thickness or unbalanced hauling and need to be solved from thickness control, haul-off and herringbone plate adjustment.
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