Extrusion & Post
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Wrinkles appearing in linear low-density polyethylene blown film (variant: strengthened measures)
Fenómeno do problema
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.
Especially, additional attention is needed on top of the original basis; this problem is more prominent and requires focused attention.
Análise das causas
(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
(6) On top of the original basis, additional attention is needed as process parameter fluctuations or equipment condition changes aggravate this problem
Solução
(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
(6) And strengthen process monitoring; on top of the original basis, additional attention is needed to pay special attention to parameter stability
Conclusão principal
Wrinkles are caused by uneven thickness or unbalanced hauling and need to be solved from thickness control, haul-off and herringbone plate adjustment.
In different production scenarios, targeted preventive measures need to be taken.
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