Is Side Air Leakage Affecting the Accuracy of the Air Entrainment Model?

Download this paper! In web winding processes, a thin layer of air is entrianed into rolls.  This air reduces the interlayer pressure in the wound roll because the air acts like a sponge between adjacent web layers.  Models have limited predictive success in narrow-web winding, especially when a pressure roller is not used. During winding and after a roll is wound the air in the roll leaks out of the sidewalls through narrow gaps between the layers.  In this paper:

• A new winding model is developed that includes the effects of air entrained during winding and the subsequent air leakage trhough the sidewalls during and after winding.
  
• Some results of this model are presented, together with cmparisons to experimental results and predictions from other historical models.