Our Air Knives are designed to deliver a uniform/laminar airflow from the outset. If this is not the case, there may be some soiling on the inside of the Air Knife. Please open and clean the Air Knife following the operating instructions.
For lengths of more than 18″, the air knife must be fed via multiple compressed air inputs (up to 6 inputs depending on the length) in order to ensure a uniform airflow. In the case of the PVDF Air Knife, the material can also cause changes in the homogeneity of the airflow.
A guide for restoring a uniform airflow is available here.